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Full text of ‘IS 4240: Glossary of conveyors terms and definitions’ (courtesy of; see link above)

(Reaffirmed 1998)

IS: 4240- 1984

Indian Standard
1. Scope - Lays down installation and usage.
2. Terminology 2.0 For the purpose of tthis standard, the following definitions shall apply. over a considerable the definitions of terms commonly used in conveyor manufacture, trade,



m&stab/e Speed Motor - A motor whose speed range, but when once adjusted will remain practically !.2 Air LOCK a) When applied to gates or valves, indicates of air as well as of bulk materials.

may be varied gradually unaffected by load.


of closure

such as to prevent inlet

movement to outlet

b) When applied to feeders, indicates ability to transfer bulk materials from without ever presenting an open passage that would allow free flow of air. !.3 Allowable Stress - The permissible safety factor to the ultimate strength. Idverse operating conditions. !.4 Amplifier - A device imall input signal. which operating Allowable

stress determined by the application of a suitable stress will be reduced for shock loads and other large power output signal proportional to a


a relatively

!.5 Amplitude - The distance from the mean position to the point of maximum displacement. In he case of a vibrating screen or vibrating conveyor with circular motion, amplitude would be the adius of the circle, In the case of straight-line or elliptical motion, it would be one-half of the najor axis of the ellipse, or one-half of the stroke. !.6 Anchors oundation. Bolts Bolts used for anchoring the conveyor to the flooi, pit and roof or other

1.7 Angle of Inclination .8 Angle of Repose pile.

- See 2.39%. That angle to the horizontal which a material will assume naturally when in

.9 Angie of Slide - That angle at which material will slide on an inclined surface y the nature of the material and the kind of surface on which it is supported. .lO Angle ofWrap - The angular alculating the power requirement .11 Antibackup See 2.26. a declining treated conveyor or prepared to chain and prevent to give wrap in degrees of a belt around of driving pulleys ( see Fig. 1 ). a pulley.

as determined

The term

is used in

.12 Antirunaway - A safety device to stop le event of a mechanical or electrical failure. .I3 Antislip ,action. Surface A surface especially

its running greater

away in

than normal one to

.14 Apron - A series of apron pans which, when attached nother, forms the conveying medium for an apron conveyor. 2.14.1 Apron Flight See 2.14.2.

or pivotally


Adopted 30 July1984 I

C!J March 1987, ISI


Price Rs 7OmOO


�IS:4240 -1984

FIG. 1




2.14.2 Apron Pan - One of the series of overlapping or interlocking together with others, form the conveyor bed (see ).


or shapes which, Beaded and curved apron pan - An apron pan having a segment of a cylindrical bead along one edge with a formed curve at the other edge which overlaps the bead along the edge of the adjacent pan. Double beaded apron pan - An apron pan having a bead along each edge, one being of larger redius than the other so that adjacent pans are interlocked by the larger bead over!apping the smaller. Apron pan end - A plate which is attached normal to the carrying'surface to prevent spillage. *Hinged apron pan each edge so that it may be joined or formed at each end of the apron pan along overlaps

An apron pan which is made with a hinge construction to companion pans by a hinge pin or through rod. An apron pan having An apron a bead along one edge which filter block bolted Single beaded apron pan the plain edge of the adjacent pan. Wood-filled apron pan the shock of loading heavy materials. 2.14.3 Armoured 2.14.4 Hinged apron An apron See 2.163.2.

pan with a wooden

in to absorb

in which

each pan is provided

with a separate



Apron -

2.15 Arching - The bridging of material between the sides of a bin, chute, certain conditions whereby flow from the containing unit ceases. 2.16 Assembly Table See 2.163.6 to trolley


or bunker under

2.17 Aftachmenf - On a trolley conveyor, a part assembled supporting or moving the objects being conveyed. 2.17.1 Bolt attachmenf Joad bar or various objects. A trolley attachment having

or chain

for the purpose for attaching

of a

a threaded

rod projection

2.17.2 Chain atfachment - That adjunct of the chain carrying medium or to that component which is propelled. 2.17.3 Clevis affachment loads from a trolley conveyor




to connect

it to the loadlight

A forged chain pin with a clevis chain between trolleys. 2

on one end used for supporting

�IS: 4240 - 1984
2.11.4 Dummy attachment See 2.17.6. The parts assembled An attachment used to the flights to complete that are used to connect assembly of them to

2.17.5 Flight attachments the conveyor chain or chains. 2.17.6 Idler trolley. attachment -

a non-load-carrying

2.17.7 lntermediafe


See 2.17.2.

2.17.6 Pendant attachment ( as opposed to the double

projecting down through the chain - A single bar trolley attachment or clevis type ) having a single hole for supporting various objects.

which are used for rotating objects carried on a 2.17.9 Swivel attachment - Of various designs conveyor. They may be indexed at 90" or 180" and are usually suspended from a clevis attachment ( see a/so 2.687.10).

2.18 Attrition - The act of wearing changes, change of moisture content, 2.19 Auger See 2.525.1.

or grinding by abrasion, or by other influences.




2.20 Automatic other conveyor

lubricator - A device used components as they pass.

to automatically


the chain,


wheels units

or and

live-storage 2.21 Automatic Order Packing - A system of feeding conveyors, collecting conveyors which may be punch card or computer controlled.


2.22 Automatic Power Shovel - Usually an electric driven mechanism to provide power to a manually handled shovel or scoop, automatically disengaging when shovel reaches car door and engages Principally used to unload grain or other free flowing when operator gives slack to the shovel rope. material from box car. of production, 2.23 Automation - A system or method in which many or all of the operations movement and inspection of parts and materials are automatically controlled or performed by self-operating machinery, electronic devices, etc. 2.24 Ax/e - A shaft, either wheels of a car or carriage. 2.25 Backing a) In pillow blocks, motors, speed reducers, and centre of the shaft to the mounting surface. b) In miter or bevel gears, the on the side opposite the teeth. c) In bolt idlers, 2.28 Backstop action of gravity the distance distance from other similar circle objects, the distance from the the hub rotating or nonrotating, on which are mounted the driving or supported

the pitch

plane to the face of surface. conveyor or elevator

from the horizontal

roll to the mounting reversal of loaded Of a wheel

A mechanical when forward backstop -

device to prevent travel is interrupted.

under The

2.28.1 Band brake

A type Of backstop Consisting

and a brake


two ends of the band are attached to a cam linkage in such a way that the friction between ihe brake wheel and the band actuates the linkage to increase the perimeter of the band when opsrat_ ing in the forward direction and to decrease the perimeter in reverse direction, The brake band grips the wheel to prevent reverse rotation ( see Fig. 2 ).



�IS :4240 - 1984
2.27 Backup Bar - A metal bar used to backup the chain of a caterpillar chain dogs in proper contact with the conveyor chain. 2.28 Baffre See 2.201. Any scale especially designed or adapted for weighing materials during a drive to hold the drive

2.29 Bagging Scale bagging operation.

2.30 Bail - A yoke or pivoted a single point of support. 2.31 Bale



to span a conveyor

frame or skip bucket and


a) Compressible articles or materials assembled in a shaped unit and bound with cord or metal ties under tension ( A bundle is formed without compression ); b) A fibre container, c) For some products securely bound by metal such straps, rope or wire; and `bale' represents objects a specific quantity. in any

or materials,

as, cotton,

2.32 Ball Tab/edirection.

A group of ball transfers device in which

over which a larger

flat surfaced

may be moved

2.33 Ball Transfer - A face of smaller balls.

ball is mounted waist-high,

and retained

on a hemispherical walk

2.34 Balustrade - A wall or structure, or stairway for safety of passengers. 2.35 Barn Cleaner 2.36 Base P/ate 2.37 Basket Carrier 2.38 Batching proportioning See 2.163.9. attached



each side of a moving

A plate -

to a structure

or machine

to provide


on its foundation.

See 2.118. apparatus for storing, withdrawing amounts and of

of material handling Plant - A combination various materials in predetermined lots. A scale fitted with a hopper in total making up a batch.

2.39 Batching Scale one or more materials, 2.40 Bead -

for the accumulation pan concentric

of selective

A cylindrical

segment along the edge of an apron

with the pivot point. for the

the flange of supporting beams or trusses 2.41 Beam Clamp - A device for gripping purpose of suspending from same a structure such as a conveyor frame or track. 2.42 Bearing - A machine oscillates or slides. 2.42.1 Antifriction 2.42.2 Babitted 2.42.3 Babitted 2.42.4 Journal bearing bearing part in or on which A bearing using a journal, rolling shaft elements metal. end, axle, pin or other such as balls, rollers,

part rotates, or needles.

A bearing


of babbitt

flanged bearing bearing -

See 2.43.1.

See 2.42. A bearing of tubular construction a one-piece ( See also 2.42.2 and 2.442.7 ). bearing block. consisting of two main parts

2.42.5 Sleeve bearing 2.42.6 So/id journal

bearing -

A bearing


2.42.7 Split journal bearing - A bearing having parted or split at the centreline of the shaft. 2.42.8 Step bearing - A bearing port that shaft and any components be incorporated in the design. 2.43 Bearing Block -

a block or housing

mounted at the lower end of a vertical shaft and used to supmounted upon it. Radial support for the end of the shaft may which contains 4 or supports a bearing.

The block or housing

2.43.1Babbiffed ( see Fig. 3 ). flanged bearing block A flanged bearing block having a babbitted

- 1984







2.43.2 Flanged bearing the axis of the shaft.

block -

A bearing A bearing

block having with a housing

a mounting having


in a plane for



2.43.3 Takeup bearing block takeup frame ( see a/so 2.609). 2.44 Bearing Box See 2.43.



in the

2.45 Bearing Slop - A member fastened to fix the position of a bearing. 2.46 Bed a) That part of a conveyor conveyed. b) In bulk material 2.47 Bed Plate 2.46 Bell Mouth 2.49 Belt -

to the bearing



to prevent



upon which

the load or carrying


rests or slides




the mass of a material

being conveyed. machinery.

A supporting See 2.348.


or plate for mounting

See 2.49.1to 2.49.16. belt - A conveyor belt which has been protected of the cover by sharp objects being handled. by metal strips to belt prevent which buckets

2.49.1Armoured gouging or tearing

it is that portion 2.49.2 Base belt - In a closed belt conveyor remains flat and provides the necessary tensile strength. 2.49.3 Bucket are attached. elevator belt A belt fabricated for bucket elevator

of a type of closed use to which


2.49.4 Cable-selvage belt - A belt in which the carrying section is composed of rubber and fabric with attached intermittent transverse metal supports having both ends supported by cables. The cables transmit the driving force and the centre portion functions as the load-supporting medium. 2.49.5 Carrying belt - That portion discharge point ( See a/SO 2.509.1 1. of the belt which carries the load between the loading and

2.49.6 Chain selvage belt - A belt in which the carrying section may be made up of rubber or fabric, woven metal, or other material and along each edge of which is fastened an endless chain with a suitable attachment. The chains carry the driving tension. The centre part functions only as a load supporting medium. to stabilize 2.49.7 Cleated belt - A belt having raised sections spaced uniformly Cleats may be a part of the belt or fastened on. on belts operating on inclines. 2.49.8 Conveyor belt - A belt to carry materials toad being conveyed ( See to ). and transmit the power flow of material


to move the

See Bottom Cover; Breaker; Carcass; Compound; For terms applying to conveyor belts, Cover; Cover Quality; Duck; Friction: Maximum Belt Plies; Pitch; Ply Adhesion; Ply Arrangement; Ply Tensile; Bag Belt Tension; Skim Coat; Slack Side Belt Tension; Slip; Starting Belt Tension; Step Pad; Step Ply; Takeup Belt Tension; Tight Side Belt Tension; Top Cover; and Transcord Breaker. 5

�IS : 4249 - 1984 Cord conveyor be/f - A rubber conveyor belt in which the carcass is composed of single ply, or multiple plies of cotton or synthetic cords acting as longitudinal tension-carrying members in combination with plies of fabric to provide transverse strength and hold the cords together. Fiat lateral, rectangular provide articulation having wire conveyor belt - A belt composed of flat metal strips formed in a series of loops held together by lateral wires passing through holes in the flat strips to similar to a conveyor chain and arranged to be driven by sprockets. A construction of conveyor belt similar to that it is impossible to separate the plies. and lnferwoven conveyor belt the plies interwoven to the extent Rubber conveyor belt - A conveyor belt consisting of a central stress-bearing carcass for transmitting power enclosed in rubber covers to protect the carcass from abrasion and atmospheric changes. The carcass usually consists of plies of cotton duck fabric, but other constructions used are cotton cords, steel cables, woven fabrics of synthetic fibres such as rayon, nylon, orlon, dacron, glass and asbestos. The rubber covers are furnished in various thickness and qualities of rubber compounds. Solid of fabrics woven woven into the belt coating treatments woven conveyorlbelt - A construction of conveyor belt consisting of multiple plies into one piece, which is done on looms designed for this purpose. Stripes are to show the numbers of plies, which range from two to ten. Impregnating and are frequently employed. of a two of Steel cable conveyor belt - A conveyor belt in which the carcass is composed single place of steel cables which acts as a longitudinal tension-carrying member and includes or more plies of fabric to provide transverse strength and hold the cables together. cotton Stitched fabric stitched canvas conveyor belt - A construction OF conveyor together. Stitched canvas belts may be untreated, conveyor belt coils of wire belt made up of plies impregnated or coated. Wire mesh tions of flattened-helical members.

A woven wire conveyor belt composed of various combinawhich may or may not be joined by straight or crimped

of a series of formed wires Woven wire conveyor belt - A flexible belt composed laterally connected, or of longitudinally articulated wires laterally connected for operation over Sometimes chain are attached to the edges of the wire mesh and, by means straight face pulleys. of sprockets attached to the pulley shafts, provide positive belt motion. 2.49.9 Drive belt A belt which is used to transmit power or motion from one part to another. the width of which is

belt of approximately 2.49.10 Flat belt -A considerably greater than its thickness. 2.49.11Hinged belt See 2.14.



of two strands of endless chain connec2.49.12Link-plate belt - A grizzly type of belt consisting ted by through rods at each articulation on which are carried a series of plates or bars mounted in a vertical plane for the purpose of rough screening while conveying. 2.49.13 Return belt The belt on the strand or run returning to the loading or stainless point. alloyed and

2.49.14 Steel band be/f - A belt of relatively thin carbon heat treated to withstand continued flexing over p.ulleys. 2.49.15 Thrower 2.49.16 permitting V-be/f wedging belt A belt contact 2.385.2.1 and 2.622.1.

strip steel

having a trapezoidal cross-section for operation in grooved between belt sides and groove sides for power transmission.


belt. May comprise of single 2.50 Belt carcass - The tension carrying portion of the conveyor or multiple plies of fabric, cord, or steel cable bonded together with rubber or other material. equipment the purpose of which is 2.51 Belt Cleaner - Auxiliary which clings to the conveyor belt ( See also 2.51.1,2.90 and 2.552 ). to clean or remove material

spaced about 2.51.1 Rotary belt cleaner - A series of straight or spiral blades Symmetrically the axis of rotation and caused to scrap or beat against the belt for the purpose of cleaning ( see Fig. 4 ) ( See also 2.90 1. 6

�IS : 4240 - 1984




2.52 Belt C/eat


See 2.146. See 2.267. properties of rubber compound used in manufacture of conveyor belt.

2.53 Belt Friction

2.54 Be/tGrade - Physical 2.55 Belt Housing 2.56 Belt Idler -

See 2.260. See 2.263.2 See 2.49.12. The lateral movement of a conveyor belt to either side of its intended and 2.591.


2.57 Belt Link Plate 2.56 Be/t Misalignment path. 2.59 Belt Pitch 2.60 Belt Ply Line

See 2.445.

See 2.449. above and around the conveyor belt

2.61 Be/t Retainer - A strip, rod, bar or similar item mounted to prevent the belt from being blown off by high winds. 2.62 Belt Scraper 2.63 Belt Slip See 2.522.

See 2.566. a belt conveyor so arranged as to provide
working space

2.64 Be/t Tab/e - A table incorporating on one or both sides of the belt.

2.65 Be/t Turnover - A system of bend pulleys arranged to turn the belt over. prevent build up on return idlers by turning the dirty side ( carrying side ) up. 2.66 Belt Wiper 2.67 Bend Shaft See 2.522. A shaft which frame supports a bend wheel or pulley. a gallery or conveyor




2.68 Bent - A transverse ( See a/so 2.283.1 ). 2.69 Bin A container for

used to support

frame at a fixed




2.70 Bin Gate ( Also known as Bin Valve ) - A device for complete shut-off or control of gravity impelled flow of materials from a bin, bunker, hopper or other container, May be hand or poweroperated and if powered can be arranged for automatic operation ( See a/so 2.704, 2.795, 2290.12, 2.292.6, 2.292.11, 2292.14,, 2.292.15,, and 2.292.21 ), 2.70.1Air lock bin valve - A type Of Vabte used to control free-flowing materials which may have The flow Of material is interrupted at two points and provides an air chamber become aerated. between the two seals when closed. 2.762 Cut off bin gate See 2292.12.


2.70.3 Flexible tube bin valve - Valve consisting of a flexible, non-metallic tube secured at the upper end in a fixed position at the bottom of the bin and secured at the lower end to a rotating ring which twists the tube until complete closure is obtained.

2.70.4 Multiple bin gate - A series of bin be opened and closed simultaneously.

gates connected

to single


device so that






2.70.5 Rolling apron bin gate - A gate in which the flow controlling medium consists of an endless belt supported on closely spaced rollers which substitutes rolling effort for sliding effort while being opened or closed. In principle, it operates similarly to an inverted crawler tread. 2.70.6 Rotary vane bin valve - A type of valve or gate in which radially spaced vanes form pockets or containers for a measured amount of material in each pocket which can be discharged as a batch or a series of batches. Usually power-operated but can be operated manually ( See also 2.260.48 ), 2.70.7 Segmental 2.70.8 Undercut bin gate bin valve See 2.292.14. See 2.292.21.

electrical or electronic device used to indicate the pre2.71 Bin Level Indicator - A mechanical, sence or absence of bulk materials at a predetermined location or elevation. Indication may take the form of audible or visible signals or a sequence of events may be initiated such as starting and stopping conveyors or feeders. 2.72 Blanking conveyor. P/ate An adjustable detachable plate used for restricting the loading of a

2.73 B/ending Sysfem -A of blending bulk materials determined proportions. 2.73.1 Blending 2.73.2 Blending 2.73.3 Blending 2.73.4 Blending 2.74 Blinding the apertures 2.75 Bolster incorporating conveyor. -

coordinated system of conveyors and allied equipment for the purpose to obtain a product which will be uniform and homogeneous in pre_ See 2.483. conveyor See 2.590. conveyor See 2.163.134. particles coat or cement over See 2.183.110.

system reclaimer system reclaiming system stacker system stocking

- In screen terminology, of the screening surface. A pad or support pivet and/or hinge

a condition where undersize Also known as plugging.

plate used to anchor the features to peimit vertical

tail end of a conveyor and usually and/or horizontal rotation of the that support or contains the

2.76 Boom - A cantilevered or component parts of a conveyor. 2.77 Boot The casing

overhanging member or structure May be fixed, hinged or pivoted. terminal of a bucket elevator. of an elevator

for the loading

2.78 Boot P/ate 2.79 Boot Shaft -

The curved See 2.281. Unit -

plate forming

the bottom

boot (See a/so 2.82 ).

2.80 Bottle Lowering within spiral guides.







are lowered

at a controlled side of the

speed belt,

layer over the carcass on the non-carrying 2.81 Bottom Cover - The elastomeric ( See ). usually of the same material as the top cover 2.62 Bottom also 2.78 ). P/ateA flat plate closing the bottom of a bucket elevator casing



( See

2.83 Box End 2.84 Bracing -

See 2.657. Diagonal or horizontal members used to stabilize conveyor supporting structures.

2.85 Brake - A friction device for slowing down conveyor components for bringing conveying equipment to a controlled stop; for holding travelling or transversing equipment in a selected location; for preventing reverse travel; and for controlling overspeed due to action of gravity. 2.85.1 Band brake See 2.28 and 2.28.1. a motor shaft with means to engage

brake usually mounted on 2.85.2 Magnetic brake -A automatically when the electric current is cut off or fails. 8

�IS: 4240 - 1984
2.86 Breakaway See 2.592.

cover and the 2.87 Breaker - A layer of open mesh or cord fabric placed between the elastomeric The breaker may be provided at the edges also, outer ply or embedded in the elastomeric cover. ( See also and 2.87.1 ). Types of breakers are open weaves of cotton, rayon and nylon 2.87.1 Transcord breaker - A breaker comprised of cord fabric or running laterally across the conveyor belt between top cover and carcass. than one ply and also set on the diagonal. 2.88 Breaker 2.89 Brush, Strip See 2.87. individual cords usually This may also be more

Belt Conveyor -- See 2.51.1and 2.90. backing used for cleaning a

2.90 Brush Cleaner - A device consisting of bristles set in suitable ( See a/so 2.51.1). conveyor belt. It is usually of the rotary type 2.91 Bucket -See 2.91.1to 2.91.13. generally

2.91.1Bottom discharge conveyor bucket - A vessel and having a bottom consisting of an undercut gate. 2.91.2 Centrifugal boot of an elevator






discharge elevator bucket -- A bucket and discharge by reason of the combined

designed to scoop effect of centrifugal

material from the forceand gravity.

2.91.3 Continuous elevator continuous bucket elevator. continuous buckets having plates ( see Fig. 5).

bucket - A bucket designed for complete discharge when used in a High front, medium front, and low front are terms used to designate a relatively large or small included angle between the front and back



BUCKET Continuous elevator bucket, overlapping - A continuous bucket the depth of which is greater than the spacing of the buckets on chain or belt, thus providing an overlap on the straight runs. The back of the bucket at the discharge end fits between the flanges on the front of the preceding bucket. 2.91.4Nevator bucket - A bucket generally rectangilar in plan and shaped for attachment to a chain or belt and a bottom or front designed material as the bucket passes over the head wheel of a bucket elevator. 2.91.5, 2.91.9, 2.91.11, 2.91.12and 2.91.13 ). 2.91.5 Gravity discharge conveyor/elevator material on vertical lifts and scrap material ed by gravity. 2.91.6High front elevator elevator front bucket bucket having a back suitably to permit discharge of ( Seealso 2.91.2,2.91.3,

bucket - An elevator bucket designed to contain along a trough on horizontal runs. Discharge is effect-

See 2.91.3. See 2.91.3. See 2.91.3. bucket bucket carried on, and free to pivot about trunnions conveyed or

2.91.7Low front 2.91.8Medium


bucket conveyor tube or

2.91.9Pivoted bucket - A crossrods carried by chains. 2.91.10Skip hoist. bucket The

used for containing

the material

by a skip

2.91.11Super-capacity elevator bucket - A type of continuous elevator bucket used with a pair of chains in which the back of the bucket at the bottom extends backwards into space between the up and down runs to provide additional capacity without increase in length or projection,

�IS : 4240 - 1984
2.91.12 front

V-elevator bucket - A form of gravity discharge conveyor-elevator and back make the same angle with the vertical centre line.
elevator bucket An elevator


in which

the of

2.91.13 Vented trapped air. 2.92 Bucket 2.93 Bucket 2.94 2.95 2.96 2.97 2.98 2.99 Bucket Bucket Bucket Bucket Bucket Bucket Dumper Elevator Elevator Elevator Elevator Elevator, Guides Leveler

bucket with holes or slots to permit

the escape

See 2.651.4. 2.77 and 2.120. See 2.78 and 2.82. 2.77 and 2.120. and 2.318.

Boot -See Boot Plate Boot Head See

See 2.121 -

Pivoted -


See 2.307. See 2.650.1. A device Clips or for restoring on an the buckets elevator of a pivoted bucket conveyor to the of

2.100 Bucket Righter carrying position. 2.101 Bucket Wing parallel chains. 2.102 Build components


bucket for attaching

to double


Up - That material which of the conveying system.

clings to the conveying medium Also known as `encrustation'.

or accumulates

on various

2.103 Bumper - A guard or pad attached to conveyors cars or carriers to prevent damage on contact with one another ; a guard or pad attached to a fixed conveyor structure or to a car to prevent damage when the moving car contacts the structure. 2.103.1 conveyor powering means is Accumulating bumper - A bumper on a power-and-free conveyor carrier or in-floor tow cart which incorporates a control mechanism to disengage the carrier or cart from the means. Disengagement occurs when the bumper contacts a fixed object. The powering automatically reengaged when the object Is removed. A device on a tow conveyor chain in the event of collusion for the storage truck, dolly, or cart which disconnects with another truck, trolley, cart or (See a/so 2.69).

2.103.2 Truck safety bumper the tow pin from the propelling other obstruction. 2.104 Bunker 2.105 Bushing a) ln machinery, b) /n chain, improved -

A large bin or compartment

of bulk materials

a removable

liner fixed in a bore to improve fixed in the barrel of a link,

the bearing or centre

surface. link, to provide surface an for

renewable liner bearing surface.

c) /n chain, a hollow cylinder used to space the side bars and provide the chain pin, and on which rollers may or may not be mounted. 2.106 By-Pass of material. -A device, usually a gate, for the purpose of changing

a bearing

the usual


of travel

2.107 Cable Reel entry fitting and used to supply springs or motor

- A metal drum with rim equipped with springs or electric motor, slip rings, cable electric cable wound about the drum face in one or more layers. This device is power or control current from a fixed supply to a moving machine. The cable reel are used to maintain tension on the cable during the pay-out or reel-in cycle. or rope supported system in which the carriers are not detached The travel of the carriers is wholly within the span. the supporting from

2.106 Cableway - A cable the operating mechanism.

system in which 2.108.1 Slack line cableway - A cable or rope-supported is adjusted in length to provide the lifting function of the unit. 10



- 1984

A rotating disc or sliding piece having varying radii or projection so as to impart to a 2.109 CamThe disc, piece or projection contacting member, variable velocity or variable motion as required. may rotate, progress or reciprocate as desired at any predetermined rate. 2.110 Cam Shaft A shaft on which a cam is mounted or of which a cam is an integral part. by a

that can 2.111 Capacify - The number of pieces, volume or mass of material conveyor in a unit of time when operating at a given speed ( See also 2.478 ). 2.112 Capsian powered. A concave cylinder for rope or cable snubbing purposes.

be handled

May be an idler or Generally

carrier that receives and supports the load to be conveyed, 2.113 Car - A wheeled attached to Cabin, belt, cable linkage or other propelling medium ( See also 2.646 ).

2.113.1 Transfercar - Any wheeled device used for transferring loads from one conveyor another. May be manually or automatically operated ( see Fig. 6 ).






2.114 Car haul - A pusher chain conveyor used for moving track. A form of tow conveyor ( see ). 2.114.1 Car haul pushing dog 2.114.2Car haul safetydog 2.114.3Car haul spur 2.114.4 Car haul tilting See 2.471, See 2.329.


cars, such as mine cars,



See 2.471. dog See 2.624.

It may be comprised of single 2.115 Carcass - The tension bearing portion of the conveyor belt. or multiple plies of fabric or cord of solid wooven type or single layer of steel cords elastomeric material ( See also ). 2.116 Carpet 2.117 Carriage 2.118 Carrier a) A device of various b) The receptacle system. types attached objects to or hung from trolleys are placed for to support the load. a pneumatic tube See 2.164. See 2.661.

in which



2.119 Casing - A structure of wood, metal or other material which completely encloses the elevating or conveying machinery elements to support them, to afford safety protection, to protect from the weather, or to confine dust, gases or fumes arising from the material being conveyed; or to form a part of the conveyor in the same manner as a trough ( See a/so 2.119.2). 2.119.1Boot elevator casing See 2.120. with sealing washers or glands to keep out

usually fitted 2.119.2Chain casing - An enclosure foreign material and prevent the escape of lubricant.


�Es : 4240 - 1384
2.119.3 Gear lubricant. casing An enclosure around a gear train, generally constructed so as to retain

hollow column supporting 2.119.4 Self-supporting casing -- A casing designed as a continuous the weight of the complete elevator and requiring only lateral ties to adjacent structures. 2.120 Casing Boot Section 2.121 Casing Head Section conveyor. 2. I22 Casing Hood 2.123 Casing both. The casing The or housing of casing for the loading at the head terminal end of of a bucket elevator. a bucket head terminal. or the corner providing easy sections or elevator or


That portion Section

of the casing The

head end that encloses:the between swivel the terminal casters



2.124 Caster Bed ( Caster Table ) of flat surfaced objects. 2.125 Caster Track See 2.629.

A group

of inverted


2.126 Caterpillar Chain Dog - A dog or tooth driving contact with the conveyor chain. 2.127 Cellar Hoist See 2.163.4.


to a caterpillar

drive chain to provide


group of terminals in pneumatic tube systems where carriers are 2.126 Central Desk - The main manually relayed from one line to another or where material in the carriers is processed or where both these actions take place. 2.129 Centre Column - A column to which the spiral chute bed is attached and supported or in the case of an open centre chute, the column to which brackets are attached to support the bed. 2.130 Centring Table See 2.552.

measured along the carrying run of a conveyor from the centre of 2.131 Centres - The distance one terminal wheel or pulley to the centre of the opposite terminal wheel or pulley; also, horizontal centres or vertical centres, the distance from the centre of one terminal or bend wheel to the centre of another one as projected on a horizontal or vertical plane. joined together to form a medium 2.132 Chain - A series of links pivotally transmitting motion or power. General classes of chains common to the conveyor in 2.132.1 to 2.132.47. for conveying or art are covered

side bar chain having a barrel-less centre link. In some 2.132.1 Bar link chain - A straight forms the entre link is made from two side bars, with or without a spacer washer, and in others the centre link is solid ( See Fig. 7 1.

FIG. 7



2.132.2 Block chain 2.132.3 Bushed chain 2.132.4 Bushed pint/e ( see Fig. 8 1.

See 2.132.1 and 2.132.9. See 2.132.37. A type of pintle See 2.132.36. with cast rollers. Used chiefly for apron, pan, scraper chain having a bushing in the barrel of the link

chain -

2.132.5 Bushed roller chain 2.132.6 Cast roller chain flight, and slat conveyors.

A cast chain

endless 2.132.7 Caterpillar chain - A short with and move or be moved by a conveyor chain.

chain on which

dogs or teeth are spaced to mesh


�IS : 4240 - 1984

FIG. 8 BUSHED PINTEL CHAIN 2.132.8 Coil chain - A chain having links of round or flat bar steel formed interlocking as the chain is manufactured. into loops and made

side bar chain consisting of alternately 2.132.9 Combination chain - A straight ,centre links and flat steel side bars connected by means of chain pins ( see Fig. 9).



FIG. 9 COMBINATION 2.132.10Conveyor chain A chain

CHAIN medium of conveyors,

used in the conveying

in which 2.132.11Cottered chain - Any chain holes normal to their axis for the insertion of COtterS

one or both ends of the pins are provided with or pins to hold the parts of a chain together.

having 2.132.12 Detachable chain - A chain in which each link is of single piece construction, the pin, side bars and barrel of book shape COnStrUCtiOn Cast or formal integral ( See Fig. 10 ). The links of this type chain may be coupled or uncoupled after rotation out of normal operating position.

FIG. 10 DETACHABLE 2.132.13Detachable type chain without damage to the parts. Any chain in

TYPE CHAIN which the links may be separated or joined

2.132.14Double pitch chain - A roller chain using the same joint members as standard chain and having the same dimensions except for the pitch which is twice standard. 2.132.15Drive chain A chain used in a chain drive for transmitting power.



�IS : 4240 - 1984
2.132.19 Finished roller chain See 2.132.47.

2.132.17 Flat top chain -

See 2.132.18. A chain made up of links having a hinge type joint and having to the plane of the axis of the pins ( see Fig. 11 ).

2.132.18 Hinge joint type chain a flat top surface in a plane parallel



2.132.19 Hog scraper chain 2.132.20 /ce chain -A

An old term for a type of bar link chain. chain. bosses extendthe pin to provide

type of bar link

2.132.21 Intermediate carrier chain - A form of pintle chain having cylindrical ing outwardly from the side bars at the open end of the link and encircling driving lugs for double or twin sprocket wheels. chain. having series 2.13222 Inverted tooth chain - A drive assembled either with pins and/or other joint components to provide pitches ( see Fig. 12 ) ( a/so known as `Silent Chain' ).

of toothed links alternately a pivot between adjoining





2.132.23 Knuckle joint chain - A form of rivetless chain with a special link, usually at a trolley that provides a pivot so that the chain can be flexed at greater angles vertically allowing it to transverse shorter radius vertical curves. 2.132.24 leaf chain See 2.132.1. chain more See 2.132.38. strands having of the more same chain of practically laterally the same,

2.132.25 Long pitch engineering

2.132.26 Matched chains - Two or length and attachment spacing. 2.132.27 Multiple by a common pin. width chain -

A chain A chain

than one row of links offset links.


2.132.28 Offset side bar chain -

made up of consecutive in which

2.132.29 Pint/e chain - A type of offset chain between a pair of offset side bars ( see Fig. 13 ).

the barrel

is cast


at one end




2.132.30 Pocket chain 2.132.31 Precision See 2.132.8. See 2.132.47. swaged or in the centre

roller chain -

2.132.32 Riveted chain riveted so that chain cannot

A chain in which the ends of the pins are headed and/or be disassembled without cutting off the pin.

2.132.33 Rivetless chain - A straight side-bar chain having a double headed pin locked outside side bars and which engages the live bearing seats inside the ends of a loop-shaped link ( see Fig. 14 ).

FIG. 14 RIVETLESS CHAIN 2.132.34 Roller chain - A chain ( see also 2.132.38 and 2.132.47 ).

having a roller


the barrel

or bushing

of each link


2.132.35 Silent chain 2.132.38 Single width

See 2.13222. chain A chain having one row of links. all steel chain made up of either succes. finks with bushing barrels and outside

2.132.37 Steel side bar bushed chain - A fabricated sive offset links with bushing barrels or alternate centre links connected by means of chain pins ( see Fig. 15 ).


2.132.38 Steel side bar bushed roller chain - A fabricated provided with rollers which revolve on the bushing. 2.132.39 Steel thimble 2.132.40 Straight 2.132.41 Straight roller chain See 2.132.38.

all steel roller

chain of the bushed type

link chain -

See 2.132.41. A chain made of alternating centre and outside links.

side bar chain -- See 2.132.37.

2.132.42 Stud chain

2.132.43 Switch chain carrier through a switch. by the main conveyor.

An endless The chain

chain confined to a path within a switch may be driven from an independent source pintle chain having joints which permit conveyor

to power load or slave driven of the chain

2.132.44 Swivel chain - A special in any ( more than one ) plane. 2.132.45 Test chain 2.132.46 Transfer chain chain, A chain

flexure scales,



for calibrating

a) A type of pintle objects;

the upper surface

of which

is variously


to suitably



�IS : 4240 - 1984
b) A chain which moves carriers and-free conveyor; and c) A chain for advancing trucks through a switch from one power line to another in a power--

from one loop into another

in a tow conveyor. to relatively close

2.132.47 Transmission roller chain -Type of steel roller chain manufactured clearances and tolerances and with highly finished surfaces ( see Fig. 16 ).




2.132.48 Twin rail chain or cable conveyor, power and free - Overhead chain conveyor with pusher dogs attached to an endless chain or cable driving load-carrying trolleys running on a separate track. Propelling medium and trolleys are not connected. The trolleys can be diverted away from the driving chain by means of switches. The conveyors may be designed for threedimensional travel. ( See Fig. 17 ).











2.133 Chain Barrel - That portion of a cast chain I ink that joins and is between the side bars at the pivot point, the inside of which forms the live bea ring seat for the pin and the outside of which provides the contact surface for or with the wheel. 2.134 Chain Guides See 2.307. parts that form the pivoting portion of the chain ( pins, bushings, barrels

2.135 Chain Joint and rollers ). 2.138 Chain 2.137 2.138 Chain Chassis Pitch Pull, -


See 2.445, See 2.338.

Effective See 2.881.

2.139 Choke Food - A feeding arrangement in which the potential rate of supplying feed point exceeds the rate at which the conveyor will remove material. 2.140 Chufe - A trough through which bulk materials or objects gravity. The trough may be straight or curved, open or enclosed. 2.140.1 Bifurcated chute a deflector plate to control are directed


at the by

and lowered fitted

- A chute which separates into two branches. It is usually the delivery of material to either or both branches. A spiral chute having as the inside guard. used to receive a centre and core or column material

with it a

2.140.2 Core type spiral chute is fabricated, with the core serving 2.140.3 Discharge conveyor. chute A


which from



or objects


�IS : 4240 - 1984 divider member resulting in two chutes 2.1404 Double chute - A chute having a longitudinal in one. The divider member can be arranged so that the chutes are side by side or one above the other. 2.140.5 Enclosed spiral chute A spiral chute with an integrally fabricated outer enclosure.

2.140.6 Gravity chute -

See 2.140.17. a bar material grizzly which separates the fine from the coarse

2.140.7 Grizzly chute - A chute with material as it passes through the chute. 2.140.8 Loading chute Used to direct

to a conveyor. having two or more super-imposed troughs or

2.140.9Multideck spiral chute beds fabricated into one assembly.

Any spiral


2.140.10 Nonsegregating chute - A chute, usually used to charge stoker hoppers, so designed as to deliver the coal in a mixed state rather than having the large lumps tending to separate from the fine. 2.140.11 One-way material chute A chute causing one fixed direction of discharge a centre with or trajectory of Side

2.140.12 Open centre core spiral chute - A spiral guards are used on both sides of the trough or bed. 2.140.13 Open spiral chute A spiral chute which

chute without is not fabricated

core or column.

an outer enclosure. through the or

2.140.14 Pneumatic chute or spout - A chute or spout in which air is introduced bottom to facilitate movement of bulk materials down a slight decline.

2.140.15 Screen chute - A discharge chute equipped with a screen section, either stationary vibrating, to remove the finer portions of the material being handled from the major line of flow. 2.140.16 Screen loading chute - A type of chute with permits fines to fall onto the conveyor belt first, providing passes over the screen. 2.140.17 Spiral chute material or unit load are ( see Fig. 18 ). A continuous guided while a bar screen or grizzly a cushion for the larger smooth trough in substantially bottom material

which which

straight, curved or spiral being lowered by gravity

over which bulk helical patch

FIG. 18 SPIRAL 2.140.16 Straight objects in a straight


chute - A sloped chute designed to transfer line from points of entry to points of discharge. A chute so mounted that it may be rotated.





2.140.19Swivel chute -

2.141 Circular Bin Discharger - A revolving cone with feeder connected at the apex through a universal joint to a revolving 2.142 Circulating Load - Material, packages not being discharged or removed from it. or objects that

fingers around the arch breaker arm. remain


periphery of

in or on a conveyor by density

by virtue

2.143 Classification - The process of approximately the mechanical use of a fluid medium. 17



or size


�IS: 4240 - 1984 2d',`l4: sCleanou t Box 2.145 Cleanout Door elevator housing. A receptacle A name in a floor conveyor used to describe for the purpose of gathering and removal in a conveyor of or

or indicate

a cover and opening

2.146 Cleat - An attachment fastened to the conveying medium to act as a pusher, support, or trip, etc, to help propel material, parts or packages along the normal path of conveyor May be of various sizes and shapes to suit the application. 2.147 Closed Circuit through all portions

check travel.

of a conveyor or conveyors capable of moving material - An arrangement of the circuit and returning the undistributed portion to the starting point.

of equipment while in motion or 2.148 Clutch - A device to permit engagement or disengagement at test, Operation can be manual or automatic. A clutch connecting two shafts end-to-end is called a cut-off coupling. A clutch with an extended sleeve on which a pulley, sprocket, gear or other power transmission device is mounted and which runs freely on the supporting shaft when disengaged is called a sleeve clutch. ( See a/so 2.148.1 and 2.148.2 ). 2.148.1 Friction pressure elements engaging revolving in which driving effort is developed by contact between clutch - Any clutch through friction alone. General use is for the purpose of engaging or disparts. Also as a safety appliance to permit slip when overload is encountered. A clutch in form. in which driving effort is transmitted through jaws or teeth which

2.148.2 Jaw clutch may be square or spiral 2.148.3 Positive clutch 2.149 Coal Pocket -

See 2.148.2. of bins to load trucks by gravity.

An arrangement

numerical expression of the ratio between the force of contact 2.150 Coefficient of Friction -A existing between two surfaces and the resistant force tending to oppose the motion of one with respect to the other. The coefficient of friction is used in determining the power determine the slope angles used in hoppers, bins, chutes, maximum angle of inclination for a conveyor. or wheel-mounted 2.151 Coil Buggy - A roller tension reel and transfer to a coil conveyor. 2.152 Coil Titter 2.153 Collar See 2.550 and 2.671. used for positioning shafts or other machine parts. ( See also 2.170 ). or transfer necessary to drive a machine; to and bunkers; or to determine the of coiled steel from the

unit for removal

A device

2.154 Compound - The term plastic ) and other ingredients

applied by manufacturers to the mix containing polymer ( rubber which are compounded and used in conveyor belt production.

circular 2.155 Conical Sorting Table - A rotating unit loads, such as parcels and baggage. Incoming so as to work their way to the outside circumference the outer edge. ( See 2.163.21). 2.156 Constant Flow Weigh constant rate by weight. 2.157 Continuous length or stream System A system

table, generally powered and used for sorting loads are delivered at the peak of the cone as loads are removed from the low point along

in which

the flow of material

is maintained

at a

Checking Scale - A device of material, or an intermittent

which series

automatically of individual

weighs a continuous moving items passing over the scale. or for

2.158 Control - A device for actuating conveyor components.

starting, stopping Can be manual,

or selecting variable speeds for conveyors electric, hydraulic or pneumatic operation.

2.158.1 Adjustable voltage control - A form of armature voltage control of D.C. motors obtained by impressing on the motor armature a voltage which may be changed in very small increments, but when onceadjusted, it and consequentiy the speed of the motor are practically unaffected by a change in the load. 18

2.158.2Amplitude control - A means of controlling or oscillating machines such as a conveyor or screen. or varying the normal stroke of a vibrating

the speed of a D.C. motor by means 2.158.3Armature voltage control - A method of controlling of a change in the magnitude of the voltage impressed on its armature winding. 2.158.4 Automatic despatch control - A system used to direct a unit load and/or conveyor to a predetermined destination without operator attention. 2.158.5 Converging control See 2.158.10. carrier

system in which the controlled quantity is 2.158.6 Feed back control system - A control measured and compared with a standard representing the desired performance. Any deviation from standard is fed back into the control system in such a sense that it will reduce the deviation of the controlled quantity from standard. 2.158.7Interlocking maintains a controlled starting controls. 2.158.8Starting controls relationship A system of electrical controls foi a system of conveyors which between the units of the system. Sometime applied to sequence See 2.158.7 and 2.534.

sequence controls

A motor control assembly incorporating a torque sensing device 2.158.9Torque limit controlwhich transmits a signal to the associated control components which are arranged to correct and When sensing current, this device is also known as a current maintain a present torque value. limit control. 2.158.10 Traffic control - A mechanical as they merge from two lines into a single or electrical line. mechanism to prevent collusion of objects

2.159 Controller - An electro-mechanical device or assembly of device accelerating, decelerating a conveyor drive, or which serves to govern manner the electric power delivered to the drive. 2.160 Converging Section merge into one conveyor. 2.161 Conveying 2.162 Conveying or objects. Element Medium A section of roller or Wheel conveyor

for starting, stopping, in some predetermined meet and

where two conveyors

See 2.162. That portion of a conveyor that moves or carries materials, packages

inclined, or vertical device for moving or transporting bulk 2.163 Conveyor - A horizontal, materials, packages, or objects in a path predetermined by the design of the device and having points of loading and discharge fixed, or selective; included are skip hoists and vertical reciprocating conveyors; industrial trucks, tractors and trailers, tiering machines ( truck type), cranes, hoists, monorails, power and hand shovels, power scoops, bucket drag lines, platform elevators designed to carry passengers or the elevator operator, and highway or rail vehicles are not included. having double strands of chains connected by 2.163.1Accumulator conveyor - Conveyor spindles supporting freely rotating load carrying rollers and designed to permit accumulation of packages or objects. Usually roller, live roller conveyor, roller slat conveyor or belt conveyors ( see Fig. 19 ).


�IS :4240 - 1984
2.163.2 Apron conveyor by rollers or sliding [ see Fig. 20 (a) I. plates forms the

a) Genera/ - Conveyor having chains as the driving medium supported tracks and having attached plates or pans forming the carrying surface b) A conveyor in which an apron composed moving bed [ see Fig. 20 (b) 1, of shaped or flat overlapping


(b) conveyor upwards with deep pans - Apron conveyor to form open pans ( see Fig. 21 ). in which the sides and ends of Apron the plates are turned







conveyor -



2.163.3 Archimedes



consisting of an endless belt, or one or more chains, to 2.163.4 Arm conveyor - A conveyor arms or shelves, for handling packages or objects in a vertical or which are attached projecting inclined path ( see Fig. 22 ).




Ash conveyor


See 2.16363

and 2.163.99. 20

�IS : 4240 - 1984
2.163.6 Assembly conveyor -


a series

of progressive

Any type of conveyor adapted to convey assembly operations ( see Fig. 23 ).


or parts




2.163.7 2.163.6

Banana Band

conveyor conveyor -




Any type of conveyor usually installed in trenches along the rear of 2.163.9 Barn conveyor stalls in barns for the purpose of removing manure and delivering it to storage pile or farm vehicle.



conveyor conveyor



2.163.106 and 2.676.

2.163.11 Belt

a) An endless fabric, rubber, plastic, leather, or metal belt operating over suitable drive, tail end and bend terminals and over belt idlers or slider bed for handling bulk materials, packages, or objects, placed directly upon it ( see Fig. 24). The belt is b) Conveyor using an endless moving belt for the carrying and tension medium. usually driven by a pulley at one end acting on the upper portion of the belt passing over The belt may also be driven by a pulley acting on a free-running pulley at the other end. The carrying portion of the belt may be the return side of the belt or by several pulleys. This type of conveyor may be supported by free-running idlers or suitable flat surfaces. arranged for horizontal inclined or declined travel, the slope depending on the character of the goods conveyed and the type of belt surface.



- A conveyor composed of two moving belts working in unison, 2.163.11 .l Blanket belt conveyor The load is carried between the two belts ( see the carrying faces being in or near contact. Fig, 25 ). This conveyor can be used up and down steep inclines.


�IS : 4249 - 1994


BELT CONVEYOR Cable belt conveyor - A belt in which the carrying section is composed of rubber and/or other polymer and fabric with specially shaped moulded rubber/polymer edges, The edges rest on and are supported by metal cables which transmit the driving force, the belt merely functioning as a load supporting medium. Chain or wire we belt conveyor - A conveyor composed of a belt secured to transverse supports and carried by moving chains or wire ropes, The chains or wire ropes transmit the driving force with the belt forming the load-carrying medium ( see Fig. 26 ).


OR WIRE ROPE BELT CONVEYOR Closed be/t conveyor - Conveyor composed of a moving, endless, flexible belt, or belts, capable of being formed into a closed tubular shape, While in motion the belt opens to receive load, closes to convey or elevate, and open to discharge ( see Fig. 27 ).



BELT CONVEYOR Curved be/t conveyor - A unit ( See a/so 2.49.6 ). through 90" or 180" turns.








�in which Flat belt conveyor - A type of belt conveyor ( See also 1. conveyor belt is suppoited by flat belt idlers. Hugger be/t conveyor - Two belt conveyors convey loads up steep inclines or vertically. whose


carrying surface



the to bed



belt conveyor Magnetic be/t conveyor - An inclined containing permanent magnets for handling ferrous metal parts. Multiple cord belt conveyor strands of vee, double vee or round belts. A belt conveyor

operating of two

over a slider

composed having

or more spaced surface of two Multiple ribbon belt conveyor - A belt conveyor or more spaced-strands of narrow conveyor belts. Pocket belt conveyor See 2.132.6.

a conveying Portable belt conveyor - A portable ( See a/so 2.163.11 ). conveying medium. Portable, surface. flat, belt conveyor -

conveyor upon which

a belt

is used as the

See and 2.163.100.

Ribbon belt conveyor -See Sliding be/t conveyor - composed of a moving belt sliding on a smooth is a thin, elevated idlers or

Conveyor Steel be/t conveyor flexible steel band.

A flat belt conveyor

in which

the carrying

medium Troughed be/t conveyor - A belt conveyor with the conveyor belt edges on the carrying run to form a trough by conforming to the shape of the troughed carrying other supporting surface. Vertical be/t conveyor A longshoreman's term applied to a pocket

conveyor. a flat or Walled belt conveyor - A conveyor composed of a moving belt having troughed carrying face extended to form side walls of limited heights ( see Fig. 28 ).


BELT CONVEYOR rope be/t conveyor 2.163.12 Blending conveyor -


See and type of conveyor mounted on a boom. used to regain elevation lost in

2.163.13 Boom conveyor -Any 2.163.14 Booster conveyor gravity roller or wheel conveyor

Any type of powered lines ( see Fig. 29 ).





�IS : 4240~1984
2.163.15Bucket conveyor - Any type of conveyor in which the material buckets (see2.241.4, 2.91.5, 2.91.9, and 2.91.131. Bottom discharge bucket conveyor - A conveyor_ for carrying horizontal path consisting of an endless chain to which roller-supported discharge conveyor buckets are attached continuously ( see Fig. 30 ). is carried in a series of

bulk materials in a cam-operated bottom




CONVEYOR Pivoted bucket conveyor - A type of conveyor using pivoted buckets attached between two endless chains which operate in suitable guides or casing in horizontal, vertical, inclined or a combination of these paths over drive, corner and takeup terminals ( see Fig. 31 ). The buckets remain in the carrying position until they are tipped or inverted to discharge.





rope conveyor


See 2.163.34. in which the can

2.163.17Cab/e-can conveyor - A type of conveyor used in can manufacturing between can guides. is supported on a moving endless cable or cables operating 2.163.16 Capacity-flow conveyor See 2.163.40.

2.163.19Car type conveyor - A series of cars attached to and propelled other linkage running on a horizontal or slight incline ( see Fig. 32 ).

by an endless






2.163.20 Car
in a





2.163.50 and 2.163.137.
platforms which move

2.163.21 Carrousel conveyor - A continuous platform or series of spaced circular horizontal path ( see Fig. 33 ). ( See also 2.163.25).
Note The term `carrousel' has been applied to other forms of conveyors,

such as car and pellet







2.163.22Case conveyor similar objects.









large cans


2.163.23Chain Conveyor - Any type of conveyor in which one or more chains act as the conveying element. ( See, and ). Sometimes synonymous with 2.163.140.




in which the Air-float chain conveyor - A chain and roller conveyor supported by an inflatable air hose to control and minimize line pressure ( see Fig. 34 ). Chain conveyor with driving dogs unit load supported by independent slide or roller ( see Fig. 35 ).



Chain conveyor with pusher dogs driving the tracks directly or by means of a palette, or truck






which Drag chain conveyor - A type of conveyor drag bulk materials in a trough ( see Fig. 36 ).












�ISI :4240-1984

2.163 .23.4 Monorail

chain or cable conveyor

-- See 2.763.140,

2.163 .23.5 Monorail chain conveyor, enclosed traclt -- Chain conveyor using hi-planer articulated chain which serves to transmit the driving force and carries the weight of the load. It has rollers disposed in the vertical and horizontal planes running in an enclosed track ( see Fig, 37).







2.163 .23.6 Offset roller chain conveyor

-- See

2.f 63.23.7 PJain chain con~eyor -- See 2.163,23.1 f, 2.163 .23.8 Pusfwr chain conveyor -- One or more endless chains, with attachments trllcks, ~o[]ies, or cars along stationary or retard the movement of packages, objects, or roller beds, troughs, rails or tracks.
2.163 .23.9

which move wood, metal

strands of Fig, 38 ).

Raise link or offset roller chain conveyor -- Conveyor chain running in parallel trucks with the loads carried

consisting of two or directly on the chains

more ( see








consisting of one or more endless roller Rolling chain conveyor -- A conveyor chains on which packages or objects, are carried ( see Fig, 39 ), The speed of transportation is double that of the chain speed.







�fS:4240-1984 Sliding chain conveyor packages or objects are carried One or more endless ( see Fig. 40 ). chains sliding on tracks on which





CONVEYOR Vertical chain conveyor - opposed shelf type - Two or more conveying units opposed to each other ( see Fig. 41 ). Each unit consists of one chains whose adjacent facing runs operate in parallel paths. Thus, each pair of or brackets receive objects ( usually dish trays ) and deliver them to any number

vertical elevating or more endless opposing shelves of elevations.




2.163.24 Chassis assembly conveyor 2.163.25 Circulating Plate/Tray conveyor having horizontal plates

See 2.163.6. single chain

Conveyor Horizontal - Floor-mounted circulating or trays carrying the loads ( see Fig. 42 ).





2.163.26 Coilconveyor - Any of several types of conveyors strip or other annular objects ( see Fig. 43 ).


to carrying




�IS : 4240 - 1984



stream conveyor -

See 2.163.40. adapted for continuously cooling agent. or cooling wire material mesh belt or objects specially

2.163.28 Cooling conveyor - A conveyor while conveying through a gaseous or liquid 2.163.29Corner conveyor - Conveyor performed to turn corners in the horizontal

having either a rubber plane ( see Fig. 44 ).




2.163.30 Corner-fastened tray conveyor - Suspended tray conveyor with chains so arranged as to attach to diagonal corners for the purpose of keeping the tray surface level throughout the path of travel. 2.163.31 Corner-hung 2.163.32 Declining tray conveyor See 2.163.30. transporting adapted down a slope. materials ( See a/so 2.163.113 ). or objects for continuous

conveyor -

A conveyor

2.163.33Dipping conveyor - A conveyor processing while being conveyed.

for dipping

2.163.34 Disc or button conveyor - Conveyor composed of an endless wire rope or chain carrying discs or buttons and operating in a V-shape trough ( see Fig. 45) for the purpose of conveying or regarding the movement of bulk materials or objects.




�IS : 42401 1984
2.163.35Distributing points along the length conveyor - A conveyor of the conveyor. with two or more individually selective discharge

2.163.36 Double helical beg conveyor - Closely spaced parallel tubes with right and left hand rounded helical threads rotating in opposite directions on which bags or other objects are carried while being conveyed ( see Fig. 46 1.




2.163.37Drag bar or drag link ( scraper ) conveyor - A conveyor having one or more equipped with scraper bars pushing the material in a trough shaped casing ( see Fig. 47 ).







2.163.38El conveyor - A trough type roller or wheel conveyor consisting of two parallel rows of rolls or wheels set at a 90" included angle, with one row providing a sloped carrying surface and the other acting as a guard. ( See a/so 2163.114 and 2.163.151 1. 2.163.39 Elevating conveyor - Any conveyor used to discharge that at which it was received. Term : is specifically applied to certain material at point higher than underground mine conveyors.

a series of skeleton or solid flights on an 2.163.40 En masse conveyor - A conveyor comprising inclined, or vertical paths within a endless chain or other linkage which operates in horizontal, closely fitted casing for the carrying run ( see Fig. 48 ). The bulk material is conveyed and elevated. `en masse' in a substantially continuous stream with a full cross-section of casing.





carrying Double leg en masse conveyor - An en masse conveyor and return runs are operated in separated parallel and adjacent

or elevator casings.




of horizontal closed circuit Side pull en masse conveyor - An arrangement conveyor in which the tension element is at one side and above the moving stream of material. 29

�IS :4240 -1984
2.163.41Entry conveyor See 2.163.143 and 2.248.

2.163.42 Extendable

conveyor or shortened while in

a) For bulb materials, usually of troughed design and may be lengthened operation. Commonly used in underground mine conveyor work.

b) For packaged materials, objects, or units, one of several types including roller, wheel, and belt conveyors. Construction is such that conveyor may be lengthened or shortened within limits to suit operating needs. 2.163.43 Face conveyor 2.163.44 Festoon 2.163.45 Fixed See 2.163.145. See 2.173.1. sited conveyor. on which are mounted `pedestals'




2.163.46 Fixture conveyor - Usually a slat or apron conveyor or fixtures for mounting loads such as engine btocks.

top and are suppor2.163.47 Flat top conveyor - Special slat conveyors which form a continuous ted with large chain rollers. These conveyors are usually erected in two parallel lines straddling an inspection pit for automobile final assembly ( see Fig. 49 ). ( See a/so 2.163.6 and 2.163.89>.



2.163.48Flight conveyor - A type of conveyor comprising one or more endless such as chain, to which flights are attached and a trough through which material flights ( see Fig. 50 ).

propelling media, is pushed by the



CONVEYOR Bar flight



See and 2.163.48. hinged flights Reciprocating flight conveyor - A reciprocating beam or beams with arranged to advance bulk material along a conveyor trough ( see Fig. 51 ).



CONVEYOR Roller 2.163.49Floating


conveyor -


See See 2.163.119. floating on pontoon. Sectional


conveyor Conveyor


2.163.50 Floor conveyor - Any of several types of conveyors using chain, cable or other linkage mounted near or flush with the floor for the purpose of assembling, or finishing built-up products and subassemblies ( see Fig. 52 ). ( See a/so 2.163.19, 2.163.89and 2.173.7 ). 30

�IS: 4240-1984





conveyor, single freck A channel through

See 2.163.137. which a liquid flows and conveys materials.

2.163.52Flume conveyor 2.163.53Foundry

moold conveyor -

See 2.163.78. which moves material through a furnace

2.163.54Furnace conveyor 2.163.55Gathering conveyor -

The conveyor

See 2.163.143. See 2.163.84. conveyor set at an angle to the horizontal


conveyor -

2.163.57Gravity conveyor - A foim of roller or wheel to cause the load to move under the force of gravity. Controlled gravity conveyor -

See with a guide which engages a wheel,

2.163.58 Guided pallet conveyor - A pallet conveyor equipped roller or other device mounted on the pallet being conveyed.

adapted to loading or unloading 2.163.59Hatch conveyor - Any of several types of conveyors bulk materials, packages or objects to or from ships or barges. ( See a/so 2.163.11,2.163.7 and 2.163.99 ). 2.163.60Haulage conveyor 2.163.61 Helical See 2.163.143. See 2.163.36. circuit conveyor A run-around conveyor or conveyors in a

bag conveyor closed

2.163.62 Horizonfal horizontal plane.

in which water jets form the conveying 2.163.63 Hydraulic conveyor - A type of conveyor medium for bulk materials through pipes or troughs ( see Fig. 53 1. This is often a specialized form of conveyor for the handling of ashes.




�IS : 4240 - 1984
2.163.64 Inclined Reciprocating conve,yor - A reciprocating power or gravity actuated unit which receives only inanimate objects on a track, roller conveyor or other form of carrying surface not designed to carry passengers or the operator. These units operate on inclines of less than 90" to the horizontal and usually at less than 45". This type of conveyor is never designed to carry an operator or passengers and no person may be permitted to ride on it. No controls for movement of the carrier may be located on the carrier nor within reach of any person who might be standing on the carrier. For carriers operating on steeper than stairway slopes further safeguards are necessary and the construction should follow the provisions given for vertical reciprocating conveyors. ( See also 2.163.144. ) 2.163.65 for casting on Ingot casting conveyor - A type of pan conveyor ingots or pigs ( see Fig. 54 )# (See also 2.163.90. ) which the pans serve as moulds





2.163.66 Inventory



See 2.163.1. See types of conveyors or other conveyors. for adapted lowering for of loading objects bulk at a

2.163.67 Lazy tong conveyor -

2.163.68 Loading conveyor - Any of several materials, packages, or objects into cars, trucks,

2.163.69Lowering conveyor - Any type of vertical conveyor controlled speed. ( See also 2.163.4, 2.163.135 and 2.163.147. ) 2.163.70 Main conveyor 2.163.71 Merry-go-round See 2.163.143. conveyor See 2.163.21.

a powered 2.163.72 Metering conveyor - In package handling, are controlled to release units at a pre-determined rate. 2.163.73 Milking conveyor - One used for the ( See a/so 2.163.2, 2.163.21 and 2.173.7. ) 2.163.74 Mine conveyor 2.163.75 Minimum build-up of pressure See 2.163.144. movement


whose speed and motion milking operations.

of cows


pressure accumulating conveyor - A type of conveyor designed to minimize between adjacent packages or cartons ( see Fig. 55 ). ( See a/so 2.163.1. )






2.163.76 Mixing

conveyor -

See and more ( see

of one or Screw type mixing conveyor - A type of screw conveyor consisting conveyor screws, ribbon flight or cut flight conveyor screws with or without auxiliary paddles Fig. 56 ). ( See a/so 2.163.119. ) 32

�IS: 4240.1984






2.163.77 Mobile

conveyor places as a unit.

a) Conveyor used in different b) Conveyor on wheels

or crawlers. moulds from to shade-out. moulding stations, ( See a/so 2.163.19,

2.163.76 Mould conveyor - A conveyor used for handling through pouring and cooling operations and delivering moulds 2.163.21, 2.163.69, 2.163.114and 2.163.79Monorail towing conveyor overhead - See 2.163.137. See 2.163.143.

2.163.60Mother conveyor 2.163.61Moveable to be moved laterally 2.163.62Multiple

conveyor - Any of several types of conveyors on sledges over short distances. ( See a/so 2.163.99and 2.163.125. ) strand conveyor two or more spaced strands of chain, belts,

or skids


a) Any conveyor which employs load-supporting medium. b) Any conveyor pans, etc. 2.163.63Normalizing furnace under heat. in which

or cords



two or more strands

are used as the propelling



conveyor -







a normalizing

2.163.64Oscillating conveyor - Conveyor of the slow speed type, using an eccentric shaft to move the trough or tube; the movement having high amplitude and low frequency 57 ). ( See also 2.163.146. )

or crank( see Fig.



2.163.65Over-and-under conveyor - Two endless chains or other linkage between which carriers are mounted and controlled so that the carriers remain in an upright and horizontal position throughout the complete cycle of the conveyor ( see Fig. 58 ),





�IS : 4249. - 1904
2.163.66Overhead conveyor 2.163.67Paddle conveyor See 2.163.140.


2.163.66 Paddle washer conveyor A type of conveyor consisting of one or two inclined parallel paddle conveyor screws in a conveyor trough having a receiving tank and an overflow weir at the lower end and a discharge opening at the upper end ( see Fig. 59 ).




2.163.69Pallet type conveyor - A series of flat or shaped wheelless carriers attached to one or more endless chains or other linkage ( see Fig. 60 ).


by and




one or more endless chains or other linkage to 2.163.90Pan conveyor - A conveyor comprising which usually over-lapping or interlocking pans are attached to form a series Of shallow, opentopped containers. Some pan conveyors have been known also as apron conveyors ( see Fig. 61 ).


61 PAN


people who enter and leave the con2.163.91Passenger conveyor - A conveyor for transporting veyor by walking or stopping and who either stand, sit, or walk on the conveyor while being transported ( see Fig. 62 ). 34












and a relatively thin bed of

2.163.93 Picking conveyor A belt or apron conveyor used to carry material past pickers who hand sort, or pick the material being conveyed. 2.163.94Pig 2.163.95Pig
conveyor mould conveyor See 2.163.65. See 2.163.65.

Two or more endless chains to which cross bars are attached 2.163.66 Pin type slat conveyor at spaced intervals, each having affixed to it a series of pointed rods extending in avertical plane on which work is carried, used principally in spraying or washing operations where the least amount of area of the product is coniacted. 2.163.97Platform
conveyor See

2.415 and 2.173.7. or ducts through which bulk or material mechani2.163.100,

- An arrangement of tubes 2.163.98Pneumatic conveyor or objects are conveyed in a pressure and/or vacuum system.

- Conveyor designed to be lifted and moved manually 2.16366 Portable conveyor cally as a unit from one position to another ( see Fig. 63 ). ( See a/so,2.163.68, 2.163.139, 2.163.144, 2.163.151, 2.385.1, 2.385.2.1 and 2.670.1).




2.163.100Portable drag conveyor A portable conveyor upon which endless drag chains are used as the conveying medium. Also a term sometimes applied to a portable flight conveyor. ( See also ). 2.163.101Power-and-free conveyor A conveying system wherein the load is carried on individual trolleys which are conveyor-propelled through part of the system and may be gravity or manually-propelled through another part ( see Fig. 64 ). This arrangement provides a means of switching the free trolleys into and out of other adjacent lines. 35

�IS :4249 - 1984



2.163.102Power-propelled wheels or crawler mounted 2.163.103Pull-through for pulling hogs through

-A portable conveyor truck conveyor power driven truck prcviding self-mobility. conveyor - A packing a scalding tank, house term applied




to a type of tow conveyor

2.163.104 Push bar conveyor together by fixed bars arranged ( see Fig. 65 ).

- Conveyor normally having two strands of chains connected for pushing unit loads along a separate smooth track or trough




2.163.`lO5 Quench 2.163.106 Rack 2.163.107Ramp bar


conveyor See



2.163.28and 2.163.33.


2.163.109. 2.173.7 and 2.411. beams with tilting


- One or more parallel reciprocating 2.163.108 Reciprocating beam conveyor dogs or pushers, arranged to progressively advance objects ( see Fig. 66 ).




2.163.109Reciprocating 2.163.110Reclaiming

car conveyor conveyor





�IS : 4240 - 1984
a) Any of several b) The conveyor types of conveyors which receives used to reclaim bulk materials from storage. system.


from the reclaimer

in a blending

2 163.111 Refuse conveyor -

Any conveyor handling waste or refuse.

2.163.112Refarding conveyor - Any type of conveyor used to retard the rate of movement of bulk materials, packages or objects where the slope is such that the conveyed material tends to propel the coveying medium. 2.163.113 Ribbon conveyor infernal surface of which is fitted See the inner

ribbon conveyor - A trunnion-supported revolving cylinder with continuous or interrupted ribbon flighting ( see Fig. 67 ),





consisting of a framework having 2.163.114Roller conveyor - Conveyor which objects are advanced manually, by gravity Or bY power ( see Fig. 68 ).




FIG. 66 ROLLER CONVEYOR permits variation in length


conveyor - A rOkw COnveYOr with ( see Fig. 69 ). ( See also 2.163.114 ).

a flexible







limit Braked roller the speed of the load.

conveyor -





braking having


which Controlled velocify roller conveyor - A roller the velocity of the objects being conveyed ( see 2.163.114 ). Gravify roller conveyor See 2.163.114.



to control Herringbone roller conveyor - A roller conveyor consisting of two of roils having one or both series skewed ( see Fig. 70 ). ( See also 2.163.114. ) 37




ROLLER CONVEYOR Hydrostatic roller conveyor - A section weighted with liquid to control the velocity of the moving Live roller conveyor - A series application of Power to all or some of the rolls. or chain ( see Fig. 71 ).

of roller conveyor having rolls objects. ( See a/so 2.163.114. )


of rolls over which objects are moved by the The power transmitting medium usually is belting





conveyor -


See employing rollers for slats ( see Fig. 72 ).

slat conveyor

A slat conveyor






See roller conveyor See --A roller conveyor having a series of rolls skewed to lt may have a fixed or adjustable guide member. member.

Shock absorbing, Skewed roller conveyor direct objects laterally against a guide ( see Fig. 73 ).




�IS : 4240 - 1994 Speedup roller conveyor - A powered its feeder to create space between unit loads. roller conveyor operating at a higher the rolls speed are of


in which Spool type roller conveyor - A type of roller conveyor conical or tapered shape with diameter at ends of roll larger than at the centre. b) A section Spring mounted conveyor of roller roller conveyor a) A type of roller where the ends of each roll is supported supported on springs.

on a spring.


for transferring a load Transfer roller conveyor, right angle type - Equipment from one roller conveyor to another running at right angles, by means of small, manually or poweroperated lifting rollers (see Fig. 74 ).





TYPE roller load from one roller conveyor ( see Fig. 75 ).

conveyor, straight through to another by means of





Equipment topped

for transferring a traversing section







roller conveyor having two rows of rolls set at an Troughed roller conveyor -A angle to form a trough over which objects are conveyed ( see Fig. 76 ). ( See a/so 2.163.36. )



�IS : 4240 - 1984 V-Type roller 2.183.115 Room conveyor conveyor See

See 2.183.144. conveyor See 2.183.34.

2.183.118 Rope and button

2.183.117 Scraper conveyor -

See 2.183.37and 2.183.48.

2.183.118Screw auger conveyor - Conveyor equipped with a solid helix working in a horizontal or inclined position. The helix is longer than trough at the feed end and pushes the product rotates at a relatively high speed. The through the tube ( see Fig. 77 ). The shaft normally conveyor is generally used for intermittent light duties and for free flowing non-abrasive material.





2.163.119 Screw conveyor - Conveyor with a stationary trough the material being moved by the action of a rotating helix. Cab/e-screw conveyor - A one-way or closed propelling medium is a flexible, torque transmitting cable of which integral part. Loads or load carriers engage revolution of the cable-screw. the thread and advance

or tube circuit helical

as the



conveyor of which the ( screw ) threads are an on each

a distance

equal to one pitch Full bladed type, screw conveyor - A conveyor in which the conveying element is in the form of a solid helix with either constant or varying pitch shaft and helix fill the whole conveying cross-section of the tube or trough attached to a central rotating shaft working within a trough ( see Fig. 78 ).






screw conveyor


See Paddle type screw conveyor - Conveyor with conveying elements in the form of separate paddles of various shapes attached to the central shaft in a helical pattern, allowing mixing of the materials during conveying ( see Fig. 79 ).




CONVEYOR Ribbon flight screw conveyor screw ( see Fig. 80 ). ( See also2.183.120. )

A screw conveyor


a ribbon




�`1%: 4240 - 1994

FIG. 80 RIBBON FLIGHT SCREW CONVEYOR Rotating casing screw conveyor - A screw conveyor rotates at a differentspeed or in an opposite direction to the conveyor Screw tube conveyor of a ribbon helix attached to the inside

in which the tubular casing screw. ( See also 2.163.119. ) element is in the form

A conveyor in which the conveyor of a revolving tube ( see Fig. 81 ).


screw conveyor


See 2.163.119.

2.163.120Scroll conveyor -

See2.163.119 and so arranged as to feed itself

type of conveyor 2.163.121Self-feeding conveyor - Any automatically without the necessity of using a separate feeder. Self-feeding portable conveyor - Any type of power-propelled to advance into a pile of bulk material, thereby automatically feeding itself, 2.163.122 Shaker conveyor A type of oscillating conveyor.



2.163.123Sheet drying conveyor - A disc type Of live roller conveyor equipped with from a blower to remove dampness from processed sheet metal while being conveyed, 2.163.124 Sheet processing conveyor - A system of conveyors designed sheets through slitting, shearing, piling, and stack removing operations. such as belt, chain, pan, 2.163.125 Shuttle conveyor - Any conveyor, self-contained structure movable in a defined path parallel to the ( see Fig. 82 ). to handle


outlets strip or


apron and screw in a flow of the material


2.163.126Side pusher conveyor - A trolley free trolleys on parallel track, or with pushers 2.163.127Slope conveyor through an inclined passage and 2.163.46.)

conveyor with arms cantilevered to the side to push to engage the cantilevered arms of free trolleys.

Usually a troughed belt conveyor used for transporting coal or ore to the surface from an underground mine. ( Seealso 2.163.2, 2.163.11

them 2.163.126 Sorting conveyor - A conveyor which receives mixed unit loads and discharges to segregated spaces or conveyors in response to an automatic dispatch control. Operator attention is usually required to introduce the despatch signal into a memory system. 2.163.129Spindle conveyor - A chain-on-end conveyor in which the chain pins are extended in a vertical plane, usually of enlarged diameter in that portion above the chain, on which special revolvable fixtures can be rotated, for the purpose of spraying or drying. Outboard rollers or sliding shoes support the chain and product. 41

�IS:4240 -1994.
2.163.130Spiral 2.163.131 conveyor -See 2.499, 2.163.119 and 2.690.

Stabilized tray conveyor -

See i.163.6&.

2.163.132 Stacker conveyor - See 2.660.
2.163.133Stick conveyor -

See 2.173.1. A belt conveyor
conveyor. conveyor having receive objects one or more endless chains at one elevation(s) and deliver in a blending system which received bulk

2.163.134 Stocking
materials for delivery

conveyor to the stacker

2.163.135Suspended Tray ConveYor - A vertical with suitable pendant trays, cars or carriers which them to another elevation(s) ( see Fig. 83 1.




2.163.136Telescoping Conveyor - A type of conveyor, the length telescoping frame members ( see Fig. 84 ). ( See also 2.163.42).

of which

may be varied




2.163.137Tow lconveyor - An endless chain supported by trolleys from an overhead track or running in a track at ( above, flush with or under ) the floor with means for towing trucks, dollies or cars ( see Fig. 85 ). The towed trucks can follow a predetermined path, sometimes having minor inclines.


85 TOW



�ts.: 4240- 1984
2.183.138Transfer conveyor main unit to another. A short length of conveyor used to tiansfer material from one

light-weight portable conveyor, 2.163.139Trimmer conveyor - A self-contained, belt type, for use in unloading and delivering bulk materials from trucks to domestic for trimming bulk materials in bins or piles ( see Fig. 86 ).

usually of the storage, and



supported from or within an overhead track 2.183.140 Trolley conveyor - A series of trolleys and connected by an endless propelling medium such as chain, wire rope or other linkage, with conveyors may be designed for leads usually suspended from the trolley ( see Fig. 87 ). Trolley ( See a/so 2.132.48. 1 single or multiple plane operation.

FIG. 87



- A trolley conveyor where the propelling medium Enclosed track trolley conveyor such as chain, cable or other linkage and the trolleys or load carrying wheels are supported and completely enclosed by a tubular type track. ( See also 2.183.140. ) Overhead 2.183.141 Truck unloading trolley conveyor See 2.183.140.


See 2.183.139. in which the carrying surface and guard gradually

2.183.142Twist conveyor - An El conveyor exchange their functional duties.

- They are sectional conveyors, usually of the troughed 2.183.143 Underground mine conveyors belt type, capable of being lengthened or shortened as mining operations advance or retreat, all as contrasted to above ground conveyors having fixed lengths for reasonably permanent installations. According to location in the mine or usage, they may be known as face, room, gathering, main (See also 2.183.11, and 2.183.48. ) haulage or intermediate haulage conveyors. 2.183.144 Unloading conveyor - Any of several types of portable ing bulk materials, packages or objects from conveyances. conveyors adapted for unload-

2.183.145 Vertical articulated plafform conveyors - A type of vertical conveyor in which sections of articulated slat conveyor apron form rigid platforms for vertical movement in continuous flow. The platforms are flexible in all but one direction and they assume a vertical position on the non-carrying run to minimize space requirements ( see Fig. 88. ) 2.183.148Vertical conveyor to another elevation)s). Any conveyor that carries loads vertically from one elevation(s)


�FIG. 88





reciprocating power or gravity actuated unit 2163.147 Vertical reciprocating conveyor -A which receives only inanimate objects On a track, roller conveyor or power conveyor forming the bed of the carrier and transmits these inanimate objects vertically from one elevation to another. This type of conveyor is never designed to carry an Operator or Passengers and no persons may with flooring of any type ever be permitted to ride upon it- The carrier must never be furnished which might provide safe footing for any Person. The conveyor shaft must be enclosed and where manual loading and unloading is employed, doors at each operating level must be installed and so interlocked with the carrier that doors at any level can be opened only when the carrier cannot NO Controls for movement of carriers may be located be moved until such open doors are closed. on carrier, or within the enclosure or within reach Of any person standing on the carrier ( see Fig. 89 ).





�IS: 4240 - 1984 2.183.148 Vibrating Conveyor - conveyor to which the high speed trough or tube movement is generated either electromagnetically or through unbalanced pulleys; the movement having low amplitude and high frequency ( see Fig. 90 ). ( See a/so 2.183.84. )

FIG. 90


CONVEYOR Balanced vibrating conveyor - A vibrating conveyor having a secondary mass operating in a direction opposite to the movement of the troughed pan for the purpose of minimising the dynamic force normally directed into the support. Helicoidal through which the product vibrating conveyor is conveyed upwards. Vibrating conveyor with an helicoidal trough Natural frequency vibrating conveyor - A vibrating free vibration of the trough on its resilient support is approximately tion induced by the driving mechanism.

conveyor in which the rate of the same as the rate of vibra-

- Conveyor, which consists of a flexibly 2.183.149 Vibratory conveyor trough or tube, in which the material, under the effect of vibrations, frequency being variable. 2.183.150 Walking beam conveyor - A conveyor beams with associated rails and/or rollers. employing a multiple

mounted metallic or plastic moves; the amplitude and arrangement of walking

supported in a frame 2.183.151 Wheel conveyor - A series of free running wheeis on spindles over which loads having suitable bases are moved manually or flow by gravity ( see Fig. 91).





See 2.183.151. conveyor making use of a series of skateon parallel spaced bars on individual Skate-wheel wheels mounted on common axles ( see Fig. 92). 2.183.152 Wheeled on wheel. truck

conveyor - A type of wheel shafts or axles or mounted conveyor -

A portable




or truck .



�IS : 4249,-1994

FIG. 92



2.163.153 Wicket conveyor - A conveyor comprising two or more endless chains connected by cross bar and to which vertical rods are attached at spaced intervals. The cross bars are als@ provided with spaced projections at the level of same to form in effect a continuous carrying surface through which product cannot fall. ( Used for handling such products as painted steel sheets, wall or composition board, etc on edge through dryers or bake ovens). 2.163.154 Wire mesh conveyor - A conveyor in which the carrying construction, either flat or shaped. The conveyor may be straight or and 2.163.29. ) 2.164. Conveyor Carpet - A flexible which does not transmit any pulling medium is of wire mesh curved. ( See also ride,

resilient surface of a moving walk on which passengers force but which is attached to the pulling medium. attached to a conveyor designed and designed to protect to protect the complete

2.165 Conveyor Cover - Any enclosure ing medium with its load. 2.166 Conveyor 2.167 Conveyor 2.166 Conveyor Housing Jack-See2.351. Scale -

the conveyconveyor.

An independent


See 2.168.1, 2.157and 2.260.10. scale scale -

2.168.1 Automatic a conveyor. 2.166.2 Totalizing 2.169 Conveyor Screw

conveyor conveyor Bushing

A device See 2.166.1.




the material




See 2.170. piece of pipe or tubing fitted to the outside or inside of

2.170 Conveyor Screw each end of a conveyor 2.171 Flight Pitch


A short pipe.

formed, 2.172 Conveyor Screw Log - A small conveyor screw flights to the shaft or pipe.


or cast


used to



2.173 Conveyor-Elevafor - A conveyor which follows a path part of which is substantially horizontal or on a slope less than the angle of slide of the material and part of which is substantially vertical or on a slope steeper than the angle of slide. 2.173.1 Cross chains supporting bar conveyor/elevator spaced cross members A type of from which conveyor/elevator normally having endless unit loads are suspended (see Fig. 93 ).

FIG. 93




�IS: 4248- 1984
in which the carrying 2.173.2 Fixed tray ( corner hung ) elevator/conveyor - Elevator/conveyor trays are pivoted at diagonally-opposite corners between two parallel strands of chain in such a manner as to maintain a horizontal position, irrespective of changes in the direction of travel. ( see Fig. 94 ).

FIG. 94


2.173.3 Gravify discharge conveyor/e~evafor - COnVeYor consisting of freely swinging buckets to discharge contents. The carried between parallel endless chains, the buckets being tipped centre of gravity of the bucket is below the centre-line of the chain, pivot and thus the chain may follow any path from horizontal to vertical with the buckets contmumg to hang vertically. Feeding of the buck& may be either or by means Of a suitable rotary feeder. ( see Fig. 95 ),


2.173.4 Magnetic belt moving adjacent magnetisable article planes ( see Fig. 96

elevator/conveyor to a static magnetic and so allows the ).

An elevator/conveyor having a flexible rubber or canvas field which imparts a retaining influence or pull to any belt to move the article through vertical or horizontal



2.173.5 Pocket conveyor/eievator festooned between cross-rods horizontal, vertical and inclined

- A continuous series of pockets formed of a flexible material carried by two endless chains or other linkage which operate in paths ( see Fig, 97 ). 47

�IS: 4240 - 1884



2.173.6Ship's conveyorlelevafor - A dock mounted pocket or suspended to be lowered into a ship's hold to varying depths for the purpose of loading and objects. Not to be confused with a marine leg. conveyor/elevator - A conveyor or elevator to which non-overlapping, non-interlocking loads ( see Fig. 98 1.
2.173.7 Slaf

tray conveyor or unloading

arranged packages



consisting of a belt or one or more spaced slats are attached for carrying

FIG. 98



2.173.6 Sling




See 2.173.5.

2.173.9 Swing tray elevator/conveyor - Elevator consisting of freely swinging finger-type trays carried between parallel endless chains which are loaded as they travel vertically upwards and Loading or unloading can be made automatic and can unloaded as they continue downwards. travel is possible in the system ( see Fig. gg ). occur at any intermediate floor level. Horizontal



�IS: 4240.1984
2.173.10V-Bucket 2.174 Conveyor Width the dimension See 2.129. used at the point or secondary where shaft a change between of direction the drive shaft of less than 180" of a conveyor inside to inside of frame rails; for bulk materials, the width of the belt. conveyor-elevator See 2.173.3.

a) In unit load handling, b) In belt conveyors

2.175 Core ( Spiral Chute ) 2.176 Corner Shaft occurs in a conveyor. The


2.177 Countershaft - An intermediate and the source of power. 2.178 Countershaft Box End -

See 2.179. A trough end of a screw conveyor fitted with a right angle drive either bevel or miter ( see Fig. 100 ). Gears may be open or

2.179 Countershaft Trough End consisting of a pair of gears, enclosed.




2.180 Counterweight 2.181 Coupling -


Any weight

used to balance

or impose

a load.

See 2.181.1 to 2.181.9. - A short piece of round shaft sections of conveyor screw. provided with a journal and

2.181.1 Conveyor screw coupling bolt holes for connecting adjoining

2.181.2Dry fruid coupling - A device similar in function and operation to a fluid coupling. A quantity of metallic shot provides the variable resistance as the driven machine comes up to speed. 2.181.3 Electric coupling - An electromagnetic coupling and coil whereby the input and output halves are electrically May be used for speed control or acceleration. usually consisting of a rotor, stator connected by excitation of the coil. slip and to

2.181.4 Flexible coupling-A mechanical connector to transmit torque without accommodate misalignment between axially oriented driven machine members. 2.181.5 Fluid coupling - A device of the kinetic energy of a fluid. used to transmit power from one shaft to another

by means

2.181.6 Rigid coupling - A device for permanently and rigidly connecting two shafts. Commonly called ` flanged couplings `. Rigid couplings do not provide for any misalignment of the shafting. 2.181.7 Split flight coupling - A rigid type shaft coupling split parallel one-half of a conveyor screw flight integral with each coupling half. 2.181.8 Torque limiting coupling - A type of overload torque transmitted exceeds a predetermined value. 2.181.9Universal to each other. coupling A device connecting release coupling rotations of the to the which of which carcass shaft slips and having when the

two shafts,

are not parallel of a conveyor

2.182 Cover - The material belt for abrasion resistance 2.183 Cover Adhesion 2.184 Cover Gauge -

applied to the top and bottom or protection for the carcass.


See 2.54. of the rubber 49 cover over the carcass of a conveyor belt.

The thickness

�IS:4240 -1984
2.185 Cover 2.188 Cover 2.187 Cradle Quality Tensile See 2.54. 2.54. See 2.550. angles to a shaft by which rotary motion is converted crank. to

-- See -

Type Tilter

2.188 Crank reciprocating

An arm attached at right motion or vice versa. A shaft which

2.189 Crankshaft


a crank or is itself

shaped to embodya

2.190 Creep - The action of a belt in alternately losing contraction in length due to lowered tension when leaving, because of stretching caused by the tight side tension.

speed on the driving pulley because of end gaining speed on the driven pulley or

or lateral member, with respect to the line of travel of chain, 2.191 Cross Bar - A transverse various shapes or sections used to space or tie together spaced parallel strands of chain. 2.192 Cross Rod A cross bar of cylindrical shape. area of the theoretical the centre into smaller load of bulk material face.

2.193 Cross-Section convayor. 2.194 Crown 2.195 Crusher -

of Load-The

cross-sectional in diameter between

on a

The difference A device

and ends of a pulley pieces.

to break up large pieces control

2.198 Cut-Off Device - A means for initiating or other piece of equipment. 2.197 Cutter Throat - The inlet Also known as cutter opening. 2.198Dead 2.199 Dead maintained Shaft A non-rotating storage covering provided shaft of

to stop the flow of material cutter for proper receipt

to a weigh


in the sample supporting bulk

of the sample. or idler. which is

a rotating in


such as a pulley

Storage - That for future use. A protective


a silo,

bunker, bin or stockpile

2.200 Decking 2.201 Deflector

over the return

run of a belt conveyor.

a) A device across the path of a conveyor discharge bulk material. b) A plate inserted 2.202 Delivery Table which transports a chute material in the trajectory


at the




deflect direction.



of a bulk material


to change

a) A conveyor

from the discharge

of a machine.

b) A table to which 2.203 Depalletizer 2.204 De-watering conveyed or elevated transit.


See 2.670.3. The process in which solid material in a manner which allows the liquid section device of roller in which either submerged to drain off while having or containing liquid is the solid material is in surface in of two

2.205 Differential Curve - A curved or more concentric row of rollers. 2.206 Digital form similar Indicator - An indicating to an odometer. The formed The A formed plate


a conveying is displayed digging

the information

numerical on a

2.207 Digger Edges bucket loader. 2.298 Digger Tools digging action. 2.209 Discharge ( See a/so 2.669 ). -

serrated tools, onto

edges of the buckets interspaced

used for


with the buckets of a bucket by a conveyor trough

loader to aid in prior to removal. area



loads are deposited conveyor

2.210 Discharge Trough End - The below the bearing for discharge.


end of a screw


an open


2.211 Diverging Section- A section of roller diverting articles from a main line to a branch. 2.212 Diverter - See2.201. 2.213 Dodd Leg See 2.396. or wheel conveyor which makes a connection for

2.214 Dolly - See 2.113. - A device 2.215 Down-Ender its side. ( See also 2.671 ). used to rotate an object from a position and, on its end to a position being carried beyond parts on the

2.216 Dribble - Material which adheres to the conveying discharge point, drops off along the return run. 2.217 Drive - An assembly of the necessary provides motive power to a conveyor. structural,

medium mechanical,




or power transmission mechanism that includes a 2.217.1Adjustable speed drive - A drive speed changing device that permits stepless control of the rotational speed within the design limits of the device. Some transmit power through cone shaped wheels and chains or V-belts; other transmit power through friction or metallic traction, hydraulic, or electrical devices. 2.217.2 Balanced drive - A drive so designed that two or more such drives may be synchronized to pull predetermined shares of the load. 2.217.3 Booster 2.217.4Caterpillar the conveyor chain. 2.217.5 Centre 2.217.6 wheels. Chain drive drive on a._single a conveyor. engages and propells conveyor



drive at an intermediate with a caterpillar



drive -

A drive equipped

chain which

See 2.217.15. A power transmission device employing a drive chain and sprocket

drive -

2.217.7Constant speed drive - A drive with no provision characteristics necessary to maintain a constant speed. 2.217.6 Corner sprocket drive A driving unit located

for variable

speed or a drive with the

at a corner

turn of 90" or more.

2.217.9 Creep drive - An auxiliary drive, usually consisting of a small motor and speed reducer, used to keep a belt conveyor in motion at a very low speed during non-operating periods in This will prevent freeze up of belt and other components. extremely cold weather. 2.217.10 Dual drive A single pulley driven by two power where two trains to propel a conveyor belt. terminals which and regulates power the

drive 2.217.11Dual pulley drive - A double sources are used to propel the conveyor belt. 2.217.12 Fixed speed drive speed to a preset value. -

sets of driving control system

A drive with a speed sensing

2.217.13 Floating drive - A conveyor drive compensate for variations in chain pull caused provisions for stopping in case of an overload.

having springs or other means to resist by starting or other load peaks and usually

and to having of the other

an auxiliary belt which bears against the surface 2.217.14 Hugger drive - A drive employing the conveying belt as it passes around the drive pulley to increase the pressure between conveyor belt and the drive pulley. 2.217.15 Intermediate than the terminals. drive A drive which transmits motion to a conveyor at a point

motion to an 2.217.16 Pinch roll drive - A double roll drive which transmits belt by means of pressure exerted on the belt as it passes between the two rolls. when the operation 2.217.17 Regenerative drive - A drive is regenerative in power being produced and absorbed by the prime mover. 2.217.16Slave drive - A own prime power source. conveyor drive powered from another


conveyor results

of the conveyor



of having



�IS : 4240 - 1984 2.217.19Snub drive - A drive where the arc of contact increased by the use of a snub wheel or pulley. 2.217.20Sprocket 2.217.21 Squeeze drive See 2.217.6 and 2.217.6. See 2.217.16. mechanically belt. with the drive wheel or pulley has been

roll drive

2.217.22 Tandem drive - A double drive where two sets of driving terminals tied together and driven from a single power source are used to propel the conveyor 2.217.23 Torque arm drive -A type of drive incorporating which the developed torque is resisted by a pivoted connecting anchor point. 2.217.24 l/aria b/e speed drive with speed changing device by which the speed

a shaft-mounted speed reducer in link between the reducer and a fixed

a) A type of drive designed be changed.

of conveyor


b) A power transmission mechanism by means of which stepless rotational speed control can be obtained. Within the limits of design, an infinite number of speeds are possible. Some transmit power through a chain and cone-shaped wheels; others drive through friction cones or hydraulic pressure or electrical energy. form of drive 2.217.25 Wrap drive -A medium, usually located at an intermediate increase the arc of contact. mechanism that transmits motion of the conveying point on the return run, and utilizing a snub wheel to friction in transmission machinery between the

power used to overcome 2.216 Drive Loss -The prime mover and the conveyor drive shaft. 2.219 Drive Pit A pit in which the conveyor

drive is located.

2.220 Driverless Tractor Train - A self-powered tractor and train of cars, carts, or other nonpowered carriers designed to follow a predetermined path consisting of a painted line, tape, electromagnetic field of a conductor or other guidance system without requiring the attention of a driver. The trains may be remote controlled or automatic in operation. 2.221 Drive Shaft

a) Main driving shaft on which the drive and conveyor sprocket wheels or pulleys are mounted. This shaft is connected to the drive unit through a coupling, sprocket wheel, gear or other form of mechanical power transmission. b) A shaft used to support the end of a conveyor screw in a trough end and as a driving nection between a conveyor screw and the power transmitting medium. 2.222 Drive 2.223 Drop a) The distance b) In a trolley chain, c) See 2.445. iron or steel support 2.224 Drop Hanger - A cast iron, malleable framework to position and bear loads. The term is usually used for supports. 2.225 Drop Leaf Tilter See 2.550. fastened from an overhead belt conveyor return idler from the top of a bearing the vertical hanger to the centre of the shaft. of the track to centre line of the Sheave That sheave to which the motive power is connected. con-



from the bottom

or polygonal rim type of wheel around which cable, chain, belt, or 2.226 Drum - A cylindrical A drum may be driven or driving. The face may be smooth, other linkage may be wrapped. grooved, fluted, or flanged. 2.227 Drum Bend Corner (of an en masse conveyor ) - A section of casing to change conveying in which the moving element is carried on the rim of a revolving drum. direction of

belt carcass as the tension 2.220 Duck - A fabric material of woven cotton used in a conveyor bearing medium. Duck is manufactured in several grades and types expressed in terms of weight per unit area. Generally higher longitudinal strength in the duck is provided by having heavier yarns and greater counts in the longitudinal warp threads than the transverse filler threads, 52

�IS:4240- 1984
2,229 Dutchman - A short section of belt, provided with a mechanical which can be removed when take-up provision has been exceeded. 2.230 Duct 2.231 Oust See 2.664. See 2.529. support. out of centre which on a shaft and used to convert is mounted. rotary motion into splice, in a conveyor belt

Seal Gland -

2.232 Ease/ Sfand

A foldable

2.233 Eccentric - A disc mounted reciprocating motion. 2.234 Eccentric Shaft A shaft


an eccentric

2,235 Edge Margin - A narrow strip along each edge of the conveyor belt that is left clear and not used for load carrying. This clear margin prevents spillage by providing an area to contain any load displacement resulting from passing over bend pulleys, trippers, head pulleys and from belt sag between idlers. 2.236 Effective 2.237 Ejector 2.238 Elastic 2.239 Electric are: Chain Pull See 2.336. Not to be confused with 2.615.2.

See 2.253. See 2.598. A form of retardation accomplished by electric means. Typical examples

Stretch Braking

a) b)

resulting Regenerative braking - A form of braking beyond its synchronous speed and consequently acts will exert braking torque. Dynamic braking resulting

when an induction motor is driven as a generator. In this condition, it

i) In a DC motor a form of braking itself through a resistance loop;

from the motor


as a generator the through power

loading supply of

ii) In AC motors this type of braking is accomplished and applying DC excitation to one phase;

by disconnecting used as a brake of devices medium

cl Eddy current
its coil. 2.240 Electric Counter

braking -


A form

of electric


excitation pulses,

An electrical

device or combination

which will attached


2.241 Elevator - Elevating conveyor with buckets or chains. ( See a/so 2.241.4 and 2.163.147. ) 2.241.1 Bag elevator - Elevator parallel endless chains connected lifted by the flight bars and slide leaving the top ( see Fig. 101 ).

as the carrying

to a moving


set at a slight inclination to the vertical and composed of two together by flight bars set at suitable intervals. The sacks are up a smooth surface discharging when they fall forward after



101 BAG



2.241.2Barrel or drum elevator - Elevator with arms fixed to the chains and set at a moderate angle to the vertical. Loading can occur at any intermediate floor but unloading can only occur as the arms pass over the top of the chain sprockets ( see Fig. 102 ). (See a/so 2.163.4, 2.163.136 and 2.173.9. )




2.241.3 Belt elevator


See 2.241.4.

2.241.4Bucket elevator - A conveyor for carrying bulk materials in a vertical or inclinded path and consisting of an endless belt, chain or chains, to which elevator buckets are attached, the necessary head and boot terminal machinery and supporting frame or casing ( see Fig. 103 ). ( See also to )


ELEVATOR Centrifugal discharge be/t and bucket elevator - Elevator, generally totally enclosed, for powder or granular material, consisting of suitably shaped buckets mounted at predetermined pitches on an endless belt. Material is picked up either by buckets in the bottom of the elevator or by feeding the material into the passing buckets and then discharging by centrifugal action whilst or inclined ( see 2.241.4 and, passing over the head ( see Fig. 104 ). It may be either vertical 2.91.2. )



- 1984





ELEVATOR Continuous bucket elevator - A type of bucket elevator where the buckets are set at close pitch ( see Fig. 105 ). The sides of the buckets are made to overlap thus forming a continuous trough, It may be of belt and bucket or chain and bucket type.






the carrying Double leg bucket elevator - A type of bucket elevator having runs enclosed in separate casings between the head and boot. ( See a/so 2.241.4, ) Head bucket elevator See 2.318 and 2.121.

and Internal discharge bucket elevator - A type of bucket elevator having totally enclosed continuous buckets abutting, hinged or overlapping and designed for loading and discharging along the inner boundary of the closed path of the buckets (see Fig. 106). The buckets are normally carried between two chains. The material is fed in at the foot of the elevator and discharge occurs when the buckets are inverted whilst passing over the head sprockets the material being delivered by means of a chute passing through the elevator casing. ( See also 2.241.4. )








�IS: 4240 -1984 Perfect discharge bucket elevator See

A spaced bucket type elevator in Positive discharge chain and bucket elevator which the buckets are maintained over the discharge chute for a sufficient time to permit free graIt normally operates at slow speeds. Arrangement of buckets is vity discharge of bulk materials. such that bucket up end when approaching the discharge point by means of deflecting sprockets ( see Fig. 107 ). ( See a/so 2.241.4. )






ELEVATOR Single common casing. continuously. Spaced

leg bucket bucket

elevator elevator -


A bucket elevator A bucket elevator

having in which

both runs enclosed the buckets

in a single

are not spaced employing Super-capacity super-capacity elevator buckets

- A type of continuous bucket elevator ( see Fig. 108 ). ( See a/so 2.91.11. )

bucket elevator





2.241.5 Can elevator - A vertical conveyor used to upward between guides and an endless pressure belt. 2.241.8 Chain and bucket elevator more chains. The speed is generally 2.241.7 Chain elevator See 2.241.8


a line






- Similar to but having buckets lower than belt and bucket elevators. and 2.241.4.


in one or

2.241.8 Farm elevator - A term applied to any of several conveyors adopted for use on forms to store and move grains, (See 2.183.11,, 2.183.48, and 2.183.119. ) 2.241.9 Finger 2.241 .lO Internal elevator elevator See 2.183.4. See in which '

types of inclined, portable or fixed corn, ensilage and other materials

2.241.11 loop boot elevator - An en masse elevator the form of loop. ( See a/so 2.392 and 2.183.40. ) 2.241.12 Sack elevator 2.241.13 Suspended 2.241.14 Tray elevator See 2.241 .I. See 2.163.135. 2.183.85 See 2.183.4,

the lower

end of the casing

is in

tray elevator

and 2.163.138. in which the elevating element is in the form of a working within the confines of a vertical tube, the 56

2.241.15 Vertical screw elevator - Conveyor solid helix attached to a central rotating shaft

material being elevated through the rotation ( See Fig. 109 ). ( See a/so 2.163.119. ) of the helix normally turning at a relatively slow speed


2.242 Elevator 2.243 Elevator 2.244 Emergency

Boot Cup -

See 2.77 and 2.120. See 2.91.4.

Stop Button at of

conveyor, especially a) An electrical push button located in the vicinity of a passenger public to stop the unit in case each entrance or exit point, to allow the general emergency. b) An emergency stop device which may be applied to any type of power driven conveyor.

- A mechanical and/or electrical device associated with an entrance 2.245 Empty Space Indicator switch used to detect a vacant pusher dog on the main power chain of a power-and-free or in-floor tow conveyor. 2.246 End end. Shaft A shaft used to support the nondrive end of a conveyor screw in a trough

2.247 End Thrust

See 2.247.1,


and 2.247.4. a ball, roller

2.247.1 Ball bearing end thrust - A screw conveyor end bearing unit incorporating or bronze bearing thrust bearing. May be equipped with a drive or end shaft. 2.247.2 Bearing end thrust See 2.247.1. A screw conveyor thrust bearing unit consisting

2.247.3 Bronze bearing end thrust washer and split steel collar.


a bronze a roller

2.247.4 Roller bearing end thrust - A screw conveyor end thrust bearing. May be equipped with a drive or end shaft. 2.248 Entry Tab/e A conveyor which transports material



to the feeding


of a machine. for the

2.249 Equalizing Gear - A gear with a varying pitch diameter designed to compensate varying pitch line velocity of a long pitch conveyor chain as it passes around a sprocket. 2.250 Escalator 2.250.1 See 2.413. escalator See 2.415 and 2.173.7. package conveyor, a device


2.251 Escapement - In a gravity or power operated release of packages one at a time on demand. 57

to permit


�IS :4246 - 1984
2.252 Escort Memory - A mechanical conveyed unit load to furnish automatic 2,253 Exhaoster steam nozzles; 2,254 Exit Table and/or electrical dispatch signals. device of attached venturi to tube or moving with water, with a

producing assembly - A vacuum also mechanical air handling unit. See 512.


air or

2.255 Expansion Joint - ln COnVeYOrS, a joint construction arranged to permit sliding of jointing members, yet providing continuity of support for the conveying medium. Its purpose is to accommodate change in length caused by expansion or contraction, chain slack or take-up movement, 2.256 Face a) The principal frontal surface presenting the greatest area such material, the point at which material is being mined, etc. b) The outer surfaceof a pulley in contact with a belt; drum usually expressed in terms of length dimensions. 2.257 Face Cover 2.256 Fall 2.259 Feed Table See 2.626. See 2.248. the as the face of a pile, of

outer surface

of a gear, roll or

See 2.445.

2.260 Feeder - An apparatus designed to extract or feed and control the rate of flow of bulk material, packages or objects or a device or mechanism which controls, separates or assembles objects. Types of feeders are defined in 2.260-l to 2.260.63.

2.260.1 Apron

form of apron conveyor feeder - Shortened ( see Fig. 110 ). ( See also 2260.11and 2.163.2 ).









feeder associated equipment or bulk

a) Any feeder which operates selectively or synchronously with devices to effect separation or delivery of objects or packages. b) Any feeder which materials. 2.260.3 Bag 2.260.4 Belt Fig. 111 ). feeder feeder operates automatically to maintain

a predetermined

rate of flow of

Any device or conveyor Shortened form of belt

used to separate conveyor

and feed bags, sacks or pouches. running at stow speed ( see



2.260.5 Bifurcating feeder - One which them totwo lanes of movement. 2.260.6 Brake and stop feeder ation and delivery of objects. separates utilizes objects moving in a single lane and delivers to effect separ-

One which

a brake and stop mechanism

endless, heavy duty 2.260.7 Chain curtain feeder - Feeder composed of a series of individual, steel chains hanging from a slowly rotating drum or shaft, their weight controlling the discharge of heavy and large material from a sloping outlet ( see Fig. 112 ).





2.260.6 Chain



See 2.260.11. quadrant gate delivers plate feeder. ( on a weight flight, pan, basis oscillator more )

2.260.9 Chop feeder - A feedei in which a power-operated, swinging material at a predetermined rate. The action is similar to the reciprocating 2.260.10 Continuous weigh feeder - A device which the rateof feed of a continuous stream of material. 2.260.11 Conveyor type feeder ing, screw or vibrating, adapted 2.260.12 Cycle feeder storage lines and delivers 2.260.13 Disc feeder automatically controls

- Any conveyor such as apron, belt, for feeder service. ( See also 2.260. ) and separates groups of time or number.


One which receives them in fixed cycles See 2.260.47.

of objects

from two

2.260.14 Double acting feeder - Two reciprocating and operated through one power source. -A shortened form 2.260.15 Drag bar feeder controlling material from hoppers ( see Fig. 113 ). of

plate feeders scraper

connected used

to operate for

in unison and




113 DRAG


2.260.16 Drum



See 2.260.41. feeder which functions to separate and temperature, sound or matching image. masse' for the conveyor used for extracting spacing of delivery of or and

2.260.17 Electronic feeder - An electronically-controlled deliver objects in response to variations in colour, light, 2.260.16 En masse feeder - Shortened controlling material ( see 2.260.11 ). 2.260.19 Escapement packages. feeder -A form of `en

stop-feeder conveyor


indexing, rate

controlling the material

2.260.20 Flight feeder - A flight handled. (See a/so 2.260.11).

used to control


�IS : 4240 -1984
reciprocates one end of an adjoining hinged hori2.260.21 Hinged feeder - One which vertically zontal conveyor to provide synchronization with the movement of a vertical conveyor during the period required to permittransfer of objects from the vertical to the horizontal conveyor; or from the horizontal to the vertical conveyor. ( See also 2.260.11. ) 2.260.22 Jaw feeder - One which separates and delivers releasing arms to engage the periphery of such objects. 2.260.23 Kick-off nism. 2.260.24 Lifting deliver objects. 2.260.25 Magnetic deliver objects. 2.260.26 Magnetic rating and delivering feeder feeder feeder One which One separates round objects utilizing, holding and

and delivers


by use of a kick-off

mechaand and

of several

types which uses


a lifting to pick

device to separate up, hold separate

Any feeder which One which A and

magnetism magnetized,

roll feeder objects.



rolls for sepa-

2.260.27 Manganese feeder pans are of manganese steel and 2.163.90 ).

type of apron or pan feeder in which the plates or often cast integral with chain linkage ( see 2.163.2, 2.260

of thick steel 2.260.28 Matte feeder - An extremely heavy duty type of apron feeder consisting flights attached to a solid mat of chain links supported, in turn, by closely spaced rollers. 2.260.29 Merging lanes into a single feeder lane. One which consolidates the movement screws of objects from two or more usually in

.2.260.30 Multiple screw feeder - A series a flat bottom bin. ( See also2.163.119. ) 2.260.31 Oscillating feeder See 2.260.11.

of conveyor


side by side,

2.260.32 Paddle wheel feeder -Feeder designed to extract material from a hopper having a longitudinal side slot and a bottom in the form of a shelf. The feeder which travels along the hopper is provided with one or more power driven rotary paddles arranged to extract material from the bottom shelf of the hopper ( see Fig. 114 ).






2.260.33 Pan





One used to feed one object at a time from an accumulation by 2.260.34 Pool-off feeder taking the top or the bottom object from a vertical pile, or the front object for a horizontal stack. 2.260.35 Plate feeder See 2.260.39 and 2.260.47. 60

�IS: 4240-1984
- A feeder in which bulk materials are received from multiple 2.260.36 Proportioning feeder inlets at set rates, not necessarily the same for each inlet, and/or discharge at multiple outlets at set rates, not necessarily the same for each outlet. 2.260.37 Reaction type is vibrated by motion simultaneously. 2.260.36 Reciprocating pushing dogs or flights vibrating imparted beam attached feeder to the An arrangement in which the spring-supported pan and to the counter-balanced reaction objects pan mass

- One which separates and delivers feeder to one or more reciprocating beams.

by means of to

or declined tray or trough 2.260.39 Reciprocating feeder - Feeder composed of a horizontal which low speed oscillations are imparted, usually by crank shaft or eccentric (see Fig. 115 ).

FIG. 115



2.260.40 of objects.




One which


a rocking

motion to effect separation roll or drum which rotates

and delivery to deliver

2.260.41 Roll feeder A smooth, fluted or cleated packages, objects or bulk materials ( see Fig. 116 ).

FIG. 116


2.260.42 Roll-over delivery operations.





up ends or positions






2.260.43 Rotary drum feeder Feeder composed of a low speed horizontal drum, the of which allows a controlled discharge of material ( see Fig. 117 ). ( See a/so 2.260.41. )


FIG. 117





�IS: 4240.1984
2.260.44 Rotary from a conveyor. 2.260.45 Rotary feeder ( See also plate feeder A rotating device 2.260.41. ) See 2.260.47. used to place an object onto or remove an object

carriage travelling parallel to and above a con2.260.46 Rotary plow feeder - A self-propelled veyor, and on which is mounted power-operated rotating arms that plow material from a continuous shelf onto the conveyor below. 2.26047 Rotary tab/e feeder - Feeder composed of a slow speed horizontal circular revolving plate on to which material flows by gravity. A stationary adjustable plough or blade is provided to discharge material from the plate ( see Fig. 118 ).

FIG. 118




2.260.46 Rotary vane vanes forming pockets Fig. 119 ).

feeder giving

- A feeder composed of a horizontal positive extraction and discharge of

rotor provided with radial free flowing material ( see

FIG. 119




2.260.49 Sack




2.260.3. The extracting ( see Fig. 120 ).

2.260.50 Screw feeder - Feeder composed of one or more screw conveyors. element can be of the full-bladed ribbon or paddle type, or a combination of them ( See a/so 2.260.11. )

FIG. 120




�IS: 424011984
2.260.51Scroll 2.260.52Selective feeder feeder See 2.260.11,2.163.119 See 2.260.2 (a). horizontal shaft supporting spaced and

of a rotable 2.260.53Spider feeder - One which consists arms which separate and deliver long and/or flat objects. 2.260.54 Star-feeder See 2.260.46.

- One which utilizes a power-operated 2.260.55 Star wheel feeder spider to effect separation and delivery of circular objects. 2.260.56 Swing arm feeder and delivery of objects. 2.260.57 Switch feeder groups or as single units. 2.260.56 2.260.59 conveyor, Table feeder One One which utilizing utilizes a switch a movable mechanism or swinging





arm to effect separation and deliver objects in

to separate

See 2.260.47. One which utilizes pick-up arms to them to another parallel conveyor. remove sheets from one

Turn-over sheet feeder turn them over and deliver

2.260.60 Vacuum cup and roller slat feeder i A device using vacuum cups to lift sheet to permit rollers on a moving conveyor to pick up, separate and deliver to suit. 2.260.61 Vacuum cup feeder - Any type of feeder material, to hold, support and deliver it. 2.260.62 Vane feeder See 2.260.46. using vacuum cups to pick

one end of a up sheet-like

2.260.63 Vibrating feeder - Feeder composed of a horizontal high-frequency vibrations are imparted either electromagnetically ) ( see Fig. 121 ). ( See a/so 2.260.11.

or declined tray or trough or through unbalanced

to which pulleys



2.261 Feeder and Catcher Table for repeat feeding of metal being

A pair of reversible conveyors, processed through a rolling mill. which discharges between

entry material the

and exit,


provide bucket or used

2.262 Feeder Trap - A trap containing a feeder elevator or other materials handling device, 2.263 Fill-in Plates - Closely powered roller conveyors. fitted plates

onto a conveyor, of



non-powered medium,

2.264 Fixture - A device or attachment fastened to or propelled by the conveying for supporting or securing objects being processed as they are conveyed. 2.265 Flame Cutting a controlled speed carrousel or disc. Tab/e - Any conveyor which supports and conveys metal past a flame cutting head. The table or conveyor usually A sheave that floats axially with or wheel the rope conveyor to provide which

plates or shapes at takes the form of a a fair lead into a

2.266 Fleeting Sheave winding drum.

2.267 Flexible Curve - A flexible section adapted to varying degrees of curvature.

of roller

can be conveniently

63 -


- 1884

belt which takes place as it wraps around the 2.268 Flexing - The bending of the conveyor pulleys. The ply nearest the face of the pulley is under the minimum stress and the ply farthest from the face is under the maximum stress. Flexing stresses increase with a decrease in pulley diameters. 2.269 Flight a) Plain or shaped plates suitably made for attachment conveyor. ( See also 2.269.2, 2.269.3 and 2.269.5. ) b) A term sometimes applied to one conveyor to the series. in a series propelling medium of a flight

in a tandem

2.269.1 Cleanout flight ( of an en masse conveyor ) - A special flight incorporated of standard flights to assist in emptying the casing of material after feeding stops. propelling 2.269.2 Conveyor screw t7ight - The material of angular helix suitable for mounting on a pipe or shaft. 2.269.3 Helicoid flight A continuous one-piece media of a conveyor

screw in the form


screw flight. to provide flight, formed a space from between a circular it and plate,

2.269.4 Ribbon flight - A conveyor screw flight proportioned the internal supporting pipe or shaft when mounted thereon. 2.269.5 Sectional f7ight - A short piece of conveyor screw the axial length of which is slightly greater than one pitch. 2.269.6 U-type conveyor. flight A skeleton flight

in the shape of a flat hottom

`U' used

in an

en masse or forming

2.269.7 Web flight - A flight containing diaphragm surfaces a barrier against flow of materials in an en masse conveyor. 2.270 Floor Conveyor 2.271 Floor Conveyor 2.272 Floor Conveyor 2.273 Floor Conveyor Car See 2.113. See 2.629. See 2.492. See 2.696.

for cleaning

cut casing

Caster Track Rider Plate Wishbone -

2.274 Floor Plates - Plates used as platfrom or walkway floors or as coverings for pits and trenches over which traffic can pass. Usually equipped with irregular ( checkered ) or abrasive to material surface to resist slippage. They are generally removable to permit access to conveying equipment for servicing. 2.275 Flow Rack - A tiered load supporting members. structure with multiple storage compartments which with conveyors as the to

2.276 Fluid Bed Cooler - A device with a perforated deck through fluidize and cool the material being conveyed or processed. 2.277 Fluid Motor a) An electric motor and fluid the motor enclosure; b) A hydraulic 2.278 Folded Edge at the edges. 2.279 Foot motor. A belt construction where the outer plies coupling combination

air is forced

or drawn,

where the fluid coupling

is housed


are folded





See 2.77. See 2.604. The terminal Bolt shaft in the boot of an elevator a structure or en masse conveyor. or machine to a permanent base.

2.280 Foot End 2.281 Foot Shaft 2.282 Foundation ( See also 2.6. ) 2.283 Frame -

A fastener which

for connecting supports

The structure -

the machinery main

components member

of a conveyor. suggesting the

2.283.1 A-frame letter `A'.

A support


or bent, with

set on slopes

supporting 2.283.2 Bend frame - The structure designed to change the direction of travel of belting

the assembly or chain, usually 64

of pulley(s) or sprocket(s) a change of less than 180".

�IS:4240- 1984
2.283.3 Conveyor frame See 2.283. and which conmotive power is head end of a

the drive shaft assembly 2.283.4 Drive frame - The structure which supports tains or supports the motive power, or supports the assembly to which the connected. ( See a/so 2.283. ) 2.283.5 Head frame conveyor or elevator. 2.2836 Snub frame - The structure that supports ( See also 2.283. ) See 2.283.2. The structure Members which which supports the the machinery rollers in components or the terminal machinery

at the

2.283.7 Tail frame a conveyor. 2.284 Frame conveyors. Rails

at the tail powered

end of rollers running



or formed member or members which provide 2.285 Free Rails - The structural surface and support for the load carrying trolleys in a power and free conveyor. 2.286 Friable Easily crumbled or pulverised.

the wheel

rubber and/or elastomeric compound 2.287 Friction - The process of applying nate and bond together the plies of fabric in a belt carcass. The bond strength terms of force necessary to separate the plies of a test piece. ( See also2.150. ) 2,288 Friction, 2,289 Frog Surface See 2.13. junction section of two or more roller or wheel conveyors

used to impregis expressed in

The angular

( see Fig. 122 ).

FIG. 122 FROG 2.290 Furnace Run-out Table See 2.512. paralleling, or in a

2.291 Gallery - A long, nariow, enclosed passageway above the normal grade. Usually enclosing and supporting a conveyor and used as a means of access for servicing. 2.292 Gate - A device regulated. Synonymous 2.292.1Blast gate pneumatic conveyor. 2.292.2 Bucket 2.292.3 2.292.4 Bunker Clam or structure with `valve' A sliding See 2.70. See 2.70. See 2.70 and a gate plate usually used shaped to to fit the lower measured by means of which ( see 2.70 ). valve or a butterfly the flow valve of material to control may the

be stopped air flow


gate gate shellgate

2.292.5Curved a screw conveyor 2.292.6Dump materials. 2.292.7 Duplex

slide gate - A slide gate having trough. ( See also 2.292.15. 1 gate A quick acting gate

contour batches

of of


gate -

See A gate having a sliding gate plate that is flat. used for selectively directing material handled.

2.292.8Flat slide gate

2.292.9 Flop gate - A hinged or pivoted plate Usually used with double or bifurcated chutes.


�IS : 4240- 1984
2.292.10Hand slide gate A slide gate actuated by hand without loading mechanical a skip slide advantage.

2.292.11Loading gate - A gate or measuring by the weight or movement of the skip bucket.

chute for

bucket that is controlled cuts through the

A type of gate in which 2.292.12Overcot gate stream of material from the top when closing. 2.292.13Pneumatic conveyor rotary gate -

a straight

or segment

See 2.507. through the or shut off

segment operating 2.292.14 Quadrant gate - A type of gate in which a cylindrical arc of a circle forms the mechanism by which the flow of material may be controlled completely.

cylindrical seg2.292.14.1 Double quadrant gate - A type of quadrant gate in which parallel ments rotating in opposite directions through the arcs of circles form the mechanism by which the flow of material may be controlled or shut off entirely (see Fig. 123). The two segments are connected by means of gear segments or linkage so that both may be actuated simultaneously by a single operating lever, handwheel or other mechanism.





2.292.15Rack and pinion gate - A gate in which and pinion gear set ( see Fig. 124 ).

the gate

plate is operated

by means

of a rack


124 RACK



GATE Rack and pinion plate. Rack and pinion

curved slide gate flat slide gate -

A rack and pinion



a curved


A rack and pinion

gate having

a flat gate plate. the flow of mate-

2.292.16 Regulating gate - A gate used to vary size of opening rial through the opening. ( See a/so 2.70. ) 2.292.17Skip hoist loading gate 2.292.18Slide gate 2.292.19 Swinging See 2.292.11.

so as to control

A type of gate in which gate -

the gate plate slides

in guides.


See 2.292.12.

beneath 2.292.20 Tunnel gate - A bin gate or bin valve usually arranged In a series in a tunnel a storage bin, bunker, or pile and used for the purpose of loading a belt or other type of conveyor, a straight slide or a cylindrical 2.292.21Undercut gate - A type of gate in which through the stream of material from the underside when the gate is closing. segment cuts

the flow 2.292.22 Vertical slide gate - A gate usually of the overcut type in which member is a straight slide actuated by a lever, a rack and pinion or other mechanism. 2.293 Gate p/ate Gate. The plate used for opening, restricting or closing the passageway

controlling in a Valve or

2.294 Gate Section - See 23.28. of a conveyor 2.295 Gauger Table - The combination cutting length at a shear In a metal processing line. 66

and any


to stop and



�18 I 4240-1984
2,296 Goose Neck Hook or heat shield protection. A `C' hook for trolley conveyors which provides clearance for drip pan

decline in terms of degrees from the horizontal; percent of rise 2.297 Grade - The rate of inclineor to the horizontal distance: or in millimetres of vertical projection per metre of horizontal projection. Also refers to the grade of cover used in conveyor belt. ( See a/so 2.298. ) 2,298 Grade. Line The base line from which See 2.297. elevations are measured. 2.299 Gradient 2.300 Grating

a) b) c)

A coarse screen made of parallel or crossed bars to prevent passing of oversized material. A series of parallel and crossed bars used as platform or walkway floors or as coverings for pits and trenches over which traffic can pass. Generally are removable to permit access to conveying equipment for servicing. A series of parallel and/or crossed bar units fastened to or propelled by the conveying medium, used for carrying large lump-size bulk material or objects. Usually used to permit passage of air for cooling or heat to maintain temperature. Tube in which loose bulk material is lowered vertically by gravity, for loose bulk is important to the conveyor

2.301 Gravity fall tube

2.301.1 Gravity fall tube equipped with retarding devices - Gravity material equipped with braking stops or baffels used when the reduction prevent breakage. 2.302 Gravity Feed Trap - A trap over the tail end of a belt belt as a five bottom under the opening in its top. 2.393 Grit Collector solids from settling and 2.173.10.) conveyor

type tube of velocity utilizes


of any of several types of conveyors used for removing heavy - An adaptation tanks or basins (see Fig. 125 ). ( See also 2.241.4, 2.163.48,, 2.163.110



2.304 Grizzly - A device for the 2.140.7 and 2.304.2 ).








( see 2.304.1,

2.304.1 Bar grizzly - A series of spaced bars, rails, pipes, or other members sizing of bulk material passed across it to allow smaller pieces to drop through Fig 126 ).

used for rough the spaces ( see



and scalping 2.304.2 Live roll grizzly - A device for screening spaced rotating, parallel rolls so constructed as to provide openings 67

which consists of a series of of a fixed size ( see Fig. 127 ).

�IS : 4240 ;



2.305 Grout - A mixture of mortar through a restricted opening. 2.306 Guard a) A covering or barricade


of water,

sand and cement sufficiently

thin to flow

for safety


such as gear guard, and chain

guard. below

b) In connection with a trolley conveyor, a structure usually of steel mesh, mounted the conveyor path on high conveyors to protect personnel below. c) Frame member 2.306.1 Backing spiral chute. of any conveyor An auxiliary which confines or guides the load being conveyed.

guard -

guard attached

along the inside

of the shell of an enclosed chains for safety purposes.

2.306.2 Chain guard - A covering or barricade for drive or conveyor May enclose fully or only guard at the points of danger. 2.306.2.1 Lubricating chain guard See 2.119.2. for a gear train

2.306.3 Gear guard - A covering or barricade fully or only guard at the points of danger. 2.306.3.1 2.307 Guide a) The tracks that support and determine Lubricating Gear guard -

for safety


May enclose

See 2.119.2.

the path of a skip bucket and skip bucket bail, of a bucket elevator. which limits the conveyor or

b) The tracks that guide the chain

or buckets

c) The runway or members paralleling the path of the conveyor parts of a conveyor to movement in a defined path. 2.306 Guide Angle 2.309 Guide Rails Guides made of angle iron.

See 2.307. conveyor on which a feeder places glued labels for

2.310 Gummer Table - A rotary table or belt hand application. Used in packaging lines. 2.311 Guy - A rope, chain, 2.312 Hand cable,

rod or shape applied

as a tension


used for steadying,

a) The right hand or left hand of a conveyor is determined by facing the direction in which the the hand is determined when the material is flowing. In the case of a reversible conveyor, material is flowing toward the drive end. b) In a screw conveyor a right hand screw when rotated clockwise will move material toward the observer, a left hand screw when rotated clockwise will move material away from the observer. A trolley 2.313 Hand Pushed Monorail trolleys and loads are pushed by hand. type conveyor without a propelling medium where the


�IS:4240 - 1984
2.314 Handrail a) As used with moving walks either a stationary rigid handrailing or a moving flexible handrailing travelling at the same speed as passenger conveyor surface, either type being used for passenger hand support. b) Any safety railing for the protection of personnel around platforms, pits, stairways, below the above. etc. point at

2.315 Hanger - A type of bearing housing or frame which supports the shaft which the hanger is attached to the conveyor frame, trough or other structure. 2.316 Hanger Steel 2.317 Head Angle iron or rods by which a conveyor

is hung from supports

See 2.318. Usually the ultimate delivery end of a conveyor. at the shaft ultimate delivery end of a conveyor. Not always ( See the The frame or structure conveyor terminal

2.316 Head End 2.319 Head Section also 2.121. ) 2.320 Head Shaff drive shaft. 2.321 Head Sheave


at the head end of a conveyor.

a) A sheave mounted b) In a skip hoist,

on the head

shaft of a conveyor. end over which the hoisting a workable rope passes. arrangement of some

the sheave

at the discharge

2.322 Headroom - The vertical distance needed to make possible specified piece of equipment or portion thereof. 2.323 Helical Runway See 2.140.17. See conveyor track

2.324 Herringbone

Table -

2.325 Hinge Track - A portion of over-and-under wheels to pass under or over. 2.326 Hinged Section - Hinged section, inserted through the conveyor track. The hinged section upward tilting ( see Fig. 128 ).


to pivot,

allowing a clear facilitate

truck way the

in a roller is normally

conveyor, to produce counterbalanced to

FIG. 128 HINGED SECTION on a portable conveyor truck 2.327 Hitch - The attachments made for towing the conveyor by external motive power. 2.328 Holdback See 2.26 and 2.490. tilting attachment on chain to prevent object being towed medium working or carriage by which connection is

2.329 Holdback Dog - Counter-balanced from running away on down grades.

to runway to prevent conveying 2.330 Holddown - Member located above and parallel Usually located so as to allow normal from picking up off the runway due to tension. clearance for conveying medium. 2.331 Hood See 2.122. in size,

bottom, or a bottom, reduced 2.332 Hopper - A box having a funnel-shaped nacked to receive material and direct it to a conveyor, feeder, or chute. 2.332.1 Feed hopper See 2.332. 69



�IS : 4240 - 1884 2.332.2 Gravity hopper - A surge bin attached utilizes the conveyor belt as a live bottom. to the tail end of a portable conveyor which

2.332.3 Loading hopper - A hopper used to receive and direct material to a conveyor. 2.332.4 Receiving hopper - A hopper used to receive and direct material to a conveyor. 2.332.5 Surge hopper - A form of storage container used as a part of a conveyor system at any point where there is necessity to substantially vary the rate of flow of the material such as a change from intermittent flow to continuous flow and vice versa. A surge hopper will receive and hold any material discharged from another conveyor or from a process machine while delivering it at a different rate to another conveyor or to another machine. Some form of feeder is often necessary to discharge a surge hopper. 2.332.6 Track hopper - A hopper located below the level or railroad from railroad cars; the material in turn is taken from the hopper ( see Fig. 129 ). tracks to receive material by a conveyor or feeder



2.333 Hopper Scale - A scale designed for the weighing of granular materials in bulk,,whose receiving element is a self-cleaning hopper with an outlet gate. ( See also 2.333.1.) 2.333.1 Automatic hopper scale - A hopper drafts of predetermined weight value. 2.334 Horizontal Belt Curve the direction of travel. A curved scale which section automatically equipped discharges


and counts belt to change plane by a

belt conveyor

with a curved on

apparent area, shape or line cast 2.335 Horizontal Projection -The structure or other unit actually supported at an angle to the horizontal.

a horizontal

2.336 Horsepower Pull - The effort necessary to maintain the normal operating speed of a conveyor under a rated capacity load. To this should be added the effort of acceleration, drive losses, etc, to Horsepower pull may be referred to in terms such as effective arrive at a final driving effort. tension, chain, pull, turning effort, gear tooth pressure, etc. ( See a/so 2.615.3. ) 2.337 Humper 2.336 Idler a) pulley, sheave, sprocket, or wheel around direction of travel. ( See also 2.466.16. ) b) A belt supporting roll or rolls. support the belt of the with a stationary part. actuated conveyor swivel or direct which a belt, cable or chain passes in changing See 2.163.14.

2.336.1 Be/t idler - A roll or series of rolls which ( guide ) its path to prevent it from coming in contact

2.338.2 Belt training idler - A belt idler which by means of a belt controls the side runout of the belt within limits ( see Fig. 130 ).


FIG. 130




�IS :4249 - 1984
2.338.3 Carrying idler the belt idlers upon which the load-carrying portion while of belting is

a) In be/t conveyors, supported. b) In live roller 2.338.4 Catenary 2.338.5 Cushion

conveyors, idler idler -

the rolls

upon which

the load is supported

being conveyed.

See 2.338.10. See 2.338.11: a series of spaced discs in place of

2.338.8 Disc idler - A type of return belt idler incorporating a continuous roller to prevent material build-up on the idler. 2.338.7 Dishpan 2.338.8 position. idler See 2.338.20. An idler consisting of one or

Flat be/t idler -

more rolls


the belt


a flat or in

2.338.9 Guide idler-A pulley, roll or wheel free to rotate and used to limit, guide, confine the conveying or power transmission medium within the limits of a defined path.


belt-carrying idler with ends supported 2.338.10 Hammock belt idler - A type of flexible pivoted stands. The tube or rollers sags under the weight of the load to form a trough. resillient 2.338.11 Impact belt idler - A belt idler incorporating oneumatic tyres springs or other means of absorbing large amounts belt and idler damage at a loading point.

roll coverings, rubber tyres, of shock in order to prevent are in a

belt idler in which the concentrator roller shafts 2.338.12 Offset idler - A troughing vertical plane other than the vertical plane through the shaft of the centre roller or rollers, 2.338.13 Picking conveyor centre roll, used to spread 2.338.14 Return 2.338.15 Return idler idler - A troughed and expose material idler See 2.338.2. the return run of the belt. belt idler with short for picking. concentrator

rolls and a long

belt training

A flat idler supporting idler idler See 2.338.2. See 2.338.2. A troughed plane. belt

2.338.18 Self-aligning 2.338.17 Self-training

2.338.18 Single plane idler shafts are in the same vertical


in which

concentrator roller





2.338.19 Spiral idler - A type of return belt idler utilizing used when material is expected to adhere to the return run. 2.338.20 Spool idler a) A belt idler made up of a series b) A belt idler with loosely-mounted with flat centre idlers. 2.338.21 Training Idler See 2.338.2. of spaced tapered

a spiral

to support

the belt, It is

tires. concentrator

.. rolls



on a common


2.338.22 Transition idler - A troughed belt idler having a lesser degree of trough than the carrying idlers of the conveyor and used to support the belt as the trough changes as the belt moves to and from the terminal pulleys. 2.338.23


belt training



See 2.338.2. to turn up the

of two or more pulleys arranged 2.338.24 Troughing idler - A belt idler consisting of the belt so as to form the belt into a moving trough ( see Fig. 131 ).






�IS :4240 - 1984
2.33925 Two plane idler - A troughing belt idler in which the concentrator vertical plane separate from but parallel to a vertical plane through the shaft rolls. This permits the concentrator rolls to overlap the centre roll. 2.338.26 Weight idler The conveyor idler mounted on the carriage position roll shafts are in a of the centre roll or scale.

of a belt conveyor on certain

2.339 Idler Disc - A device loaders. ( See also 2.385.2.1. 2.340 Idler 2.341 Idler, 2.342 Idler 2.343 Idler, 2.344 Idler 2 345 Inching 2.346 Indexing 2.347 indicator 2.348 Inlet conveyor. 2.349 Inside A Gear Pulley Shaft Sheave Wheel -

used for holding ) transmits

the belt in proper power from

types of box car

A gear which

one gear to another.

See 2.338, 2.468 and 2.468.16. A draft which See 2.338. See 2.338. supports an idler wheel, pulley, etc.

See 2.356. Controlled spacing or feeding. ( See also 2.260.19. or condition into ) component of tubes or material. in a pneumatic trough. rolls.

A device to show the position device End to permit A trough insertion

of a remote the system inside

of carriers


end designed conveyor levelling

for attachment for transferring features. trough fitted with

a screw conveyor between

2.350 Intermediate Carrier ( See a/so 2.163.2. ) 2.351 Jack 2.352 Jacketed hollow wall. 2.353 Jack/adder 2.354 Jackscrew and maintaining screw. 2.355 Jackshaft An adjustable Conveyor -

An apron support -





A conveyor conveyor

an additional


to form


A type of chain

to take logs from a flume.

A horizontally or vertically-mounted screw used for the purpose of adjusting adjustments for alignment of a machine part. Also used in place of a take-up See 2.177. repeated closure of an electric circuit to start small movements of the driven machine. a motor from rest and for

- The quickly 2.356 Jogging the purpose of accomplishing

2.357 Journals - That portion of rotating shaft or axle which turns supports the load imposed by weight, chain or belt pulls, gear tooth 2.358 Journal 2.359 Kicker a) A unit that automatically discharges a package may be dislodged selectively or continuously. or object Box See 2.43.

within a bearing pressure, etc.


from the conveyor.

The packages trolley component and for

b) A mechanical or electro-mechanical device that propels a power-and-free carrier from a stop into the main line to engage a pusher dog. 2.360 Knee Brace - A structural the purpose of providing vertical 2.361 Knockover 2.362 Knuckle Dog Joint See 2.624. See 2.379.12. brace at an angular support. position to another structural

2.363 Knuckle Shaft - A bend shaft usually equipped with an idier wheel conveying medium for abruptly changing the normal path of the conveying complete inversion for discharge or to accomplish a clearance. intricate 2.364 Labyrinth Seal - A type of seal incorporating from entering ball or roller bearings and to retain lubricant. 2.365 Landing - The stationary stairway, consisting of a take-off platform at each lip and a threshold 72 entrance plate. passage or exit to point

of a type related to the medium to effect a more prevent of foreign matter walk or

a moving

�IS : 4240-1984
2.366 Lane - The width of a passenger conveyor passengers in single file. 2.367 Lap Changer 2.368 Larry A device for reversing or its stationary approaches, needed for a line of

the lap on pivoted


See 2.368.1.

hopper for receiving, weighing or measuring and distributing 2.368.1 Weigh larry - A travelling or of the bulk materials ( see Fig. 132 ). Usually fitted with a scale, either manually-operated automatic recording type. Weigh larries may be suspended between overhead tracks, or carried on rails mounted below them. They may be hand-pushed or power-propelled, and some design provide a riding platform or cab for the operator. A remote control device for operating the bunker or bin gates is usually mounted on the larry chassis.

FIG. 132



2.369 Leg - A term sometimes leg bucket elevator.


to a centrifugal the head end and

discharge boot of

bucket elevator. a bucket elevator


a double the

2.370 Legging - The casing between carrying or return runs or both. 2.371 Leveler See 2.650.1.


2.372 Lift - The net vertical conveyor or bucket elevator. 2.372.1 Finger lift 2.372.2 Fixed tray lift





is moved





See 2.163.4. 2.163.4. of passenger conveyor consisting on its outer surface for transporting

2.372.3 Man lift - A type projecting steps and handles elevations. 2.372.4 Reciprocating 2.372.5 Screw lift 2.372.6 Suspended 2.373 Lift-and-Turn 2.374 Lifting Blade lift


a vertical passengers

endless between

belt with different


See 2.241.15. tray lift See 2.163.135. device for metal coil which lifts, turns and lowers.

Unit -

A type of transfer

See 2.146.

and located as to effect control for limit of travel, 2.375 Limit Device - A device so constructed degree or to cause actuation, reversal or stoppage of equipment in operation or to be operated. 2.376 Liner 2.377 liner A replaceable member used for purpose of absorbing wear.

Plates -

See 2.682.

2.378 Lining 2.379 Link -A

See 2.659 and 2.526. chain unit of one pitch See 2.379.2. length.

2.379.1 Block link 2.379.2 Centre link a) The inner holes. b) The loop-shaped pins.

link of a straight links of


bar chain chain

containing which




or bushings surfaces

or pin for the



the bearing


�IS: 4240 - 1984
2379.3 2.3794 2.379.5 Coupler Inside Offsef link link A link designed See 2.379.2. link A coupler link made in the form of an offset offset to provide link. a centre pins, link constructhe side bars for more readily connecting sections of chain,


2.379,.6 Offset link - A link, the side bars of which are tion at one end and outside link construction at the other.

2.379.7 Outside link - A link, consisting of two straight side bars and of which are the outermost side bars when assembled into the chain. 2.379.6 Pin link 2.379.9 Pink 2.379.10 An outside outside A chain See 2.548. with a pivot between of contact link of a straight link. link having rollers mounted side bar chain.


link -An link -


on the two bushings.

2.379.11 Side links

2.379.12 Swivel link - A chain link provided at a right angle to the normal chain joint. 2.360 Live Bearing Area relative to each other. 2.381 Live Bearing 2.382 Live Storage Pressure The projected

the pitch two





between area.


in motion

The load divided

by the live bearing

a) Storage on a suitable designed power operated conveyor, conveyor or other combinations upon which accumulated as other loads are removed from the discharge end. b) That storage of bulk material for immediate current use. 2.383 Load Bar A device in the upper portion

power and free conveyor, roller packages or objects can advance or bin which is available

of a silo, bunker,

to distribute

a load over two or more trolleys.

to the applied weight or 2.384 Load Cell - A device which produces an output signal proportional toad. The load cell may utilize any physical principle included in the field of, but not limited to, electricity, electronics, hydraulics, magnetics, mechanics and pneumatics, or combinations thereof. 2.385 Loader inclined bucket elevator for loading 2.385.1 Bucket loader - A form of portable, self-feeding, bulk materials into cars, trucks, or other conveyors ( see Fig. 133). ( See also 2.241.4 and 2.163.99. )




2.385.2 Car loader


See 2.385.2.1

and 2.163.68.

adapted by portable or hinged 2.385.2.1 Box car loader - Any of several types of conveyors mounting for use in loading bulk materials or packaged materials into box cars. Some types operate at high speeds and throw the materials to the ends of the car ( see 2.163.99 ). 2.385.3 Coil loader - A mechanical objects into an adjacent conveyor. device for loading coils of metal strip and other annular

or semiautomatic machine, consisting of synchronized 2.385.4 Pallet loader - An automatic conveyors and mechanisms to receive objects from conveyor(s) and place them on to pallets according to a prearranged pattern ( see Fig. 134 ).






2.385.5Palletless Loader - An automatic machine, consisting of synchronized conveyors mechanisms to receive objects and arrange them automatically into a unit load in accordance a predetermined pattern. 2.385.8Snow loader See 2.385.1and 2.183.100.

and with

2.385.7 Top loader - A movable, inclined belt conveyor equipped with a tail end trap and used for loading hauling equipment, It is normally fed by bull dozers pushing material over the trap. 2.386 Load indicator is pulling. A device mounted on a floating drive to indicate amount of load the drive

2.387 Loading cycle - The number of times per given unit of time that a given point on the conveyIt is usually expressed in terms of minutes required by a ing medium passes the loading station. given point to make a complete circuit of the conveyor. 2.388 Loading Leg - A chute enclosing the front and/or sides of an elevator bucket line and used to guide material into continuous elevator buckets. 2.389 Loading Plate - In vertical conveyors of the opposed shelf type, a plate on which the load is deposited and from which it is removed by a pair of shelves ( see 2.209). 2.390 Loading Shirt - See 2.561. 2.391 Log Washer - See 2.163.88 2.392 Loop Boot with a feed inlet. The lower and 2.527. of a loop-boot en masse elevator comprising a loop of casing between two slows down. material into of a


roller, wheel or other 2.393 Looping Table -A metal strip processing units over which the strip 2.394 Lug See 2.172. An electrical device 2.395 Magnetic De'tector a definite area.

suitable type of conveyor can loop when the forward for indicating with means the entry of for lowering

located machine magnetic

2.396 Marine Leg - A self-feeding bucket elevator vessel ( see Fig. 135 ). ( See a/so 2.241.4. )

it into the hold





�IS:4240 - 1984
2.397 Materials Handling

a) The art and
tOOlS; the


._ movement, within


and storage of substances

in any form.

b) The movement

an establishment; the handling of raw materials end between operations and in stores, of finished products and of the scrap, cutting oils and process machinery, the movements of work people in relation to the handling of material.
rllOVef?lellt Of COITIpOnentS

Of everything

2.396 Maximum Angle of Inclination - The maximum `angle at which a conveyor may be inclined and still deliver a predetermined quantity of bulk material within a given time. As the maximum angle is approached the rate of handling of bulk material is usually decreased. For package conveyors the maximum angle of inclination is that at which packages or objects may be conveyed without a slippage. ( See also 2.150. ) to operate 2.399 Memory System - Signal carrying media positioned the automatic routing of unit loads to predetermined destinations. a sensing device for use in

2.400 Mildew Resistance - The ability of a conveyor belt carcass to withstand mildew deterioration. This is accomplished by application of a chemical treatment to the fabric or cords, which inhibits the mildew growth. 2.401 Mill Table Any type of conveyor See used to connect two machines in a metal rolling mill.

2.402 Mingler

and time allowed to accelerate a conveyor from rest starting tension established by the belt manu-

2.403 Minimum Accelerating Time - The minimum t3 normal speed without exceeding the permissible facturer for the particular belt used.

2.404 Minimum Braking Time - The minimum time allowed to decelerate a conveyor belt from normal speed to rest without exceeding the permissible braking tension of the belt or causing festooning of the belt. 2.405 Mixer, 2.406 Mixing Screw See carriers are automatically relayed from the one loads

Paddle - See 2.427. where 2.407 Monitor - The main group of terminals line to another in a pneumatic conveyor system.

of loads without bringing them to a stop on 2.406 Motion Weighing - The weighing receiving element of a scale such as the weighing of freight cars on a grade track scale. 2.409 Moulded Edge it is known as moulded 2.410 Moving In belt construction edge construction. Table when belt edge is sealed with elastomeric


Pan Inspection

A packing on

house term for a pan conveyor. a substantial slope for transporting passengers

2.411 Moving Ramp - A moving between different elevations. 2.412 Moving Sidewalk -

walk set

See 2.415. conveyor in which the passenger carrying surfaces

2.413 Moving Stairway - A type of passenger form stairs where the travel is on a slope. 2.414 Moving Top Tab/e A packing

house term applied

to pan, slat, apron and belt conveyors.

2.415 Moving Walk - A type of passenger conveyor on which passengers stand or walk and in which the passenger-carrying surface remains parallel to its direction Of motion (see Fig. 136 ). 2.416 Muller 2.417 Newel belt surface. See That

of the balustrade

of a moving





the moving

2.416 Nip Point - Points in a conveyor where body limits are clothes of conveyor may be trapped causing injury to the person(s). 2.419 Norway Bolts Bolts with special heads used to secure buckets

of the persons or flights tube

in the vicinity

to belts.

2.420 Nozzle - A fitting applied of material into the air stream.

to the intake end of a pneumatic






FIG. 136



2.421 Offsef 2.422 Oiler -

Side Bar A device Trough

A side bar of an offset link. supplying End controlled end lubrication. designed for attachment to a screw conveyor trough

2.423 Outside flange.

A trough

equipment designed 2.424 Overload Release - A mechanism or electrical equipment from the motive power in the event of overload on conveyor. 2.425 Packing Scale - A scale which material has been weighed.

to disconnect after a definite for

the driven amount manual of or


cuts off


feed a pack

2.426 Pack Tilter - The mechanism on a conveyor for inclining removal of the pack or individual sheets.

of sheets

2.427 Paddle - A flat, contoured or shaped blade having suitable means for mounting on or attachment to a pipe or shaft in a fixed or adjustable position with respect to the shaft axis. 2.426 Paddle 2.429 Pallet a) A flat or shaped wheelless load carrier of a pallet conveyor. are placed. as required pallet loads, It is usually by a pallet designed loader SO Mixer See

b) A portable platform on which packages or objects that it can be picked up with a fork-lift truck. 2.430 Pallet Dispenser machine or operation. 2.431 Pallet 2.432 Pallet A device for feeding empty pallets tiered pallet

or other

Load Detierer load Tierer

A device for separating A device for stacking full

loads for storage.

2.433 Palletizer 2.434 Pan -

See 2.365.4.

See 2.14.2. pan in which mixing paddles or blades revolve about a

2.435 Pan Mixer -A horizontal, circular central axis to mix batch ingredients. 2.436 Pan Side See

2.437 Partition P/ate - The common run of an en masse conveyor. 2.436 Picking Table See 2.163.93.

Wall between

the carrying

and return


of a combined

2.439 Pier - In a foundation for a conveyor structure, surface level in which anchor bolts may be imbedded. 2.440 Piler See 2.590. 77

it is that part raised




�IS : 4249- 1984
2.441 Piler Table 2.442 Pillow Block parallel to the shaft. A conveyor for stacking sheets in a rolling a flat mill. mounting surface offset fro! but

A bearing block.or housing having ( See also 2.442.1 to 2.442.8. )

2.442.1 Angle pillow block - A split sleeve bearing pillow block in which the plane of the split between the cap and base is at an angle to the plane of the base ( see Fig. 137 ).





2.442.2 Antifriction pillow friction bearing such as ball, 2.442.3 Babbiffed pillow

block - A pillow block in which the bearing roller or needle bearings ( see 2.442 ). A pillow block having a babbitted bearing



an anti-

block -

( see Fig. 138 ).

FIG. 138 BABBITTED 2.442.4 Ball bearing pillow block A pillow



block utilizing block having


as a bearing bearing.


2.442.5 Bronze bearing pillow

block -

A pillow

a bronze

2.442.8 Gibbed pillow block - A split sleeve bearing pillow block in which the plane of split is parallel to the base and whosecap is lipped to fit snugly into the base thereby eliminating side stra_in cn the cap bolts as weil as effecting a more nearly perfect alignment of cap to base. 2.442.7 Plain bearing bearing. pillow block block A one piece A pillow pillow block rollers in which a bored hole element. forms the

2.442.8 Roller bearing pillow 2.443 Pin See 2.443.1.

block using

as a bearing

2.443.1 Chain pin -The about which the links pivot. 2.443.2 Extended pin 2.443.3 Master pin -



is used extends





and upon



A pin which


the chain on one or both sides. rivetless chain. Usually placed

A type of coupler

pin used for joining

2.443.4 Ring pin - A forged adjacent to a trolley for towing

chain pin having a ring arrangement on one end. floor trucks by means of a chain hitch. dolly, or cart used

2.443.5 Tow pin - A movable or fixed member on a truck, ing or pulling dog on a floor mounted tow conveyor. 2.444 Pit 2.445 Pitch A hole, recess, or well below the normal

to engage a push-

grade or base floor.

a) The amount of vertical drop in one turn ( 360" ) of a spiral. drop in a given unit of length of roller or wheel conveyor. b) In chain, the distance between the centres of two successive 78

Also chain

the pins.




�IS : 424011984 cl In a conveyor screw f7ight, the distance
measured flight. axially. Normally between identical points on adjacent flight surfaces this pitch is approximately equal to the outside diameter of the the carcass, at

d) The conveyor

belt pitch line is a horizontal plane located centrally in for computation purposes all belt tension is theoretically carried. and gears it is the distance teeth. See 2.43.2. measured on the pitch circle

e) In sprockets
of adjacent


the centre

2.446 Plate Hub Box -

2.447 Plough - A blade, either fixed or mounted on a movable the run of the loaded belt to discharge the material by deflecting than the head of the conveyor. 2.446 Plow - A device positioned bulk material (see 2.201 ). across the path of a conveyor discharging material

carriage placed obliquely across it from the belt at points other at the correct from a flat angle to discharge or both

2.446.1 Belt plow - A bladed device for sides at some intermediate point. 2.449 Ply A layer of duck or cords

belt to one belt.

used in constructing

the carcass

of a conveyor

2.449.1 Maximum plies - The greatest number of plies in the carcass of a rubber conveyor belt which can be used without seriously reducing the transverse flexibility of the belt thereby limiting its ability to conform to the troughed contour of the idler, and resulting contact against all of the supporting rolls. ( See a/so 2.660. ) 2.449.2 Minimum plies - The least number of plies in a carcass of a rubber conveyor belt for a given iidth and weight of duck to provide sufficient support strength in the belt, both laterally and longitudinally to limit excessive sag between idlers and to resist impact splitting. of rubber conveyor belt of uniform thickness which 2.449.3 Reverse step ply - A construction has a thicker top cover at the edges. This is accomplished by stepping down the top plies from the centre to each side, and filling in the extra spaces at the edges with cover stock. 2.449.4 Step ply -A construction of rubber conveyor belt of uniform thickness which has a thicker rubber cover at the centre. This is accomplished by arranging more plies at the sides of the belt than in the centre. Usual constructions are 5 by 4 ply or 6 by 4 ply and in each case filling in this extra space with cover stock. 2.450 Ply Adhesion - The permanancy and strength of the bonding carcass of a rubber conveyor belt resulting from proper correlation friction and skim coats, the impregnation of the fabric and the curing expressed in terms of the mean force per unit width of ply required to ( See a/so 2.267 and 2.556. ) together of the plies of the of the compounding of the of the conveyor belt. It is strip one ply from the next. of a

2.451 Ply Arrangement - The construction of the laminated pattern of the plies in the carcass conveyor belt. Usual arrangements are folded edge construction, straight edge and step ply. maximum recommended 2.452 Ply Rating -The expressed in force per unit width per ply. working tension for various types of


of the ultimate breaking strength of a ply used in the carcass of 2.453 Ply Tensile - Measurement a conveyor belt expressed in force per unit width of ply. Permissible working tension in the ply of a specific belt is determined taking into account factors of safety and service conditions, such as, type of takeup, joints and starting loads. 2.454 Pneumatic 2.455 Pneumatic Conveyor Conveyor Sending Windgate Box See 2.517.

See 2.292.1. adjusted support. and size

2.456 Pony Support

A single,


2.457 Portable Screening P/ant - A self-contained unit consisting of equipment to screen aggregates, mounted on a portable chassis capable of being towed over-the-road. 2.458 Pouring Walk See 2.415 and 2.173.7. pump or compressor conveyor. 79 which supplies air

2.459 Power Plant - A blower, exhauster, below atmospheric pressure to a pneumatic

at above


or formed member which provides 2.460 Power Rail - The structural trolleys which guide and carry the powering chain in a power-and-free 2.461 Power-and-free release single trolley 2.462 Power-and-free trolleys. 2.463 Power-and-free trolley. Conveyor Escapement upon signal. Conveyor Conveyor free Free Rail -A A device to stop section the track and support conveyor. trolleys on a free supporting rail for and the to


of track

the free

Trolley Stop -








stopping with


2.464 Power-and-Free Conveyor Hoist Unit - A section Of free trolley track equipped ting or lowering unit for transferring a loaded trolley from one elevation to another.

a hois-

2.463 Power-and-Free Conveyor Stop and Feeder - A device on a free rail for stopping the trolley and then providing a positive pushing force for moving the trolley forward at a given signal. 2.466 Printing 2.461 Pug Mill Device A device for imprinting weight information on a ticket or chart.

See but sometimes polygonal in cross section and having

2.468 Pulley - A wheel usually cylindrical its centre bored for mounting on a shaft. 2.468.1 Bare pulley 2.468.2 Bend pulley A pulley which

does not have the surface the direction equally

of its face covered of the travel

( or lagged


Any pulley

used to change

of the belt. the centre,

2.468.3 Crown face pulley - A pulley which the diameter being greatest at the centre. 2.468.4 Dead shaft pulley shaft ( See also 2.198. ) 2.468.5 Double arm pulley 2.468.6 Drive pulley which it is in contact. 2.468.7 Electromagnetic 2.468.8 Guide pulley 2.468.9 Head pulley A pulley with




ends toward

a bearing

in the hub and rotating

on a stationary

A pulley

with two sets of spokes on one or two hubs. on the drive shaft that transmits power to the belt with

A pulley mounted pulley -

See 2.468.11.

See 2.338.9. A pulley mounted on the head shaft of a conveyor. a material purposes. to

2.468.16 Lagged pulley provide for greater friction

A pulley having the surface of its face covered with with the belt or to provide a resilient surface for cleaning a permanent electromagnet from the conveyor.

2.468.11 Magnetic pulley - A pulley equipped with tramp iron from the bed of material as it is discharged 2.468.12 Permanent magnet pulley See 2.468.11.

used to remove

or pneumatic face used at the drive 2.468.13 Pressure pulley - A pulley with a resilient of a belt conveyor to increase the traction between the drive pulley and the belt. 2.468.14 Single arm pulley 2468.15 Slatted pulley A pulley with a single set of spokes and hub. of axial slats. a belt drum.


A pulley


a face made up of a series

2.468.16 Snub pulley - Any pulley drive pulley. ( See also 2.468.2. ) 2.468.17 Straight face pulley -

used to increase on which

the arc of contact

between cylindrical

and the

A pulley mounted

the face is a straight

2.468.18 Tail pulley -

A pulley

at the tail end of a conveyor. on the takeup shaft. pulley with three sets of spokes mounted on one or

2.468.19 Takeup pulley 2.468.20 Triple three hubs. arm

A pulley


pulley -

A conveyor


�IS: 4240.1984
spaced 2.468.21Winged pulley - A type of pulley in which the face consists of circumferentially surfaces supported on radial vanes which intersect two cones set base-to-base whose apexes Used to prevent trapping material on the face of coincide with the centre of the supporting shaft. the pulley which might damage the belt, or where material may tend to build up on the face of the pulley. 2.469 Pulley Face See 2.256. controls usually movement of metal plates or takes the form of a carrouse contacts the object being

which supports and 2.470 Punch Table - Any conveyor The table or conveyor shapes at a punching machine. or disc. 2.471 Pusher Dog towed or pushed. A projecting lug type of chain



2.472 Push-Out P/ate-of an en masse conveyor - A stationary sloping plate opposite outlet to push the conveyed material out so as to obtain a more positive discharge. 2.473 Rail a) One of the longitudinal b) The supporting c) The supporting 2.474 Rail Chair surface members in a conveyor frame. of a chain conveyor.

the discharge

under the wheels

or rollers

track for a belt tripper. used to support the track rails of a conveyor for ends clamping of tripper a movable or or tripper. or belt rails conveyor to limit

A pedestal

or device 2.475 Rail Clamp - An attachment tripper to the rail to hold it in a fixed location. 2.476 Rail the travel. Stop A stop mounted at the



conveyor medium

2.477 Rapping Device or pans for the purpose 2.478 Rated Capacity -

A pendant of cleaning

operating in the path of the conveying by repeated blows after discharge. capacity value. _ or objects

such as buckets

An established

2.479 Receiving P/ate - A flat surface for receiving load to a conveyor. ( See a/so 2.389. ) 2.480 Reciprocating 2.481 Reciprocating 2.482 Recirculating Hoist Tray Load See 2.163.147. See 2.163.147. See 2.142.

bulk material


to advancing


machine used in connection with a blending system equipped with 2.483 Reclaimer - A travelling The reclaimer advances against the end of an oscillating harrow and a reversible flight conveyor. the pile and the oscillating harrow disturbs the material, causing it to flow downward to the flight conveyor which conveys the material to the reclaiming conveyor. 2.484 Reducer 2.485 Regulating opening through 2.486 Reinforced See 2.575. Plate - A plate which is adjustable which material passes. Cover See 2.594. for stacking reject sheets in a rolling mill. of a silo, used for bunker, cutting or bin and on a A conveyor or movable to permit varying the size of the

2,487 Reject Tab/e -

2.488 Reserve Storage - That storage which is maintained for future use.

of bulk material

in the lower


of conveyor 2.489 Resquaring Unit - A combination slitting strip or sheets in a metal processing operation. 2.490 Retarder conveyor. 2.491 Return Any device used to slow the rate

and mechanisms of travel

of bulk material

or objects

Track -

The strips

or track supporting to chain 81

the conveying and supporting


on the return


2.492 Rider Plate -

A flat plate attached

it from the track.

�IS: 4240.1984
2.493 Roll - A part generally The face may be corrugated, contoured. 2493.1 Carrying being conveyed. 2.493.2 Hydrostatic 2493.3 idler. Idler roll roll of circular cross section designed to revolve about a fixed axis. ribbed or fluted and straight, tapered, concave or otherwise conveyor, the roll upon which the load is supported while

In a live roller

roll -

A roll containing


(see ). conveyor acts not driven. to centre Also the rolls of a belt any load

Any carrying

roll of a live roller

2.493.4 Planar action roll - A double tapered when used as a component of live-roll conveyor. 2.493.5 Snub 2.494 Roller roll See 2.466.2 and 2.46616.

roll which


a) A round part free to revolve about its centre and roll on its outer be straight, tapered, crowned, concave or flanged. b) A component part of a roller chain in which occurring as the chain negotiates sprockets. for the chain and the load being conveyed.


The face may

it may serve only to reduce frictional loss Rollers may also serve as the rolling support as to backup the conveyor the conveyor belt idler. chain or other propelling medium. chain to being

so mounted 2.494.1Backup rollers - A series of rollers hold it in proper relation to the caterpillar chain dogs. 2.494.2 Carrying roller transported is supported. 2.494.3 Concentrator 2.494.4 Driven 2.494.5 Outboard 2.494.6 Pressure lubrication, usually roller roller roller The conveyor roller upon which

belt or the object

The inclined roller cantilever

roll of a troughing driven by belting,

Any carrying A roller

supported. integral bearings provided in both ends of the shaft. the driving belt with a means with the for load

lubricated rollers by drilling axial

with - Rollers and cross-holes

2.494.7 Pressure roller - A roller used for holding carrying rollers in a belt driven live roller conveyor. 2494.8 Return roller See 2.338.15.

in contact

2.494.9 Squirrel cage return roller - A return roller for a conveyor belt which incorporates a series of spaced rods, rather than a cylindrical tube, as the rotating element. Normally used to prevent material build up on the roller, or to permit the use of a cleated belt. 2.494.19Tapered roller - A conical conveyor roller for use in a curve with diameters proportional to their distance from the centre of the curve. 2.494.11 Weighted 2,495 Roller 2.496 Roller Bed Conveyor roller A series Curve A roller of rollers containing balls, shot, mercury of roller end and intermediate

or other weights. medium. conveyor. to

used to support or circular

the conveying section

A arcuate

for transferring a load from a roller conveyor 2.497 Roller Conveyor Turntable - Equipment another running at an angle to it by means of a roller-topped turntable (see Fig. 139 ).



2.496 Roller Rack A storage rack having tiered load-supporting surface of rolls. .


of roller conveyor arranged helically 2.499 Roller Spiral - An assembly of curved sections ever which objects are lowered by gravity (see Fig. 140). It is normally used for storage.


FIG. 140


2.500 Roller 2.501 Roller

Table Track -

See and See 2.495. of vertical rolls mounted in a frame to guide divided a conveyor by the roller chain bore

2.592 Roller Turn - A series around a horizontal curve.

2.503 Roller Working Bearing Pressure - The working load of the chain times the length of roller bearing surface in engagement. 2.504 Rolling Roll Inspection Table See around its axis

2.595 Roll Over inspection. 2.506 Roll-Way one direction.

A device used to rotate an object A roller conveyor having

of travel the rolls


repositioning except

or in

Skid -

brakes to prevent

from turning

2.507 Rotary Discharge amount, from a pneumatic

A device which permits discharge of material, usually conveyor tube system without interrupting air flow. cylindrical objects on the side, in steel drum manufacture. by a conveyor. which carries usually

in a controlled of

2.508 Rotator - A device for revolving Used commonly painting or cleaning. 2.509 Run The distance

for the purpose

or route covered That portion

2.509.1 Carrying run and discharge points.

of the conveyor

the load between and return from

the loading are adjato

2.509.2 Combined run - A portion of conveyor in which cent in a casing having a common partition plate. 2.509.3 Return run - That portion the loading end of a conveyor. of the conveying

the carrying



that returns

the discharge

2.510 Run-Around - A conveyor in the form of a circuit as distinguished from a shape in which the ( See also 2.147. ) carrying and return runs travel substantially the same path. 2.511 Run-in-Table See 2.24%. carrying mill. support. a ladder to prevent a climber from falling backwards. material from the discharge end of a processing

2.512 Run-out Table - Any conveyor machine, such as metal from a rolling 2.513 Saddle A screw conveyor

trough about

2.514 Safety Cage 2.515 Safety Dog -

A guard built See 2.329.

factor by which ultimate strength is divided to arrive at a safe 2.516 Safety factor - A numerical allowable or working stress in a machine or structural part. The value of the safety factor is increased where shock loads and other adverse operating conditions are encountered, 2.517 Safety Ladder A ladder with a safety cage. 83


- t984

2.518 Sag - The maximum distance between the path a conveyor belt actually takes due to the imposed load of material and its own weight, and the plane tangent to the top of the supporting idler rolls. This sag is limited by proper corielation of idler spacing and belt tensioning. 2.518.1 Belt sag See 2.518. A constant used to determine the idlers to a prescribed limit. selecting a portion the amount of tension required to

2.518.1.1 Belt sag factor limit the sag of the belt between 2.519 Sampler -

A device for periodically

of the material

being handled.

2.519.1 Automatic sampler - A mechanical device consisting of a sample cutter, the mechanical The automeans for operating the cutter and the means for isolation and recovery of the sample. matic sampler moves the sample cutter completely through the falling stream of material at a preset uniform speed and at preset time intervals. 2.519.2 Primary sampler One that samples the material through transported a stream on a conveyor. liquid and solids.

2.519.3 Wet sampler 2.520 Sanitary 2.521 Scalping bulk material. Hook -

A sampler

that operates

of combined

See 2.298. of removing oversize lumps on a continuous the moving basis from a stream of

The process

2.522 Scraper - A blade or blades caused to bear against of removing material sticking to the conveyor belt.


belt for the purpose

2.522.1 Pulley Scraper - A flat blade, the edge of which bears against used to scrape off any foreign material which may cling to the pulley face. 2.523 Screen parts. A perforated, slotted or meshed plane surface to remove

the face of the pulley, coarser from finer

used to separate matter from

2.524 Screen Box pneumatic conveyor. 2.525 Screw -

A screened



the air stream of a

See 2.525.1. of an

medium of a screw conveyor consisting 2.525.1 Conveyor screw - The material propelling ( see 2.525.1.1 to 2.525.1.12 ). assembly of helical flights mounted on a pipe or shaft. 2.525.1.1 Cast continuous flight conveyor screw flight and pipe or shaft cast integrally. 2.525.1.2 Cast sectional flight conveyor screw flight cast integrally 2.525.1.3 Cut-flight notched from each pitch screw A conveyor screw having

the conveyor of

screw conveyor screw - A conveyor with a hub and mounted on a shaft. A type of conveyor screw with


short sections

conveyor screw ( see Fig. 141 )#

a section

or sections

FIG. 141




2.525.1.4 Cut-and-folded flight conveyor screw - A type Of conveyor sections of each pitch cut and folded back ( see Fig. 142 ).



a section


FIG. 142





2.525.1.5 Double flight conveyor screw - A type of conveyor screw having two conveyor The axial distance between adjacent flights mounted 180" apart on the pipe or shaft. is equal to one-half the pitch of the conveyor screw flight. 84

screw flights

2.525.1.6 Helicoid screw flight conveyor screw A conveyor screw with a helicoid the pitch flight.

- 1984

2.525.1.7 Long pitch conveyor flight is more than normal.

screw - A conveyor ( See a/so 2.445.)


in which

of the conveyor

2.525.1.8 Multiple flight conveyor screw - A conveyor screw having two or more conveyor screw flights mounted at equal intervals around the pipe or shaft. The axial distance between adjacent flights is equal to the pitch of the conveyor screw flight divided by the number of flights. tioned flight flight screw 2.525.1.9 Paddle conveyor screw to form the material propelling 2.525.1.10 Ribbon flight conveyor is of the ribbon flight type. A conveyor means. screw screw in which screw paddles are pitched and posiscrew screw

A conveyor -A conveyor

in which having

the conveyor the conveyor

2.525.1 .I 1 Sectional flight conveyor screw made up of a series of sectional flights.

screw in which

2.525.1.12 Shorf pitch conveyor screw - A conveyor flight is less than normal. ( See a/so 2.445. ) Lining - A curved U-shaped plate in a steel trough.


the pitch

of the conveyor in a square

2.526 Screw Conveyor Trough wood trough or as a wearing

plate used to form a bottom

consisting of one or two inlined parallel conveyor 2.527 Screw Washer - A type of conveyor screws in a trough having a receiving tank and an overflow weir at the lower end and a discharge opening at the upper end. ( See also 2.163.119. ) 2.528 Scroll See 2.525.1. A device containing a packing material around a shaft. is shut

2.529 Seal Gland 2.530 Self-Cleaning off, it will deliver

if, by operating for a time after the feed - A conveyor is self-cleaning substantially all material contained in it to the discharge point.

with a continuous conveyor handling 2.531 Self-Unloading Boat, Ship or Barge - A ship equipped system forming a self-contained unit which can unload a cargo of bulk materials without the aid of shore or dock facilities. 2.532 Sending Box See 2.617. material from the air stream of a pneumatic conveyor

2.533 Separator - A unit used to separate by use of centrifugal action or by filters.

of interlocking controls for a series of conveyors by 2.534 Sequence Sfarting - An arrangement means of which the conveyor at the final discharge end of the system is started first to be followed The order of stopping the in sequence until the last conveyor at the loading end is set in motion. The conveyor under the units of such a series is directly opposite to the sequence for starting. loading end is stopped first and the conveyor at the final discharge end is stopped last. This arrangement prevents any pile up of material in the transfer chutes between the various units of the system. 2.535 Service for increased Factor - The amount service requirements. by which the normal rating of a unit is reduced to compensate

2.536 Shakeout a) A device for separating

sand and casting




in a foundry.

b) The process by which agglomerated material is agitated so that particles are shaken apart. Especially applied to foundry conveyors where sand is to be separated from cast metal. with a free driven component such 2.537 Shear Pin Device - A safety device assembly designed as a wheel, sheave or sprocket connected by a pin to a driving component, such as a hub. Pin must be of a diameter necessary to drive the cenveyor within safety limits and must shear when the safety limit is exceeded. When the pin shears, the driving component disconnects from the driven component. 2.538 Shear Pin Hub See 2.537. with shock absorbing features, for supporting and feeding metal to

2.539 Shear Table - A conveyor plates and shapes to a shear. 2.540 Sheet Classifier facilitate the inspection,

A combination of conveyors and associated sorting and piling of sheet metal into the different 85

mechanisms categories.


�IS :4240 - 1984
2.541 Sheet Drying 2.543 Sheet Metal Table Spiral See 2.163.123. See 2.140.17. mechanism with conveying sheets equipment so that they for the may be

2.542 Sheet Floater -

See 2.545.

2.544 Sheet Piler - The combination of associated piling of metal sheets and for removal of stacks.

2.545 Sheet Separator - A mechanism which parts the ends of piled picked up, singly or in groups, either manually or mechanically. 2.546 Shift Register Memory advance the dispatch signal 2,547 Shoe - An providing support. attachment - An electro-mechanical in steps. or component terminal for system purposes of

in which absorbing

unitgloads thrust

on a conveyor or wear or for which

2.547.1 Foot shoes the conveyor rests.

The formed

at foot end of a/portable parts placed at rubbing

conveyor points



2.547.2 Wearing shoe - Conveniently protect main members from damage. 2.548 Side Bar end of the link. That portion A device of a chain to position


to take the wear an& portions at each.

link that longitudinally an object on its

connects end round

the joint

2.549 Side Ender direction of travel.

by rotation

at a right

angle to its sideways by

2.550 Side Tilter - A device which causes an object, tilting a portion of the conveyor bed or trough.


to be discharged

usually round, for storage of material. 2.551 Silo - A structure, 2.551.1 Band silo - A British term for a self-discharging storage bin or tank in which a flat belt or series of belt conveyors constitute a moving bottom. 2.552 Skew Tab/e - A live roller conveyor having its rolls skewed for the purpose of moving objects laterally against a guide member. It may have a fixed or adjustable guide member. ( See also ) 2.553 Ski Hoist - A type of conveyor adapted for carrying or assisting skiers to,.the top of a slope. It is also used for carrying or assisting workmen up or down a slope. 2.554 Ski Tow - See 2.553 2.555 Skid a) A support mounting for a portable conveyor consisting of skids or runners. b) A runway consisting of two or more runners for moving cylindrical objects by hand or by gravity. 2.556 Skim Coat - A thin layer or coat of special rubber compound placed between the plies of the carcass of the conveyor belt to improve flex life and impact resistance. 2.557 Skip Bucket Bail - See 2.30. Multi-wheeled bucket or car operating up and down a defined 2.558 Skip Hoist InclinedlVerticalpath, through wire rope receiving, elevating, and discharging bulk material on an inclined/vertical track curved at the top to tip and empty the skip automatically ( see Fig. 143 ). ( See also 2.558.1. )


a) Inclined

Skip Hoist FIG. 143 SKIP HOIST

b) Vertical

Skip Hoist


2.558.1Stockpilling running on a stockpile 2.559 Skip hoist skip hoist - Trunnion-mounted and hauled by a wire rope. machine The hoisting self-tipping skip on a multiwheeled trolley



of a skip hoist.

2.560 Skirt Board -

See 2.561.

plates located longitudinally above the carrying medium 2.561 Skirt Plate -. Vertical or inclined Usually used at point of entry of material onto a to confine the material and prevent spillage. conveyor where turbulence is encountered and when depth of material load is such that spillage would occur if not confined. 2.562 Slat - A member conveying bed.



in a slat conveyor.

The series

of slats form the

packages 2.563 Slide - A sloped surface to permit free flow of bulk materials, Similar to a straight particular confinement or restraint at point of discharge. restraining sides or top. ( See also 2.140. ) 2.564 Slider Bed 2.565 Sliding Base A stationary A support surface providing on which the carrying movement.

or objects without chute but without slides.

run of a belt conveyor


2.566 Slip - The action of a belt which takes place when the pull exceeds the friction pulley, imposing a speed differential between the pulley surface and the belt. 2.567 Slope See 2.297. See 2.163.46. which supports a snub wheel or pulley. the direction of travel of a rope,


on the

2.568 Sludge Collector 2.569 Snub Shaft 2.570 Snub Sheave chain conveyor, etc. 2.571 Solenoid -

A shaft

Any sheave used to change control.


or coil

An electromagnetic

2.572 Sorting Table - Any horizontal conveyor packages or objects from the conveyor.

where operators,


its side,


bulk material,

2.573 Speed - The length of belt, chain, cable, or other linkage which passes a fixed point within a given time. It is usually expressed in length per unit time. In the case of the rolling chain conveyor, the load is moved at a rate double the chain speed. ln screw conveyors, the speed is expressed in terms of `revolutions per minute' and the speed at which the material is conveyed is dependent upon speed, pitch of the screw, type of flight, angle of inclination, nature of material, etc. 2.573.1 Belt speed 2.573.2 Conveyor 2 573.3 Cutter material. See 2.573. See 2.573. a sample cutter passes through speed. for the speed, for

speed -

speed -

The speed at which An instrument

the main



2.574 Speed Indicator

for visually


2.575 Speed Reducer - A power transmission driven equipment less than that of the prime Most generally totally enclosed for lubrication

mechanism designed to provide a speed mover. Can be either constant or variable and prevention of entry of foreign materials,

2.576 Spinner Unit -A power-driven belt or chain operating in a horizontal revolving rotatable fixtures attached to a spindle conveyor or a trolley conveyor spraying or drying. 2.577 Spiral Enclosure 2.578 Spiral Runway 2.579 Spiral Shell 2.580 Spiral Slide See 2.579. A roller spiral, spiral chute or wheel spiral. spiral chute.

plane used for purposes

The outer enclosure See 2.140.17.

of an enclosed

2.581 Spiral Tread Plate of a spiral chute. 2.582 Spiral Trough 2.583 Spout A closed

One of the formed


used in making

up the tread

( trough

or bed )

The conveying chute

area of a spiral

chute bed or tread and guards. ( See a/so 2.583.3. )

for bulk materials

or objects. 87

�JS : 4240 - 1984
2.583.1Dock spouf - A spout used for loading marine vessels. of discharge by means of

2.583.2 Swivel spoof - A spout or chute arranged of material can be varied. 2.583.3 Telescoping spout telescoping the body members. A type of spout

to turn or rotate so that direction of which may be varied

the length

2.583.4 Turnhead spout - A vertically pivoted spout points on an arc of which the pivot is the centre. 2.583.5 Twist spouf 180" arc. 2.584 Spray Cleaner 2,585 Sprocket A roller-conveyor An arrangement trough

used to discharge through

bulk materials

to various a

that twists

a 90" arc and occasionally of cleaning hydraulically.

of spray nozzles

for the purpose

See 2.887.9. A sprocket having two teeth for each chain drive or of a corner by the chain. pitch. drive.

2.585.1 Double duty sprocket 2.585.2 Drive sprocket 2.585.3 Driven sprocket 2.585.4 Head sprocket 2.585.5 Idler sprocket 2.585.8 Snub sprocket 2.585.7 Tail sprocket 2.585.8 -

,- Either sprocket A sprocket That sprocket See 2.338. See 2.887.8. A sprocket -

of a chain



is propelled


on the head shaft.


on the tail shaft. on the takeup shaft. sprockets chain

Takeup sprocket

A sprocket


2.586 Sprocket Ratio - The ratio between the number of teeth of driven and driving respectively and indicating the change of speed existing through a chain drive. 2.587 Sprocket Turn - A horizontally around a horizontal curve. 2,588 Spur See 2.329 and 2.471. spur. conveyor to switch on in which the trucks are switched placed idler sprocket used to direct

a conveyor

2.588.1 Non-powered

a) A turnout for an in-the-floor a non-powered line; and b) A gravity conveyor section

from a main line to

unit loads to and from the main line. plates or sheets are squared prior to cutting or

2.589 Squaring Table - A conveyor slitting. (See a/so 2.552. ) 2.590 Stacker


a) A conveyor adapted to piling or stacking bulk materials, 2.163.11, 2.163.48, 2.163.99and 2.173.7 ). b) A fixed or pivotally mounted boom conveyor.


or objects

(see 2.163.2,

C) With a blending system the stacker operates over the stocking conveyor in a manner similar to a wing tripper to build layered piles or beds of material parallel to the stocking conveyor. (See also 2.163.13 and 2.651.2.10. ) 2.590.1Air stacker - A sheet piler which provides a cushion of air under being stacked to control contact between the sheets (see Fig. 144 ). each sheet as it is


2.590.2 Empty pallet stacker them for re-use or shipment. 2.591 Stand and 2.456. ) 2.592 Starting is applied. The Effort centre The A device end for receiving of to put rolls empty of pallets and automatically idler. (See stacking a/so when 2.351 power are

and force


a troughing medium


a conveying

in motion

2.593 Station - The location on a conveyor or conveyor system where bulk material or objects received or loaded onto conveyor or are discharged from conveyor. (See a/so 2.617. ) 2.593.1 Discharge conveyor. station A location at which bulk materials or objects are removed

from a roller are the

2.593.2 Dwell station - An unpowered portion in an intermediate conveyor or belt conveyor upon which objects may be held for processing 2.593.3 Intermediate included intermediate conveyor. station between The additional receiving or the first receiving position discharge and the

length of a live or other purposes. station(s) discharge which end of

location or device on a conveyor or conveyor 2.593.4 Receiving station -The bulk material or objects are loaded or otherwise received onto the conveyor. 2.594 Sfep Pad - A construction thickness down the centre. This centre area.


where greater in the of

of rubber conveyor belt having a defined area of is accomplished by moulding the rubber cover thicker

discharge or in a chute to permit 2.595 Stone Box - A rigid shelf at a conveyor material which absorbs impact and eliminates abrasion of material on metal. 2.596 Storage 2.597 Bin See 2.69. Table See 2.552.



increase in length which takes place when tension is imposed. This 2.596 Stretch -The Elastic stretch is the temporary change in elongation is of two types, elastic and permanent. Permanent stretch is the residual change in length after length which varies directly with the pull. tensioning has been removed, which generally accumulates slowly over a period of time. 2.599 Stringers supports. The longitudinal supporting members between the head and foot terminal

2.600 Stub Shaft - A pin or short shaft cantilevered wheel or other rotating member. 2.601 Superstructure the load to the building 2.602 Sweep 2.603 Switch a) Any device for connecting b) An electrical control Members members. to which the

from its mounting steel

for supporting and

a bearing, transfer


is connected


See 2.201.

two or more contiguous

package conveyor



c) In a power-and-free conveyor, that mechanism which accomplishes the transfer of a free line trolley from one track to another track at converging or diverging sections of track. (Commonly called `entrance and exit switches'). 2.603.1 Belt Penetration switch - A cqmbination beneath the carrying surface of a belt conveyor penetrates the belt. located of cams, levers and a limit switch designed to be actuated by any object which by the edge in a transfer

2.603.2 Be/f fracking switch - A limit switch with a suitable actuator operated of a conveyor belt when the belt moves abnormally to either side of its centred path. 2.603.3 Chufe plugging safety swifch - A level, chute to detect an abnormal build up of material. indicating device usually carrier located

the load 2.603.4 Entrance swifch - The switch which transfers main conveyor line in power-and-free and in-floor tow conveyor. 2.603.5 Exit switch - The switch which a spur or subsidiary line in power-and-frea

from a spur line to the line to

transfers the load carrier from the main conveyor and in-floor tow conveyors. 89

�IS : 4240- 1984
2.6036 Fire door switch an intermediate discharge - A hinged hatchway type door for spiral plate when closed to a horizontal position. chutes which also serves as and of allied

2.603.7 Limit switch - An electrical device by \?rhich the movement of a conveyor equipment may be controlled within predetermined limits. (See a/so 2.375. ) 2.603.6 Proximity swifch - A special object moving near its operating head. limit switch actuated by the magnetic effect

a ferrous

2.603.9 Pull cord switch - A switch (or switches in a long conveyor) mounted along the conveyor stringer and manually actuated by a cord running the full length of the conveyor. The switch (or switches) may be actuated from any point along the conveyor length as an emergency stop. 2.603.10 Slack cable switch supply when the hoisting cable 2.603.11 Starvation alarm or otherwise minimum. swifch react A device installed on skip hoists to automatically shut becomes loose or has slack due to accident or jamming. limit switch or other sensing material flow on a conveyor track switch which off power

-A when

device arranged to sound an falls below a predetermined line of a power-andfrom one

2.603.12 Tongue switch free trolley conveyor. 2.603.13 Wheel conveyor conveyor line to another. 2.604 Tail End 2.605 Tail Section Usually -

A pivoted switch -

is used on " free " mechanism

A wheel


conveyor point.

for switching

the end nearest

to the loading

( See a/so 2,246. ) end of a conveyor. sprockets, sheaves or other

The frame or structure

at the tail or loading

2.606 Tail Shaft - The shaft supporting the tail end pulley, components at the tail end of a conveyor. ( See a/so 2.246. ) 2.607 Tail Sheave A sheave mounted on the tail shaft.

piece immediately adjacent to the moving surface of a moving walk, 2.608 Take-Off Lip -That with a close clearance with respect to the carrying surface, where passengers make the transition between moving and stationary surfaces. and mechanical parts which provide the 2.609 Takeup - The assembly of the necessary structural means to adjust the length of belts, cables, chains, etc, to compensate for stretch or shrink and to maintain the proper tension. ( See also 2.609.1to 2.609.6. ) provisions 2.609.1 Automatic takeup - A take up having compensate for stretch, shrink or wear of belts, cables, chains, tension. 2.6092 Counterweighted matically by the potential fakeup - A take up mechanism energy in weights. which permit etc, and to the it to automatically maintain the proper is made autoby



2.609.3 Gravity takeop - A take up mechanism where adjustment is performed automatically the potential energy of the weight of the takeup mechanism and/or auxiliary weights. 2.609.4 Loop fakeup 2.609.5 Screw a) A takeup takeup A horizontal automatic takeup system where belt is looped.

See Fig. 145. movement of the bearing block is accomplished by means of a screw. more screws medium.

in which

b) A takeup assembly having provision for manual adjustment by one or to compensate for stretch, shrink or wear of conveying or power transmission