US005339938A

United States Patent [191

[11] Patent Number: [45] Date of Patent:

Patin [54] VARIABLE-SPEED CONVEYOR ELEMENT,

FOREIGN PATENT DOCUMENTS

PARTICULARLY FOR ACCELERATED TRANSPORTERS

[76] Inventor: .

5,339,938 Aug. 23, 1994

0007264

l/l980 European Pat. Off. .

2077171 10/1971

Pierre Patin, 15, rue Bu?‘on, 75005 Paris, France

France .

2207069

6/ 1974 France .

2274523

l/1976

France .

[21] Appl. N0.: 79,280

Primary Examiner-Joseph E. Valenza

[22] Filed:

Attorney, Agent, or Firm—-Pollock, Vande Sande &

[30]

Jun. 21, 1993

Priddy

Foreign Application Priority Data

Jun. 24, 1992 [FR]

France .............................. .. 92 07709

[51]

Int. Cl.5 ......................................... .. B65G 23/00

[52]

US. Cl. .................................. .. 198/334; 198/792;

[58]

Field of Search ............. .. 198/334, 337, 792, 850,

198/ 850

198/ 851, 853

[56]

References Cited U.S. PATENT DOCUMENTS 2,584,134 3,884,152

2/ 1952 5/1975

4,053,044

10/1977

4,267,922

5/ 1981

Knutson ............................ .. 198/851 Emeriat ................... .. 198/334 Patin

. . . . .. . . . . . . . . .

. . . ..

[57]

ABSTRACT

The variable-speed conveyor element applied to a hand

rail is made up of individual handles linked together by elements of variable length which themselves function like elements of the handrail. Each of these variable length elements is formed from a continuous ?exible link, such as a belt or cable, to which are ?tted contigu ous blocks which stop or limit the bending of the ele ments in one direction. The blocks have projections and recesses allowing them to mutually interlock and ensure

the transmission of forces.

198/334

Patin et a1. ........................ .. 198/334

5 Claims, 3 Drawing Sheets

U.S. Patent

Aug. 23, 1994

.

I .‘

Sheet 1 of 3

BU )

U-S. Patent

Aug. 23, 1994

Sheet 2 of 3

a:

US. Patent

Aug. 23, 1994

Sheet 3 of 3

5,339,938

1

5,339,938

2

stretched between the two pulleys are in contact over

VARIABLE-SPEED CONVEYOR ELEMENT,

their entire height with the corresponding frontal faces

PARTICULARLY FOR ACCELERATED TRANSPORTERS

of the adjacent blocks, and are able to separate in angu lar fashion between the two convex sections of the link

turning around the pulleys. The two frontal faces, re spectively front and rear of each block, have angular pro?les deduced one from the other by translation par allel to the direction of the link. Each front face of a

BACKGROUND OF THE INVENTION 1. Field of the Invention In certain cases of mechanical conveyors, particu larly accelerated transporters, elements are required, particularly for the handrails, that bend in one direction

block comprises at least one projection and each rear face at least one recess complementary to the projec only, at least in certain zones. tion, such that in the rectilinear section of the link be 2. Prior Art tween the two pulleys, each projection on a front face The prior art consisted in using chains ?tted with of a block ?ts into a complementary recess in the facing locks which oppose the bending. The current state of rear face of the adjacent block so as to form a mortise the art is represented by French patent Nos. 2 274 523 15 and tenon joint that is able to resist the shearing forces and 2 431 07 5. applied on the link, the projections separating from the The handrail which is the object of these patents is recesses in the convex sections of the link. intended for an accelerated transporter made up of The ?exible link is preferably constituted by a

handles linked together in twos by a ?exible link. Each notched belt. handle must be synchronous with the corresponding 20 BRIEF DESCRIPTION OF THE DRAWINGS point of the moving floor, and consequently, the han

The construction and operation of such a handrail is illustrated in FIGS. 1 to 4. FIG. 1 shows a longitudinal cross-section of such a handrail that in one zone may be only downwardly folded with a small radius, but in another zone may also

dles must separate from each other in acceleration zones, come closer together in deceleration zones and remain equidistant in constant speed zones. This result is obtained by mounting each handle on a small carriage. Two successive carriages are connected by a ?exible link which can bend in only one direction and which

be upwardly folded through a much larger radius.

provides a hand rest area between two handles. The

FIG. 2 shows an alternative embodiment. FIGS. 3 and 4 show the use of such a handrail in an

?exible link element is folded, at right angles to the handle, around a pulley and is secured to a tightening

accelerated travelator.

carriage or runner whose track can come closer to or

DESCRIPTION OF THE PREFERRED EMBODIMENTS

move away from that of the carriage to which the han

dle is ?tted, thus making it possible to ensure the change in speed. According to these patents, the ?exible element is

FIG. 1 shows a handrail element in which: 35

made up of a chain furnished with blocks whose com

zone 4 can curve downwardly in a certain zone with a radius in the order of a few centimeters.

zone 5 is rigid and integral with a small carriage sup ported by an axle 9,

plex shape is designed so that the link element, working as a simply supported beam, i.e., subject to a bending moment and a shearing force, does not deform when brought under load; the ?exible element between two

zone 6 can curve upwardly with a radius in the order of a meter.

The handrail is made up of a notched belt 10 to which are ?xed blocks 11 whose shape allows

handrail handles may itselfbe used as a handrail in the

event of “jostling,” for example. The main drawback of this system is its complexity, which generates a rela

reciprocal interlocking between two contiguous

tively high cost. In the device according to the invention, the ?exible 45

blocks thanks to a projection 12 which ?ts into a recess 13. The block is ?xed to the back of the belt

either by bonding 14, as for blocks 11a, 1117, or by

element is made up of a continuous ?exible link of con stant cross-section, such as a belt, cable, or set of belts or

bolting 16 on an insert 15, as for the blocks 11c,

11d. This ?xing is always performed at right angles

cables, which have the characteristic, unlike chains, of offering resistance to the shearing forces, and which are associated with compression blocks of simple form

rigidity of the belt, the belt mainly bending in the

which ?t into each other. The application of such a

gap between notches. The thickness of a block at

device to a handrail will now be described below by

any point measured parallel to the back of the belt is constant and equal to the pitch of the teeth. Such a system operates in the following way. All loading of the handrail, which works like a simply sup ported beam, introduces a bending moment and a shear

to a notch which is the position of maximum .

way of example. Similar devices could, however, be used in other conveyor elements for people or goods. SUMMARY OF THE INVENTION This invention relates to a handrail element, linking two handles, made up of a ?exible link stretched be tween two attachment points and which passes around

55

ing force. The longitudinal compression due to the

moment is taken up by the heads of the blocks, and the tension by the handrail. The shearing force is transmit two guide pulleys spaced apart from each other and 60 ted from one block to another by the projection-recess which together with the two attachment points form a couple and the resultant shearing at the block-belt inter quadrilateral that deforms according to the speed of face is taken up by bonding 14 and bolting 16. conveyance. The link is equipped with a series of adja In rigid zone 5, the inner face of the belt is ?xed to cent blocks each comprising a lower face for ?xing the carriage 8 also by gluing or bolting. block onto the link, an upper face on which hands can 65 To allow the handrail to bend upwardly, the thick rest and two frontal faces, respectively front and rear, ness of blocks 11 in zone 6 decreases slightly, and regu perpendicular to the direction of the link. The frontal larly, from the bottom towards the top, the blocks being faces of a block in a rectilinear section of the link

?xed in the same way as those in the other zones. FIG.

3

5,339,938

responding frontal faces of adjacent blocks;

has been provided with a certain operating symmetry which can o?‘er certain advantages. Each block 17 com prises on each face perpendicular to the axis of the notched belt 10, ?rst, a projection 18 and a recess 19, VI and secondly, a recess 20 and a projection 21 facing projection 18 and recess 19. The device fimctions in a

similar way to the preceding device. Different shapes could be use within the scope of the invention. FIGS. 3 and 4 show the use of such a handrail in an

4 being in contact over their entire height with cor

2 shows a different arrangement in which the system

10

(d) said blocks in convex sections of said link turning '

on the pulleys being adapted to separate in angular

fashion; (e) said two frontal faces, respectively front and rear, of each block having angular pro?les deduced one from the other by translation parallel to said direc tion of said link, each front face of a block compris ing at least one projection, and each rear face com

prising at least one recess having a pro?le comple mentary to a pro?le of said projection, such that in the rectilinear section of said link between said two

accelerated transporter. Two handrail handles 24a, 24b are connected together by a handrail element 23 passing over guide pinions 7a, 7b and anchored to speed-varia tion trolleys 25a, 25b. Handles 24a, 24b have rollers

pulleys, each projection on a front face of a block ?ts into a complementary recess in a facing rear

carried by spindles 26a, 26b of pinions 7a, 7b. Axles 9a, 9b of carriages 8a, 8b have similar rollers which, like all

and tenon joint that is able to resist shearing forces

the other rollers, move between two rails 27 and 28.

applied on said link, said projections separating

face of an adjacent block so as to form a mortise

from said recesses in convex sections of said link.

Speed variation trolleys 25a, 25b to which the ends of the belts are anchored are maintained by a rail‘30 at a 20

projection has upper and lower bearing faces which

variable distance D from rails 27 and 28, which makes it possible to vary the spacing of the handles and conse- _

quently their speed, the rate in number of handles per second being constant. Fig, 3 shows an overall view of an element in an accelerated transporter zone with a horizontal handrail in a speed acceleration zone. FIG. 4 shows this same assembly in a zone where the handrail passes from a horizontal section to a sloping section. The curve is taken in zone 6, whose radius of curvature r is of course much shorter than the connect

2. The conveyor element of claim 1, wherein each converge towards an outside of the block, each recess

having lower and upper bearing faces diverging toward the outside, so as to allow a said projection to progres

25 sively engage in a said recess during a transition from a

convex section to a rectilinear section of said link, and

inversely. 3. The conveyor element of claim 1, wherein said two front faces of each block each have a projection and a recess.

4. The conveyor element of claim 1, wherein said ?exible link is a notched belt having an inner face com

ing radius of curvature R, low speed zones 4 and 5

prising projections separated by recesses, said blocks

remaining rectilinear.

being ?xed onto an outer face of said notched belt in 35 such a way that a joining plane between bases of two What is claimed: adjacent blocks corresponds to a recess section of said 1. A variable-length conveyor element applicable to a ?exible link. handrail for a device for transporting people at variable

5. The conveyor element of claim 1, wherein, by deformation of said quadrilateral according to a speed of conveyance, said two guide pulleys become sepa

speed, said conveyor element comprising: (a) a ?exible link stretched between two attachment

points and passing around two guide pulleys spaced apart from each other which, together with

rated on either side of two supporting rollers spaced at -

a constant distance, the rectilinear section of said link comprising a central zone of ?xed length between two supporting rollers, and two lateral zones of variable

the two attachment points, form a quadrilateral

that deforms as a function of a speed of convey ance; 45 length each extending between a supporting roller and

(b) said link being equipped with a series of adjacent blocks, each comprising a lower face for ?xing the

the corresponding guide pulley, a length of an upper face of each block in the central ?xed length zone being slightly less than a length of the lower face by which the

block onto said link, an upper face on which hands

can rest, and two frontal faces, respectively front block is ?xed to the link, such that the handrail has a and rear, perpendicular to a direction of said link; 50 slight upwardly concavity between the two supporting (0) said frontal faces of a block in a rectilinear section rollers. * t # Ii it of said link stretched between said two pulleys 55

65

Variable-speed conveyor element, particularly for accelerated ...

Jun 21, 1993 - stretched between the two pulleys are in contact over their entire height with the corresponding frontal faces of the adjacent blocks, and are ...

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