FR2525547A1 - BEARING DEVICE FOR A MANUALLY MOVING CARRIAGE CARRIER - Google Patents

Abstract

THE INVENTION RELATES TO A ROLLER DEVICE FOR MANUALLY MOVED CONVEYOR TROLLEYS. THE BEARING DEVICE INCLUDES A WHEEL 12 MOUNTED IN A FORK 10 AND PROVIDED WITH BOLTS 22 SPACES ONE OF THE OTHER SO AS TO BE ABLE TO ENGAGE IN THE INTERVALS BETWEEN RIBS 21 OF A CONVEYOR BELT 20; A BRAKE SHOE 27 IS PROVIDED ON THE DORSAL PART OF THE WHEEL FORK 10, AGAINST WHICH A BRAKE BODY 23 IN THE FORM OF A CIRCULAR RING APPLIES ON THE UPPER SIDE. APPLICATION TO SALES STORE TROLLEYS.

Description

BEARING DEVICE FOR A TRANSPORTER CARRIER MOVING MANUALLY.

  The present invention relates to a rolling device for a hand-moved transport trolley, in particular a shopping trolley, comprising a wheel provided with straps placed at a distance from one another and arranged to penetrate into grooves of a conveyor belt, said wheel being provided with a braking body disposed between the strands, resting on the ribs of a conveyor belt, which has the shape of a circular ring of smaller diameter than the strands and which s' grips with its inner periphery with play on a cylindrical portion of the wheel disposed between the strands, and which is

  mounted on a shaft held in a fork.

  In a known rolling device of the type defined above, the wheel consists of two flanges rotatable independently of each other and which are provided with a flange, a wheel cylinder, connected without the possibility of relative rotation. to the axis supporting the flanges being disposed between said flanges The brake body shaped

  circular ring that surrounds this wheel cylinder has a di-

  inner meter which is much larger than the outer diameter of the

  wheel cylinder, so that the braking body is suspended

  in the normal position to the wheel cylinder and has, at its lower apex, a relatively large clearance between its periphery

  interior and the outer periphery of the wheel cylinder.

  In this respect, however, the braking body is dimensioned such that

  so that its outer periphery includes, in the case of a

  Rolling device resting on a flat ground, a small spacing from the plane of the ground, or slightly in contact with it When engaging the rolling device on a conveyor belt provided with longitudinal ribs, these ribs push the annular-shaped braking body upwards, while the houdlin penetrate the ribs of the conveyor bard, so that only one support of the Repeatedly by means of the braking body, which applies then to the pillar: - 5 - in the area of the lower coast, to the glove of the nose and to the throttle body. by friction effect, a rotation between the cylinder e: -e -t the braking body For this device this rauleeen, it And aalemat known to provide the outer periphery of the wheel ylindre and "an inner periphery of the braking body striations, grooves, teeth and similar parts, in order to increase the friction In each case, however, the braking torque is transmitted via small lever arms J to the wheel support fork, so that the braking torque can be transmitted by means of small lever arms J to the wheel support fork. that high forces are acting on your areas of

  transmission which must then be dimensioned in correspondence.

  The object of the invention is to provide a roller apparatus of the type defined above, in which the braking forces acting on the transmission zones are reduced and can be exerted.

  directly on the wheel support fork.

  This problem is solved according to the invention in that a brake shoe is fixed on the back of the wheel fork and in that the braking body in the form of a circular ring is applied from above against said shoe, being supported at the bottom by the ribs of a conveyor belt. Thus, a direct fixation is obtained on the wheel fork of the brake ring resting against the ribs of a conveyor belt, and a large lever arm associated with the support force on the wheel fork, so that the braking force resulting from the driving force is relatively low compared to the known solution; in addition, by adapting the dimensioning of the components to the balance of forces, it is possible

  to manufacture the rolling device economically.

  In this respect, it may be sufficient for the braking force to be

transmitted by friction effect.

  However, in order to be able to safely transmit large braking forces by creating a link with a combination of shapes, it is provided, according to another characteristic of the invention, that both the outer periphery of the brake body circular ring that the braking surface of the brake shoe is provided with a locking toothing In this respect, it may be advantageous, in order to obtain a support free of doanmmage of the brake ring on the ribs of the brake shoe. conveyor belt, that the toothing is provided only over part of the width of the annular braking body, in which case the outer diameter of the toothing may, if appropriate, also be slightly reduced in relation to the diameter of the outer periphery of the brake ring to safely exclude that

  the tooth heads come into contact with the ground.

  Instead of a connection of the brake elements by conjugation of shapes, it is also possible, in the case of a connection by

  friction, to increase the adhesion by partial surfaces.

  For this purpose, according to another characteristic of the invention, there is provided on the outer periphery of the circular-shaped braking body at least one groove having a trapezoidal cross-section widening towards the outside and the brake shoe comprises at least

  a circular segment fitting into this groove.

  In many cases, it may be sufficient for the wheel to have

  two strands rotating in synchronism with each other Such a structure

  It can be arranged in a simple manner by ensuring that the flanges advantageously constitute a part of the wheel cylinder which consists of two tires placed on a wheel rim and which are held assembled in an axial direction without the possibility of

relative rotation.

  However, it is also possible to let the rods rotate independently of each other when it seems desirable to allow a differential wmuvenent between them To solve this problem, it is

  provided in accordance with another advantageous feature of the invention.

  tion, that the wheel cylinder is constituted by two flanges mounted independently of one another on the axis, each flange wheel being

andmoved by his own pudding.

  To avoid wear, and also noise, caused by relative uouvnet between the brake ring and the cylindrical portion of the wheel, on the one hand, and by rolling the brake ring on the ground, on the other hand on the other hand, according to another characteristic 3 S of the invention, elastically flexible centering bodies are provided which

  are disposed between the braking body and the cylindrical wheel portion.

  By these centers of centering, it is obtained that the braking ring is mimtemu oetre relative to the axis of the rolling device in the case of normal operation c dnnier and does not come into contact with the surface of Ealement Brake lanyard support is pushed towards

  the top, during the penetration of the strands in the intervals

  both between the longitudinal ribs of a conveyor belt, in opposition to the action of the resilient centering members, so that it is applied Dar its outer periphery against a brake shoe fixed on the wheel fork in order to brake or immobilize the rolling device in this case Thanks to the use of centering members, it is possible to dispense with a cylindrical part of a wheel formed of the same material as the tubes because it is possible to use to form the

  centering devices of inexpensive materials.

  In order to be able to arrange the centering members in the form of simple components in a position concentric with the axis of the rolling device, it is provided, in accordance with another advantageous characteristic of the invention, for the resilient centering members to form components of a centering ring also arranged between the tubes and mounted on the cylindrical portion of the wheel, in which case the centering members resting on the inner periphery of the braking body maintain the latter in the normal position in a concentric arrangement and approximately near at a spacing distance

  uniform outer periphery of the centering ring.

  As centering members, the centering ring preferably includes

  several elastic tabs distributed at intervals

  uniform on its outer periphery and applying by their ex-

  free ends against the inner periphery of the braking body.

  In this regard, the resilient tongues are advantageously constituted by recesses formed in the centering ring and oriented in a peripheral direction, and each pair of elastic tongues applying by their free-bearing head against the inner periphery of the body of braking is arranged in the form of a pair of springs, in which case, advantageously, three pairs of springs are distributed

  uniform intervals on the periphery of the centering ring.

  Other objects and advantages of the present invention will become apparent

  on reading the following description and accompanying figures, given

  for illustrative but not limiting.

  FIG. 1 is a partially cut-away side view of the rolling device according to the invention, based on an inclined conveyor belt and comprising braking elements.

  which come into action by conjugation of forms.

  Figure 2 shows the rolling device of Figure 1,

  in vertical section passing through the wheel axle.

  FIG. 3 is a sectional view of another embodiment of a rolling device, the braking elements of which engage with each other by means of a combination of forces.

  intermediate of wedge-shaped surfaces.

  FIG. 4 represents another rolling device comprising braking elements that can be connected by conjugation of shapes and in which however the wheel cylinder is composed of flanges

  being rotatable independently of one another, this rolling device

  also being shown in section.

  FIG. 5 shows in side view and in longitudinal section the rolling device according to the invention, in which the ring of

  braking is placed in a centered loosening position.

  Figure 6 shows the rolling device of Figure 5,

  in section on line VI-VI of Figure 5.

  The rolling device essentially consists of a wheel support fork 10 which can be designed both for a fixed rolling device and for a rolling bearing device and a wheel 12 mounted on an axle 11 In the example of rolling device shown in the figures, the axis arranged in the form of a bolt is surrounded by a sleeve 14 held between the legs 13 of the fork 10; in this sleeve are fixed rings 15 of ball bearings 16 On these ball bearings are based, in the embodiment shown in Figures 2 and 3, two wheel flanges interconnected for example by riveting to form a wheel rim

  17, said flanges being unable to move in an axial direction.

  The rim receives on its outer periphery two tire portions 18 each having a bent-shaped section, said parts of the tire being arranged and fixed on the rim 17 so that the horizontal legs together constitute a wheel cylinder 19, while the vertical branches constitute on the outside of the flanges 22 which are placed at a spacing distance corresponding to a multiple of

  no spacing of the ribs 21 of the conveyor belt 20.

  Between these strands 22 is disposed a braking body 23 in the form of a circular ring, which surrounds the wheel cylinder 19 with a relatively large clearance. In the embodiment shown in FIGS. 1 and 2, the braking body is provided with on its outer periphery of a toothing 24 thorough on pa; i ;; s, _; Which is bordered by each of the two by two canceled? The outward-facing ring-shaped ring 23 is of annular shape corresponding to the reduction of the clearance existing between the outer edge of the cy U; The inner diameter of the body is thus smaller than the height of the ribs and can rise up to about half the height of the necks. , Da: vc dor Sr the 26 ensuring the connection of the branches 13 Ce has fork d eue, I st provided a brake shoe 27 which is provided, e 'pe er risation of Figures let 2, also a toothing 28 which covers aa: S opening

24 of the brake body 23.

  The rolling device shown in FIG. 3 essentially corresponds to the structure of the bearing, shown in FIGS. 1 and 2. However, a difference in the embodiment shown in FIG. braking body

  23 'in the form of a circular ring and the brake shoe 27'.

  In place of a locking toothing, the ring-shaped braking body 23 'is provided with two grooves 29 arranged one beside the

  the other and having a cross-section of form Tra Déz> 'dale s'Mlar-

  protruding outward, while the brake shoe 27 'has two corner segments 30 placed at the same distance one beside

  the other and nestling in the throats 29.

  In the exemplary embodiment shown in FIG.

  brake components correspond to the components shown in the figures

  1 and 2 However, the wheels have different structures from each other.

  Each of the ball bearings shown in FIG. 4 carries a wheel flange 31, 32, said flanges being able to rotate independently of each other and carrying, on the one hand, each their own attached flange 22,

  on the other hand, because they are interconnected by annular bridges

  sections 35 and 34 in an axial direction, a structure which

  supports the wheel cylinder 19 Between the tubes, it is also planned

  an annular braking body, in accordance with what has been shown in FIG. 2 and having an external toothing 24,

  while a brake shoe 27 provided with an internal toothing corres-

  28 is fixed on the dorsal portion 26 of the wheel fork 10.

  In the exemplary embodiment shown in FIGS. 5 and 6, the tire portions 18 comprise an annular intermediate volume and the wheel cylinder 19 is constituted directly by the bearing ring of the wheel rim 17. In the annular intermediate volume, the wheel rim 17 is surrounded by a centering ring 36 which is itself surrounded with a relatively large clearance by a ring-shaped brake body 23 which is arranged between the tubes 22. The centering ring 36 disposed between the tire portions 18 or the flanges 22 and surrounding the cylindrical portion 19 of the wheel rim 17, maintains, on the one hand, the flanges 22 at a certain axial distance from each other on the rim of wheel 17 and it comprises, on the other hand, a raised central annular portion which is provided with recesses 38 from its outer periphery 40, oriented approximately in a peripheral direction and by which are formed on the outer side The resilient tongues 39 comprise at their free ends support heads 41 which bear against the inner periphery of the brake ring 23 and which hold the latter in a manner which prevents them from moving. position centered relative to the axis 11 For this purpose, it is possible to arrange each time as shown in particular in FIG 5 two recesses 38 in opposition in such a way that the tabs

  Elastics 39 thus formed constitute a pair of springs.

  To achieve a safer centering, it is advantageous to distribute three pairs of centering members 39 at equal intervals on the periphery.

of the centering ring 36.

  In all the rolling devices described above,

  above, the ball bearings 16 and, if appropriate, the wheel rim 17 or the wheel flanges 31 and 32, are covered axially outwards by covering flanges 33 which are held on the axis 11 between the In this way, one avoids, on the one hand, a fouling of the bearing zones and on the other hand, one obtains a fouling of the bearing zones.

  more aesthetic appearance of the rolling device.

  As long as a rolling device such as those of Figures 1 to 4, is placed on a flat ground and as the flanges 22 rest on this ground, the brake body 23, 23 'of circular shape rests freely on top of the wheel cylinder 19, so that the wheel can rotate freely around its axis 11 However, when the rolling device arrives on a conveyor belt 20 provided with ribs 21, the beads 22 penetrate the existing intervals between the ribs 21, whereas the outer periphery of the rim 21, and the rim 21,

  the latter to the position represented on the "o '- l

  as against the brake shoe 27, 27 Ansi, in the S of rli-.

  FIGS. 1, 2A, 24b and 28b are intertwined with each other, and the wheel rolling device is shown in FIG. 3, when the braking co-happens on the grooves 21, the grooves 29 are compressed against the corner portions 30 of the brake shoe 27 'and prevent a "Va-irn of" rp S braking 23 'by conjugation of forces, spell u "' éamcnt c dis"

rolling load is braked.

  As long as, in the embodiment shown in FIGS. And 6, the rolling device is on a flat floor, and as long as the flanges 22 rest on this floor, the circularly shaped braking body 23 remains in the position centered with respect to the axis 11, which is shown in the Figures, so that the wheel can rotate without

  However, when the rolling device is

  The ribs 22 penetrate the intervals between the ribs 21, while the ribs come into contact with the outer periphery of the ring-shaped braking body 23 and lift the latter.

  in a locking position by applying it against the brake shoe 27.

  Consequently, the teeth 24 and 28 engage one into the other by

  combination of shapes and prevent the roll from moving.

  However, it goes without saying that the brake ring 23 could comprise, in place of an external toothing 24, also grooves or profiled parts increasing the frictional or conjugate coupling.

of forms.

  Of course, the present invention is not limited to the embodiments described and shown; she is likely to

  numerous variants accessible to those skilled in the art, according to the

  envisaged and without departing from the spirit of the invention.

t; 5255 'i 7

Claims (9)

  l. Rolling device for a transporter carriage displaces in the mair, in particular a shopping trolley, comprising a wheel provided with strands placed at a distance from one another and arranged to penetrate into grooves of a conveyor belt, said wheel being provided with a braking body, disposed between the struts resting on the   ribs of a conveyor belt, which has the shape of a circular ring   a smaller diameter than the strands and which clings with its inner periphery and with play on a cylindrical portion of the wheel disposed between the strands, lareunéantant mounted on an axle held in a fork, characterized in that a shoe of brake (27, 27 ') is fixed on the dorsal part (26) of the wheel fork (10) and in that the ring-shaped braking body (23, 23') is applied from the top against said shoe, when the wheel is pressed down on   the ribs (21) of a conveyor belt (20).   2. Rolling device according to claim 1, characterized in that both the outer periphery of the ring-shaped braking body (23) and the braking surface of the shoe are   brake (27) are provided with a locking toothing (24, 28).   3 rolling device according to claim 1, characterized in that there is provided on the outer periphery of the braking body (23 ') in the form of a circular ring at least one groove (29) having a widening trapezoidal cross-section. outwardly, and in that the brake shoe (27 ') has at least one wedge segment (30)   nestling in this groove (29).   4. Rolling device according to any one of the claims   1 to 3, characterized in that the flanges (22) form part of the wheel cylinder (19), which consists of two tire portions (18) engaged on a wheel rim (17) and which are held axially   applied against each other without the possibility of rotation.   5. Rolling device according to any one of the claims   1 to 3, characterized in that the wheel cylinder (19) is constituted by two wheel flanges (31, 32), mounted independently of one another on the axle (11), each wheel flange comprising his own boudin (22).   6. Ro'i-3 eic Or device, - ,: "e-s   cations i 2 3 to be charac- terized in I '; pre u ,; the first   braking (23) and the cyilindrical portion of wheel Ti, e S f-; e   centering (39) elastically Y-ibe.   7 Bearing device Seon 'a r 4 v' N I e is that in that the centering elements esq: e; re, LSI -: on, part of a centering ring t 6; i discussed; They (22) and mounted on the part y -ind *, ie the centering members (39) are attached to the body braking means (23) place said braking body, in normal shape, in a concentric arrangement and at a uniform distance from the outer periphery (40) of the centering ring. (36).   8. Rolling device according to claim 7 characterized in that the centering ring (36) cormporte several elastic tabs (39) distributed at equal intervals on its outer periphery (40) and applying by their free ends against the periphery   inside of the braking body (23).   Bearing device according to claim 8, characterized   in that the resilient tongues (39) are formed by   dements (38) oriented approximately in a circumferential direction and formed in the centering ring (36) and in that each time two resilient tongues (39), supported by their free ends (41) against the inner periphery of the brake body (23) are joined to form a pair of springs, and in that three pairs of springs are distributed at equal intervals on the periphery of the ring of centering (36).