MXPA96003935A - Positioning device for wheels, activated by vehic - Google Patents

Abstract

The present invention relates to an automatic vehicle-driven wheel chock device for at least one rim of a vehicle, characterized in that it comprises a coupling mechanism for initially coupling with a rim of a vehicle as the rim rotates to a a spring, a shim mechanism to immobilize the rim and that can be activated once the rim is coupled by the coupling mechanism and a connector that connects to the coupling mechanism and the shim mechanism to move them together towards the spring in response to the rolling movement of the llan

Description

DEVICE POSITIONER OF WHEELS FOR WHEELS, ACTIVATED BY VEHICLE FIELD OF THE INVENTION This invention relates to positioner devices of shims for wheels activated by the vehicle and, in one embodiment, with those that are provided with a self-leveling platform.

BACKGROUND OF THE INVENTION Although the trucking industry has some standards, most are the result of federal regulations. For example, trucks that deliver goods on a dock, on a surface that supports the vehicle, can be a tractor and a trailer, a tractor trailer with semitrailer or a straight van. In all this specification and in the appended claims the term "Raceway" is used to refer to each surface that supports a vehicle in the broadest sense, including in a non-limiting sense, roads, access road (s), ramps, bridges, pits, levellers or similar. In all these situations, the position of the wheels with respect to the raceway, the position of the spring and other wheels may vary. Therefore, there is a need to place a shim in a position of P1272 / 9oMX fits specifically with respect to the vehicle wheel, the raceway or an associated loading dock or other loading facility. In this description, each time the terms "spring", "loading dock", "dock position" or similar are used, it is intended to include, in a general sense, the high loading docks, the fluid terminals and the stations cargo of all kinds where a positive and safe positioning of a vehicle is desired. Additionally, the term "rim" includes a wheel and a tire mounted so that they rotate in a vehicle. Also, since the height of the back of the truck may not be standardized or standardized, a spring leveling device may be necessary as the trailer is loaded or unloaded. It is known practice to raise or lower the level of the trailer to match the spring or spring leveling device as the truck is unloaded / loaded. Therefore, it is imperative that the trailer be shod so that it can be loaded and unloaded safely without regard to the type of vehicle being serviced or the position of the vehicle's wheel relative to the loading dock. This type of trailer leveler with a shim is found in U.S. Patent No. 4,969,792, assigned to Kelley. However, with trailers that P12V2 / 9oMX has a third floating axis, as can best be seen in Figure 1 illustrating this prior art, the shims may become inefficient for the immobilized. Therefore, there is a need in the industry to provide an automatic shoe positioning device that fits the trailer, double semitrailer or van as it is automatically positioned without considering the position of the wheels relative to each other and to the spring. Therefore, a primary objective of this invention is to provide an automatic vehicle positioning device activated. A further object of this invention is to provide this integrated shoe positioning device at a rolling and rolling track location.A further objective of this invention is to provide a loading ramp that can be raised to a degree that provides, in combination with the dock leveler, an exit / entry ramp from / to the hold for the trucks handling the material Additional objectives of the invention will be apparent to one skilled in the art when considering the following summary of the invention and the more detailed description of the preferred modalities P1272 / 96MX illustrated herein.

SUMMARY OF THE INVENTION According to a first aspect of the invention, there is provided a positioning device for wheel shims, driven by vehicle, for at least one rim of the vehicle that rotates on a raceway between an initial position and a plurality of operating positions, the shoe positioning device includes: a mechanism that can be coupled by that rim in the initial position and that can be moved with the rim as it rolls on the raceway; a shim that can be placed behind the rim when the mechanism is in any of the operating positions in response to the coupling of the mechanism by the wheel rim; a connector between the mechanism and the shim and; a controllable safety capable of selectively securing the shim in a position immobilized behind the rim and corresponding to one of the operating positions. In one embodiment, the mechanism can be a resiliently urged arm that engages with the side portions of the spring of the rim and, when engaged, the continuation of the movement of the trailer fits a delayed portion of the rim next to the rim. the loading / unloading position effected by the movement of the trailer P1272 / 9bMX up to the spring position. In this mode, the connector is a moveable truck. According to a preferred embodiment of the invention, the automatic shoe positioning device can be located on or in a raceway connected to a loading spring and, in one embodiment, in a pocket adjacent to the spring. The shoe positioning device can be located with a self-leveling ramp, the shoe positioning device includes a connector that can be moved from an initial position to a plurality of operating positions, one of which becomes the position of It operates by activating a controllable safety. According to another aspect of the invention, there is provided an automatic positioning device for wheel shims comprising a support member having a first end and a second end and which is supported, in a pivotable manner, close to one end thereof. on a support surface and is movable substantially vertically in proximity to the other end thereof, to level the floor of a trailer relative to a fixed loading spring or, alternatively, a movable spring plate provided with the spring of load, the support member has provided in the same recessed channel. The support member has at least one device Pl? 72 / 9oMX positioning of wheel chocks activated by vehicle, as described above, mounted therewith for vehicle-activated movement, from an initial position where the wheel chock positioning device 5 is located remote from the end of the spring of the support member, to easily engage with the rim of attack of a vehicle, to operating positions where the wheel chock device is located behind a vehicle rim and moves with the rim l, up to the operating position to immobilize it where the safety is activated to provide the shimming position. The device preferably has a wheelbarrow or other connector that can move in the channel and that connects and carries both the drive mechanism coupled by the wheel as to the shoes. The position of the shim is established by a lock providing the interconnection between the support member and the connector to restrict the movement of the connector towards the initial position. The insurance is selectively deactivated to allow the device returns to the starting position. In one embodiment, the securing device further comprises a movable member within the channel, wherein the member secures the truck in the shim position, preferably the truck includes a means of detention provided with it to engage with the environment Stop P1272 / 9oMX located with the movable member to secure the truck in the shim position. Preferably, the movable member moves in the channel by a driving means and, preferably, by a hydraulic cylinder. In one embodiment, the member has ratchet-like teeth and notches that mate with the ratchet type teeth located in the base of the truck. In another embodiment, the front means of the truck is pushed resiliently in order to accommodate wheels of varying sizes. In accordance with another aspect of the invention, the support member may further comprise a secondary guide channel for a guide member of the forklift or shifting arm of the truck, wherein when the truck moves from the initial position, the guide secondary directs the delay means or shim from the initial position to the operating position.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be illustrated with respect to the following drawings which illustrate the embodiments of the invention and in which: Figure 1 constitutes the prior art as described in the background of the invention. Figure 2 is a schematic side view of P1272 / 96MX, the invention illustrated in a preferred embodiment of the invention. Figure 3 is a side schematic view of the invention integrated to a loading platform illustrated in a preferred embodiment of the invention. Figure 4 is a view similar to that of Figure 3 illustrating the rearmost T2 rim of a trailer T that. It is fully shifted when the trailer T is close to the dock T. Figure 5 is a side schematic view of the invention of Figure 4, where the trailer has already exited and the platform portion 20 is pivoting to provide, in combination with the self-leveling spring plate 41, an inlet or outlet ramp to the spring D for the trucks handling the material, and illustrated in a preferred embodiment of the invention. Figure 6 is a top plan view of the invention of Figures 3, 4 and 5. Figures 7 and 8 are schematic end views of the invention installed within a platform 50, as seen in Figure 3, view from the dock (Figure 7) and facing the dock (Figure 8), respectively, and illustrating the immobilization of the rim from both sides of the rim T2. Figure 9 is a front view of a single P1272 / 96MX fitting device installed inside u? fozo and illustrated in a preferred embodiment of the invention. Figure 10 is an exploded side view of the components providing securing of the truck within the channel C of the discharge chute and illustrated in a preferred embodiment of the invention. Figures 11 to 15 illustrate in a schematic side view the immobilization of the rim T2 from the point where the rim T2 approaches the shim from Figure 11 to the capture of the rim T2 in Figure 14 and the securing of the rim. the same in Figure 15. Figures 16 to 18 illustrate the release sequence of the rim T2 as the trailer moves from the ramp and the loading / unloading dock, all Figures are illustrated in a preferred embodiment of the invention. Figures 19, 20 and 21 illustrate the flexibility of the shim device to accept varying tire sizes, illustrated in a preferred embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES OF THE INVENTION Referring now to Figure 1, the prior art showing a trailer T docked on a transit surface S in a spring D.

??? / MX JE1 spring is provided with a discharge device for fitting the trailer wheels as taught in the prior art of US Patent No. 4,969,792 to Kelley. Due to the ability of the shim to move from the dock entrance a total of 16 feet, if the trailer is using a floating shaft F, which is very common in the trucking industry today, then the dimensions of the device as taught in the Kelley patent will prevent the shim K from coming out of the retention cavity and moving against the TI rim. This is a very dangerous condition since now the truck is being loaded or unloaded without an appropriate shim system that has a positioning and immobilization device. Referring now to Figure 2, there is illustrated a shim system having a positioning and immobilization device of the present invention, wherein a trailer T is docked at a conventional spring D with the shim 10 being able to move from a position A passing by a position A to a position B, as the rear rim T2 first engages with the arm 15 of the shim 10, thereby moving the shim device __ in the C channel to position B, where the shim it is in the completely immobilized and secured position. It will be noted that the device fits all the time I'1 '72 / 1 »JMX ^ captures the rear rim T2 of attack so that potentially there is no possibility of misuse of the device. The capping device 10 is provided with a front arm 15 and with a mechanism including a delayed arm 16 coupled with a truck-shaped connector 17. The truck 17 is part of a system 5 that includes a C-channel and is movable on the wheels W inside the channel C when the rearmost tire T2 engages with the arm 15 in the position A. By doing this, the arm 16 which is normally under the surface of the raceway S, will be removed by the backward movement of the truck 10 as the movement of the rim T2 forces the truck to move towards the rearmost position B. this, the arm 16 due to the inclined cam surface C ^ of the channel C will cause the arm roller 16 and, specifically the roller 16c to travel on the inclined portion Ci until the moment when the roller 16c rests on the upper edges of the surface 50 and can not move in any other direction than the upward inclined position, as best seen in position B of Figure 2. In this position, the shim is fully activated and is preferably secured. As best seen in Figure 7, the immobilization can take place on one or both rear tires T2.

P1272 / 96MX Since the shimming device of the present invention engages with the rear rim that is most accessible from the trailer, double semitrailer or van, there is no possibility that the shim will fail to immobilize the wheels and, specifically, the most accessible rear wheel T2 of the trailer T. Referring now to Figures 3 and 6, another embodiment of the invention is illustrated in which the shim 10 is installed with a movable support such as a platform 20, where the combined device works together with a leveling plate 40 of the spring located in the spring D. The support 20 therefore has a support surface 21 which is able to be moved by a cylinder 26 that allows the admission of variations in the height of the floor of the trailer in relation to the dock, when the trailer is loaded and unloaded. The support 20 also provides a certain degree of leveling. The support 20 therefore includes a pivot Pa close to the front thereof around which the support 20 will move, as best seen in relation to Figure 5. The fitting device as best seen in relation to Figure 6 in conjunction with Figures 3 and 4, it is located on the C-channel and the arm 15 is therefore engaged by the rim T2 shown here, on both sides of the vehicle, in a position shown substantially in the P1272 / 9ÓMX r Figure 3 where the arm 15 which is pushed by a torsion spring 15b is coupled to the rim T2 as it moves towards the spring D. Therefore the arm 16, at that particular moment, remains below the surface of the support 20 up to the moment when the roller 16c is transported on the cam surface Ci as the truck 17 moves towards the spring D. The roller 16c will eventually rest on the edges of the surface 50 above the channel C and tires will rest on the surface 21 of the support 20, capturing the other side of the delayed running surface of the rim T2. The continuous movement of the rim T2 towards the spring results in the movement of the truck towards the position best seen in Figure 4, where both the running surface of attack and the delayed rolling surface of the rim- T2"They are captured by the arms 15 and 16, respectively, and the roller 16c is positioned firmly on the upper edges of the surface 50 above the channel C so as to prevent the arm 16 from moving downwards and therefore providing a very positive locking device 10. A ratchet-like securing bar 30 as best seen in Figure 10 is operated by a hydraulic cylinder 35 for pulling the ratchet portions 31 into the bar 30 and the grooves in the bar, guided by portions not P1272 / 96MX Crotched, of the channel C in relation to the ratchet portion 17b found in the base of the truck 17, thus securing by ratchet action the truck in its shifted position finally secured adjacent to the spring. The truck is now in a safe position to be loaded and unloaded. Referring now to Figure 5, the support 20 is illustrated with the spring end 22 moving substantially vertically to a position that - cooperates with the spring plate 41 and together provide an entry or exit ramp for the trucks that handle the material to and from the dock and the roadway. In this position, as best seen in Figure 6, the shims are separated by approximately 6 feet and the trucks handling the material can move between them without any problem.

Referring to Figure 6, the top view of the support 20 and the support surface 21 relative to the shim 10 is clearly illustrated. The slot in the C channel and the ability of the shim to be actuated by the The truck and moving from its initial position shown in front of the channel C to the rear of the channel C adjacent to the spring D and the spring plate 41 are also illustrated. The front arm 15 is always hooked by the rim T2 first and the arm P1272 / 9? MX delayed 16 rests inside a well WE, as best seen in the shaded area of Figure 9, until the time when the truck's T2 rim engages or engages arm 15 and arm 16 is extracted by the movement of the rollers 16c against the inclined cam Cl of the channel C Referring now to Figures 7 and 8 together with Figure 2, the shim 10 installed in a single channel located permanently along the surfaces is illustrated. of support. The support member 50 whose upper part defines a supporting surface 21, provided therewith, therefore has a channel C into which the shim 10 will move from a position where the arm 16 is substantially below the upper surface 21 of the support member 50 to a position as best seen in Figure 8. Therefore, the rollers 16a and 16b are provided in the arm 16 to engage the rim T2 proximate the delayed side thereof, as this is the case for the arm 15. However, the roller 16c of the arm 16 as can be clearly seen in Figures 7 and 8, will secure the arm 16 in its operating position due to the engagement with the surface 50 along the C-channel Referring now to Figure 9, a single shim device is illustrated in a hole with a wheelbarrow 17 P1272 / 96MX Movable in the hole as an alternative embodiment of the invention. Only arm 16 is clearly illustrated in the Figure 9, however, the mechanics and operation thereof are very similar to the remaining illustrations and those skilled in the art will appreciate the operation. Referring to Figure 10, the truck 17 and the securing member 30 separated from the C-channel are illustrated to illustrate the interrelation of the components. The truck 10 therefore includes the arms 15 and 16 adjacent to each side thereof and the arm 15 is resiliently urged by a torsion spring 15b secured by the portions 15c and 15d close to the teeth thereof. Therefore, when the rim T2 engages the arm 15 by the roller 15a, the arm will be under compression of the spring 15b.

The different tire sizes cause the arm to move towards the positions as best seen in relation to Figures 19 to 21. However, the arm 16 will be secured in a permanent position due to the engagement of the roller 16c with the supporting surface 50 along the channel C. Therefore, the wheels W move the truck 17 from the initial position, where the rim of attack T2 of the truck is coupled to the arm 15 while the arm 16 is recessed inside the channel C below the level of the ramp surface 21 until P1272 / 9ÚMX / * s raised to an operating position where both arms align with the rim. As best seen in Figure 15 and 16, an operating position becomes an immobilization position in which the securing member 30 is moved by a cylinder 35, as best seen in relation to Figure 15, to cause the ratchet portion 17b of the truck 17 engages with the ratchet portion 31 in response to the openings 32 of the bar or ratchet member 30, traveling over the portions (not shown) of the C-channel, thereby securing the and the shoe mechanism 10 in its final immobilized position adjacent to the spring. Referring to Figures 11 to 15, a sequential view of the movement of the rim of attack is illustrated.

T2. The rim T2 therefore moves on the surface S support and approaches the arm 15 sitting in a position to ensure that the rim T2 will be coupled to the arm 15. As seen in relation to Figure 6, since there may be duplicates of the shim on each side of the truck , it is assumed that the driver is operating the truck correctly and that it is going back to the dock correctly. The rim T2 therefore engages with the arm 15 of the shim 10 and will thereby actuate the shifter in turn.

P1272 / 96MX; * 1 C channel to the dock. Accordingly, the wheelbarrow will provide movement of the truck within the channel C. The ramp portion Ci of the channel C keeps the arm 16 in a lowered position as shown in Figure 11, until such time as the roller 16c begins to travel over the inclined portion Cl of the ramp when the arm 16 engages the rim, as best seen in relation to Figure 14. The inclined Cl acts as an operator for the pivot arm 16. The complete movement of the truck to the various operating positions is effected by the movement of the tire only. In addition to being activated by the movement supplied by the truck itself, there is no operating mechanism for the truck to move. The change of the device from an operating position to an immobilization position is effected j by the cooperation of the ratchet 17b of the truck with the ratchet 31 controlled by the operator. When the arm reaches the position established in Figure 14, the roller 16c will stiffen the arm 16 providing positive capture of the rim T2 in that position. However, the truck is still free to move in any direction in response to rolling movement of the rim until the time T2 wheel reaches the desired shoe position. As shown in Figure 15, in that P1272 / 9ÓX Position the securing member described in relation to Figure 9 engages with the ratchet portion proximate to the base of the truck. The coupling of the ratchet portion 31 to the ratchet portion 17b is effected by the cylinder 35 which pulls the securing bar 30 to the right causing the upward movement of the bar 30 as the slots 32 travel on the projections of the channel C (not shown). The shim 10 is therefore in its immobilization position so that the truck can be safely unloaded with the rearmost wheel being driven and the truck secured in its loading / unloading position. This will continue until the moment the loading / unloading is finished and when the truck wants to move away from the loading / unloading area. As illustrated in relation to Figures 16 to 18, the inverse of the operation of the shim device occurs. First the cylinder 35 unlocks the ratchet portions of the latch bar and the truck, 31 and 17b, respectively by means of the action of the slots 32. Therefore, the wheel T2 is free to rotate in the direction shown according to the trailer moves away from the loading position, leading the truck to the position shown in Figure 17 where the arm 16 will again move down away from the wheel T2 and will hide below the surface of the P1272 / 96MX - raceway S and in the WE well of channel C to allow the wheel T2 to pass over it as best seen in Figure 18, while the front arm 15 remains in position for the next truck that approximates. In doing so, clearly the portion 16c of the arm 16 allows the arm travel back down to its recessed position, as best seen in its final recessed position in relation to Figure 18. Referring now to Figures 19 to 21 , the shim 10 is illustrated by coupling to alternative tire sizes Tx, Ty and Tz by the arm 16 and 15, where a variation of the rim size from 30 inches to 42 inches, for example, can be admitted by the shim with a standard size of truck 17 and arm 16 t 15, due to the nature of spring actuation of arm 15 by means of spring 15b. In this way, the leg arm 16 plays the vital role of the immobilization, while the activation of the arm 15 plays the vital role of bringing the leg arm 16 towards its upward inclined position. Since many changes can be made to the invention without departing from the scope thereof, it is intended that all material contained herein be construed as illustrative of the invention and not in a limiting sense.

P1272 / 96MX

Claims (35)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property; An automatic vehicle-driven wheel chock device for at least one rim of a vehicle, characterized in that it comprises a coupling mechanism for initially coupling with a rim of a vehicle as the rim rotates toward a position on a spring, wedge mechanism to immobilize the rim and that can be activated once the rim is coupled by the coupling mechanism and a connector that connects to the coupling mechanism and the shim mechanism to move them together towards the spring in response to the rolling movement of rim.
2. 2. An automatic truck-mounted wheel chock device for at least one rim of a vehicle, characterized in that it comprises a coupling mechanism for coupling with the vehicle rim as the vehicle moves towards a spring, a mechanism for It fits to immobilize the attack rim of the activated vehicle once the attack rim is engaged by the latching mechanism, where the immobilization takes place substantially in P127 / '> uMX ^ _near the dock, as is done by the movement of the trailer towards the dock and where the shim mechanism is a resiliently pushed arm that engages with the spring side of the rim and, once engaged, the movement Continuum of the vehicle causes the shim mechanism to engage with a delayed edge of the rim that is proximate the spring. The shimming device according to claim 2, characterized in that the arm is located in a movable trolley. The shimming device according to claim 2, characterized in that the automatic shimming device is located inside a hole adjacent to the spring. The shimming device according to claim 2, characterized in that the automatic shimming device is located with a leveling ramp, the shimming device is movable from an initial position to an operating position and finally to an adjacent locking position. to the dock. 6. An automatic wheel shim for cooperating with a vehicle rim, characterized in that it comprises a support member having a first end and a second end and P1272 / 96MX r, < - supported pivotably next to one end thereof on a supporting surface and substantially vertically next to the other end thereof for leveling a vehicle relative to a fixed loading spring or alternatively, in relation to a plate of spring provided on the loading dock, the support member has there provided with a recessed channel, the support member has at least one vehicle-mounted wheel chock device mounted thereon for vehicle-activated movement from an initial position where the wheel chock device is located away from the other end of the support member to easily engage the vehicle's rim, to an operating position where the wheel chock device engages with the rim of attack of the vehicle and moves with the rim to a position of immobilized in where the wedge device is coupled and ensures totalm with the attack rim; the wheel immobilizer apparatus has a means activated by vehicle to move the wheel chock device between the initial and operating positions, wherein the coupling of the apparatus by the wheel moves the wheel chock device from the initial position to the wheel position. position of operation and will finally be secured in the immobilized position and, the movement of the vehicle P1272 / 9uMX 1 moving away from the immobilized position moves the wheel chock device from the operating positions to the starting position. 7. The immobilization of the wheels according to claim 6, characterized in that the attack rim has a portion of the running tread band and a delayed tread position and wherein the shimming device further comprises a trolley movable in the channel and having a first forward means for engaging the tread of attack of the rim in the initial position and, a delayed means to engage with the delayed tread of the rim, this latter coupling is effected by the movement of the vehicle as the vehicle moves from the initial position towards the operating position and, a securing means to secure the truck in the immobilized position. The device according to claim 7, characterized in that the front means is an arm. 9. The device according to claim 7 ú 8, characterized in that the delayed means is an assurance arm. The device according to claim 7 or 8, characterized in that the front means is resiliently pushed to accept any size of rim. P1272 / 96MX 11. The apparatus according to claim 6, characterized in that the support member is movable from a first position wherein the spring end of the support member is flush with the support surface to a position where the member is located at an angle to the support surface and is used together with the spring leveling plate as an exit / entrance ramp to the quay, for example, by a truck handling material. The apparatus according to claim 6 or 7, characterized in that it further comprises a securing device having a movable member located within the channel, wherein the member secures the device in the immobilized position. The apparatus according to claim 12, characterized in that the device includes a device means provided therewith for coupling with a member means located in the movable member to secure the device in the immobilized position. 14. The device according to claim 12 or 13, characterized in that the movable member moves in the channel by means of a drive member. 15. The device according to claim 14, characterized in that the drive member is a hydraulic cylinder. P1272 / 96MX 16. The device according to claim 13, characterized in that the member means ti = ne. Ratchet-like grooves and notches that engage with the ratchet type teeth of the device means located in the base of the device. The device according to claim 7, characterized in that the front means of the truck is resiliently pushed in order to accept varying tire sizes. The apparatus according to claim 6, characterized in that the support member further comprises a secondary guide channel and the delayed means has a guide member wherein when the truck moves from the initial position of the secondary guide, it guides the delayed means and to the preferred arm from the initial position towards the operating position. 19. A vehicle-driven wheel shim positioning device for at least one rim of a vehicle which rotates in a raceway between an initial position and a plurality of operating positions, the shifting positioning device comprises a mechanism coupling coupling by this rim in the initial position and movable towards the operating positions with the rim as this wheel or turns on the raceway, a positionable shoe P1272 / 9bMX - behind the rim when the mechanism is in Controllable safety capable of selectively securing the shim in an immobilized position behind the rim corresponding to any of the operating positions. The device according to claim 19, characterized in that it includes a connector that interconnects the latching mechanism and the shim in a separate relationship. The device according to claim 19, characterized in that the shim is a pivotable arm that rotates towards the position behind the rim in response to the coupling of the rolling rim with the mechanism and the movement towards the operating positions. 22. A system characterized in that it includes the device of claim 21, a channel extending along the raceway and a connector in the channel that transports the device between the initial position and the operating positions. 23. The system according to claim 22, characterized in that in the channel includes an operator engageable with the shims to position the shims behind the rim as the device moves from P1272 / 9uMX the initial position to the operating position. 24. The system according to claim 22, characterized in that it includes a leveling ramp located on the raceway and carrying the channel, the ramp has at least a portion of it movable vertically to alter the vertical position of the rim with respect to the raceway . 25. The system according to claim 23, characterized in that it includes two channels carried by the raceway and located in a parallel parallel relationship to admit two coaxial rims separated from the vehicle. 26. The system according to claim 23, characterized in that the means in the channel includes a connector interconnecting the coupling means and the shim with which they move together 27. The system according to claim 26, characterized in that the medium in the channel includes a cam surface and wherein a portion of the shim engages the cam surface to raise the shim to the position behind the rim as the device moves from the initial position to any of the operating positions 28. The system according to claim 27, characterized in that the controllable safety includes a P1272 / 9ÜMX '. stop transversely movable in the channel between a non-operating condition and an operating condition, the stop and the connector have portions that interact when the stop is in the operative condition to secure the device in the immobilized position. 29. The system according to claim 27, characterized in that the interconnection portions of the connector and the stop are ratchet teeth. 30. A vehicle-driven wheel shifting positioning device for at least one rim of a vehicle, which rotates on a raceway, the shifting positioning device is characterized in that it comprises a channel extending along the length of the tire. the raceway, a coupling mechanism engageable by the rim and movable with the rim along the channel as it rolls on the raceway between an initial position and an operating position of the plurality of operating positions and a movable shim along the channel in separate relationship with respect to the mechanism and positionable behind the rim when the mechanism adopts any of the operating positions in response to the mechanism coupling with the rolling rim. 31. The shoe positioning device according to claim 30, characterized in that it includes P1272 / 9bMX a connector that interconnects the coupling mechanism and the shim, whereby the coupling mechanism and shim moves together in the channel. The shoe positioning device according to claim 31, characterized in that it includes a means of cooperation in the channel and in the shim to move the shim to the position behind the rim when the shim moves to any of the positions of the tire. operation. 33. The shimming device according to claim 1, characterized in that the arm is located in a movable trolley. 34. The shimming device according to claim 1, characterized in that the automatic shimming device is located within a pit adjacent the spring. 35. A vehicle-driven wheel shifting positioning device for at least one rim of a vehicle rotating on a raceway between an initial position and a plurality of operating positions, the trouser positioning device is characterized in that it comprises a coupling mechanism engageable with the rim in the initial position and movable towards the operating positions as the rim rolls on the raceway, a positionable shoe rear P1272 / 96MX of the rim when the mechanism is in any of the operating positions in response to the coupling of the mechanism with the rolling rim and, a controllable safety member having a portion located longitudinally in the channel and movable between an unsecured position and a securing position in coupling with the shim. Pl272 / 9oMX