EP3680209A1 - Magnetic support pad for vehicle lifts - Google Patents

Abstract

The present invention relates to a wedge (100) of vehicle lifts (300) characterized in that it comprises: - A core (10); - At least one magnet (20) fixed on the core (10); coating of elastomeric material (30) entirely enveloping the core (10) and the at least one magnet (20).

Description

TECHNICAL AREA

The present invention relates to a hold of vehicle lifts. It will find its application in particular for vehicle maintenance activities, in which vehicles are lifted on lifts.

TECHNOLOGICAL BACKGROUND

In known manner, the blocks of vehicle lifts are made of rubber and are placed between the bridge and the vehicle in order to protect the lifting points of the vehicle. These lifting points are located on the rebate on each side of the vehicle. Typically a rebate has a length of about 160 mm and a width of about 3 mm. The shims are then sized to be in contact with the entire rebate.

Patent publication JP 2007 039217 A discloses a vehicle lift block.

When entering and leaving vehicles on the lift, the chocks are removed and placed on the ground near the bridge. The wedges thus positioned obstruct the passage of technicians and cause work accidents (sprains, falls, ...).

Thus, there is a need to provide shims that can be positioned when they are not in use without causing work accidents for the personnel or the customers of vehicle maintenance activities.

The present invention aims to satisfy this need.

ABSTRACT

1. a. Une âme ;
2. b. Au moins un aimant fixé sur l'âme ;
3. c. Un enrobage en matériau élastomère enveloppant entièrement l'âme et le au moins un aimant.

To this end, the invention provides a block of vehicle lifts intended to be positioned on the side of the lift after its use. The hold of vehicle lifts includes:

1. at. A soul ;
2. b. At least one magnet fixed on the soul;
3. vs. A coating of elastomeric material completely enveloping the core and the at least one magnet.

The invention thus provides a block of vehicle lifts which can be positioned on the side of the bridge after use by means of the magnetic attraction of the magnet fixed on the core.

Indeed, the present invention makes the space near the lift less dangerous by allowing a more suitable location for the holds.

Very advantageously, the positioning of the shims on the support is simple to carry out because it suffices to approach the shim of the support sufficiently to allow the adhesion force of the magnet to allow contact with the support.

Advantageously, the present invention allows better maintenance of the wedge on the upper face of the lift. Indeed, the magnetic attraction due to the magnet allows better cohesion between the support and the wedge.

In addition, the combination of a core enveloped by a coating of elastomeric material limits the production costs of the shim unlike the rubber shims known from the prior art. Indeed, the presence of the core makes it possible to limit the cost of the shim by reducing the amount of coating of elastomeric material, the coating of elastomeric material being generally more expensive than the core.

In addition, the core potentially makes it possible to obtain a stiffer shim than conventional shims made entirely of rubber.

Furthermore, the presence of the core makes it possible to thermally isolate the magnet and thus avoid any risk of demagnetization of the magnet when the wedge is subjected to temperatures above 80 ° C.

• d. Fixation de l'au moins un aimant sur l'âme ;
• e. Positionnement de l'âme dans un moule comprenant un canal d'injection ;
• f. Moulage par injection de la matière élastomère, laquelle enveloppe l'âme et l'au moins un aimant dans leur totalité.

Another aspect of the invention is a method of manufacturing a shim comprising the following steps:

• d. Attachment of the at least one magnet to the core;
• e. Positioning of the core in a mold comprising an injection channel;
• f. Injection molding of the elastomeric material, which envelops the core and the at least one magnet in their entirety.

The invention thus provides a simple and inexpensive manufacturing process.

BRIEF DESCRIPTION OF THE FIGURES

• La figure 1A montre une coupe transversale de la cale de ponts élévateurs dans son moule selon un premier mode de réalisation de la présente invention ;
• La figure 1B montre une coupe de dessus de la cale de ponts élévateurs dans son moule selon un premier mode de réalisation de la présente invention ;
• La figure 2 montre une vue extérieure de l'âme de la cale de ponts élévateurs selon un deuxième mode de réalisation de la présente invention ;
• La figure 2A montre une coupe transversale de l'âme de la cale de ponts élévateurs selon un deuxième mode de réalisation de la présente invention ;
• La figure 2B montre une coupe de dessus de l'âme de la cale de ponts élévateurs selon un premier mode de réalisation de la présente invention ;
• La figure 3 montre une vue extérieure de l'âme selon un troisième mode de réalisation la présente invention ;
• La figure 4 montre une vue extérieure de l'âme équipée de deux aimants selon un troisième mode de réalisation la présente invention ;
• La figure 5 montre une vue extérieure de la cale de ponts élévateurs selon la présente invention ;
• La figure 6 montre une vue extérieure d'un pont élévateur sur lequel la cale selon la présente invention se positionne sur le flanc du pont élévateur.

The aims, objects, as well as the characteristics and advantages of the invention will emerge more clearly from the detailed description of embodiments of the latter which are illustrated by the following accompanying drawings in which:

• The figure 1A shows a cross section of the hold of lifts in its mold according to a first embodiment of the present invention;
• The figure 1B shows a section from above of the hold of lifts in its mold according to a first embodiment of the present invention;
• The figure 2 shows an external view of the soul of the hold of lifts according to a second embodiment of the present invention;
• The figure 2A shows a cross section of the soul of the hold of lifting lifts according to a second embodiment of the present invention;
• The figure 2B shows a top section of the core of the hold of lifting lifts according to a first embodiment of the present invention;
• The figure 3 shows an external view of the core according to a third embodiment of the present invention;
• The figure 4 shows an external view of the core equipped with two magnets according to a third embodiment of the present invention;
• The figure 5 shows an external view of the hold of lifts according to the present invention;
• The figure 6 shows an external view of a lift on which the wedge according to the present invention is positioned on the side of the lift.

The drawings are given by way of examples and are not limitative of the invention. They constitute schematic representations of principle intended to facilitate understanding of the invention and are not necessarily at the scale of practical applications.

DETAILED DESCRIPTION

By “support” is meant in particular the upper face or the side of the lift.

By "below the hold" is meant the face of the hold in magnetic attraction with the support.

"Above the hold" means the face of the hold directly in contact with the rebate of the car.

By "elastomer" is meant an elastomer-based material. Hereinafter, the expression “comprised between X and Y” means that the terminals X and Y are included.

Before describing an embodiment of the invention with reference to the drawings, other optional features of the invention, which can be implemented in combination in any combination or in an alternative manner, are indicated below:
Advantageously, the wedge comprises a plurality of magnets.

Advantageously, the plurality of magnets is fixed on a first face of the core.

This allows the bottom of the hold to be magnetized and the top of the hold to be magnetically insulated. As a result, the wedge is held magnetically on the lift and a possible interaction between the magnet and the car is limited.

Advantageously, the plurality of magnets is arranged symmetrically with respect to the center of the first face of the core.

This allows a better distribution of the forces on the plurality of magnets.

Advantageously, the core comprises a first magnet and a second magnet. In a preferred case, we limit ourselves to two magnets to limit the production costs of the shim.

Advantageously, the wedge comprises at least a first magnet of the plurality of magnets and at least a second magnet of the plurality of magnets, which are positioned on the first face of the core so that they are inverted magnetically with respect to each other.

This makes it possible to position two wedges back to back held by their magnets. Advantageously, the core is of rectangular or square shape. Advantageously, the outer contour of the wedge and the outer contour of the core are in morphological homology to define a frame for filling the elastomeric material.

Advantageously, the core defines a volume representing at least 75% of the volume of the wedge, preferably at least 90%.

This makes it possible both to make the wedge robust and at the same time to limit the production costs of the wedge by saving the elastomer material. Advantageously, the core is made of polymer, preferably polypropylene. This makes the block rigid.

Advantageously, the core has at least one through hole.

This allows during the manufacture of the shim, to distribute the elastomeric material within a mold until it completely envelops the core. Advantageously, at least one through hole is located in the center of the core. This allows the elastomeric material to be distributed homogeneously and quickly until it completely envelops the core.

Advantageously, the core has a central through hole and a plurality of lateral through holes, preferably the plurality of lateral through holes is arranged symmetrically with respect to the central through hole.

This allows better diffusion of the elastomeric material. By better is meant faster and more homogeneous until it completely envelops the soul.

Advantageously, the core has a plurality of channels extending from the central through hole to the plurality of lateral through holes.

This allows better diffusion of the elastomeric material from the center of the core to the outside of the core. By better is meant faster and more homogeneous until it completely envelops the soul.

This also allows better preservation of the heat magnets. In fact, the channels will allow the heat to be removed to the outside of the core and to avoid the accumulation of heat near the magnets.

Advantageously, at least one magnet is held by a screw on the core. Advantageously, the core has at least one recess on said first face so that at least one magnet is embedded in the recess.

This allows the magnets to be incorporated into the core and thus to protect them against breakage which may be caused by possible forces exerted by the rebate of the vehicle on the magnets.

Advantageously, at least one magnet is fully integrated in the hollow. This makes it possible to protect the magnets more reliably against their breakage which can be caused by the forces exerted by the rebate of the vehicle on the magnets.

Advantageously, the hollow comprises a convex element and the magnet comprises a concave element in such a way that the concave element and the convex element define a centering system guiding the magnet to be embedded in the hollow.

This allows a better distribution of forces and a better positioning of the magnet.

Advantageously, the first magnet is embedded in a first recess by screwing and the second magnet is guided by the centering system in a second recess.

This makes it possible not to position the magnets in the wrong direction and thus to have the certainty that at least one first magnet of the plurality of magnets and at least one second magnet of the plurality of magnets are positioned on the first face. of the soul in such a way that they are magnetically inverted with respect to each other.

Advantageously, the concave element of the magnet is formed by two holes and a milling of the magnet.

• g. Fixation de l'au moins un aimant sur l'âme ;
• h. Positionnement de l'âme dans un moule comprenant un canal d'injection;
• i. Moulage par injection de la matière élastomère, laquelle enveloppe l'âme et l'au moins un aimant dans leur totalité.
• j. Cela permet l'injection de la matière au sein du moule tout en étant à distance des aimants et ainsi éviter les risques élevés de démagnétisation dues à la chaleur.

Advantageously, the method of manufacturing a wedge comprises the following steps:

• g. Attachment of the at least one magnet to the core;
• h. Positioning of the core in a mold comprising an injection channel;
• i. Injection molding of the elastomeric material, which envelops the core and the at least one magnet in their entirety.
• j. This allows the injection of the material within the mold while being at a distance from the magnets and thus avoiding the high risks of demagnetization due to heat.

Advantageously, during the method of manufacturing a shim, the elastomeric material is injected into a passage formed by the mold injection channel and the opening hole of the core, the opening hole being located opposite the channel of injection.

This allows rapid and homogeneous distribution of the elastomeric material. Advantageously, during the process of manufacturing a shim, retaining pins position the core and the magnet in the mold so that the core is moved away from the bottom of the mold.

This allows the core and magnet assembly to be embedded in the elastomeric material, which is injected into the mold.

Advantageously, the method of manufacturing a shim comprises an adjustment of the height-holding pins so as to adjust the quantity of material of the elastomeric material between the magnet and the underside of the shim.

This makes it possible to adjust the magnetic force of the magnets, as well as their dimensions by moving them away or bringing them closer to the support. For example, a high amount of material between the magnet and the underside of the shim allows better protection of the magnets in the event of forces exerted on the underside of the shim. Furthermore, a small amount of material between the magnet and the underside of the shim allows the use of magnets with a weaker magnetic force or magnets with smaller dimensions. This therefore results in lower production costs for the hold.

Advantageously, during the manufacturing process of a shim, positioning holes belonging to the core position the mold retaining pins.

This makes it easy to position the core in the mold. The positioning holes also allow stable maintenance of the core in the mold. Advantageously, the present invention describes the use of the wedge by magnetic attraction on a lift for vehicle maintenance activity.

Advantageously, the present invention describes a set of shims comprising a first shim and a second shim.

Advantageously, the present invention describes a set of shims in which at least one magnet of the first shim has a reverse magnetic polarity to that of at least one magnet of the second shim so that the first shim and the second shim are 'stack by magnetic attraction, in particular by their undersides, facing facies.

This allows you to position the two chocks back to back to create a double chock used to lift 4x4 and utility vehicles.

The present invention finds a preferred area of application of security during vehicle maintenance activities.

In fact, work accidents (sprains, falls, etc.) are very common during vehicle maintenance activities. During these activities, vehicles are often brought up on a lift. The lifting of vehicles on the lift requires the use of wedges in contact with the rebate on each side of the vehicle, which corresponds to the usual lifting points during maintenance.

However, when no vehicle maintenance is carried out, these chocks are most of the time placed on the ground near the lift. They are then the object of obstacles during the movements of the technicians, who can be brought to strike these wedges and consequently to be injured. As will be described later, the present invention proposes to provide a reliable, simple and economical solution to allow suitable positioning of these wedges near the lift.

In a simple manner, the technicians can, by means of the present invention, position the chocks on the side of the lift instead of positioning them on the ground.

Indeed, very cleverly, the present invention has a magnetic wedge, allowing the positioning and the maintenance of the wedge on the side of the lift.

Thus, by means of the present invention, the ground near the lift is without obstacles and consequently the risks of industrial accident are limited.

We will now describe, according to one embodiment, the present invention through Figures 1A and 1B .

The Figures 1A and 1B represent a wedge 100 during the last stage of its manufacture. This wedge comprises a core 10, completely enveloped by a coating of elastomeric material 30.

Advantageously, the shim 100 comprises at least one magnet 20, preferably two magnets 21, 22. These two magnets 21, 22 are fixed to a first face of the core 11, preferably by screwing. For this, these two magnets 21, 22 have individually in their center two holes of diameter d1 and d2 such as d1 <d2 and a milling. These two holes and the milling define a concave element 52. Thus this concave element 52 allows the fixing the two magnets 21, 22 on the first face of the core 11 by the insertion of a screw. The two magnets 21, 22 are then positioned on the first face 11 of the core 10 in a "first positioning". By "first positioning" means a positioning of the magnet in which the hole of the magnet having the smallest diameter is directly in contact with the core.

By way of nonlimiting example, the shim 100 has a length of between 100 and 200 mm, preferably between 150 and 170 mm. The wedge 100 has a width of between 90 and 150 mm, preferably between 100 and 140 mm. The wedge 100 has a height of between 10 and 60 mm, preferably between 20 and 50 mm. The wedge 100 is preferably designed so as to be able to support a load of between 850kg and 900kg, preferably a load of 875kg.

Advantageously, the core 10 is made of polymer material, preferably polypropylene. By "made of polymer" is meant comprising a polymer. Polypropylene makes the wedge 100 rigid. The core 10 has a thickness between 5 mm and 55 mm, preferably between 15 mm and 45 mm

Preferably, the two magnets 21, 22 are arranged symmetrically with respect to the center of the first face 11 of the core 10. This allows a better distribution of the mechanical stresses on the two magnets 21, 22, as well as better magnetic retention of the entire underside 101 of the wedge 100 on the support.

These two magnets 21, 22 are positioned on the first face 11 of the core 10 so that they are magnetically inverted with respect to each other. Indeed, it is described by the FIG 1A that a first magnet 21 has its North magnetic pole fixed on the first face 11 of the core 10 and that a second magnet 22 has its South magnetic pole fixed on the first face 11 of the core 10. This makes it possible to create a “double block”, higher and resistant to higher forces, by placing two blocks back to back with a set of blocks used to lift 4x4s and utility vehicles whose dimensions and rebate weight are greater than those so-called city cars.

Advantageously, the two magnets 21, 22 are of the Neodymium type (NdFeB). Indeed, neodymium magnets have the greatest strength ratio magnetic / dimensions. They then make it possible to have smaller and thus lighter magnets for the same magnetic force as other types of magnets.

Advantageously, the magnetic force of the magnets 21, 22 is between 60 N and 150 N. This range of values allows both good support of the wedge 100 on the support and easy takeoff of the wedge when it is necessary to remove it from the holder.

Advantageously, the magnet has an adhesive force of between 6 kg and 15 kg, preferably 12 kg.

Advantageously, the magnet has a diameter D of between 25 and 45 mm, preferably between 34 and 42 mm.

Advantageously, the magnet has a height H of between 2 and 8 mm, preferably between 3 and 6 mm.

As mentioned above, the Figures 1A and 1B also represent the last step in the manufacturing process of the wedge 100.

The manufacture of this wedge 100 consists in fixing at least one magnet 20, preferably two magnets 21, 22 on the first face 11 of the core 10, positioning the core 10 in a mold 40, and injection molding of the material. elastomer 30, which envelops the core 10 and the at least one magnet 20, preferably two magnets 21, 22 in their entirety.

Advantageously, the elastomeric material 30 is housed in a filling frame defined by the morphological homology of the outer contour of the wedge 100 and of the outer contour of the core 10.

Preferably, the elastomeric material 30 can be any material comprising, or consisting of, at least one elastomeric material. They may be elastomeric polymers, preferably thermoplastic elastomeric polymers (TPE), preferably thermoplastic vulcanizates (TPV) and / or natural materials such as rubber. TPV is a vulcanized alloy made up of EPDM thermoset rubber particles (ethylene-propylene-diene monomer) completely hardened and encapsulated in a matrix of PP (polypropylene). Optionally, the elastomeric polymers can comprise at least one of EPDM or PP.

Advantageously, the mold 40 has retaining pins 50 at its bottom 42 so that the core is held by the retaining pins 50. These retaining pins 50 are arranged so as to maintain the core 10 symmetrically with respect to its center. In fact, this makes it possible to have better retention of the core 10 in the mold 40. By way of nonlimiting example, the core 10 may comprise four retaining pins 50 arranged symmetrically with respect to the center of the soul 10.

Preferably, the retaining pins 50 of the core can be adjusted so that it is possible to adjust their height according to the quantity of elastomeric material 30 desired between the bottom 42 of the mold 40, corresponding below. 101 of the wedge 100, and the first face of the core 11. The distance corresponding to the length between the underside 101 of the wedge 100 and the face of the magnet 20 not fixed to the core 10 is defined as the " driving distance ”from the magnet.

Thus, this height adjustment makes it possible to adjust the strength of the two magnets 21, 22 by moving them away or bringing them closer to the support on which the wedge 100 is positioned. Indeed, it is known in the technical field of magnetism, that when the magnet 20 is not directly in contact with the support on which the wedge 100 is arranged, the adhesive force decreases very quickly with the distance separating the magnet 20 of the support following the following trend: Table 1 Distance from magnet to holder Variation of the adhesive force F 1 mm F / 2 2 mm F / 4 3 mm F / 8 This then makes it possible to minimize the distance between the two magnets 21, 22 and the support in order to limit the production costs of the shim 100 by using magnets 21, 22 with a lower magnetic force and consequently magnets 21.22 less. Dear.

Advantageously, the size of the two magnets 21, 22 is adjusted according to the driving distance of the two magnets 21, 22. In fact, a smaller driving distance requires magnets 21, 22 of smaller diameter. This then makes it possible to limit the production costs of the wedge 100.

Advantageously, the mold 40 comprises an injection channel 41 located on the top 102 of the wedge 100, preferably facing the center of the wedge 100. Thus, the injection of the elastomeric material 30 within the mold 40 is produced at a distance from the two magnets 21, 22. This makes it possible to avoid demagnetization of the two magnets 21, 22. In fact, it is known in the technical field of magnetism, that under the effect of greater or equal temperature at 80 ° C, NdFeB type magnets can be demagnetized. By "demagnetized" is meant that the magnet at least partially loses its magnetization, that is to say that it adheres less effectively to its support even after having cooled again.

The injection step of the elastomeric material 30 can be carried out at an injection temperature T _injection of between 150 and 250 ° C., preferably between 180 and 220 ° C.

According to one embodiment, the core 10 has at least one through hole 12, preferably at its center. The flow of the elastomeric material 30 into the mold 40 takes place through the through hole 12. In fact, the diameter of the injection channel 41 is smaller than the diameter of the through hole 12. The elastomeric material 30 s 'then flows in its entirety through the through hole 12. The elastomeric material 30 then covers the entire bottom 42 of the mold 40 before filling the remaining empty spaces of the mold. This thus allows better distribution and homogenization of the elastomeric material 30 and also a faster flow rate of the elastomeric material 30. Indeed, if the through hole 12 were not present, the elastomeric material 30 after injection through the injection channel 41 would flow only through the lateral spaces of the mold 40 to drown the core 10 in the elastomeric material 30. Thus, the distribution of the elastomeric material 30 would not be as homogeneous as in the presence of the through hole 12. In addition, the flow rate of the elastomeric material 30 would be slower. Advantageously, the core 10 has a plurality of through holes 12, arranged symmetrically with respect to the center of the core 10. Thus, the flow rate of the elastomeric material 30 is even higher. In addition, the elastomeric material 30 is distributed all the more homogeneously.

According to another embodiment, the mold has a plurality of injection channels 41, arranged facing the plurality of through holes 12.

Very advantageously, the injection channel 41 has a diameter less than the diameter of the through hole 12. Thus during the injection step, the elastomeric material 30 flows directly into the bottom 42 of the mold 40 before filling the remaining empty spaces of the mold 40.

Advantageously, the diameter of the through hole 12 is between 10 mm and 20 mm, preferably between 12 mm and 18 mm.

Advantageously, the shim 100 is covered in its entirety with a slightly more flexible outer layer, preferably of PP-EPDM, preferably including recycled tire.

Preferably, the shim 100 is sculpted on its top 102 and / or its underside 101. In fact, this makes it possible to identify the top 102 and / or the bottom 101 of the shim 100 to avoid the use of the shim 100 to upside down and thus avoid pressing the rebate of the car on the two magnets 21,22 which could cause them to break.

We will now describe according to one embodiment the present invention through Figures 2, 2A and 2B .

The figure 2 shows an external view of the core 10 of the wedge 100 in which the core 10 will be equipped with two magnets 21,22 according to one embodiment.

According to Figures 2, 2A and 2B and the embodiment shown therein, the core 10 has a first hollow 131 and a second hollow 132 on said first face 11 so that a first magnet 21 and a second magnet 22 are embedded respectively in the first hollow 131 and the second hollow 132. Indeed, during the maintenance of a car, it is possible that the technician is mistaken in the direction of positioning of the wedge 100 and positions the underside 101 of the wedge (magnetic side of the wedge) in contact with the rebate of the vehicle. This embodiment makes it possible to incorporate the two magnets 21, 22 into the core 10 and thus to protect them against breakage which may be caused by the forces exerted by the rebate of the vehicle on the two magnets 21, 22.

Preferably, the two magnets 21, 22 are fully integrated in the two recesses 131, 132. In fact, in the case mentioned above in which the technician positions the underside 101 of the wedge 100 in contact with the rebate of the vehicle , the distance separating the two magnets 21, 22 from the rebate of the vehicle is even greater than in the case mentioned in the previous paragraph. Thus the two magnets 21, 22 are better protected against their breakage. Preferably, the two magnets 21, 22 have a thickness less than the thickness of the two recesses 131, 132, e _magnet <e _recess so that the two magnets 21, 22 are slightly more embedded in the two recesses 131, 132 than in the two cases described in the two preceding paragraphs. Thus during the step of injecting the elastomeric material 30, the elastomeric material 30 will cover an empty space 16 left by the difference in thickness of the magnet 20 and the recess 13. Consequently, the two magnets 21, 22 are better protected against breakage.

The magnetic force of the two magnets 21, 22 is adapted according to the percentage of embedding of the two magnets 21, 22 in the two recesses 131, 132. In fact, the higher the percentage of embedding, the more the magnetic force necessary for the proper maintenance of the two magnets 21, 22 on the support will be great because the two magnets 21, 22 will have a greater driving distance. Advantageously, a first hollow 131 comprises a convex element 51 and a first magnet 21 comprises a concave element 52 so that the concave element 52 and the convex element 51 define a centering system 50 guiding the first magnet 21 to fit into the first hollow 131.

Advantageously, the concave element 52 of the first magnet 21 is defined by the two holes of diameter d1 and d2 and the milling of this first magnet. Thus during the step of inserting the two magnets 21, 22 into the core, it suffices to position the first magnet in the inverted state. By “inverted state” is meant a state of positioning of the magnet in which the hole of the magnet having the largest diameter is directly in contact with the core.

Thus this concave element 52 allows the first magnet 21 to be embedded in the first recess 131 by cooperating with the convex element 51 of the first recess 131.

Advantageously, the second magnet 22 is positioned in the second recess 132 in the initial state in order to allow the second magnet 22 to be screwed onto the second recess 132.

Thus the convex element 51 and the concave element 52 cooperating together define a centering system 50 guiding the first magnet 21 to fit it into the first hollow 131. This centering system 50 then serves as a polarizing device. In fact, the advantage of this embodiment is that it allows the first magnet 21 and the second magnet 22 to be positioned in such a way that they are magnetically inverted with respect to each other. If the core did not have a centering system 50 guiding the first magnet 21 to be embedded in the first hollow 131, the positioning of the two magnets 21, 22 on the first face 11 of the core 10 could be incorrect and the wedge 100 could have two magnets 21, 22 oriented magnetically in the same direction.

The invention allows the creation of a “double wedge”, higher and resistant to higher forces, by placing back to back two wedges of a set of wedges used to lift the 4x4 and utility vehicles whose dimensions and rebate weights are higher than so-called city cars.

Another advantage of this centering system 50 is that it allows a better distribution of the forces exerted on the contour of the first hollow 131.

The embodiment described by Figures 2, 2A and 2B is not limiting to two magnets 21, 22 and to two recesses 131, 132, in fact the wedge 100 can comprise a plurality of magnets or a single magnet and the core 10 can comprise several recesses or a single recess 13.

We will now describe according to one embodiment the present invention through figures 3 and 4 .

According to figures 3 and 4 , and the embodiment shown therein, in addition to the features already described by the Figures 2, 2A, 2B and / or the characteristics already described by Figures 1A, 1B and the second embodiment, the core 10 comprises a central through hole 121 and a plurality of lateral through holes 122 so that the plurality of lateral through holes 122 are arranged symmetrically with respect to the central through hole 121 .

Preferably, the core 10 has, preferably on its first face 11, a plurality of channels 14 extending from the central through hole 121 to the plurality of lateral through holes 122.

Thus, better diffusion of the elastomeric material 30 is obtained. By better is meant faster and more homogeneous. In fact, during the injection, the elastomer material will be able to flow from the central through hole 121 towards the lateral through holes 122. In addition, once the elastomer material 30 completely covers the bottom 42 of the mold 40, it s' extends through the lateral spaces but also through the lateral through holes 122 so that it can cover all of the empty spaces inside the mold 40.

In addition, this better diffusion of the elastomeric material 30 allows better preservation of the two magnets 21, 22 from the heat since this makes it possible to prevent the heat from accumulating at the bottom 42 of the mold 40 and consequently close to the two magnets. 21, 22. Thus, the risks of demagnetization are all the more avoided.

Preferably, the lateral opening holes 122 are oblong in shape while being elongated in the lengthwise direction of the core 10.

Advantageously, the core 10 comprises positioning holes 15 intended to correctly position the retaining pins 50 of the mold 40. These positioning holes 15 make it possible to easily position the core 10 in the mold 40. The positioning holes 15 also allow stable maintenance of the core 10 in the mold 40.

The figure 5 shows an exterior view of the lift 100 wedge 300 according to the present invention. The wedge 100 is shown there in a rectangular shape. This shape is not limiting, in fact the wedge 100 can for example be square or circular.

The figure 6 shows an external view of a lift 300 on which four wedges 100 of a set of shims according to the present invention is positioned on the side 301 of the lift 300.

According to another embodiment, the four wedges 100 can be positioned on the upper face 302 of the lift 300 so as to be in contact with the car rebate during its maintenance.

According to another embodiment, the shim set contains at least two shims, preferably four shims, preferably eight shims.

Although one or more preferred embodiments of the invention are described in the present description, it should be understood that the invention is not limited to this or these modes, and that variations may be made.

REFERENCES

• 100. Wedge
• 101. Bottom of the hold
• 102. Above hold
• 10. Soul
• 11.1 ^st face of the soul
• 12.Hole opening
• 121. Central through hole
• 122. Side through holes
• 13 Hollow
• 131. First trough
• 132. Second hollow
• 14Rigoles
• 15 Positioning holes
• 20. Magnet (s)
• 21. First magnet
• 22. Second magnet
• 50. Centering system
• 51. convex element
• 52. concave element
• 30 Coating
• 31 Filling frame
• 40 Mold
• 41 Injection channel
• 42 Mold bottom
• 50. Holding nipple
• 300. Lift
• 301. Side of the lift
• 302. Upper face of the lift

Claims (15)

Wedge (100) of vehicle lifts (300) characterized in that it comprises: at. A soul (10); b. At least one magnet (20) fixed on the core (10); vs. A coating of elastomeric material (30) entirely enveloping the core (10) and the at least one magnet (20). Wedge (100) according to the preceding claim, which comprises a plurality of magnets (20). Wedge (100) according to the preceding claim, wherein the plurality of magnets (20) is fixed on a first face (11) of the core (10). Chock (100) according to any one of the two preceding claims, in which at least a first magnet (21) of the plurality of magnets (20) and at least a second magnet (22) of the plurality of magnets (20 ) are positioned on the first face (11) of the core (10) so that they are magnetically inverted with respect to each other. Shim (100) according to any one of the preceding claims, in which the outer contour of the shim (100) and the outer contour of the core (10) are in morphological homology to define a filling frame for the elastomeric material (30 ). Shim (100) according to any one of the preceding claims, in which the core (10) is made of polymer, preferably polypropylene. Wedge (100) according to any one of the preceding claims, in which the core (10) has at least one through hole (12). Wedge (100) according to the preceding claim, wherein at least one through hole (12) is located in the center of the core (10). Wedge (100) according to any one of the two preceding claims, in which the core (10) has a central through hole (121) and a plurality of lateral through holes (122), preferably the plurality of lateral through holes ( 122) is arranged symmetrically with respect to the central through hole (121). Wedge (100) according to the preceding claim, wherein the core (10) has a plurality of channels (14) extending from the central through hole (121) to the plurality of lateral through holes (122). Wedge (100) according to any one of the preceding claims, in which the core (10) has at least one recess (13) on said first face (11) so that the at least one magnet (20) is embedded in the recess (13), and preferably in which the at least one magnet (20) is fully integrated in the recess (13). Method of manufacturing a shim (100) according to any one of the preceding claims, comprising the following steps: at. Attachment of the at least one magnet (20) to the core (10); b. Positioning of the core (10) in a mold (40) comprising an injection channel (41); vs. Injection molding of the elastomeric material (30), which envelops the core (10) and the at least one magnet (20) in their entirety. Method of manufacturing a shim (100) according to the preceding claim, configured with a shim according to claim 9, in which the elastomeric material (30) is injected into a passage formed by the injection channel (41) of the mold (40) and the through hole (12) of the core (10), the through hole (12) being located opposite the injection channel (41). Use of the wedge (100) according to any one of claims 1 to 11 by magnetic attraction on a lift (300) for vehicle maintenance activity. Set of shims according to any one of Claims 1 to 11, comprising a first shim and a second shim, and in which at least one magnet (20) of the first shim has a magnetic polarity reversed from that of at least one magnet (20) of the second wedge so that the first wedge and the second wedge stack by magnetic attraction.

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