FR3057210A1 - DEVICE FOR DISASSEMBLING AND REASSEMBLING A TIRE IN A RIM - Google Patents

Abstract

The invention relates to a disassembly device, respectively reassembly device, a tire in a rim, characterized in that it comprises: - a gear reduction mechanism comprising a ring gear (11) adapted to be secured in rotation to the rim, and at least one toothed pinion (15) cooperating with said ring gear (11) - a rotational actuating device adapted to be centered in the axis of the ring gear (11), comprising an actuating pin (16) integral with the toothed pinion (15) and an arm (12) extending in a radial direction and comprising at its end a disassembly head (13) intended to be inserted between the tire and the rim, so that a load of rotation of the actuating pin (16) causes orbital displacement of the pinion (15) around the ring gear (11) and displacement of the disassembly head (13) at the periphery of the rim so as to exert an extraction force , respectively sertion, the tire bead vis-à-vis the rim.

Description

FIELD OF THE INVENTION

The present invention relates to a device for dismantling and reassembling a tire in a rim.

STATE OF THE ART

The manual pneumatic tools currently offered on the market have various drawbacks, particularly in terms of safety. The use of a standard S-shaped lever type pneumatic tire changer of medium quality can damage the tire sealing lip when it is inserted into the rim and suddenly cause a more or less slow puncture with its consequences. The insertion operation of the last bead of the tire also presents a risk for the user when the counter-force exerted by the elasticity of the tire on the engaged tire levers is at its maximum. The intensity of the effort to be exerted to dismantle the tires with the manual tools offered on the current market is an important parameter which tends to slow down the users to make their own change of tires.

More recent manual equipment offers a rotary disassembly process with a handle ending in a disassembly spatula to rotate around a vertical stem on which the wheel is placed. In addition to the robustness of the ground attachments that must be provided for the mast, the risk of the operator falling is omnipresent by breaking the holding of the spatula in the pneumatic-rim gap. This type of process calls for a suitable working environment. The direction of the force of hand tools requires maintaining the wheel so that it does not rotate or rotate according to the force imposed. It is necessary either to be in pairs, or to have a tool to clamp the wheel in order to be in good position to perform the maneuver alone.

In the case of anodized aluminum rim it is common to insert a protective interface between the tool and the rim so as not to damage the latter during disassembly. The use of this plastic lining poses a problem during the insertion of the tire because it tends to slide inside the tire by its friction with the bead of the tire.

STATEMENT OF THE INVENTION

An object of the invention is to design a lightweight device for dismantling and reassembling a tire in a rim which can be actuated safely by a single operator and without anchoring in the ground. Preferably, said device must adapt to different models of rims and tires, whether they are wheels for cars or motorcycles, or even heavy vehicles (trucks, agricultural machinery, etc.).

In accordance with the invention, a device is proposed for dismantling, respectively reassembling, a tire in a rim, characterized in that it comprises:

- A reduction mechanism comprising a toothed crown capable of being secured in rotation to the rim, and at least one toothed pinion cooperating with said toothed crown.

- a mobile actuation device in rotation adapted to be centered in the axis of the crown, comprising an actuating element of the toothed pinion and an arm extending in a radial direction and comprising at its end a disassembly head intended to be inserted between the tire and the rim, so that a stress on the actuating element generates an orbital movement of the pinion around the crown and a movement of the dismantling head at the periphery of the rim so as to exert an effort of extraction, respectively insertion, of the tire bead with respect to the rim.

According to an embodiment adapted to automobile or motorcycle wheels, the disassembly / reassembly device further comprises a device for centering the rim on a shaft, in which the centering device comprises a primary shaft from which a coaxially extends a threaded rod, a secondary shaft capable of being made integral with the primary shaft by screwing on said threaded rod, and a conical support slidably mounted on the primary shaft against the stress of an elastic element.

According to an embodiment suitable for automobile or motorcycle wheels, the cooperation of the toothed pinion and the toothed crown can be carried out by direct gear or by means of a chain or a belt.

According to an embodiment adapted to automobile or motorcycle wheels, the device further comprises a riser adapted to be interposed between the crown and the rim.

According to an embodiment suitable for automobile or motorcycle wheels, the ring gear is secured to a plurality of anchors suitable for straps suitable for fixing the ring gear to the rim.

Advantageously, the crown is adapted to be fixed to the rim by strapping, slinging, angular blocking lug, fixed sliding or pivoting, pegging, screwing, bolting, crimping, welding and / or being shaped during the production of the rim.

Advantageously, the position of the disassembly head is adjustable by rotation and by sliding of the arm along a guide element inclined relative to the axis of the rim.

Advantageously, the arm comprises two asymmetrical segments forming between them an obtuse angle.

Advantageously, the device further comprises a stop adapted to block the actuation device in translation along the axis of the wheel.

Depending on the implementation range, the device can be available in a manual or motorized version with electric, pneumatic and / or hydraulic power.

BRIEF DESCRIPTION OF THE FIGURES

Other characteristics and advantages of the invention will emerge from the detailed description which follows, with reference to the attached drawings in which:

- Figure 1 is an exploded perspective view of an embodiment of the wheel centering device;

Figure 2 is a sectional view of an embodiment of the centering device on which is mounted an automobile wheel;

Figure 3 is a sectional view of an embodiment of the centering device on which is mounted a motorcycle wheel;

- Figure 4 is an exploded perspective view of an embodiment of the manual control reduction mechanism;

- Figure 5 is a top perspective view of an embodiment of the reduction mechanism and example of manual control tools;

- Figure 6 is a bottom perspective view of an embodiment of the manual control reduction mechanism;

- Figure 7 is a top perspective view of an embodiment of the manual control disassembly device during the disassembly of a car wheel;

- Figure 8 is a perspective bottom view of an embodiment of the manual control disassembly device during the disassembly of a car wheel;

- Figure 9 is a perspective view from above of an embodiment of the disassembly device with manual control during disassembly of a motorcycle wheel;

- Figure 10 is a bottom view in perspective of an embodiment of the device for manual disassembly during disassembly of a motorcycle wheel;

- Figure 11 is a top perspective view of an embodiment of the reduction mechanism in motorized version;

- Figure 12 is a bottom perspective view of an embodiment of the reduction mechanism in a motorized version, equipped with examples of angular locking tabs;

FIG. 13 is a bottom view in perspective of an embodiment of the reduction mechanism in a motorized version, equipped with examples of slings for securing to the rim;

Figure 14 is an overall perspective view of an embodiment of the device associated with a bracket;

FIG. 15 is a diagram illustrating the force resulting from the disassembly head as a function of the torque applied by the operator and the diameter of the wheel in the manual version;

Figure 16 is an overall perspective view of an embodiment of the device with the crown fixed to the outer web of the rim suitable for heavy vehicle wheels;

FIG. 17 is an overall perspective view of an embodiment of the device with the crown fixed to the hub of the rim adapted to the wheels of heavy vehicles;

The components designated by the same reference sign from one figure to another are Identical or at least fulfill the same function.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

The device according to the invention makes it possible to solve the problems associated with the arduousness of the manual disassembly and mounting operation of the tires as well as that of user safety.

In fact, designed using a plasticized dismantling head which has at least soft inserts with a low coefficient of friction in the rim tire contact areas or else made entirely of plastic, makes the device non-binding for the tire lip and moreover for the rim, the coating of which can be sensitive to friction constraints, especially when it is made of aluminum.

From a user point of view, the device is designed so that the effort to dismantle the tire does not generate any external force on the wheel requiring adequate locking of the latter. The user thus has a light and transportable hand tool that does not need any specific fixing to the ground. This ergonomic advantage allows, among other things in the case of the truck version, to intervene on the tire without having to completely remove the wheel from the vehicle.

The device includes a multiplier mechanism which the user actuates externally using a manual tool of the crank type or power tool. Inside the device, the rotation as well as the reduction of the force acting on the dismantling head is achieved by the use of a pinion and toothed crown transmission. This mechanism prevents any reversibility of force due to the elasticity of the tire, which could injure the user.

The device according to the invention is composed of two or even three main assemblies.

The first assembly has the function of centralizer adaptable to the different geometries of automobile wheel hubs as well as of motorcycles allows the second assembly of the device to be centered. Such a set is not used for a heavy vehicle wheel.

The second set includes the ring gear which the operator directly locks in rotation on the rim using straps integrated into the device or by any other means.

Finally, the third integral assembly and rotating on the same axis as the second assembly drives the disassembly head by the rotation of the toothed pinion orbiting at the periphery of the preceding toothed crown. The versatility of the system for different tire sizes is ensured by adjusting the disassembly head in position via a reversible and sliding pivoting arm.

Figure 1 is an exploded perspective view of the centering assembly of the device.

The centering function with respect to the wheel is obtained by means of a mechanically welded fitting 1 comprising a primary shaft 2, from which a threaded rod 6 emerges making it possible to screw a secondary shaft 3. Of course, any other means of securing trees 2 and 3 could be used without departing from the scope of the present invention. The mechanically welded cone 4 can slide along the joinable shafts 2 and 3 against the stress of an elastic element, such as a thrust spring 5 for example.

Figure 2 is a sectional view of the mounting of the centering device in the case of a car wheel.

The secondary shaft 3 is screwed completely onto the threaded rod 6 so as to form only one axis with the primary shaft 2. The cone 4 pushed by the spring 5 makes it possible to center the rim 100 relative to the device.

Figure 3 is a sectional view of the mounting of the centering device in the case of a motorcycle wheel. The threaded rod 6 crosses the axis of rotation of the rim 100 and makes it possible to fix the shaft 3 in its center.

Figure 4 is an exploded perspective view of the rotating gear reduction assembly of the device.

The lower part composed of a toothed crown 11 as well as a tube 8 extending in the center of the crown comprises a multitude of lashings at the lower periphery of the crown 11 where several straps 10 are stowed. plastic for example is intended to protect the coating of the rim as well as to provide sufficient space between the toothed crown 11 and the rim to tighten the loops of the straps 10. A pinion 15 meshes with the crown 11 and makes it possible to rotating the mechanically welded assembly 17. A head 13 for removing the tire, which is known in itself, is fixed to the end of an arm 12 by means of an axis 14. The arm 12 allows the head 13 for dismounting the tire to be adjusted in position by sliding between the flanges 170 of the welded component 17 while being guided along the oblong grooves 171 formed in the flanges 170.

FIG. 5 is a perspective view from above of the reduction gear assembly making it possible to visualize this assembly ready to be placed on the wheel as well as two examples of manual actuation tools: a cross key 200 and a power screwdriver 202.

FIG. 6 is a bottom perspective view of the reduction gear assembly making it possible to view the transmission crown 11 and pinion 15 in the operating state (the wheel not being shown).

Figure 7 is a top perspective view of the device in the case of disassembly of a car wheel. This view makes it possible to understand the usefulness of the adaptable straps with the majority of the designs of rims 100 as well as the principle of maneuver which the user of the device must carry out. We can also note the option of the stop 7 which, screwed to the top of the secondary shaft 3, allows the need to keep the complete assembly locked in translation in the axis of the wheel.

Figure 8 is a bottom perspective view of the device in the case of disassembly of a car wheel. It allows you to view the usefulness of the centering assembly provided with its centering cone 4 and the thrust spring 5.

Figure 9 is a top perspective view of the device in the case of disassembly of a motorcycle wheel. It also makes it possible to view a different adjustment position of the dismantling head 13 relative to FIG. 7 by turning the arm 12.

Figure 10 is a bottom perspective view of the device in the event of disassembly of a motorcycle wheel. It can be noted that the centering cone 4 components as well as the spring 5 and stop 7 are not useful in this case of use.

FIG. 11 is a perspective view of the multiplying mechanism in a motorized version making it possible to view the integration of a motor, for example an electric motor 203 actuating the pinion 15 directly or indirectly.

Figure 12 is a perspective view of the reduction mechanism provided with two examples of angular locking lugs 50 or 51 and 52. The rigid lug 50 is movable in rotation relative to its axis of attachment to the crown and thus allows to offer a wider range of positioning points in the rim. The support 51 fixed relative to the crown 11 allows the tab 52 to slide radially to the rim in order to find an orifice therein. These tabs can be coated with a flexible element such as for example polyurethane so as not to damage the rim.

FIG. 13 is a perspective view from below of the reduction mechanism making it possible to view an example of securing the device to the rim by slings. An example of anchorages 30 integral with the crown 11 makes it possible to secure several examples of textile slings 31 or ideally plasticized steel cables 32 as well as all forms of lanyards not shown in rope or plastic fitted or not with snap hooks. The common function being to fix the reduction mechanism to the rim in order to block it in rotation.

FIG. 14 is a perspective view of a preferred embodiment with the device at the top of a mechanically-dismountable stem at a good height equipped with a setting and a tire calibrating lever. A mechanically welded fork 90 intended to be wedged under a vehicle wheel or loaded with weight, keeps the foot opposite the lever in order to counter the stress relief effort.

The diagram in FIG. 15 represents for the device according to FIGS. 4 to 10 the effort resulting from the dismantling head (expressed in daN) as a function of the torque applied by the user represented by slice of 1 to 10 daN / m in depending on the diameter of the wheel (expressed in inches). The torque transferred by the operator to the dismantling head can be multiplied by 16 to 27 times.

FIG. 16 is a view of a variant of integration of the device with the crown 11 directly fixed to the outer web of the rim 100 in the case of a heavy vehicle wheel whose technical offset (ET) is sufficiently low offering the possibility of fixing the crown to it, for example by welding.

FIG. 17 is a view of a variant integration of the device with the crown fixed to the hub of the rim in the case of a heavy vehicle wheel whose technical offset (ET) is strongly positive and does not offer the possibility of fixing the crown on the external veil.

From an operating point of view in the case of the use of the device for dismantling a car wheel, as shown in FIGS. 2, 7 and 8, fitted with its tire previously uncoupled from the seats of the rim, the user begins by inserting the secondary shaft 3 of the centering device on the inside and in the central hole of the wheel. It then comes to insert the rotary reduction gear assembly of the device on the shaft 3 exiting from the front face of the rim and then locks the assembly in translation if necessary using the stop 7.

The user then arranges the straps on a case-by-case basis, either between the sticks or in the holes in the rim, then tightens them using the loops, which makes it possible to block the fixed part comprising the crown 11 in rotation. position of the disassembly head 13 against the rim flange using the various adjustments available through the intermediate arm

12.

Using a conventional tire lever ideally sheathed by a flexible material, the user positions the bead of the tire on the appropriate boss of the dismantling head 13 then holds the other end of the tire changer under a strap the closer to have both hands to execute the rotation maneuver. This manipulation also creates the fixed angular stop of the tire so that it does not reinsert into the rim during the disassembly maneuver. It will be noted that the multitude of straps distributed also makes it possible to multiply the possibilities of retaining the pneumatic lever.

The user then inserts a screwing tool of his convenience into an actuating pin 16 (for example, in the example illustrated, a hexagonal head) integral with the toothed pinion 15 and by rotation of the latter it constrains the movable assembly to rotate around the crown 11. The reduction in the force acting on the dismantling head is closely linked to the ratio of teeth between the crown and the pinion. The larger the gap, the easier it will be for the user to disassemble a wheel. Once the first sidewall of the tire has been dismantled, the operator can then engage the second bead of the tire in the same way on the boss of the dismantling head and thus remove it completely. In the opposite case of fitting a tire, the device is fixed and adjusted on the bare rim in order to retract the sidewalls of the tire one by one by actuating the device in the same way as for the dismantling phases.

From an operational point of view in the case of use of the device for dismantling a motorcycle wheel as shown in FIGS. 3, 9 and 10 equipped with its tire previously uncoupled from the rim seats, the user first begins by unscrewing the secondary shaft 3 from the threaded rod 6 in order to insert the latter through the central hole in the rim on the side which it considers most suitable depending on the presence or absence of brake discs. The user then re-screws the secondary shaft 3 over the outgoing length of the threaded rod 6, centering it as well as possible in the axis of the hub and can then reproduce the same tasks as in the case of a car wheel detailed above.

In a preferred embodiment, the dismantling of the secondary shaft 3 connected by a long threaded rod 6 at the end of the primary shaft 2 allows the versatility of the centering device with the small diameters of hub axes of the wheels of motorcycles up to the largest diameter of automobile hubs assisted by the centering cone 4 pushed by the spring 5.

In a preferred embodiment, the use of straps 10 provided with adjustment loops for securing the device to the rims allows the greatest flexibility of adaptation with the different cases of structures (rims with sticks, rims with sheet metal with holes, rims department). The presence of several anchors arranged equidistantly at the lower periphery of the crown 11 makes it possible to secure several combinations of straps simultaneously. This option of flexible multi-stowage also allows to generate a winding principle which tends to keep the system pressed against the rim in proportion to the force. The use of multiple adjustable straps 10 is particularly suitable for spoke rims because of a better distribution of the force over all the spokes and therefore the minimization of the risk of warping thereof. The principle of one or more completely rigid anti-rotation tabs is preferred in the context of an embodiment of the device strictly dedicated to a rim design. These securing systems of the device are not limiting and can just as easily be made by screwing, bolting, gluing, crimping or welding, which is more suitable for heavy vehicles. One can also imagine the toothed crown coming directly from the molding of the aluminum rim. The common goal is to block the ring gear in rotation relative to the rim.

In the preferred embodiment, the drive of the pinion 15 on the crown 11 can be either by direct gear in order to minimize the number of components and therefore the cost of production, or by a chain or belt transmission allowing for its flexibility. a greater latitude of misalignment and distance between centers.

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In the preferred embodiment, the intermediate arm 12 involved in adjusting the dismantling head 13 is made in two segments forming an obtuse angle and each having a respective fixing hole at a different distance from the center of the arm. This design of the intermediate arm 12 allows, by turning, to access a second range of adjustment and therefore of wheel size.

In the preferred embodiment, the intermediate arm 12 is guided by the body 17 between two parallel flanges 170 provided with oblong grooves 171 in which it can slide and be immobilized by means of a through bolt.

In the preferred embodiment for the manual version, the drive in rotation of the pinion 15 is carried out by means of an actuating pin in the form of a hexagonal head 16, thus offering the possibility of using all standard tools such as, for example, crank, cross key 200, extension key, but also impact wrench, electric screwdriver 202, etc.

In the preferred, functional and eco-design embodiment, steel is the main material preferred for making the device. The mechanically welded assembly allows it to be robust while being light with components from simple sheet metal cutting, some of which can be stamped as part of industrialization. An economical anticorrosion coating, for example in the family of electrogalvanizing or epoxy paints, provides long-term protection of the device.

In the preferred, functional and eco-design embodiment, the central tube of the mobile component 17 rotates directly using a slight clearance around the tube 8. Holes present on the body 17 communicate with the rotating elements (tube 8 and pinion axis 15), to ensure periodic lubrication or as needed.

In a higher-end embodiment, certain components 17, 12, 11, 15 can be obtained from a non-ferrous alloy molding process, for example: Alpax ™, aluminum, magnesium or even plastic ... and include self-lubricating guide elements or bearings thus significantly reducing the friction of rotation.

In another embodiment more integrated with the rim in the case of heavy vehicles, the crown can be separated from the device described above to be fixed either permanently on the rim by welding or any other hard means previously mentioned. The rotating part designed differently then comes to center directly on the crown by means of three pinions by which the action of rotation of only one makes it possible to actuate the dismantling head. This robust variant of the device is more suitable for heavy vehicles of the agricultural or construction site type but also for the army in the context of efficient and autonomous troubleshooting, for example by removing only the first tire blank in order to repair it. from the inside with the advantage of not having to dismantle the vehicle wheel.

From an industrial point of view, this device is specifically designed for the disassembly and reassembly of tires. The transportability of the device as well as the exemption from an external energy network will be of particular interest to fans of motor sports on the competition field. It is a particularly suitable tool for troubleshooting.

Claims (10)

1. Device for dismantling, respectively reassembling, a tire in a rim, characterized in that it comprises: - a reduction mechanism comprising a toothed crown (11) capable of being secured in rotation to the rim (100), and at least one toothed pinion (15) cooperating with said toothed crown (11) - An actuation device movable in rotation adapted to be centered in the axis of the crown (11), further comprising an actuating element (16, 203) of the toothed pinion (15) and an arm (12) s' extending in a radial direction and comprising at its end a disassembly head (13) intended to be inserted between the tire and the rim, so that a stress on the actuating element (16, 203) generates an orbital displacement of the pinion (15) around the crown (11) and a displacement of the dismantling head (13) on the periphery of the rim so as to exert an extraction force, respectively insertion, from the tire bead opposite - screw the rim. 2. Device according to claim 1, further comprising a device for centering the rim on a shaft (2, 3), in which the centering device comprises a primary shaft (2) from which a threaded rod (6) coaxially extends , a secondary shaft (3) capable of being made integral with the primary shaft (2) by screwing on said threaded rod (6), and a conical support (4) slidably mounted on the primary shaft (2) to the 'against the stress of an elastic element (5). 3 Device according to claim 1 or claim 2, wherein the crown is adapted to be fixed on the rim by strapping (10), slinging (31) (32), angular locking tab (50) (51) (52) , pinning, gluing, crimping, welding, screwing, bolting and / or forming part of the rim molding. 4 Device according to one of claims 1 to 3, wherein the cooperation of the toothed pinion (15) and the toothed ring (11) is achieved by direct gear or by means of a chain or a belt. 5 Device according to one of claims 1 to 4, wherein the position of the disassembly head (13) is adjustable by rotation and by sliding the arm (12) along a guide member (171) inclined relative to to the rim axis. 6 Device according to one of claims 1 to 5 wherein the arm (12) comprises two asymmetrical segments forming between them an obtuse angle. 5 7 Device according to one of claims 1 to 6 further comprising an extension (9) adapted to be interposed between the crown and the rim. 8 Device according to one of claims 1 to 7 wherein the ring gear (11) is integral with a plurality of anchors adapted for straps adapted to fix the 10 ring gear (11) on the rim. 9 Device according to one of claims 1 to 8 further comprising a stop (7) adapted to block the actuation device in translation along the axis of the wheel. 10 Device according to one of claims 1 to 9, characterized in that it further comprises either a pin (16) for manual actuation, or an electric, pneumatic or hydraulic motor (203), integral with the pinion (15 ) to generate the orbital movement of the pinion (15) around the crown (11). 1/17