Rotatable position-changing tire changing hook

Abstract

The utility model discloses a kind of tire changing hooks of rotatable variable position, including tire changing hook, dismounting head and mounting seat. One guide channel is equipped in mounting seat, the guide channel includes the first working cavity with cylindrical inner wall, allow dismounting head to move along axial direction and rotate freely around its own axis. Dismounting head is equipped with limit boss, and limit slot of the opening end of guide channel is adapted. Tire changing hook is fixedly connected to one end of dismounting head. When dismounting head is located in the axial high position of guide channel, limit boss is embedded in limit slot, and the circumferential rotation of dismounting head and tire changing hook is limited;And when dismounting head is pushed to low position, limit boss is separated from limit slot, so that dismounting head and tire changing hook can rotate freely, realize angle adjustment. The utility model realizes the stable locking and flexible variable position of tire changing hook under different working conditions by simple mechanical structure, improves the convenience and efficiency of tire changing operation, especially suitable for professional tire maintenance occasion needing to adjust angle quickly.

Description

Technical Field

[0001] This utility model relates to the field of tire disassembly and assembly technology, and in particular to a rotatable tire disassembly hook. Background Technology

[0002] Existing tire changers generally use pneumatic drive to adjust the rotation of the tire hook, which typically includes a complex transmission mechanism such as a cylinder, rotary joint, precision bearings, seals, and gears or worm gears. While this solution can meet the angle adjustment requirements, it demands extremely high machining precision, especially in the rotating shaft, bearing mating surfaces, and air circuit seals, where micron-level tolerances are required. This results in complex manufacturing processes, low yield rates, and high costs. Furthermore, many precision components and pneumatic circuits are prone to leaks, jamming, wear, or positioning failures in the dusty, oily, and vibrating environment common in tire repair shops, resulting in poor reliability. Once a malfunction occurs, ordinary operators cannot handle it themselves and it must be repaired or debugged by professionals, which not only prolongs downtime but also significantly increases operation and maintenance costs, affecting operational efficiency and flexibility. Summary of the Invention

[0003] This invention provides a rotatable tire changer hook to overcome the technical problems of existing pneumatically driven tire changer hook rotation mechanisms, such as complex structure, high manufacturing cost, difficult maintenance, reliance on professional personnel, and lack of convenient manual operation functions.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A rotatable tire-removing hook includes a tire-removing hook, a tire-removing head, and a mounting base; The mounting base is provided with a guide channel, which includes a first working cavity with a cylindrical inner wall, so as to allow the disassembly head to move along its axial direction and rotate freely around its own axis when it is out of the limited position. The disassembly head is provided with a limiting boss, and the opening end of the guide channel is provided with a limiting groove that matches the limiting boss. The tire removal hook is connected to one end of the tire removal head; When the disassembly head is located at the axial high position of the guide channel, the limiting boss is embedded in the limiting groove, restricting the circumferential rotation of the disassembly head and the tire removal hook; When the disassembly head is pushed to the axial low position of the guide channel, the limiting boss disengages from the limiting groove, allowing the disassembly head and the tire removal hook to rotate around their axis and achieve displacement.

[0005] Furthermore, the guide channel also includes a second working cavity and a third working cavity; the inner diameters of the first working cavity, the second working cavity and the third working cavity decrease sequentially, and the inner diameter of the first working cavity is larger than the outer circle diameter of the limiting boss, so that the limiting boss can rotate around its axis within the first working cavity.

[0006] Furthermore, the disassembly / assembly head is a one-piece molded structure, including a first working end and a second working end.

[0007] Furthermore, both the first working end and the second working end are concentrically arranged cylinders; the diameter of the first working end is larger than the diameter of the second working end; the outer diameter of the second working end matches the inner diameter of the third working cavity, so that it fits with the inner wall of the third working cavity in the radial direction and can slide along the axial direction.

[0008] Furthermore, a smooth annular groove is machined at the transition point between the second working end and the first working end; a stop ring is embedded in the annular groove; the stop ring has a stepped structure, including a first diameter segment and a second diameter segment integrally formed along the axial direction; the outer diameter of the first diameter segment matches the inner diameter of the first working cavity and can slide axially along its inner wall; the outer diameter of the second diameter segment matches the inner diameter of the second working cavity and can slide axially along its inner wall. The inner diameter of the stop ring matches the outer diameter of the annular groove at the second working end, so that the stop ring is fitted onto the disassembly head and allows the disassembly head to rotate freely in the circumferential direction relative to the stop ring.

[0009] Furthermore, the limiting boss is a hexagonal prism structure and is integrally formed with the disassembly head; the opening end of the guide channel is provided with a hexagonal limiting groove that matches the limiting boss; the inner wall of the guide channel forms a first limiting step structure at the transition between the opening end and the first working cavity; when the disassembly head moves axially to a high position, one end face of the first diameter segment of the stop ring abuts against the first limiting step structure to achieve axial high-position limiting.

[0010] Furthermore, a second limiting step structure is formed on the inner wall of the guide channel at the transition between the first working cavity and the second working cavity; when the disassembly head moves axially to a low position, the other end face of the first diameter segment of the stop ring abuts against the second limiting step structure to achieve axial low position limiting.

[0011] Furthermore, a spring is provided in the second working chamber, with the lower end of the spring abutting against the bottom of the second working chamber and the upper end abutting against the lower end face of the stop ring; when the disassembly head is pushed to the low position, the spring is compressed; and after the external force is released, it pushes the stop ring and the disassembly head to reset upwards, so as to automatically return to the axial high position.

[0012] Beneficial Effects: This utility model provides a rotatable tire-removing hook that uses a purely mechanical structure to replace the traditional pneumatic rotating mechanism. This structure requires no air source, no seals, and no complex transmission components, resulting in low manufacturing costs, strong resistance to contamination, simple operation, and convenient maintenance. Ordinary personnel can perform daily use and maintenance, effectively overcoming the shortcomings of traditional pneumatic rotating mechanisms such as high precision requirements, susceptibility to failure, difficulty in repair, and slow response, significantly improving the efficiency and reliability of tire-removing operations. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the device; Figure 2 This is a structural diagram of the disassembly / assembly head; Figure 3 This is a schematic diagram of the limiting groove structure; In the diagram: 1: Tire removal hook; 2: Tire removal head; 3: Mounting base; 21: First working end; 22: Second working end; 23: Limiting boss; 24: Stop ring; 241: First diameter section; 242: Second diameter section; 31: First working cavity; 32: Second working cavity; 33: Third working cavity; 34: Limiting groove. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] This embodiment provides a rotatable tire-removing hook, such as... Figure 1 A rotatable tire removal hook, comprising a tire removal hook 1, a tire removal head 2, and a mounting base 3; The mounting base 3 is provided with a guide channel, which includes a first working cavity 31 with a cylindrical inner wall, so as to allow the disassembly head 2 to move along its axial direction and rotate freely around its own axis. The disassembly head 2 is provided with a limiting boss 23, and the opening end of the guide channel is provided with a limiting groove 34 that is adapted to the limiting boss 23. The tire removal hook 1 is connected to one end of the tire removal head 2; When the disassembly head 2 is located at the axial high position of the guide channel, the limiting boss 23 is embedded in the limiting groove 34, restricting the circumferential rotation of the disassembly head 2 and the tire removal hook 1; When the disassembly head 2 is pushed to the axial low position of the guide channel, the limiting boss 23 disengages from the limiting groove 34, allowing the disassembly head 2 and the tire removal hook 1 to rotate around their axis and achieve displacement.

[0017] Specifically, in the initial state, the disassembly / removal head 2 is located at the axial high position of the guide channel within the mounting base 3. At this time, the limiting boss 23 on the disassembly / removal head 2 is embedded in the limiting groove 34 at the opening end of the guide channel. Since the limiting boss 23 and the limiting groove 34 cooperate with each other in the circumferential direction, the rotation of the disassembly / removal head 2 around its axis is restricted, thereby keeping the tire removal hook 1 connected to it in a fixed position and preventing it from rotating, which is suitable for tire removal operations that require stable force application.

[0018] When it is necessary to change the angular position of the tire removal hook 1, the removal head 2 is pushed axially, causing it to move towards the axially lower position of the guide channel. As the removal head 2 descends, the limiting boss 23 gradually disengages from the limiting groove 34. Once completely disengaged, the limiting boss 23 is no longer circumferentially constrained by the limiting groove 34, and since the guide channel is a cylindrical surface, it does not impose circumferential restrictions on the removal head 2. Therefore, the removal head 2 can rotate freely around its own axis. Since the tire removal hook 1 is connected to one end of the removal head 2, the two rotate synchronously, thereby realizing the rotational displacement of the tire removal hook 1.

[0019] Furthermore, by dividing the guide channel into a first working cavity 31, a second working cavity 32, and a third working cavity 33 with successively decreasing inner diameters, and setting a sufficiently large inner diameter (greater than the outer circle diameter of the limiting boss 23) in the first working cavity 31, the limiting boss 23 can rotate freely inside it after disengaging from the limiting groove 34, thereby ensuring smooth and interference-free rotational displacement of the disassembly head 2 and the connected tire removal hook 1; at the same time, the multi-stage stepped cavity structure provides a clear axial high and low position positioning reference for the disassembly head 2, taking into account both rotational freedom and circumferential locking reliability, and improving operational flexibility and usage stability.

[0020] Furthermore, the disassembly / removal head 2 adopts an integrally formed concentric double-cylinder structure. The diameter of the first working end 21 is larger than the diameter of the second working end 22. The diameter of the second working end 22 matches the inner diameter of the third working cavity 33, allowing it to cooperate radially with the inner wall of the third working cavity 33 and slide axially. Combined with the smooth annular groove at the transition between the second working end 22 and the first working end 21, and the stop ring 24 embedded therein, a balance between compact structure and reliable movement is achieved. The inner hole of the stop ring 24 is divided into a first diameter segment 241 and a second diameter segment 242, matching the inner diameters of the first working cavity 31 and the second working cavity 32. This allows it to slide smoothly axially within the guide channel and achieve precise axial positioning through cooperation with different working cavities. Simultaneously, the stop ring 24 and the disassembly / removal head 2 are not fixedly connected in the circumferential direction, ensuring unobstructed rotation of the disassembly / removal head. This effectively supports the rotational displacement function of the tire hook while ensuring axial positioning accuracy, improving the overall operational stability, durability, and ease of use.

[0021] Furthermore, such as Figure 2 and Figure 3 The limiting boss 23 adopts a hexagonal prism structure and is integrally formed with the disassembly head 2. The limiting groove 34 is an internal hexagonal through hole structure located at the opening end of the guide channel. Its hexagonal inner contour and the hexagonal limiting boss 23 on the disassembly head 2 form a shape-fitting pair to achieve circumferential locking in the axial high position state. Multiple cylindrical guide holes are provided around the groove to assist in positioning and assembly. At the same time, the first limiting step structure set at the transition between the opening end of the guide channel inner wall and the first working cavity 31 mates with the end face of the first diameter section 241 of the stop ring 24 to form a clear and reliable axial high position positioning reference. This design organically combines circumferential locking and axial limiting functions, with a compact structure and precise positioning. It not only prevents the disassembly head from accidentally coming off, but also ensures the secure locking of the rotary displacement mechanism in the high position state.

[0022] Furthermore, by setting a second limiting step structure at the transition between the first working cavity 31 and the second working cavity 32 on the inner wall of the guide channel, and cooperating with the other end face of the first diameter section 241 of the stop ring 24, precise and stable axial limiting can be achieved when the disassembly head 2 moves axially to the low position. This limiting method effectively prevents the disassembly head from descending excessively or shaking, ensuring its positional reliability in the low-position displacement state; at the same time, combined with the high-position limiting structure, a bidirectional axial positioning is formed, so that the disassembly head has a clear mechanical stop in both the high and low working positions, which not only ensures the smoothness of the rotation displacement operation, but also improves the stability and durability of the overall structure, which is conducive to improving the efficiency and safety of tire removal operations.

[0023] Furthermore, a spring is provided inside the second working chamber 32. The lower end of the spring abuts against the bottom of the second working chamber 32, and the upper end abuts against the lower end face of the stop ring 24. When the disassembly head 2 is pushed to the low position, the spring is compressed. After the external force is released, it pushes the stop ring 24 and the disassembly head 2 to reset upwards, so that the limiting boss 23 re-embeds into the limiting groove 34, restoring the axial high-position locking state. This design realizes automatic reset and circumferential locking after the tire hook is rotated and displaced, significantly improving the ease of operation.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rotatable tire-removing hook, characterized in that: Includes tire removal hook (1), tire removal head (2), and mounting base (3); The mounting base (3) is provided with a guide channel, which includes a first working cavity (31) with a cylindrical inner wall, so as to allow the disassembly head (2) to move along its axial direction and rotate freely around its own axis when it is out of the limited position. The disassembly head (2) is provided with a limiting boss (23), and the opening end of the guide channel is provided with a limiting groove (34) that is compatible with the limiting boss (23). The tire removal hook (1) is connected to one end of the tire removal head (2); When the disassembly head (2) is located at the axial high position of the guide channel, the limiting boss (23) is embedded in the limiting groove (34) to restrict the circumferential rotation of the disassembly head (2) and the tire removal hook (1); When the disassembly head (2) is pushed to the axial low position of the guide channel, the limiting boss (23) disengages from the limiting groove (34), allowing the disassembly head (2) and the tire removal hook (1) to rotate around their axis and achieve displacement.

2. The rotatable tire-removing hook according to claim 1, characterized in that: The guide channel further includes a second working cavity (32) and a third working cavity (33); the inner diameters of the first working cavity (31), the second working cavity (32) and the third working cavity (33) decrease sequentially, and the inner diameter of the first working cavity (31) is larger than the outer circle diameter of the limiting boss (23), so that the limiting boss (23) can rotate around its axis in the first working cavity (31).

3. The rotatable tire-removing hook according to claim 2, characterized in that: The disassembly / assembly head (2) is an integrally formed structure, including a first working end (21) and a second working end (22).

4. The rotatable tire-removing hook according to claim 3, characterized in that: The first working end (21) and the second working end (22) are both concentrically arranged cylinders; the diameter of the first working end (21) is larger than the diameter of the second working end (22); the outer diameter of the second working end (22) matches the inner diameter of the third working cavity (33), so that it fits the inner wall of the third working cavity (33) in the radial direction and can slide along the axial direction.

5. A rotatable tire-removing hook according to claim 4, characterized in that: The transition point between the second working end (22) and the first working end (21) is machined with a smooth annular groove; a stop ring (24) is embedded in the annular groove; the stop ring (24) has a stepped structure, including a first diameter segment (241) and a second diameter segment (242) integrally formed along the axial direction; the outer diameter of the first diameter segment (241) matches the inner diameter of the first working cavity (31) and can slide axially along its inner wall; the outer diameter of the second diameter segment (242) matches the inner diameter of the second working cavity (32) and can slide axially along its inner wall. The inner diameter of the stop ring (24) matches the outer diameter of the annular groove of the second working end (22), so that the stop ring (24) is fitted onto the disassembly head (2) and the disassembly head (2) is allowed to rotate freely in the circumferential direction relative to the stop ring (24).

6. A rotatable tire-removing hook according to claim 5, characterized in that: The limiting boss (23) is a hexagonal prism structure and is integrally formed with the disassembly head (2); the opening end of the guide channel is provided with a hexagonal limiting groove (34) that matches the limiting boss (23); the inner wall of the guide channel forms a first limiting step structure at the transition between the opening end and the first working cavity (31); when the disassembly head (2) moves axially to a high position, one end face of the first diameter section (241) of the stop ring (24) abuts against the first limiting step structure to achieve axial high position limiting.

7. A rotatable tire-removing hook according to claim 5, characterized in that: The inner wall of the guide channel forms a second limiting step structure at the transition between the first working cavity (31) and the second working cavity (32); when the disassembly head (2) moves axially to a low position, the other end face of the first diameter section (241) of the stop ring (24) abuts against the second limiting step structure to achieve axial low position limiting.

8. A rotatable tire-removing hook according to claim 7, characterized in that: A spring is provided in the second working chamber (32). The lower end of the spring abuts against the bottom of the second working chamber (32), and the upper end abuts against the lower end face of the stop ring (24). When the disassembly head (2) is pushed to the low position, the spring is compressed. After the external force is released, the stop ring (24) and the disassembly head (2) are pushed upward to reset automatically to the axial high position.

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