A car repair lifting device with automatic car alignment

Abstract

This invention belongs to the field of automotive repair technology and discloses an automotive repair lifting device with automatic vehicle alignment. It includes a support assembly and a hydraulic support for lifting the support assembly. The support assembly includes a connecting plate and adjusting seats on both sides. It also includes a synchronization assembly mounted on the connecting plate for synchronizing and opposing the movement of the two adjusting seats. The above solution uses the hydraulic support to drive the support assembly upwards. At this time, under the weight of the vehicle, the support grille is pressed downwards. Ultimately, the two sets of wheels are supported by the bottom ends of the second and first support damping roller groups, maintaining their relative positions. This also ensures that the vehicle as a whole remains centered on the support assembly, thus solving the problem of inaccurate support arm positioning and reduced lifting stability caused by the complete reliance on manual operation in two-post lifts.

Description

Technical Field

[0001] This invention belongs to the field of automotive repair technology, specifically an automotive repair lifting device with automatic vehicle alignment. Background Technology

[0002] With the rapid development of the automotive industry and the continuous increase in car ownership, the automotive repair industry is also growing rapidly. During automotive repair, lifting equipment is often needed to raise the car so that repair personnel can inspect and repair its undercarriage. For small repair shops, the two-post lift is one of the most commonly used car lifting devices. It mainly consists of two posts, a lifting platform, and support arms. Operators move the car between the two posts and manually adjust the support arms to below the vehicle's chassis. Then, hydraulic rods are used to push the lifting platform to lift the vehicle. However, this type of two-post lift relies entirely on manual movement of the vehicle and adjustment of the support arms. This not only demands a high level of experience and skill from the operator but is also prone to human error, leading to inaccurate support arm positioning and affecting lifting stability. Furthermore, the two-post lift relies solely on the two posts for support and restraint. Therefore, as the lifting platform continues to lift the vehicle, it is prone to causing the vehicle to sway, potentially leading to tipping over. This increases the risk to operators during vehicle repairs and reduces repair efficiency. Therefore, to solve the above problems, a car maintenance lifting device with automatic car correction is proposed. Summary of the Invention

[0003] To address the problems mentioned in the background art, the present invention provides a car maintenance lifting device with automatic car correction, which solves the problem that the two-post lift relies entirely on manual operation when lifting a car, resulting in inaccurate support arm positions and affecting lifting stability.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a car repair lifting device with automatic car alignment, comprising a support assembly and a hydraulic bracket for lifting the support assembly, the support assembly including a connecting plate and adjusting seats disposed on both sides thereof, and further comprising:

[0005] A synchronization component, mounted on a connecting plate, is used to keep the two adjusting seats synchronized and moving in opposite directions;

[0006] The adjusting seat includes support seats disposed on both sides of the connecting plate. Each of the two support seats is fixedly connected to a limiting plate and an elastic damping limiting rod located inside the connecting plate on one side opposite to the other. The limiting plate is movably connected inside the connecting plate, and the elastic damping limiting rod is elastically connected inside the connecting plate to make the support seat tend to move toward the connecting plate.

[0007] The support base is also movably mounted with a first support damping roller assembly and a second support damping roller assembly, which are inclined toward opposite sides.

[0008] The support base is elastically supported by an elastic bracket, and a support grid is fixedly connected to the top of the elastic bracket. The grid plate portion of the support grid passes upward through the gap between the upper roller shafts of the first and second support damping roller groups. The top of the grid plate portion of the support grid is at the same height plane as the connecting plate and the top of the adjusting seat.

[0009] Preferably, the synchronization component includes a gear movably connected to the support component, and racks movably connected to the connecting plate are meshed above and below the gear; the opposite ends of the two racks are respectively fixedly connected to two support seats.

[0010] Preferably, the two support seats on the same connecting plate have inclined surfaces on opposite sides, and in the initial state, the bottom of both the connecting plate and the support seats are in contact with the ground.

[0011] Preferably, the top of the connecting plate is further provided with a through hole communicating with the piston end of the elastic damping limiting rod; the diameter of the through hole is smaller than the diameter of the cross-section of the piston part of the elastic damping limiting rod.

[0012] Preferably, one of the support bases has a bending block hinged to one end near the connecting plate; the upper surface of the bending block located inside the support base is at the same height as the top surface of the support base.

[0013] The other end of the bending block is located above the connecting plate and is initially tilted. When the bending block is rotated, the end of the bending block located above the connecting plate is screwed into the connecting plate, and the upper surface of the other end of the bending block is tilted towards the connecting plate.

[0014] Preferably, the lifting assembly includes a drive assembly fixedly installed in the middle of the connecting plate and a limiting crossbar fixedly installed on both sides of the connecting plate; a slider movably connected inside the connecting plate and sleeved outside the limiting crossbar; and a connecting rod symmetrically hinged to the end of the slider away from the drive assembly.

[0015] The driving assembly is used to drive the sliders on both sides to move. The top of the connecting rod is hinged to a top plate that is movably connected to the connecting plate. In the initial state, the top surface of the top plate is at the same height as the top surface of the connecting plate.

[0016] Preferably, the connecting plate is also symmetrically hinged with telescopic connecting rods located below the top plate, and the bottom axis of the telescopic connecting rods is a rotation axis; the top of the telescopic connecting rods is hinged to the top plate.

[0017] Preferably, the first connecting rod and the telescopic connecting rod are arranged to cross and be staggered; the connecting plate is also symmetrically and movably connected with rubber blocks, which are movably sleeved on one end of the rotating shaft;

[0018] The rotating shaft is also circumferentially arrayed and has guide grooves. The rubber block has several convex shafts fixed inside and can slide in the guide grooves respectively. The convex shafts are initially located at the end of the guide groove near the telescopic connecting rod.

[0019] The rubber block is arc-shaped at the end near the limiting plate, and can squeeze the limiting plate when it moves toward the limiting plate.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The above solution uses a hydraulic support to drive the support assembly upwards. At this time, under the action of the vehicle's gravity, the support grille is pressed downwards. Simultaneously, the vehicle's tires will contact either the second or the first set of support damping rollers. When one set of tires on the vehicle is on the first set of support damping rollers, the wheel will force the support seat to move away from the connecting plate. Under the action of the synchronization component, the other support seat will move synchronously and in the opposite direction. Since each roller on the second or the first set of support damping rollers will rotate, the two sets of wheels will move along the second or the first set of support damping rollers. Finally, the two sets of wheels are supported by the bottom ends of the second and the first sets of support damping rollers and maintain their relative positions. This also ensures that the vehicle as a whole is always in the center position on the support assembly, thus solving the problem that the two-post lift relies entirely on manual operation when lifting a car, which leads to inaccurate support arm positions and affects lifting stability.

[0022] The above scheme drives two sets of sliders to move in opposite directions by running the drive component, so that the top of the connecting rod lifts the top plate. At this time, the upward movement of the top plate will lift the chassis part between the front and rear wheels of the vehicle, thereby causing the tire part of the vehicle to disengage from the contact of the first support damping roller group, thus making it easier for the operator to repair or replace the vehicle wheel part.

[0023] The above solution drives the slider of the drive component to move the top plate upward, which in turn causes the top of the telescopic link to move upward, thereby causing the telescopic link to rotate and drive the rotating shaft to rotate. This causes the guide groove to force the cam to move, which in turn causes the rubber pressure block to move toward the limiting plate and deform, thereby fixing the limiting plate. This ensures that after the top plate is released from supporting the vehicle, the vehicle tires are still between the first support damping roller group and the second support damping roller group. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2This is a schematic diagram of the structure of the support component of the present invention;

[0026] Figure 3 This is a top horizontal sectional view of the connecting plate of the present invention;

[0027] Figure 4 This is a schematic diagram of the front vertical cross-sectional structure of the elastic support of the present invention;

[0028] Figure 5 This is a schematic diagram of the synchronization component of the present invention;

[0029] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0030] Figure 7 This is a schematic diagram of the lifting assembly.

[0031] Figure 8 This is a partial cross-sectional view of the pressure block of the present invention.

[0032] In the diagram: 1. Support assembly; 11. Connecting plate; 111. Through hole; 12. Adjusting seat; 121. Support seat; 1211. Support damping roller group one; 1212. Bending block; 1213. Support damping roller group two; 122. Limiting plate; 123. Elastic damping limiting rod; 124. Elastic bracket; 1241. Support grid; 2. Synchronization assembly; 21. Rack; 22. Gear; 3. Lifting assembly; 31. Drive assembly; 32. Slider; 33. Connecting rod one; 34. Telescopic connecting rod; 341. Rotating shaft; 3411. Guide groove; 35. Limiting crossbar; 36. Top plate; 4. Rubber pressure block; 41. Convex shaft; 5. Hydraulic bracket. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 8 As shown, the present invention provides a car repair lifting device with automatic car correction, including a support assembly 1 and a hydraulic bracket 5 for lifting the support assembly 1. The support assembly 1 includes a connecting plate 11 and adjusting seats 12 disposed on both sides thereof. It also includes a synchronization assembly 2, which is mounted on the connecting plate 11 for keeping the two adjusting seats 12 synchronized and moving in opposite directions.

[0035] The adjusting seat 12 includes support seats 121 disposed on both sides of the connecting plate 11. Each of the two support seats 121 is fixedly connected to a limiting plate 122 and an elastic damping limiting rod 123 located inside the connecting plate 11 on the opposite side. The limiting plate 122 is movably connected inside the connecting plate 11, and the elastic damping limiting rod 123 is elastically connected inside the connecting plate 11 to make the support seat 121 have a tendency to move toward the connecting plate 11.

[0036] Support damping roller assembly one 1211 and support damping roller assembly two 1213 are also movably mounted on support base 121. Support damping roller assembly one 1211 and support damping roller assembly two 1213 are inclined to the opposite side.

[0037] An elastic bracket 124 is elastically supported on the support base 121. A support grid 1241 is fixedly connected to the top of the elastic bracket 124. The grid plate portion of the support grid 1241 passes upward through the gap between the roller shafts of the first support damping roller group 1211 and the second support damping roller group 1213. The top of the grid plate portion of the support grid 1241 is at the same height plane as the top of the connecting plate 11 and the top of the adjusting base 12.

[0038] The two support bases 121 on the same connecting plate 11 have inclined surfaces on opposite sides, and in the initial state, the bottoms of the connecting plate 11 and the support bases 121 are in contact with the ground;

[0039] Synchronization component 2 includes a gear 22 movably connected to support component 1, and a rack 21 movably connected to connecting plate 11 is meshed above and below the gear 22;

[0040] The two racks 21 are fixedly connected to the two support bases 121 at opposite ends;

[0041] Using the above scheme, the hydraulic support 5 drives the support assembly 1 upward. At this time, under the action of vehicle gravity, the support grille 1241 is pressed downward. Simultaneously, the vehicle tires will contact the second support damping roller group 1213 or the first support damping roller group 1211. When one of the tires on the vehicle is on the first support damping roller group 1211, the wheel will force one of the support seats 121 and rack 21 to move away from the connecting plate 11. The rotation of gear 22 will cause another rack 21 to drive another support seat 1241. 21. The wheels move synchronously and in opposite directions. Since each roller on the second support damping roller group 1213 or the first support damping roller group 1211 will rotate, the two sets of wheels will move along the second support damping roller group 1213 or the first support damping roller group 1211. Finally, the two sets of wheels are supported by the bottom ends of the second support damping roller group 1213 and the first support damping roller group 1211 and maintain their relative positions. This also ensures that the vehicle as a whole is always in the center position on the support assembly 1, thereby ensuring the stability of the vehicle during the lifting process.

[0042] Furthermore, when the two support seats 121 move in opposite directions, the limiting plate 122 extends outward. When the hydraulic support 5 moves in opposite directions and the support assembly 1 is reset, the bottom of the elastic support 124 will first contact the ground, and then the support seat 121, the support damping roller group 1211 and the bending block 1212 will continue to move downward until they contact the ground. During this process, the support grille 1241 will gradually replace the support damping roller group 1211 and the bending block 1212 in supporting the vehicle tires. Then the vehicle moves in opposite directions. Since there will be a gap between the support seat 121 and the connecting plate 11 at this time, the limiting plate 122 can support the vehicle to facilitate the vehicle's reversing.

[0043] It is worth noting that the initial distance between the two sets of support damping roller group 2 1213 and support damping roller group 1 1211 is smaller than the distance between the front and rear tires of a typical vehicle. This design ensures that at least one set of tires on the front and rear wheels of the vehicle is on support damping roller group 1 1211.

[0044] like Figure 1-3 As shown, the top of the connecting plate 11 is also provided with a through hole 111 that communicates with the piston end of the elastic damping limit rod 123; the diameter of the through hole 111 is smaller than the diameter of the cross section of the piston part of the elastic damping limit rod 123.

[0045] Using the above scheme, when the device resets, the vehicle will detach from the support assembly 1. At this time, the support seat 121 will reset under the action of the spring force of the elastic damping limit rod 123. At this time, the piston part at the elastic damping limit rod 123 will discharge the gas in the connecting plate 11 through the through hole 111. Since the diameter of the through hole 111 is smaller than the diameter of the piston of the elastic damping limit rod 123, the reset speed of the elastic damping limit rod 123 will be slowed down, thereby avoiding the situation where the support seat 121 collides with the connecting plate 11 or hits a person.

[0046] like Figure 2-6 As shown, one of the support bases 121 has a bending block 1212 hinged to one end near the connecting plate 11; the upper surface of the bending block 1212 located inside the support base 121 is at the same height as the top surface of the support base 121.

[0047] The other end of the bending block 1212 is located above the connecting plate 11 and is initially in an inclined state. When the bending block 1212 is rotated, the end of it located above the connecting plate 11 can be screwed into the connecting plate 11, and the upper surface of the other end of the bending block 1212 is inclined toward the connecting plate 11.

[0048] Using the above solution, the vehicle is moved above the support assembly 1. When the front wheels of the vehicle come into contact with the bending block 1212, the bending block 1212 will be squeezed to rotate, thereby causing the part of the bending block 1212 above the connecting plate 11 to rotate into the connecting plate 11. At this time, the other end of the bending block 1212 will be lifted up, thereby ensuring that the front and rear wheels of the vehicle can be located above the two support grilles 1241 respectively, which facilitates the positioning of the vehicle in the future.

[0049] Furthermore, when the vehicle is reset, the front wheel will compress the portion of the bent block 1212 away from the support 121 and rotate it back to its initial state.

[0050] like Figure 1-3 and Figure 7-8 As shown, the lifting assembly 3 includes a drive assembly 31 fixedly installed in the middle of the connecting plate 11 and a limiting crossbar 35 fixedly installed on both sides of the connecting plate 11; a slider 32 movably connected inside the connecting plate 11 and sleeved outside the limiting crossbar 35; and a connecting rod 33 symmetrically hinged to the end of the slider 32 away from the drive assembly 31.

[0051] The drive assembly 31 is used to drive the sliders 32 on both sides to move. The top of the connecting rod 33 is hinged to a top plate 36 that is movably connected to the connecting plate 11. In the initial state, the top surface of the top plate 36 is at the same height as the top surface of the connecting plate 11.

[0052] Using the above scheme, the two sets of sliders 32 are driven to move in opposite directions by the drive component 31, so that the top of the connecting rod 33 lifts the top plate 36. At this time, the upward movement of the top plate 36 will lift the chassis part between the front and rear wheels of the vehicle, thereby causing the tire part of the vehicle to disengage from the contact of the support damping roller group 1211, which makes it easier for the operator to repair or replace the vehicle wheel part.

[0053] like Figure 3 and Figure 7-8 As shown, a telescopic connecting rod 34 located below the top plate 36 is symmetrically hinged on the connecting plate 11, and the bottom axis of the telescopic connecting rod 34 is the rotation axis 341; the top of the telescopic connecting rod 34 is hinged to the top plate 36; the connecting rod 33 and the telescopic connecting rod 34 are arranged to cross and be staggered.

[0054] The connecting plate 11 is also symmetrically and movably connected with rubber blocks 4, which are movably sleeved on one end of the rotating shaft 341.

[0055] The rotating shaft 341 is also arranged in a circular array and has a guide groove 3411. The rubber block 4 has several convex shafts 41 that can slide in the guide groove 3411 respectively. Initially, the convex shafts 41 are located at the end of the guide groove 3411 near the telescopic connecting rod 34.

[0056] The rubber block 4 is arc-shaped at one end near the limiting plate 122, and can squeeze the limiting plate 122 when it moves toward the limiting plate 122.

[0057] Using the above scheme, the top plate 36 is moved upward by driving the slider 32 through the drive component 31. The top plate 36 also moves the top of the telescopic link 34 upward, thereby causing the telescopic link 34 to rotate and drive the rotating shaft 341 to rotate. This causes the guide groove 3411 to force the cam shaft 41 to move, which in turn causes the rubber block 4 to move toward the limiting plate 122 and deform, thereby fixing the limiting plate 122. This ensures that after the top plate 36 is released from supporting the vehicle, the vehicle tires are still between the first support damping roller group 1211 and the second support damping roller group 1213.

[0058] Working principle and usage process of this invention:

[0059] First, the operator moves the vehicle above the support assembly 1. When the front wheel of the vehicle comes into contact with the bending block 1212, it will squeeze the bending block 1212 to rotate, so that the part of the bending block 1212 above the connecting plate 11 rotates into the connecting plate 11. At this time, the other end of the bending block 1212 will be lifted up, so as to ensure that the front and rear wheels of the vehicle can be located above the two support grilles 1241 respectively, which facilitates the positioning of the vehicle later.

[0060] Subsequently, the hydraulic support 5 drives the support assembly 1 upward. At this time, due to the vehicle's gravity, the tires will press the support grille 1241 downward. Simultaneously, the vehicle tires will contact the second support damping roller group 1213 or the first support damping roller group 1211. When one of the tires on the vehicle is on the first support damping roller group 1211, the wheel will force the support seat 121 to move away from the connecting plate 11. Under the action of the synchronization assembly 2, it will drive the other support seat 121 to move synchronously and in the opposite direction. At the same time, since each roller on the second support damping roller group 1213 or the first support damping roller group 1211 will rotate, the two sets of wheels will move along the second support damping roller group 1213 or the first support damping roller group 1211. Finally, the two sets of wheels are supported by the bottom ends of the second support damping roller group 1213 and the first support damping roller group 1211 and maintain their relative positions unchanged. This also ensures that the vehicle as a whole is always in the center position on the support assembly 1.

[0061] When the vehicle tires need to be replaced or repaired, the operator runs the drive assembly 31 to drive the two sets of sliders 32 to move in opposite directions, so that the top of the connecting rod 33 lifts the top plate 36. At this time, the upward movement of the top plate 36 will lift the chassis part between the front and rear wheels of the vehicle, thereby causing the tire part of the vehicle to disengage from the contact of the support damping roller assembly 1211.

[0062] Before the top plate 36 lifts the vehicle, it will also drive the top of the telescopic link 34 to move upward, thereby causing the telescopic link 34 to rotate. At this time, the telescopic link 34 will also drive the rotating shaft 341 to rotate, thereby causing the guide groove 3411 to force the cam shaft 41 to move, driving the rubber pressure block 4 to move toward the limiting plate 122 and deform, thereby fixing the limiting plate 122. This ensures that after the top plate 36 releases the lifting of the vehicle, the vehicle tires are still between the first support damping roller group 1211 and the second support damping roller group 1213.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle repair lifting device with automatic vehicle alignment, comprising a support assembly (1) and a hydraulic support (5) for lifting the support assembly (1), said support assembly (1) comprising a connecting plate (11) and adjusting seats (12) disposed on both sides thereof, characterized in that, Also includes: Synchronization component (2), which is mounted on connecting plate (11) for the two retaining adjustment seats (12) to move synchronously and in opposite directions; The adjusting seat (12) includes a support seat (121) disposed on both sides of the connecting plate (11). Each of the two support seats (121) is fixedly connected to a limiting plate (122) and an elastic damping limiting rod (123) located inside the connecting plate (11). The limiting plate (122) is movably connected inside the connecting plate (11), and the elastic damping limiting rod (123) is elastically connected inside the connecting plate (11) to make the support seat (121) have a tendency to move toward the connecting plate (11). The support base (121) is also movably mounted with a first support damping roller group (1211) and a second support damping roller group (1213), which are inclined toward the opposite side. The support base (121) is elastically supported by an elastic bracket (124). The top of the elastic bracket (124) is fixedly connected to a support grid (1241). The grid plate portion of the support grid (1241) passes upward through the gap between the roller shafts of the first support damping roller group (1211) and the second support damping roller group (1213). The top of the grid plate portion of the support grid (1241) is at the same height plane as the top of the connecting plate (11) and the adjusting seat (12).

2. The vehicle repair lifting device with automatic vehicle alignment according to claim 1, characterized in that: The synchronization component (2) includes a gear (22) movably connected to the support component (1). The gear (22) is meshed with a rack (21) movably connected to the connecting plate (11) above and below. The two racks (21) are fixedly connected to two support seats (121) at opposite ends.

3. The vehicle repair lifting device with automatic vehicle alignment according to claim 2, characterized in that: The two support seats (121) on the same connecting plate (11) have inclined surfaces on opposite sides, and in the initial state, the bottom of the connecting plate (11) and the support seats (121) are in contact with the ground.

4. The vehicle repair lifting device with automatic vehicle alignment according to claim 3, characterized in that: The top of the connecting plate (11) is also provided with a through hole (111) that communicates with the piston end of the elastic damping limit rod (123). The diameter of the through hole (111) is smaller than the diameter of the cross section of the piston part of the elastic damping limit rod (123).

5. The vehicle repair lifting device with automatic vehicle alignment according to claim 4, characterized in that: One of the support bases (121) has a bent block (1212) hinged at one end near the connecting plate (11); The upper surface of one end of the bending block (1212) inside the support base (121) is at the same height as the top surface of the support base (121). The other end of the bending block (1212) is located above the connecting plate (11) and is initially in an inclined state. When the bending block (1212) is rotated, the end of it located above the connecting plate (11) can be screwed into the interior of the connecting plate (11).

6. The vehicle repair lifting device with automatic vehicle alignment according to claim 5, characterized in that: The connecting plate (11) is also provided with a lifting component (3); The lifting assembly (3) includes a drive assembly (31) fixedly installed in the middle of the connecting plate (11) and limiting crossbars (35) fixedly installed on both sides of the connecting plate (11); it also includes; A slider (32) is movably connected inside the connecting plate (11) and sleeved outside the limiting crossbar (35); A connecting rod (33) is symmetrically hinged to the end of the slider (32) away from the drive assembly (31). The drive assembly (31) is used to drive the sliders (32) on both sides to move. The top of the connecting rod (33) is hinged to a top plate (36) that is movably connected to the connecting plate (11). The top surface of the top plate (36) is initially at the same height as the top surface of the connecting plate (11).

7. The vehicle repair lifting device with automatic vehicle alignment according to claim 6, characterized in that: The connecting plate (11) is also symmetrically hinged with a telescopic connecting rod (34) located below the top plate (36), and the bottom axis of the telescopic connecting rod (34) is a rotating axis (341). The top end of the telescopic link (34) is hinged to the top plate (36).

8. The vehicle repair lifting device with automatic vehicle alignment according to claim 7, characterized in that: The connecting rod (33) and the telescopic connecting rod (34) are arranged to cross and be staggered; The connecting plate (11) is also symmetrically and movably connected with rubber blocks (4), which are movably sleeved on one end of the rotating shaft (341); The rotating shaft (341) is also arranged in a circular array and has a guide groove (3411). The rubber block (4) has several convex shafts (41) that can slide in the guide groove (3411). Initially, the convex shafts (41) are located at the end of the guide groove (3411) near the telescopic connecting rod (34). The rubber block (4) is arc-shaped at the end near the limiting plate (122), and the rubber block (4) can squeeze the limiting plate (122) when it moves toward the limiting plate (122).

Images