Automobile seat side armrest regulator assembly

Abstract

The utility model discloses an automobile seat side armrest adjuster assembly, which relates to the field of automobile seat side armrests and comprises a shell and a side cover, the side cover is mounted on one side of the shell, a center rod assembly is sleeved in the side cover, the side cover comprises a positioning hole mounted on one side of the shell, a second insertion hole is formed in the positioning hole, and the center rod assembly is inserted into the second insertion hole. The center rod assembly is installed on a center rod in the second inserting hole, an arc-shaped groove is formed in the outer wall of the center rod, a center groove is formed in the outer wall of the center rod, a limiting piece is installed on one side of the shell, and a clamping piece is arranged on one side of the limiting piece. According to the automobile seat side armrest, the problem that the angle of an existing automobile seat side armrest is inconvenient to adjust is solved, the angle of the armrest can be adjusted through the rotating ring assembly, the auxiliary ratchet wheel assembly, the blocking assembly and the hook plate during angle adjustment, the armrest is limited according to the ratchet wheel principle, and the requirement for arm supporting can be met.

Description

Technical Field

[0001] The utility model relates to the field of automobile seat side armrests, in particular to an automobile seat side armrest adjuster assembly. Background Art

[0002] Car seats can be divided into split seats and long seats according to their shape; they can be divided into fixed, detachable and adjustable types according to their function; they can be divided into single, double and multi-person chairs according to the number of passengers. According to the performance of the seats, they have developed from the earliest fixed seats to multi-functional power-adjustable seats, including air-cushion seats, electric seats, stereo seats, mental recovery seats, and electronically adjustable seats. According to the material, they can be divided into leather seats and velvet seats, etc. Car seats can be roughly divided into the following types according to their parts: front seats: headrests, backrests, seat cushions, armrests; rear seats: headrests, backrests, seat cushions, side wings, armrests. The side armrests of car seats are used to support people's arms when riding.

[0003] When adjusting the existing car seat side armrests, the side armrests can only be adjusted to a completely horizontal or vertical state, and the angle cannot be adjusted according to people's habits during use, which makes people's arms uncomfortable to place. Utility Model Content

[0004] Based on this, the purpose of the present invention is to provide a car seat side armrest adjuster assembly to solve the technical problems mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a car seat side armrest adjuster assembly, comprising a shell and a side cover, wherein the side cover is installed on one side of the shell, and a center rod assembly is sleeved inside the side cover, the side cover comprises a positioning hole installed on one side of the shell, and a second plug hole is opened inside the positioning hole, the center rod assembly is installed on the center rod inside the second plug hole, and an arc groove is opened on the outer wall of the center rod, and a center groove is opened on the outer wall of the center rod, a limiting member is installed on one side of the shell, and a clamping member is provided on one side of the limiting member, a rotating ring assembly is provided on one side of the clamping member, and a bottom cover is provided on one side of the rotating ring assembly, and the rotating ring assembly comprises The cam is provided with a toothed plate on one side of the outer wall of the mounting ring, and a baffle is provided on one side of the bottom of the housing; a secondary ratchet is provided on one side of the side cover, and a second spring is provided on one side of the secondary ratchet; a plurality of tooth blocks are fixed on the outer wall of the secondary ratchet, a through hole is provided on the inside of the secondary ratchet, a lower boss and an upper boss are provided on one side of the secondary ratchet, a hook plate is provided on one side of the side cover, and a convex hook is fixed on the end of the hook plate.

[0006] By adopting the above technical solution, the problem of inconvenient angle adjustment of the existing car seat side armrests is solved. When adjusting the angle, the armrest angle can be adjusted by rotating the ring assembly, the auxiliary ratchet assembly, the blocking assembly and the hook plate, and it is limited by the ratchet principle to meet the needs of arm support.

[0007] The utility model is further configured such that a first mounting hole, a first insertion hole and a limiting hole are provided inside the shell, a third mounting hole is provided inside the side cover, a second rivet is provided inside the first mounting hole and the third mounting hole, and a fixing ring is fixed in the middle of the second rivet.

[0008] By adopting the above technical solution, the second rivet is installed in the first mounting hole and the fourth mounting hole on the outer wall of the shell and the side cover. During installation, the fixing ring on the outer wall of the second rivet fits with both sides of the shell and the side cover, avoiding problems of non-parallelism or insufficient strength during installation. It has high strength and good stability in use.

[0009] The present invention is further configured such that a second mounting hole is opened on one side of the shell, a fourth mounting hole is opened inside the side cover, and bolts are provided inside the fourth mounting hole and the second mounting hole, and the shell and the side cover are fixedly connected by the bolts.

[0010] By adopting the above technical solution, the bolts can fix the housing and the side cover together.

[0011] The utility model is further configured such that the outer wall of the limiting member is fixed with multiple groups of protruding blocks, and grooves are provided inside the protruding blocks, an inner groove is provided on one side of the limiting member, a protruding block is fixed inside the limiting member, and a first card slot is fixed on one side of the limiting member.

[0012] By adopting the above technical solution, the inner groove on one side of the limiter serves to install the first spring and position the center rod. The inner groove of the limiter is used to install the first spring so that it is positioned inside to prevent movement. The raised blocks and bosses on the outer wall of the limiter are interference fit to ensure concentricity and prevent movement in the limiter holes and positioning grooves inside the shell. The card groove and the collar on the outer wall of the limiter are used for limiting positioning, so that the concentricity of the axis is more precise and will not affect the rotation of the overall mechanism, thereby achieving lightweight and firmness and increasing service life.

[0013] The utility model is further configured such that the outer wall of the bottom cover is fixed with multiple groups of protruding blocks, and one side of the bottom cover is fixed with multiple groups of arc blocks, the middle of the bottom cover is provided with an inner hole, and one side of the bottom cover is provided with a C-shaped semicircular groove.

[0014] By adopting the above technical solution, the bottom arc block and the protruding block cooperate with the side cover to ensure concentricity and prevent movement in the positioning hole. The C-shaped semicircular groove of the bottom cover and the outer circle of the ring are positioned to make the axis concentricity more precise and will not affect the rotation of the overall mechanism. The inner hole of the bottom cover has a small amount of damping force, thereby solving the risk of insufficient torque. The bottom cover is made of highly wear-resistant pom material, which greatly improves service life and stability.

[0015] The utility model is further configured such that the engaging member comprises a collar movably mounted on one side of the limiting member, a hexagonal groove is provided inside the collar, and a protrusion is fixed on the outer wall of the collar.

[0016] By adopting the above technical solution, the engaging part and the collar cooperate with the groove on the outer wall of the limiting part to perform positioning and prevent movement, thereby improving concentricity and precise positioning. The protrusion on the outer wall of the collar cooperates with the positioning groove inside the mounting ring to perform limited positioning, thereby driving the mounting ring to rotate as the center rod rotates.

[0017] The present invention is further configured such that a first stopper and a second stopper are fixed to one side of the baffle, and a movable hole is opened on one side of the baffle.

[0018] By adopting the above technical solution, the main function of the baffle is to make the second spring able to be unlocked or locked very conveniently. The position of the baffle cooperates with the second spring to act as a pre-tightening force, and the upper boss on one side of the secondary ratchet and the second spring also act as a pre-tightening force. When both sides of the second spring are supported, the pre-tightening force will apply force to both sides, so that the tooth ring on the outside of the mounting ring cooperates with the tooth shape of the secondary ratchet to achieve angle adjustment. The position of the baffle is fastened to the shell by the first rivet to make it firm and stable. The first block and the second block on one side of the baffle are engaged with the end of the second spring to prevent the second spring from moving when in the unlocked state and to prevent the second spring from falling off.

[0019] The present invention is further configured such that a shell hole is provided at the bottom of the shell, and a first rivet is provided inside the shell hole.

[0020] By adopting the above technical solution, the baffle can be conveniently fixed inside the shell through the first rivet to prevent it from shaking.

[0021] The present invention is further configured such that washers are sleeved on both ends of the second rivet, and the washers are located at both ends of the fixing ring.

[0022] By adopting the above technical solution, the washers located at both ends of the fixing ring play a role in reducing the gap between the shell and the side cover, and protecting the friction between metal and metal, thereby improving the service life and wear resistance, which complies with mechanical principles.

[0023] In summary, the present invention has the following beneficial effects:

[0024] The utility model solves the problem of inconvenient angle adjustment of the existing car seat side armrests by providing a shell, a side cover, a limiter, a center rod assembly, a first spring and a bottom cover. When adjusting the angle, the armrest can be adjusted by rotating the ring assembly, the auxiliary ratchet assembly, the blocking assembly and the hook plate, and it is limited by the ratchet principle to meet the need for arm support. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the utility model;

[0026] Figure 2 It is a side view of the utility model;

[0027] Figure 3 This is a schematic structural diagram of the housing of the utility model;

[0028] Figure 4 This is a schematic structural diagram of the side cover of the utility model;

[0029] Figure 5It is a three-dimensional diagram of the limiting member of the utility model;

[0030] Figure 6 A three-dimensional diagram of the center rod of the utility model;

[0031] Figure 7 It is a three-dimensional diagram of the first spring of the utility model;

[0032] Figure 8 This is a three-dimensional diagram of the bottom cover of the utility model;

[0033] Figure 9 A three-dimensional diagram of the engaging member of the present utility model;

[0034] Figure 10 A three-dimensional diagram of the mounting ring of the utility model;

[0035] Figure 11 It is a three-dimensional diagram of the second spring of the utility model;

[0036] Figure 12 It is a three-dimensional diagram of the auxiliary ratchet of the utility model;

[0037] Figure 13 A three-dimensional diagram of the baffle of the utility model;

[0038] Figure 14 A three-dimensional diagram of the hook plate of the utility model;

[0039] Figure 15 This is a three-dimensional diagram of the second rivet of the present invention;

[0040] Figure 16 This is a schematic diagram of the disassembly of the utility model;

[0041] Figure 17 This is a schematic diagram of the connection between the rotating ring assembly and the secondary ratchet of the utility model;

[0042] Figure 18 This is a schematic diagram of the installation structure of the limiting component of the utility model.

[0043] In the figure: 10, housing; 101, first mounting hole; 102, first insertion hole; 103, second mounting hole; 104, housing hole; 105, limiting hole; 106, positioning groove; 20, side cover; 201, third mounting hole; 202, positioning hole; 203, fourth mounting hole; 204, second insertion hole; 30, washer; 40, limiting member; 40, raised block; 401, inner groove; 402, protruding block; 403, first slot; 404, groove; 405, boss; 50, center rod assembly; 50, center rod; 501, arc groove; 502, center groove; 60, first spring; 70, bottom cover; 701, arc block; 702, C-shaped semicircular groove; 703, protruding block; 704, inner hole; 80, engaging part; 801, protrusion; 802, collar; 803, hexagonal slot; 90, rotating ring assembly; 901, mounting ring; 902, positioning slot; 903, second slot; 904, gear ring; 905, inclined surface; 906, semicircular slot; 100, second spring; 110, secondary ratchet; 1101, gear block; 1102, lower boss; 1103, upper boss; 1104, through hole; 12, baffle; 1201, first block; 1202, second block; 1203, movable hole; 130, hook plate; 1301, convex hook; 140, first rivet; 150, second rivet; 1501, fixing ring. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] The following describes an embodiment of the present invention based on its overall structure.

[0046] A car seat side armrest adjuster assembly, such as Figure 1 - Figure 18As shown, it includes a shell 10 and a side cover 20, the side cover 20 is installed on one side of the shell 10, and the center rod assembly 50 is sleeved inside the side cover 20, the side cover 20 includes a positioning hole 202 installed on one side of the shell 10, and a second plug hole 204 is opened inside the positioning hole 202, the center rod assembly 50 is installed on the center rod 501 inside the second plug hole 204, and the outer wall of the center rod 501 is opened with an arc groove 502, and the outer wall of the center rod 501 is opened with a center groove 503, a limit member 40 is installed on one side of the shell 10, and a locking member is provided on one side of the limit member 40 80, a rotating ring assembly 90 is provided on one side of the engaging member 80, and a bottom cover 70 is provided on one side of the rotating ring assembly 90, the rotating ring assembly 90 includes a mounting ring 901, and a semicircular groove 906 is provided on the outer wall of the mounting ring 901, a positioning groove 902 is provided inside the mounting ring 901, a gear ring 904 is provided on one side of the outer wall of the mounting ring 901, and a slope 905 is provided on one side of the outer wall of the mounting ring 901, a second slot 903 is provided on the outer wall of the mounting ring 901, one side of the bottom cover 70 is connected to the side cover 20, a first spring 60 is installed on one side of the shell 10, and the shell A baffle 120 is installed on one side of the bottom of the body 10, a secondary ratchet 110 is installed on one side of the side cover 20, and a second spring 100 is provided on one side of the secondary ratchet 110, a plurality of tooth blocks 1101 are fixed on the outer wall of the secondary ratchet 110, a through hole 1104 is opened inside the secondary ratchet 110, a lower boss 1102 and an upper boss 1103 are provided on one side of the secondary ratchet 110, a hook plate 130 is provided on one side of the side cover 20, a convex hook 1301 is fixed on the end of the hook plate 130, and a first mounting hole 101, a first plug hole 102, a limiting hole 105 and a Positioning groove 106, a third mounting hole 201 is opened inside the side cover 20, a second rivet 150 is set inside the first mounting hole 101 and the third mounting hole 201, and a fixing ring 1501 is fixed to the middle of the second rivet 150, the second rivet 150 is installed in the first mounting hole 101 and the fourth mounting hole 203 on the outer wall of the shell 10 and the side cover 20. During installation, the fixing ring 1501 on the outer wall of the second rivet 150 fits with both sides of the shell 10 and the side cover 20 to avoid problems of non-parallelism or insufficient strength during installation, with high strength and good stability in use.

[0047] See also Figure 1 、 Figure 3 and Figure 4 A second mounting hole 103 is provided on one side of the shell 10, and a fourth mounting hole 203 is provided inside the side cover 20. Bolts are provided inside the fourth mounting hole 203 and the second mounting hole 103. The shell 10 and the side cover 20 are fixedly connected by bolts. The bolts can fix the shell 10 and the side cover 20.

[0048] See also Figure 1 and Figure 5The outer wall of the limiter 40 is fixed with multiple groups of protruding blocks 401, and the interior of the protruding blocks 401 is provided with grooves 405. An inner groove 402 is provided on one side of the limiter 40, and a protruding block 403 is fixed on the interior of the limiter 40. One side of the limiter 40 is fixed with multiple groups of bosses 405. One side of the limiter 40 is fixed with a first slot 404. The inner groove 402 on one side of the limiter 40 serves to install the first spring 60 and position the center rod 501. The inner groove of the limiter 40 402 is used to install the first spring 60 so that it is positioned inside to prevent movement. The raised block 401 and the boss 405 on the outer wall of the limiter 40 are interference fit to ensure concentricity and prevent movement and are positioned in the limit hole 105 and the positioning groove 106 inside the shell 10. The first card groove 404 on the outer wall of the limiter 40 is positioned with the ring 802 to make its axial concentricity more accurate and will not affect the rotation of the overall mechanism, thereby achieving lightweight and firmness and increasing service life.

[0049] See also Figure 2 and Figure 8 , the outer wall of the bottom cover 70 is fixed with multiple groups of protruding blocks 703, and one side of the bottom cover 70 is fixed with multiple groups of arc blocks 701, the middle part of the bottom cover 70 is provided with an inner hole 704, and one side of the bottom cover 70 is provided with a C-shaped semicircular groove 702. The center of the inner hole 704 inside the bottom cover 70 passes through the center rod 501, and the bottom arc block 701 and the protruding block 703 cooperate with the side cover 20 to ensure concentricity and prevent movement and are positioned in the positioning hole 202. The C-shaped semicircular groove 702 of the bottom cover 70 and the outer circle of the ring 802 are limited and positioned to make the axial concentricity more accurate and will not affect the rotation of the overall mechanism. The inner hole 704 of the bottom cover 70 has a small amount of damping force, thereby solving the risk of insufficient torque. The bottom cover 70 is made of pom highly wear-resistant material, which greatly improves the service life and stability.

[0050] See also Figure 9 and Figure 16 The engaging member 80 includes a collar 802 movably mounted on one side of the limiting member 40, and a hexagonal groove 803 is provided inside the collar 802, and a protrusion 801 is fixed to the outer wall of the collar 802. The engaging member 80 and the collar 802 cooperate with the first groove 404 on the outer wall of the limiting member 40 to perform positioning and prevent movement, thereby improving concentricity and accurate positioning. The protrusion 801 on the outer wall of the collar 802 cooperates with the positioning groove 902 inside the mounting ring 901 to perform limited positioning, thereby driving the mounting ring 901 to rotate as the center rod 501 rotates.

[0051] See also Figure 17A first stopper 1201 and a second stopper 1202 are fixed to one side of the baffle 120. A movable hole 1203 is opened on one side of the baffle 120. The main function of the baffle 120 is to make it very convenient to unlock or lock the second spring 100. The position of the baffle 120 cooperates with the second spring 100 to play a role of pre-tightening force. The upper boss 1103 on one side of the secondary ratchet 110 and the second spring 110 also play a role of pre-tightening force. When both sides of the second spring 110 are When it is pressed, the pre-tightening force will apply force to both sides, so that the tooth ring 904 on the outside of the mounting ring 901 cooperates with the tooth shape of the secondary ratchet 110 to achieve angle adjustment. The position of the baffle 120 is fastened to the shell 10 by the first rivet 140 to make it firm and stable. The first stop block 1201 and the second stop block 1202 on one side of the baffle 120 are engaged with the end of the second spring 100 to prevent the second spring 100 from moving when it is in the unlocked state and to prevent the second spring 100 from falling off.

[0052] See also Figure 16 and Figure 17 A shell hole 104 is provided at the bottom of the shell 10, and a first rivet 140 is provided inside the shell hole 104. The first rivet 140 can be used to conveniently fix the baffle 120 inside the shell 10 to prevent it from shaking.

[0053] See also Figure 16 The two ends of the second rivet 150 are sleeved with washers 30, and the washers 30 are located at both ends of the fixing ring 1501. The washers 30 are located at both ends of the fixing ring 1501 to reduce the gap between the shell 10 and the side cover 20, and to protect the friction between metal and metal, thereby improving its service life and wear resistance, which conforms to mechanical principles.

[0054] The working principle of the present invention is as follows: the armrest is connected to the center rod 501. When the angle of the armrest needs to be adjusted, the armrest drives the center rod 501 to rotate. The rotation of the center rod 501 drives the limiter 40 to rotate. When the limiter 40 rotates, it squeezes the first spring 60. When the center rod 501 rotates, it drives the collar 802 that cooperates with the center groove 503 to rotate. When the collar 802 rotates, the protrusion 801 on its outer wall cooperates with the positioning groove 902 on the inner wall of the mounting ring 901, so that when the collar 802 rotates, it drives the mounting ring 901 to rotate. When the mounting ring 901 rotates, it drives the gear ring 90 4 is rotated, the gear ring 904 rotates to cooperate with the auxiliary ratchet assembly 110, and the gear ring 904 cooperates with the tooth block 1101 on the outer wall of the auxiliary ratchet 110. When rotating in the opposite direction, the two right-angled surfaces will conflict with each other and be fixed, thereby achieving the purpose of limiting the center rod 501. When the armrest needs to be reset, the hook plate 130 is rotated, and the convex hook 1301 at the end of the hook plate 130 will contact the lower boss 1102, thereby completing the unlocking of the mounting ring 901. Under the action of the second spring 100, the mounting ring 901 is driven to reset, and at the same time, the center rod 501 is reset under the action of the first spring 60.

[0055] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A vehicle seat side armrest adjuster assembly, comprising a housing (10) and a side cover (20), characterized in that: A side cover (20) is installed on one side of the housing (10), and a center rod assembly (50) is sleeved inside the side cover (20), the side cover (20) includes a positioning hole (202) installed on one side of the housing (10), and a second plug hole (204) is opened inside the positioning hole (202), the center rod assembly (50) is installed on the center rod (501) inside the second plug hole (204), and an arc groove (502) is opened on the outer wall of the center rod (501), and the center rod (501) is installed on the inner wall of the second plug hole (204). ) is provided with a central groove (503) on the outer wall of the housing (10), a limiting member (40) is installed on one side of the limiting member (40), and a locking member (80) is provided on one side of the locking member (80), a rotating ring assembly (90) is provided on one side of the locking member (80), and a bottom cover (70) is provided on one side of the rotating ring assembly (90), the rotating ring assembly (90) includes a mounting ring (901), and a semicircular groove (906) is provided on the outer wall of the mounting ring (901), and the inner opening of the mounting ring (901) is A positioning groove (902) is provided, a toothed ring (904) is provided on one side of the outer wall of the mounting ring (901), and a slope (905) is provided on one side of the outer wall of the mounting ring (901), a second clamping groove (903) is opened on the outer wall of the mounting ring (901), one side of the bottom cover (70) is connected to the side cover (20), a first spring (60) is installed on one side of the housing (10), and a baffle (120) is installed on one side of the bottom of the housing (10), and a second clamping groove (903) is opened on the outer wall of the mounting ring (901), a first spring (60) is installed on one side of the bottom of the housing (10), and a baffle (120) is installed on one side of the side cover (20) A secondary ratchet (110) is provided, and a second spring (100) is provided on one side of the secondary ratchet (110); a plurality of tooth blocks (1101) are fixed to the outer wall of the secondary ratchet (110); a through hole (1104) is provided inside the secondary ratchet (110); a lower boss (1102) and an upper boss (1103) are provided on one side of the secondary ratchet (110); a hook plate (130) is provided on one side of the side cover (20); a convex hook (1301) is fixed at the end of the hook plate (130).

2. The automobile seat side armrest adjuster assembly according to claim 1, characterized in that: A first mounting hole (101), a first insertion hole (102) and a limiting hole (105) are provided inside the housing (10); a third mounting hole (201) is provided inside the side cover (20); a second rivet (150) is provided inside the first mounting hole (101) and the third mounting hole (201), and a fixing ring (1501) is fixed in the middle of the second rivet (150).

3. The automobile seat side armrest adjuster assembly according to claim 1, characterized in that: A second mounting hole (103) is provided on one side of the housing (10), a fourth mounting hole (203) is provided inside the side cover (20), and bolts are provided inside the fourth mounting hole (203) and the second mounting hole (103), and the housing (10) and the side cover (20) are fixedly connected by the bolts.

4. The automobile seat side armrest adjuster assembly according to claim 1, characterized in that: The outer wall of the limiting member (40) is fixed with multiple groups of protruding blocks (401), and the interior of the protruding blocks (401) is provided with grooves (405), one side of the limiting member (40) is provided with an inner groove (402), the interior of the limiting member (40) is fixed with a protruding block (403), and one side of the limiting member (40) is fixed with a first clamping groove (404).

5. The automobile seat side armrest adjuster assembly according to claim 1, characterized in that: The outer wall of the bottom cover (70) is fixed with multiple groups of protruding blocks (703), and one side of the bottom cover (70) is fixed with multiple groups of arc blocks (701). The middle of the bottom cover (70) is provided with an inner hole (704), and one side of the bottom cover (70) is provided with a C-shaped semicircular groove (702).

6. The automobile seat side armrest adjuster assembly according to claim 1, characterized in that: The engaging member (80) comprises a collar (802) movably mounted on one side of the limiting member (40), a hexagonal groove (803) is provided inside the collar (802), and a protrusion (801) is fixed on the outer wall of the collar (802).

7. The automobile seat side armrest adjuster assembly according to claim 1, characterized in that: A first stopper (1201) and a second stopper (1202) are fixed on one side of the baffle (120), and a movable hole (1203) is opened on one side of the baffle (120).

8. The automobile seat side armrest adjuster assembly according to claim 7, characterized in that: A shell hole (104) is provided at the bottom of the shell (10), and a first rivet (140) is provided inside the shell hole (104).

9. The automobile seat side armrest adjuster assembly according to claim 2, characterized in that: Washers (30) are sleeved on both ends of the second rivet (150), and the washers (30) are located at both ends of the fixing ring (1501).

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