Lock catch device and terminal support

Abstract

The utility model discloses a locking device and a terminal support, and belongs to the technical field of mobile terminal peripheral accessories. The lock catch device comprises a suction cup, a lock catch assembly and a seat body, one side of the suction cup is rotationally connected with the lock catch assembly, the suction cup is further provided with the seat body on the same side of the lock catch assembly, the end, away from the suction cup, of the lock catch assembly penetrates through the seat body, and when the lock catch assembly is in a locked state, the seat body is pressed on the suction cup; when the lock catch assembly is in a locked state, the seat body is separated from the suction cup; the joint of the lock catch assembly and the suction cup is arranged between the pressed face of the base body and the suction cup, and one side of the lock catch device is hinged to the cantilever device. By the adoption of the locking device, the whole outer surface of the shaft body makes contact with the base body, the contact area is far larger than the contact area of a rotating shaft and the base body in the prior art, and the structure is more stable and not prone to damage; the base body and the suction cup are rotationally connected to the bottom of the base body, and the problem that the root of the mandrel is prone to breakage due to a long force arm in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of mobile terminal peripheral accessories, and in particular to a locking device and a terminal bracket. Background Art

[0002] Chinese utility model disclosure specification CN216768867U discloses a support and terminal bracket. In the device, a core shaft is provided on one side of the suction cup facing the support seat, the core shaft penetrates the support seat, a rotary lock is rotatably connected to the core shaft in a first direction through a connecting piece, a slideway is provided on the support seat along the axial extension direction of the core shaft, the rotary lock and the connecting piece are connected through a rotating shaft and realize a rotational connection in a second direction, and at least one end of the rotating shaft is exposed and accommodated in the slideway and can slide along the slideway.

[0003] In this technical solution, the rotation connection between the rotary lock and the suction cup is located at the top of the support seat, there is a large gap between the components, the mandrel force arm is long, and the increase in torque will cause bending stress at the root of the mandrel, making the root of the mandrel on the suction cup easy to damage. In addition, the connector and the rotary lock are constrained by the point contact between the rotating shaft and the slideway of the support seat, so that the rotary lock, the connector and the support seat rotate around the mandrel at the same time, but their stability is poor and they are easy to damage. Summary of the invention

[0004] The present application provides a locking device and a terminal bracket. The locking device according to the present application can overcome at least one or more problems existing in the prior art.

[0005] In a first aspect of the present application, a locking device is provided, comprising a suction cup, a locking assembly and a seat body, wherein one side of the suction cup is rotatably connected to the locking assembly, the suction cup is further provided with a seat body on the same side of the locking assembly, and the locking assembly is arranged through the seat body at one end away from the suction cup.

[0006] When the lock assembly is in a locked state, the seat body is pressed and held on the suction cup by the lock assembly;

[0007] When the lock assembly is in the unlocked state, the seat body and the suction cup are separated by the lock assembly;

[0008] The connection between the locking assembly and the suction cup is located between the pressing surface of the seat body held by the locking assembly and the suction cup.

[0009] In the locking device provided by the present application, the entire outer surface of the shaft is in contact with the seat body, and the contact area is much larger than the contact surface between the rotating shaft and the seat body in the prior art. The structure is more stable and not easy to be damaged. The rotating connection between the seat body and the suction cup is located at the bottom of the seat body, avoiding the problem of easy breakage of the root of the core shaft due to the long force arm in the prior art.

[0010] In one possible implementation, the locking assembly includes an axle, a buckle and an elastomer, one end of the axle is rotatably connected to the suction cup, and the other end is hinged to the buckle; the elastomer is elastic and is arranged between the base body and the suction cup, and the elastomer keeps the base body away from the suction cup in the absence of external force; the distance from the rotation center of the buckle to the contact surface between the buckle and the base body is greater in the locked state than in the unlocked state.

[0011] In a possible implementation, at least one limiting end face is provided on the outer periphery of the shaft body, the outer contour of the shaft body is matched with the limiting hole on the seat body, and the limiting end face constrains the freedom of the seat body in the circumferential direction of the shaft body.

[0012] In one possible implementation, a supporting portion is provided at one end of the buckle, and the supporting portion is hinged through an axis rod and an end of the shaft body passing through the seat body. When the lock assembly is in a locked state, the first surface of the supporting portion abuts against the seat body; when the lock assembly is in an unlocked state, the second surface of the supporting portion abuts against the seat body; the distance from the first surface of the supporting portion to the axis center of the shaft rod is greater than the distance from the second surface of the supporting portion to the axis center of the shaft rod.

[0013] In a possible implementation, the suction cup is provided with an outer tooth portion on a side connected to the shaft body, and the seat body is provided with an inner tooth portion matching the outer tooth portion on a side facing the suction cup. When the locking assembly is in a locked state, the outer tooth portion and the inner tooth portion are engaged to limit the rotation of the shaft body relative to the suction cup.

[0014] In one possible implementation, an annular inner wall is provided inside the seat body above the outer tooth portion, an inner tooth portion is provided on the bottom surface of the inner wall, both the outer tooth portion and the inner tooth portion are annular tooth groove structures, the elastomer is sleeved in the inner wall, and the inner wall constrains the spring to deviate axially.

[0015] In a possible implementation, the suction cup includes a main part, a soft rubber part and an end part of the shaft, wherein the main part is in a disc shape and the soft rubber part is arranged on its outer periphery. The end part of the shaft is arranged on one side of the main part facing the shaft body, wherein the material hardness of the end part of the shaft and the main part is higher than the material hardness of the soft rubber part.

[0016] In a possible implementation, the shaft end is a rotating body arranged along the normal direction of the suction cup adsorption surface, and the shaft end is axially connected to the shaft body, allowing the shaft body to rotate circumferentially but limiting its axial movement.

[0017] In one possible implementation, the shaft end is a cylinder, the outer end face of the shaft end is a flange with a larger diameter, and the flange is also a cylinder; a first cavity adapted to the shaft end is provided at the bottom of the shaft body, and the inner edge of the bottom of the shaft body abuts against the side of the flange facing the suction cup.

[0018] In one possible implementation, a flat surface is provided on both sides of the shaft at the top of the seat body for contacting the buckle; when the lock assembly is in a locked state, the first abutment surface of the abutment portion on the buckle abuts against the surface; when the lock assembly is in an unlocked state, the second abutment surface of the abutment portion on the buckle abuts against the surface.

[0019] In a possible implementation, a limiting plate is vertically provided on the table surface outside the abutting portion to limit the movement of the buckle in the axial direction of the shaft.

[0020] In a possible implementation, a surface of the seat body that contacts the suction cup is an annular surface, and the size of the annular surface matches the size of the soft rubber portion on the suction cup.

[0021] In a second aspect of the present application, the present application further provides a terminal bracket, which includes a locking device and a cantilever device, wherein the cantilever device includes a rotating arm and a sliding arm, the rotating arm is hingedly connected to the locking device, and the sliding arm can slide along the extension direction of the rotating arm.

[0022] In a possible implementation, a slideway is provided in the rotating arm, and a slide rail is provided on at least one side wall of the slideway; the outer contour of the sliding arm is adapted to the slideway of the rotating arm, and a slide groove is provided on the surface of the sliding arm adjacent to the slide rail.

[0023] In a possible implementation manner, the rotating arm is arc-shaped in the extension direction.

[0024] In a possible implementation, a connecting end is provided on the free end of the sliding arm, and the connecting end can be directly / indirectly connected to the mobile terminal.

[0025] In a possible implementation, the rotating arm is hinged to the locking device via a first fastener, the first fastener includes a long screw and a first nut, and the clamping force of the rotating arm on the hinge seat of the locking device is adjusted by adjusting the position of the first nut relative to the long screw.

[0026] In one possible implementation, the rotating arm adjusts the clamping state of the sliding arm through a second fastener, and the second fastener includes a second nut and a short screw, and the short screw is arranged on the side of the rotating arm; the second nut is locked, and the short screw is pressed against the sliding arm, and the second nut is unscrewed, and the short screw is away from the sliding arm.

[0027] It should be noted that various possible implementation methods of any one of the above aspects can be combined under the premise that there is no contradiction between the solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a locking device provided in an embodiment of the present application.

[0029] Figure 2 It is a three-dimensional partial cross-sectional view of a locking device provided in an embodiment of the present application.

[0030] Figure 3 It is a partial cross-sectional view of a locking device provided in an embodiment of the present application.

[0031] Figure 4 yes Figure 2 A partial enlarged view of the connection between the buckle and the shaft in the locking device.

[0032] Figure 5 It is a structural schematic diagram of a terminal bracket provided in an embodiment of the present application.

[0033] Figure 6 It is a structural schematic diagram of a cantilever device provided in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 1. Locking device; 10. Suction cup; 11. Main body; 111. Soft rubber part; 12. External tooth part; 13. Shaft end; 131. Flange; 20. Shaft body; 21. First cavity; 22. Limit end face; 201. Shaft rod; 30. Seat body; 31. Inner wall; 311. Inner tooth part; 32. Limit hole; 33. Table; 331. Limit plate; 40. Elastomer; 50. Cover body; 51. Hinge seat; 60. Buckle; 61. Abutment part; 2. Cantilever device; 70. Rotating arm; 71. Slideway; 72. Slide rail; 73. First fastener; 74. Second fastener; 80. Sliding arm; 81. Slide groove; 90. Connecting end. DETAILED DESCRIPTION

[0036] The present application will be described below with reference to the accompanying drawings, wherein the accompanying drawings illustrate several embodiments of the present application. However, it should be understood that the present application can be presented in a variety of different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present application more complete and fully explain the scope of protection of the present application to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0037] It should be understood that in all the drawings, the same reference numerals represent the same elements. In the drawings, the dimensions of certain features may be deformed for clarity. The terms used in the specification are only used to describe specific embodiments and are not intended to limit the present application. All terms (including technical terms and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, well-known functions or structures may not be described in detail.

[0038] The singular forms "a", "said" and "the" used in the specification include plural forms unless clearly indicated. The terms "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the relevant listed items.

[0039] In the specification, when an element is said to be "on", "attached", "connected", "coupled" or "contacting" another element, the element may be directly on, attached, connected, coupled or contacting another element, or there may be intermediate elements. In contrast, when an element is said to be "directly" "on", "directly attached", "directly connected", "directly coupled" or "directly contacting" another element, there will be no intermediate elements.

[0040] On the one hand, the embodiment of the present application provides a locking device 1, please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 The structure of the locking device 1 is shown in its entirety and in part, respectively, and includes a suction cup 10, a locking assembly and a seat body 30. One side of the suction cup 10 is rotatably connected to the locking assembly. The suction cup 10 is further provided with a seat body 30 on the same side of the locking assembly. The locking assembly is arranged through the seat body 30 at one end away from the suction cup 10.

[0041] When the locking assembly is in a locked state, the seat body 30 is pressed and held on the suction cup 10 by the locking assembly;

[0042] When the lock assembly is in the unlocked state, the seat body 30 and the suction cup are separated by the lock assembly 10;

[0043] Different from the prior art, the connection between the locking assembly and the suction cup 10 is located between the pressing surface of the seat body 30 by the locking assembly and the suction cup 10, that is, the locking assembly does not pass through the side of the seat body 30 and is rotatably connected to the suction cup 10, so that the seat body 30 can rotate relative to the suction cup 10 together with the locking assembly (mainly the shaft 20).

[0044] A locking assembly includes a shaft body 20, a buckle 60 and an elastic body 40, one end of the shaft body 20 is rotatably connected to the suction cup 10, and the other end is hinged to the buckle 60; the elastic body 40 is elastic and is arranged between the seat body 30 and the suction cup 10, and the elastic body 40 keeps the seat body 30 away from the suction cup 10 without external force;

[0045] The distance from the rotation center of the buckle 60 to the contact surface between the buckle 60 and the seat body 30 is greater in the locked state than in the unlocked state.

[0046] In one possible implementation, at least one limiting end face 22 is provided on the outer periphery of the shaft body 20, and the outer contour of the shaft body 20 is adapted to the limiting hole 32 on the seat body 30, and the limiting end face 22 constrains the freedom of the seat body 30 in the circumferential direction of the shaft body 20; the limiting end face 22 is not limited to the tangent plane on the outer periphery of the cylindrical shaft body 20, and can also be a convex surface on the outer periphery of the shaft body 20, or a non-cylindrical shaft body 20.

[0047] See also Figure 3 , Figure 3 A partial cross-sectional view of the locking device 1 excluding the suction cup 10 is shown. In a possible implementation, a supporting portion 61 is provided at one end of the buckle 60, and the supporting portion 61 is hinged to one end of the shaft body 20 passing through the seat body 30 through the shaft rod 201. When the locking assembly is in a locked state, the first surface of the supporting portion 61 abuts against the seat body 30; when the locking assembly is in an unlocked state, the second surface of the supporting portion 61 abuts against the seat body 30; the distance from the first surface of the supporting portion 61 to the axis center of the shaft rod 201 is greater than the distance from the second surface of the supporting portion 61 to the axis center of the shaft rod 201.

[0048] In a possible implementation, the elastic body 40 is a spring, and the spring is sleeved on the outer periphery of the shaft body 20 .

[0049] In order to obtain a more stable locking effect, the suction cup 10 is provided with an outer tooth portion 12 on the side connected to the shaft body 20, and the seat body 30 is provided with an inner tooth portion 311 matching the outer tooth portion 12 on the side facing the suction cup 10. When the lock assembly is in the locked state, the outer tooth portion 12 is meshed with the inner tooth portion 311, thereby limiting the rotation of the shaft body 20 relative to the suction cup 10.

[0050] In a possible implementation, an annular inner wall 31 is provided inside the seat body 30 above the outer tooth portion 12, and an inner tooth portion 311 is provided on the bottom surface of the inner wall 31, and both the outer tooth portion 12 and the inner tooth portion 311 are annular tooth groove structures. The inner wall 31 enables the hollow seat body 30 to contact the center of the suction cup 10, and allows the elastic body 40 (such as a spring) to be sleeved in the inner wall 31, thereby restricting the axial displacement of the spring.

[0051] In order to improve the customer experience, a suction cup 10 manufactured by a two-component injection molding process includes a main part 11, a soft rubber part 111 and a shaft end 13. The main part 11 is disc-shaped, and the soft rubber part 111 is arranged on its outer periphery. The shaft end 13 is arranged on a side of the main part 11 facing the shaft body 20, wherein the material hardness of the shaft end 13 and the main part 11 is higher than the material hardness of the soft rubber part 111.

[0052] In a possible implementation, the shaft end 13 is a rotating body arranged along the normal direction of the adsorption surface of the suction cup 10, and the shaft end 13 is axially connected to the shaft body 20, allowing the shaft body 20 to rotate circumferentially but limiting its axial movement.

[0053] Furthermore, the shaft end 13 is a cylinder, and the outer end face of the shaft end 13 is a flange 131 with a larger diameter, and the flange 131 is also a cylinder; a first cavity 21 adapted to the shaft end 13 is provided at the bottom of the shaft body 20, and the inner edge of the bottom of the shaft body 20 abuts against the flange 131 on the side facing the suction cup 10.

[0054] See also Figure 4 , Figure 4 The partial structure of the connection between the buckle 60 and the shaft body 20 in the locking device 1 is shown. A flat table 33 is provided on both sides of the shaft body 20 at the top of the base body 30 for contacting the buckle 60. Specifically, when the locking assembly is in a locked state, the first abutting surface of the abutting portion 61 on the buckle 60 abuts against the table 33; when the locking assembly is in an unlocked state, the second abutting surface of the abutting portion 61 on the buckle 60 abuts against the table 33.

[0055] A limiting plate 331 is vertically provided on the table 33 outside the abutting portion 61 to limit the movement of the buckle 60 in the axial direction of the shaft 201 .

[0056] In a possible implementation, a surface of the seat body 30 that contacts the suction cup 10 is an annular surface, and the annular surface matches the soft rubber portion 111 on the suction cup 10 in size.

[0057] In order to enhance the aesthetics of the locking device 1 , a cover body 50 is provided on the top of the base body 30 , and a hinge seat 51 for hinged connection with the cantilever device 2 is provided on one side of the cover body 50 .

[0058] In another possible implementation, the hinge seat 51 may also be disposed on one side of the seat body 30 .

[0059] In a second aspect, an embodiment of the present application provides a terminal bracket, see Figure 4 and Figure 5 , Figure 4 and Figure 5 The structures of the terminal bracket and the cantilever device 2 are shown from different angles. The cantilever device 2 includes a rotating arm 70 and a sliding arm 80. The rotating arm 70 is connected to the locking device 1 through a hinge, and the sliding arm 80 can slide along the extension direction of the rotating arm 70.

[0060] In a possible implementation, a slideway 71 is provided in the rotating arm 70, and a slide rail 72 is provided on at least one side wall of the slideway 71; the outer contour of the sliding arm 80 is adapted to the slideway 71 of the rotating arm 70, and a slide groove 81 is provided on the surface of the sliding arm 80 adjacent to the slide rail 72. To increase the comfort of use, the rotating arm 70 is arc-shaped in the extension direction.

[0061] In a possible implementation, a connecting end 90 is provided on the free end of the sliding arm 80 . The connecting end 90 may be spherical, flat, or clip-shaped. The connecting end 90 may be directly / indirectly connected to the mobile terminal.

[0062] In a possible implementation, the rotating arm 70 is hinged to the locking device 1 through a first fastener 73. The first fastener 73 includes a long screw and a first nut. The clamping force of the rotating arm 70 on the hinge seat 51 of the locking device 1 is adjusted by adjusting the position of the first nut relative to the long screw.

[0063] In one possible implementation, the rotating arm 70 adjusts the clamping state of the sliding arm 80 through the second fastener 74, and the second fastener 74 includes a second nut and a short screw, and the short screw is arranged on the side of the sliding arm 80; when the second nut is locked, the short screw is pressed against the sliding arm 80, and when the second nut is loosened, the short screw moves away from the sliding arm 80.

[0064] Instructions for use:

[0065] When the locking device 1 is in a locked state, the first surface of the abutting portion 61 on the buckle 60 is pressed against the table surface 33 of the seat body 30, the seat body 30 moves axially along the shaft body 20, the elastic body 40 is compressed, and the seat body 30 is pressed against the suction cup 10;

[0066] When the lock device 1 is in the unlocked state, the buckle 60 is rotated so that the second surface of the abutment portion 61 on the buckle 60 is pressed against the table surface 33 of the seat body 30. Under the action of the restoring force of the elastic body 40, the seat body 30 moves axially along the shaft body 20, and the seat body 30 is away from the suction cup 10. In this state, the seat body 30 is rotated so that the seat body 30 and the shaft body 20 rotate around the normal direction of the suction surface of the suction cup 10. The rotation of the seat body 30 drives the cantilever device 2 and the mobile terminal to rotate, thereby adjusting the position of the mobile terminal.

[0067] It should be particularly noted that in the prior art (for example, authorization announcement No. CN216768867U), the shaft end at the top of the suction cup is columnar and extends upward through the top surface of the seat body. The shaft end is rotatably connected to a connecting piece, and the connecting piece is connected to the seat body through a rotating shaft, that is, the rotating connection between the seat body and the suction cup is at the top of the seat body, while in the technical solution of the present application, the rotating connection between the seat body 30 and the suction cup 10 is at the bottom of the seat body 30. In the present technical solution, the entire outer surface of the shaft body 20 is in contact with the seat body 30, and the contact area is much larger than the contact surface between the rotating shaft and the seat body in the prior art, and the structure is more stable and not easy to be damaged.

[0068] Although the exemplary embodiments of the present application have been described, it should be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present application without departing from the spirit and scope of the present application in essence. Therefore, all changes and modifications are included in the protection scope of the present application as defined by the claims. The present application is defined by the attached claims, and the equivalents of these claims are also included.

Claims

1. A locking device (1), comprising a suction cup (10), a locking assembly and a seat (30), wherein one side of the suction cup (10) is rotatably connected to the locking assembly, the suction cup (10) is further provided with a seat (30) on the same side of the locking assembly, and an end of the locking assembly away from the suction cup (10) is arranged through the seat (30), When the locking assembly is in a locked state, the seat body (30) is pressed and held on the suction cup (10) by the locking assembly; When the locking assembly is in the unlocked state, the seat body (30) and the suction cup (10) are separated by the locking assembly; It is characterized in that The connection between the locking assembly and the suction cup (10) is located between the pressing surface of the seat body (30) held by the locking assembly and the suction cup (10).

2. The locking device (1) according to claim 1, characterized in that: The locking assembly comprises an axle (20), a buckle (60) and an elastic body (40); one end of the axle (20) is rotatably connected to the suction cup (10), and the other end is hinged to the buckle (60); the elastic body (40) is elastic and is arranged between the seat body (30) and the suction cup (10); in the absence of external force, the elastic body (40) keeps the seat body (30) away from the suction cup (10); the distance from the rotation center of the buckle (60) to the contact surface between the buckle (60) and the seat body (30) is greater in the locked state than in the unlocked state.

3. The locking device (1) according to claim 2, characterized in that: At least one limiting end surface (22) is provided on the outer periphery of the shaft body (20), the outer contour of the shaft body (20) is adapted to the limiting hole (32) on the seat body (30), and the limiting end surface (22) constrains the degree of freedom of the seat body (30) in the circumferential direction of the shaft body (20).

4. The locking device (1) according to claim 2, characterized in that: One end of the buckle (60) is provided with a supporting portion (61), and the supporting portion (61) is hingedly connected to one end of the shaft body (20) passing through the seat body (30) through the shaft rod (201); When the locking assembly is in a locked state, the first surface of the abutting portion (61) abuts against the seat body (30); When the lock assembly is in the unlocked state, the second surface of the abutment portion (61) abuts against the seat body (30); The distance from the first surface of the abutting portion (61) to the axis center of the shaft rod (201) is greater than the distance from the second surface of the abutting portion (61) to the axis center of the shaft rod (201).

5. The locking device (1) according to claim 2, characterized in that: The suction cup (10) is provided with an external tooth portion (12) on a side connected to the shaft body (20), and the seat body (30) is provided with an internal tooth portion (311) matching the external tooth portion (12) on a side facing the suction cup (10); when the locking assembly is in a locked state, the external tooth portion (12) and the internal tooth portion (311) are locked to limit the rotation of the shaft body (20) relative to the suction cup (10).

6. The locking device (1) according to claim 2, characterized in that: A rotational body-shaped shaft end (13) is provided in the normal direction of the suction surface of the suction cup (10), and the shaft end (13) is axially connected to the shaft body (20), allowing the shaft body (20) to rotate in the circumferential direction but limiting its axial movement.

7. The locking device (1) according to claim 2, characterized in that: An annular inner wall (31) is provided inside the seat body (30) above the outer tooth portion (12); an inner tooth portion (311) is provided on the bottom surface of the inner wall (31); both the outer tooth portion (12) and the inner tooth portion (311) are annular tooth groove structures; and the elastic body (40) is sleeved in the inner wall (31).

8. The locking device (1) according to claim 2, characterized in that: The suction cup (10) comprises a main part (11), a soft rubber part (111) and an axial end part (13); the main part (11) is disc-shaped and has a soft rubber part (111) arranged on its outer periphery; the axial end part (13) is arranged on a side of the main part (11) facing the shaft body (20); and the material hardness of the axial end part (13) and the main part (11) is higher than the material hardness of the soft rubber part (111).

9. A terminal bracket, characterized in that: The invention comprises a locking device (1) and a cantilever device (2) as claimed in any one of claims 1 to 8, wherein the cantilever device (2) comprises a rotating arm (70) and a sliding arm (80), wherein the rotating arm (70) is hingedly connected to the locking device (1), and the sliding arm (80) can slide along the extension direction of the rotating arm (70).

10. The terminal bracket according to claim 9, characterized in that: The rotating arm (70) is hinged to the locking device (1) via a first fastener (73), wherein the first fastener (73) comprises a long screw and a first nut, and the clamping force of the rotating arm (70) on the hinge seat (51) in the locking device (1) is adjusted by adjusting the position of the first nut relative to the long screw; The rotating arm (70) adjusts the clamping state of the sliding arm (80) through the second fastener (74), the second fastener (74) comprising a second nut and a short screw, the short screw being arranged on the side of the rotating arm (70); when the second nut is tightened, the short screw is pressed against the sliding arm (80), and when the second nut is unscrewed, the short screw moves away from the sliding arm (80).

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