Tail box cover of pickup truck

By adding slidable locking parts and clamping seats to the track of the pickup truck trunk cover, combined with the design of the press rod, the problem of cumbersome and loose fixing steps of the existing pickup truck trunk cover is solved, achieving a fast and stable fixing effect.

CN119611018APending Publication Date: 2025-03-14WENZHOU XIAOLEI AUTOMOTIVE PARTS CO LTD
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Patent Information

Application Number
CN202411680193.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2025-03-14

AI Technical Summary

Technical Problem

The fixing steps of existing pickup truck trunk covers are cumbersome in the tiled state and are easily loosened during driving.

Method used

A pickup truck trunk cover consisting of a combination body and a leather covering above the combination body is designed, and it is fixed on the track using a sliding locking member, and a fast and stable fixation is achieved through the cooperation of the clamping seat and the pressing rod.

Benefits of technology

The fixing steps are greatly reduced, and the fixing effect is good and the operation is simple, avoiding the problem of loosening during driving.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a trunk cover of a pickup truck, relates to the technical field of automobile parts, and aims to solve the technical problem that the trunk cover of the pickup truck in a tiled state is tedious in fixing step. The pickup truck trunk cover further comprises rails, at least one rail is arranged at the position, facing a trunk of the pickup truck, of the at least one frame assembly, and the rails are provided with sliding grooves. The locking piece comprises a rod seat which is in sliding connection with the sliding groove and is internally provided with a channel; the guide rod is provided with a head part and a rod body; the clamping seat is composed of a transverse plate and lug plates on the two sides, and guide blocks are arranged on the sides, close to each other, of the two lug plates; according to the pickup truck trunk cover provided by the embodiment of the invention, the slideable locking piece is additionally arranged on the track, so that when the pickup truck trunk cover is fixed, the clamping piece is only required to abut against the lower edge of the pickup truck trunk, the pressing rod is rotated clockwise, and the eccentric seat pushes the clamping plate of the clamping seat to move towards a truck body; the trunk cover of the pickup truck is fixed on the trunk of the pickup truck, so that the fixing steps are greatly reduced.
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Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, in particular to a tail box cover of a pickup truck. Background Art

[0002] As a common vehicle type, pickup trucks have the comfort of sedans while being powerful. As pickup trucks have strong cargo carrying capacity and the ability to adapt to bad roads, their comprehensive performance also makes them one of the common off-road vehicles nowadays. In order to enable pickup trucks to adapt to more diverse environments, most existing pickup trucks need to be equipped with a hood, which is composed of multiple panels. When in use, the hood is folded, and when not in use, it is laid flat to cover the rear trunk of the pickup truck;

[0003] In the process of achieving the above-mentioned flattening and folding, the inventors found that the tailgate of a pickup truck in a flattened state is prone to loosen during the driving of the vehicle. If it is to be fixed, the existing fixing steps are cumbersome. Summary of the invention

[0004] An embodiment of the present invention provides a pickup truck trunk cover to at least solve the technical problem of complicated steps in fixing the pickup truck trunk cover in a flat state.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] A pickup truck trunk cover is used in a pickup truck to cover or open the trunk of the pickup truck. The pickup truck trunk cover is composed of a combination and a leather covering the combination. The combination is formed by splicing a plurality of frame components. Adjacent frame components are rotatably connected. Each frame component is surrounded by a plurality of frames. The pickup truck trunk cover also includes:

[0007] Tracks, at least one track is arranged at a position of at least one frame assembly facing the tail box of the pickup truck, and the track has a slide groove;

[0008] Locking parts, including:

[0009] A rod seat is slidably connected with the slide groove and has a channel inside;

[0010] A guide rod having a head and a rod body, wherein the head is slidably connected to the channel;

[0011] The clamping seat is composed of a horizontal plate and ear plates on both sides. A clamping plate is arranged on one side in a direction perpendicular to the upper surface of the horizontal plate, and a guide hole is provided on the other side. The rod body is plugged into the guide hole. Guide blocks are arranged on the sides of the two ear plates close to each other.

[0012] The pressure rod has an eccentric seat and a handle, and extends outward along the edge positions of both sides of the eccentric seat to form a blocking edge. A rotating shaft is rotatably connected at the eccentric position of the eccentric seat, and a through hole is provided along the radial direction of the rotating shaft to fix the rod body of the guide rod;

[0013] Among them, the pressure rod is adjusted to a horizontal state, and the rod seat is slid toward the lower edge of the pickup truck's trunk until the clamping plate abuts against the lower edge of the pickup truck's trunk. The pressure rod is rotated clockwise, the eccentric seat rotates along the outer wall of the rotating shaft, and the retaining edge slides along the guide block. The eccentric seat pushes the clamping plate of the clamping seat toward the direction close to the vehicle body, thereby fixing the pickup truck's trunk cover to the trunk of the pickup truck.

[0014] The pickup truck trunk cover provided by the embodiment of the present invention has a slidable locking part added on the track to enable it to move in a direction closer to or away from the pickup truck trunk. When fixing it, it is only necessary to make the clamp abut against the lower edge of the pickup truck trunk and rotate the pressure rod clockwise. The eccentric seat pushes the clamping seat to move in a direction close to the vehicle body, thereby fixing the pickup truck trunk cover to the trunk of the pickup truck. The fixing steps are greatly reduced and the fixing effect is good. When folding it, it is only necessary to rotate the pressure rod counterclockwise to separate the clamping seat from the trunk of the pickup truck. The operation is simple.

[0015] Furthermore, both ends of the track are provided with end caps, and a stopper is slidably connected in the track, a moving path is formed between the stopper and the end cap, and the rod seat is located on the moving path; the frame assembly is surrounded by at least three frames and forms a U-shaped shape, the track is arranged parallel to two of the frames, and perpendicular to the other two frames, and the end cap can move in the other two frames. This arrangement limits the sliding path of the rod seat to prevent its position from being offset, and the setting of the end cap can adjust the position of the track.

[0016] Furthermore, a slot is provided on the inner wall of the channel, and a male plug is inserted into the slot. This arrangement limits the movement track of the guide rod and prevents the guide rod from being separated from the channel.

[0017] Furthermore, a through slot is provided on one side of the rod seat and communicates with the passage. With such arrangement, the guide rod can swing along the inner wall of the through slot, thereby changing the angle of the guide rod, which is convenient for the storage of the guide rod.

[0018] Furthermore, guide blocks are formed by extending outward along both sides of the through slot. Such arrangement guides and limits the guide rod.

[0019] Further, the head of the guide rod is cylindrical or semi-cylindrical or hexagonal or square or plum blossom-shaped. In this way, the shape of the guide rod head can be specifically set according to demand.

[0020] Furthermore, a limit groove and a limit block are respectively provided on the contact surface between the clamping seat and the pressure rod, and the limit block matches the limit groove. In this way, the relative rotation angle between the pressure rod and the clamping seat is limited to prevent transition displacement, loosening, and reducing the fixing effect.

[0021] Furthermore, the pickup truck trunk cover is folded from the rear to the front of the vehicle to form a folded pickup truck trunk cover, and a fixing assembly is arranged between the bending part facing the front of the vehicle and the bottom of the trunk, and the fixing assembly includes a positioning block, a webbing, a male plug and a socket, the positioning block has a fixing hole, one end of the webbing is passed through and fixed in the fixing hole, and the other end is passed through and fixed in the male plug, and the male plug and the socket are inserted and fixed together. In this way, the pickup truck trunk cover in the folded state is fixed to prevent it from folding during driving or in windy weather.

[0022] Furthermore, a corner piece is arranged at the corner of the pickup truck trunk cover, the corner piece includes a transfer block and a gasket, a hole is opened in the transfer block, the leather is fixed to the hole by screws, the screws pass through the gasket, the gasket and the leather are fixed to the transfer block, and an elastomer is arranged outside the gasket.

[0023] Furthermore, an anti-slip assembly is provided between the pickup truck tail box cover and the pickup truck body, and the anti-slip assembly includes:

[0024] A first clip and a second clip are located on the left and right sides of the vehicle body, and the first clip is rotatably connected to the second clip, and a hole is formed on the upper surface of the second clip;

[0025] A fastener and a nut, wherein the fastener passes through the second clamp and the first clamp and is threadedly connected with the nut;

[0026] A slider, slidably connected to the frame;

[0027] The strap has one end sleeved on the slider and the other end provided with a collar, which is connected to the hole through an anti-slip ring. With this arrangement, a reinforced insurance is added between the pickup truck tail box cover and the vehicle body to prevent the pickup truck tail box cover from being separated from the vehicle body in extreme cases. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of a pickup truck trunk lid in a flat state from a first viewing angle according to an embodiment of the present invention;

[0029] Figure 2 This is a three-dimensional schematic diagram of a locking member according to an embodiment of the present invention;

[0030] Figure 3 This is an exploded view of a locking member according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a rod base according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a guide rod according to an embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of another embodiment of a guide rod;

[0034] Figure 7 is a schematic diagram of yet another embodiment of a guide rod;

[0035] Figure 8 is a schematic diagram of another embodiment of a guide rod;

[0036] Fig. 9 A schematic diagram of a clamping seat from a first viewing angle according to an embodiment of the present invention;

[0037] Fig.10 A schematic diagram of a clamping base from a second viewing angle according to an embodiment of the present invention;

[0038] Fig.11 A schematic diagram of a pressure rod according to an embodiment of the present invention;

[0039] Fig.12 It is an assembly diagram of a pressure rod and a clamping seat according to an embodiment of the present invention;

[0040] Fig.13 This is a folding state diagram of an embodiment of the present invention;

[0041] Fig.14 is a schematic diagram of a fixing assembly according to an embodiment of the present invention;

[0042] Fig.15 It is a schematic diagram of a pickup truck trunk lid in a flat state from a second viewing angle according to an embodiment of the present invention;

[0043] Fig.16 for Fig.15 Enlarged view of point A in the middle;

[0044] Fig.17 for Fig.16 Perspective view of the middle gasket;

[0045] Fig.18 This is a diagram of the assembly of a pickup truck trunk cover and a pickup truck body (partial) according to an embodiment of the present invention;

[0046] Fig.19 This is a schematic diagram of the connection between the pickup truck tail box cover and the pickup truck body (partial) according to an embodiment of the present invention;

[0047] Fig. 20 This is a schematic diagram of the anti-slip assembly according to an embodiment of the present invention from a first viewing angle;

[0048] Fig.21 It is a schematic diagram from a second viewing angle of the anti-slip assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present disclosure, unless otherwise specified, directional terms such as "axial", "circumferential", and "radial" are generally defined relative to the rotation axis of the rotor in the drive motor, and "inner" and "outer" refer to the inside and outside of the corresponding component contours. The use of terms such as "first", "second", etc. is intended to distinguish different components and does not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements.

[0053] This application discloses a pickup truck trunk cover, which is applied to a pickup truck to cover or open the trunk of the pickup truck. Figure 1 The pickup truck trunk cover is composed of a combination and a cover 1 covering the combination. The combination is composed of a plurality of frame components. Adjacent frame components are rotatably connected. Each frame component is surrounded by a plurality of frames 2. The pickup truck trunk cover also includes:

[0054] See also Figure 2 , track 3, at least one track 3 is arranged at a position of at least one frame assembly facing the tail box of the pickup truck, and the track 3 has a slide groove 31;

[0055] See also Figure 3 , the locking member 4 is specifically illustrated by way of example, including:

[0056] See also Figure 4, the rod seat 41 is specifically illustrated, which is slidably connected with the slide groove 31 and has a channel 411 inside;

[0057] See also Figure 3 , the guide rod 42 is specifically illustrated as comprising a head 421 and a rod body 422, and the head 421 is slidably connected to the channel 411;

[0058] See also Fig. 9 and Fig.10 , the clamping seat 43 is specifically described by an example, which is composed of a horizontal plate 431 and ear plates 432 on both sides. The clamping plate 433 is arranged on one side in a direction perpendicular to the upper surface of the horizontal plate 431, and a guide hole 434 is opened on the other side. The rod body 422 is plugged into the guide hole 434, and guide blocks 435 are arranged on the sides of the two ear plates 432 close to each other;

[0059] See also Fig.11 , the pressure rod 44 is specifically described by way of example, and has an eccentric seat 441 and a handle 442, and a retaining edge 443 is formed by extending outward along the edge positions of both sides of the eccentric seat 441, and a rotating shaft 444 is rotatably connected at the eccentric position of the eccentric seat 441, and a through hole 445 is provided along the radial direction of the rotating shaft 444 to fix the rod body 422 of the guide rod 42;

[0060] See also Fig.12 , wherein the pressure rod 44 is adjusted to a horizontal state, and the rod seat 41 is slid toward the lower edge of the pickup truck's trunk until the clamping plate 433 abuts against the lower edge of the pickup truck's trunk, the pressure rod 44 is rotated clockwise, the eccentric seat 441 rotates along the outer wall of the rotating shaft 444, the retaining edge 443 slides along the guide block 435, and the eccentric seat 441 pushes the clamping plate 433 of the clamping seat 43 to move toward the direction close to the vehicle body, thereby fixing the pickup truck's trunk cover to the trunk of the pickup truck.

[0061] The pickup truck trunk cover provided by the embodiment of the present invention has a slidable locking part added on the track to enable it to move in a direction closer to or away from the pickup truck trunk. When fixing it, it is only necessary to make the clamp abut against the lower edge of the pickup truck trunk and rotate the pressure rod clockwise. The eccentric seat pushes the clamping seat to move in a direction close to the vehicle body, thereby fixing the pickup truck trunk cover to the trunk of the pickup truck. The fixing steps are greatly reduced and the fixing effect is good. When folding it, it is only necessary to rotate the pressure rod counterclockwise to separate the clamping seat from the trunk of the pickup truck. The operation is simple.

[0062] Please continue to see Figure 2, In order to define the sliding path of the rod base 41, end caps 32 are provided at both ends of the track 3. A stop block 33 is slidably connected within the track 3, and a moving path is formed between the stop block 33 and the end cap 32. The rod base 41 is located on the moving path; the frame assembly is formed by enclosing at least three side frames 2 and forms a C-shaped structure. The track 3 is arranged parallel to one of the side frames 2 and perpendicular to the other two side frames 2, and the end cap 32 can move within the other two side frames 2. This defines the sliding path of the rod base 41 and prevents its position from shifting. The setting of the end cap 32 can adjust the position of the track 3.

[0063] Please continue to refer to Figure 4 , In order to prevent the guiding rod 42 from separating from the channel 411, a clamping groove 412 is formed on the inner wall of the channel 411, and a male end plug 413 is inserted into the clamping groove 412. This defines the movement trajectory of the guiding rod 42 and prevents the guiding rod 42 from separating from the channel 411.

[0064] Please continue to refer to Figure 4 , A through groove 414 is formed on one side of the rod base 41 and is communicated with the channel 411. The guiding rod 42 can swing along the inner wall of the through groove 414, thereby changing the angle of the guiding rod 42, which is convenient for the storage of the guiding rod 42.

[0065] Please continue to refer to Figure 4 , Guide blocks 415 extend outward along both sides of the through groove 414 to guide and limit the guiding rod 42.

[0066] Please refer to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , The head 421 of the guiding rod 42 is cylindrical or semi-cylindrical or hexagonal head-shaped or square-shaped or plum blossom-shaped. The shape of the head of the guiding rod 42 can be specifically set according to requirements.

[0067] Please refer to Fig.10 and Fig.11 , Limit grooves 436 and limit blocks 446 are respectively provided on the surfaces where the clamping seat 43 and the pressing rod 44 are in contact with each other. The limit block 446 matches the limit groove 436. This limits the relative rotation angle between the pressing rod 44 and the clamping seat 42, prevents excessive displacement from occurring, and avoids loosening, thereby reducing the fixing effect.

[0068] Please refer to Fig.13 and Fig.14In order to fix the pickup truck trunk cover in a folded state, the pickup truck trunk cover is folded from the rear of the vehicle to the front of the vehicle to form the pickup truck trunk cover in a folded state. A fixing assembly 5 is arranged between the bending part facing the front of the vehicle and the bottom of the pickup truck 1. The fixing assembly 5 includes a positioning block 51, a webbing 52, a male plug 53 and a socket 54. The positioning block 51 has a fixing hole 511. One end of the webbing 52 is fixed in the fixing hole 511, and the other end is fixed in the male plug 53. The male plug 53 and the socket 54 are inserted and fixed together. The pickup truck trunk cover in a folded state is fixed to prevent it from folding during driving or in windy weather.

[0069] See also Fig.15 , Fig.16 and Fig.17 A corner piece 6 is provided at the corner of the pickup truck trunk cover, a hole 621 is provided in the adapter block 62, the pickup 1 is fixed to the hole 621 by a screw 622, the screw 622 passes through the gasket 61, and the gasket 61 and the pickup 1 are fixed to the adapter block 62, and an elastomer is provided outside the gasket 61, which can be a rubber pad.

[0070] See also Figure 18-Figure 21 An anti-slip assembly 8 is provided between the pickup truck tail box cover and the pickup truck body 7, and the anti-slip assembly 8 includes: a first clip 85 and a second clip 84 located on the left and right sides of the body 7, and the first clip 85 is rotatably connected with the second clip 84, and a hole is provided on the upper surface of the second clip 84; a fastener 87 and a nut 86, and the fastener 87 passes through the second clip 84 and the first clip 85 and is threadedly connected with the nut 86;

[0071] The slider 81 is slidably connected to the frame 2; the strap 82 has one end sleeved on the slider 81 and the other end provided with a collar 821, and the collar 821 is connected to the hole through an anti-slip ring 83. A reinforced insurance is added between the pickup truck trunk cover and the vehicle body to prevent the pickup truck trunk cover from being separated from the vehicle body in extreme cases.

[0072] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pickup truck trunk cover, used in a pickup truck, for covering or opening the trunk of the pickup truck, the pickup truck trunk cover is composed of a combination and a cover (1) covering the combination, the combination is composed of a plurality of frame components, adjacent frame components are rotatably connected, each frame component is surrounded by a plurality of frames (2), and is characterized in that: The pickup truck tailgate also includes: A track (3), at least one of the tracks (3) being arranged at a position of at least one of the frame components facing the tail box of the pickup truck, and the track (3) having a slide groove (31); The locking member (4) comprises: A rod seat (41) is slidably connected to the slide groove (31) and has a channel (411) inside; A guide rod (42) having a head (421) and a rod body (422), wherein the head (421) is slidably connected to the channel (411); The clamping seat (43) is composed of a horizontal plate (431) and ear plates (432) on both sides. The clamping plate (433) is arranged on one side in a direction perpendicular to the upper surface of the horizontal plate (431), and a guide hole (434) is provided on the other side. The rod body (422) is plugged into the guide hole (434), and guide blocks (435) are arranged on the sides of the two ear plates (432) close to each other. A pressure rod (44) having an eccentric seat (441) and a handle (442), extending outward along the edge positions on both sides of the eccentric seat (441) to form a blocking edge (443), a rotating shaft (444) rotatably connected at the eccentric position of the eccentric seat (441), a through hole (445) is provided along the radial direction of the rotating shaft (444) to fix the rod body (422) of the guide rod (42); The pressure rod (44) is adjusted to a horizontal state, and the rod seat (41) is slid toward the lower edge of the pickup truck's trunk until the clamping plate (433) abuts against the lower edge of the pickup truck's trunk. The pressure rod (44) is rotated clockwise, and the eccentric seat (441) rotates along the outer wall of the rotating shaft (444). The retaining edge (443) slides along the guide block (435). The eccentric seat (441) pushes the clamping plate (433) of the clamping seat (43) to move toward the vehicle body, thereby fixing the pickup truck's trunk cover to the trunk of the pickup truck.

2. The pickup truck trunk cover according to claim 1, characterized in that: Both ends of the track (3) are provided with end covers (32), a stopper (33) is slidably connected inside the track (3), a moving path is formed between the stopper (33) and the end cover (32), and the rod seat (41) is located on the moving path; The frame assembly is surrounded by at least three frames (2) to form a U-shape, the track (3) is arranged parallel to one of the frames (2) and perpendicular to the other two frames (2), and the end cover (32) can move within the other two frames (2).

3. The pickup truck trunk cover according to claim 1, characterized in that: A card slot (412) is provided on the inner wall of the channel (411), and a male end plug (413) is inserted into the card slot (412).

4. The pickup truck trunk cover according to claim 3, characterized in that: A through groove (414) is provided on one side of the rod seat (41) and is communicated with the channel (411).

5. The pickup truck trunk cover according to claim 4, characterized in that: Guide blocks (415) are formed by extending outwards along both sides of the through slot (414).

6. The pickup truck trunk cover according to claim 1, characterized in that: The head (421) of the guide rod (42) is cylindrical, semi-cylindrical, hexagonal, square or plum blossom-shaped.

7. The pickup truck trunk cover according to claim 1, characterized in that: A limiting groove (436) and a limiting block (446) are respectively provided on the surfaces where the clamping seat (43) and the pressing rod (44) contact each other, and the limiting block (446) matches the limiting groove (436).

8. The pickup truck trunk cover according to claim 1, characterized in that: The pickup truck trunk lid is folded along the rear end of the vehicle toward the front end to form a folded pickup truck trunk lid, and a fixing component (5) is arranged between the bending part toward the front end of the vehicle and the leather (1) at the bottom, and the fixing component (5) includes a positioning block (51), a webbing (52), a male plug (53) and a socket (54), the positioning block (51) has a fixing hole (511), one end of the webbing (52) is inserted and fixed to the fixing hole (511), and the other end is inserted and fixed to the male plug (53), and the male plug (53) and the socket (54) are inserted and fixed together.

9. The pickup truck trunk cover according to claim 1, characterized in that: A corner piece (6) is arranged at the corner of the pickup truck trunk cover, and the corner piece (6) includes a transfer block (62) and a gasket (61). A hole (621) is provided in the transfer block (62), and the leather (1) is fixed to the hole (621) by means of a screw (622). The screw (622) passes through the gasket (61) to fix the gasket (61) and the leather (1) to the transfer block (62), and an elastic body is arranged outside the gasket (61).

10. The pickup truck trunk cover according to claim 1, characterized in that: An anti-slip assembly (8) is arranged between the pickup truck tail box cover and the pickup truck body (7), and the anti-slip assembly (8) comprises: A first clamp (85) and a second clamp (84) are located on the left and right sides of the vehicle body (7), and the first clamp (85) is rotatably connected to the second clamp (84), and a hole is provided on the upper surface of the second clamp (84); a fastener (87) and a nut (86), wherein the fastener (87) passes through the second clamp (84) and the first clamp (85) and is threadedly connected to the nut (86); A slider (81) slidably connected to the frame (2); A binding belt (82), one end of which is sleeved on the slider (81), and the other end of which is provided with a collar (821), wherein the collar (821) is connected to the hole via an anti-slip ring (83).