Multi-angle self-locking folding beach chair storage table hinge

Abstract

The utility model provides a multi-angle self-locking folding beach chair storage table hinge, and belongs to the technical field of mechanical connection. Comprising a first hinge, a second hinge, a damping rod and a connecting shaft, two connecting blocks are symmetrically fixed to one end of the first hinge, two mounting blocks are symmetrically fixed to one end of the second hinge, through holes for clamping and embedding of the damping rod are formed in the connecting blocks, a round hole penetrating through a body of the damping rod is formed in the axial center of the damping rod, and a protruding block is arranged on the outer wall of the damping rod. And one end of the connecting shaft is fixedly connected with the mounting block to realize axial fixation, and the other end of the connecting shaft extends into the circular hole to form running fit. Through the cooperation of the damping rod and the connecting shaft, stepless adjustment and self-locking fixation of the hinge unfolding angle are achieved, and the stability of the storage table at different angles is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical connection technology and relates to a multi-angle self-locking folding beach chair storage hinge. Background Technology

[0002] A beach chair is a portable outdoor leisure device based on a folding structure. Its core design goals are lightweight design, quick storage, and environmental adaptability. It is widely used in beach and camping settings. To enhance the user experience, modern beach chairs typically feature an adjustable storage shelf, which is dynamically connected to the chair body via a hinge mechanism, balancing functional expansion with space utilization.

[0003] Existing patent document CN119466471A discloses a dual-axis buffer hinge, comprising: a fixed hinge; a movable hinge rotatably connected to the fixed hinge; a rotating sleeve fixedly connected to the movable hinge; a cam fixedly connected to the fixed hinge; a hydraulic cylinder fixedly connected to the cam; a first positioning pin fixedly connected to the drive end of the hydraulic cylinder; and a slide groove formed on the cam. The first positioning pin matches the slide groove on the cam. A spring sleeve is fixedly connected to the fixed hinge, a compression spring is fixedly connected to the spring sleeve, and a second positioning pin is fixedly connected to the compression spring, the second positioning pin matching the slide groove on the cam.

[0004] However, the aforementioned existing technologies still have the following problems:

[0005] While existing hinge technology improves rotational smoothness through hydraulic damping and spring return, it is limited by its single-degree-of-freedom design and cannot meet the dynamic locking requirements of beach chair storage shelves. Specifically:

[0006] Locking failure: After the movable swing blade rotates, it relies on the spring rebound force to maintain its position. Under external interference, it is easy to deviate from the target angle.

[0007] Limited adjustment: The mechanical cooperation between the slide and the positioning pin results in discrete angle adjustment, making it difficult to achieve continuous stepless locking. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-angle self-locking hinge for the storage table of a folding beach chair to solve the problems mentioned in the background technology. This utility model can realize continuous multi-angle adjustment of the movable hinge and self-locking.

[0009] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0010] A multi-angle self-locking folding beach chair storage hinge includes:

[0011] Hinge 1 has two connecting blocks symmetrically fixed at one end;

[0012] Hinge 2 has two mounting blocks symmetrically fixed at one end;

[0013] The damping rod has a through hole for the connecting block to be fitted with the damping rod, and a circular hole penetrating its body is provided at the axial center of the damping rod. The outer wall of the damping rod has a protrusion, and the inner wall of the through hole has a fixing groove for the protrusion to be fitted with.

[0014] The connecting shaft is fixedly connected to the mounting block at one end to achieve axial fixation, and the other end extends into the round hole to form a rotational fit.

[0015] Furthermore, the protrusion has a cavity inside, and the damping rod has a channel connecting to the circular hole. The lower end of the channel extends into the protrusion and communicates with the cavity. An adjusting component is slidably assembled in the channel. A slider is slidably assembled in the cavity and a threaded rod is rotatably installed. The slider is threadedly connected to the threaded rod through a threaded hole. The lower end of the adjusting component extends through the channel into the cavity and abuts against one end of the slider. The contact surfaces of the slider and the adjusting component have matching inclined portions. One end of the threaded rod extends out of the damping rod. By rotating the threaded rod, the slider is driven to move and push the upper end of the adjusting component to expand into the circular hole.

[0016] Furthermore, the channel includes a groove and a guide hole. The groove is disposed on the inner wall of the circular hole, and the guide hole is disposed in the damping rod. The guide hole extends into the protrusion and connects the groove and the cavity. The adjusting component includes an arc-shaped washer and a top block. The arc-shaped washer is embedded in the groove, and the top block is fixedly connected to the lower end of the arc-shaped washer. The lower end of the top block passes through the guide hole, extends into the cavity, and abuts against one end of the slider.

[0017] Furthermore, a square block is fixedly connected to one end of the connecting shaft, and the mounting block has a square hole. The square block fits into the square hole to achieve axial fixation. A screwing block is fixed to one end of the threaded rod outside the damping rod.

[0018] Furthermore, each end of the slider is fixed with a guide block, and the protrusion has two guide grooves inside for embedding the two corresponding guide blocks.

[0019] Furthermore, guide blocks 2 are fixed at both ends of the top block, and the damping rod has two guide grooves 2 inside for the two guide blocks 2 to be embedded.

[0020] Furthermore, the top of the connecting block has a threaded hole, and a threaded rod is internally threaded into the threaded hole. The lower end of the threaded rod extends into the circular hole and abuts against the damping rod. A rotating block is fixed to one end of the threaded rod extending outside the connecting block.

[0021] Furthermore, the connecting block includes a fixed base and two arc-shaped blocks. The fixed base is fixed to one end of the hinge, and the fixed groove is opened on the top of the fixed base. The two arc-shaped blocks are symmetrically fixed on the top of the fixed base. After the two arc-shaped blocks are assembled with the top of the fixed base, they form a circular hole structure with an opening for the damping rod to be inserted and installed.

[0022] Furthermore, an adjusting block is fixed at one end of the arc-shaped block near the opening end. One adjusting block has a threaded rod three fixed at one end, and the other adjusting block has an adjusting hole for the threaded rod three to pass through. A nut is threadedly connected to one end of the threaded rod three that passes through the adjusting hole, and one end of the nut abuts against one end of the adjusting block with the adjusting hole.

[0023] Furthermore, the arc-shaped block is made of elastic steel.

[0024] The beneficial effects of this utility model are:

[0025] 1. Multi-angle self-locking and optimized space utilization

[0026] This utility model achieves stepless adjustment and self-locking fixation of the hinge opening angle through the cooperation of the damping rod and the connecting shaft, ensuring the stability of the shelf at different angles;

[0027] The folding design of hinge one, hinge two, and damping rod significantly reduces storage volume, aligning with the lightweight trend of portable furniture.

[0028] 2. Extend service life

[0029] This invention uses a rotating threaded rod to drive a slider to move, which in turn pushes a top block to expand an arc-shaped washer into a circular hole. This causes the arc-shaped washer to compress the damping rod, thereby increasing the contact area between the damping rod and the connecting shaft. This increases the pressure between the damping rod and the connecting shaft, thus improving the friction between them. This effectively solves the problem that after prolonged use of the hinge, the connecting shaft will continuously rub against the inner wall of the circular hole, leading to wear on the inner wall of the damping rod and insufficient friction between the connecting shaft and the damping rod. It can effectively and precisely adjust the damping force and avoid loosening due to insufficient friction during folding.

[0030] This utility model provides a threaded rod that extends into the circular hole and abuts against the damping rod. By rotating the threaded rod, pressure can be applied to the damping rod, causing it to be compressed and deformed. This compensates for the wear gap in the inner wall of the circular hole of the damping rod and reduces the damping force attenuation caused by long-term use.

[0031] This invention utilizes two arc-shaped blocks and two adjusting blocks made of elastic steel. By rotating the nut, the thread moves along the threaded rod, causing one end of the nut to contact one of the adjusting blocks and continue moving along the threaded rod. This brings the two adjusting blocks closer together, and the adjusting blocks drive the arc-shaped blocks to compress the damping rod. The damping rod is compressed and deformed, compensating for the wear gaps in the inner wall of the circular hole of the damping rod and reducing the attenuation of damping force due to long-term use. Attached Figure Description

[0032] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0033] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0034] Figure 2 This is a partial structural schematic diagram of Embodiment 1 of the present utility model;

[0035] Figure 3 This is a schematic diagram of the damping rod according to Embodiment 1 of this utility model;

[0036] Figure 4 This is a schematic diagram of the connecting shaft in Embodiment 1 of this utility model;

[0037] Figure 5 This is a cross-sectional view of the damping rod in Embodiment 1 of this utility model. Figure 1 ;

[0038] Figure 6 This is an assembly cross-sectional view of the damping rod, adjusting component, threaded rod 1, and slider according to Embodiment 1 of this utility model;

[0039] Figure 7 This is a cross-sectional view of the damping rod in Embodiment 1 of this utility model. Figure 2 ;

[0040] Figure 8 This is Embodiment 1 of the present utility model. Figure 5 Enlarged view of point A in the middle;

[0041] Figure 9 This is a schematic diagram of the connecting block in Embodiment 2 of this utility model;

[0042] Figure 10 This is a cross-sectional view of the connecting block in Embodiment 2 of this utility model;

[0043] Figure 11 This is a schematic diagram of the connecting block in Embodiment 3 of this utility model;

[0044] Figure 12 This is a cross-sectional view of the connecting block in Embodiment 3 of this utility model.

[0045] In the diagram: 1. Hinge 1; 2. Connecting block; 3. Hinge 2; 4. Mounting block; 5. Damping rod; 6. Through hole; 7. Cavity; 8. Round hole; 9. Slider; 10. Threaded rod 1; 11. Inclined part; 12. Connecting shaft; 13. Protrusion; 14. Fixing groove; 15. Groove; 16. Guide hole; 17. Arc-shaped washer; 18. Top block; 19. Square block; 20. Square hole; 21. Tightening block; 22. Guide block 1; 23. Guide groove 1; 24. Guide block 2; 25. Guide groove 2; 26. Threaded hole 1; 27. Threaded rod 2; 28. Rotating block; 29. ​​Fixing seat; 30. Arc-shaped block; 31. Adjusting block; 32. Threaded rod 3; 33. Adjusting hole; 34. Nut. Detailed Implementation

[0046] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0047] Example 1, such as Figure 1-4 As shown, a multi-angle self-locking folding beach chair shelf hinge includes a first hinge 1, a second hinge 3, a damping rod 5, and a connecting shaft 12. Two connecting blocks 2 are symmetrically fixed to one end of the first hinge 1, and two mounting blocks 4 are symmetrically fixed to one end of the second hinge 3. Each connecting block 2 has a through hole 6 for the damping rod 5 to be inserted. The damping rod 5 has a circular hole 8 penetrating its body at its axial center position. The outer wall of the damping rod 5 has a protrusion 13, and the inner wall of the through hole 6 has a fixing groove 14 for the protrusion 13 to be inserted. One end of the connecting shaft 12 is fixedly connected to the mounting block 4 to realize the hinge... One end is fixed, and the other end extends into the round hole 8 to form a rotational fit. Through the cooperation of the damping rod 5 and the connecting shaft 12, the hinge opening angle can be infinitely adjusted and self-locked, ensuring the stability of the shelf at different angles. One end of the connecting shaft 12 is fixedly connected to the square block 19. The mounting block 4 has a square hole 20. The square block 19 and the square hole 20 are fitted together to achieve axial fixation. The threaded rod 10 is located outside the damping rod 5 and has a screwing block 21 fixed at one end. The connecting shaft 12 is fitted into the square hole 20 of the mounting block 4 through the square block 19 to achieve quick axial fixation, which is convenient for disassembly, maintenance or replacement of parts.

[0048] like Figure 1-8As shown, the protrusion 13 has a cavity 7 inside, and the damping rod 5 has a channel with a connecting circular hole 8 inside. The lower end of the channel extends into the protrusion 13 and communicates with the cavity 7. An adjusting component is slidably assembled in the channel. A slider 9 is slidably assembled in the cavity 7 and a threaded rod 10 is rotatably mounted thereon. The slider 9 moves along the direction of the cavity 7. The slider 9 is threadedly connected to the threaded rod 10 through a threaded hole. The lower end of the adjusting component extends into the cavity 7 through the channel and abuts against one end of the slider 9. The contact surfaces of the slider 9 and the adjusting component have matching inclined portions 11 to ensure that the direction of thrust transmission is consistent during sliding. One end of the threaded rod 10 extends outside the damping rod 5. Rotating the threaded rod 10 drives the slider 9 to move and pushes the adjusting component. The upper end expands into the circular hole 8. The channel includes a groove 15 and a guide hole 16. The groove 15 is disposed on the inner wall of the circular hole 8. The guide hole 16 is disposed in the damping rod 5. The guide hole 16 extends into the protrusion 13. The guide hole 16 connects the groove 15 and the cavity 7. The adjusting component includes an arc-shaped pad 17 and a top block 18. The arc-shaped pad 17 is embedded in the groove 15. The top block 18 is fixedly connected to the lower end of the arc-shaped pad 17. The lower end of the top block 18 passes through the guide hole 16 and extends into the cavity 7, abutting against one end of the slider 9. The lower end of the top block 18 always abuts against the top of the slider 9. Two inclined parts 11 are respectively disposed at the lower end of the top block 18 and the upper end of the slider 9. The top block 18 moves along the direction of the guide hole 16. Rotating the threaded rod 10 drives the slider 9 to move and pushes the top block 18 to cause the arc-shaped pad 17 to expand into the round hole 8, so that the arc-shaped pad 17 squeezes the damping rod 5, thereby putting pressure on the damping rod 5, increasing the contact area between the damping rod 5 and the connecting shaft 12, and increasing the pressure between the damping rod 5 and the connecting shaft 12, thereby increasing the friction between the connecting shaft 12 and the damping rod 5.

[0049] like Figure 5-8 As shown, guide blocks 22 are fixed at both ends of the slider 9. The protrusion 13 has two guide grooves 23 inside, each for embedding into one of the guide blocks 22. Guide blocks 24 are fixed at both ends of the top block 18. The damping rod 5 has two guide grooves 25 inside, each for embedding into one of the guide blocks 24. The slider 9 and top block 18 are respectively equipped with guide blocks 22 and 24, which, together with guide grooves 23 and 25, restrict the displacement direction of the components and reduce the risk of wear due to off-center loading.

[0050] The specific operation method of Embodiment 1 of this utility model is as follows:

[0051] By rotating the threaded rod 10, the slider 9 can be driven to move along the cavity 7. The slider 9 moves away from the end of the screwing block 21. The electric guide block 22 of the slider 9 moves along the guide groove 23. With the cooperation of the two inclined parts 11, the slider 9 pushes the top block 18 to move along the guide hole 16. The top block 18 drives the guide block 24 to move along the guide groove 25. The top block 18 drives the arc-shaped washer 17 to expand into the round hole 8, so that the arc-shaped washer 17 squeezes the damping rod 5, thereby making the damping rod 5 pressurized. This increases the contact area between the damping rod 5 and the connecting shaft 12, and at the same time increases the pressure between the damping rod 5 and the connecting shaft 12, thereby increasing the friction between the connecting shaft 12 and the damping rod 5.

[0052] In this embodiment of the invention, the damping rod 5 and the connecting shaft 12 work together to achieve stepless adjustment and self-locking of the hinge opening angle, ensuring the stability of the shelf at different angles. The folding design of hinge 1, hinge 3 and damping rod 5 significantly reduces the storage volume, conforming to the lightweight trend of portable furniture. The slider 9 and the top block 18 are respectively equipped with guide block 22 and guide block 24, which, together with guide groove 23 and guide groove 25, restrict the displacement direction of the components and reduce the risk of wear caused by off-center loading. The invention has a wide range of applications, and the hinge structure is compatible with beach chairs, folding tables and other scenarios.

[0053] Example 2, as follows Figure 9-10 As shown, the top of the connecting block 2 has a threaded hole 26. A threaded rod 27 is threaded into the threaded hole 26. The lower end of the threaded rod 27 extends into the circular hole 8 and abuts against the damping rod 5. A rotating block 28 is fixed to the end of the threaded rod 27 extending outside the connecting block 2. Rotating the threaded rod 27 causes it to move along the threaded hole 26, while one end of the threaded rod 27 moves towards the damping rod 5.

[0054] The specific operation method of Embodiment 2 of this utility model is as follows:

[0055] Pressure can be applied to the damping rod 5 by rotating the threaded rod 27. The end of the threaded rod 27 extends into the round hole 8 and contacts the outer wall of the damping rod 5. The deformation of the damping rod 5 is adjusted by axial pressure. The damping rod 5 is compressed and deformed, which compensates for the wear gap of the inner wall of the round hole 8 of the damping rod 5, increases the contact area between the damping rod 5 and the connecting shaft 12, and increases the pressure between the damping rod 5 and the connecting shaft 12. This increases the friction between the connecting shaft 12 and the damping rod 5 and reduces the damping force attenuation caused by long-term use.

[0056] In the second embodiment of this utility model, a threaded rod 27 extends into the circular hole 8 and abuts against the damping rod 5. By rotating the threaded rod 27, pressure can be applied to the damping rod 5, causing the damping rod 5 to be compressed and deformed. This compensates for the wear gap in the inner wall of the circular hole 8 of the damping rod 5, reduces the damping force attenuation caused by long-term use, and extends the service life of this utility model.

[0057] Example 3, as follows Figure 11-12 As shown, the connecting block 2 includes a fixed base 29 and two arc-shaped blocks 30. The fixed base 29 is fixed to one end of the hinge 1. The fixed groove 14 is opened on the top of the fixed base 29. The two arc-shaped blocks 30 are symmetrically fixed on the top of the fixed base 29. After the two arc-shaped blocks 30 are assembled with the top of the fixed base 29, they form a circular hole 8 structure with an opening for the damping rod 5 to be inserted and installed. An adjusting block 31 is fixed to one end of the arc-shaped block 30 near the opening end. One end of the adjusting block 31 is fixed with a threaded rod 32. The other adjusting block 31 has an adjusting hole 33 for the threaded rod 32 to pass through. The end of the threaded rod 32 passing through the adjusting hole 33 is threadedly connected to a nut 34. One end of the nut 34 abuts against one end of the adjusting block 31 with the adjusting hole 33. The arc-shaped block 30 is made of elastic steel.

[0058] The specific operation method of Embodiment 3 of this utility model is as follows:

[0059] Rotating the nut 34 causes the thread to move along the threaded rod 32, so that one end of the nut 34 is against one of the adjusting blocks 31 and continues to move along the threaded rod 32, so that the two adjusting blocks 31 are close to each other. The adjusting block 31 drives the arc-shaped block 30 to squeeze the damping rod 5, and the damping rod 5 is compressed and deformed, increasing the contact area between the damping rod 5 and the connecting shaft 12, and at the same time increasing the pressure between the damping rod 5 and the connecting shaft 12, thereby increasing the friction between the connecting shaft 12 and the damping rod 5, and compensating for the wear gap of the inner wall of the circular hole 8 of the damping rod 5.

[0060] This utility model embodiment three uses two arc-shaped blocks 30 and two adjusting blocks 31 made of elastic steel to cooperate. After long-term use of this utility model, the squeezing force of the two arc-shaped blocks 30 on the damping rod 5 can be adjusted by rotating the nut 34, causing the damping rod 5 to compress and deform, increasing the contact area between the damping rod 5 and the connecting shaft 12, and increasing the pressure between the damping rod 5 and the connecting shaft 12, thereby improving the friction between the connecting shaft 12 and the damping rod 5 and extending the service life of this utility model. The arc-shaped blocks 30 with their arc structure design achieve controllable elastic deformation. The opening size can be precisely controlled or the assembly gap can be adaptively compensated by cooperating with the adjusting blocks 31, the threaded rod 32 and the nut 34.

[0061] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-angle self-locking folding beach chair storage hinge, characterized in that, include: Hinge 1 (1), with two connecting blocks (2) symmetrically fixed at one end; Hinge 2 (3), with two mounting blocks (4) symmetrically fixed at one end; The damping rod (5) has a through hole (6) for the damping rod (5) to be inserted in the connecting block (2). The damping rod (5) has a circular hole (8) that penetrates its body at the axial center position. The outer wall of the damping rod (5) has a protrusion (13). The inner wall of the through hole (6) has a fixing groove (14) for the protrusion (13) to be inserted in the through hole (6). The connecting shaft (12) is fixedly connected to the mounting block (4) at one end to achieve axial fixation, and the other end extends into the round hole (8) to form a rotational fit.

2. The multi-angle self-locking folding beach chair storage hinge according to claim 1, characterized in that, The protrusion (13) has a cavity (7) inside, and the damping rod (5) has a channel that connects to the circular hole (8). The lower end of the channel extends into the protrusion (13) and is connected to the cavity (7). An adjusting component is slidably assembled in the channel. A slider (9) is slidably assembled in the cavity (7) and a threaded rod (10) is rotatably installed. The slider (9) is threadedly connected to the threaded rod (10) through a threaded hole. The lower end of the adjusting component extends through the channel into the cavity (7) and abuts against one end of the slider (9). The contact surface between the slider (9) and the adjusting component has a matching inclined part (11). One end of the threaded rod (10) extends out of the damping rod (5). By rotating the threaded rod (10), the slider (9) is driven to move and the upper end of the adjusting component is pushed to expand into the circular hole (8).

3. The multi-angle self-locking folding beach chair storage hinge according to claim 2, characterized in that, The channel includes a groove (15) and a guide hole (16). The groove (15) is disposed on the inner wall of the circular hole (8). The guide hole (16) is disposed in the damping rod (5). The guide hole (16) extends into the protrusion (13). The guide hole (16) connects the groove (15) and the cavity (7). The adjusting component includes an arc-shaped pad (17) and a top block (18). The arc-shaped pad (17) is embedded in the groove (15). The top block (18) is fixedly connected to the lower end of the arc-shaped pad (17). The lower end of the top block (18) passes through the guide hole (16) and extends into the cavity (7) and abuts against one end of the slider (9).

4. The multi-angle self-locking folding beach chair storage hinge according to claim 2, characterized in that, One end of the connecting shaft (12) is fixedly connected to a square block (19), and the mounting block (4) has a square hole (20). The square block (19) and the square hole (20) are fitted together to achieve axial fixation. The threaded rod (10) is located outside the damping rod (5) and has a screwing block (21) fixed at one end.

5. The multi-angle self-locking folding beach chair storage hinge according to claim 3, characterized in that, Both ends of the slider (9) are fixed with guide blocks (22), and the protrusion (13) has two guide grooves (23) for embedding the two corresponding guide blocks (22).

6. The multi-angle self-locking folding beach chair storage hinge according to claim 3, characterized in that, The top block (18) has guide blocks (24) fixed at both ends. The damping rod (5) has two guide grooves (25) inside for the two guide blocks (24) to be embedded.

7. The multi-angle self-locking folding beach chair storage hinge according to claim 1, characterized in that... The top of the connecting block (2) has a threaded hole (26), and a threaded rod (27) is threadedly connected inside the threaded hole (26). The lower end of the threaded rod (27) extends into the round hole (8) and abuts against the damping rod (5). A rotating block (28) is fixed at one end of the threaded rod (27) extending outside the connecting block (2).

8. The multi-angle self-locking folding beach chair storage hinge according to claim 1, characterized in that, The connecting block (2) includes a fixed seat (29) and two arc-shaped blocks (30). The fixed seat (29) is fixed to one end of the hinge (1). The fixed groove (14) is opened on the top of the fixed seat (29). The two arc-shaped blocks (30) are symmetrically fixed on the top of the fixed seat (29). After the two arc-shaped blocks (30) are assembled with the top of the fixed seat (29), they form a round hole (8) structure with an opening for the damping rod (5) to be inserted and installed.

9. A multi-angle self-locking folding beach chair shelf hinge according to claim 8, characterized in that, An adjusting block (31) is fixed at one end of the arc-shaped block (30) near the opening end. One adjusting block (31) has a threaded rod (32) fixed at one end, and the other adjusting block (31) has an adjusting hole (33) for the threaded rod (32) to pass through. The threaded rod (32) is threaded to a nut (34) at one end of the adjusting hole (33). One end of the nut (34) abuts against one end of the adjusting block (31) with the adjusting hole (33).

10. A multi-angle self-locking folding beach chair shelf hinge according to claim 9, characterized in that, The arc-shaped block (30) is made of elastic steel.

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