Linkage unlocking and locking mechanism applied to small table board of automobile

Abstract

The invention relates to the technical field of unlocking and locking mechanisms, and discloses a linkage unlocking and locking mechanism applied to an automobile small table board, which comprises a long arm, a short arm, a shaft, a long plate, an unlocking head, a return spring, a torsion spring, a first rivet, a limiting block, an unlocking hook, a limiting cover plate and a long lock, one end of the shaft penetrates through and extends into the short arm and is provided with an unlocking head, the unlocking head and the long arm are in surface-to-surface contact, the outer surface of the shaft is sleeved with the return spring, the return spring is located in the short arm, the limiting block is installed at the other end of the shaft, and the limiting block is rotationally connected with the unlocking hook through a first rivet. The torsional spring is arranged on the outer surface of the first rivet in a sleeving mode. According to the linkage unlocking and locking mechanism applied to the automobile small table board, reliable unlocking and locking functions are provided for the multifunctional automobile small table board in different operation states such as ascending, rotating, unfolding and downward pressing storage.

Description

Technical Field

[0001] The present invention relates to the technical field of unlocking and locking mechanisms, and in particular to a linkage unlocking and locking mechanism applied to a small car table. Background Art

[0002] To meet the needs of car users for convenience and stability in using a tray table, the system implements unlocking and locking functions for the tray table in different operating states, including locking and unlocking operations such as raising, rotating, unfolding, and pressing down for storage. This solves a series of problems existing in existing tray table unlocking mechanisms.

[0003] After searching, Chinese patent, 202411885259.9 A built-in lifting and folding structure for a small car table. The present invention provides a built-in lifting and folding structure for a small car table. Two sets of support plates are respectively arranged on both sides of the interior of the rear box body. A lifting drive mechanism and a small table assembly are respectively arranged on both sides of the support plate through vertically extending inner guide rails and outer guide rails. The lifting drive mechanism and the small table assembly are driven by a plurality of transmission wheels connected to each other. The lifting drive mechanism controls the small table assembly to extend out of the opening of the rear box body, and then flips the central axis plate to realize the unfolding of the small table. The lifting and folding structure provided by the present invention can be applied to a variety of vehicle models in the prior art, occupies a small space, and can realize the adjustment of the small table between the unfolded state and the stored state. Passengers can adjust the small table to the target position according to their needs. An elastic support structure is provided in the embodiment, which can support the small table assembly and increase the supporting strength of the small table assembly in the unfolded state.

[0004] In existing automotive tray tables, the unlocking mechanism typically has a single function and a simple structure, making it difficult to meet the complex operational requirements of multifunctional automotive tray tables. Some traditional unlocking mechanisms can only achieve basic locking and unlocking functions and have deficiencies in stability, reliability, and ease of operation. For example, the aforementioned Chinese patent 202411885259.9, which describes a built-in lifting and folding structure for an automotive tray table, is prone to accidental or unsmooth unlocking during vehicle operation. It also fails to properly coordinate with the tray table's various functional operations, such as the linked unlocking and locking of lifting, rotating, unfolding, and pressing down for storage, affecting the user experience and the overall performance of the tray table. Summary of the Invention

[0005] To achieve reliable unlocking and locking functions for multifunctional car tray tables in different operating states, such as raised, rotated, unfolded, and pressed down for storage, conventional car tray table unlocking mechanisms typically only provide simple locking and unlocking operations, which are difficult to meet the complex usage scenarios of modern multifunctional tray tables. The unlocking mechanism of the present invention can match the various operations of the tray table, ensuring accurate and reliable unlocking and locking in each operating state transition.

[0006] The present invention provides the following technical solution: a linkage unlocking and locking mechanism for a small car table, comprising a long arm, a short arm, a shaft, a long plate, a short plate, an unlocking head, a return spring, a torsion spring, a first rivet, a limit block, an unlocking hook, a limit cover plate, and a long lock, wherein one end of the long arm is rotatably connected to the short arm, one end of the shaft passes through and extends into the interior of the short arm, and is provided with an unlocking head, wherein surface contact is formed between the unlocking head and the long arm, the return spring is sleeved on the outer surface of the shaft and is located inside the short arm, the limit block is mounted on the other end of the shaft, the limit block is rotatably connected to the unlocking hook via the first rivet, and the torsion spring is sleeved on the outer surface of the first rivet;

[0007] The long lock includes a long plate, two short plates and two groups of locking structures. The long plate and the two short plates are arranged opposite to each other to form a sandwich in the middle. One end of the unlocking hook is inserted between the sandwiches. The two groups of locking structures are both arranged in the sandwich and are symmetrically distributed about the unlocking hook.

[0008] Preferably, each set of locking structures includes a long lock core member, a second core member, a first spring, a second rivet, a third rivet, a cylindrical shaft and a second spring;

[0009] The core component is rotatably mounted on the outer surface of the long plate, the first spring is sleeved on the outer surface of the core component, the third rivet is installed on the outer surface of the second core component, the core component is arranged between the cylinder and the third rivet, the second spring is sleeved on the outer surface of the second rivet, the outer surface of the second core component is provided with a small opening and a large opening, one end of the second spring is arranged in the small opening, and the second rivet is arranged in the large opening.

[0010] Preferably, one end of the long arm is provided with a long arm bottom holding head, the outer surface of the long arm holding surface is provided with a long arm holding surface, and the outer surface of the long arm bottom holding head is provided with a long arm mounting hole;

[0011] The outer surface of the short arm is provided with a short arm inner area and a short arm inner surface.

[0012] Preferably, the outer surface of the unlocking head is provided with a first unlocking head surface, a second unlocking head surface and a third unlocking head surface, and the long arm holding surface corresponds to the third unlocking head surface.

[0013] Preferably, one end of the shaft is provided with a shaft head, the outer surface of the shaft is provided with a shaft flat portion, and the outer surface of the shaft flat portion is provided with a shaft threaded hole;

[0014] The second unlocking head surface conflicts with the shaft head.

[0015] Preferably, a first limiting hole is formed on the outer surface of the limiting block, and one end of the shaft passes through the first limiting hole for flat engagement;

[0016] An extension portion is provided on the outer surface of the limit block, and the extension portion is provided with a limit block opening;

[0017] A second limiting hole and a third limiting hole are formed on the outer surface of the limiting block. The first rivet is installed in the second limiting hole. A bolt is installed between the third limiting hole and the shaft threaded hole.

[0018] Preferably, the outer surface of the unlocking hook is provided with an unlocking hook bottom end, an unlocking hook protrusion and an unlocking hook bottom end, and the outer surface of the unlocking hook is provided with an unlocking hook opening; one end of the torsion spring is arranged in the unlocking hook opening, and the other end is arranged in the limit block opening.

[0019] Preferably, a limiting cover plate hole is provided on the outer surface of the limiting cover plate, a limiting cover plate square hole is provided at the axis of the limiting cover plate, the unlocking head passes through the limiting cover plate square hole, and the limiting cover plate hole is installed in the inner area of the short arm by screws.

[0020] Preferably, guide rails are provided on both sides of the long lock, a single lock is provided between the two guide rails, and a pull rope is provided on the outside of the single lock.

[0021] Preferably, a single lock hole is provided on the outer surface of the single lock, and a vortex spring is provided on the outer side of the long lock.

[0022] Compared with the prior art, the present invention provides a linkage unlocking and locking mechanism for a small car table, which has the following beneficial effects:

[0023] This system, used in automotive tray tables, provides reliable unlocking and locking functions for various operating states, including raising, rotating, unfolding, and pressing down for storage. This tray table unlocking mechanism precisely locks and unlocks the tray table during raising, rotating, unfolding, and pressing down for storage. The coordinated operation of various components ensures reliable and stable operation, preventing accidental unlocking while the vehicle is in motion and ensuring safe use. The convenient and ergonomic design makes operation effortless for users. The durable structure and easy maintenance enhance the tray table's performance, meeting user demands for convenience and stability.

[0024] This system is used in a linked unlocking and locking mechanism for a car tray table. When the long arm is vertically folded, the upper arm's retaining surface contacts the third unlocking head surface mounted within the short arm. After the upper arm is vertically folded, the inclined surface aligns with the third unlocking head surface, enabling the unlocking head to move up and down, driving the shaft with it. The shaft then drives the unlocking hook, fixed to the limit block, downward. As the hook moves downward, it collides with the long lock core component, opening the long lock core component through downward pressure, achieving a coordinated, linked state. When the long arm is folded, the upper arm's retaining surface contacts the unlocking head mounted within the short arm's area. After the upper arm is folded, the upper arm's retaining surface aligns with the third unlocking head surface, securing the unlocking head's movement. This allows for precise control of the mechanism's locked state when the long arm is folded. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural stereogram according to this application.

[0026] Figure 2 It is a three-dimensional diagram of the linkage structure according to this application.

[0027] Figure 3 It is a stereogram of the long arm according to the present application.

[0028] Figure 4 It is a three-dimensional diagram of the short arm according to the present application.

[0029] Figure 5 It is a three-dimensional diagram of the unlocking head according to the present application.

[0030] Figure 6 It is a perspective view of the axis according to the present application.

[0031] Figure 7 It is a three-dimensional diagram of the return spring according to the present application.

[0032] Figure 8 It is a three-dimensional diagram of the limiting block according to the present application.

[0033] Figure 9 It is a three-dimensional diagram of the spring-limited unlocking hook according to the present application.

[0034] Figure 10 It is a three-dimensional diagram of the unlocking hook and long lock combination according to the present application.

[0035] Figure 11 It is a three-dimensional diagram of a long lock according to the present application.

[0036] Figure 12 This is a three-dimensional diagram of the limiting cover according to the present application.

[0037] Figure 13It is a three-dimensional diagram of the linkage unlocking and locking structure according to the present application.

[0038] Figure 14 It is a three-dimensional diagram of the linkage unlocking state structure in the fourth embodiment of the present application.

[0039] Figure 15 It is a stereoscopic diagram of a single lock unlocking and locking according to the present application.

[0040] Figure 16 It is a three-dimensional diagram of a vortex spring according to the present application.

[0041] In the picture:

[0042] 100, long arm; 100-1, long arm holding surface; 100-2, long arm mounting hole; 100-3, long arm bottom holding head;

[0043] 200, short arm; 200-1, area inside the short arm; 200-2, inner surface of the short arm;

[0044] 300, shaft; 300-1, shaft head; 300-2, shaft flat portion; 300-3, shaft threaded hole;

[0045] 400, longboard;

[0046] 500, unlocking head; 500-1, first unlocking head surface; 500-2, second unlocking head surface; 500-3, third unlocking head surface;

[0047] 600, return spring; 700, torsion spring; 800, first rivet;

[0048] 900, limit block; 900-1, first limit hole; 900-2, limit block opening; 900-3, second limit hole; 900-4, third limit hole;

[0049] 1000, unlocking hook; 1000-1, bottom end of unlocking hook; 1000-2, unlocking hook opening; 1000-3, unlocking hook protrusion; 1000-4, bottom end of unlocking hook;

[0050] 1100, limit cover plate; 1100-1, limit cover plate hole; 1100-2, limit cover plate square hole;

[0051] 1200, long lock; 1300, long lock core component; 1400, second core component; 1500, first spring; 1600, second rivet; 1700, third rivet; 1800, cylindrical shaft; 1900, second spring;

[0052] 2000, short board; 2100, guide rail; 2200, single lock; 2200-1, single lock hole; 2300, pull rope; 2400, vortex spring. DETAILED DESCRIPTION

[0053] See also Figure 1-16 , a linkage unlocking and locking mechanism for a small car table, comprising a long arm 100, a short arm 200, a shaft 300, a long plate 400, a short plate 2000, an unlocking head 500, a return spring 600, a torsion spring 700, a first rivet 800, a limiting block 900, an unlocking hook 1000, a limiting cover plate 1100, and a long lock 1200. One end of the long arm 100 is rotatably connected to the short arm 200, one end of the shaft 300 passes through and extends to the interior of the short arm 200, and is equipped with an unlocking head 500, a surface contact is formed between the unlocking head 500 and the long arm 100, the return spring 600 is sleeved on the outer surface of the shaft 300 and is located inside the short arm 200, the limiting block 900 is installed at the other end of the shaft 300, the limiting block 900 is rotatably connected to the unlocking hook 1000 through the first rivet 800, and the torsion spring 700 is sleeved on the outer surface of the first rivet 800;

[0054] The long lock 1200 includes a long plate 400, two short plates 2000 and two sets of locking structures. The long plate 400 and the two short plates 2000 are arranged opposite to each other, forming a sandwich in the middle. One end of the unlocking hook 1000 is inserted between the long plates 400. The two sets of locking structures are both arranged in the sandwich and are symmetrically distributed about the unlocking hook 1000.

[0055] Furthermore, each locking structure includes a long lock core member 1300, a second core member 1400, a first spring 1500, a second rivet 1600, a third rivet 1700, a cylindrical shaft 1800 and a second spring 1900;

[0056] The core component 1300 is rotatably mounted on the outer surface of the long plate 400, the first spring 1500 is sleeved on the outer surface of the core component 1300, the third rivet 1700 is installed on the outer surface of the second core component 400, the core component 1300 is arranged between the cylinder 1800 and the third rivet 1700, the second spring 1900 is sleeved on the outer surface of the second rivet 1600, the outer surface of the second core component 1400 is provided with a small opening and a large opening, one end of the second spring 1900 is arranged in the small opening, and the second rivet 1600 is arranged in the large opening.

[0057] Furthermore, one end of the long arm 100 is provided with a long arm bottom holding head 100 - 3 , an outer surface of the long arm holding surface 100 - 3 is provided with a long arm holding surface 100 - 1 , and an outer surface of the long arm bottom holding head 100 - 3 is provided with a long arm mounting hole 100 - 2 ;

[0058] The outer surface of the short arm 200 is provided with a short arm inner region 200 - 1 and a short arm inner surface 200 - 2 .

[0059] Furthermore, the outer surface of the unlocking head 500 is provided with a first unlocking head surface 500 - 1 , a second unlocking head surface 500 - 2 and a third unlocking head surface 500 - 3 , and the long arm holding surface 100 - 1 corresponds to the third unlocking head surface 500 - 3 .

[0060] Furthermore, a shaft head 300 - 1 is provided at one end of the shaft 300 , a shaft flat portion 300 - 2 is provided on the outer surface of the shaft 300 , and a shaft threaded hole 300 - 3 is provided on the outer surface of the shaft flat portion 300 - 2 ;

[0061] The second unlocking head surface 500 - 2 conflicts with the shaft head 300 - 1 .

[0062] The upper unlocking linkage mechanism part is a part in which the upper arm holding surface 100-3 is vertically folded by the long arm 100 and the third unlocking head surface 500-3 installed in the inner area 200-1 of the short arm is in surface contact with it. The third unlocking head surface 500-3 is moved with it by the inclined surface after the upper arm is vertically folded, so that the unlocking head 500 moves up and down, driving the shaft 300 to move with it, and then the shaft 300 drives the unlocking hook 1000 fixed on the limit block 900 to move downward together. The bottom end 1000-1 of the unlocking hook will collide with the long lock core component 1300 while moving downward, and the long lock core component 1300 is opened by the downward pressure to realize the coordinated linkage state.

[0063] As for the upper locking linkage mechanism, when the long arm 100 is folded, the upper arm holding surface 100-1 and the unlocking head 500-3 installed in the inner area 200-1 of the short arm are in surface contact with each other. After the upper arm 100 is folded, the upper arm holding surface 100-1 and the third unlocking head surface 500-3 are fixed to the upper arm holding surface 100-1, thereby realizing the fixed movement of the unlocking head 500. Therefore, when the long arm 100 is folded, the mechanism is in a locked state and the action is precisely controlled.

[0064] Embodiment 2: This embodiment differs from the embodiment 1 in that a first limiting hole 900 - 1 is formed on the outer surface of the limiting block 900 , and one end of the shaft 300 passes through the first limiting hole 900 - 1 for flat engagement;

[0065] An extension portion is provided on the outer surface of the limit block 900, and a limit block opening 900-2 is provided on the extension portion;

[0066] A second limiting hole 900 - 3 and a third limiting hole 900 - 4 are formed on the outer surface of the limiting block 900 . The first rivet 800 is installed in the second limiting hole 900 - 3 . A bolt is installed between the third limiting hole 900 - 4 and the shaft threaded hole 300 - 3 .

[0067] Furthermore, the outer surface of the unlocking hook 1000 is provided with an unlocking hook bottom end 1000-1, an unlocking hook protrusion 1000-3 and an unlocking hook bottom end 1000-4, and the outer surface of the unlocking hook 1000 is provided with an unlocking hook opening 1000-2; one end of the torsion spring 700 is provided in the unlocking hook opening 1000-2, and the other end is provided in the limit block opening 900-2.

[0068] Furthermore, a limiting cover plate hole 1100-1 is opened on the outer surface of the limiting cover plate 1100, and a limiting cover plate square hole 1100-2 is opened at the axis of the limiting cover plate 1100. The unlocking head 500 passes through the limiting cover plate square hole 1100-2, and the limiting cover plate hole 1100-1 is installed in the short arm inner area 200-1 by screws.

[0069] Locked state

[0070] The unlocking head 500 cooperates with the upper arm holding surface 100 - 1 to form a locking structure. Under the elastic force of the linkage return spring 600 , the unlocking head 500 and the upper arm holding surface 100 - 1 can switch back and forth between unlocking and locking. When the long arm 100 is folded, the unlocking holding head 100-3 at the bottom of the long arm and the third unlocking head surface 500-3 move along the curved surface and move to the long arm holding surface 100-1 area. The linkage structure moves upward under the action of the spring 700. The torsion spring 700 is installed in the second limiting hole 900-3 on the unlocking hook 1000 and the rivet 800 is installed. The torsion spring 700 of the limiting column shall not fall off, so that the unlocking hook protrusion 1000-3 and the long lock core component 1300 rotate with the torsion spring 700. When the unlocking hook 1000 passes over the long lock core component 1300, it rotates as the pre-tightening force of the torsion spring 700 returns to trigger the locking state.

[0071] Unlocked status

[0072] When the upper arm 100 is in a vertical state, the upper arm holding surface is at 100-3 and contacts the first unlocking head surface 500-1. The third unlocking head surface 500-3 shows a downward movement trend along the curved surface. The second unlocking head 500-2 is connected to the shaft head 300-1 so that the unlocking head drives the shaft to move. When moving downward, the locking rib is positioned at the first unlocking head surface 500-1 to avoid abnormal noise and large clearance shaking. It moves with the inner surface 200-2 of the short arm to make it move smoothly. The shaft 3 00 passes through the first limit hole 900-1 to match its flat position, and the third limit hole 900-4 is screwed to the shaft threaded hole 300-3 to install them together. The shaft 300 drives the limit block 900 to move downward, and the limit block drives the unlocking hook 1000 to move downward. The unlocking hook 1000 is limited by the limit block opening 900-2 so that it cannot rotate upward and can only move downward. The distance of pressing down allows it to be unlocked with the long lock core component 1300, triggering the unlocking state.

[0073] Unlocking mechanism function realization:

[0074] When the user folds or straightens the long arm 100 of the small table, the linkage mechanism at the bottom cooperates to lock and unlock. When the customer needs to use the small table, the folded long arm 100, the curved surface of the head 100-3 at the bottom of the long arm and the second unlocking head surface 500-3 move to put it into a locked state, so that the customer can use it without any gaps or abnormal noises, making it more comfortable for the customer. When the customer has finished using it, he needs to straighten the long arm, and the curved surface of the head 100-3 at the bottom of the long arm and the third unlocking head surface 500-3 move to put it into an unlocked state so that the small table can be pressed back into the cabin.

[0075] Example 4: This example differs from Example 1 in that a guide rail 2100 is provided on both sides of a long lock 1200, a single lock 2200 is provided between the two guide rails 2100, and a pull rope 2300 is provided on the outside of the single lock 2200. A single lock hole 2200-1 is provided on the outer surface of the single lock 2200, and a vortex spring 2400 is provided on the outside of the long lock 1200.

[0076] Linkage unlock status

[0077] The linked unlocking is achieved by triggering the unlocking state to move the mechanism 2100 downward to unlock it, and the unlocking hook 1000 is unlocked by the long lock core component 1300 through the downward pressure. After unlocking, it moves downward along the guide rails 2100 on both sides to reach the bottom single lock 2200, and moves downward to the single lock lock hole 2200-1 to achieve linked unlocking and locking. By pressing the button to pull the pull rope 2300, the pull rope drives the short lock core component to unlock it. Finally, the middle vortex spring 2400 drives the mechanism component upward along the guide rail back to its original position through the pre-tightening force to realize the linked unlocking cycle.

[0078] In summary, this automotive tray table's interlocking unlocking and locking mechanism provides reliable unlocking and locking functions for various operating conditions, such as raising, rotating, unfolding, and pressing down for storage. This tray table unlocking mechanism precisely locks and unlocks the tray table during raising, rotating, unfolding, and pressing down for storage. The coordinated operation of various components ensures operational reliability and stability, preventing accidental unlocking while the vehicle is in motion and ensuring safe use. The convenient and ergonomic design allows for effortless operation. The durable structure and ease of maintenance enhance the tray table's performance, meeting user demands for convenience and stability.

Claims

1. A linkage unlocking and locking mechanism for a small table in a car, comprising a long arm (100), a short arm (200), a shaft (300), a long plate (400), a short plate (2000), an unlocking head (500), a return spring (600), a torsion spring (700), a first rivet (800), a limiting block (900), an unlocking hook (1000), a limiting cover plate (1100), and a long lock (1200), characterized in that: One end of the long arm (100) is rotatably connected to the short arm (200), one end of the shaft (300) passes through and extends to the interior of the short arm (200), and is installed with an unlocking head (500), and a surface-to-surface contact is formed between the unlocking head (500) and the long arm (100), the return spring (600) is sleeved on the outer surface of the shaft (300) and is located inside the short arm (200), the limit block (900) is installed at the other end of the shaft (300), the limit block (900) is rotatably connected to the unlocking hook (1000) through the first rivet (800), and the torsion spring (700) is sleeved on the outer surface of the first rivet (800); The long lock (1200) comprises a long plate (400), two short plates (2000) and two sets of locking structures. The long plate (400) and the two short plates (2000) are arranged opposite to each other to form a sandwich. One end of the unlocking hook (1000) is inserted between the sandwiches. The two sets of locking structures are both arranged in the sandwich and are symmetrically distributed about the unlocking hook (1000).

2. The linkage unlocking and locking mechanism for a small car table according to claim 1, characterized in that: Each locking structure comprises a long lock core (1300), a second core (1400), a first spring (1500), a second rivet (1600), a third rivet (1700), a cylindrical shaft (1800) and a second spring (1900); The core component (1300) is rotatably mounted on the outer surface of the long plate (400), the first spring (1500) is sleeved on the outer surface of the core component (1300), the third rivet (1700) is mounted on the outer surface of the second core component (400), the core component (1300) is arranged between the cylinder (1800) and the third rivet (1700), the second spring (1900) is sleeved on the outer surface of the second rivet (1600), the outer surface of the second core component (1400) is provided with a small opening and a large opening, one end of the second spring (1900) is arranged in the small opening, and the second rivet (1600) is arranged in the large opening.

3. The linkage unlocking and locking mechanism for a small car table according to claim 1 is characterized in that: One end of the long arm (100) is provided with a long arm bottom retaining head (100-3), the outer surface of the long arm retaining surface (100-3) is provided with a long arm retaining surface (100-1), and the outer surface of the long arm bottom retaining head (100-3) is provided with a long arm mounting hole (100-2); The outer surface of the short arm (200) is provided with a short arm inner area (200-1) and a short arm inner surface (200-2).

4. The linkage unlocking and locking mechanism for a small car table according to claim 3 is characterized in that: The outer surface of the unlocking head (500) is provided with a first unlocking head surface (500-1), a second unlocking head surface (500-2) and a third unlocking head surface (500-3), and the long arm holding surface (100-1) corresponds to the third unlocking head surface (500-3).

5. The linkage unlocking and locking mechanism for a small car table according to claim 4, characterized in that: One end of the shaft (300) is provided with a shaft head (300-1), the outer surface of the shaft (300) is provided with a shaft flat portion (300-2), and the outer surface of the shaft flat portion (300-2) is provided with a shaft threaded hole (300-3); The second unlocking head surface (500-2) conflicts with the shaft head (300-1).

6. The linkage unlocking and locking mechanism for a small car table according to claim 5, characterized in that: A first limiting hole (900-1) is provided on the outer surface of the limiting block (900), and one end of the shaft (300) passes through the first limiting hole (900-1) for flat engagement; An extension portion is provided on the outer surface of the limit block (900), and the extension portion is provided with a limit block opening (900-2); A second limiting hole (900-3) and a third limiting hole (900-4) are provided on the outer surface of the limiting block (900); the first rivet (800) is installed in the second limiting hole (900-3); and a bolt is installed between the third limiting hole (900-4) and the shaft threaded hole (300-3).

7. The linkage unlocking and locking mechanism for a small car table according to claim 6, characterized in that: The outer surface of the unlocking hook (1000) is provided with an unlocking hook bottom end (1000-1), an unlocking hook protrusion (1000-3) and an unlocking hook bottom end (1000-4); the outer surface of the unlocking hook (1000) is provided with an unlocking hook opening (1000-2); one end of the torsion spring (700) is arranged in the unlocking hook opening (1000-2), and the other end is arranged in the limit block opening (900-2).

8. The linkage unlocking and locking mechanism for a small car table according to claim 7, characterized in that: The outer surface of the limiting cover plate (1100) is provided with a limiting cover plate hole (1100-1), the axis of the limiting cover plate (1100) is provided with a limiting cover plate square hole (1100-2), the unlocking head (500) passes through the limiting cover plate square hole (1100-2), and the limiting cover plate hole (1100-1) is installed in the short arm inner area (200-1) by means of screws.

9. The linkage unlocking and locking mechanism for a small car table according to claim 8, characterized in that: Guide rails (2100) are provided on both sides of the long lock (1200), a single lock (2200) is provided between the two guide rails (2100), and a pull rope (2300) is provided on the outer side of the single lock (2200).

10. The linkage unlocking and locking mechanism for a small car table according to claim 9, characterized in that: The outer surface of the single lock (2200) is provided with a single lock hole (2200-1), and the outer side of the long lock (1200) is provided with a vortex spring (2400).

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