Backrest lock

Abstract

The utility model belongs to the technical field of automobile parts. The universal backrest lock solves the problem that lock blades of two paired backrest locks in the prior art cannot be used universally. The backrest lock comprises a lock shell, a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are fixedly arranged on the lock shell, the first rotating shaft is movably sleeved with a lock hook and a first return spring, and the second rotating shaft is movably sleeved with a second return spring, a pressing piece, a limiting plate and a third return spring. A limiting groove is formed in the side wall, adjacent to the lock hook, of the limiting plate, a first abutting face is arranged on the edge of a groove opening of the limiting groove, the pressing piece is provided with a bent part arranged in the limiting groove, and the side wall, adjacent to the limiting plate, of the lock hook is provided with a second abutting face and a third abutting face which are arranged in a crossed mode. And under the action of the first return spring, the second return spring and the third return spring, the first abutting surface abuts against the second abutting surface, and the bending part abuts against the third abutting surface. Therefore, the lock hooks and the limiting plates of the two backrest locks in pairs can be universal.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology and relates to a backrest lock. Background Technology

[0002] Currently, the backrests of the driver and passenger seats in cars on the market are usually adjustable in angle. Therefore, backrest locks need to be installed on both sides of the driver and passenger seats to lock and unlock the seat back and seat cushion. For example, Chinese patent literature discloses a backrest lock (application number: 201721875665.2), which includes a lock shell and a lock cover. The lock shell and lock cover are connected by a first rivet and a second rivet. The lock shell is movably provided with a locking leaf and a stop hook that can mesh with each other. The locking leaf is sleeved on the first rivet, and the stop hook is sleeved on the second rivet. Both the locking leaf and the stop hook are equipped with torsion springs. A locking plate is also sleeved on the second rivet. The locking leaf has a boss. One end of the locking plate can abut against the boss, and the other end has a bent part that abuts against one side of the stop hook. The locking plate is also equipped with a return torsion spring, which is sleeved on the second rivet.

[0003] The backrest lock has the following shortcomings during use: When the backrest lock is in the locked state, the locking leaf and the stop hook are engaged, and one end of the locking plate abuts against the boss of the locking leaf, making the backrest lock structure more stable in the locked working state. Since the backrest locks are used in pairs, and the locking leaf of the backrest lock has a boss formed on one side, it not only increases the processing difficulty of the locking leaf, but also makes the locking leaves of the two backrest locks in a pair not interchangeable (even if the locking leaves are made, the left and right parts need to be distinguished). Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a backrest lock. The technical problem this invention aims to solve is the incompatibility of the locking levers of existing paired backrest locks.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A backrest lock includes a lock housing and a first rotating shaft and a second rotating shaft respectively fixed on the lock housing. A lock hook and a first return spring are movably sleeved on the first rotating shaft. A second return spring, a pressing plate, a limiting plate, and a third return spring are movably sleeved on the second rotating shaft. The limiting plate has a limiting groove on its side wall adjacent to the lock hook. A first abutting surface is provided on the edge of the groove opening. The pressing plate has a bent portion disposed within the limiting groove. The lock hook has a second abutting surface and a third abutting surface intersecting on its side wall adjacent to the limiting plate. Under the action of the first, second, and third return springs, the first and second abutting surfaces abut against each other, and the bent portion abuts against the third abutting surface.

[0007] Unlike existing technologies, this backrest lock eliminates the boss structure on the end face of the lock hook. The first and second abutment surfaces, along with the bent portion and the third abutment surface, abut against each other. Simultaneously, under the action of the first return spring, the pressure plate under the action of the second return spring, and the limiting plate under the action of the third return spring, the lock hook, the pressure plate, and the limiting plate remain relatively stationary under the action of friction, thus achieving the locking of the backrest lock. This allows the lock hooks and limiting plates of the two backrest lock pairs to be interchangeable, reducing the variety of shapes required for the internal parts of the two backrest lock pairs due to symmetry requirements. Furthermore, it can further reduce the thickness of the backrest lock, meeting the need for a smaller Y-axis arrangement space.

[0008] In the aforementioned backrest lock, both the first and third abutment surfaces are concave arc-shaped surfaces, while the surface of the bent portion that abuts against the third abutment surface and the second abutment surface are convex arc-shaped surfaces. This ensures that the contact area between the lock hook and the bent portion and the limiting plate is within design requirements, improving the stability and reliability of the backrest lock.

[0009] In the aforementioned backrest lock, a limiting pad is fixed inside the lock housing. The limiting pad is located below the bent portion, and its surface is spherical, abutting against the end face of the lock hook. This allows the limiting pad to guide and limit the lock hook as it moves, preventing it from axially shifting along the first pivot axis.

[0010] In the aforementioned backrest lock, a limiting post is fixedly provided on the lock housing. A gap exists between the limiting post and the lock hook, and the limiting post is located between the first rotating shaft and the limiting pad. The limiting post can limit the axial movement of the lock hook along the first rotating shaft, ensuring that the contact area between the first abutment surface, the second abutment surface, and the bent portion and the third abutment surface is within design requirements.

[0011] In the aforementioned backrest lock, the lock hook is further covered with a rubber sleeve, and the limiting pad, the bent portion, and the first abutting surface all abut against the rubber sleeve. The rubber sleeve serves two purposes: firstly, it reduces the noise generated by the collision between the lock hook and the bolt during operation; secondly, it increases the friction between the lock hook, the clamping plate, and the limiting plate when they abut against each other.

[0012] In the aforementioned backrest lock, the lock housing includes a base and a lock cover, which are connected by a first pivot and a second pivot. The base and lock cover each have an inwardly recessed first recess and a second recess, located on opposite sides of the lock hook. The lock housing, including the base and lock cover, facilitates component assembly. The first and second recesses limit the axial movement of the lock hook along the first pivot, further ensuring that the contact area between the first and second abutment surfaces, as well as the contact area between the bent portion and the third abutment surface, is within design requirements, thereby improving the stability and reliability of the backrest lock.

[0013] In the aforementioned backrest lock, the limiting plate has mounting holes adjacent to the first abutment surface. A spring cover plate is also fitted onto the second rotating shaft, located between the limiting plate and the third return spring. The mounting holes facilitate the installation of pull rods or cables. The proximity of the mounting holes to the first abutment surface allows for better disengagement of the first and second abutment surfaces, as well as the bent portion from the third abutment surface, when the user rotates the limiting plate using a pull rod or cable. The spring cover plate ensures that the spring force of the third return spring is evenly applied to the limiting plate, preventing the contact positions of the first and second abutment surfaces, as well as the bent portion from shifting due to axial movement of the limiting plate and the clamping plate along the second rotating shaft. This improves the stability and reliability of the backrest lock.

[0014] Compared with existing technologies, the advantages of this backrest lock are: it enables the locking hooks and limiting plates of the two backrest locks in a pair to be interchangeable, reduces the variety of shapes of the internal parts of the two backrest locks in a pair due to the need for symmetry, and at the same time, it can further compress the thickness space of the backrest lock to meet the needs of smaller Y-axis arrangement space. Attached Figure Description

[0015] Figure 1 This is a 3D structural diagram of the backrest lock.

[0016] Figure 2 This is a side view structural diagram of the backrest lock.

[0017] Figure 3 This is an exploded view of a backrest lock.

[0018] Figure 4 This is a schematic diagram of the backrest lock after the base has been removed.

[0019] Figure 5 This is a three-dimensional structural diagram of the backrest lock hook.

[0020] Figure 6 This is a three-dimensional structural diagram of the backrest lock limiting plate.

[0021] In the diagram, 1 is the lock housing; 1a is the base; 1a1 is the first recessed portion; 1b is the lock cover; 1b1 is the second recessed portion; 2 is the first pivot; 3 is the second pivot; 4 is the lock hook; 4a is the second abutment surface; 4b is the third abutment surface; 5 is the first return spring; 6 is the second return spring; 7 is the clamping plate; 7a is the bent portion; 8 is the limiting plate; 8a is the limiting groove; 8b is the first abutment surface; 8c is the mounting hole; 9 is the third return spring; 10 is the limiting pad; 11 is the limiting post; 12 is the rubber sleeve; and 13 is the spring cover plate. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] A type of backrest lock, see reference Figure 1-6 The lock includes a lock housing 1 and a first rotating shaft 2 and a second rotating shaft 3 respectively fixed on the lock housing 1. A lock hook 4 and a first return spring 5 are movably sleeved on the first rotating shaft 2. A second return spring 6, a pressing plate 7, a limiting plate 8 and a third return spring 9 are movably sleeved on the second rotating shaft 3. The limiting plate 8 has a limiting groove 8a on the side wall adjacent to the lock hook 4. The edge of the groove of the limiting groove 8a has a first abutting surface 8b. The pressing plate 7 has a bent portion 7a disposed in the limiting groove 8a. The side wall adjacent to the lock hook 4 and the limiting plate 8 has a second abutting surface 4a and a third abutting surface 4b arranged intersectingly. Under the action of the first return spring 5, the second return spring 6 and the third return spring 9, the first abutting surface 8b and the second abutting surface 4a abut against each other, and the bent portion 7a abuts against the third abutting surface 4b.

[0024] Specifically, refer to Figure 1-6 The first abutting surface 8b and the third abutting surface 4b are both concave arc-shaped surfaces, and the surface of the bent portion 7a that abuts against the third abutting surface 4b and the second abutting surface 4a are both convex arc-shaped surfaces.

[0025] In this embodiment, the locking hook 4 is preferably covered with a rubber sleeve 12, and the limiting pad 10, the bending part 7a and the first abutting surface 8b are all abutted against the rubber sleeve 12 respectively; preferably, the limiting plate 8 has a mounting hole 8c, the mounting hole 8c is arranged adjacent to the first abutting surface 8b, and the second rotating shaft 3 is also fitted with a spring cover plate 13, the spring cover plate 13 is located between the limiting plate 8 and the third return spring 9.

[0026] Furthermore, referring to Figure 1-6A limiting pad 10 is fixed inside the lock housing 1. The limiting pad 10 is located below the bent portion 7a. The surface of the limiting pad 10 is spherical and abuts against the end face of the lock hook 4.

[0027] Furthermore, referring to Figure 1-6 A limiting post 11 is fixed on the lock housing 1. There is a gap between the limiting post 11 and the lock hook 4. The limiting post 11 is located between the first rotating shaft 2 and the limiting pad 10.

[0028] Furthermore, referring to Figure 1-6 The lock case 1 includes a base 1a and a lock cover 1b. The base 1a and the lock cover 1b are connected by the first rotating shaft 2 and the second rotating shaft 3. The opposite parts of the base 1a and the lock cover 1b respectively have an inwardly recessed first concave portion 1a1 and a second concave portion 1b1. The first concave portion 1a1 and the second concave portion 1b1 are respectively located on both sides of the lock hook 4.

[0029] The following explains the working principle of this backrest lock:

[0030] In use, a pull rod or cable is installed on the mounting hole 8c on the limiting plate 8. When the backrest lock is in the locked state (refer to...), Figure 4 The first abutting surface 8b and the second abutting surface 4a abut against each other, the bent part 7a abuts against the third abutting surface 4b, and the locking hook 4, under the action of the first return spring 5, the pressing plate 7, under the action of the second return spring 6, and the limiting plate 8, under the action of the third return spring 9, keep the locking hook 4, the pressing plate 7, and the limiting plate 8 in a relatively static state under the action of friction. When the locking hook 4 is subjected to an external force parallel to the direction of the clearance notch of the lock case 1 (i.e., when the bolt (not shown in the figure) located in the locking hook 4 wants to disengage from the locking hook 4), the locking hook 4 continuously squeezes the pressing plate 7 and the limiting plate 8 through the third abutting surface 4b, and achieves relative stillness of the locking hook 4 by means of the reaction force, thereby keeping the backrest lock in a locked state.

[0031] When the backrest lock needs to be unlocked, the user pulls the lever or cable to make the limiting plate 8 rotate. The limiting plate 8 drives the pressing plate 7 to rotate synchronously, so that the first abutting surface 8b, the second abutting surface 4a, and the bent part 7a disengage from the third abutting surface 4b, thereby allowing the lock hook 4 to rotate and unlock under the action of the first return spring 5.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A backrest lock, comprising a lock housing (1) and a first rotating shaft (2) and a second rotating shaft (3) respectively fixed on the lock housing (1), wherein a lock hook (4) and a first return spring (5) are movably sleeved on the first rotating shaft (2), and a second return spring (6), a pressing plate (7), a limiting plate (8), and a third return spring (9) are movably sleeved on the second rotating shaft (3), characterized in that, The limiting plate (8) has a limiting groove (8a) on the side wall adjacent to the locking hook (4). The limiting groove (8a) has a first abutting surface (8b) on the edge of the groove opening. The pressing plate (7) has a bent portion (7a) disposed in the limiting groove (8a). The locking hook (4) has a second abutting surface (4a) and a third abutting surface (4b) arranged intersecting on the side wall adjacent to the limiting plate (8). Under the action of the first return spring (5), the second return spring (6) and the third return spring (9), the first abutting surface (8b) and the second abutting surface (4a) abut against each other, and the bent portion (7a) abuts against the third abutting surface (4b).

2. A backrest lock according to claim 1, characterized in that, Both the first abutting surface (8b) and the third abutting surface (4b) are concave arc-shaped surfaces, and the surface of the bent portion (7a) that abuts against the third abutting surface (4b) and the second abutting surface (4a) are convex arc-shaped surfaces.

3. A backrest lock according to claim 1, characterized in that, A limiting pad (10) is fixed inside the lock housing (1). The limiting pad (10) is located below the bent portion (7a). The surface of the limiting pad (10) is spherical and abuts against the end face of the lock hook (4).

4. A backrest lock according to claim 3, characterized in that, A limiting post (11) is fixed on the lock housing (1), and there is a gap between the limiting post (11) and the lock hook (4), and the limiting post (11) is located between the first rotating shaft (2) and the limiting pad (10).

5. A backrest lock according to claim 3, characterized in that, The locking hook (4) is also covered with a rubber sleeve (12), and the limiting pad (10), the bending part (7a) and the first abutting surface (8b) abut against the rubber sleeve (12) respectively.

6. A backrest lock according to claim 1, 2, 3, 4, or 5, characterized in that, The lock case (1) includes a base (1a) and a lock cover (1b). The base (1a) and the lock cover (1b) are connected by the first pivot (2) and the second pivot (3). The opposite parts of the base (1a) and the lock cover (1b) have an inwardly recessed first recess (1a1) and a second recess (1b1), which are located on both sides of the lock hook (4).

7. A backrest lock according to claim 6, characterized in that, The limiting plate (8) has a mounting hole (8c) which is adjacent to the first abutment surface (8b). The second rotating shaft (3) is also fitted with a spring cover plate (13), which is located between the limiting plate (8) and the third return spring (9).

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