Backrest lock

Abstract

The invention discloses a car seat backrest lock, which includes a lock tongue, a connecting rod mechanism, and an operating part for driving the connecting rod mechanism to move; the connecting rod mechanism includes a first connecting rod part, a second connecting rod part, and a third connecting rod part which are hinged in sequence, and the first connecting rod part and the third connecting rod part can also rotate around another hinge point respectively; when in the locked position, the third connecting rod part and the lock tongue are locked together, and the operating part drives the connecting rod mechanism to move, and the third connecting rod part moves and disengages from the lock tongue. The backrest lock drives the lock tongue to unlock through the linkage action of the connecting rod mechanism, and the driving of the connecting rod mechanism is relatively reliable and easy to operate, and the structure is relatively simple, and there is no need to set a complex driving mechanism, which can reduce costs.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, and in particular to a backrest lock. Background Art

[0002] With the popularization of passenger cars, people's requirements for comfort are constantly increasing while meeting safety requirements. Therefore, there is a great market demand for realizing the multifunctionality of rear seats within the limited cabin space.

[0003] At present, the rear seats include more than one backrest, which is locked at the body frame of the rear seats by the backrest lock. After the backrest lock is unlocked, the backrest can be folded forward to cooperate with the overall removal of the floor lock, thereby increasing the storage space. It can be seen that the foldable backrest seat can be switched between the two modes of increasing storage space and increasing seating space. However, the existing backrest lock structure is cumbersome, and how to simplify the structure of the backrest lock is a technical problem that technicians in this field need to solve. Summary of the invention

[0004] The present invention provides a backrest lock, comprising a lock tongue, a connecting rod mechanism, and an operating part driving the connecting rod mechanism to move; the connecting rod mechanism comprises a first connecting rod part, a second connecting rod part, and a third connecting rod part which are hinged in sequence, and the first connecting rod part and the third connecting rod part can also rotate around separately arranged hinge points respectively; when in the locked position, the third connecting rod part and the lock tongue are locked together, the operating part drives the connecting rod mechanism to move, and the third connecting rod part moves accordingly and disengages from the lock tongue.

[0005] Optionally, the locking tongue may also rotate around a corresponding hinge point, and the hinge axis is parallel to each hinge axis of the connecting rod mechanism.

[0006] Optionally, the locking tongue is provided with a first locking tooth, and the third connecting rod portion has a second locking tooth, and when locked, the first locking tooth and the second locking tooth are meshed.

[0007] Optionally, the lock tongue is provided with a torsion spring, and the torsion spring drives the first lock tooth to engage with the second lock tooth. When the linkage mechanism is actuated to cause the third linkage portion to disengage from the lock tongue, the torsion spring drives the lock tongue to rotate and unlock.

[0008] Optionally, at least one of the first link portion and the third link portion is configured with a torsion spring for preventing rotation in an unlocking direction.

[0009] Optionally, it further includes a shell, and the first connecting rod portion, the third connecting rod portion, and the locking tongue are all hinged to the shell to form the corresponding hinge point.

[0010] Optionally, it further includes a guard plate located inside the shell, and the third connecting rod portion and the locking tongue are both hinged to the guard plate.

[0011] Optionally, the operating portion drives the first link portion to rotate, thereby driving the second link portion to move, and then driving the third link portion to rotate around its hinge point.

[0012] Optionally, an indicator is further included, which is linked to the connecting rod mechanism or the locking tongue. When unlocking and / or locking, the indicator is actuated to give an unlocking or locking indication.

[0013] The present invention also provides a car, comprising a rear seat, wherein the rear seat comprises at least one backrest, wherein the backrest is connected to an adjacent backrest or to the vehicle body through a backrest lock, wherein the adjacent backrest or the vehicle body is provided with a latch, and the locking tongue of the backrest lock can engage the latch to lock, or disengage from the latch to unlock.

[0014] The automobile and the backrest lock thereof provided by the present invention drive the lock tongue to unlock through the linkage action of the connecting rod mechanism. The driving of the connecting rod mechanism is relatively reliable and easy to operate. The structure is relatively simple and there is no need to set a complicated driving mechanism, which can reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a specific embodiment of a backrest lock provided by the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram from another perspective;

[0017] Figure 3 for Figure 1 Side view of

[0018] Figure 4 for Figure 3 Right view of;

[0019] Figure 5 for Figure 1 A schematic diagram of disassembling the first shell;

[0020] Figure 6 for Figure 1 A schematic diagram of disassembling the second housing;

[0021] Figure 7 for Figure 6 Schematic diagram after removing the guard plate;

[0022] Figure 8 for Figure 7 Left view of

[0023] Fig. 9 for Figure 7 Schematic diagram after unlocking;

[0024] Fig.10 for Fig. 9 Left view of

[0025] Fig.11 A schematic diagram of locking the first backrest frame and the second backrest frame;

[0026] Fig.12 for Fig.11 Schematic diagram from another perspective;

[0027] Fig.13 for Fig.11 Schematic diagram of the dorsal side.

[0028] Figure 1-13 The reference numerals in the figures are described as follows:

[0029] 100-first shell; 200-second shell;

[0030] 10-first connecting rod; 20-second connecting rod; 30-third connecting rod; 40-lock tongue;

[0031] 501-first hinge axis; 501a-retraction cap; 502-second hinge axis; 503-third hinge axis; 503a-retraction cap; 504-fourth hinge axis; 504a-self-lubricating bearing sleeve; 505-fifth hinge axis; 505a-self-lubricating bearing sleeve;

[0032] 601-first torsion spring; 602-second torsion spring; 603-third torsion spring;

[0033] 70- indicator;

[0034] 80-operation button;

[0035] 90-guard plate;

[0036] A-first backrest frame; A1-mounting bracket; A2-bolt; A21-bolt head;

[0037] B Second backrest frame; B1-latch. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Please refer to Figure 1-5 , Figure 1 A schematic structural diagram of a specific embodiment of a backrest lock provided by the present invention; Figure 2 for Figure 1 Schematic diagram from another perspective; Figure 3 for Figure 1 Side view of Figure 4 for Figure 3Right view of; Figure 5 for Figure 1 A schematic diagram of disassembling the first housing 100; Figure 6 for Figure 1 Schematic diagram of disassembling the second shell 200.

[0040] In this embodiment, the backrest lock is applied to the rear seat of the vehicle. When locked, the backrest of the rear seat is fixed to the rear body of the vehicle. When unlocked, the backrest of the rear seat is unlocked from the body, and the backrest can be folded like the front side of the vehicle.

[0041] like Figure 1 , 2 As shown, the backrest lock includes a shell, which is formed by buckling a first shell 100 and a second shell 200. The backrest lock also includes a lock tongue 40, a connecting rod mechanism and an operating part that drives the connecting rod mechanism to move.

[0042] like Figure 5 , 6 As shown, the connecting rod mechanism specifically includes a first connecting rod portion 10, a second connecting rod portion 20, and a third connecting rod portion 30, which are hinged in sequence, wherein the second connecting rod portion 20 is located in the middle of the connecting rod structure, and its two ends are respectively hinged to the first connecting rod portion 10 and the third connecting rod portion 30 at the second hinge shaft 502 and the third hinge shaft 503, and the second hinge shaft 502 and the third hinge shaft 503 are not connected to the shell.

[0043] The first link part 10 and the third link part 30 also have another hinge point with the housing, and the two can rotate around the corresponding hinge point. Specifically, the middle part of the first link part 10 is also hinged to the first housing 100 at the first hinge axis 501, and the position of the first hinge axis 501 is the hinge point corresponding to the first link part 10. The end of the third link part 30 opposite to the third hinge axis 503 is hinged to the first housing 100 at the fourth hinge axis 504, and the position of the fourth hinge axis 504 is the hinge point corresponding to the third link part 30. It can be seen that the first link part 10, the second link part 20, and the third link part 30 form a linkage mechanism that can be linked, and driving any of the three can drive the linkage mechanism to move, which is specifically manifested in that the first link part 10 will rotate around the first hinge axis 501, the third link part 30 will rotate around the fourth hinge axis 504, and the second link part 20, as a transmission rod, does not rotate around only one point.

[0044] Please continue to refer to Figure 6The middle part of the first link part 10 is hinged to the first housing 100, and one end of the first link part 10 is hinged to the second hinge shaft 502 with the second link part 20. The driving part can be connected to the other end opposite to the second hinge shaft 502. For example, the driving part can be an operation button 70 arranged at the end of the first link part 10. The operation button 70 and the first link part 10 can also be an integrated structure. When the user presses the operation button 70, the first link part 10 will rotate around the first hinge shaft 501, and the first link part 10 will drive the second link part 20 to move, and the second link part 20 will drive the third link part 30 to move. Specifically, Figure 6 In the embodiment, the operation button 70 is pressed approximately in the right direction, the first link portion 10 rotates clockwise, and the second link portion 20 is pulled approximately to the left, and the second link portion 20 drives the third link portion 30 to rotate clockwise.

[0045] The first link part 10 and the third link part 30 are also provided with a first torsion spring 601 and a second torsion spring 602, respectively. One end of the torsion spring is fixed relative to the housing, and the other end is connected to the first link part 10 or the third link part 30, respectively. The first torsion spring 601 and the second torsion spring 602 provide elastic force to prevent the link mechanism from moving in the unlocking direction. When pushing the first link part 10, it is necessary to overcome the elastic force of the first torsion spring 601 and the elastic force of the second torsion spring 602. It can be seen that at least one of the first torsion spring 601 and the second torsion spring 602 can achieve the purpose of recovery. The provision of two torsion springs makes the entire mechanism more reliable. Moreover, when the operation button 70 is provided on the first link part 10, the first torsion spring 70 corresponding to the first link part 10 can enhance the user's sense of control when pressing.

[0046] It can be understood that the operating part is provided here to drive the connecting rod mechanism to move. Figure 6 In the setting mode, pressing the operation button 70 is to push the first connecting rod 10 to rotate clockwise. To achieve clockwise drive, the operation part is not limited to the operation button 70 set at the end of the first connecting rod 10 in this embodiment, and the operation mode is not limited to the pressing drive mode. For example, the operation part can be provided with a lifting member, which is pulled to drive the first connecting rod 10 to rotate clockwise during operation; or the operation part can be set at the position where the first connecting rod 10 is hinged with the second hinge shaft 502, and the first connecting rod 10 can be pushed or pulled to rotate clockwise, and its internal components can be adjusted accordingly, and this scheme does not make specific restrictions.

[0047] Based on the same principle, the operating part can also drive the linkage mechanism to move by pushing or pulling the third linkage part 30 or the second linkage part 20. Of course, the first linkage part 10 and the third linkage part 30 can only rotate around the first hinge shaft 501 and the fourth hinge shaft 504 respectively. The operating part is easier to control when operating. The motion trajectory of the second linkage part 20 as a transmission part is relatively complicated. In addition, the third linkage part 30 needs to be used to cooperate with the lock tongue 40. Therefore, the preferred solution is to set the operating part to drive the first linkage part 10. The middle part of the first linkage part 10 is hinged to the housing at the first hinge shaft 501, which is also for the convenience of driving the operating part. If the operating part drives other components in the linkage mechanism, the position where the first linkage part 10 is hinged to the housing is not limited to the middle part, but can also be the end opposite to the hinge position of the second hinge shaft 502.

[0048] Please continue to refer to Figure 7 , Figure 7 for Figure 6 Schematic diagram after removing the guard plate 90.

[0049] The backrest lock also includes a lock tongue 40, the lock tongue 40 and the first housing 100 are hinged to the fifth hinge shaft 505, and the lock tongue 40 is provided with a lock hook, which can be engaged with a lock latch B1 (shown in FIG. Fig.12 , 13 ), the backrest and the vehicle body can be locked by rotating counterclockwise around the fifth hinge shaft 505 to hook the latch B1, and the backrest and the vehicle body can be unlocked by rotating clockwise to disengage the latch B1. In this embodiment, the lock tongue 40 cooperates with the third link part 30, and the outer periphery of the lock tongue 40 facing the third link part 30 is provided with a first locking tooth, and the outer periphery of the third link part 30 is provided with a second locking tooth that can correspond to it. The two are in Figure 6 When in the position shown in FIG. 1 , the second locking tooth of the third link portion 30 and the first locking tooth of the locking tongue 40 are engaged and interlocked.

[0050] It should be noted that the linkage principle of the connecting rod mechanism is used in the present invention to conveniently realize the driving of the lock tongue 40. The first connecting rod part 10, the second connecting rod part 20, and the third connecting rod part 30 are also named based on the connecting rod mechanism, but it is not limited to that the three must be rod-shaped structures, as long as the three can be linked based on the principle of the connecting rod mechanism.

[0051] like Figure 5 As shown, a third torsion spring 603 may also be provided, and the third torsion spring 603 is provided between the locking tongue 40 and the first housing 100 to Figure 7 From a perspective, the third torsion spring 603 provides an elastic force for the lock tongue 40 to rotate clockwise, and the second torsion spring 602 provides an elastic force for the third link portion 30 to rotate counterclockwise, so that the first locking tooth and the second locking tooth can be more closely engaged to keep the lock tongue 40 in a locked state.

[0052] Recombination Figure 5 , 6 It is understood that a guard plate 90 is provided in the housing of the backrest lock, and the fourth hinge shaft 504 and the fifth hinge shaft 505 are fixed to the guard plate 90, and can be connected to the guard plate 90 through a self-lubricating bearing sleeve. Figure 7 A self-lubricating bearing sleeve 504 a at the fourth hinge shaft 504 and a self-lubricating bearing 505 a at the fifth hinge shaft 505 are shown.

[0053] Here, the guard plate 90 installs the third link part 30 and the lock tongue 40 together. The third link part 30 and the lock tongue 40 can be used as an integral lock body part, which is easy to install and replace as a whole, and is beneficial to maintaining the fit between the third link part 30 and the lock tongue 40, ensuring the reliability of unlocking and locking.

[0054] like Figure 6 As shown, the end of the first hinge shaft 501 of the first link part 10 is also provided with a stop cap 501a to prevent the first link part 10 from being separated from the first hinge shaft 501, and serves as a torsion spring seat for the first torsion spring 601, and the first torsion spring 601 is arranged between the stop cap 501a and the first housing 100. The end of the third hinge shaft 503 can also be provided with a stop cap 503a to prevent the third link part 30 and the second link part 20 from being separated from the third hinge shaft 503, and the two ends of the second hinge shaft 502 can be directly riveted to the outer surfaces of both sides of the first link part 10, Figure 6 Rivet 502 is shown.

[0055] Please combine again Figure 8-10 understand, Figure 8 for Figure 7 Left view of Fig. 9 for Figure 7 Schematic diagram after unlocking; Fig.10 for Fig. 9 Left view of .

[0056] The following describes the unlocking and locking process in sequence:

[0057] Unlocking process: Please refer to Figure 7 , the user presses the operation button 70, the first link part 10 rotates clockwise around the first hinge axis 501, pulls the second link part 20 to the left, and drives the third link part 30 to rotate clockwise around the fourth hinge axis 504. During the clockwise rotation of the third link part 30, it gradually moves away from the lock tongue 40, so that the second lock tooth of the third link part 30 and the first lock tooth of the lock tongue 40 are disengaged, and the lock tongue 40 rotates clockwise under the restoring force of the third torsion spring 603 to reach Fig. 9 In the unlocked state shown, the locking tongue 40 is disengaged from the locking latch B1 fixed relative to the vehicle body, thereby unlocking the backrest and the vehicle body, and the backrest can be flipped forward and folded with the seat pan;

[0058] Locking process: see Fig. 9 , rotate the backrest toward the rear of the vehicle, when the lock tongue 40 contacts the lock latch B1 fixed relative to the vehicle body, under the push of the lock latch B1, the lock tongue 40 will overcome the restoring force of the third torsion spring 603 and rotate counterclockwise. Based on the peripheral curve guide design of the lock tongue 40, the lock tongue 40 will continue to rotate until the first lock tooth of the lock tongue 40 is again meshed and locked with the second lock tooth of the third link part 30. The restoring force of the third spring keeps the lock tongue 40 rotating clockwise, and the restoring force of the second spring keeps the third link part 30 rotating counterclockwise, so that the third link part 30 and the lock tongue 40 are locked and maintained in the locked state until the action of the link mechanism described in the unlocking process overcomes the restoring force of the second spring.

[0059] like Figure 7 As shown, an indicator 80 can be further provided, and the indicator 80 can be provided with an indication area, and the indication area can be completely or partially hidden in the housing. At the same time, the indicator 80 and the first connecting rod 10 are linked together. When the connecting rod mechanism is actuated, the indicator 80 is also actuated. After unlocking or locking, the hidden indication area can be exposed to the housing to remind the operator. Fig.10 As shown, the indicated area can be Fig.10 As shown in the "warning unlock" in the figure, a notch is provided at the end of the housing to form an indication window. After unlocking, the indication area rotates to the window position with the rotation of the indicator 80 and is exposed from the end of the housing. It can be understood that the indication area of ​​the indicator 80 can indicate both unlocking and locking, and the indication areas for unlocking and locking can be set at the same time. When locked, the indication area for locking is exposed to the housing, and the indication area for unlocking is hidden in the housing. When unlocking, the indicator 80 changes position with the action of the connecting rod mechanism, and the indication area for unlocking rotates to be exposed to the housing, while the indication area for locking is hidden in the housing.

[0060] The indicator 80 is not limited to being connected to the first connecting rod portion 10 to achieve linkage, but can also be connected to other positions of the connecting rod mechanism or the lock tongue 40. Based on the same principle as the setting position selection of the operation button 70, the preferred solution is to connect the indicator 80 to the first connecting rod portion 10.

[0061] Please continue to refer to Figure 11-13 , Fig.11 A schematic diagram of locking the first backrest frame and the second backrest frame; Fig.12 for Fig.11 Schematic diagram from another perspective; Fig.13 for Fig.11 Schematic diagram of the dorsal side.

[0062] The present embodiment also provides a car, which is provided with a rear seat, and the rear seat includes at least one backrest. Specifically, the backrest lock can be set on a backrest, and the backrest has a backrest frame. Specifically, the backrest lock is set on one side of the first backrest frame A. A mounting bracket A1 can be set on one side of the first backrest frame A. The first shell 100 of the backrest lock is set toward the mounting bracket A1. In this embodiment, the fourth hinge shaft 504 and the fifth hinge shaft 505 are provided with through holes that pass through in the axial direction. Two fasteners can be inserted from the outside of the second shell 200 and penetrate the fourth hinge shaft 504 and the fifth hinge shaft 505, respectively, and then pass through the first shell 100 and connect to the mounting bracket A1, so as to achieve the purpose of fastening the backrest to lock the first backrest frame A. The fasteners can, for example, Fig.11 The bolt A2 shown in Fig.12 The bolt head A21 of the bolt A2 is shown in FIG. Figure 2 As shown, the fourth hinge shaft 504 and the fifth hinge shaft 505 can be riveted to the guard plate 90, and the end surface formed by riveting can be used as the abutting end surface of the bolt head A21, and the first shell 100 and the second shell 200 can be fixed by screws. The second backrest frame B and the first backrest frame A are arranged side by side, and a latch B1 is provided on the side of the second backrest frame B adjacent to the first backrest frame A. The first backrest frame A and the second backrest frame B can be locked or unlocked by the backrest lock, and locking or unlocking is realized accordingly.

[0063] The second backrest frame B and the vehicle body can also be fixed by the backrest lock in the above embodiment, or can be fixed by other methods or other methods of backrest lock fixing, which is not specifically limited in this solution. The rear seat of the vehicle includes at least one backrest, in which case the backrest can be connected to the adjacent backrest or the vehicle body by the backrest lock, and the adjacent backrest or the vehicle body can be provided with a latch B1, and the locking tongue 40 of the backrest lock can be stuck with the latch B1 to lock, or disengaged from the latch B1 to unlock.

[0064] It should be noted that the guard plate 90 may not be provided, and the fourth hinge shaft 504 and the fifth hinge shaft 505 may be directly fixed to the housing, and the housing may be fixed to the backrest at other positions. Of course, the connection method in the above embodiment makes it easier to disassemble the locking tongue 40 and the third connecting rod portion 30 from the housing, and the number of connection points can be reduced, thereby simplifying the structure.

[0065] It should also be emphasized that the present embodiment mainly utilizes the linkage mechanism to drive the lock tongue 40 to achieve unlocking and locking. The matching mode of the lock tongue 40 and the third link part 30 is not limited to the above-mentioned mode of meshing of the first lock tooth and the second lock tooth. The profiles of the two can be against each other at a certain position and achieve self-locking. For example, the lock tongue 40 is a cam structure, and the outer periphery of the third link part 30 can be against it to achieve self-locking. When the third link part 30 is disengaged with the rotation of the linkage mechanism, the lock tongue 40 rotates away from the self-locking position and unlocks. The working process can be understood with reference to the above, and no further description is given. Of course, the locking effect is obviously more reliable when the lock teeth are meshed and locked. In addition, the lock tongue 40 is not limited to being hinged to the housing. For example, the lock tongue 40 can also be slidably set on the housing, and the third link part 30 pushes the lock tongue 40 to clamp the latch B1 when it moves. Of course, the above-mentioned setting mode of hinged rotation of the lock tongue 40 is easy to be designed as self-locking when it cooperates with the third link part 30, so as to ensure that the locked state is maintained.

[0066] Secondly, in the above embodiments, the connecting rod mechanism, the lock tongue 40, the operating part, etc. are all arranged in the shell. The shell is not limited to the first shell 100 and the second shell 200 formed by snapping together. It can be a relatively complete shell, or there is an opening on one side, etc., or even no shell is provided. For example, the backrest lock can be directly located inside the backrest frame, and the backrest frame serves as the mounting base of the backrest lock component.

[0067] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Backrest lock, characterized in that: The invention comprises a locking tongue (40), a connecting rod mechanism, and an operating unit for driving the connecting rod mechanism to move; the connecting rod mechanism comprises a first connecting rod portion (10), a second connecting rod portion (20), and a third connecting rod portion (30) which are hinged in sequence, and the first connecting rod portion (10) and the third connecting rod portion (30) can also rotate around a separately provided hinge point respectively; when in a locked position, the third connecting rod portion (30) and the locking tongue (40) are locked in cooperation, the operating unit drives the connecting rod mechanism to move, and the third connecting rod portion (30) moves accordingly and is separated from the locking tongue (40); The first connecting rod portion (10) rotates clockwise to pull the second connecting rod portion (20) to drive the third connecting rod portion (30) to rotate clockwise; one end of the third connecting rod portion (30) is hinged to the second connecting rod portion (20) at a third hinge shaft (503), and the end of the third connecting rod portion (30) opposite to the third hinge shaft (503) is hinged to the housing of the backrest lock at a fourth hinge shaft (504); The locking tongue (40) can also rotate around a corresponding hinge point, and the hinge axis is parallel to each hinge axis of the connecting rod mechanism; The locking tongue (40) is provided with a first locking tooth, and the third connecting rod portion (30) has a second locking tooth, and when locked, the first locking tooth and the second locking tooth are meshed; The lock tongue (40) is provided with a torsion spring, which drives the first lock tooth to engage with the second lock tooth. When the link mechanism is actuated to cause the third link part (30) to disengage from the lock tongue (40), the torsion spring drives the lock tongue (40) to rotate clockwise to unlock.

2. The backrest lock according to claim 1, characterized in that: At least one of the first link portion (10) and the third link portion (30) is provided with a torsion spring for preventing rotation in an unlocking direction.

3. The backrest lock according to any one of claims 1 to 2, characterized in that: It also comprises a shell, wherein the first connecting rod portion (10), the third connecting rod portion (30) and the locking tongue (40) are all hinged to the shell to form corresponding hinge points.

4. The backrest lock according to claim 3, characterized in that: It also includes a guard plate (90) located in the housing, and the third connecting rod portion (30) and the locking tongue (40) are both hinged to the guard plate.

5. The backrest lock according to claim 4, characterized in that: It also includes a shell for mounting the locking tongue (40), the connecting rod mechanism, and the guard plate (90); the hinge shaft of the third connecting rod portion (30) and the locking tongue (40) has a through hole that penetrates along the axial direction, allowing a fastener to be inserted and pass through the shell.

6. The backrest lock according to any one of claims 1 to 2, characterized in that: The operating portion drives the first connecting rod portion (10) to rotate, thereby driving the second connecting rod portion (20) to move, and then driving the third connecting rod portion (30) to rotate around its hinge point.

7. The backrest lock according to any one of claims 1 to 2, characterized in that: It also comprises an indicator (80), wherein the indicator (80) is arranged in linkage with the connecting rod mechanism or the locking tongue (40), and when unlocking and / or locking, the indicator (80) is actuated to give an unlocking or locking indication.

8. A motor vehicle, including a rear seat, characterized in that The rear seat comprises at least one backrest, which is connected to an adjacent backrest or a vehicle body via a backrest lock as described in any one of claims 1 to 7, and the adjacent backrest or the vehicle body is provided with a latch, and the lock tongue (40) of the backrest lock can engage the latch (B1) to lock, or disengage from the latch (B1) to unlock.

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