Seat back lock

Abstract

The utility model discloses a seat backrest lock and relates to the technical field of seat lock catches, the seat backrest lock is used for being matched with a lock ring of a seat in an unlocking mode, the seat backrest lock further comprises a shell, an unlocking piece and a locking assembly, the shell is provided with a mounting cavity with a notch, and the notch is communicated with the mounting cavity; the unlocking sheet is rotationally mounted on the inner wall of the mounting cavity; the locking assembly is rotationally installed in the installation cavity, a limiting protrusion is arranged on one side of the locking assembly, the limiting protrusion protrudes towards the unlocking piece and abuts against the edge of the unlocking piece, at least one locking groove is formed in the side, back to the limiting protrusion, of the locking assembly at intervals, and the at least one locking groove is distributed along the movement path of the locking ring; wherein the unlocking piece can drive the locking assembly to rotate and is separated from the locking ring; the seat backrest lock has two motion states, and when the locking assembly and the lock ring are in the disengaged state, the unlocking piece and the locking assembly are disengaged from abutting; when the locking assembly is in contact with the locking ring, the unlocking piece abuts against the locking assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to chair lock technology field, especially relate to a seat backrest lock. BACKGROUND

[0002] The seat backrest lock is a device for fixing the position of the seat backrest, usually used in car seats to ensure the safety and comfort of passengers during driving or use. By locking the backrest on the lock ring of the body frame position of the rear seat, the seat backrest can be folded forward by cooperating with the lock ring to increase the storage space inside the car and meet the demand of multifunctional use.

[0003] In the related art, the seat backrest lock is usually equipped with two adjustment gears, and the lock ring is pushed into the two gears to adjust the angle of the backrest according to the preference of the passenger. The lock ring is usually arranged in a U-shaped manner, and the locking groove cooperating with the lock ring realizes the locking function, and each locking groove corresponds to an adjustment gear. The lock ring will enter the first gear and the second gear of the seat backrest lock in turn. However, if the operation is improper, the lock ring may skip the first gear and be locked directly in the second gear, which may cause the backrest seat lock to be locked only in the first gear, losing the significance of adjusting the backrest angle in two gears, and affecting the comfort of riding. SUMMARY

[0004] The main purpose of the utility model is to provide a seat backrest lock, which aims to solve the technical problem that the seat backrest lock in the related art cannot be locked in the first gear of the backrest.

[0005] To achieve the above purpose, the utility model provides a seat backrest lock for locking with the lock ring of the seat, one end of the seat backrest lock is connected with the pull rod, and in an embodiment, the seat backrest lock further comprises:

[0006] The shell is provided with a notched mounting cavity, and the notches are communicated with the mounting cavity;

[0007] The unlocking piece is rotatably installed in the mounting cavity;

[0008] The locking assembly is rotatably installed on the inner wall of the mounting cavity, one side of the locking assembly is provided with a limiting protrusion, the limiting protrusion protrudes towards the direction of the unlocking piece and abuts with the edge of the unlocking piece, and at least one locking groove is spaced apart from the side of the locking assembly away from the limiting protrusion, and the at least one locking groove is distributed along the movement path of the lock ring;

[0009] The unlocking piece can drive the locking assembly to rotate and disengage from the lock ring; the seat backrest lock has two movement states, in the state that the locking assembly is disengaged from the lock ring, the unlocking piece is disengaged from the locking assembly; in the state that the locking assembly is in contact with the lock ring, the unlocking piece is in contact with the locking assembly.

[0010] In an embodiment, the edge of the unlocking piece has an arc-shaped section, which is arranged close to one end of the locking piece and in contact with the limiting protrusion; and / or, a torsion spring is further arranged between the unlocking piece and the inner wall of the mounting cavity.

[0011] In an embodiment, the locking assembly comprises a locking piece and a locking tongue which rotate coaxially, the locking tongue and the locking piece are respectively rotatably installed on the inner wall of the mounting cavity, the locking piece is provided with the limiting protrusion on the side facing the unlocking piece, and the locking tongue is provided with at least one locking groove at intervals.

[0012] In an embodiment, the edge of the unlocking piece has an arc-shaped section, which is arranged close to one end of the locking piece and in contact with the limiting protrusion;

[0013] One end of the locking piece is formed with a bending section, and the arc-shaped section is recessed inward along the outer peripheral edge of the arc-shaped section to form a limiting clamping groove close to one end of the bending section, and the bending section is configured to limit the cooperation between the bending section and the limiting clamping groove when the locking piece is in contact with the unlocking piece.

[0014] In an embodiment, the locking piece is provided with a through groove, and one end of the locking tongue is formed with a connecting column which is limited in the through groove.

[0015] In an embodiment, the first section is rotatably connected to the locking piece through a torsion spring, the second section is sleeved on the connecting column, and the first section and the second section rotate coaxially.

[0016] In an embodiment, the locking assembly further comprises an abutting support which is rotatably connected to the bottom wall of the mounting cavity, a torsion spring is further arranged between the abutting support and the bottom wall of the mounting cavity, and the abutting support is in contact with the inner wall of the mounting cavity close to the abutting support, the abutting support and the locking tongue abut to form a limiting space for the limiting lock ring, and part of the structure of the abutting support is exposed in the gap.

[0017] In an embodiment, the abutting support has an abutting section which forms a boss in the direction away from the bottom wall of the mounting cavity, and the locking tongue is provided with a protrusion on the side facing the abutting support, and the protrusion is in contact with the boss.

[0018] In an embodiment, the abutting support is installed in the mounting cavity through a fixing pin.

[0019] In an embodiment, the locking assembly further comprises a washer and a fixing pin, the locking tongue and the locking piece are sequentially sleeved on the fixing pin, and the washer is located between the locking tongue and the locking piece and is sleeved on the fixing pin.

[0020] The technical scheme of the utility model provides with the limiting protrusion on the locking assembly, when the lock ring quickly enters the backrest lock, the locking assembly rotates, the limiting protrusion on the locking assembly rotates, and the limiting protrusion contacts the edge of the unlocking piece in the rotating process, thereby limiting the locking piece to continue rotating, the tip of the locking assembly limits the lock ring to continue entering the lock, thereby preventing the lock ring from directly entering the locking groove on the most inner side of the movement path of the lock ring opened by the locking assembly without rotating the unlocking piece. The above setting mode reduces the problem that the seat lock is directly locked into the most inner locking groove, i.e. the second gear, due to operation error, affecting the riding comfort. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structures shown in these drawings without creative labor.

[0022] Figure 1 The utility model provides a structure schematic diagram of seat backrest lock;

[0023] Figure 2 The utility model provides an explosion view of seat backrest lock;

[0024] Figure 3 The utility model provides a structure schematic diagram of locking piece;

[0025] Figure 4 The utility model provides a structure schematic diagram of unlocking piece;

[0026] Figure 5 The utility model provides a structure schematic diagram of abutting support;

[0027] Figure 6 The utility model provides a rotating direction schematic diagram of seat backrest lock.

[0028] EXPLANATION OF DRAWINGS:

[0029] 1000, seat backrest lock; 1, shell; 11, mounting cavity; 2, unlocking piece; 21, arc segment; 22, limiting clamping groove; 3, locking assembly; 31, locking piece; 311, limiting protrusion; 312, through groove; 313, bending segment; 32, lock tongue; 33, abutting support; 331, abutting segment; 332, boss; 34, gasket.

[0030] The realization, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0032] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0033] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B simultaneously meet the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0034] The utility model provides a kind of seat backrest lock 1000.

[0035] Please refer to Figures 1 to 5In an embodiment of the utility model, this seat backrest lock is used for unlocking cooperation with the lock ring of seat, seat backrest lock still includes casing 1, unlocking sheet 2 and locking assembly 3, casing 1 is set with the installation cavity 11 of notch, the notch is communicated with the installation cavity 11, unlocking sheet 2 is rotatably installed on the inner wall of installation cavity 11, locking assembly 3 is rotatably installed in installation cavity 11, one side of locking assembly 3 is equipped with limit protrusion 311, limit protrusion 311 protrudes towards the direction of unlocking sheet 2, and abuts with the edge of unlocking sheet 2, at least one locking slot is spaced apart on the side of locking assembly 3 away from limit protrusion 311, and at least one locking slot is distributed along the movement path of lock ring, wherein unlocking sheet 2 can drive locking assembly 3 to rotate and separate from lock ring, seat backrest lock has two movement states, in the state that locking assembly 3 separates from lock ring, unlocking sheet 2 separates from locking assembly 3 and abuts, in the state that locking assembly 3 contacts lock ring, unlocking sheet 2 abuts with locking assembly 3.

[0036] In the embodiment, seat backrest lock is mainly used for locking with the lock ring of rear seat of car, so that seat backrest can be laid down or folded up to adapt to different seating and storage requirements. Locking assembly 3 is used to realize the separation and abutment of seat backrest and lock ring, and unlocking sheet 2 is used to drive and limit locking assembly 3. Unlocking sheet 2 is rotatably installed on the inner wall of installation cavity 11, which can be fixed to the inner wall of installation cavity 11 by sleeving a fixed pin, and the fixed pin is a rivet, a screw, etc. Limit protrusion 311 is formed on one side of locking assembly 3 and protrudes towards unlocking sheet 2. The locking slot is used to lock the lock ring and is distributed along the movement path of the lock ring. It can be understood that at least one locking slot is provided on the side of locking assembly 3 away from limit protrusion 311, and the number of locking slots is not limited, and two locking slots are preferably provided. The locking slot is distributed along the movement path of the lock ring, and when the lock ring enters the backrest lock, it will first contact the outermost locking slot and finally contact the innermost locking slot. The notch is the necessary entry space of the movement path of the lock ring. When the backrest lock ring is pushed into the backrest lock to realize the locking operation, the lock ring sequentially abuts and contacts a locking slot. Since the lock ring continues to advance and releases the locking assembly 3 to rotate counterclockwise towards the innermost locking slot, the lock ring has a risk of directly sliding into the second locking slot during the above process. In order to avoid the occurrence of the above risk, when the lock ring enters the locking assembly 3 towards the outermost locking slot of the lock ring movement path, i.e. the first gear, since one end of the locking assembly 3 is provided with a limit protrusion 311, the limit protrusion 311 abuts with the unlocking sheet 2 to limit the rotation of the locking sheet 31, so that the lock ring of the seat backrest cannot be directly pushed into the innermost locking slot of the lock ring path, i.e. the second gear. Further, the driving mode of the unlocking sheet 2 includes but is not limited to manual and electric modes, which is not limited here. It can be understood that the unlocking sheet 2 is driven by a driving mechanism, and the driving mechanism includes but is not limited to a manual driving mechanism and an electric driving mechanism. Figure 6 The double-headed arrow indicates the clockwise rotation direction, which drives the locking assembly 3 to rotate counterclockwiseFigure 6 The double-headed arrow indicates clockwise rotation, i.e., unlocking of the lock ring. Figure 6 The double-headed arrow indicates clockwise rotation, i.e., unlocking of the lock ring.

[0037] The technical solution of the utility model sets a limiting protrusion 311 on the locking assembly 3, when the lock ring quickly enters the backrest lock, the locking assembly 3 rotates, the limiting protrusion 311 on the locking assembly 3 rotates, and in the rotating process, the limiting protrusion 311 contacts the edge of the unlocking sheet 2, thereby limiting the rotation of the locking sheet 31, the tip of the locking assembly 3 limits the lock ring from entering the locking groove on the inside of the movement path of the lock ring, thereby preventing the lock ring from directly entering the locking groove on the inside of the movement path of the lock ring without rotating the unlocking sheet 2. The above setting reduces the problem of the seat lock directly entering the locking groove on the inside, i.e., the second gear, due to operation errors, affecting the comfort of riding.

[0038] In an embodiment of the utility model, the edge of the unlocking sheet 2 has an arc section 21, which is arranged close to one end of the locking sheet 31 and abuts against the limiting protrusion 311.

[0039] And / or, a torsion spring is arranged between the unlocking sheet 2 and the inner wall of the mounting cavity 11.

[0040] In this embodiment, the unlocking sheet 2 is arranged on the locking assembly 3. Figure 4 It can be understood that the arc section 21 of the unlocking sheet 2 can effectively prevent the lock ring from being directly pushed into the double-locked position of the seat backrest lock. Correspondingly, the arc surface of the arc section 21 is arranged as a convex arc towards the limiting protrusion 311. It can be understood that when the lock ring pushes the lock tongue 32 into any locking groove, since the unlocking sheet 2 and the locking sheet 31 are not in the same plane, the height of the unlocking sheet 2 is higher than the height of the locking sheet 31, and the existence of the arc section 21 can abut against the limiting protrusion 311, limiting the rotation of the locking sheet 31, so that the lock ring cannot be directly pushed into the second locking groove of the lock tongue 32, i.e., the second gear. The above setting helps to prevent the lock ring from being damaged by incorrect operation.

[0041] In this embodiment, the unlocking sheet 2 can return to the initial state under the action of the torsion spring, providing spring restoring force. It can be understood that when the external force disappears, the unlocking sheet 2 will return to the original position under the action of the torsion spring without external force, thereby driving the locking assembly 3 to rotate counterclockwise, i.e., locking of the lock ring. Figure 6 counterclockwise, i.e., locking of the lock ring.

[0042] In an embodiment of the utility model, locking assembly 3 includes coaxial rotation's locking piece 31 and lock tongue 32, lock tongue 32 rotates and is installed in installation cavity 11, locking piece 31 the side of facing unlocking piece 2 is equipped with limit protrusion 311, lock tongue 32 is equipped with at least one locking slot with interval.

[0043] In this embodiment, locking piece 31 is used to limit the locking function of the locking ring directly into the locking slot. Locking tongue 32 is used to cooperate with the locking ring to realize the locking of the seat. It can be understood that the locking tongue 32 can be installed in the installation cavity 11 by means of rotating shaft, elastic pin, fixed pin, etc. The locking tongue 32 rotates coaxially with the locking piece 31, and the locking piece 31 is installed above the locking tongue 32. It should be noted that when the locking ring is unlocked and locked with the backrest lock, the unlocking piece 2 is driven to rotate the locking piece 31. Since the locking piece 31 rotates coaxially with the locking tongue 32, the locking slot of the locking tongue 32 rotates clockwise with reference to the figure, that is, it is adapted to the movement path of the locking ring, so that the locking ring can enter the locking slot. Since the side of the locking piece 31 facing the unlocking piece 2 is provided with a limit protrusion 311, the limit protrusion 311 abuts against the unlocking piece 2, thereby limiting the rotation of the locking piece 31, so that the locking ring cannot be directly pushed into the innermost locking slot of the locking tongue 32, and it is ensured that the locking ring enters the locking slot in sections.

[0044] In an embodiment of the utility model, the edge of the unlocking piece 2 has an arc segment 21, which is arranged near one end of the locking piece 31 and abuts against the limit protrusion 311; one end of the locking piece 31 is formed with a bending segment 313, the arc segment 21 is recessed inward along the outer peripheral edge of the arc segment 21 to form a limit clamping groove 22 at one end of the arc segment 21 near the bending segment 313, and the bending segment 313 is configured to limit the cooperation between the bending segment 313 and the limit clamping groove 22 when the locking piece 31 abuts against the unlocking piece 2.

[0045] In this embodiment, the cooperation between the bending segment 313 and the limit clamping groove 22 ensures that the unlocking piece 2 and the locking piece 31 will not rotate excessively. Correspondingly, one end of the locking piece 31 is bent towards the unlocking piece 2. It can be understood that the height of the locking piece 31 is not in the same plane as the height of the unlocking piece 2, and the height of the locking piece 31 is lower than the height of the unlocking piece 2. During the process of the locking ring entering and pushing the locking tongue 32 to rotate, the limit clamping groove 22 of the arc segment 21 is always limited by the bending segment 313, thereby ensuring that the locking piece 31 and the unlocking piece 2 will not rotate excessively. The above arrangement ensures the stability and reliability of the structure.

[0046] In an embodiment of the utility model, the locking piece 31 is provided with a through slot 312, and one end of the locking tongue 32 is formed with a connecting column which is limited in the through slot 312.

[0047] In the embodiment, the through slot 312 is used to guide and position the connecting column, so as to ensure smooth and accurate movement of the connecting column in the locking piece 31, thereby ensuring the reliability and stability of the lock. Preferably, in order to adapt to the movement of the connecting column in the through slot 312, the shape of the through slot 312 is preferably a waist-shaped slot, because the inner walls thereof are all arc surfaces, the direct contact and friction between the connecting column and the locking piece 31 can be reduced, thereby reducing wear. Correspondingly, the lock tongue 32 is provided with a through hole for the connecting column, the connecting column passes through the through hole and is limited in the through slot 312. And with the rotation of the locking piece 31, the lock tongue 32 is driven to rotate. The above-mentioned arrangement mode can reduce the complexity of the lock through the simple cooperation of the waist-shaped slot and the connecting column, reduce the manufacturing cost, and at the same time maintain the function of the lock.

[0048] In an embodiment of the utility model, the lock tongue 32 includes a first section and a second section, the first section is rotationally connected with the locking piece 31 through a torsion spring, and the connecting column is sequentially sleeved with the second section and the first section.

[0049] In the embodiment, the above-mentioned arrangement mode can increase the contact area between the lock tongue 32 and the lock ring, thereby improving the stability of the lock tongue 32 in the lock body and reducing displacement or falling caused by external force.

[0050] In an embodiment of the utility model, the locking assembly 3 further includes an abutting support 33, the abutting support 33 is rotationally connected with the bottom wall of the mounting cavity 11, a torsion spring is further arranged between the abutting support 33 and the bottom wall of the mounting cavity 11 and abuts against the inner wall of the mounting cavity 11 close to the side of the abutting support 33, the abutting support 33 and the lock tongue 32 abut to form a limiting space for the limiting lock ring, and part of the structure of the abutting support 33 is exposed in the gap.

[0051] In combination Figure 5In the embodiment, it can be understood that the lock tongue 32 moves towards the bottom side of the mounting cavity 11 due to the torsion spring, and the abutting support 33 is arranged to limit the movement range of the lock tongue 32 to prevent the lock tongue 32 from being excessively locked with the lock ring. Accordingly, the limiting space is used to limit the movement position of the lock ring, thereby improving the accuracy and reliability of the locking. Further, when the abutting support 33 is in the normal state, the abutting support 33 abuts against the inner side wall of the mounting cavity 11, and the torsion force of the spring acting on the abutting support 33 is opposite to the torsion force of the torsion spring acting on the lock tongue 32, so that the lock tongue 32 and the abutting support 33 abut against each other. It should be noted that when the backrest is pushed into the lock ring for locking, the lock ring first pushes the abutting support 33, and the abutting support 33 releases the clockwise rotation of the lock tongue 32 towards the innermost locking groove, and the locking piece 31 rotates counterclockwise under the action of the spring towards the innermost locking groove of the lock tongue 32. At this time, the lock ring has a risk of directly sliding into the second gear during the rapid movement, in order to avoid this risk, the locking piece 31 is provided with a limiting protrusion 311 at one end thereof towards the unlocking piece 2, and the limiting protrusion 311 abuts against the unlocking piece 2 during the movement of the unlocking piece 2, thereby limiting the rotation of the locking piece 31, so that the lock ring needs to enter the locking groove in stages. In combination with Figure 5 It can be known that the abutting support 33 abuts against the inner side wall of the mounting cavity 11 in the initial state, and when the lock ring enters the backrest lock, that is, in the unlocked state, the lock ring pushes the abutting support 33 to rotate, that is, the abutting support 33 rotates counterclockwise with the lock tongue 32 abutting against each other in the unlocked state, and rotates clockwise with the lock tongue 32 abutting against each other in the locked state. Figure 6 The abutting support 33 rotates counterclockwise with the lock tongue 32 abutting against each other, and rotates clockwise with the lock tongue 32 abutting against each other; when the lock ring no longer moves into the backrest lock, that is, the lock ring and the lock tongue 32 are in the locked state, the abutting support 33 rotates clockwise with the lock tongue 32 abutting against each other due to the torsion spring, and returns to the original position. The above setting not only prevents the lock tongue 32 from moving excessively during unlocking, thereby avoiding excessive locking or jamming of the lock tongue 32 and the lock ring, but also ensures the stability of the lock tongue 32 during unlocking and locking, and reduces the vibration or swing caused by the torsion spring.

[0052] In an embodiment of the utility model, the abutting support 33 has an abutting section 331, the abutting section 331 forms a boss 332 in the direction away from the bottom wall of the mounting cavity 11, and the side of the lock tongue 32 facing the abutting support 33 is provided with a protrusion, and the protrusion abuts against the boss 332.

[0053] In combination with Figure 5In the embodiment, in order to further provide stable support for the locking tongue 32, the abutting section 331 forms a boss 332 abutting with the locking tongue 32 in a normal state, i.e. when the locking ring does not enter the locking groove of the locking tongue 32. It can be understood that the part of the locking tongue 32 abutting with the boss 332 is the common side wall of the two locking grooves abutting with the boss 332. The above arrangement provides accurate limiting effect, ensures that the locking tongue 32 is kept in the correct position when it is not locked by the locking ring, and avoids excessive movement or incorrect position caused by the torsion spring.

[0054] In an embodiment of the utility model, the abutting support 33 is installed in the installation cavity 11 through a fixing pin, and the torsion spring is located between the fixing pin and the abutting support 33.

[0055] In the embodiment, the above arrangement enhances the working reset reliability of the locking assembly 3 through the cooperation of the fixing pin and the torsion spring, so that the locking assembly 3 can be reliably reset after swinging.

[0056] In an embodiment of the utility model, the locking assembly 3 further comprises a washer 34 and a fixing pin, the locking tongue 32 and the locking piece 31 are sequentially sleeved on the fixing pin, the washer 34 is located between the locking tongue 32 and the locking piece 31 and is sleeved on the fixing pin.

[0057] In the embodiment, the washer 34 is used to reduce the direct contact and friction between the locking tongue 32 and the locking piece 31, so as to reduce the abrasion. At the same time, it is helpful to more evenly distribute the contact pressure between the locking tongue 32 and the locking piece 31, and reduce the local stress concentration. Correspondingly, the washer 34 is made of flexible material such as rubber. The fixing pin herein includes but is not limited to the form of screw, rivet and the like.

[0058] The above description is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A seat back lock for unlocking with a seat locking ring, characterized in that, The seat back lock also includes: The housing (1) has a notch in the mounting cavity (11) and the notch communicates with the mounting cavity (11); Unlocking piece (2), which is rotatably mounted in the mounting cavity (11); Locking assembly (3) is rotatably mounted on the inner wall of the mounting cavity (11). A limiting protrusion (311) is provided on one side of the locking assembly (3). The limiting protrusion (311) protrudes toward the unlocking piece (2) and abuts against the edge of the unlocking piece (2). At least one locking groove is provided on the side of the locking assembly (3) facing away from the limiting protrusion (311). At least one locking groove is distributed along the movement path of the lock ring. The unlocking piece (2) can drive the locking assembly (3) to rotate and disengage from the locking ring; the seat back lock has two movement states: in the state where the locking assembly (3) is disengaged from the locking ring, the unlocking piece (2) disengages from the locking assembly (3); in the state where the locking assembly (3) is in contact with the locking ring, the unlocking piece (2) abuts against the locking assembly (3).

2. The seat back lock as described in claim 1, characterized in that, The edge of the unlocking piece (2) has an arc-shaped segment (21), which is located near one end of the locking piece (31) and abuts against the limiting protrusion (311). And / or, a torsion spring is provided between the unlocking piece (2) and the inner wall of the mounting cavity (11).

3. The seat back lock as described in claim 1, characterized in that, The locking assembly (3) includes a locking plate (31) and a locking tongue (32) that rotate coaxially. The locking tongue (32) and the locking plate (31) are respectively rotatably mounted on the inner wall of the mounting cavity (11). The locking plate (31) has a limiting protrusion (311) on the side facing the unlocking plate (2). The locking tongue (32) has at least one locking groove spaced apart.

4. The seat back lock as described in claim 3, characterized in that, The edge of the unlocking piece (2) has an arc-shaped segment (21), which is located near one end of the locking piece (31) and abuts against the limiting protrusion (311). One end of the locking piece (31) has a bent section (313), and the end of the arc-shaped section (21) near the bent section (313) is recessed inward along the outer peripheral edge of the arc-shaped section (21) to form a limiting groove (22). The bent section (313) is configured to limit the engagement between the bent section (313) and the limiting groove (22) when the locking piece (31) abuts against the unlocking piece (2).

5. The seat back lock as described in claim 4, characterized in that, The locking piece (31) has a through groove (312), and one end of the locking tongue (32) forms a connecting post, which is located within the through groove (312).

6. The seat back lock as described in claim 5, characterized in that, The locking tongue (32) includes a first section and a second section. The first section is rotatably connected to the locking piece (31) via a torsion spring, and the second section is sleeved on the connecting post. The first section and the second section rotate coaxially.

7. The seat back lock as described in claim 3, characterized in that, The locking assembly (3) further includes an abutment bracket (33), which is rotatably connected to the bottom wall of the mounting cavity (11). A torsion spring is also provided between the abutment bracket (33) and the bottom wall of the mounting cavity (11), and abuts against the inner wall of the mounting cavity (11) near the abutment bracket (33). The abutment bracket (33) abuts against the locking tongue (32) to form a limiting space for the limiting locking ring. Part of the structure of the abutment bracket (33) is exposed in the notch.

8. The seat back lock as described in claim 7, characterized in that, The abutment bracket (33) has an abutment section (331), the abutment section (331) forms a boss (332) in the direction away from the bottom wall of the mounting cavity (11), the locking tongue (32) has a protrusion on the side facing the abutment bracket (33), the protrusion abuts against the boss (332).

9. The seat back lock as described in claim 8, characterized in that, The abutment bracket (33) is installed in the mounting cavity (11) by a fixing pin.

10. The seat back lock as described in claim 3, characterized in that, The locking assembly (3) further includes a washer (34) and a fixing pin. The locking tongue and the locking plate are sequentially sleeved on the fixing pin. The washer (34) is located between the locking tongue (32) and the locking plate (31) and is sleeved on the fixing pin.

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