A seat back unlocking mechanism and a seat

Abstract

This utility model relates to the field of automotive seat technology, specifically a seat back unlocking mechanism and seat, including: a press-down button assembly; an unlocking assembly, which is fixedly connected to the press-down button assembly; a snap-fit ​​assembly, including a fixed shaft and a fixed plate assembly, the fixed shaft being snap-fitted and fixed to the unlocking assembly; and a gas spring assembly, including a connecting end and a rotating end arranged opposite to each other, the connecting end being fixedly connected to the fixed plate assembly, and the rotating end being rotatably connected to the seat back; the connecting end of the gas spring assembly can rotate relative to the fixed shaft, and under the action of external force, the seat back can rotate relative to the armrest; the press-down button assembly of this utility model has high structural strength and is not easily deformed during use, ensuring the structural stability of the press-down button assembly, reducing the damage rate of the press-down button assembly, and reducing maintenance costs; the press-down button assembly has a clear pressing stroke, allowing users to quickly sense whether it is fully unlocked, thus improving the user experience.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a seat back unlocking mechanism and a seat. Background Technology

[0002] In car seat backrest adjustment mechanisms, the small wrench-type unlocking mechanism is a common mechanical unlocking solution. It releases the constraint of the gas spring or locking mechanism by swinging a small wrench, thereby adjusting the backrest angle. Specifically, this mechanism typically includes a small wrench, a linkage rod, and a locking component. The user manually moves the small wrench to move the linkage mechanism, releasing the backrest from its locked state. However, existing small wrench-type unlocking mechanisms have the following technical drawbacks in practical applications: First, the small wrench is usually located under or to the side of the seat cushion, is small in size, and its concealed position makes it easy to be obstructed by the seat cushion or the passenger's legs, making it difficult for the user to quickly locate and operate, affecting the user experience. Second, the small wrench is usually made of thin-walled stamped or injection-molded parts, which are prone to plastic deformation or even breakage after long-term stress, leading to unlocking failure and reducing the service life and reliability of the mechanism. Third, due to the limited swing range of the small wrench and the lack of a clear limiting structure, users find it difficult to perceive whether the unlocking is complete, which may result in incomplete unlocking or misoperation. Utility Model Content

[0003] To address the aforementioned technical issues, the push-button assembly in this invention is mounted on the armrest for easy operation. Furthermore, the push-button assembly boasts high structural strength, preventing deformation during use and ensuring structural stability. This reduces the damage rate and maintenance costs. More importantly, the push-button assembly has a precise pressing stroke, allowing users to quickly determine if the button is fully unlocked, thus enhancing the user experience.

[0004] This utility model provides a seat back unlocking mechanism, which is installed on a seat. The seat includes an armrest and a seat back. The seat back is rotatable relative to the armrest. The armrest is provided with a moving hole. The seat back unlocking mechanism includes:

[0005] A push-button assembly installed on the armrest;

[0006] An unlocking component is partially disposed within the movable hole. The unlocking component is fixedly connected to the press-down button component. Under the action of the press-down button component, the unlocking component can move along the movable hole.

[0007] The snap-fit ​​assembly provided on the handrail includes a fixed shaft and a fixed plate assembly connected to each other, wherein the fixed shaft is snap-fitted and fixed to the unlocking assembly.

[0008] A gas spring assembly includes a connecting end and a rotating end disposed opposite to each other. The connecting end is fixedly connected to the fixed plate assembly, and the rotating end is rotatably connected to the seat back. The pressing button assembly can drive the unlocking assembly to move away from the fixed axis until the unlocking assembly disengages from the fixed axis. The connecting end of the gas spring assembly can rotate relative to the fixed axis. Under the action of external force, the seat back can rotate relative to the armrest.

[0009] Furthermore, the unlocking component includes a connecting rod and a hook structure;

[0010] The first end of the connecting rod is fixedly connected to the press-down button assembly, and the second end of the connecting rod is fixedly connected to the hook structure;

[0011] The hook structure is engaged and fixed with the fixed shaft.

[0012] Furthermore, the hook structure includes a connecting part and a hook part that are interconnected;

[0013] The connecting part is fixedly connected to the second end of the connecting rod, the hook part is bent toward the fixed shaft, and the hook part can be engaged and fixed with the fixed shaft.

[0014] Furthermore, the fixing plate assembly includes a first fixing plate and a second fixing plate fixedly connected, the first fixing plate and the second fixing plate are disposed opposite to each other, there is a gap between the first fixing plate and the second fixing plate, and an accommodating space is formed between the first fixing plate and the second fixing plate.

[0015] Furthermore, the fixing plate assembly also includes a third fixing plate, which is disposed between the first fixing plate and the second fixing plate, and is used to fix the first fixing plate and the second fixing plate together.

[0016] Furthermore, the first fixing plate, the second fixing plate, and the third fixing plate are connected to form a U-shaped structure, and the first fixing plate, the second fixing plate, and the third fixing plate are integrally formed or separately formed.

[0017] Furthermore, the fixed shaft includes a first fixed end and a second fixed end disposed opposite to each other;

[0018] The first fixed end can be fixedly connected to the handrail, and the second fixed end passes through the first fixed plate and the second fixed plate in sequence, and the second fixed end is rotatably connected to the first fixed plate and the second fixed plate respectively.

[0019] Furthermore, a hook structure is disposed below the fixed shaft, the hook structure being able to extend into the receiving space and engage with the side wall of the fixed shaft disposed in the receiving space.

[0020] Furthermore, the connecting end of the gas spring assembly is detachably connected to the third connecting plate.

[0021] This utility model also protects a seat, including a seat back, armrests and a seat back unlocking mechanism as described above;

[0022] The seat back unlocking mechanism is located on the armrest, and the seat back is rotatably connected to the armrest through the seat back unlocking mechanism.

[0023] Implementing the embodiments of this utility model has the following beneficial effects:

[0024] This invention achieves rapid unlocking and locking of the armrest and seat back by incorporating a cooperating push-button assembly, unlocking assembly, locking assembly, and gas spring assembly on the armrest. Furthermore, by integrating the unlocking assembly, locking assembly, and gas spring assembly within the armrest, the seat dimensions are optimized, enhancing the aesthetics of the seat with the backrest unlocking mechanism. The push-button assembly, conveniently located on the armrest, boasts high structural strength, preventing deformation during use, ensuring structural stability, reducing damage rates, and lowering maintenance costs. Most importantly, the push-button assembly provides a precise downward stroke, allowing users to quickly perceive whether the armrest is fully unlocked, thus improving the user experience. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this utility model. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0026] Figure 1 This is a structural diagram of the seat back unlocking mechanism and the armrest as described in this embodiment.

[0027] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0028] The corresponding reference numerals in the figure are as follows:

[0029] 1-Press button assembly; 2-Unlock assembly; 3-Snap-fit ​​assembly; 4-Gas spring assembly; 5-Handrail; 21-Connecting rod; 22-Hook structure; 31-First fixing plate; 32-Second fixing plate; 33-Fixed shaft; 41-Connecting end; 42-Rotating end; 51-Moving hole. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] See appendix Figures 1-2This embodiment provides a seat back unlocking mechanism, which is installed on a seat. The seat includes an armrest 5 and a seat back. The seat back can rotate relative to the armrest 5. The armrest 5 is provided with a moving hole 51. The seat back unlocking mechanism includes: a press-down button assembly 1 installed on the armrest 5; an unlocking component 2 partially disposed in the moving hole 51, the unlocking component 2 being fixedly connected to the press-down button assembly 1, and the unlocking component 2 being able to move along the moving hole 51 under the action of the press-down button assembly 1; a snap-fit ​​assembly 3 disposed on the armrest 5, including a fixed shaft 33 and a fixed plate assembly connected to each other, the fixed shaft 33 being snap-fitted and fixed to the unlocking component 2; a gas spring assembly 4, including a connecting end 41 and a rotating end 42 disposed opposite to each other, the connecting end 41 being fixedly connected to the fixed plate assembly, and the rotating end 42 being rotatably connected to the seat back; the press-down button assembly 1 can drive the unlocking component 2 to move away from the fixed shaft 33 until the unlocking component 2 disengages from the fixed shaft 33. The connecting end 41 of the gas spring assembly 4 can rotate relative to the fixed shaft 33. Under the action of external force, the seat back can rotate relative to the armrest 5. This utility model achieves the effect of quickly unlocking and locking the armrest 5 and the seat back by setting the mutually cooperating pressing button assembly 1, unlocking assembly 2, locking assembly 3 and gas spring assembly 4 on the armrest 5. At the same time, setting the unlocking assembly 2, locking assembly 3 and gas spring assembly 4 inside the armrest 5 can optimize the seat size and improve the aesthetics of the seat with the seat back unlocking mechanism. Furthermore, the pressing button assembly 1 is set on the armrest 5, which is convenient to operate. The pressing button assembly 1 has a high structural strength, which ensures that the pressing button assembly 1 is not easily deformed during use, ensures the structural stability of the pressing button assembly 1, reduces the damage rate of the pressing button assembly 1, and reduces maintenance costs. More importantly, the pressing button assembly 1 has a clear pressing stroke, and the user can quickly feel whether it is unlocked, thus improving the user experience.

[0034] In this embodiment, the connections of each component in the seat back unlocking mechanism are as follows: the press button assembly 1 protrudes from the surface of the armrest 5, one end of the press button assembly 1 is located inside the armrest 5, and one end of the press button assembly 1 is fixedly connected to the first end of the connecting rod 21 of the unlocking assembly 2, the second end of the connecting rod 21 of the unlocking assembly 2 is fixedly connected to the hook structure 22, the first fixed end of the fixed shaft 33 is fixedly connected to the armrest 5, the second fixed end of the fixed shaft 33 is rotatably connected to the fixed plate assembly, the hook structure 22 is snapped and fixed to the fixed shaft 33, the connecting end 41 of the gas spring assembly 4 is fixedly connected to the fixed plate assembly, and the rotating end of the gas spring assembly 4 is rotatably connected to the seat back.

[0035] It is understandable that the seat back can rotate relative to the armrest 5 after the seat back unlocking mechanism is unlocked. Specifically, the operator presses down the press button assembly 1, which drives the connecting rod 21 and the hook structure 22 to move downward. The hook structure 22 switches from being locked to the fixed shaft 33 to being disengaged from the fixed shaft 33. At this time, the fixed plate assembly fixedly connected to the connecting end 41 can rotate relative to the fixed shaft 33. At this time, the gas spring assembly 4 is unlocked. Under the action of external force, the seat back rotates relative to the armrest 5 and the rotating end 42 of the gas spring assembly 4 by the required angle.

[0036] In this embodiment, the armrest 5 has a pressing groove that communicates with the moving hole 51. Part of the pressing button assembly 1 protrudes from the pressing groove, while another part of the pressing button assembly 1 is disposed in the pressing groove and fixedly connected to the connecting rod 21 disposed in the moving hole 51. The pressing button assembly 1 can reciprocate along the depth direction of the pressing groove. At the same time, when the pressing button assembly 1 moves relative to the pressing groove, the pressing button assembly 1 drives the connecting rod 21 to move within the moving hole 51. The depth direction of the pressing groove and the length direction of the moving hole 51 are consistent with the height direction of the seat.

[0037] In this embodiment, the press button assembly 1 includes a button assembly and a reset assembly. Along the height direction of the seat, the button assembly includes a pressing part and a connecting part connected to each other from top to bottom. The pressing part protrudes from the pressing groove, and the connecting part is connected to the connecting rod 21. A first abutting part is provided at the connection position between the pressing part and the connecting part. The reset assembly is sleeved on the connecting part and abuts against the first abutting part. A second abutting part is provided at the bottom of the pressing groove to cooperate with the first abutting part. The reset assembly abuts against the second abutting part. The reset assembly is an elastic structure that can be compressed or extended, preferably a reset spring.

[0038] Specifically, when the reset component is in a fully compressed state, the button assembly 1 is pressed to the first limit position, at which point the unlocking component 2 disengages from the locking component 3, and the gas spring assembly 4 is in an unlocked state; when the reset component is in an uncompressed state, the button assembly 1 is in the initial second limit position, at which point the unlocking component 2 and the locking component 3 are locked together, and the gas spring assembly 4 is in a locked state.

[0039] Specifically, the operator can press the down button component 1 to switch the down button component 1 from the second limit position to the first limit position. Since the reset component is in a fully compressed state when it is in the first limit position, the down button component 1 cannot be pressed down further, so that the user can quickly feel whether it is unlocked in place, thus improving the user experience.

[0040] In some possible embodiments, the unlocking component 2 includes a connecting rod 21 and a hook structure 22; the first end of the connecting rod 21 is fixedly connected to the press button component 1, and the second end of the connecting rod 21 is fixedly connected to the hook structure 22; the hook structure 22 is engaged and fixedly connected to the fixed shaft 33. By setting the connecting rod 21 and the hook structure 22 that cooperate with each other, the press button component 1 can drive the hook structure 22 to engage and lock or disengage from the engagement component 3 through the connecting rod 21, thereby ensuring that the force of the press button component 1 can be transmitted to the engagement component 3, thereby improving the response speed and operational stability of unlocking or locking.

[0041] In this embodiment, the axial direction of the connecting rod 21 is parallel to the thickness direction of the handrail 5.

[0042] In some possible embodiments, the latch structure 22 includes a connecting part and a latch part that are connected to each other; the connecting part is fixedly connected to the second end of the connecting rod 21, the latch part is bent toward the fixed shaft 33, and the latch part can be latched and fixed with the fixed shaft 33. By setting the latch part to be bent toward the fixed shaft 33, it can be ensured that the latch part can be disengaged from the fixed shaft 33 when the button assembly 1 is pressed down by the operator, which further improves the unlocking response speed. At the same time, when the operator removes the external force, the latch part can be quickly latched and fixed with the fixed shaft 33, which further improves the locking response speed.

[0043] In this embodiment, the hook structure 22 is a U-shaped structure, that is, the connecting part and the hook part are connected to each other to form a U-shaped structure.

[0044] In some possible embodiments, the fixing plate assembly includes a first fixing plate 31 and a second fixing plate 32 fixedly connected. The first fixing plate 31 and the second fixing plate 32 are disposed opposite to each other, with a gap between them. A receiving space is formed between the first fixing plate 31 and the second fixing plate 32. By setting the first fixing plate 31 and the second fixing plate 32 and forming a receiving space between them, the hook portion can be guided and limited, which to a certain extent ensures the stability of the hook portion and the fixing shaft 33, thereby ensuring the stability of locking the seat back.

[0045] In this embodiment, the hook portion of the hook structure 22 is disposed within the receiving space and is engaged and fixed with the fixed shaft 33.

[0046] In some possible embodiments, the fixing plate assembly further includes a third fixing plate disposed between the first fixing plate 31 and the second fixing plate 32. The third fixing plate is used to fix the first fixing plate 31 and the second fixing plate 32 together. By providing the third fixing plate, the stability of the connection between the first fixing plate 31 and the second fixing plate 32 can be improved.

[0047] In some possible embodiments, the first fixing plate 31, the second fixing plate 32 and the third fixing plate are connected to form a U-shaped structure. The first fixing plate 31, the second fixing plate 32 and the third fixing plate are integrally formed or separately set. By setting the first fixing plate 31, the second fixing plate 32 and the third fixing plate to a U-shaped structure, it is possible to form a accommodating space that can be limited, and the stability of its connection with the gas spring assembly 4 can be ensured by setting the third fixing plate.

[0048] Preferably, the first fixing plate 31, the second fixing plate 32 and the third fixing plate are integrally formed to form a U-shaped structure, and the sealed end of the U-shaped structure is set towards the gas spring assembly 4.

[0049] In some possible embodiments, the fixed shaft 33 includes a first fixed end and a second fixed end disposed opposite to each other; the first fixed end can be fixedly connected to the armrest 5, and the second fixed end passes through the first fixed plate 31 and the second fixed plate 32 in sequence. The second fixed end is rotatably connected to the first fixed plate 31 and the second fixed plate 32 respectively. The above arrangement can ensure that the first fixed plate 31 and the second fixed plate 32 can rotate relative to the fixed shaft 33 while being fixedly connected to the armrest 5, thereby ensuring that the connecting end 41 of the gas spring assembly 4 can rotate relative to the fixed shaft 33, so as to unlock the gas spring assembly 4 and ensure the stability of the seat back unlocking mechanism.

[0050] In this embodiment, the axial direction of the fixed shaft 33 is parallel to the axial direction of the connecting rod 21.

[0051] In some possible embodiments, the hook structure 22 is disposed below the fixed shaft 33. The hook structure 22 can extend into the receiving space and engage with the side wall of the fixed shaft 33 disposed in the receiving space. By disposing of the hook structure 22 in the receiving space, the hook structure 22 can be limited, ensuring the stability of the hook structure 22 and the fixed shaft 33 in the engagement.

[0052] In this embodiment, the size of the hook structure 22 is not limited. As long as the hook structure 22 disengages from the fixed shaft 33 when the button assembly 1 is pressed to the first limit position, and the hook structure 22 is engaged and fixed with the fixed shaft 33 when the button assembly 1 is in the initial second limit position.

[0053] In some possible embodiments, the connecting end 41 of the gas spring assembly 4 is detachably connected to the third connecting plate. By detachably connecting the connecting end 41 of the gas spring assembly 4 to the third connecting plate, the installation speed of the gas spring assembly 4 can be improved while ensuring the installation stability of the gas spring assembly 4.

[0054] In some possible embodiments, the third connecting plate is provided with a threaded hole, the connecting end 41 of the gas spring assembly 4 is provided with an external thread that mates with the threaded hole, and a nut is fitted on the connecting end 41. The connecting end 41 is threadedly connected to the third connecting plate. After the connecting end 41 is connected to the third connecting plate, the nut on the connecting end 41 is screwed on until it abuts against the third connecting plate, so as to limit the position of the connecting end 41 and the third connecting plate.

[0055] Unlocking and locking process of the seat back adjustment mechanism: The operator presses down the button assembly 1, which drives the connecting rod 21 and the hook structure 22 to move downward. The hook structure 22 switches from being engaged with the fixed shaft 33 to being disengaged from the fixed shaft 33. At this time, the fixed plate assembly, which is fixedly connected to the connecting end 41, can rotate relative to the fixed shaft 33. At this time, the gas spring assembly 4 is unlocked. Under the action of external force, the seat back can rotate relative to the armrest 5 and the rotating end 42 of the gas spring assembly 4 by the required angle. The operator releases the button assembly 1 and removes the external force. The reset assembly drives the button assembly to move in the opposite direction to reset the button assembly 1. The button assembly 1 drives the connecting rod 21 and the hook structure 22 to move upward. The hook structure 22 switches from being disengaged from the fixed shaft 33 to being engaged with the fixed shaft 33. At this time, the gas spring assembly 4 is in the locked state. At this time, the seat back cannot rotate relative to the armrest 5, and the seat back is in the locked state.

[0056] This utility model also protects a seat, including a seat back, an armrest 5, and the aforementioned seat back unlocking mechanism. The seat back unlocking mechanism is disposed on the armrest 5, and the seat back is rotatably connected to the armrest 5 through the seat back unlocking mechanism. The seat with the seat back unlocking mechanism can achieve the effect of quickly unlocking and locking the armrest 5 and the seat back by setting a mutually cooperating pressing button assembly 1, unlocking assembly 2, locking assembly 3, and gas spring assembly 4 on the armrest 5. At the same time, setting the unlocking assembly 2, locking assembly 3, and gas spring assembly 4 inside the armrest 5 can optimize the seat size and improve the aesthetics of the seat with the seat back unlocking mechanism. Furthermore, the pressing button assembly 1 is disposed on the armrest 5 for easy operation, and the pressing button assembly 1 has high structural strength, ensuring that the pressing button assembly 1 is not easily deformed during use, ensuring the structural stability of the pressing button assembly 1, reducing the damage rate of the pressing button assembly 1, and reducing maintenance costs. More importantly, the pressing button assembly 1 has a clear pressing stroke, and the user can quickly feel whether it is unlocked, thus improving the user experience.

[0057] It is understood that the implementations shown in the accompanying drawings are merely preferred examples of this application. In actual products, the above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0058] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0059] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A seat back unlocking mechanism, disposed on a seat, the seat including an armrest (5) and a seat back, the seat back being rotatable relative to the armrest (5), characterized in that, The armrest (5) is provided with a movable hole (51), and the seat back unlocking mechanism includes: A push-button assembly (1) is installed on the handrail (5); An unlocking component (2) is partially disposed within the movable hole (51). The unlocking component (2) is fixedly connected to the pressing button component (1). Under the action of the pressing button component (1), the unlocking component (2) can move along the movable hole (51). The snap-fit ​​assembly (3) provided on the handrail (5) includes a fixed shaft (33) and a fixed plate assembly connected to each other, wherein the fixed shaft (33) is snap-fitted to the unlocking assembly (2); The gas spring assembly (4) includes a connecting end (41) and a rotating end (42) arranged opposite to each other. The connecting end (41) is fixedly connected to the fixed plate assembly, and the rotating end (42) can be rotatably connected to the seat back. The pressing button assembly (1) can drive the unlocking assembly (2) to move away from the fixed shaft (33) until the unlocking assembly (2) is disengaged from the fixed shaft (33). The connecting end (41) of the gas spring assembly (4) can rotate relative to the fixed shaft (33). Under the action of external force, the seat back can rotate relative to the armrest (5).

2. The seat back unlocking mechanism according to claim 1, characterized in that, The unlocking component (2) includes a connecting rod (21) and a hook structure (22); The first end of the connecting rod (21) is fixedly connected to the press button assembly (1), and the second end of the connecting rod (21) is fixedly connected to the hook structure (22); The hook structure (22) is engaged and fixed with the fixed shaft (33).

3. The seat back unlocking mechanism according to claim 2, characterized in that, The hook structure (22) includes a connecting part and a hook part that are connected to each other; The connecting part is fixedly connected to the second end of the connecting rod (21), the hook part is bent toward the fixed shaft (33), and the hook part can be engaged and fixed with the fixed shaft (33).

4. The seat back unlocking mechanism according to claim 1, characterized in that, The fixing plate assembly includes a first fixing plate (31) and a second fixing plate (32) fixedly connected. The first fixing plate (31) and the second fixing plate (32) are arranged opposite to each other, with a gap between the first fixing plate (31) and the second fixing plate (32), and a receiving space is formed between the first fixing plate (31) and the second fixing plate (32).

5. The seat back unlocking mechanism according to claim 4, characterized in that, The fixing plate assembly further includes a third fixing plate, which is disposed between the first fixing plate (31) and the second fixing plate (32) and is used to fix the first fixing plate (31) and the second fixing plate (32) together.

6. The seat back unlocking mechanism according to claim 5, characterized in that, The first fixing plate (31), the second fixing plate (32) and the third fixing plate are connected to form a U-shaped structure. The first fixing plate (31), the second fixing plate (32) and the third fixing plate are integrally formed or separately formed.

7. The seat back unlocking mechanism according to claim 4, characterized in that, The fixed shaft (33) includes a first fixed end and a second fixed end that are disposed opposite to each other; The first fixed end can be fixedly connected to the handrail (5), and the second fixed end passes through the first fixed plate (31) and the second fixed plate (32) in sequence. The second fixed end is rotatably connected to the first fixed plate (31) and the second fixed plate (32) respectively.

8. The seat back unlocking mechanism according to claim 4, characterized in that, A hook structure (22) is provided below the fixed shaft (33). The hook structure (22) can extend into the receiving space and engage with the side wall of the fixed shaft (33) provided in the receiving space.

9. The seat back unlocking mechanism according to any one of claims 1-8, characterized in that, The connecting end (41) of the gas spring assembly (4) is detachably connected to the third connecting plate.

10. A type of seat, characterized in that, Includes a seat back, armrests (5), and a seat back unlocking mechanism as described in any one of claims 1-9; The seat back unlocking mechanism is located on the armrest (5), and the seat back is rotatably connected to the armrest (5) through the seat back unlocking mechanism.

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