A seat back lock structure

Abstract

This application discloses a seat backrest lock structure, including a seat base frame and a backrest frame. A locking mechanism is located on the lower side of the backrest frame, and an unlocking mechanism is located in the middle of the lower part of the backrest frame. The locking and unlocking mechanisms are connected by a detachable pull cable. The locking mechanism includes a fixed bushing, a stop pin, and an elastic element. The fixed bushing passes through the lower end of the side rod of the backrest frame. The stop pin reciprocates within the fixed bushing in cooperation with the elastic element. The base frame has a stop hole, into which the stop pin extends to secure the backrest frame. The unlocking mechanism includes an adjusting handle, a stepped screw, a pull cable fixing plate, and a reset elastic element. The stepped screw connects the adjusting handle and the pull cable fixing plate. When the adjusting handle is rotated around the stepped screw as a pivot, the stop pin can be pulled out of the stop hole to unlock the backrest lock. This application increases the structural strength of the seat frame while simplifying the backrest lock structure, simplifying the overall seat unlocking structure, resulting in high strength, low cost, and improved user experience.

Description

Technical Field

[0001] This utility model relates to the field of locking structures, and in particular to a seat back lock structure. Background Technology

[0002] Existing vehicle seat backrest angle adjustment and locking devices (fixed and flat) mostly use adjusters or core components. Firstly, both adjusters and core components employ a gear-meshing structure, requiring high-quality meshing teeth and resulting in relatively low overall strength. Secondly, both adjusters and core components need to be connected to the seat frame and backrest frame respectively, with the pivot point located on the adjuster or core component, leading to a complex connection structure. Thirdly, unlocking either the adjuster or core component requires a handle, and the handle's control of backrest position changes necessitates a transition structure, limiting the unlocking position. Furthermore, locking devices often incorporate left and right unlocking linkages and fixed cable structures, resulting in a complex overall structure, high cost, and larger space requirements, failing to adequately meet the needs of simple backrest adjustment.

[0003] Therefore, a seat back locking structure is needed to solve the above problems. Utility Model Content

[0004] To address the aforementioned technical problems, this application discloses a seat back lock structure, including a base frame and a back frame interconnected within the seat. The lower end of the back frame is provided with a locking mechanism and an unlocking mechanism. The locking mechanism is located on the side of the lower end of the back frame, and the unlocking mechanism is located in the middle of the lower end of the back frame. The locking mechanism and the unlocking mechanism are connected and cooperated by a detachable pull cable.

[0005] The locking mechanism includes a stop pin and an elastic element that are slidably connected within a fixed bushing. One end of the fixed bushing passes through the lower end of the side rod of the backrest frame, and the other end is connected to the elastic element. The stop pin can reciprocate within the fixed bushing under the cooperation of the elastic element. The base is provided with a stop hole that corresponds to the stop pin, so that the stop pin passes through the side rod and extends into the stop hole to fix the backrest frame.

[0006] The unlocking mechanism includes an adjusting handle, a step screw, a pull cable fixing plate, and a reset elastic element. One end of the step screw is connected to the adjusting handle, and the other end of the step screw is connected to the pull cable fixing plate, so that the pull cable fixing plate rotates around the step screw as a pivot when the adjusting handle is turned, thereby pulling the stop pin away from the stop hole to unlock the seat back lock.

[0007] Furthermore, the locking mechanism is provided in two sets and symmetrically on both sides of the backrest frame. The locking mechanism on both sides is symmetrically connected to the unlocking mechanism through the pull wire, so that the pull wire fixing plate rotates when the adjustment handle is turned and pulls the stop pins on both sides to disengage from the stop hole to unlock the seat back lock.

[0008] Furthermore, the pull wire fixing plate and the adjusting handle are respectively perpendicularly connected to the step screw, the two ends of the pull wire fixing plate are respectively connected to the pull wire, and the other end of the pull wire is connected to the stop pin.

[0009] Furthermore, the base is provided with a side plate, and the side plate is provided with a stop hole that corresponds to and cooperates with the stop pin;

[0010] A support plate is provided between the base frame and the backrest frame. The support plate is provided with a support part and a pin hole. The support part is used to cooperate in limiting and supporting the backrest frame. The pin hole is used for the stop pin to pass through the support plate and cooperate with the stop hole to lock. The support plate is fixed on the base frame.

[0011] Furthermore, the pull wire fixing plate includes a connecting part and a movable part, one end of the movable part is hinged to the connecting part, and the other end of the movable part is detachably connected to the pull wire.

[0012] Furthermore, the adjusting handle has an L-shaped structure, and a bent portion is provided at the connection point between the adjusting handle and the stepped screw.

[0013] Furthermore, the elastic element is a spring, which is coaxially fixed to the fixed bushing. The spring abuts against the stop pin, so that the stop pin extends into the stop hole to lock the support frame.

[0014] One end of the pull cable passes through the spring and is connected to the non-insertion end of the stop shaft, while the other end of the pull cable is connected to the unlocking mechanism.

[0015] Furthermore, the stepped screw is a stepped screw with a diameter of 14mm, and the stop pin is a pin with a diameter of 20mm.

[0016] Furthermore, the reset elastic element is sleeved on the upper end of the stepped screw to cooperate with the reset of the unlocking mechanism, and the reset elastic element is a torsion spring or a tension spring.

[0017] Furthermore, the backrest frame is connected to the seat base frame via the stepped screws.

[0018] The seat back lock structure provided in this application has at least the following beneficial effects:

[0019] 1. This application, through a simplified structural design, can increase the strength of the seat frame while simplifying the backrest lock structure, and meets the relevant regulations on fixing and strength requirements. It can effectively solve the problems of limited unlocking space and asynchronous unlocking caused by the complex structure when the seat is fixed and flat. It can simplify the overall unlocking structure of the seat, with high strength and low cost, and can better improve the user experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 : A three-dimensional schematic diagram of a seat back lock involved in an embodiment of this application;

[0022] Figure 2 : A partial schematic diagram of a seat back lock involved in an embodiment of this application;

[0023] Figure 3 Enlarged schematic diagram of the locking mechanism involved in the embodiments of this application;

[0024] Figure 4 Enlarged schematic diagram of the unlocking mechanism involved in the embodiments of this application;

[0025] In the diagram: 1-base frame; 11-side plate; 111-stop hole; 12-support plate; 121-support part; 122-pin hole;

[0026] 2-Backrest frame; 21-Locking mechanism; 211-Fixing bushing; 212-Stop pin; 213-Elastic element; 22-Unlocking mechanism; 221-Adjusting handle; 2211-Bending part; 222-Step screw; 223-Pull cable fixing plate; 2231-Connecting part; 2232-Moving part; 224-Reset elastic element; 23-Pull cable; 24-Side rod; Detailed Implementation

[0027] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] 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," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and 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. 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 indicated technical features. Thus, a feature defined with "first" and "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.

[0029] Please refer to Figure 1-3 As shown, a seat backrest locking structure includes a base frame 1 and a backrest frame 2 interconnected within the seat. The base frame 1 and backrest frame 2 can be fixed together using existing structures, which will not be elaborated further here. Specifically, the lower end of the backrest frame 2 is provided with a locking mechanism 21 and an unlocking mechanism 22. The locking mechanism 21 is located on the side of the lower end of the backrest frame 2, and the unlocking mechanism 22 is located in the middle of the lower end of the backrest frame 2. The locking mechanism 21 and the unlocking mechanism 22 are connected and cooperate via a detachable pull cable 23. The locking mechanism 21 includes a stop pin 212 and an elastic element 213 that are slidably connected within a fixed bushing 211. One end of the fixed bushing 211 passes through the lower end of the side rod 24 of the backrest frame 2, and the other end is connected to the elastic element 213. The stop pin 212 can reciprocate within the fixed bushing 211 with the cooperation of the elastic element 213. The base frame 1 is provided with a stop hole 111 that corresponds to the stop pin 212, so that the stop pin 212 passes through the side rod 24 and extends into the stop hole 111 to fix the backrest frame 2. The unlocking mechanism 22 includes an adjusting handle 221, a stepped screw 222, a pull cable fixing plate 223, and a reset elastic element 224. One end of the stepped screw 222 is connected to the adjusting handle 221, and the other end is connected to the pull cable fixing plate 223. When the adjusting handle 221 is turned, the pull cable fixing plate 223 rotates around the stepped screw 222 as a pivot, thereby pulling the stop pin 212 out of the stop hole 111 to unlock the seat back lock. This makes the back lock structure more aesthetically pleasing and simple, ensuring strength while simplifying the structure and reducing costs. It is understood that in the preferred embodiment, the stepped screw 222 can be used to connect the seat frame and the backrest frame 2, and the stepped screw 222 can also act as the pivot of the unlocking mechanism.

[0030] Based on the above technical solutions, such as Figure 1-2 The locking mechanism 21 consists of two sets and is symmetrically arranged on both sides of the backrest frame 2. The locking mechanism 21 on both sides is symmetrically connected to the unlocking mechanism 22 through the pull cable 23. When the adjustment handle 221 is turned, the pull cable fixing plate 223 rotates around the stepped screw 222 as the axis. In this way, the pull cable fixing plate 223 can pull the stop pins 212 on both sides to disengage from the stop hole 111 through the pull cable 23 to unlock the seat back lock.

[0031] Specifically, in the preferred embodiment, the cable fixing plate 223 and the adjusting handle 221 are perpendicularly connected to the stepped screw 222, and the two ends of the cable fixing plate 223 are connected to the cable 23, with the other end of the cable 23 connected to the stop pin 212. It can be understood that this allows the cable fixing plate 223, the adjusting handle 221, and the stepped screw 222 to rotate coaxially, i.e., with the stepped screw 222 as the pivot, making operation more effortless and smoother.

[0032] Specifically, the base frame 1 is provided with a side plate 11, and the side plate 11 is provided with a stop hole 111 that corresponds to and cooperates with the stop pin 212;

[0033] To ensure structural stability, a support plate 12 is provided between the base frame 1 and the backrest frame 2. The support plate 12 has a support portion 121 and a pin hole 122. The support portion 121 is used to limit and support the backrest frame 2, and the pin hole 122 is used for the locking pin 212 to pass through the support plate 12 and engage with the locking hole 111 for locking. This makes the backrest frame 2 structure more stable and ensures the limiting and fixing strength of the backrest in the locked state. Preferably, the support plate 12 is fixed to the base frame 1.

[0034] In an optional embodiment, the pull cable fixing plate 223 includes a connecting part 2231 and a movable part 2232. One end of the movable part 2232 is hinged to the connecting part 2231, and the other end of the movable part 2232 is detachably connected to the pull cable 23. In this way, when the pull cable fixing plate 223 rotates, the pull cable 23 will not wobble at a large angle, ensuring stability and making operation more labor-saving.

[0035] Alternatively, the adjusting handle 221 can be L-shaped, with a bend 2211 at the connection point between the adjusting handle 221 and the stepped screw 222. This not only makes the handle operation easier but also saves space in the overall unlocking structure.

[0036] Furthermore, the elastic element 213 is preferably a spring, which is coaxially fixed on the fixed bushing 211. The spring abuts against the stop pin 212, which allows the stop pin 212 to extend into the stop hole 111 and lock against the skeleton.

[0037] One end of the pull cable 23 passes through the spring and is connected to the non-insertion end of the stop shaft, while the other end of the pull cable 23 is connected to the unlocking mechanism 22.

[0038] In a preferred embodiment, the stepped screw 222 is a stepped screw 222 with a diameter of 14mm, and the stop pin 212 is a pin with a diameter of 20mm.

[0039] It is understood that, preferably, the reset elastic element 224 is sleeved on the upper end of the stepped screw 222 to cooperate with the reset of the unlocking mechanism 22, and the reset elastic element 224 is a torsion spring or a tension spring.

[0040] In a preferred embodiment, the backrest frame 2 is connected to the seat base frame via step screws 222.

[0041] The seat back lock structure provided in this application has at least the following beneficial effects:

[0042] 1. This application, through a simplified structural design, can increase the strength of the seat frame while simplifying the backrest lock structure, and meets the relevant regulations on fixing and strength requirements. It can effectively solve the problems of limited unlocking space and asynchronous unlocking caused by the complex structure when the seat is fixed and flat. It can simplify the overall unlocking structure of the seat, with high strength and low cost, and can better improve the user experience.

[0043] 2. The seat frame and backrest are connected by stepped screws, which is simple and sturdy. The stepped screws can also serve as the pivot of the unlocking mechanism. The pivot pins serve as the backrest stop pins and unlocking pivot pins. The unlocking function is achieved by connecting the backrest pivot pins with an unlocking handle via a pull wire. This design is not only simple and strong, but also reduces the cost of the product.

[0044] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A seat backrest locking structure, comprising a base frame and a backrest frame interconnected within the seat, characterized in that: The lower end of the backrest frame is provided with a locking mechanism and an unlocking mechanism. The locking mechanism is located on the side of the lower end of the backrest frame, and the unlocking mechanism is located in the middle of the lower end of the backrest frame. The locking mechanism and the unlocking mechanism are connected and cooperated by a detachable pull wire. The locking mechanism includes a stop pin and an elastic element that are slidably connected within a fixed bushing. One end of the fixed bushing passes through the lower end of the side rod of the backrest frame, and the other end is connected to the elastic element. The stop pin can reciprocate within the fixed bushing under the cooperation of the elastic element. The base is provided with a stop hole that corresponds to the stop pin, so that the stop pin passes through the side rod and extends into the stop hole to fix the backrest frame. The unlocking mechanism includes an adjusting handle, a step screw, a pull cable fixing plate, and a reset elastic element. One end of the step screw is connected to the adjusting handle, and the other end of the step screw is connected to the pull cable fixing plate, so that the pull cable fixing plate rotates around the step screw as a pivot when the adjusting handle is turned, thereby pulling the stop pin away from the stop hole to unlock the seat back lock.

2. The seat back lock structure according to claim 1, characterized in that, The locking mechanism consists of two sets symmetrically arranged on both sides of the backrest frame. The locking mechanisms on both sides are symmetrically connected to the unlocking mechanism via pull lines, so that the pull line fixing plate rotates when the adjustment handle is turned and pulls the stop pins on both sides to disengage from the stop holes, thereby unlocking the seat back lock.

3. The seat back lock structure according to claim 1, characterized in that, The pull wire fixing plate and the adjusting handle are respectively perpendicularly connected to the step screw. The pull wire is connected to both ends of the pull wire fixing plate, and the other end of the pull wire is connected to the stop pin.

4. The seat back lock structure according to claim 1, characterized in that, The base is provided with a side plate, and the side plate is provided with a stop hole that corresponds to and cooperates with the stop pin; A support plate is provided between the base frame and the backrest frame. The support plate is provided with a support part and a pin hole. The support part is used to cooperate in limiting and supporting the backrest frame. The pin hole is used for the stop pin to pass through the support plate and cooperate with the stop hole to lock. The support plate is fixed on the base frame.

5. A seat back lock structure according to claim 1, characterized in that, The pull wire fixing plate includes a connecting part and a movable part. One end of the movable part is hinged to the connecting part, and the other end of the movable part is detachably connected to the pull wire.

6. A seat back lock structure according to claim 1, characterized in that, The adjusting handle has an L-shaped structure, and a bent part is provided at the connection point of the adjusting handle to the stepped screw.

7. A seat back lock structure according to claim 1, characterized in that, The elastic element is a spring, which is coaxially fixed to the fixed bushing. The spring abuts against the stop pin so that the stop pin extends into the stop hole and locks against the skeleton. One end of the pull cable passes through the spring and is connected to the non-insertion end of the stop shaft, while the other end of the pull cable is connected to the unlocking mechanism.

8. A seat back lock structure according to claim 1, characterized in that, The stepped screw is a stepped screw with a diameter of 14mm, and the stop pin is a pin with a diameter of 20mm.

9. A seat back lock structure according to claim 1, characterized in that, The reset elastic element is sleeved on the upper end of the stepped screw to cooperate with the reset of the unlocking mechanism. The reset elastic element is a torsion spring or a tension spring.

10. A seat back lock structure according to any one of claims 1-9, characterized in that, The backrest frame is connected to the seat base frame via the stepped screws.

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