Backrest lock

Abstract

This utility model discloses a backrest lock, including a base plate. A locking hook and a locking plate are movably disposed on the base plate. The end of the locking plate has a pull head for connecting and cooperating with an external car pull rod, so that when the pull rod is pulled, the locking plate swings to release the restriction on the swing of the locking hook. The inner wall of the locking hook has a positioning strip for synchronously moving along the swing trajectory of the locking hook when it swings. The inner wall of the base plate has a positioning structure that works in conjunction with the positioning strip to guide the swing trajectory of the locking hook and limit the direction of the hook's swing, and an auxiliary structure that works in conjunction with the positioning structure to limit the wobbling or loosening of the locking hook when it is subjected to vibration and to improve the smoothness of the hook's swing. This utility model solves the problems of unstable hook swing trajectory and insufficient positioning accuracy in traditional backrest locks, easy loosening or wobbling of the locking hook under vibration, and insufficient smoothness of the hook's swing leading to operational jamming.

Description

Technical Field

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

[0002] In car seat design, the backrest lock is a key component, its performance directly affecting passenger safety and comfort. Most seats are equipped with backrest locks to unlock or unlock the seat. When the backrest lock is unlocked, the seat can be folded down or flipped over to expand storage space when needed. There are many types of backrest locks available, among which the most commonly used typically consists of a housing, a locking plate, a rivet, and a hook rotatably mounted on the rivet. The operator uses an external lever to swing the locking plate, releasing the hook's restriction. The hook then swings, opening and closing the lock groove in the housing. When the groove is open, the car lock pin disengages, unlocking the seat.

[0003] Traditional backrest locks lack effective guiding and positioning structures when their hooks engage with the car's locking pin. This results in unstable swing trajectories during the hook's movement, making it prone to deviation or wobbling. In actual use, these issues prevent the hook from accurately engaging with the locking pin, reducing the reliability of the lock. Furthermore, when the car vibrates during driving, the lack of corresponding restraint structures can cause the hook to wobble or loosen, leading to abnormal noises and affecting the riding experience. Frequent vibrations during driving can cause gaps between the hook and the locking pin, resulting in loosening, abnormal noises, or even accidental unlocking. Additionally, traditional backrest locks may lack auxiliary guiding or drag-reducing measures in their structural design, leading to high friction and poor smoothness when the hook swings, impacting the user's operating experience. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a backrest lock that solves the problems of unstable hook swing trajectory and insufficient positioning accuracy in traditional backrest locks, easy loosening or shaking of the hook under vibration, and insufficient smoothness of hook swing leading to operational jamming.

[0005] To achieve the above objectives, this utility model provides a backrest lock, including a base plate for installation on an external vehicle engine. The base plate is movably provided with a hook for engaging with an external vehicle locking pin and a locking plate for engaging with the hook to limit its swing. The locking plate has a pull head at its end for engaging with an external vehicle pull rod, causing the locking plate to swing and release the restriction on the hook's swing when the pull rod is pulled. The inner wall of the hook has a positioning strip for synchronously moving along the hook's swing trajectory when it swings. The inner wall of the base plate has a positioning structure for engaging with the positioning strip to guide the hook's swing trajectory and limit its swing direction, and an auxiliary structure for engaging with the positioning structure to limit the hook's wobbling or loosening when subjected to vibration and to improve the smoothness of the hook's swing.

[0006] The advantages of adopting the above technical solution are as follows: By setting a positioning strip on the inner wall of the lock hook and setting a positioning structure that works in conjunction with it on the inner wall of the base plate, the swing trajectory of the lock hook can be accurately guided while limiting its swing direction. This ensures that the lock hook can accurately reach the predetermined position when engaging with the external car lock pin, avoiding locking failure caused by swing trajectory deviation, greatly improving the reliability of locking, and ensuring the stability of the car seat back during normal use. Simultaneously, an auxiliary structure is set on the inner wall of the base plate, which works in conjunction with the positioning structure. When the car vibrates during driving, [the auxiliary structure is activated]. The auxiliary structure effectively limits the swaying or loosening of the locking hook, reducing the gap between the locking hook and other components caused by vibration, preventing abnormal noise, and avoiding accidental unlocking due to vibration, thus providing passengers with a safer and more comfortable riding environment. In addition to its vibration-resistant properties, the auxiliary structure also improves the smoothness of the locking hook's swing. By optimizing the linkage with the positioning structure, it reduces friction during the hook's swing, making the hook swing more smoothly. Users can experience a more relaxed and smoother feel when operating the backrest lock, enhancing the user experience.

[0007] The present invention further comprises: the positioning structure including a positioning block, the positioning block having a positioning groove along its length for the positioning strip to be inserted and slid in, the positioning strip being slidably disposed in the positioning groove and the two side walls of the positioning strip being fitted with the inner peripheral wall of the positioning groove with a clearance fit.

[0008] The advantages of adopting the above technical solution are as follows: The positioning structure in the above technology adopts the design of positioning block and positioning groove. The positioning strip can be inserted into the positioning groove and slide along the positioning groove. This structure provides precise guidance for the swing of the locking hook, so that the locking hook can move strictly according to the trajectory defined by the positioning groove during the swing. In the actual application of the backrest lock, the locking hook needs to be accurately hooked and cooperated with the external car lock pillar. The guiding effect of the positioning groove on the positioning strip ensures that the locking hook can accurately reach the target position, which greatly improves the accuracy and reliability of locking. For example, during the process of frequently adjusting the backrest angle of the car seat, the locking hook can always swing according to the preset trajectory, ensuring stable connection with the lock pillar and avoiding the locking failure problem caused by the deviation of the locking hook swing trajectory.

[0009] The present invention further comprises: the radial cross-section of the positioning strip is arc-shaped and the arc direction of the positioning strip is consistent with the swing direction of the locking hook; the radial cross-section of the positioning groove is arc-shaped and the arc direction of the positioning groove is consistent with the arc direction of the positioning strip.

[0010] The advantages of adopting the above technical solution are as follows: the radial cross-sections of the positioning strip and positioning groove are both arc-shaped, and the direction of the arc is consistent with the swing direction of the hook. The hook follows a certain arc trajectory during its swing. This arc design can be highly adapted to the movement trajectory of the hook. When the hook swings, the positioning strip can smoothly slide along the arc trajectory in the positioning groove, providing more precise guidance for the hook. This ensures that the hook can accurately reach the predetermined position when it is engaged with the external car lock, avoiding locking failure due to trajectory deviation. This greatly improves the accuracy and reliability of the backrest lock. At the same time, the arc-shaped positioning strip and positioning groove design helps to optimize the force distribution. During the swing of the hook, the force it bears can be evenly distributed to various parts of the positioning strip and positioning groove through the arc structure, avoiding stress concentration. This allows the hook to maintain a more stable state when subjected to external forces (such as vibration and impact during car driving), reducing the possibility of shaking and loosening. This effectively enhances the overall structural stability of the backrest lock and improves its reliability and safety in complex usage environments.

[0011] The present invention further comprises: a plurality of positioning holes are evenly distributed on the inner peripheral wall of the positioning groove along the length of the positioning groove, and a ball is rolled in each positioning hole. The plurality of positioning holes are arranged in pairs and are located on both sides of the positioning strip. The diameter of the opening of the positioning hole is smaller than the diameter of the ball. The ball partially protrudes from the opening of the positioning hole and partially contacts the positioning strip. The plurality of balls are auxiliary structures.

[0012] The advantages of adopting the above technical solution are: The use of rolling balls as an auxiliary structure on the inner circumferential wall of the positioning groove significantly reduces the frictional resistance between the positioning bar and the positioning groove. When the locking hook swings, causing the positioning bar to slide within the positioning groove, the balls roll between the positioning bar and the groove, transforming the original sliding friction into rolling friction. The coefficient of rolling friction is much smaller than the coefficient of sliding friction, making the sliding of the positioning bar smoother. This significantly improves the smoothness of the locking hook's swing. When operating the backrest lock to unlock or lock, the user will experience a noticeably easier and smoother feel, greatly enhancing the user's experience. This technology enhances the user experience. In this technology, several positioning holes are arranged in pairs on both sides of the positioning strip, and the ball bearings partially protrude from the openings of the positioning holes and partially contact the positioning strip. The symmetrically distributed ball bearing structure can provide stable support and constraint to the positioning strip from both sides. When the locking hook is subjected to vibration force, the ball bearings can effectively disperse and buffer the external force, reducing the shaking and loosening of the locking hook. The ball bearings on both sides work together to keep the locking hook in a stable posture during the swinging process, ensuring that the locking hook always swings according to the predetermined trajectory and direction, thus improving the reliability and safety of the backrest lock in complex usage environments.

[0013] The present invention further includes: rubber pads are laid on both sides of the positioning strip along the length of the positioning strip, and a buffer pad is attached to the bottom wall of the positioning groove, the buffer pad being made of elastic material.

[0014] The advantages of adopting the above technical solution are: the use of buffer pads and rubber pads reduces noise and noise, while also providing a buffering effect, reducing direct collision and friction between the positioning strip and the positioning groove, improving the smoothness of the lock hook swing, and enhancing the stability of the lock hook.

[0015] The present invention further comprises: hollow spindles passing through the base plate at the positions corresponding to the locking plate and the locking hook; the locking plate and the locking hook are rotatably mounted on their respective hollow spindles along the axial direction of their respective hollow spindles; and a return torsion spring is connected between the locking plate and the locking hook and their respective hollow spindles.

[0016] The advantages of adopting the above technical solution are as follows: the hollow main shaft provides a stable rotational support structure for the locking plate and the locking hook. The hollow main shaft ensures that the locking plate and the locking hook rotate accurately and smoothly along their respective axes, avoiding instability such as wobbling or offset, thereby improving the accuracy and reliability of the backrest lock operation. The return torsion spring connects the locking plate, the locking hook, and their respective hollow main shafts, giving the backrest lock the ability to automatically reset. When the user operates an external car lever to swing the locking plate to release the locking hook, or when the locking hook completes its engagement or disengagement with the locking pin, the locking plate and the locking hook automatically return to their initial position under the elastic restoring force of the return torsion spring. This automatic reset function not only simplifies the backrest lock operation process and improves ease of use, but also ensures that the backrest lock is in a stable and reusable state after each operation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the present invention;

[0018] Figure 2 This is a three-dimensional view of the present invention after the substrate has been removed;

[0019] Figure 3 This is a simplified three-dimensional view of the positioning block and positioning strip in the engagement state of this utility model;

[0020] Figure 4 for Figure 3 A simplified sectional view of the axial section;

[0021] Figure 5 for Figure 3 A simplified cross-sectional view of the radial section. Detailed Implementation

[0022] This utility model provides a backrest lock, including a base plate 1 for installation on an external vehicle infotainment system. The base plate 1 has a movably disposed hook 11 for engaging with an external vehicle locking cylinder and a locking plate 12 for engaging with the hook 11 to restrict its swing. The locking plate 12 has a pull head 111 at its end for engaging with an external vehicle pull rod, causing the locking plate 12 to swing and release the restriction on the hook 11's swing when the pull rod is pulled. The inner wall of the hook 11 has a positioning strip 2 for synchronously moving along the hook 11's swing trajectory when the hook 11 swings. The inner wall of the base plate 1 is provided with... The system includes a positioning structure that works in conjunction with the positioning strip 2 to guide the swing trajectory of the locking hook 11 and limit its swing direction, and an auxiliary structure that works in conjunction with the positioning structure to limit the wobbling or loosening of the locking hook 11 when it is subjected to vibrational force and to improve the smoothness of its swing. The positioning structure includes a positioning block 3, which has a positioning groove 31 along its length for the positioning strip 2 to be inserted and slid in. The positioning strip 2 is slidably disposed in the positioning groove 31, and its two side walls are clearance-fitted with the inner peripheral wall of the positioning groove 31. The radial cross-section of the positioning strip 2... The positioning groove 31 is arc-shaped, with its arc direction aligned with the swing direction of the locking hook 11. The radial cross-section of the positioning groove 31 is also arc-shaped, with its arc direction aligned with the arc direction of the positioning strip 2. Several positioning holes 311 are evenly distributed along the length of the positioning groove 31 on its inner peripheral wall. Each positioning hole 311 contains a rolling ball 32. The positioning holes 311 are arranged in pairs on both sides of the positioning strip 2. The diameter of the opening of each positioning hole 311 is smaller than the diameter of the rolling ball 32. Partially, the rolling ball 32 protrudes from the opening of the positioning hole 311 and interacts with the positioning strip 2. The part is in contact with the ball bearing 32, which is an auxiliary structure. Rubber pads 21 are laid on both sides of the positioning strip 2 along the length of the positioning strip 2. A buffer pad 33 is attached to the bottom wall of the positioning groove 31. The buffer pad 33 is made of elastic material. Hollow spindles 13 are inserted through the base plate 1 at the positions corresponding to the locking piece 12 and the locking hook 11. The locking piece 12 and the locking hook 11 are rotatably mounted on their respective hollow spindles 13 along the axial direction of their respective hollow spindles 13. A return torsion spring 14 is connected between the locking piece 12 and the locking hook 11 and their respective hollow spindles 13.

[0023] In this invention, the locking mechanism between the hook and the locking plate adopts an existing mature technical solution: the locking plate is provided with a protrusion for limiting the swing of the hook. The protrusion and the limiting groove or limiting surface of the outer wall of the hook are engaged. In the locked state, the protrusion and the hook abut against each other, thereby limiting the swing trajectory of the hook and ensuring its stable connection with the external locking pin. When unlocking is required, the locking plate is pulled around the hollow main shaft by an external pull rod, so that the protrusion and the limiting structure of the hook are separated, releasing the restriction on the swing of the hook. At this time, the hook can swing freely to achieve the unlocking action.

[0024] Since the above-mentioned locking structure (including the specific cooperation form between the protrusion and the locking hook limiting structure) is a conventional technical means in this field, its specific structure and operating principle have been covered by the prior art, and are not the innovative improvement point of this utility model, its structural details and functional principles will not be further described.

[0025] The shapes and sizes of the positioning blocks, positioning strips, and balls in the accompanying drawings of the above instruction manual are for illustrative purposes only and can be adjusted according to actual production needs, assembly needs, application needs, and limit requirements.

[0026] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A backrest lock, comprising a base plate for mounting on an external vehicle infotainment system, wherein the base plate is movably disposed with a locking hook for engaging with an external vehicle locking cylinder and a locking plate for engaging with the locking hook to limit the swing of the locking hook, and the end of the locking plate is provided with a pull head for engaging with an external vehicle pull rod so that when the pull rod is pulled, the locking plate swings to release the restriction on the swing of the locking hook, characterized in that: The inner wall of the lock hook is provided with a positioning strip for synchronous movement along the swing trajectory of the lock hook when it swings. The inner wall of the base plate is provided with a positioning structure for linkage with the positioning strip to guide the swing trajectory of the lock hook and limit the swing direction of the lock hook, and an auxiliary structure for linkage with the positioning structure to limit the swaying or loosening of the lock hook when it is subjected to vibration force and to improve the smoothness of the lock hook swing when it swings.

2. A backrest lock according to claim 1, characterized in that: The positioning structure includes a positioning block, which has a positioning groove along its length for the positioning strip to be inserted and slid. The positioning strip is slidably disposed in the positioning groove, and the two side walls of the positioning strip are fitted with the inner peripheral wall of the positioning groove with a clearance fit.

3. A backrest lock according to claim 2, characterized in that: The radial cross-section of the positioning strip is arc-shaped and the arc direction of the positioning strip is consistent with the swing direction of the locking hook. The radial cross-section of the positioning groove is arc-shaped and the arc direction of the positioning groove is consistent with the arc direction of the positioning strip.

4. A backrest lock according to claim 2, characterized in that: The positioning groove has several positioning holes evenly distributed along its length on the inner circumferential wall. Each positioning hole contains a rolling ball. The positioning holes are arranged in pairs on both sides of the positioning strip. The diameter of the opening of the positioning hole is smaller than the diameter of the rolling ball. The rolling ball partially protrudes from the opening of the positioning hole and partially contacts the positioning strip. The rolling ball is an auxiliary structure.

5. A backrest lock according to claim 1, characterized in that: Rubber pads are laid on both sides of the positioning strip along the length of the positioning strip, and a buffer pad is attached to the bottom wall of the positioning groove. The buffer pad is made of elastic material.

6. A backrest lock according to claim 1, characterized in that: Hollow spindles are provided at the corresponding locking plates and locking hooks on the base plate. The locking plates and locking hooks are rotatably mounted on their respective hollow spindles along the axial direction of their respective hollow spindles. A return torsion spring is connected between the locking plates and locking hooks and their respective hollow spindles.

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