Seat backrest lock
By incorporating a locking plate and a locking plate torsion spring into the seat back lock, the problem of noise and shaking caused by impact in the seat back lock is solved, achieving a reliable locking effect and improving user comfort.
Patent Information
- Application Number
- CN202520254807.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-18
AI Technical Summary
Existing seat back locks are prone to noise and shaking due to impacts during use, affecting the driving and riding experience.
Based on the existing ratchet and pawl structure, a locking plate and a locking plate torsion spring are added. The locking plate presses against the locking mating surface of the ratchet under the action of the torsion spring, avoiding collision between the ratchet and pawl and achieving reliable locking.
It effectively avoids noise from the seat back during impacts, ensures the seat is locked and does not wobble, and improves driving and riding comfort.
Smart Images
Figure CN223919159U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lock technology, specifically a seat back lock. Background Technology
[0002] Seat back locks are an important component of car seats. When adjusting the seat, the lock is first opened, and then the seat back is rotated to a certain angle before locking. Existing seat back locks use a single ratchet and a single pawl to lock the seat. However, when the driver is driving or the passenger is riding, the backrest will inevitably be subjected to pressure and impact. When the seat back lock is under force, it will press the ratchet to rotate, and when the force is released, it will return to its original position. This will cause the ratchet and pawl to collide, making a sound, and the seat will also shake to some extent, affecting the driving and riding experience. Summary of the Invention
[0003] To solve the above-mentioned technical problems, this utility model provides a seat back lock that can avoid noise caused by impact to the seat and ensure that the seat lock can be reliably locked.
[0004] The technical solution is as follows: A seat back lock includes a housing, within which a ratchet mounting shaft and a pawl mounting shaft are disposed. A ratchet is rotatably mounted on the ratchet mounting shaft and a ratchet torsion spring is disposed thereon. A pawl is rotatably mounted on the pawl mounting shaft and a pawl torsion spring is disposed thereon. The ratchet has a pressure groove. The lock plate is rotatably mounted on the pawl mounting shaft and a locking plate torsion spring is disposed thereon. The locking plate and the pawl are axially offset. The ratchet has a locking mating surface that engages with the pawl and a locking mating surface that engages with one side of the locking plate on the side facing the pawl. The locking plate also has a transmission component that engages with the pawl. When the pawl is unlocked and rotated, it pushes the transmission component to rotate the locking plate.
[0005] A further feature is that a locking groove is provided on the housing, and a nylon support is provided at the bottom of the locking groove;
[0006] The transmission component is a bent piece disposed on the other side of the locking piece and facing the pawl;
[0007] The ratchet is formed by splicing a ratchet housing and a ratchet component. The locking mating surface is formed on the ratchet housing. A through hole is provided on the ratchet housing. The locking mating surface is formed on the ratchet component and is located at the through hole.
[0008] By adopting this utility model, a locking plate is added to the original ratchet and pawl. When locked, the locking plate can press against the locking mating surface on the ratchet. When the seat is impacted, the ratchet will rotate slightly in the locking direction under the pressure of the lock core. The locking plate will also rotate slightly under the action of the torsion spring. The locking plate always presses against the locking mating surface on the ratchet, so that there will be no loosening, achieving reliable locking and avoiding noise generation. Attached Figure Description
[0009] Figure 1 This is a front view of the structure of this utility model;
[0010] Figure 2 This is a schematic diagram of the back of the structure of this utility model;
[0011] Figure 3 This is a front view of the present invention with the casing removed;
[0012] Figure 4 This is a schematic diagram of the back of the casing removed from this utility model;
[0013] Figure 5 This is a schematic diagram of a ratchet structure;
[0014] Figure 6 This is a schematic diagram of the ratchet housing structure;
[0015] Figure 7 This is a schematic diagram of the pawl structure;
[0016] Figure 8 This is a schematic diagram of the gripper and locking plate structure. Detailed Implementation
[0017] See Figures 1 to 8 As shown, a seat back lock includes a housing 1. A ratchet mounting shaft 2 and a pawl mounting shaft 3 are disposed within the housing 1. A ratchet 4 is rotatably mounted on the ratchet mounting shaft 2 and a ratchet torsion spring 5 is provided. A pawl 6 is rotatably mounted on the pawl mounting shaft 3 and a pawl torsion spring 7 is provided. A pressure groove 8 is formed on the ratchet 4. A locking plate 9 is also rotatably mounted on the pawl mounting shaft 3 and a locking plate torsion spring 10 is provided. The locking plate 9 and the pawl 6 are axially offset. The ratchet 4 has a locking mating surface 4-1 that mates with the pawl 6 and a locking mating surface 4-2 that mates with one side of the locking plate 9 on the side facing the pawl 6. The locking plate 9 also has a transmission component that mates with the pawl 6. The transmission component is a bent piece 10 facing the pawl 6. When the pawl 6 is unlocked and rotated, it pushes the bent piece 10 to rotate the locking plate 9.
[0018] The housing 1 has a locking groove 11, and a nylon support 12 is provided at the bottom of the locking groove 11. The support has a certain elasticity, and the buckle 13 can undergo a certain deformation when pressed on the nylon support 12.
[0019] The ratchet 4 is assembled from a ratchet housing 4-3 and a ratchet component 4-4. The locking mating surface 4-1 is formed on the ratchet housing 4-3. A through hole 4-5 is provided on the ratchet housing 4-3. The locking mating surface 4-2 is formed on the ratchet component 4-4 and is located at the through hole 4-5.
[0020] Before locking, both ratchet 4 and pawl 6 are in the upward-open state, and the opening of the pressing groove 8 is facing upward. When locking, the locking buckle 13 is pressed into the pressing groove 8, and as the locking buckle 13 moves downward, it drives the ratchet 4 to rotate. The ratchet 4 pushes the pawl 6 to rotate. When the pawl 6 rotates, the locking plate 9 also rotates under the action of the bending piece 10, making way for the ratchet 4. After the locking buckle 13 is pressed into place, the ratchet 4 rotates in the opposite direction to reset under the action of the ratchet torsion spring 5, and abuts against the locking mating surface 4-1 of the ratchet 4. At the same time, the locking plate 9 is no longer affected by the pawl 6, and rotates in the opposite direction to reset under the action of the locking plate torsion spring 10. It presses against the locking mating surface 4-2. Since the function of the pawl 6 is to press down on the ratchet 4 and prevent it from rotating upward, when it is impacted, the latch 13 will continue to move downward and press down on the nylon support 12. When it is no longer under force, it will reset under the action of the ratchet torsion spring 5. Therefore, the ratchet 4 and the pawl 6 will collide and make a sound. However, due to the presence of the locking plate 9, even if the ratchet 4 continues to rotate downward under force after being locked, the locking plate 5 will also rotate under the action of the locking plate torsion spring 10, always pressing down on the ratchet 4 and preventing it from resetting, thus avoiding collision with the pawl 6 and making no sound. The latch will become tighter and tighter.
[0021] When unlocking, pull the pawl 6 to make it rotate, which will drive the locking plate 9 to rotate, so that it no longer blocks the ratchet 4. The ratchet 4 rotates under the action of the ratchet torsion spring 5 and enters the unlocking state.
Claims
1. A seat backrest lock comprising a housing, a ratchet wheel mounting shaft and a pawl mounting shaft are arranged in the housing, a ratchet wheel is rotatably mounted on the ratchet wheel mounting shaft and a ratchet wheel torsion spring is arranged on the ratchet wheel mounting shaft, a pawl is rotatably mounted on the pawl mounting shaft and a pawl torsion spring is arranged on the pawl mounting shaft, a press-turning groove is formed on the ratchet wheel, characterized in that, The pawl mounting shaft is also rotationally mounted with a locking piece and provided with a locking piece torsion spring, the locking piece is arranged axially offset from the pawl, the side of the ratchet wheel facing the pawl is respectively provided with an upper locking cooperation surface matched with the pawl and a locking cooperation surface matched with one side of the locking piece, the locking piece is also provided with a transmission member matched with the pawl, and the pawl is unlocked to rotate to push the transmission member to rotate the locking piece.
2. A seat backrest lock according to claim 1, characterized in that A nylon support member is arranged at the bottom of the lock slot.
3. A seat backrest lock according to claim 1, characterized in that The transmission member is a bent piece arranged on the other side of the locking piece and facing the pawl.
4. A seat backrest lock according to claim 1, characterized in that The ratchet wheel is spliced by a ratchet wheel shell and a ratchet wheel member, the upper locking cooperation surface is formed on the ratchet wheel shell, a through hole is arranged on the ratchet wheel shell, and the locking cooperation surface is formed on the ratchet wheel member and located at the position of the through hole.