Automobile second-gear seat backrest lock with buffering cushion
By setting a buffer pad in the casing notch of the second-speed seat back lock of the car, the abnormal noise caused by friction between the lock bolt and the slot is solved, and a more silent seat usage experience is achieved.
Patent Information
- Application Number
- CN202422951881.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-12-02
AI Technical Summary
When locking, the locking bolts and slots are caused by abnormal noise when locking, due to manufacturing tolerances and vehicle vibration.
A buffer pad is provided in the housing notch of the backrest lock, and the buffer pads play a role in buffering and clamping the locking bolt to reduce the direct friction between the locking bolt and the slot.
It effectively reduces abnormal noise during locking and improves the silent effect of seat use.
Smart Images
Figure CN223302577U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of automobile accessories, in particular to an automobile seat, in particular to a second-gear automobile seat back lock with a buffer pad. Background Art
[0002] In existing second-stage seatback locks, a lock body and a lock bolt are installed in the seat and backrest of the vehicle, respectively. The lock bolt moves within a notch in the lock body to lock and unlock using a handle. Due to manufacturing tolerances between the components of the seat and the lock body, as well as vibrations during vehicle operation, friction may occur between the lock bolt and the bottom of the notch when the seatback lock is locked, potentially causing unusual noises during vehicle operation. Summary of the Invention
[0003] The purpose of the utility model is to provide a second-speed car seat back lock with a cushion, which solves the technical problem in the prior art that abnormal noise may be generated when the back lock is locked.
[0004] The second-stage car seat adjustment lock with a cushion of the utility model comprises:
[0005] A housing, wherein the housing is provided with a rightward notch, a first bearing pin is provided on the right side above the notch, a second bearing pin is provided on the left side above the notch, a third bearing pin is provided below the notch, and a buffer pad is provided at the left end of the notch;
[0006] A handle, wherein the middle of the handle is pivotally connected to the housing, and the lower end of the handle is provided with a first downward groove;
[0007] a stop hook rotatably sleeved on the first bearing pin, a transverse pin fixedly provided at the upper end of the stop hook, the pin extending into the first groove, a support arm provided on the left side of the stop hook, and a first stop groove provided on the lower left side of the stop hook;
[0008] A self-locking plate is rotatably sleeved on the first bearing pin, the self-locking plate is arranged on one side of the stop hook, the upper end of the self-locking plate is provided with a first protrusion, the first protrusion and the stop hook are in the same plane and are located above and to the right of the stop hook, and a limiting protrusion is provided on the lower left side of the self-locking plate;
[0009] A limiting plate is rotatably disposed on the second bearing pin, a second protrusion is disposed on the upper right side of the limiting plate, the second protrusion and the stop hook are in the same plane, and a second stop groove is disposed on the lower right side of the limiting plate;
[0010] a lock tongue block, wherein the lock tongue block is rotatably sleeved on the third bearing pin, the lock tongue block is located in the plane where the stop hook and the self-locking plate are located, the lock tongue block is provided with a front lock claw and a rear lock claw, the front lock claw and the rear lock claw pass upward through the notch, a second groove is provided between the front lock claw and the rear lock claw, the upper right ends of the front lock claw and the rear lock claw cooperate with the first stop groove, and the right ends of the front lock claw and the rear lock claw cooperate with the limiting protrusion;
[0011] The stop block is rotatably mounted on the third bearing pin. The stop block and the limit plate are in the same plane. A blocking portion is provided on the upper side of the stop block. The blocking portion passes upward through the slot, and the upper left end of the blocking portion cooperates with the second stop groove.
[0012] Furthermore, pins are provided on both sides of the middle of the handle, and the handle is pivotally connected to the shell through the pins. A handle torsion spring is sleeved on the pin on one side, one end of the handle torsion spring is connected to the handle, and the other end is connected to the shell. The handle torsion spring biases the handle in a clockwise direction.
[0013] Furthermore, the first bearing pin outer sleeve is provided with a stop hook torsion spring and a self-locking plate torsion spring, one end of the stop hook torsion spring is connected to the stop hook, and the other end is connected to the shell, one end of the self-locking plate torsion spring is connected to the self-locking plate, and the other end is connected to the shell, the stop hook torsion spring biases the stop hook in the counterclockwise direction, and the self-locking plate torsion spring biases the self-locking plate in the counterclockwise direction.
[0014] Furthermore, a limit plate torsion spring is provided on the outer sleeve of the second bearing pin, one end of the limit plate torsion spring is connected to the limit plate, and the other end of the limit plate torsion spring is connected to the housing, and the limit plate torsion spring biases the limit plate in a clockwise direction.
[0015] Furthermore, the third bearing pin outer sleeve is provided with a lock tongue block torsion spring and a stop point block torsion spring, one end of the lock tongue block torsion spring is connected to the lock tongue block, and the other end is connected to the shell, one end of the stop point block torsion spring is connected to the stop point block, and the other end is connected to the shell, the lock tongue block torsion spring biases the lock tongue block in a clockwise direction, and the stop point block torsion spring biases the stop point block in a clockwise direction.
[0016] Furthermore, a slot is provided on one side of the shell, and one end of the first protrusion extends out of the slot.
[0017] Furthermore, the housing is provided with a bracket on the front side of the slot, and a gap is provided between the bracket and the slot.
[0018] Furthermore, the shell includes a bottom shell and a cover plate, the cover plate is arranged on the front side of the bottom shell, and the buffer pad is wrapped on the bottom shell and / or the cover plate.
[0019] Furthermore, the locking tongue block is provided with a through hole, which is sleeved on the outside of the third bearing pin, and an axial oil groove is provided in the through hole.
[0020] Furthermore, both sides of the second groove of the locking tongue block are wrapped with a first protective cover, and the blocking portion of the blocking point block is wrapped with a second protective cover.
[0021] Compared with the prior art, the present invention has a positive and obvious effect. The present invention provides a buffer pad in the notch of the backrest lock housing to buffer and clamp the lock bolt, thereby reducing abnormal noise generated when the backrest lock is locked during vehicle operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the present utility model.
[0023] Figure 2 It is a schematic diagram of the cover plate of the present invention.
[0024] Figure 3 It is a schematic diagram of the handle of the present utility model.
[0025] Figure 4 It is a schematic diagram of the stop hook of the utility model.
[0026] Figure 5 It is a schematic diagram of the self-locking piece of the present utility model.
[0027] Figure 6 It is a schematic diagram of the limiting plate of the present utility model.
[0028] Figure 7 It is a schematic diagram of the lock tongue block of the present utility model.
[0029] Figure 8 It is a schematic diagram of the stop block of the utility model.
[0030] Figure 9 It is a front view of the interior of the utility model at the first gear locking position.
[0031] Figure 10 It is a schematic diagram of the interior reverse side of the first gear locking position of the utility model.
[0032] Figure 11 It is a front view of the interior of the second gear locked position of the utility model.
[0033] Figure 12 It is a front view of the interior of the utility model at the unlocking position.
[0034] Among them, 10 is the housing, 11 is the notch, 12 is the first bearing pin, 13 is the second bearing pin, 14 is the third bearing pin, 15 is the buffer pad, 16 is the slot, 17 is the bracket, 18 is the bottom shell, 19 is the cover, 20 is the handle, 21 is the pin shaft, 22 is the first groove, 23 is the handle torsion spring, 30 is the stop hook, 31 is the pin, 32 is the support arm, 33 is the first stop groove, 34 is the stop hook torsion spring, 40 is the self-locking plate, 41 4 is the first protrusion, 42 is the limiting protrusion, 43 is the self-locking plate torsion spring, 50 is the limiting plate, 51 is the second protrusion, 52 is the second stop groove, 53 is the limiting plate torsion spring, 60 is the lock tongue block, 61 is the front lock claw, 62 is the rear lock claw, 63 is the second groove, 64 is the lock tongue block torsion spring, 65 is the oil groove, 66 is the first protective cover, 70 is the stop point block, 71 is the blocking part, 72 is the stop point block torsion spring, 73 is the second protective cover, and 80 is the lock bolt. DETAILED DESCRIPTION
[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited thereto.
[0036] like Figures 1-6 As shown, the utility model is a second-stage car seat back lock with a cushion, comprising:
[0037] The housing 10 is provided with a rightward notch 11, a first bearing pin 12 is provided on the right side above the notch 11, a second bearing pin 13 is provided on the left side above the notch 11, a third bearing pin 14 is provided below the notch 11, and a buffer pad 15 is provided at the left end of the notch 11;
[0038] A handle 20, wherein the middle of the handle 20 is pivotally connected to the housing 10, and a first downward groove 22 is provided at the lower end of the handle 20;
[0039] A stop hook 30 is rotatably mounted on the first bearing pin 12. A transverse pin 31 is fixedly mounted on the upper end of the stop hook 30. The pin 31 extends into the first groove 22. A support arm 32 is disposed on the left side of the stop hook 30. A first stop groove 33 is disposed on the lower left side of the stop hook 30.
[0040] A self-locking plate 40 is rotatably mounted on the first bearing pin 12 and is disposed on one side of the stop hook 30. A first protrusion 41 is disposed on the upper end of the self-locking plate 40. The first protrusion 41 is coplanar with the stop hook 30 and is located above and to the right of the stop hook 30. A limiting protrusion 42 is disposed on the lower left side of the self-locking plate 40.
[0041] A limiting plate 50 is rotatably disposed on the second bearing pin 13. A second protrusion 51 is disposed on the upper right side of the limiting plate 50. The second protrusion 51 and the stop hook 30 are coplanar. A second stop groove 52 is disposed on the lower right side of the limiting plate 50.
[0042] The lock tongue block 60 is rotatably sleeved on the third bearing pin 14. The lock tongue block 60 is located in the plane where the stop hook 30 and the self-locking plate 40 are located. The lock tongue block 60 is provided with a front lock claw 61 and a rear lock claw 62. The front lock claw 61 and the rear lock claw 62 pass upward through the notch 11. A second groove 63 is provided between the front lock claw 61 and the rear lock claw 62. The upper right ends of the front lock claw 61 and the rear lock claw 62 cooperate with the first stop groove 33, and the right ends of the front lock claw 61 and the rear lock claw 62 cooperate with the limiting protrusion 42.
[0043] The stop block 70 is rotatably mounted on the third bearing pin 14 . The stop block 70 and the limit plate 50 are in the same plane. A blocking portion 71 is provided on the upper side of the stop block 70 . The blocking portion 71 passes upward through the slot 11 . The upper left end of the blocking portion 71 cooperates with the second stop groove 52 .
[0044] Furthermore, pins 21 are provided on both sides of the middle of the handle 20, and the handle 20 is pivotally connected to the shell 10 through the pins 21. A handle torsion spring 23 is sleeved on the pin 21 on one side, and one end of the handle torsion spring 23 is connected to the handle 20, and the other end is connected to the shell 10. The handle torsion spring 23 biases the handle 20 in a clockwise direction.
[0045] Furthermore, the outer sleeve of the first bearing pin 12 is provided with a stop hook torsion spring 34 and a self-locking plate torsion spring 43, one end of the stop hook torsion spring 34 is connected to the stop hook 30, and the other end is connected to the housing 10, one end of the self-locking plate torsion spring 43 is connected to the self-locking plate 40, and the other end is connected to the housing 10, the stop hook torsion spring 34 biases the stop hook 30 in the counterclockwise direction, and the self-locking plate torsion spring 43 biases the self-locking plate 40 in the counterclockwise direction.
[0046] Furthermore, a limit plate torsion spring 53 is provided on the outer sleeve of the second bearing pin 13, one end of the limit plate torsion spring 53 is connected to the limit plate 50, and the other end of the limit plate torsion spring 53 is connected to the housing 10, and the limit plate torsion spring 53 biases the limit plate 50 in the clockwise direction.
[0047] Furthermore, the outer sleeve of the third bearing pin 14 is provided with a lock tongue block torsion spring 64 and a stop point block torsion spring 72, one end of the lock tongue block torsion spring 64 is connected to the lock tongue block 60, and the other end is connected to the shell 10, one end of the stop point block torsion spring 72 is connected to the stop point block 70, and the other end is connected to the shell 10, the lock tongue block torsion spring 64 biases the lock tongue block 60 in the clockwise direction, and the stop point block torsion spring 72 biases the stop point block 70 in the clockwise direction.
[0048] Furthermore, a slot 16 is provided on one side of the housing 10 , and one end of the first protrusion 41 extends out of the slot 16 .
[0049] Furthermore, the housing 10 is provided with a bracket 17 on the front side of the slot 16 , and a gap is provided between the bracket 17 and the slot 16 .
[0050] Furthermore, the housing 10 includes a bottom shell 18 and a cover plate 19 . The cover plate 19 is disposed on the front side of the bottom shell 18 , and the buffer pad 15 is wrapped around the bottom shell 18 and / or the cover plate 19 .
[0051] Furthermore, the locking tongue block 60 is provided with a through hole, which is sleeved on the outside of the third bearing pin 14, and an axial oil groove 65 is provided in the through hole.
[0052] Furthermore, both sides of the second groove 63 of the locking tongue block 60 are wrapped with a first protective cover 66 , and the blocking portion 71 of the blocking point block 70 is wrapped with a second protective cover 73 .
[0053] When the present invention is used, the housing 10 and the lock bolt 80 are respectively mounted on the seat (not shown) and the backrest (not shown) of the car seat. Figure 12 The figure shows the unlocked state, that is, the lock bolt 90 is separated from the housing 10 and its notch 11, and the angle between the seat and the backrest can move freely within the allowable range of their connecting hinges (not shown in the figure). The upper end of the handle 20 is in a pressed-down state, and the first groove 22 of the handle 20 drives the pin 31 to move, thereby driving the stop hook 30 to rotate clockwise, and the first stop groove 33 of the stop hook 30 is lifted and separated from the lock tongue block 60. The right side of the stop hook 30 pushes the first protrusion 41 of the self-locking plate 40 to drive the self-locking plate 40 to rotate clockwise, and the limiting protrusion 42 of the self-locking plate 40 is lifted and separated from the lock tongue block 60. The support arm 32 of the stop hook 30 pushes the second protrusion 51 of the limiting plate 50 upward, causing the limiting plate 50 to rotate clockwise, and the second stop groove 52 is separated from the stop point block 70. In this way, the lock tongue block 60 and the stop point block 70 can rotate freely, allowing the lock bolt 80 to move freely.
[0054] like Figure 9 and Figure 10The figure shows the first locking position of the backrest lock. In the unlocked state, the backrest is directly pushed to drive the lock bolt 80, and after the lock bolt 80 is extended into the notch 11, the lock bolt 80 enters the second groove 63, pushing the lock tongue block 60 and the stop block 70 to rotate clockwise until the second stop groove 52 of the limit plate 50 presses against the upper left side of the stop block 70, limiting the counterclockwise rotation of the stop block 70. At this time, the first stop groove 33 of the stop hook 30 presses downward against the upper right side of the front lock claw 61, and the limiting protrusion 42 of the self-locking plate 40 presses against the right side of the front lock claw 61, limiting the clockwise rotation of the lock tongue block 60, so that the lock bolt 80 cannot move left and right under the restriction of the lock tongue block 60 and the stop block 70, so that the lock bolt 80 is locked in the first position.
[0055] like Figure 11 To adjust the backrest lock to the second gear locking position, when it needs to be adjusted to the second gear, first press down the upper end of the handle 20 to adjust the stop hook 30, the self-locking plate 40, and the limit plate 50 to the unlocked position, and then the seat back drives the lock bolt 80 to move to the inside of the notch 11 to the end of the notch 11, and the lock bolt 80 pushes the lock tongue block 60 to rotate counterclockwise in the second groove 63, and then the handle 20 is reset, and the first stop groove 33 of the stop hook 30 presses downward on the upper right side of the rear locking claw 62 of the lock bolt block 60, and the limiting protrusion 42 of the self-locking plate 40 presses on the right side of the rear locking claw 62, limiting the lock tongue block 60 from rotating clockwise, and limiting the lock bolt 80 between the rear locking claw 62 and the notch 11, so that the lock bolt 80 is locked in the second gear position. In the second-gear locking position, abnormal noise will be generated when the lock bolt 80 contacts the notch 11. Therefore, a buffer pad 15 is provided to prevent the lock bolt 80 from directly rubbing against the notch 11. The buffer pad 15 can be made of POM material, which has better impact resistance and is less susceptible to hot and cold changes than previous rubber materials. It is not prone to aging and wear, and can better buffer and clamp the lock bolt 80, thereby reducing abnormal noise.
[0056] Preferably, the handle torsion spring 23 biases the handle 20 clockwise, allowing it to rotate clockwise back to the locked position after the handle 20 is pressed down to unlock. The stop hook torsion spring 34 biases the stop hook 30 counterclockwise, and the self-locking plate torsion spring 43 biases the self-locking plate 40 counterclockwise, allowing the stop hook 30 and the self-locking plate 40 to automatically press down and lock the lock tongue block 60 after the handle 20 returns to the locked position. The limit plate torsion spring 53 biases the limit plate 50 clockwise, allowing it to automatically press down and lock the stop block 70 after the handle 20 returns to the locked position.
[0057] The lock tongue block torsion spring 64 biases the lock tongue block 60 in the clockwise direction, and the stop point block torsion spring 72 biases the stop point block 70 in the clockwise direction, so that when the lock bolt 80 enters the slot 11, the blocking portion 11 of the stop point block 70 can lean against the lock bolt, and when the lock bolt 80 exits the slot 11, the second groove 63 of the lock tongue block 60 and the blocking portion 71 of the stop point block 70 are reset to the entrance position of the slot 11.
[0058] The housing 10 includes a bottom shell 18 and a cover plate 19. The slot 16 can be provided on the cover plate 19. The second protrusion 51 of the limit plate 50 extends out of the cover plate 19. If the limit plate 50 becomes stuck and cannot switch between first and second gears, the limit plate 50 can be unlocked from the outside. The bracket 17 blocks the front of the slot 16 to prevent accidental operation. The two ends of the bracket 17 can be fixedly connected to the cover plate 19. The middle of the bracket 17 is raised, or the slot 16 of the cover plate 19 is recessed, so that a gap is formed between the middle of the bracket 17 and the slot 16, making it easier to use a tool to operate the second protrusion 51 through the gap.
[0059] When the backrest lock is unlocked, the lock tongue block torsion spring 64 pushes the lock tongue block 60 to rotate and reset. Since the lock tongue block 60 needs to push the lock bolt 80 to drive the seat back, the lock tongue block torsion spring 64 with a large elastic torque is required. Therefore, the lock tongue block 60 and the third bearing pin 14 may generate a large friction force, which is prone to wear. An oil groove 65 is provided in the through hole between the lock tongue block 60 and the third bearing pin 14. Lubricating oil can be stored in the oil groove 65, reducing the friction between the lock tongue block 60 and the third bearing pin, reducing wear and extending the service life.
[0060] The two sides of the second groove 63 of the lock tongue block 60 that is in direct contact with the lock bolt 80 and the outer side of the blocking part 71 of the blocking block 70 can be wrapped with a first protective cover 66 and a second protective cover 73 respectively. The first protective cover 66 and the second protective cover 73 can also be made of POM material to reduce the impact strength of the lock bolt 80, play a buffering role, and reduce abnormal noise.
Claims
1. A second-stage car seat back lock with a cushion, characterized in that: include: A housing (10), wherein the housing (10) is provided with a rightward notch (11), a first bearing pin (12) is provided on the right side above the notch (11), a second bearing pin (13) is provided on the left side above the notch (11), a third bearing pin (14) is provided below the notch (11), and a buffer pad (15) is provided at the left end of the notch (11); A handle (20), wherein the middle of the handle (20) is pivotally connected to the housing (10), and a first downward groove (22) is provided at the lower end of the handle (20); a stop hook (30), the stop hook (30) being rotatably sleeved on the first bearing pin (12), a transverse pin (31) being fixedly provided at the upper end of the stop hook (30), the pin (31) extending into the first groove (22), a support arm (32) being provided on the left side of the stop hook (30), and a first stop groove (33) being provided on the lower left side of the stop hook (30); A self-locking plate (40), the self-locking plate (40) being rotatably sleeved on the first bearing pin (12), the self-locking plate (40) being arranged on one side of the stop hook (30), the upper end of the self-locking plate (40) being provided with a first protrusion (41), the first protrusion (41) being located in the same plane as the stop hook (30) and being located above and to the right of the stop hook (30), and a limiting protrusion (42) being provided on the lower left side of the self-locking plate (40); a limiting plate (50), the limiting plate (50) being rotatably disposed on the second bearing pin (13), a second protrusion (51) being disposed on the upper right side of the limiting plate (50), the second protrusion (51) and the stop hook (30) being located in the same plane, and a second stop groove (52) being disposed on the lower right side of the limiting plate (50); A lock tongue block (60), wherein the lock tongue block (60) is rotatably sleeved on the third bearing pin (14), the lock tongue block (60) is located in a plane where the stop hook (30) and the self-locking plate (40) are located, the lock tongue block (60) is provided with a front lock claw (61) and a rear lock claw (62), the front lock claw (61) and the rear lock claw (62) pass through the notch (11) upward, a second groove (63) is provided between the front lock claw (61) and the rear lock claw (62), the upper right ends of the front lock claw (61) and the rear lock claw (62) cooperate with the first stop groove (33), and the right ends of the front lock claw (61) and the rear lock claw (62) cooperate with the limiting protrusion (42); A stop block (70) is rotatably sleeved on the third bearing pin (14), the stop block (70) and the limit plate (50) are in the same plane, a stop portion (71) is provided on the upper side of the stop block (70), the stop portion (71) passes upward through the notch (11), and the upper left end of the stop portion (71) is engaged with the second stop groove (52).
2. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: Pins (21) are provided on both sides of the middle of the handle (20), and the handle (20) is pivotally connected to the housing (10) via the pins (21). A handle torsion spring (23) is sleeved on the pin (21) on one side, and one end of the handle torsion spring (23) is connected to the handle (20) and the other end is connected to the housing (10). The handle torsion spring (23) biases the handle (20) in a clockwise direction.
3. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: The outer sleeve of the first bearing pin (12) is provided with a stop hook torsion spring (34) and a self-locking plate torsion spring (43), one end of the stop hook torsion spring (34) is connected to the stop hook (30), and the other end is connected to the housing (10), one end of the self-locking plate torsion spring (43) is connected to the self-locking plate (40), and the other end is connected to the housing (10), the stop hook torsion spring (34) biases the stop hook (30) in a counterclockwise direction, and the self-locking plate torsion spring (43) biases the self-locking plate (40) in a counterclockwise direction.
4. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: A limiting plate torsion spring (53) is provided on the outer sleeve of the second bearing pin (13), one end of the limiting plate torsion spring (53) is connected to the limiting plate (50), and the other end of the limiting plate torsion spring (53) is connected to the housing (10), and the limiting plate torsion spring (53) biases the limiting plate (50) in a clockwise direction.
5. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: The outer sleeve of the third bearing pin (14) is provided with a lock tongue block torsion spring (64) and a stop point block torsion spring (72), one end of the lock tongue block torsion spring (64) is connected to the lock tongue block (60), and the other end is connected to the housing (10), one end of the stop point block torsion spring (72) is connected to the stop point block (70), and the other end is connected to the housing (10), the lock tongue block torsion spring (64) biases the lock tongue block (60) in a clockwise direction, and the stop point block torsion spring (72) biases the stop point block (70) in a clockwise direction.
6. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: A slot hole (16) is provided on one side of the housing (10), and one end of the first protrusion (41) extends out of the slot hole (16).
7. The second-stage car seat back lock with a cushion as claimed in claim 6, characterized in that: The housing (10) is provided with a bracket (17) on the front side of the slot hole (16), and a gap is provided between the bracket (17) and the slot hole (16).
8. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: The housing (10) comprises a bottom shell (18) and a cover plate (19), wherein the cover plate (19) is arranged on the front side of the bottom shell (18), and the buffer pad (15) is wrapped on the bottom shell (18) and / or the cover plate (19).
9. The second-stage car seat back lock with a cushion as claimed in claim 1, characterized in that: The locking tongue block (60) is provided with a through hole, which is sleeved on the outside of the third bearing pin (14), and an axial oil groove (65) is provided in the through hole.
10. The second-speed car seat back lock with a cushion as claimed in claim 1, characterized in that: Both sides of the second groove (63) of the locking tongue block (60) are wrapped with a first protective cover (66), and the blocking portion (71) of the blocking point block (70) is wrapped with a second protective cover (73).