Two-gear backrest lock of automobile seat

Abstract

The utility model relates to the field of automobile accessories, in particular to an automobile seat, in particular to a second-gear backrest lock of the automobile seat, which is characterized in that a notch is arranged in the middle of a shell, a first bearing pin is arranged on the upper side of the notch, and a second bearing pin is arranged on the lower side of the notch; a connecting hole is formed in one end of the unlocking block, a transverse shaft is arranged at the other end of the unlocking block, cams are arranged at the two ends of the transverse shaft, and the unlocking block is pivotally connected with the shell; the first bearing pin is sleeved with the stopping locking claw and the comfortable piece, the stopping locking claw is provided with a stopping claw hook, grooves are formed in the upper sides of the stopping locking claw and the comfortable piece, and the comfortable piece is provided with a limiting protrusion; the second bearing pin is sleeved with the left pawl and the point blocking piece, and the left pawl is provided with a front claw hook and a rear claw hook. According to the two-gear backrest lock, the unlocking block is arranged to operate the stop locking claw and the comfortable piece to conduct unlocking, the connecting hole is formed in the unlocking block, handles of different styles can be connected with the connecting hole through the unlocking rod so as to adapt to unlocking of the two-gear backrest lock in different framework environments, and the design requirements of different handle styles are met.

Description

Technical Field

[0001] The utility model relates to the field of automobile accessories, in particular to an automobile seat, and more particularly to a second-gear backrest lock for an automobile seat. Background Art

[0002] In existing car seat two-speed seat back locks, the operating handle is mostly directly installed on the lock body. The user directly presses the handle to drive the lock claw to lock and unlock. Although the operation is simple, the position of the lock body is fixed and can only adapt to the installation of one skeleton structure. It cannot meet the design requirements of different cars that need to install two-speed seat locks and different styles of unlocking handles. Summary of the Invention

[0003] The purpose of the utility model is to provide a second-speed car seat backrest lock, which solves the technical problems in the prior art of being unable to adapt to the unlocking of the second-speed backrest lock in different skeleton environments and unable to meet the design requirements of different handle styles.

[0004] The second-stage car seat backrest lock of the utility model comprises:

[0005] A housing, wherein a notch is provided in the middle of the housing, a first bearing pin is provided on the upper side of the notch, and a second bearing pin is provided on the lower side of the notch;

[0006] An unlocking block, wherein one end of the unlocking block is provided with a connecting hole, the other end of the unlocking block is provided with a horizontal axis, one end of the horizontal axis is provided with a first cam, the other end of the horizontal axis is provided with a second cam, and the middle of the unlocking block is pivotally connected to the housing;

[0007] a stop pawl, the stop pawl being rotatably sleeved on the first bearing pin, a stop pawl hook being provided on the left side of the stop pawl, a first groove being provided on the upper side of the stop pawl, and the first cam extending into the first groove;

[0008] a comfort plate rotatably sleeved on the first bearing pin, a second groove being provided on the upper side of the comfort plate, the second cam extending into the second groove, and a limiting protrusion being provided on the left side of the comfort plate;

[0009] A safety plate is provided between the stop pawl and the comfort plate, the safety plate being rotatably sleeved on the first bearing pin, a third groove being provided on the upper side of the safety plate, the transverse axis extending into the third groove, and a limiting groove being provided on the left side of the safety plate;

[0010] a left pawl, the left pawl being rotatably sleeved on the second bearing pin, the left pawl being provided with a front claw hook and a rear claw hook, a fourth groove being provided between the front claw hook and the rear claw hook, the left pawl being located in the plane where the comfort plate and the safety plate are located, the right ends of the front claw hook and the rear claw hook being engaged with the limiting protrusion of the comfort plate, and the right upper ends of the front claw hook and the rear claw hook being engaged with the limiting groove of the safety plate;

[0011] The blocking piece is rotatably sleeved on the second bearing pin, the blocking piece is located in the plane where the stop lock claw is located, and a blocking part is provided on one side of the blocking piece, one end of the blocking part cooperates with the stop claw hook.

[0012] Furthermore, pins are provided on both sides of the middle of the unlocking block, and the unlocking block is pivotally connected to the shell through the pins. An unlocking block torsion spring is sleeved on the pin on one side, and the unlocking block is provided with a first torsion spring hole. One end of the unlocking block torsion spring is connected to the first torsion spring hole, and the other end is connected to the shell. The unlocking block torsion spring biases the unlocking block in a clockwise direction.

[0013] Furthermore, the first bearing pin outer sleeve is provided with a safety plate torsion spring and a comfort plate torsion spring, one end of the safety plate torsion spring is connected to the safety plate, and the other end is connected to the shell, one end of the comfort plate torsion spring is connected to the comfort plate, and the other end is connected to the shell, the safety plate torsion spring biases the safety plate in a counterclockwise direction, and the comfort plate torsion spring biases the comfort plate in a counterclockwise direction.

[0014] Furthermore, a stop pawl spring is provided on the right side of the stop pawl, one end of the stop pawl spring is connected to the stop pawl, and the other end of the stop pawl spring is connected to the housing, and the stop pawl spring biases the stop pawl in the counterclockwise direction.

[0015] Furthermore, the second bearing pin outer sleeve is provided with a stop point plate torsion spring and a left pawl torsion spring, a second torsion spring hole is provided on one side of the stop point plate, one end of the stop point plate torsion spring is connected to the second torsion spring hole, and the other end is connected to the shell, one end of the left pawl torsion spring is connected to the left pawl, and the other end is connected to the shell, the stop point plate torsion spring biases the stop point plate in a clockwise direction, and the left pawl torsion spring biases the left pawl in a clockwise direction.

[0016] Furthermore, a guide piece is provided at the right end of the front claw hook, and the guide piece is fixedly connected to the left pawl through a rivet pin.

[0017] Furthermore, a gasket is provided between the left pawl and the blocking plate, and the gasket is sleeved outside the second bearing pin.

[0018] Furthermore, the shell includes a lower shell, a cover plate and a connecting seat, the cover plate is installed on the front side of the lower shell, and the connecting seat is installed on the upper side of the lower shell.

[0019] Furthermore, both sides of the fourth groove of the left pawl are covered with a first protective cover, and the blocking portion of the blocking piece is covered with a second protective cover.

[0020] Compared with the existing technology, the present invention has a positive and significant effect. The present invention unlocks the lock by providing an unlocking block to operate the stop lock claw and the comfort plate in conjunction with the stop point plate and the left ratchet. A single action or two repeated actions of the unlocking block drive the stop lock claw, the comfort plate, the stop point plate and the left ratchet to lock the lock bolt in two positions. The unlocking block is provided with a connecting hole, and different handle styles can be connected to the connecting hole through the unlocking rod, so as to adapt to the unlocking of the second-speed backrest lock in different frame environments and meet the design requirements of different handle styles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the present utility model.

[0022] Figure 2 It is an exploded view of the present utility model.

[0023] Figure 3 It is a schematic diagram of the shell in the present utility model.

[0024] Figure 4 It is a schematic diagram of the unlocking block in the utility model.

[0025] Figure 5 It is a schematic diagram of the stop lock claw in the utility model.

[0026] Figure 6 It is a schematic diagram of the comfort sheet in the present utility model.

[0027] Figure 7 It is a schematic diagram of the safety piece in the present utility model.

[0028] Figure 8 It is a schematic diagram of the left pawl in the present utility model.

[0029] Figure 9 It is a schematic diagram of the blocking piece in the utility model.

[0030] Figure 10 It is a schematic diagram of the unlocked state of the utility model.

[0031] Figure 11 It is a schematic diagram of the first gear locking state of the utility model.

[0032] Figure 12 It is a schematic diagram of the second gear locked state of the utility model.

[0033] 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 lower shell, 15 is the cover plate, 16 is the connecting seat, 20 is the unlocking block, 21 is the connecting hole, 22 is the horizontal axis, 23 is the first cam, 24 is the second cam, 25 is the pin shaft, 26 is the first torsion spring hole, 27 is the unlocking block torsion spring, 30 is the stop pawl, 31 is the stop pawl hook, 32 is the first groove, 33 is the stop pawl spring, 40 is the comfort plate, 41 is the second groove, 42 is a limiting protrusion, 43 is a comfort plate torsion spring, 50 is a safety plate, 51 is a third groove, 52 is a limiting groove, 53 is a safety plate torsion spring, 60 is a left pawl, 61 is a front claw hook, 62 is a rear claw hook, 63 is a fourth groove, 64 is a guide plate, 65 is a rivet pin, 66 is a left pawl torsion spring, 67 is a first protective cover, 70 is a blocking plate, 71 is a blocking part, 72 is a blocking plate torsion spring, 73 is a second torsion spring hole, 74 is a second protective cover, 80 is a gasket, and 90 is a locking bolt. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited thereto.

[0035] like Figures 1-12 As shown, the utility model is a second-stage car seat backrest lock, comprising:

[0036] A housing 10 having a notch 11 in the middle thereof, a first bearing pin 12 disposed above the notch 11 and a second bearing pin 13 disposed below the notch 11;

[0037] An unlocking block 20 is provided with a connecting hole 21 at one end of the unlocking block 20, a horizontal shaft 22 is provided at the other end of the unlocking block 20, a first cam 23 is provided at one end of the horizontal shaft 22, and a second cam 24 is provided at the other end of the horizontal shaft 22. The middle of the unlocking block 20 is pivotally connected to the housing 10;

[0038] A stop pawl 30 is rotatably mounted on the first bearing pin 12 . A stop pawl hook 31 is provided on the left side of the stop pawl 30 . A first groove 32 is provided on the upper side of the stop pawl 30 . The first cam 23 extends into the first groove 32 .

[0039] A comfort piece 40 is rotatably mounted on the first bearing pin 12 . A second groove 41 is provided on the upper side of the comfort piece 40 . The second cam 24 extends into the second groove 41 . A limiting protrusion 42 is provided on the left side of the comfort piece 40 .

[0040] A safety plate 50 is disposed between the stop pawl 30 and the comfort plate 40 . The safety plate 50 is rotatably mounted on the first bearing pin 12 . A third groove 51 is provided on the upper side of the safety plate 50 , into which the transverse shaft 22 extends. A limiting groove 52 is provided on the left side of the safety plate 50 .

[0041] A left pawl 60 is rotatably sleeved on the second bearing pin 13. The left pawl 60 is provided with a front claw hook 61 and a rear claw hook 62. A fourth groove 63 is provided between the front claw hook 61 and the rear claw hook 62. The left pawl 60 is located in the plane where the comfort piece 40 and the safety piece 50 are located. The right ends of the front claw hook 61 and the rear claw hook 62 cooperate with the limiting protrusion 42 of the comfort piece 40, and the upper right ends of the front claw hook 61 and the rear claw hook 62 cooperate with the limiting groove 52 of the safety piece 50.

[0042] The blocking piece 70 is rotatably mounted on the second bearing pin 13 . The blocking piece 70 is located in the plane where the stop pawl 30 is located. A blocking portion 71 is provided on one side of the blocking piece 70 , and one end of the blocking portion 71 cooperates with the stop pawl hook 31 .

[0043] Furthermore, pins 25 are provided on both sides of the middle of the unlocking block 20, and the unlocking block 20 is pivotally connected to the shell 1 through the pins 25. An unlocking block torsion spring 27 is sleeved on the pin 25 on one side, and the unlocking block 20 is provided with a first torsion spring hole 26. One end of the unlocking block torsion spring 27 is connected to the first torsion spring hole 26, and the other end is connected to the shell 10. The unlocking block torsion spring 27 biases the unlocking block 20 in a clockwise direction.

[0044] Furthermore, the outer sleeve of the first bearing pin 12 is provided with a safety plate torsion spring 53 and a comfort plate torsion spring 43, one end of the safety plate torsion spring 53 is connected to the safety plate 50, and the other end is connected to the shell 1, one end of the comfort plate torsion spring 43 is connected to the comfort plate 40, and the other end is connected to the shell 1, the safety plate torsion spring 53 biases the safety plate 50 in the counterclockwise direction, and the comfort plate torsion spring 43 biases the comfort plate 40 in the counterclockwise direction.

[0045] Furthermore, a stop pawl spring 33 is provided on the right side of the stop pawl 30 , one end of the stop pawl spring 33 is connected to the stop pawl 30 , and the other end of the stop pawl spring 33 is connected to the housing 10 , and the stop pawl spring 33 biases the stop pawl 30 counterclockwise.

[0046] Furthermore, the outer sleeve of the second bearing pin 13 is provided with a stop point plate torsion spring 72 and a left pawl torsion spring 66. A second torsion spring hole 73 is provided on one side of the stop point plate 70. One end of the stop point plate torsion spring 72 is connected to the second torsion spring hole 73, and the other end is connected to the shell 1. One end of the left pawl torsion spring 66 is connected to the left pawl 60, and the other end is connected to the shell 10. The stop point plate torsion spring 72 biases the stop point plate 70 in the clockwise direction, and the left pawl torsion spring 66 biases the left pawl 60 in the clockwise direction.

[0047] Furthermore, a guide piece 64 is provided at the right end of the front claw hook 61 , and the guide piece 64 is fixedly connected to the left pawl 60 via a rivet pin 65 .

[0048] Furthermore, the housing 1 includes a lower shell 14 , a cover plate 15 and a connecting seat 16 . The cover plate 15 is installed on the front side of the lower shell 14 , and the connecting seat 16 is installed on the upper side of the lower shell 14 .

[0049] Furthermore, both sides of the fourth groove 63 of the left pawl 60 are covered with a first protective cover 67 , and the blocking portion 71 of the blocking piece 70 is covered with a second protective cover 74 .

[0050] The working principle of the present invention is that the housing 10 and the lock bolt 90 are respectively mounted on the seat (not shown) and the backrest (not shown) of the car seat. Figure 10 The figure shows the unlocked state, (that is, the lock bolt 90 is disengaged from the shell 10 and its slot 11, and the angle between the seat and the backrest can be freely adjusted within the allowable range of its connecting hinge (not shown in the figure)), the unlocking block 20 is in a downward pressed state (the user's external force acts on the connecting hole 21 at one end of the unlocking block 20 through an unlocking rod (not shown in the figure)), the bottom surfaces of the comfort plate 40 and the safety plate 50 are above the front claw hook 61 of the left pawl 60, the second groove 41 of the comfort plate 40 abuts against the horizontal axis 22 of the unlocking block 20, the third groove 51 of the safety plate 50 abuts against the second cam 24 of the unlocking block 20, and at the same time, the first cam 23 of the unlocking block 20 abuts against the first groove 32 of the stop lock claw 30, the stop claw hook 31 is lifted, and at the same time, the fourth groove 63 of the left pawl 60 is aligned with the outside of the slot 11.

[0051] like Figure 11 As shown, after the backrest drives the lock bolt 90 and extends the lock bolt 90 into the slot 11, the lock bolt 90 enters the fourth groove 63 of the left pawl 60 and pushes the left pawl 60 to rotate, and contacts the blocking portion 71 of the blocking piece 70 and simultaneously pushes the blocking piece 70 to rotate. When it reaches the first gear locking position, the stop claw hook 31 hooks one end of the blocking portion 71 to limit the counterclockwise rotation of the blocking piece 70, and the limiting protrusion 42 of the comfort piece 40 blocks the right end of the front claw hook 61 to limit the clockwise rotation of the left pawl 60, and the limiting groove 52 of the safety piece 50 is stuck on the right side of the front claw hook 61, thereby locking the lock bolt 90 in the first gear.

[0052] like Figure 12 As shown, when it is necessary to adjust to the second gear, the user's external force acts on the unlocking block 20 again through the unlocking lever, and the unlocking block 20 is pressed down through the connecting hole 21. The unlocking block 20 rotates counterclockwise, and the first cam 23 pushes the stop lock claw 30 to rotate clockwise through the first groove 32, and the stop lock hook 31 is lifted; the second cam 24 pushes the comfort plate 40 to rotate clockwise through the second groove 41, and the limiting protrusion 42 is lifted; the horizontal shaft 22 pushes the safety plate 50 to rotate clockwise through the third groove 51, and the limiting groove 51 is lifted. Lift up, thereby unlocking the left pawl 60 and the blocking piece 70, and the lock bolt 90 can move forward in the slot 11 to the end of the slot 11, and at the same time, the backrest drives the lock bolt 90, and the lock bolt 90 pushes the left pawl 60 to rotate counterclockwise in the fourth groove 63. After the left pawl 60 rotates into place, the limiting protrusion 42 of the comfort piece 40 and the limiting groove 52 of the safety piece 50 push down on the right side of the rear claw hook 62 to limit the counterclockwise rotation of the left pawl 60, and one end of the slot 11 and the rear claw hook 62 lock the lock bolt 90 in the second gear.

[0053] A first cam 23 and a second cam 24 are provided on either side of the transverse axis 22. The first cam 23 is larger than the second cam 24, and this controls the order of the unlocking action, causing the stop pawl 30 to rotate first, followed by the comfort plate 40, and finally the safety plate 50. When adjusting from first gear to second gear, the unlocking block 20 does not need to be fully lifted to unlock. Instead, the stop pawl 30 only needs to be moved until the stop hook 31 disengages from the blocking portion 71 of the blocking plate 70 to unlock. When the left pawl 60 rotates counterclockwise, the upper left end of the rear claw hook 63 can lift the comfort plate 40 and the safety plate 50. When full unlocking is desired, further downward pressure is applied to the unlocking block 20, causing the comfort plate 40 and the safety plate 50 to completely disengage from their locked position against the left pawl 60, thereby preventing accidental unlocking.

[0054] As a preference, one end of the unlocking block torsion spring 27 is connected to the unlocking block 20 through the first torsion spring hole 26. Figure 11 and Figure 12 In the locked state shown, the unlocking block torsion spring 27 is in the neutral position. When one end of the connecting hole 21 of the unlocking block 20 is pressed down, it can provide a driving force for the unlocking block 20 to rotate back in the clockwise direction, biasing the unlocking block 20 in the clockwise direction. The comfort plate torsion spring 43 can provide a driving force for the comfort plate 40 to rotate in the counterclockwise direction, the safety plate torsion spring 53 can provide a driving force for the safety plate 50 to rotate in the counterclockwise direction, and the stop pawl spring 33 can provide a driving force for the stop pawl 30 to rotate in the counterclockwise direction. Figure 11 and Figure 12 In the locked state, the comfort piece 40, the safety piece 50 and the stop lock claw 30 are respectively biased in the counterclockwise direction, and the left side is pressed down to make the locking more stable and prevent accidental unlocking.

[0055] One end of the blocking plate torsion spring 72 is connected to the blocking plate 70 through the second torsion spring hole 73. Figure 10 In the unlocked state shown, the blocking plate torsion spring 72 is in a neutral position, so that the blocking portion 71 of the blocking plate 70 is on the left side of the lock bolt 80 when the lock bolt 80 enters. After the lock bolt 80 contacts the blocking plate 70 and moves, the blocking plate torsion spring 72 provides a driving force for the blocking plate 70 to rotate back in the clockwise direction, so that the blocking plate 70 rotates back in the clockwise direction after unlocking. The left pawl torsion spring 66 provides a driving force for the left pawl 60 to rotate back in the clockwise direction, so that the left pawl 60 rotates back in the clockwise direction after unlocking. Figure 10 In this state, a protrusion can be provided on the housing 10 to limit the position of the left pawl 60. The gasket 80 is provided between the left pawl 60 and the blocking plate 70 to prevent the left pawl 60 from directly rubbing against the blocking plate 70.

[0056] The shell 1 can be in the form of a lower shell 14, a cover plate 15 and a connecting seat 16. The cover plate 15 is installed on the front side of the lower shell 14, and the connecting seat 16 is installed on the upper side of the lower shell 14. The two ends of the first bearing pin 12 and the second bearing pin 13 are respectively connected to the lower shell 14 and the cover plate 15. A cavity is formed between the lower shell 14 and the cover plate 15 to accommodate the components of the backrest lock. The lower shell 14 and the cover plate 15 are respectively grooved to form a notch 11, and the unlocking block 20 is pivotally connected to the connecting seat 16.

[0057] The guide block 64 guides the bolt 90 as it enters the notch 11, preventing it from suddenly impacting the left pawl 60. Since the fourth groove 63 of the left pawl 60 and the blocking portion 71 of the blocking plate 70 need to directly contact and rub against the bolt 90, a first protective cover 67 is preferably provided on both sides of the fourth groove 63 of the left pawl 60, and a second protective cover 74 is provided on the outer side of the blocking portion 71 of the blocking plate 70 to improve wear resistance.

[0058] The utility model can operate the unlocking block 20 to be pressed down to unlock by connecting the external unlocking rod with the connecting hole 21 in the unlocking block 20. The unlocking rod can be connected with handles of different styles to adapt to the unlocking of the second-speed backrest lock in different skeleton environments, meet the design requirements of different handle styles, and improve the compatibility of the backrest lock.

Claims

1. A second-stage car seat backrest lock, characterized in that: include: A housing (10), wherein a notch (11) is provided in the middle of the housing (10), a first bearing pin (12) is provided on the upper side of the notch (11), and a second bearing pin (13) is provided on the lower side of the notch (11); An unlocking block (20), wherein one end of the unlocking block (20) is provided with a connecting hole (21), the other end of the unlocking block (20) is provided with a transverse axis (22), one end of the transverse axis (22) is provided with a first cam (23), the other end of the transverse axis (22) is provided with a second cam (24), and the middle of the unlocking block (20) is pivotally connected to the housing (10); A stop pawl (30) is rotatably sleeved on the first bearing pin (12), a stop pawl hook (31) is provided on the left side of the stop pawl (30), a first groove (32) is provided on the upper side of the stop pawl (30), and the first cam (23) extends into the first groove (32); A comfort piece (40) is rotatably sleeved on the first bearing pin (12), a second groove (41) is provided on the upper side of the comfort piece (40), the second cam (24) extends into the second groove (41), and a limiting protrusion (42) is provided on the left side of the comfort piece (40); A safety plate (50) is provided between the stop lock claw (30) and the comfort plate (40), the safety plate (50) is rotatably sleeved on the first bearing pin (12), a third groove (51) is provided on the upper side of the safety plate (50), the transverse shaft (22) extends into the third groove (51), and a limiting groove (52) is provided on the left side of the safety plate (50); A left ratchet (60), the left ratchet (60) being rotatably sleeved on the second bearing pin (13), the left ratchet (60) being provided with a front claw hook (61) and a rear claw hook (62), a fourth groove (63) being provided between the front claw hook (61) and the rear claw hook (62), the left ratchet (60) being located in the plane where the comfort sheet (40) and the safety sheet (50) are located, the right ends of the front claw hook (61) and the rear claw hook (62) being engaged with the limiting protrusion (42) of the comfort sheet (40), and the right upper ends of the front claw hook (61) and the rear claw hook (62) being engaged with the limiting groove (52) of the safety sheet (50); A blocking piece (70) is rotatably sleeved on the second bearing pin (13), the blocking piece (70) is located in the plane where the stop lock claw (30) is located, and a blocking portion (71) is provided on one side of the blocking piece (70), and one end of the blocking portion (71) is matched with the stop claw hook (31).

2. The second-stage car seat backrest lock according to claim 1, characterized in that: Pins (25) are provided on both sides of the middle of the unlocking block (20), and the unlocking block (20) is pivotally connected to the housing (10) through the pins (25). An unlocking block torsion spring (27) is sleeved on the pin (25) on one side, and the unlocking block (20) is provided with a first torsion spring hole (26). One end of the unlocking block torsion spring (27) is connected to the first torsion spring hole (26), and the other end is connected to the housing (10). The unlocking block torsion spring (27) biases the unlocking block (20) in a clockwise direction.

3. The second-stage car seat backrest lock according to claim 1, characterized in that: The outer sleeve of the first bearing pin (12) is provided with a safety plate torsion spring (53) and a comfort plate torsion spring (43); one end of the safety plate torsion spring (53) is connected to the safety plate (50), and the other end is connected to the housing (10); one end of the comfort plate torsion spring (43) is connected to the comfort plate (40), and the other end is connected to the housing (10); the safety plate torsion spring (53) biases the safety plate (50) in a counterclockwise direction, and the comfort plate torsion spring (43) biases the comfort plate (40) in a counterclockwise direction.

4. The second-stage car seat backrest lock according to claim 1, characterized in that: A stop pawl spring (33) is provided on the right side of the stop pawl (30), one end of the stop pawl spring (33) is connected to the stop pawl (30), and the other end of the stop pawl spring (33) is connected to the housing (10). The stop pawl spring (33) biases the stop pawl (30) in a counterclockwise direction.

5. The second-stage car seat backrest lock according to claim 1, characterized in that: The outer sleeve of the second bearing pin (13) is provided with a blocking plate torsion spring (72) and a left ratchet torsion spring (66); a second torsion spring hole (73) is provided on one side of the blocking plate (70); one end of the blocking plate torsion spring (72) is connected to the second torsion spring hole (73), and the other end is connected to the housing (10); one end of the left ratchet torsion spring (66) is connected to the left ratchet (60), and the other end is connected to the housing (10); the blocking plate torsion spring (72) biases the blocking plate (70) in a clockwise direction, and the left ratchet torsion spring (66) biases the left ratchet (60) in a clockwise direction.

6. The second-stage car seat backrest lock according to claim 1, characterized in that: A guide piece (64) is provided at the right end of the front claw hook (61), and the guide piece (64) is fixedly connected to the left ratchet (60) via a rivet pin (65).

7. The second-stage car seat backrest lock according to claim 1, characterized in that: A gasket (80) is provided between the left ratchet (60) and the blocking plate (70), and the gasket (80) is sleeved outside the second bearing pin (13).

8. The second-stage car seat backrest lock according to claim 1, characterized in that: The housing (10) comprises a lower shell (14), a cover plate (15) and a connecting seat (16), wherein the cover plate (15) is mounted on the front side of the lower shell (14), and the connecting seat (16) is mounted on the upper side of the lower shell (14).

9. The second-stage car seat backrest lock according to claim 1, characterized in that: The first protective sleeve (67) is sheathed on both sides of the fourth groove (63) of the left ratchet (60), and the blocking portion (71) of the blocking piece (70) is sheathed with a second protective sleeve (74).

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