JPS6312011B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicular seat reclining device, and more particularly to a vehicular seat reclining device capable of fully tilting the seat back forward relative to the seat and finely adjusting the seat back to a fully backward tilting position.

In a conventional seat reclining device for a vehicle of this type, a plurality of engagement grooves are provided in the seat cushion bracket, and a pin that can be engaged with the engagement grooves is provided in the connecting member to operate the operating lever. In response, the inclination angle of the seat back is adjusted by engaging and disengaging the engagement groove of the seat cushion bracket with the pin of the connecting member. It is difficult to increase the adjustment angle, and it is difficult to obtain the optimal seatback inclination angle according to the passenger's preference.If a large number of engagement grooves are provided in the seat cushion bracket in order to reduce the adjustment angle, it is difficult to This has the disadvantage that the strength of the seat reclining device is significantly reduced.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a seat reclining device for a vehicle that is novel and has a simple structure, which eliminates the above-mentioned drawbacks.

An embodiment of the present invention will be described below based on the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a vehicle seat reclining device, and the device 10 is composed of a seat 11, a seat back 12, and an inclination angle adjustment mechanism 13 for the seat back 12.

The inclination angle adjustment mechanism 13 according to the present invention will be explained below based on FIG. 2.

14 indicates a seat bracket fixed to the seat 11, and 15 indicates a seat back bracket fixed to the seat bag 12. Reference numeral 16 indicates an intermediate bracket, one end of which is rotatably supported on the seat bracket 14 through a first hinge shaft 17 implanted in the seat bracket 14, and the other end is connected to the seat back bracket 15.
The seat back bracket 15 is rotatably supported by a second hinge shaft 18 implanted in the seat back bracket 15.

The operating handle 19 has an operating portion 20 at one end, a cam groove 21 and a notch 22 at the other end, is rotatably supported on the seat bracket 14 by a shaft 23, and is rotated by a spring 24 about the shaft 23 as a fulcrum. Forced clockwise. Reference numeral 25 indicates a first pawl, and the first pawl 25 has one end rotatably supported on the seat bracket 14 by a shaft 26, and has a plurality of teeth 27 and a pin 28 at the other end. The pin 28 of the first pole 25 is the operating handle 1
It is locked in the cam groove 21 of No.9. A fan-shaped latch 30 having a plurality of teeth 29 on an arc centered on the first hinge axis 17 is fixed to one end of the intermediate bracket 16. The teeth 29 of the latch 30 are engageable with the teeth 27 of the first pawl 25. Reference numeral 31 indicates a cam ring, one end of which is rotatably supported on the shaft 23, and the other end has a cam portion 33 that can be engaged with the cam surface 32 of the first pawl 25. Since a pin 34 is implanted and the pin 34 is fitted to the other end of the operating handle 19, the cam ring 31 similarly rotates in the same direction about the shaft 23 as a fulcrum in response to the rotation operation of the operating handle 19. . Reference numeral 35 indicates a connecting link, and one end of the connecting link 25 is fixed to a shaft 36, and the other end is provided with a pin 37 that can be engaged with a notch 22 provided at the other end of the operating handle 20. . Therefore, as the operating handle 19 is rotated, the notch 22 of the operating handle 19 and the pin 37 of the connecting link 35 are rotated, and the shaft 36 is rotated to rotate the seat reclining device 10 for the vehicle. A similar rotational force is transmitted to the inclination angle adjustment mechanism of the seat back 12 provided on the other side. This mechanism is particularly effective when used with a seat for two or three people.

Reference numeral 37 denotes a spiral spring whose one end is locked to a cut-out portion 38 from the window of the intermediate bracket 16 and the other end is locked to the first hinge shaft 17. The intermediate bracket 16 is biased counterclockwise.

39 is a shaft 40 installed in the intermediate bracket 16
2 shows a substantially L-shaped second pole rotatably supported at the other end of the intermediate bracket 16. A flange 41 is provided at one end of the second pole 39, and the flange 41 can be engaged with a protrusion 42 provided on the seat bracket 14, and the other end can be engaged with a protrusion 42 provided on one end of the seat back bracket 15. pin 4
An engagement groove 44 that can be engaged with 3 is formed. 4
Reference numeral 5 designates a spring whose one end is engaged with the second pawl 39 and the other end is engaged with the intermediate bracket 16, and the spring 45 is inserted into the engagement groove 44 of the second pawl 39 with the engagement pin 43 of the seatback bracket 15. In other words, the direction in which the second pole 39 is engaged with the shaft 4
It is biased clockwise with 0 as the fulcrum.

To explain the operation below, in the state shown in the second figure, the teeth 27 of the first pawl 25 and the teeth 29 of the fan-shaped latch 30 engage, and the engagement pin 43 of the seat back bracket 15 and the engagement groove 44 of the second pawl 39 engage with each other. are engaged, so the seat back bracket 15
is restricted from rotating with respect to the intermediate bracket 16, and maintains the inclination angle shown in FIG.

Seat back bracket 1 of seat back 12
5 in the backward tilting direction from the state shown in the second figure, rotate the operating handle 19 clockwise about the shaft 23, and the cam groove 2 of the operating handle 19
Pin 2 of the first pole 25 located below 1
8 is guided by the cam groove 21 and is displaced above the cam groove 21 to engage the teeth 27 of the first pawl 25 in the fan-shaped latch 3.
0 tooth 29 in the releasing direction. Prior to this, the cam surface 32 of the first pawl 25 has been released from the cam portion 33 of the cam link 31, so the first
The pawl 25 rotates clockwise about the shaft 26, and the teeth 27 of the first pawl 25 are released from the teeth 29 of the sector latch 30. Intermediate bracket 1
6 and the seat back bracket 15 are connected to the engagement groove 44 of the second pole 39 and the seat back bracket 15.
rotates integrally while maintaining engagement with the engagement pin 43. At this time, the seat angle is adjusted by applying force to the seat back bracket 15 using the first hinge shaft 17 as a fulcrum, and the shaft 2 of the operating handle 19
3 as a fulcrum, the teeth 27 of the pawl 25 can be selectively engaged with the teeth 29 of the fan-shaped latch 30, and the inclination angle of the seat back 12 can be finely adjusted. Then, the seat bag 12 is completely tilted back so as to be in a straight line with the seat 11.

Next, in order to completely tilt the seat back bracket 15 of the seat back 12 forward from the state shown in the second figure, rotate the operating handle 19 clockwise about the shaft 23 in the same way as adjusting the inclination angle described above. Then, the pin 28 of the first pawl 25, which was located below the cam groove 21 of the operating handle 19, is guided by the cam groove 21 and is displaced above the cam groove 21, causing the teeth 27 of the first pawl 25 to engage the fan-shaped latch. 30 teeth 29 in the releasing direction. Prior to this, the cam surface 32 of the first pawl 25 is released from the cam portion 33 of the cam link 31, and then the first pawl 25
rotates clockwise about the shaft 26, and the teeth 27 of the first pawl 25 are released from the teeth 29 of the sector latch 30. 1st seat back bracket 15
By applying a force using the hinge shaft 17 as a fulcrum, the intermediate bracket 16 becomes rotatable counterclockwise about the first hinge shaft 17, and begins to rotate forward due to the biasing force of the spiral spring 37. On the other hand, the flange 41 of the second pawl 39 is engaged with the pin 43 of the seat back bracket 15 due to the clockwise biasing force of the spring 45, but since the flange 41 is locked with the protrusion 42 of the seat bracket 14, In response to the counterclockwise rotation of the intermediate bracket 16 about the first hinge shaft 17, the shaft 40 of the second pawl 39 moves to the left and
The pawl 39 is forced to rotate counterclockwise about the engagement portion between the flange 41 of the second pawl 39 and the protrusion 42 of the seat bracket 14 as a fulcrum. Therefore, the engagement pin 43 of the seat back bracket 15
is released from the engagement groove 44 of the second pawl 39, the seat back bracket 15 can freely rotate counterclockwise about the second hinge shaft, and the seat back 12 is completely tilted forward so as to overlap the seat 11. The tilt angle can be adjusted to the position.

As described above, in the present invention, one end is pivotally supported to the seat bracket on the seat side by the first hinge shaft, and the other end is pivotally supported to the seat back bracket on the seat back side by the second hinge shaft. the intermediate bracket is provided, a sector-shaped latch is provided at one end of the intermediate bracket, a second pole is pivotally supported at the other end, and in response to operation of the operating lever, the first pole pivoted to the seat bracket and the sector-shaped latch are connected to each other; At the same time, the engagement between the second pawl and the engagement portion of the seatback bracket is released, and the seatback is finely adjusted to the fully rearward position using the first hinge shaft as a fulcrum. Since the seat back is adjusted to the fully forward tilted position using the seat back as a fulcrum, the inclination angle of the seat back can be finely adjusted to the optimum position according to the occupant's preference.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of the apparatus of the present invention, and FIG. 2 is an explanatory diagram showing one embodiment of the apparatus of the present invention. 10: Vehicle seat reclining device, 1
1: seat, 12: seat back, 13: tilt angle adjustment mechanism, 14: seat bracket, 15: seat back bracket, 16: intermediate bracket, 1
7: First hinge axis, 18: Second hinge axis, 19:
Operation handle, 25: first pole, 29: multiple teeth, 30: latch, 37: intermediate bracket, 3
9: second pole, 43: engagement pin, 44: engagement groove.

Claims (1)

[Claims] 1. A seat bracket fixed to the seat, a seat back bracket fixed to the seat back, and a seat back bracket rotatably supported by a first hinge shaft embedded in the seat bracket and embedded in the seat back bracket. an intermediate bracket rotatably supported on a second hinge shaft; an operating lever rotatably supported on the seat bracket; a latch having a plurality of teeth fixed to the intermediate bracket; The latch is rotatably supported by the seat bracket, and is always engaged with the latch, and is disengaged from the latch by operating the operating handle, thereby moving the seat back along with the seat back bracket and the intermediate bracket to the first hinge shaft. a first pawl that is rotatable back and forth around the center; and a first pawl that is rotatably supported on the intermediate bracket and arranged so as to be able to come into contact with the seat bracket, and that is constantly engaged with the seat back bracket and that is connected to the first hinge of the seat back. a second pawl that releases the engagement with the seat back bracket upon contact with the seat back frame due to forward movement about the axis, and allows the seat back to move forward about the second hinge axis; Vehicle seat reclining device.