JPH0631958Y2 - Reclining device - Google Patents

Description

[Technical Field] The present invention relates to a reclining device that adjusts a tilt angle of a vehicle seat, and more particularly to a structure of a stopper pin that stops the seat at the frontmost tilted position.

"Prior art and its problems" This type of reclining device is a lower arm fixed to a side surface of a cushion seat, and a side of a seat back that is pivotally attached to the lower arm and tilts forward and backward with respect to the lower arm. It has a fixed upper arm, and has a structure in which this upper arm is stopped by a stopper pin at the frontmost tilted position. Conventionally, the stopper pin has been formed independently, and is normally located in a state of slightly protruding above the lower arm in the vicinity of the pivotal attachment portion of the upper arm. Therefore, when an occupant is seated on or off the cushion seat, the stopper pin or the vicinity of the bulge of the lower arm may touch the buttocks, which causes a problem in getting on and off. In addition, if the stopper pin is formed independently, an extra number of parts is required for that amount, and since the formation position is also on the upper part of the lower arm to prevent interference with other mechanisms, the tilt angle of the upper arm at the most forward tilted position Becomes shallow.

The purpose of the invention The present invention solves the problems of such a reclining device, has a good feeling of sitting on and taking off from the cushion seat, has a small number of parts, and has a deep inclination angle of the upper arm in the foremost tilted position. An object of the present invention is to obtain a reclining device that can be used.

[Outline of the Invention] The present invention was made as a result of reexamination of the conventional technical common sense that an independent stopper pin is required to regulate the frontmost tilted position of the upper arm.

That is, the present invention is characterized in that the stopper pin is also used as the swing shaft of the pole of the ratchet mechanism that allows the upper arm to tilt forward and backward.

"Embodiment of the Invention" The present invention will be described below with reference to illustrated embodiments. In FIG. 1, C is a cushion seat, B is a seat back, and the reclining mechanism 10 has a lower arm 11 fixed to the side surface of the cushion seat C and an upper arm 12 fixed to the side surface of the seat back B. There is. The upper arm 12 is pivotally attached to the lower arm 11 by a hinge pin 13 so as to be tiltable forward and backward, and a ratchet plate 14 having an arcuate locking tooth 14a centered on the hinge pin 13 is fixed to the lower part of the upper arm 12. Has been done. Further, the lower arm 11 is an upper rail 15 of the seat track device.
It is fixed to. The upper rail 15 has its longitudinal direction (left and right direction in FIG. 1) relative to the lower rail 16 of the same device.
Can be slid onto.

A biasing force transmission plate 17 is pivotally mounted on the hinge pin 13 coaxially with the ratchet plate 14, and the ratchet plate 14 has an engagement recess 14b engaged with an engagement projection 17a at one end of the biasing force transmission plate 17. There is. The spring hooking protrusion 17b at the other end of the urging force transmitting plate 17 has
The spiral spring 18 whose winding start end is hooked on the hinge pin 13 is hooked at the winding end. This spiral spring 18 is provided with a biasing force transmission plate 17
The upper arm 12 is rotationally biased in the forward tilting direction via the.

An operation lever 20 is also pivotally attached to the hinge pin 13, and the lower arm 11 near the hinge pin 13 has
A pole 25 having a lock tooth 25a that engages and disengages with the locking tooth 14a is pivotally attached by a pole hinge pin 26. The operating lever 20, the pole 25, and the ratchet plate 14 constitute a ratchet mechanism that allows the upper arm 12 to rotate and locks the upper arm 12 at the position after the rotation. Pole 25
A cam groove 27 is formed in the control lever 20, and a roller 21 engageable with the cam groove 27 is planted in the operation lever 20. The roller 21 is movable around the hinge pin 13 within the range of the effective length of the circular arc hole 22 formed in the lower arm 11. A tension spring 23 is stretched between the operation lever 20 and the lower part of the lower arm 11. The tension spring 23 does not normally engage the operation lever 20 with its roller 21 in the cam groove 27. The pole 25 via the roller 21 is urged to rotate in the direction in which the lock tooth 25a is engaged with the locking tooth 14a. Therefore, when the operation lever 20 rotates about the hinge pin 13 against the force of the tension spring 23, the roller 21 engages with the cam groove 27 to rotate the pawl 25, and the locking tooth 25a with respect to the locking tooth 14a. Disengage.
The upper arm 12 is now in a state of being rotatable to the forward and backward tilting positions shown by the imaginary line in FIG.

The present invention is characterized in that the pole hinge pin 26, which is the rotation axis of the pole 25, simultaneously functions as a stopper that regulates the rotation angle when the upper arm 12 is tilted forward. That is, the pole hinge pin 26 is
It also serves as the stopper pin SP in the conventional device, which is added to the phantom line in FIG. This allows the stopper pin
The SP is unnecessary and the number of parts can be reduced accordingly. Moreover, since the upper portion of the lower arm 11 that is protruding because the stopper pin SP is formed can also be configured by a smooth curve without a protruding portion as shown by the solid line, the passenger on the cushion seat C can be prevented. Interference with the buttocks is eliminated at the time of seating / seating and the seating / seating properties are improved.
Furthermore, the pole hinge pin 26 is a conventional stopper pin.
Since it is located below the SP, the inclination of the upper arm 12 becomes deep at the time of the most forward tilt, and a large vehicle interior space can be secured.

The pole hinge pin 26 has sufficient rigidity and strength against a collision of the upper arm 12, and an elastic cushion material 30 made of rubber or the like is attached around the pole hinge pin 26. The cushion material 30 absorbs an impact load when the upper arm 12 is pushed forward and collided by the force of the spiral spring 18.

The reclining device having the above-described structure is always used for the tension spring 2
Since the lock teeth 25a of the pawl 25 mesh with the locking teeth 14a of the ratchet plate 14 via the roller 21 by the force of 3, the upper arm 12 is fixed to the lower arm 11. On the other hand, when the operation lever 20 is pulled up against the force of the tension spring 23, the roller 21
Moves in the circular arc hole 22 and engages with the cam groove 27 to rotate the pole 25 to lock the lock tooth 2 with respect to the locking tooth 14a.
Remove the mesh of 5a. As a result, the upper arm 12 is free to rotate about the hinge pin 13, and the angle of the seat back B can be adjusted in either forward or backward direction.

In this state, when the pressing force against the seat back B against the urging force of the spiral spring 18 is released, the urging force of the spiral spring 18 causes the urging force transmission plate 1 to move.
7. Through the ratchet plate 14, the upper arm 12 integrated with the ratchet plate 14 swivels forward in the forward direction and collides with the pole hinge pin 26. Thus, the seat back B is stopped at the frontmost position with respect to the cushion seat C. At this time, the cushion material 30 absorbs the impact at the time of a collision and reduces the impact on the angle adjusting mechanism inside the upper arm 12.

When the operation lever 20 is released after the angle of the seat back B is adjusted, the engagement of the roller 21 with the cam groove 27 is released by the force of the tension spring 23, and at the same time, the roller 21 moves to the pole 2.
5 is pressed, the lock teeth 25a again mesh with the locking teeth 14a, and the seat back B is fixed at that position.

In order to finely adjust the tilt angle of the upper arm 12,
Inside the upper arm 12, around the hinge pin 13,
It is known to incorporate an angle fine adjustment mechanism or the like configured by a well-known drive gear mechanism such as a Taumel gear, but the present invention can be similarly applied to a reclining device incorporating these fine adjustment mechanisms.

[Advantage of the Invention] As described above, according to the present invention, the stopper pin that regulates the forward tilting position of the upper arm is also used as the swing shaft of the pole that allows the upper arm to tilt forward and backward. Is unnecessary, and it is possible to eliminate the protrusion of the upper portion of the lower arm caused by the formation of the stopper pin. Therefore, the number of parts can be reduced, and the seat cushion can be attached to and detached from the seat cushion well. Further, since the position where the upper arm is stopped at the frontmost position is lowered, the frontmost tilt angle of the upper arm is deepened.

[Brief description of drawings]

FIG. 1 is a side view of an essential part of the reclining device of the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. 11 ... Lower arm, 12 ... Upper arm, 13 ...
Hinge pin, 14 ... Ratchet plate, 14a ...
Locking teeth, 17 ... biasing force transmitting plate, 18 ... spiral spring, 20 ... operating lever, 21 ... roller, 23 ... tension spring, 25 ... pole, 25a ... lock tooth, 26 ... pole Hinge pin, 27 ... Cam groove,
30 ... Cushion material.

Claims (2)

[Scope of utility model registration request] 1. A lower arm fixed to a side surface of a cushion seat, an upper arm pivotally attached to the lower arm, tilted forward and backward with respect to the lower arm, fixed to a side surface of a seat back, and a pivot of the upper arm. A ratchet mechanism that has a pole that is rotatable about the swing shaft and that engages and disengages with the ratchet teeth that are coaxial with the landing axis, and that restricts the foremost position of the upper arm, and the ratchet mechanism that allows or blocks the rotation of the pole. A reclining device having a stopper pin, wherein the stopper pin is also used as a swing shaft of a pole of the ratchet mechanism. 2. The reclining device according to claim 1, wherein a cushion material that absorbs a shock with the upper arm is provided on the swing shaft of the pole.