JPH10272028A - Reclining device - Google Patents

Abstract

(57) [Summary] The object of the present invention is to gradually reduce the return speed when the seat back is returned from the backward inclined state by the accumulation of the return spring composed of a spiral spring. A brake band (3) having one end fixed to a lower arm (8) side is wound around a drum (2) which rotates together with an upper arm (7) and accommodates a return spring (1). I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining device for adjusting a tilt angle of a seat back (backrest) in a vehicle seat (seat), and more particularly, to return the seat back from a rearwardly inclined state to a forwardly inclined state. The present invention relates to a reclining device for reducing a speed of returning a seat back at the time.

[0002]

2. Description of the Related Art A conventional reclining device is provided with a return spring composed of a spiral spring for urging a seat back in a forward direction over a lower arm on a seat cushion side and an upper arm on a seat back side. There is something. In this reclining device, the return spring is wound and tightened by tilting the seat back backward, so that when the lock of the upper arm to the lower arm is released and the seat back is returned from the backward tilted state to the forward tilted state, it is tightened. The seat back suddenly returns due to the stored energy of the return spring, which gives a strong impact to the occupant.

In order to eliminate such a problem, there has been disclosed a brake spring including a wrap winding spring having a biasing force in a direction opposite to that of the return spring, provided together with the return spring (for example, Japanese Utility Model Application Laid-Open Publication No. H10-163,881). 6
3-142140).

[0004]

The forward leaning speed of the return spring is reduced by the brake spring, but the speed is substantially constant and slow. for that reason,
Since the seat back is not immediately returned to the upright standing state, there is a problem that the occupant feels irritated.

In order to eliminate such a problem, the applicant of the present application has disclosed in Japanese Utility Model Laid-Open Publication No. 7-11942 that a rotating shaft is attached to one of a lower arm on a seat cushion side and an upper arm on a seat back side, and a pin is attached to the other. The base end of the link is fixed to the rotating shaft, and a long guide hole is provided at the distal end of the link in the longitudinal direction of the link, the pin is engaged in the long guide hole, and a disk is attached to the rotating shaft. A reclining device in which a plate is fixed, a friction material is joined to the disk plate, and the friction material is fixed to a fixing member provided on a lower arm or an upper arm side to which a rotating shaft is attached has been proposed.

However, it has been found that the disk plate and the friction material are worn by the long-term use of the reclining device, and the initial purpose cannot be achieved for a long time. Therefore, an object of the present invention is to eliminate such disadvantages of the conventional product and to reduce the size.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a reclining device according to the present invention is configured such that a brake band is wound around a drum that rotates together with the upper arm and houses the return spring. The brake band has one end fixed to the lower arm side and the other end urged in the drum tightening direction by the elastic force of a spring, so that the damping force against the forward rotation of the seat back is reduced with respect to the rearward rotation. It is characterized by becoming large.

When the seat back is returned from the backward tilted state to the forward tilting direction, the drum rotates forward with the upper arm on the seat back side. Since this force acts on the drum in the direction of winding the drum, the frictional force (damping force) between the outer peripheral surface of the drum and the brake band gradually increases. Therefore, the return speed of the seat back gradually decreases in the forward leaning direction.

Conversely, when the seat back is rotated in the backward tilt direction, the drum rotates in the reverse direction, so that the tightening force of the brake band on the drum is reduced, and the speed of returning to the rear is increased.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. 1 and 2 show a reclining device according to the present invention, in which (8) shows a lower arm fastened to a frame of a seat cushion, and (7) shows an upper arm fastened to a frame of a seat back.

The upper arm (7) is pivotally mounted on a pivot (80) fixed to the lower arm (8) so as to be rotatable in the front-rear direction, similarly to the conventional reclining device.
0) and a return spring (1) composed of a spiral spring whose end is locked to a locking pin (70) of the upper arm (7), the upper arm (7) is urged in a forward, forward tilting direction. ing. Also, upper arm (7)
Is a known lock mechanism (82) on the lower arm (8) side.
When the locked state is released, the upper arm (7) and the seat back integrated with the upper arm (7) are configured to rotate forward by the elasticity of the return spring (1). .

As described above, the return spring (1) has one end (1B) hooked on the pivot (80) and the other end (1A) hooked on the locking pin (70) fixed to the upper arm (7). And housed in the drum (2).

The drum (2) is a lid formed on one side so as to be open and capable of accommodating the return spring (1) therein, and has a locking hole (2) through which the locking pin (70) is inserted.
7) and a through hole (28) through which the pivot (80) is inserted. Accordingly, the drum (2) is configured to rotate together with the upper arm (7) by the locking pin (70) around the pivot (80).

On the other hand, the outer surface of the drum (2) is substantially U-shaped.
A brake band (3) bent in the shape of a letter is wound, and one end (3B) of the brake band (3) is connected to a lower arm (8).
The other side (3A) is urged by a spring (5) (compression spring) in the direction in which the brake band (3) is tightened against the drum (2).

That is, both ends (3) of the brake band (3)
A) and (3B) are inserted through a bolt (4), and the tip of the bolt (4) is screwed to a mounting bracket (64) welded to the inner surface of a housing (6) fixed to a lower arm (8). Both ends (3A) and (3B) of the brake band (3) are between the screwed portion and the head of the bolt (4).
, One end (3B) is engaged with the mounting bracket (64), the other end (3A) is axially movably mounted on the bolt (4) in the axial direction, and the other end (3B) of the brake band (3). 3
The spring (5) having a predetermined elasticity is tightened between A) and the head of the bolt (4).

Therefore, the other end (3A) of the brake band (3) is pressed by the elastic force of the spring (5), and urges the brake band (3) in the direction of tightening the drum (2).

Accordingly, as shown in FIG. 3, when the seat back is returned from the backwardly inclined state to the forwardly inclined direction by the elastic force of the return spring (1), the return spring (1).
The seat back suddenly pivots forward and tries to return due to the elasticity due to the accumulated energy of the drum, but the drum (2) pivots in the direction A (clockwise) in conjunction with the forward rotation of the seat back. I do. The turning force of the drum (2) in the direction A acts on the brake band (3) in the direction of winding the drum (2).

Therefore, as the seat back rotates forward, the frictional force between the brake band (3) and the outer peripheral surface of the drum (2) increases, and the speed of returning to the front of the seat back gradually decreases. Become.

When the seat back in the forwardly inclined state is set to the backwardly inclined state, the drum (2) also rotates in the direction B (counterclockwise) in FIG. 3 due to the backward rotation of the seat back. Since the rotating force of the drum (2) in the direction B acts in a direction to loosen the brake band (3) with respect to the drum (2), the frictional force of the brake band (3) against the drum (2) gradually decreases. Become. Accordingly, the seat back can be quickly moved from the forward leaning state to the backward leaning state as in the related art, without being greatly affected by the frictional force of the brake band (3).

When returning from the forward leaning state to the backward leaning state,
Initially, there is a frictional force of the brake band (3), and the seat back does not suddenly turn backward, so that the usability is extremely good when the occupant leans backward while sitting.

A friction material is interposed at the frictional portion between the brake band (3) and the drum (2) so that the frictional force can be effectively exerted, or the brake band (3)
It is preferred to coat the contact surface of the drum and the drum (2).

In the figure, (71) is a ratchet on the side of the upper arm (7) constituting a locking mechanism of the reclining device, (82) is a pole meshing with the ratchet (71), and (83) is a pole for the ratchet (71). (8
A release valley with an operation knob (83A) for engaging and disengaging 2) is urged by a spring (84) in a direction to engage the pawl (82) with the ratchet (71).

In the figure, reference numerals (81) and (81) denote bolts for fastening the housing (6) to the lower arm (8).
It is inserted into through holes (61) (61) provided in the housing (6) and fastened by fastening members. In the figure, (85) indicates the pivot (8).
9 shows a fastener for fixing the housing (6) fastened to the tip of 0) to the lower arm (8).

[0024]

According to the present invention, the structure in which the brake brake band is wound around the drum accommodating the return spring composed of the spiral spring allows the rearwardly inclined seat back to return to the forwardly inclined and upright state. The returning speed is fast at the beginning, and decreases as the vehicle leans forward and stands up, so that the returning speed of the seat back can be reduced.

Accordingly, since the friction area of the brake band with respect to the drum can be increased, the brake band is not worn even by long-term use, the frictional force is increased, and the damping property is improved.

In addition, by using a drum and a brake belt as a unit in advance, compactness can be achieved, and the unit can be easily and quickly assembled to a conventional return spring and locking pin, so that the assemblability can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded partial cutaway perspective view of the device of the present invention.

FIG. 2 is a sectional view of a main part.

FIG. 3 is an explanatory diagram showing the movement of a drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Return spring 2 Drum 3 Brake band 7 Upper arm 8 Lower arm

Claims (3)

[Claims] 1. A lower arm fixed to a seat cushion side and an upper arm fixed to a seat back side are pivotally attached to the front arm so as to be rotatable in the front-rear direction, and the seat back is tilted forward across the lower arm and the upper arm. In a reclining device provided with a return spring formed of a spiral spring biasing in a direction, a brake band is wound around a drum that rotates together with the upper arm and houses the return spring, and the brake band is One end thereof is fixed to the lower arm side, and the other end is urged in the drum tightening direction by the elastic force of a spring, so that the damping force for the forward rotation of the seat back is increased with respect to that of the rear. A reclining device, comprising: 2. The brake band is wound substantially U-shaped along the outer peripheral surface of the drum, and both ends thereof are inserted into bolts and one end is fixed to a lower arm-side mounting piece that is screwed to the bolt. 2. The reclining device according to claim 1, wherein the end is slidably inserted in the axial direction of the bolt, and is urged in a tightening direction of the brake band by a compression spring wound around the bolt. 3. One end of the return spring is hooked on a pivot for rotatably attaching the upper arm to the lower arm, and the other end is hooked on a locking pin provided on the upper arm. 2. The reclining device according to claim 1, wherein said pivots are respectively inserted into and attached to said engaging holes provided in the center of said drum.