JPH0719304Y2 - Car seat reclining mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a reclining mechanism for a vehicle seat.

(Prior Art) Conventionally, there are various automobile seats in which a cushion bracket fixed to a seat cushion and a back bracket fixed to a seat back are connected by a hinge shaft so that the seat back can recline with respect to the seat cushion. It has been put to practical use.

By the way, the back bracket is usually frictionally coupled to the cushion bracket and its rotational position is regulated. However, when a load such as back pressure or vibration of a seated person is applied to the seat back, the back bracket (seat back) is The rotation position is displaced.

(Problems to be solved by the invention) Therefore, in order to prevent this, conventionally, there is a brake spring provided, but there is a problem that it is necessary to complete the lock and it is expensive.

The present invention has been made to solve the above problem, and an object of the present invention is to provide a reclining mechanism capable of reliably preventing the rotational displacement of the back bracket with a simple structure.

Therefore, according to the present invention, a cushion bracket fixed to a seat cushion and a back bracket fixed to a seat back are connected by a hinge shaft, and the hinge shaft has external teeth. The gear is attached, the internal gear is fixed to the back bracket, the external gear is arranged eccentrically with the internal gear, and the external gear becomes a part of the internal gear due to the rotation of the hinge shaft. A reclining mechanism for an automobile seat, in which the back bracket rotates back and forth by rotating in an internal gear while meshing with the hand operation handle, which is connected to the hinge shaft via interlocking means. A sprocket is fixed to the operation handle, and a rotation stop spring having protrusions that engage with each other from two directions on the outer circumference of the sprocket is provided. The feature is that it is provided.

(Operation and effect of the invention) In the present invention, the rotation of the hinge shaft causes the external gear to mesh with a part of the internal gear that is eccentric to the external gear and to rotate in the internal gear to move the back bracket back and forth. In a reclining mechanism for a rotating automobile seat, a protrusion of a spring is engaged between two teeth of a sprocket of a manual operation handle from two directions of an outer periphery of a sprocket of a manual operation handle connected to a hinge shaft through interlocking means. The sprocket of the manual operation handle is prevented from rotating.

Therefore, even if the position of the external gear changes and the hinge shaft tries to rotate due to changes in back pressure or vibration applied to the seat back from a seated person who is seated on the vehicle seat by accelerator operation or brake operation, the interlocking means can be used. Since the two protrusions of the spring engage with the sprocket on the side of the manual operation handle that interlocks with the hinge shaft from two directions on the outer periphery of the sprocket, the rotation of the sprocket is regulated, so that the back bracket rotation position is reliably prevented In addition, the back bracket can be easily rotated from the hand operation handle side.

Further, basically, since it is sufficient to provide a sprocket and a spring, the structure is simple and the cost can be reduced.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, a reclining mechanism for an automobile seat connects a cushion bracket 1 fixed to a seat cushion, a back bracket 2 fixed to a seat back, and both brackets 1 and 2. The hinge bracket 3 is basically configured so that the back bracket (seat back) 2 can recline (rotate back and forth) with respect to the cushion bracket (seat cushion) 1.

An internal gear 4 is fixed to the back bracket 2 and an external gear 5 is fixed to the hinge shaft 3, so that these gears 4 and 5 are eccentric.

Then, when the external gear 5 is rotated by the hinge shaft 3, the internal gear 4 partly meshing with the external gear 5 is rotated, and the internal bracket 4 causes the back bracket 2 to rotate back and forth (fine adjustment). ) Will be done.

Although a detailed description is omitted, there is provided a coarse adjustment mechanism capable of rotating the back bracket 2 back and forth every 15 degrees when the lock is released by operating the lever 6.

A balance spring 7 is wound around the hinge shaft 3 while a large-diameter chain sprocket 8 is fixed.

On the other hand, a support shaft 9 is erected at the front end of the cushion bracket 1, and the support shaft 9 has a small diameter chase sprocket.
A sprocket handle 11 integrally formed with 10 is rotatably fitted.

A chain 12 is stretched between the chain sprocket 10 and the chain sprocket 8 of the hinge shaft.

A reclining handle 13 for manual operation is attached to the sprocket handle 11.

A sprocket 14 made of synthetic resin is fixed to the sprocket handle 11 (see FIG. 4).

In the vicinity of the sprocket 14 of the cushion bracket 1, a detent spring 15 having protrusions 15a, 15a engaging between the teeth of the sprocket 14 is fixed with screws 16.

With the above configuration, the reclining handle 13
When is manually rotated, the hinge shaft 3 is rotated through the chain sprocket 10, chain 12, and chain sprocket 8, and the external gear 5 is rotated by the hinge shaft 3,
The external gear 5 rotates the internal gear 4, and the back bracket 2 is rotated back and forth.

On the other hand, when a load is applied to the back bracket 2 from the seat back due to the back pressure of the seated person, the internal gear 4 → the external gear 5 →
The chain sprocket 18 → chain 12 → chain sprocket 10 rotates in that order, and the back bracket 2 tries to shift its rotational position, but the sprocket 14 fixed to the sprocket handle 11 integrated with the chain sprocket 10
Since the projections 15a, 15a of the anti-rotation spring 15 are engaged between the teeth of the, the sprocket 14 is prevented from rotating, and the chain sprocket 10 also does not rotate.

Therefore, since the chain 12 → the chain sprocket 18 → the external gear 5 → the internal gear 4 does not rotate, the back bracket 2 also does not rotate and the rotational position does not shift.

When the reclining handle 13 is rotated manually, the spring engaged between the teeth of the sprocket 14 is
Since the protrusions 15a, 15a of 15 function like an apex click, the rotation operation of the reclining handle 13 is not hindered.

[Brief description of drawings]

FIG. 1 is a front view of a reclining mechanism according to the present invention, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a bottom view of FIG. 1, and FIG. 4 is a front view of a sprocket and a detent spring. is there. 1 …… Cushion bracket, 2 …… Back bracket, 3 …… Hinge shaft, 8,10 …… Chain sprocket,
11 …… Sprocket handle, 12 …… Chain, 13 ……
Reclining handle, 14 …… sprocket, 15 ……
Anti-rotation spring.

Claims (1)

[Scope of utility model registration request] 1. A cushion bracket fixed to a seat cushion and a back bracket fixed to a seat back are connected by a hinge shaft, and an external gear is attached to the hinge shaft. The internal gear is fixed, the external gear is arranged eccentrically with the internal gear, and the rotation of the hinge shaft causes the external gear to rotate in the internal gear while meshing with a part of the internal gear. In a reclining mechanism for a vehicle seat in which the back bracket rotates forward and backward, a hand operation handle connected to the hinge shaft via interlocking means is provided, and a sprocket is fixed to the hand operation handle. 2 on the outer circumference of the sprocket
A reclining mechanism for an automobile seat, characterized in that a rotation stop spring having protrusions that engage with each other in the direction from the direction is provided.