JPH09267669A - Seat adjuster with walk-in mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of components in a seat adjuster with a walk-in mechanism. [Structure] A cam (3) which is indexed by a pull wire (4) and rotated by tilting a seat back forward is pivotally attached to the upper rail (2) side so as to be rotatable in the front-rear direction.
A pin (72) integral with a stopper (7) which is engaged with the locking teeth (11) (11) of the lower rail (1) and pivotally mounted in the vertical direction is inserted into a cam hole (32) provided in the It is characterized by

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat adjuster for adjusting the longitudinal position of a vehicle seat, and more particularly to a seat adjuster with a walk-in returning mechanism.

[0002]

2. Description of the Related Art A conventional seat adjuster of this type includes a slide lock mechanism for adjusting a front and rear position of a seat and a lock, and a lock releasing mechanism for releasing a lock of a slide lock mechanism in association with a forward movement of a seat back. And a memory mechanism for locking the seat at a predetermined position after the walk-in operation (for example, Japanese Patent Laid-Open No. 2-3101).
No. 32). The lock release mechanism and the memory mechanism are formed by assembling a large number of independent parts.

[0003]

Therefore, in the conventional seat adjuster with the walk-in mechanism, since the number of components is large, it not only takes a lot of time to assemble the seat adjuster,
There was a problem that required a mounting space. Therefore, an object of the present invention is to reduce the number of parts.

[0004]

In order to achieve the above object, a seat adjuster with a walk-in mechanism according to the present invention has a stopper pivotally attached to a seat-side upper rail so as to be vertically rotatable. In a seat adjuster in which a stopper is urged in an engaging direction of a locking tooth provided on a lower rail on a vehicle floor side, a pin provided integrally with the stopper and penetrating through a vertically elongated long hole provided on the upper rail side, The upper rail has a cam hole slidably mounted in the front-rear direction and through which the pin is inserted, and a cam which is indexed by a pull wire and pivots rearward when the seat back is tilted forward. A locking protrusion that abuts the front end surface of the lower rail is provided, and a protrusion that holds the locked state by the pin riding upward is provided at the lower hole edge of the cam hole. Be Te is characterized in.

When the cam is turned rearward by being indexed by the pull wire, the pin integrated with the stopper rides on the projection of the cam hole, and the stopper on the upper rail side comes out of the locking tooth of the lower rail and locks. When it is released, the unlocked state is maintained and the seat advances. Then, when the seat is moved backward, the projection of the cam abuts the front end surface of the lower rail, so that the pin returns to its original position due to its inertia, and the seat is locked at the neutral position.

[0006]

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. In the figure, (1) is a pair of left and right lower rails fixed to the vehicle floor side, and an upper rail (2) for fixing a seat is slidably fitted in the lower rails (1). A large number of locking teeth (11) (11) ... are integrally formed downward on the outer upper part of the lower rail (1).

On the other hand, a stopper (7) is pivotally attached to the upper rail (2) side by a pivot pin (73) so as to be rotatable in the vertical direction, and the stopper (7) is provided on the upper rail (2). Locking piece (7A) that engages with the locking teeth (11) (11) of the lower rail (1) through the window hole (23)
Is extended in an L shape, and a lock hole through which the locking teeth (11) and (11) are inserted is formed in the lock piece portion (7A).

The stoppers (7) provided on the left and right upper rails (2) are integrally connected to both free ends of the substantially U-shaped operation shaft (5) by connecting members (51), and the spring (6). The elastic force of (1) urges the lock piece portion (7A) in the direction in which it engages with the locking tooth (11), that is, in the lock direction. The spring (6) is a torsion bar, and one end of which is a hook hole (7B) provided on the rear side of the stopper (7).
, The other end has locking holes (2) provided in the upper rail (2).
2), respectively.

A bracket (71) is integrally welded to the front side of the stopper (7) in a U-shape.
The connecting member (51) is integrally fitted and fixed to 1). A pin (72) is fixed to the bracket (71) so as to pass through a vertically long slot (21) provided in the upper rail (2).

On the other hand, on the outer surface of the upper rail (2) corresponding to the pin (72), a cam (3) is pivotally attached by a stepped pin (30) such that an upper end portion thereof is rotatable in the front-rear direction.

As shown in FIGS. 2 and 3, the cam (3) is
A cam hole (32) through which the pin (72) is inserted is opened, and a front end face (1) of the lower rail (1) is formed at a lower end of the front side.
A locking protrusion (31) that abuts A) is extended downward.

Then, one end of the pull wire (4) is bonded to a mounting portion (33) provided at the rear lower end of the cam (3), and the other end of the pull wire (4) is connected to a reclining device. By pulling the seat back forward, the pull wire (4) is indexed to rotate the cam (3) backward.

Therefore, when the pin (72) is moved in the vertical direction, the stopper (7) is rotated in the vertical direction about the pivot pin (73), and when the rear side is rotated upward, As shown in FIG. 4, the lock piece portion (7A) engages with the locking teeth (11) (11) of the lower rail (1), and the upper rail (2) is locked to the lower rail (1).

Further, by rotating the rear side of the stopper (7) downward against the elastic force of the spring (6), the lock piece portion (7A) of the stopper (7) is moved as shown by the chain line in FIG. Escape from the locking teeth (11) (11) of the lower rail (1). As a result, the locked state of the upper rail (2) with respect to the lower rail (1) is released, and the upper rail (2) is slidable in the front-rear direction. When the locked state of the upper rail (2) with respect to the lower rail (1) is released, the return spring (not shown) advances.

The cam hole (32) formed in the cam (3) is shown in FIG.
As shown in FIG. 5, a protrusion (32A) that the pin (72) rides on to release the locked state is provided upward at the center of the lower hole edge in the front-rear direction.
The front hole edge with respect to A) is formed higher than the rear hole edge, that is, at a position closer to the rotation center of the cam (3), and the front hole edge is formed with the lock release holding portion (32C), The rear hole edge is used as the lock portion (32B). In the figure, (30A) shows an insertion hole for the stepped pin (30).

Therefore, when the stopper (7) is in the locked state, the pin (72) causes the lock portion (32) of the cam hole (32).
Located in B) by the elastic force of the spring (6), the cam (3)
When the pin (72) rides on the protrusion (32A) by the rotation of, the stopper (7) rotates and the locked state is released, and further, the lock (7) is attached to the lock release holding part (32C).
The lock release by the stopper (7) is held by moving 2).

Then, as shown in FIG. 6, the stopper (7)
The angle (R) between the force (W) applied in the normal direction to the center of the pin (72) and the edge of the lock release holding portion (32C) in the cam hole (32) from the center of rotation of the pin is less than 90 degrees. Then, the cam (3) is formed so as to work in the X direction.

Therefore, the cam (3), as shown in FIG.
As shown in FIG. 7, when the protrusion (31) is joined to the upper surface of the lower rail (1), the cam (3) moves in the X direction when the cam (3) is positioned in front of the lower rail (1) due to the forward movement of the seat. .

Thus, from the locked state of the upper rail (2) by the stopper (7) of FIGS. 2 to 4,
When the seat back is tilted forward, the pull wire (4) rotates the cam (3) backward. Therefore, the pin (72) located in the lock portion (32B) of the cam hole (32)
Rides on the protrusion (32A), the stopper (7) integral with the pin (72) is rotated to release the locked state.

Then, due to the elastic force of the return spring, as shown in FIG. 6, the projecting piece (31) of the cam (3) slides on the upper surface of the lower rail (1), and the seat advances to move the cam (3). As shown in FIG. 7, it is located in front of the front end face (1A) of the lower rail (1). Then, the cam (3) moves rearward and the pin (72) moves to the cam hole (3
It is located in the lock release holding part (32C) of 2). The lock release holding portion (32C) is the lock portion (32C).
Since it is located near the center of rotation of the cam provided on the upper end of the cam (3) with respect to B), the unlocked state by the stopper (7) is maintained.

Next, when the seat is retracted to its original position, the protruding piece portion (31) of the cam (3) abuts the front end surface (1A) of the lower rail (1). Therefore, due to the inertia at that time, the cam (3) rotates forward and rides on the upper surface of the lower rail (1). This causes the pin (72) to move into the cam hole (3
The stopper (7), which is always urged by the elastic force of the spring (6) in the locking direction to move to the lock portion (32B) of (2), engages with the locking teeth (11) and (11) of the lower rail (1). To meet. As a result, the upper rail (2) is locked to the lower rail (1) in the neutral position.

[0022]

According to the present invention, by rotating the cam indexed by the pull wire, the lock can be released and the seat can be locked at a predetermined position after the walk-in operation. Therefore, compared to the conventional slide adjuster with a walk-in mechanism having a lock release mechanism and a memory mechanism, the number of components is reduced, the assembly is easy, and the mounting space can be greatly reduced.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway front view of a main part.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of a cam.

FIG. 6 is an explanatory diagram showing a state of a cam when unlocking.

FIG. 7 is an explanatory diagram showing a cam in an unlocked and held state.

[Explanation of symbols]

 1 Lower rail 2 Upper rail 3 Cam 4 Pull wire 5 Lock release operation lever 7 Stopper 32 Cam hole 72 pin

Claims (3)

[Claims] 1. A seat adjuster in which a stopper is pivotally attached to a seat-side upper rail so as to be rotatable in a vertical direction, and the stopper is biased in an engaging direction of a locking tooth provided on a vehicle floor-side lower rail. A pin that is integrally provided with the stopper and that penetrates through a vertically long slot provided on the upper rail side, and a cam hole that is pivotally attached to the upper rail side so as to be slidable in the front-rear direction and into which the pin is inserted. A cam that is rotated backward by being indexed by the pull wire by tilting the seat back forward is provided at the lower end of the cam with a locking protrusion that abuts the front end surface of the lower rail, and at the lower hole edge of the cam hole. Is a seat adjuster with a walk-in mechanism, characterized in that it is provided with a protrusion for holding the locked state by the pin riding up. 2. The stopper engages with a locking tooth provided downward on the lower rail by rotating upward, and is biased in the direction of the locking tooth by the elastic force of a spring to integrally form an unlocking operation lever. The seat adjuster with a walk-in mechanism according to claim 1, wherein the seat adjuster is connected to the. 3. The seat adjuster with a walk-in mechanism according to claim 2, wherein the unlocking operation lever is bent in a substantially U-shape, and both free ends are connected to stoppers provided on the left and right upper rails.