JPH0518992Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a seat reclining device for a vehicle or the like.

<Prior Art> A general mechanism of a seat reclining device for adjusting the inclination angle of the backrest of a seat in an automobile, etc., as shown in Fig. 4, includes a lower arm 1 fixed to the seat side of the seat and a backrest of the seat. The upper arm 2 fixed to the side is connected by a pivot 3, the inner end of a spiral spring 4 is engaged with the pivot 3, the outer end is engaged with the upper arm 2, and a turning force in the forward tilting direction is applied to the backrest. The reclining lever 5 locks and unlocks the longitudinal tilt adjustment position of the upper arm 2.

<Problem to be solved by the invention> The reclining lever 2 is biased with a turning force in the locking direction by a return spring 6.
As shown in FIG. 4, the return spring 6 is stretched in a straight line between the reclining lever 2 and the lower edge of the lower arm 1. In order to secure the installation height and stroke allowance of the return spring 6, there are major restrictions on the external shape of the lower arm 1, and along with this, the height a1 (the height a1 of the position of the pivot shaft 3 from the lower side of the lower arm 1) Figure 4) is raised. Increasing the height a1 of this pivot 3 increases the height of the connecting rod that passes over the center line of the pivot 3 in order to interlock the left and right recliners. There were problems with the riding comfort due to the feeling of a foreign body in the pelvic part of the backrest and insufficient sway.

<Means for Solving the Problems> The present invention was provided in order to solve the above-mentioned conventional problems, and this configuration connects the lower arm and the upper arm with a pivot, and adjusts the mutual angle of the lower arm and the upper arm. In the seat reclining mechanism, a first spiral spring that pivots and biases the upper arm in a forward tilting direction and a second spiral spring that pivots and biases the reclining lever in a locking direction are provided in parallel on the pivot shaft. be.

<Function> With the above-mentioned configuration, the lower edge of the lower arm can be shaped as close as possible to the pivot side, which results in the pivot being able to be positioned at a lower position, thereby lowering the connecting rod position and resolving the conventional problem of ride comfort.

<Embodiments> Hereinafter, embodiments of the present invention will be described with reference to the drawings. In Fig. 1, 1 is a lower arm, 2 is an upper arm, 3 is a pivot, and 4 is a spiral spring for biasing the upper arm 2 to tilt forward, which will be referred to as the first spiral spring for the sake of convenience. 5 is a reclining lever, which operates a pawl 11 that engages with a ratchet 10 fixed to the upper arm 2 side, and disengages the engagement. Normally, the pawl 1 is pulled by the force of a spring.
1 is biased in a direction to engage with the first gear 1.

In the present invention, the spring mechanism for biasing the reclining lever 5 to turn is configured as follows. That is, as shown in FIGS. 2 and 3 B and C, in addition to the first spiral spring 4 for tilting the upper arm 2 forward, there is a second spiral spring 4 on the pivot 3 connecting the lower arm 1 and the upper arm 2. Springs 9 are provided in parallel, and the outer end of the second spiral spring 9 is engaged with the reclining lever 5 to swivel the reclining lever 5 in the direction in which the upper arm 2 is locked, that is, in the direction in which the pawl 11 engages with the ratchet 10. It is something that has been strengthened.

The second spiral spring 9 corresponds to the conventional coil-shaped return spring 6, and does not require a strong spring force like the first spiral spring 4, so as shown in FIGS. 3B and 3C. A spiral spring made of rope is sufficient, and the installation space is small.

Since the present invention has the structure as described above, the return spring of the reclining lever 5 is connected to the pivot 3.
Since the second spiral spring 9 is provided above, the lower side of the lower arm 1 can be shortened by the dimension b compared to the conventional case, as shown in FIGS. 1 and 3.

As a result, the height a1 from the lower side of the lower arm 1 to the pivot shaft 3 is lowered by a1-b, and the pivot shaft 3 is lowered. As a result, the position of the connecting rod, which is placed on the axis of the pivot 3 and passes through the lower part of the backrest, can be placed at a low position corresponding to the above-mentioned dimension b. This eliminates the problem and improves ride comfort.

In addition, by providing a second spiral spring 9 for returning the reclining lever 5 on the pivot shaft 3,
As shown in FIGS. 3B and 3C, the ratchet 10 and the pawl 11 can be positioned on either the right or left side of the lower arm 1, as required.

<Effects of the invention> As described above, according to the invention, a spiral spring is provided as a return spring of the reclining lever on the axis connecting the lower arm and the upper arm in parallel with the spiral spring for forward tilting of the upper arm. Therefore, the lower side of the lower arm can be shortened toward the axis, and as a result, the height from the lower side of the lower arm to the axis can be made as low as possible. The position of the connecting rod that passes through the lower end can be lowered, which eliminates the feeling of a foreign body in the pelvic part of the backrest and lack of deflection due to the connecting rod, and has the advantage of improving riding comfort. ing.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the present invention, Fig. 2 is a perspective view of the main parts, Fig. 3 is a sectional view to explain the characteristics of the present invention compared to the conventional one, and Fig. 4 is a perspective view of the conventional device. be. 1...Lower arm, 2...Atsupa arm, 3...
... Pivot, 4... First spiral spring, 5... Reclining lever, 9... Second spiral spring.

Claims (1)

[Scope of utility model registration request] Connect the lower arm and atsupa arm with a pivot,
In the seat reclining mechanism in which the mutual angle between the lower arm and the upper arm can be adjusted, a first spiral spring that pivots and biases the upper arm in a forward tilting direction and a second spiral spring that pivots and biases the reclining lever in a locking direction are disposed on the pivot axis. A seat reclining device characterized by being provided in parallel.