JPH0810080A - Seat reclining device - Google Patents

Abstract

PURPOSE:To form a stopper as a member of a seat reclining device for regulat ing the angle of turning of an upper arm in relation to a lower arm without increasing dimension of both the arms. CONSTITUTION:Recessed parts 5, 14 are provided in an upper arm 4 and a lower arm 2 so as to be opposite to each other, and a pole 16 and a cam member 18 are arranged in the recessed part 5 of the lower arm 2 so that a part of the side surface of the pole 16 in the thick direction can abut on the side surface 29 of the recessed part 14 of the upper arm 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat reclining device in which a seat back side upper arm is rotatable with respect to a seat cushion side lower arm.

[0002]

2. Description of the Related Art A seat reclining device has a fairness of 5
As disclosed in Japanese Laid-Open Patent Publication No. 20193, a seat cushion side lower arm supports an upper arm via a rotation shaft, and a mechanism for locking both arms as a seat back angle adjusting mechanism and a mechanism for releasing the lock are interposed between both arms. It has a basic configuration that allows As the mechanism, the above-mentioned publication shows a planetary gear type reduction gear, but apart from this, a combination of a pole and a ratchet or the like may be used. In either case, a stopper is required to regulate the maximum forward tilt angle and the maximum backward tilt angle of the seat back with respect to the seat cushion.

In the stopper disclosed in the above-mentioned publication, the convex portion of the upper arm is fitted into the circular arc groove of the bracket on the lower arm side, and the convex portion is brought into contact with the side end surface of the groove to thereby rotate the upper arm with respect to the lower arm. regulate. The center of the arc groove coincides with the axis of the rotating shaft, and the groove is provided within an angle of about 180 degrees. In the example of U.S. Pat. No. 4,087,885, the lower protrusion of the upper arm is opposed to the lower arm pin and the lower arm protrusion is opposed to the upper arm pin, and the protrusion is responsive to the inclination of the upper arm. Alternatively, the pin is brought into contact with the pin or the protruding piece of the lower arm to regulate the rotation amount of the upper arm.

[0004]

In the example of the Japanese publication mentioned above, the dimension between the circular arc groove and the rotation axis is small, the force acting on the groove side end and the convex portion is large, and some reinforcement is required. desirable. The above-mentioned U.S. patent specification requires a protruding piece on the side edges of both arms and a pin for receiving the protruding pieces, so that the shapes of both arms must be large. This results in a loss of cabin space. Therefore, it is an object of the present invention to solve the above-mentioned problems of the conventional technology.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, basically, a side surface of a pole slidable in a radial direction of a rotary shaft in a recess of a lower arm is provided with a recess of the upper arm. Can freely contact the side surface.

Specifically, according to the present invention, a lower arm fixed to a seat cushion, an upper arm fixed to a seat back, a rotary shaft penetrating both arms and supporting an operation lever, and provided on both arms. A cam member located in the recess and supported in a non-rotational relationship with the rotating shaft, and a pin having teeth that can be engaged with and disengaged from the teeth of the ratchet portion of the recess of the upper arm and that passes through the cam slot formed in the operation lever. A seat reclining device, characterized in that a part of a side surface in a thickness direction of the poles in the recesses of both arms faces a side surface of the recess of the upper arm.

[0007] Preferably, the pole is movable in the recess of the lower arm in a direction toward or away from the rotation axis, and a part of the side surface of the recess of the upper arm serves as an escape portion with respect to the side surface of the pole.

[0008]

When the operating handle is rotated in the clockwise direction (see FIG. 2), the cam member rotates together with the operating handle and the pole moves in the rotation axis direction by the pin guided by the elongated hole of the operating handle, and the pole of the pole is moved. The tooth and the tooth of the ratchet part are separated. When the upper arm is tilted back and forth in this state, the side surface of the pole comes into contact with the side surface of the concave portion of the upper arm, and the rotation angle of the upper arm is restricted. The position of the upper arm is
You can choose arbitrarily within this regulated angle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat reclining device 1 for a seat mounted on a vehicle includes a lower arm 2 fixed to a seat cushion (not shown) and a seat back which is rotatably supported by a lower arm 2 via a rotary shaft 3. (Not shown)
And an upper arm 4 fixed to. Lower arm 2
Is provided with an arcuate convex portion 6 projecting from the mating surfaces of both arms 2 and 4, and a concave concave portion 5 in the opposite direction.
The recess 5 has a rectangular portion 7 and a semicircular portion 8 as shown in FIG.
The semi-circular portion 8 has a cam surface 10 ′ centered on the hole 9 for the rotary shaft 3. The convex portion 6 forms an arc concentric with the center of the hole 9. The upper arm 4 is provided with a recess 14 that faces the recess 5 of the lower arm. As shown in FIG. 1, the concave portion 14 is composed of a fan-shaped portion 11 and a semicircular portion 12, and the semicircular portion 12 is formed with an arcuate concave portion 10 for receiving the convex portion of the lower arm 2. The center of the recess 10 is concentric with the center of the hole 13 for the rotary shaft 3.

The arcuate convex portion 6 of the lower arm 2 is slidably fitted between the arcuate concave portion 10 of the upper arm 4 and the semi-blanked wall at the upper part of the semicircular portion 12, whereby both arms 2,
It serves as a guide for relative rotation between the four and a bearing function. A half punched ratchet portion 15 is provided below the fan-shaped portion 11 of the recess 14 of the upper arm 4. The pole 16 is slidably arranged in the rectangular portion 7 of the recess 5 of the lower arm 2. Fix the pin 17 to the pole 16 and attach the pin 17 to the hole 18 'of the lower arm 2.
Extend laterally through. The teeth of the pole 16 are disengageable from the teeth of the ratchet portion 15. The cam member 18 is arranged in the semicircular portion 8 of the recess 5. The cam member 18 is in contact with the cam surface 19 of the pole 16 and the cam surface 20 of the semi-circular portion 8.
It has a cam surface 21 that is in sliding contact with 0 ', is coupled to the rotary shaft 3 through a two-sided width, and follows the rotation of the rotary shaft 3. As is apparent from FIG. 4, the pole 16 and the cam member 18 are
About half of it is located in the recess 14 of the upper arm 4.

The rotating shaft 3 penetrating the holes 9 and 13 of both arms 2 and 4 and the cam member 18 supports the bracket 23 with the facing projections 22 and 22 and the operating lever 24. The operating lever 24 is fixed to the rotary shaft 3 via the width across flats. One end of the spiral spring 25 for always inclining the seat back forward is locked to a pin 26 fixed to the upper arm 4, and the other end is locked to one protrusion 22 of the bracket 23. The pin 17 is inserted into the cam slot 27 of the operating lever 24.

Reference numeral 28 denotes a spring which holds the operating lever 24 at the position shown in FIG. 2 at all times. The spring 28 is locked to the operating lever 24 and the bracket 23. Spring 2
8 enters the protrusions 22, 22 of the bracket 23 and is protected by the protrusions 22, 22.

Approximately half the thickness of the pole 16 housed in the recess 5 of the lower arm 2 enters into the recess 14 of the upper arm 4, and both side surfaces thereof face the side surface 29 of the fan-shaped portion 11 of the recess 14 and the When the rotation angle with respect to the lower arm 2 is about to exceed the specified value, the side surface of the pole 16 comes into contact with the side surface 29 of the fan-shaped portion 11 to restrict the rotation angle of the upper arm 2.

In the state shown in FIG. 2, when the operation lever 24 is rotated clockwise about the rotary shaft 3 against the urging force of the spring 28, the rotary shaft 3 in a fixed relationship with the operation lever 24 rotates. The cam member 18 rotates. Therefore, the cam surfaces 20 and 21 of the cam member 18 are
By changing the sliding contact relationship with 10 ', the pole 16 can be moved in the direction of the rotation axis 3. On the other hand, the rotation of the operation lever 24
Since the pin 17 is moved in the radial direction along the long hole 27,
The pole 16 integrated with the pin 17 moves in the rotation axis direction. As a result, the teeth of the pole 16 and the teeth of the ratchet portion 15 are disengaged, the locking relationship of the upper arm 4 with the lower arm 2 is released, and the upper arm 4 can be tilted forward by the urging force of the spiral spring 25. It becomes possible to lean backwards by the power of the occupant against the. That is, the seat back (not shown) can be selected at a desired position. The maximum forward and backward tilt of the upper arm 4 is restricted by contacting the side surface 29 of the recess 14 of the upper arm 4 on the side surface of the pole 16.

After the upper arm 4, that is, the seat back is moved to a desired position, the operation lever 24 is returned to its original position, and the pin 17 is guided by the elongated hole 27 to return the pole 16 to the ratchet portion 15 direction. Since the cam member 18 is rotated, the teeth of the pole 16 and the teeth of the ratchet portion 15 are again engaged with each other, and the arms 2 and 4 are returned to the positions shown in FIG. Thus, both arms 2, 4
Are locked in a new position.

In order to reduce the contact surface between the side surface of the pole 16 and the side surface 29 of the recess 14 of the upper arm 4, it is advisable to form an escape portion 29 'on the side surface 29 as shown in FIG. In this case, the side surface of the pole and the side surface 2 of the recess 14 of the upper arm 4
The contact surface with 9 is restricted, and the rotation angle can be set accurately.

[0017]

According to the present invention, the contact position between a part of the side surface of the pole in the thickness direction and the side surface of the recess of the upper arm can be set at a position separated from the rotation axis, so that the load on the contact position can be reduced. You can Further, it would be advantageous in terms of strength if the bearing portions of both arms are provided on the opposite side of the contact position from the rotation axis. Further, the relief portion of the concave portion of the upper arm can limit the contact surface and regulate the rotation angle of the upper arm with high accuracy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a seat reclining device according to an example of the present invention.

FIG. 2 is a front view of an example of the present invention in an assembled state.

FIG. 3 is a front view of another example of the present invention in an assembled state.

FIG. 4 is a sectional view taken along the line AA in FIG.

[Explanation of symbols]

 2 Lower arm 3 Rotating shaft 4 Upper arm 5, 14 Recessed part 15 Ratchet part 16 Pole 17 Pin 18 Cam member 22 Projection piece 23 Bracket 24 Operating lever 25 Spiral spring 27 Cam long hole 28 Spring 29 Contact side surface

Claims (2)

[Claims] 1. A lower arm fixed to a seat cushion, an upper arm fixed to a seat back, a rotary shaft penetrating both arms and supporting an operating lever, and a rotary shaft positioned in a recess provided in both arms. A cam member supported by a shaft in a non-rotational relationship; and a pole having teeth that can be engaged with and disengaged from the teeth of the ratchet portion of the recess of the upper arm, and a pin that has a pin that passes through a cam slot formed in the operation lever. A seat reclining device, wherein a part of a side surface of the pole in the recess of the arm in the thickness direction faces a side surface of the recess of the upper arm. 2. The pole is movable in the recess of the lower arm in a direction toward or away from the rotary shaft, and a part of a side surface of the recess of the upper arm serves as a relief portion with respect to a side surface of the pole. Seat reclining device.