JPH0357761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat back adjustment device for changing the inclination angle of a seat back of a front seat of an automobile, particularly a passenger car.

Many adjustment devices of this type have been proposed, but all of the conventional devices have a basic configuration of using some kind of gear in the driven part and adjusting the inclination angle of the seat back by changing the meshing position of the gear. There is. For this reason, it has not been possible to completely solve the problems of poor workability, difficulty in achieving precision, and high cost since the gear is difficult to work with.

The present invention was made for the purpose of providing a device that can adjust the angle of the seatback without using gears. and an angle adjustment handle rotatably supported separately, an eccentric disk part or an eccentric circular hole part is formed at an eccentric position of the angle adjustment handle, and this is formed at one end of the interlocking arm. The angle adjustment handle can be rotated by providing an interlocking pin that is rotatably fitted into the hole or the driven disc section and fitted into the motion transmission groove below the rotation center of the above-mentioned Atsuppa arm at the other end of this interlocking arm. The feature is that the motion is converted into the tilting motion of the Atsupa arm.

The present invention will be described below with reference to illustrated embodiments. The lower bracket 11 is fixed to the side of a cushion seat (not shown) in the front seat of a passenger car.
Further, a rotation center hole 15 for the angle adjustment handle 14 is provided diagonally below and in front of this hole 13. The rotation center hole 13 has a non-circular cross section, for example, an oval shape as shown, and the end of the hinge pin 26 is fitted therein in a non-rotatable manner. The angle adjustment handle 14 is formed by embossing a rotation protrusion 16 that rotatably fits into the rotation center hole 15 on a disk-like plate body, and furthermore, there is a rotation protrusion 16 in the rotation protrusion 16 that is eccentric to the rotation protrusion 16. An eccentric circular hole 17 is embossed at the position shown in FIG. The rotation center hole 18 of this angle adjustment handle 14
Of course, the angle adjustment handle 14 is concentric with the rotation protrusion 16, and a handle 19 for operation is provided protruding from the angle adjustment handle 14.

Inside this eccentric circular hole portion 17 is a driven disk portion 21 which is similarly embossed on one end of the interlocking arm 20.
is rotatably fitted. A large-diameter play hole 22 whose center position coincides with the rotation center hole 18 is bored at an eccentric position in the driven disc portion 21, and the play hole 22 and the rotation center hole 18 are expanded. A support shaft 23 having a diameter head is inserted into the lower bracket 1.
The angle adjustment handle 14 and the interlocking arm 20 are coupled with each other by sandwiching the angle adjustment handle 14 and the interlocking arm 20. The play hole 22 does not hinder the movement of the driven disk portion 21 when the angle adjustment handle 14 is rotated through the eccentric circular hole portion 17 . The other end of this interlocking arm 20 has an interlocking pin 2.
4 is fixed.

The upper arm 12 is fixed to the side surface of a seat bag (not shown), and its lower part is connected to the lower bracket 11 by means of a hinge pin 26 inserted non-rotatably into the rotation center hole 25 and the rotation center hole 13. It is pivoted. A spiral spring 28 is installed in the diametrical groove 26a of the hinge pin 26.
The inner end of the spiral spring 28 is supported, and the outer end of the spiral spring 28 is hooked onto a spring hook 12a cut out from the upper arm 12 to urge the upper arm 12 to fall forward. On the periphery of the lower end of this Atsupah arm 12, three stages of motion transmission grooves 29, 30, 31 are arranged at different positions in the circumferential direction.
An interlocking pin 24 fixed to the other end of the interlocking arm 20 fits into this movement transmission groove 29, 30 or 31.

The coarse adjustment handle 32 is pivotally connected to the hinge pin 26 through its rotation center hole 33. This coarse adjustment handle 32 moves the interlocking pin 24 forward and backward into the motion transmission groove 30 or 31, and has a cam groove 34 into which the interlocking pin 24 is fitted. This cam groove 34 allows the interlocking pin 24 to fit into the motion transmission groove 30 or 31 when the coarse adjustment handle 32 is rotated in the locking direction (counterclockwise in FIG. When rotated in this direction, the interlocking pin 24 is released from the locking position, and is normally biased by a tension spring 35 to rotate in the direction in which the interlocking pin 24 is inserted, that is, in the locking direction.

This device having the above configuration operates as follows. First, if the interlocking pin 24 is located in the center movement transmission groove 30 as shown in FIG. in an inclined motion position (so-called neutral position). In this state, operate handle 1
When the angle adjustment handle 14 is rotated by 9,
An eccentric circular hole 1 is located at the eccentric position of the angle adjustment handle 14.
7, and this eccentric circular hole 17 is the interlocking arm 20.
Since the interlocking arm 20 is fitted with the driven disc portion 21 at one end, the interlocking arm 20 moves back and forth in its longitudinal direction as the eccentric circular hole portion 17 moves. Then, the interlocking pin 24 at the other end of the interlocking arm 20 moves into the motion transmission groove 3.
0, the lower end of the upper arm 12 is pushed forward or backward, and as a result, the upper arm 12 rotates around the hinge pin 26, changing its angle of inclination with respect to the lower bracket 11. In other words, the inclination angle of the upper arm 12 is finely adjusted. With respect to the force applied to the Atsupa arm 12, it is possible to suppress the rotational force applied from the driving transmission groove 30 to the interlocking pin 24, and further from the interlocking arm 20 to the angle adjustment handle 14 via the disk portion 21, to a small extent. There is no risk that 12 will fall down carelessly.

When folding the Atsupah arm 12, use the operation handle 3.
6 to rotate the coarse adjustment handle 32 in the unlocking direction. Then, the interlocking pin 24 separates from the motion transmission groove 30 due to the action of the cam groove 34, so that there is no force that prevents the rotation of the upper arm 12, and the upper arm 12 can freely rotate around the hinge pin 26. Then, when the operating handle 36 is released after tilting forward or backward an appropriate amount, the coarse adjustment handle 32 is rotated in the locking direction by the force of the tension spring 35, and at the same time, the interlocking pin 24 enters the motion transmission groove 29 or 31. The upper arm 12 is held in the forward position or the rearward position, and the same fine adjustment as described above can be made by rotating the angle adjustment handle 14 in the tilted position.

In this embodiment, there are only three movement transmission grooves formed in the upper arm 12, indicated by numerals 29, 30, and 31, but it is obvious that these can be increased or decreased as appropriate. The case where the upper arm 12 is reduced is a case where there is no need to tilt the upper arm 12, and therefore, it is sufficient to provide one movement transmission groove 30 in the upper arm 12. Such an example can be considered, for example, when the present invention is applied to a truck seat, in which case the coarse adjustment handle 32 is not required.

In addition, lower bracket 11 and angle adjustment handle 1
4, the angle adjustment handle 14 is adjusted by vibration.
In order to prevent the upper arm 12 from changing the inclination angle due to rotation, a multi-stage rotation prevention notch 37 is formed around the rotation center hole 15, and the angle adjustment handle 14 has this rotation prevention notch. It is preferable to provide a detent projection 38 that resiliently fits into 37. In addition, suitable friction increasing means may be provided. Furthermore, in the above embodiment, the eccentric circular hole part 17 was provided on the angle adjustment handle 14 side, and the driven disc part 21 that was fitted into the eccentric circular hole part 17 was provided on the interlocking arm 20 side. It is clear that a circular plate portion may be provided on the 14 side and a circular hole portion into which the disk portion is inserted on the interlocking arm 20 side.

As described above, the seat back adjustment device of the present invention rotatably supports the upper arm and the angle adjustment handle on different axes on the lower bracket, and the eccentric circular hole portion or the angle adjustment handle is provided at the eccentric position of the angle adjustment handle. A driven disk portion or a driven circular hole portion of the interlocking arm is rotatably fitted into the eccentric disk portion, and the interlocking arm is moved forward and backward by rotating the angle adjustment handle.
Since the movement of this interlocking arm is transmitted to the upper arm via the motion transmission groove to change the angle of the upper arm, the inclination angle of the seat back can be adjusted steplessly without the need for a gear mechanism. . Therefore, it is possible to obtain an inexpensive and reliable seatback adjustment device that reliably solves problems such as difficulty in processing, difficulty in maintaining accuracy, and increased cost associated with gear processing.

Furthermore, in the present invention, since the angle adjustment handle and the coarse adjustment handle are pivoted by separate shafts, the rotational operation of one handle does not affect the other handle, and moreover, the interlocking pin is located in the cam groove. can be freely moved in the direction of fine adjustment, so even if the angle adjustment handle is rotated, the coarse adjustment handle will remain in a fixed position, and even if force is applied to the coarse adjustment handle in a direction other than the unlocking direction, Since the cam groove moves without restricting the interlocking pin, the fine adjustment angle of the Atsupa arm frame does not change.

[Brief explanation of drawings]

The figures show an embodiment of the seat back adjustment device according to the present invention, in which Fig. 1 is a side view of the main parts, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is an exploded view of the main parts. The perspective view and FIG. 4 are developed cross-sectional views taken along the - line in FIG. 3. 11...Lower bracket, 12...Upper arm, 14...Angle adjustment handle, 17...Eccentric circular hole part, 20...Interlocking arm, 21...Driven disc part, 24...Interlocking pin, 26...Hinge pin ,2
8...Spiral spring, 29, 30, 31
...Motion transmission groove, 32...Rough adjustment handle, 35
...Tension spring.

Claims (1)

[Scope of Claims] 1. A lower bracket fixed to the side surface of the cushion seat supports the lower part of the upper arm fixed to the side surface of the seat bag and a rough adjustment handle so as to be able to rotate independently, and the angle can be adjusted. A handle is rotatably supported on an axis separate from the above-mentioned atupa arm and coarse adjustment handle, an eccentric disk part or an eccentric circular hole part eccentric from the center of rotation is formed in the angle adjustment handle, and one end of the interlocking arm is formed. A driven circular hole part or a driven disc part is formed in the part, and the driven circular hole part or driven disc part is rotatably fitted into the eccentric disc part or the eccentric circular hole part, and the other end of the interlocking arm is fitted into the motion transmission groove of the above-mentioned upper arm. An interlocking pin is provided on the coarse adjustment handle, and when the angle adjustment handle rotates, the interlocking pin is allowed to move as the interlocking arm moves in the coarse adjustment direction;
A seatback adjustment device for an automobile, characterized in that a cam groove into which the interlocking pin fits is formed to move the interlocking pin in a direction away from the interlocking transmission groove when the coarse adjustment handle is rotated in the unlocking direction. .