JPH0349562B2 - - 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 a device that can adjust the angle of the seat back without using gears, and includes a lower bracket fixed to the side of the cushion seat; and a lower bracket rotatably supported by the lower bracket. an upper arm fixed to a side surface of the seat back; and a rotatable angle adjustment handle for adjusting the angle of the seat back. a circular rotation protrusion rotatably fitted into the rotation center hole of the angle adjustment handle; an eccentric disk portion or an eccentric circular hole portion located at a position eccentric from the rotation center of the circular rotation protrusion; is provided by embossing molding, and a driven circular hole portion or a driven disc portion rotatably fitted into the eccentric disk portion or eccentric circular hole portion is provided at the lower end of the atupa arm by embossing molding, and the angle of the atupa arm is The present invention is characterized in that the center of rotation during fine adjustment is provided at a position away from the driven circular hole portion or the driven disc portion.

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, and a rotation center hole 1 for the angle adjustment handle 12 is located above the rear part of the lower bracket 11.
3, and rotation fulcrum grooves 14 and 15 are formed in the upper and rear portions of the lower bracket 11, respectively, and are oriented substantially in the radial direction of the rotation center hole 13.

The angle adjustment handle 12 is formed by press-working a disc-like plate body with a rotation protrusion 16 that rotatably fits into the rotation center hole 13, and further includes a rotation protrusion 16 inside the rotation protrusion 16. It is formed by embossing an eccentric circular hole 17 at an eccentric position. The rotation center hole 18 of the angle adjustment handle 12 is of course concentric with the rotation protrusion 16, and the angle adjustment handle 12 is provided with a protruding handle 19 for operation.

The upper arm 20, which is fixed to the side surface of a seat bag (not shown), has a driven disc part 21 embossed at its lower end, which is rotatably fitted into the eccentric hole part 17. A large-diameter play hole 22 whose center position coincides with the rotation center hole 18 is bored in the driven disc portion 21, and a release arm 23 is formed in the driven disc portion 21.
A support shaft 24 that coaxially supports the rotation center hole 22 and the rotation center hole 18 is inserted through the play hole 22 and the rotation center hole 18. Also, this atsupah arm 20 is attached to the support lever 2 of the rotation center pin 25.
8 rotation center hole 26 and a moving elongated hole 27 that allows the rotation center pin 25 to move forward and backward into the rotation fulcrum groove 14 or 15.

The rotation center pin 25 is fixed to one end of the support lever 28, and the other end of the support lever 28 is pivotally connected to the rotation center hole 26 by a pin 29. Further, a detachment cam hole 30 for the rotation center pin 25 is bored in the release arm 23, and the rotation center pin 25 is inserted into the detachment cam hole 30 and the movement elongated hole 27, and is inserted into the rotation fulcrum groove. 14 or 15, and is located above the driven disk portion 21.

31 is a tension spring tensioned between the spring hook 32 of the release arm 23 and the rotation center pin 25;
The rotation center pin 25 and the release arm 23 are urged in a direction in which the rotation center pin 25 fits into the rotation fulcrum groove 14 or 15. Note that 33 is a spacer ring inserted between the driven disk portion 21 of the upper arm 20 and the rotation center hole 34 of the release arm 23, and 35 is an operating lever of the release arm 23.

This device having the above configuration operates as follows. First, the rotation center pin 25 is inserted into the rotation fulcrum groove 1 as shown in FIG.
At this time, the upper arm 20, that is, the seat back, is in an operating position (a so-called neutral position) in which the upper arm 20, that is, the seat back, is slightly tilted rearward from the position perpendicular to the lower bracket 11, that is, the cushion seat. In this state, operate handle 1
When the angle adjustment handle 12 is rotated by 9,
An eccentric circular hole 1 is located at the eccentric position of the angle adjustment handle 12.
7, and this eccentric circular hole part 17 is the atsupa arm 2.
0, the lower end of the upper arm 20 moves relative to the support shaft 24. At this time, the center of rotation of the upper arm 20 is the rotation center pin 25 fitted in the rotation fulcrum groove 14, so that the upper arm 20 changes its inclination angle with respect to the lower bracket 11. In other words, the inclination angle of the upper arm 20 is adjusted. Atsupa arm 20
Since it is possible to suppress the rotational force applied to the angle adjustment handle 12 via the driven disc portion 21 to a small level, there is no risk that the upper arm 20 will fall down inadvertently.

When the upper arm 20 is to be tilted down, the release arm 23 is rotated counterclockwise in FIG. A support lever 28 that can swing around a moving elongated hole 27 formed in the Atsupah arm 20 and a rotation center hole 26
allows this rotational center pin 25 to move. Then, since the upper arm 20 is only supported by the eccentric circular hole 17 of the angle adjustment handle 12 by the driven disc part 21, the upper arm 20 can be freely tilted rearward around the driven disc part 21. When the operating lever 35 is released after being tilted backwards an appropriate amount, the rotation center pin 25 enters the rotation fulcrum groove 15 due to the force of the tension spring 31, and the upper arm 20 is therefore held in the tilted position. Along with
In the tilted position, fine adjustment similar to the above can be made by rotating the angle adjustment handle 12. Of course, it is also possible to tilt it forward at the end.

The rotation fulcrum groove formed in the lower bracket 11 is
In this embodiment, there are only two shown by reference numerals 14 and 15, but it is obvious that these can be increased or decreased as appropriate. The case where the rotation center pin 25 is reduced is the case where there is no need to tilt the upper arm 20 and therefore the rotation center pin 25 is provided in a fixed manner. Such an example can be considered, for example, when the present invention is applied to a truck seat, and in this case, processing related to the movement of members such as the release arm 23, the support lever 28, and the rotation center pin 25 is unnecessary. becomes.

In addition, lower bracket 11 and angle adjustment handle 1
2, an angle adjustment handle 12 is provided by vibration.
In order to prevent the upper arm 20 from changing its inclination angle due to rotation, multi-stage rotation prevention notches 36 are formed around the rotation center hole 13 as shown in FIGS. 3 and 4. Preferably, the adjustment handle 12 is provided with a locking protrusion 37 that elastically fits into the locking notch 36. In addition, suitable friction increasing means may be provided. Further, in the above embodiment, the eccentric circular hole portion 17 was provided on the angle adjustment handle 12 side, and the driven disk portion 21 that was fitted into the eccentric circular hole portion 17 was provided on the upper arm 20 side. It is clear that a disk may be provided on the side and a circular hole into which the disk is inserted may be provided on the upper arm 20 side.

As described above, the seat back adjustment device of the present invention rotatably supports the angle adjustment handle on the lower bracket, and includes an eccentric circular hole portion or an eccentric disk portion provided at an eccentric position of the angle adjustment handle, and a lower end of the upper arm. By rotating the angle adjustment handle, the inclination angle of the atsupa arm can be changed around the rotation center pin that is separated from the driven disc part, depending on the relationship between the driven disc part or the driven circular hole part provided in the part. Therefore, the inclination angle of the seat back can be adjusted steplessly without requiring a gear mechanism. Therefore, the difficulty of machining associated with gear machining,
It is possible to obtain a seat back adjustment device that is inexpensive and operates reliably, reliably solving problems such as difficulty in maintaining the system and increased costs. Furthermore, a circular rotation protrusion provided on the angle adjustment handle, and an eccentric disk part or an eccentric circular hole eccentric from the rotation center of the circular rotation protrusion are formed by embossing molding, and the lower end of the Atsupa arm is formed by embossing. Since the driven circular hole part or the driven disc part which is provided in the eccentric disc part or the eccentric circular hole part and rotatably fits into the eccentric circular hole part is formed by embossing molding, there is no need for a separate member during manufacturing.
By integrally forming the circular rotation protrusion and the like with the angle adjustment handle, it is possible to reduce the number of parts, and it is also possible to reduce costs by reducing the number of assembly steps. Furthermore, the strength of the integrally molded circular rotation protrusion is improved compared to the case where a separate rotation member is fixed to the adjustment handle with bolts or the like, so the reliability of the device can be improved.

[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... Angle adjustment handle, 13... Rotation center hole, 14, 15... Rotation fulcrum groove, 17... Eccentric circular hole, 20... Top arm, 21... Driven disc Part, 23... Release arm, 24... Support shaft, 25... Rotation center pin,
27...Movement elongated hole, 30...Detachment cam hole, 31...
...Tension spring.

Claims (1)

[Claims] 1. A lower bracket fixed to the side of the cushion seat; An upper arm rotatably supported by the lower bracket and fixed to the side of the seat bag; Adjusting the angle of the seat bag. In an automobile seat back adjustment device having a rotatable angle adjustment handle, a rotation center hole is formed in the lower bracket;
The angle adjustment handle includes a circular rotation protrusion rotatably fitted into the rotation center hole; an eccentric disk portion or an eccentric circular hole portion located at a position eccentric from the rotation center of the circular rotation protrusion; is provided by emboss molding, and a driven circular hole portion or driven disc portion rotatably fitted into the eccentric disk portion or eccentric circular hole portion is provided at the lower end of the atsupa arm by embossing molding; A seat back adjustment device for an automobile, characterized in that a center of rotation during fine angle adjustment is provided at a position away from the driven circular hole portion or the driven disc portion.