JPH06178711A - Lumber support device - Google Patents

Abstract

PURPOSE:To give an effective feeling to support by a support plate, and improve the effective feeling further. CONSTITUTION:A torsion bar 4 to which a support plate 5 is fixed to support, a waist part and the like of a seated person, is supported in a freely revolvable manner on an output member of a driving mechanism 6, and a link 3 supported in a freely revolvable manner on a bracket 2 and the torsion bar 4 is rotated by operation of the driving mechanism 6 with the rotary center of the link 3 as its fulcrum while using a connecting part between the link 3 and the torsion bar 4 as a point of application. A plane part 4c to support the support plate 5 is formed in the torsion bar 4, and rotation of the support plate 5 to the torsion bar 4 is regulated.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ramper support device capable of supporting the lumbar region of a seated person and adjusting the supporting force.

[0003]

2. Description of the Related Art Conventionally, as this type of lumbar support device, the one disclosed in Japanese Utility Model Laid-Open No. 3-120848 is known. This includes a bracket fixed to the frame of the seat back, a drive mechanism supported by the bracket, a torsion bar rotatably supported by the bracket and linked to the output member of the drive mechanism, and a support plate fixed to the torsion bar. It was one that had.
In this conventional device, since the torsion bar can support the torsion bar without having a winding portion at the time of supporting the torsion bar, only the bending elasticity of the torsion bar serves as a supporting force and the waist plate of the seated person is supported by the support plate. According to the operation of the drive mechanism, the supporting force described above is adjusted by rotating the torsion bar and varying the degree of deflection of the torsion bar.

[0004]

In the lumbar support device described above, since the supporting force of the lumbar region of the seated person by the support plate can be obtained only by the bending elasticity of the torsion bar, it is possible to provide effective support. Become. However, since the output member of the drive mechanism and the torsion bar are engaged at a position different from the center of rotation of the torsion bar,
A play is required between the torsion bar and the output member to allow the rotation of the torsion bar. Therefore, this play allows the rotation of the torsion bar alone.
There was a fear that the support plate would give a feeling of discomfort.

Therefore, it is a technical object of the present invention to provide a support plate with support plates and to improve the support plates.

[0006]

[Constitution of the invention]

[0007]

The first technical means taken in the present invention to solve the above technical problems is a bracket fixed to a frame of a seat back, and a drive mechanism supported by the bracket. A rotation bar rotatably supported by the output member of the drive mechanism; a link rotatably supported by the bracket and linked to the torsion bar; and a support plate fixed to the torsion bar. is there.

A second technical means taken in the present invention to solve the above technical problem is to form a flat portion for supporting the support plate on the torsion bar.

[0009]

According to the first technical means, since the torsion bar can be supported without forming a winding portion, only the bending elasticity of the torsion bar is used as the supporting force to support the waist of the seated person by the support plate. Support will be made. Therefore, a supportive feeling is given.
Further, since the torsion bar is rotatably supported by the output member of the drive mechanism, it is not necessary to form a play for allowing the rotation of the torsion bar in this supporting portion. Therefore, the effectiveness of support by the support plate is further improved.

Further, according to the above-mentioned second technical means, the rotation of the support plate with respect to the torsion bar is suppressed, and the flat support of the lumbar region of the seated person is ensured. Therefore, the effectiveness of support by the support plate is further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the lumbar support device 1 is composed of a bracket 2, a link plate 3, a torsion bar 4, a lumbar plate 5 and a drive mechanism 6, and is arranged in a seat back 8. It

The bracket 2 has a U-shape having a pair of flange walls 2a and a bottom wall 2b connecting the flange portions 2a, and the side wall is a component of the seat back 8 at the bottom wall 2b. It is fixed at 7.

The drive mechanism 6 includes a motor 61 and a reduction mechanism 6
2. It is composed of a screw member 63 and a nut member 64. The speed reduction mechanism 62 is a well-known mechanism including a gear mechanism and a case for housing the gear mechanism, and is fixed to a mounting portion 2c which is disposed between the flange portions 2a of the bracket 2 and which is formed by bending the flange portion 2a inward. ing.

The motor 61 moves in the vertical direction of the seat back (see FIG. 2).
The screw member 63 is arranged to extend in the seat back thickness direction (vertical direction in FIG. 1) and connected to the output shaft of the reduction mechanism 62. Has been done. The nut member 64 is screwed to the screw member 63.

The torsion bar 4 is made of a single piece of hard and rigid wire and has a U-shape bent and formed in the vertical direction of the seat back. The end portion 4a is inserted into the nut member 64 to rotate in the seat back thickness direction. It is supported freely. The vicinity of the vertical bending portion 4b of the torsion bar 4 is further bent and formed in the thickness direction of the seat back to form a flat surface portion 4c continuous from the bending portion 4b.

The link plate 3 has a pair of link portions 3a.
And a connecting portion 3b for connecting between the link portions 3a, which has a U-shape and is formed by a support pin 9 which is arranged between the flange portions 2a of the bracket 2 and which is inserted into the link portion 3a. The mounting portion 2d formed on the portion 2a is supported rotatably in the seat back thickness direction. An engaging portion 3c is formed on the link portion 3a of the link plate 3, and the engaging portion 3c engages with the torsion bar 4 near the end portion 4a of the torsion bar 4. In addition, the end portion 4a of the torsion bar 4 has a through hole 3 formed in the link portion 3a of the link plate 3.
It will be inserted into d and inserted into the nut member 64.

The support plate 5 supports the waist and the like of a seated person, and is composed of two plate members 5a and 5b. The support plate 5 is supported by the flat surface 4b of the torsion bar 4 so that the vertical bending portion 4b and the thickness bending portion 4d are symmetrical with the load center line A as the center. The direction bar 4b is fixed to the torsion bar 4 by caulking. As a result, the support plate 5 supports the waist and the like of the seated person by using the bending elasticity of the torsion bar 4 as a supporting force.

Next, the operation will be described.

When the screw 61 is rotated through the speed reducing mechanism 62 by operating the motor 61, the nut member 64 is rotated.
Moves along the screw member 63. As a result, the torsion bar 4 is rotated in the seat back thickness direction by the engagement with the engaging portion 3c of the link plate 3 (the engaging portion 3c).
The portion engaged with c serves as the point of action and the support pin 9 serves as the fulcrum for this rotational movement), and the support plate 5 attempts to move in the seat back thickness direction. Therefore, the torsion bar 4 is bent and the support plate 5
The support force by is adjusted.

As described above, by using the link plate 3, the end bar 4a is supported by the nut member 64 while the rotation of the torsion bar 4 is ensured by the operation of the drive mechanism 6, so that the torsion bar 4 is supported. Therefore, the torsion bar 4 does not require a winding portion for supporting the torsion bar 4, and the supporting force for supporting the waist plate of the seated person by the support plate 5 is limited to the bending elasticity of the torsion bar 4.
Therefore, a sufficient sense of effect is given to its supporting power. or,
Since the center of rotation of the torsion bar 4 is on the nut member 64, it is not necessary to provide a play for allowing the rotation of the torsion bar 4 at the linking portion between the nut member 64 and the torsion bar 4. Therefore, this play does not impair the effectiveness of the support by the support plate 5, and the effectiveness is further improved. Further, since the support plate 5 is supported by the flat portion 4c of the torsion bar 4, rotation with respect to the torsion bar 4 is restricted.
Therefore, even if the load applied from the seated person to the support plate 5 deviates from the load center line A, the support plate 5
The effectiveness of the support is not impaired and the effectiveness is further improved.

[0022]

According to the present invention, the waist of the seated person is supported by the support plate by using only the bending elasticity of the torsion bar as a supporting force. Therefore, it is possible to give a feeling of effectiveness to the support. Further, since the torsion bar is rotatably supported by the output member of the drive mechanism, it is not necessary to form a play for allowing the rotation of the torsion bar in this supporting portion. Therefore, the feeling of support by the support plate can be further improved as compared with the conventional one. Further, the rotation of the support plate with respect to the torsion bar is suppressed, and the flat support of the waist of the seated person is ensured. Therefore, the feeling of support by the support plate can be further improved as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a plan view of a lumbar support device according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is an exploded perspective view of FIG.

[Explanation of symbols]

 1 Lumber support device 2 Bracket 3 Link plate (link) 4 Torsion bar 5 Support plate 6 Drive mechanism 7 Side frame (frame) 8 Seat back 64 Nut member (output member) 4c Plane part

Claims (2)

[Claims] 1. A bracket fixed to a frame of a seat back, a drive mechanism supported by the bracket, a torsion bar rotatably supported by an output member of the drive mechanism, and a rotatably supported by the bracket. A lumbar support device having a link linked to the torch bar and a support plate fixed to the torch bar. 2. The lumbar support device according to claim 1, wherein the torsion bar has a flat portion for supporting the support plate.