JPH07313295A - Lumbar support - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a lumbar support that provides a uniform support feeling on the left and right. [Arrangement] An arm 13 rotatably provided in a plane substantially orthogonal to the seat back, an arm locking portion 15a locked to a rotating end of the arm 13, and a seated person continuously provided to the arm locking portion 15a. Support plate that can contact the lumbar spine
6 is attached to the support plate attachment portion 15b, the extension portion 15c bent from the support plate attachment portion 15b and extended to substantially the same height as the rotation center of the arm 13, and from the extension portion 15c toward the first side frame 12 direction. Fold,
The torsion bar 15 includes a side frame locking portion 15d that is rotatably engaged with the first side frame 12, and the support plate attachment portion 15b of the torsion bar 15 has a distance from the back surface of the occupant of the arm 13 that is different from that of the arm 13. It is formed so as to gradually become shorter from the engaging portion side toward the extending portion 15c side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumbar support for supporting a lumbar spine of an occupant in a vehicle seat or the like.

[0002]

2. Description of the Related Art Next, a conventional example will be described with reference to the drawings.
FIG. 10 is a configuration diagram of a main part of a conventional lumbar support.

In the drawings, 1 is a first side frame provided on one side of the seat back, and 2 is a first side frame provided on the other side of the seat back so as to face the first side frame 1. 2 side frame. An arm 3 rotatably provided in a plane substantially orthogonal to the seat back surface of the seat back is attached to the first side frame 1 using a pin 3a. Further, the second side frame 2 is formed with a hole 2a coaxial with the pin 3a which is the rotation center of the arm 3.

The torsion bar 4 extends from the arm locking portion 4a, which is locked to the rotating end of the arm 3, and substantially parallel to the seat back surface from the arm locking portion 4a, so that the lumbar vertebra of a seated person can be brought into contact therewith. Support plate mounting portion 4b to which a flexible support plate 5 is mounted, and support plate mounting portion 4b
The bent portion is further bent and extends to approximately the same height as the pin 3a of the arm 3, and the bent portion 4c is bent in the direction of the second side frame to form the hole 2a of the second side frame 2. It is composed of a side frame locking portion 4d that is rotatably engaged.

Next, the operation of the above configuration will be described. Arm 3
When the pin 3a is rotated from the solid line position to the broken line position, the torsion spring 4 also rotates around the hole 2a of the second side frame 2 and moves to the broken line position, and the support plate 5 moves the seated person's lumbar spine. Push.

[0006]

However, in the lumbar support having the above structure, the rigidity of the arm 3 and the rigidity of the torsion bar 4 are significantly different. On the other hand, since the pad is interposed between the support plate 5 and the seat back skin, and the load F from the back of the seated person acts on the support plate 5, the torsion spring 4
The distributed load is acting on.

Therefore, when the arm 3 is rotated from the solid line position (support plate retracted position) to the broken line position (support plate pressing position), the torsion spring 5 moves against the distributed load, but the support plate of the torsion spring 4 is moved. The amount of deflection of the mounting portion 4b increases as it approaches the extension portion 4c, and the amount of extrusion on the extension portion 4c side becomes smaller than the amount of extrusion on the arm locking portion 4a side.

Therefore, there is a problem that the support feeling on the extension portion 4c side is weaker than the support feeling on the arm locking portion 4a side of the support plate 5. The present invention has been made in view of the above problems, and an object of the present invention is to provide a lumbar support that can provide a support feeling that is even on the left and right sides.

[0009]

According to the present invention for solving the above-mentioned problems, a first side frame provided on one side of a seat back and the first side frame on the other side of the seat back are provided.
A second side frame provided so as to face the side frame of the vehicle, an arm rotatably provided on the first side frame in a plane substantially orthogonal to the seat back, and the arm is rotationally driven. Driving means, an arm locking portion that is locked to the rotating end portion of the arm, a support plate mounting portion that is mounted to the arm locking portion, and to which a support plate that can come into contact with the lumbar vertebra of the seated person is mounted, An extending portion that is bent from the support plate mounting portion and extends to approximately the same height as the rotation center of the arm, and is bent from the extending portion toward the second side frame and is rotated to the second side frame. A lumbar support including a side frame locking portion that is engagably engaged, wherein the support plate mounting portion of the torsion bar has a distance from a back surface of a seated person. There is obtained by forming so as to become gradually shorter toward the extending portion side from the arm engaging portion.

Further, it is preferable that the side frame engaging portion of the torsion bar is provided coaxially with the rotation axis of the arm. Also, the side frame locking part of the torsion bar is
It may be provided on the back side of the seated person with respect to the rotation center of the arm.

Further, the drive means is preferably a pinion which is rotationally driven via a brake mechanism and meshes with the sector gear.

[0012]

In the lumbar support of the present invention, when the arm is rotated and the support plate is moved toward the back of the seated person, the support plate mounting portion of the torsion spring is larger on the extending portion side than on the arm engaging portion side. Bend, but the support plate mounting part of the torsion bar is
Since the distance from the back surface of the seated person is gradually shortened from the arm locking part side toward the extension part side, the pushing amount of the support plate on the arm locking part side and the extension part side It is almost equal to the extrusion amount.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described with reference to FIGS. First, the overall configuration of this embodiment will be described with reference to FIGS. 2 is a rear view of FIG. 1, and FIG.
2 is a plan view in FIG. 2, FIG. 4 is a view in the direction of arrow A in FIG. 2, and FIG. 5 is a plan view of the driven gear in FIG.
11 is a first side frame provided on one side of the seat back, and 12 is a first side frame provided on the other side of the seat back.
The second provided so as to face the side frame 11 of
It is the side frame of. The bracket 9 provided on the first side frame 11 is provided with a driven gear 13 as an arm rotatably attached using a pin 14 in a plane substantially orthogonal to the seat back.

A groove 13a and a hole 13b are formed in the vicinity of the groove 13a at the rotary end of the driven gear 13. Further, 13c is a sector gear portion centering on the rotation center of the driven gear 13.

The torsion bar 15 is a driven gear 13
Support plate 16 which is inserted through the groove 13a, is fitted into the hole 13b and is caulked, and the support plate 16 which is connected to the arm engagement part 15a and is capable of contacting the lumbar part of the seated person The driven gear 1 is bent from the mounting portion 15b and the support plate mounting portion 15b.
The extension portion 15c that extends to substantially the same height as the pin 14 that is the rotation center of 3 and the pin 14 that is the rotation center of the driven gear 13 are bent from the extension portion 15c toward the second side frame 12 The side frame engaging portion 15d is rotatably engaged with the hole 12a formed in the second side frame.

The bracket 9 is provided with a brake mechanism 20 shown in FIGS. 6 to 8. 6 is an exploded perspective view of the brake mechanism in FIG. 2, and FIGS. 7 and 8 are diagrams for explaining the operation of the brake mechanism in FIG.

In this brake mechanism 20, a torsion spring 22 is arranged in a brake housing 21 so as to press the inner wall of the brake housing 21, and a core 23 having a notch 23a formed inside the torsion spring 22 rotates. It is inserted as possible. The core 23 is integrally fixed to the handle shaft 24. Further, in the space of the notch 23a of the core 23 and between the hook portions 22a and 22b of the torsion spring 22, the stopper plate 2 formed integrally with the pinion 25 that meshes with the sector gear portion 13c of the driven gear 13 is formed.
The six claw portions 26a are rotatably inserted around the handle shaft 24.

Therefore, as shown in FIG. 7, the pinion 25
With respect to the rotational force from the side, the claw portion 26a pushes the hook portion 22a or 22b of the torsion spring 22 and acts to widen the outer diameter of the torsion spring 22.
The pressure contact force with 1 becomes strong, and the rotation of the pinion 25 is blocked. On the other hand, as shown in FIG. 8, with respect to the rotational force from the side of the handle shaft 24, the hook portion 22a or 22b of the torsion spring 22 receives a force in the direction of reducing the outer diameter from the side end portion 23b or 23c of the core 23. Therefore, the pressure contact force is reduced, the handle shaft 24 can be rotated, and the pinion 25 can be rotated via the torsion spring 22 and the claw portion 26a.

Next, the shape of the torsion bar 15 will be described in detail with reference to FIG. FIG. 1 is a configuration diagram for explaining a main part of a first embodiment of the present invention. In the support plate mounting portion 15b of the torsion bar 15 of the present embodiment, the distance from the back surface of the seated person extends from the arm locking portion 15a side to the extending portion 15c.
It is formed so that it becomes gradually shorter toward the side. In FIG. 1, the alternate long and short dash line indicates the support plate mounting portion 15
This is the position when the distance between b and the back of the seated person is parallel.

Next, the operation of the above configuration will be described. When the handle shaft 24 of the brake mechanism 20 rotates, the pinion 25 rotates. Then, the driven gear 13 meshing with the pinion 25 rotates around the pin 14, the torsion bar 15 rotates around the hole 12a of the second side frame 12 toward the back side of the seated person, and the support plate 16 moves toward the seated person. Press the lumbar spine.

When the rotation of the handle shaft 24 is stopped, the brake mechanism 20 maintains the state. Further, when the handle shaft 24 is rotated in the opposite direction to the above, the torsion bar 15 causes the second side frame 1 to move.
It rotates in the direction away from the back surface of the seated person around the second hole 12a, and the pressing of the support plate 16 on the lumbar vertebra of the seated person is released.

According to the above construction, when the driven gear 13 is rotated and the support plate 16 is moved toward the back of the seated person, the support plate mounting portion 15b of the torsion bar 15 extends more than the arm locking portion 15a side. Debu 1
Although the 5c side is largely bent, the support plate mounting portion 15b of the torsion bar 15 is formed such that the distance from the back surface of the seated person gradually decreases from the arm locking portion 15a side toward the extending portion 15c side. The push-out amount of the support plate 16 on the arm locking portion 15a side and the extension portion 15
The amount of extrusion on the c side is substantially equal, and a uniform support feeling on the left and right can be obtained.

Next, FIG. 9 for explaining the main part of the second embodiment.
A second embodiment of the present invention will be described using. The difference between the present embodiment and the first embodiment is the torsion bar 30, and the other parts are the same as the first embodiment, so the same parts are denoted by the same reference numerals and their description is omitted. Omit it.

The torsion bar 30 of this embodiment has an arm engaging portion 30a which is inserted through the groove 13a of the driven gear 13 and fitted into the hole 13b and caulked, and an arm engaging portion 30.
A support plate attachment portion 30 to which a support plate 16 that is connected to a and is capable of contacting the lumbar portion of a seated person is attached
b, an extending portion 30c that is bent from the support plate mounting portion 30b and extends to approximately the same height as the pin 14 that is the rotation center of the driven gear 13, and is bent from the extending portion 30c toward the second side frame 12 Then, the pin 14 which is the rotation center of the driven gear 13 is constituted by the side frame locking portion 30d which is rotatably engaged with the hole 12a 'formed in the second side frame provided on the back side of the seated person. .

Also in this embodiment, when the driven gear 13 is rotated and the support plate 16 is moved toward the back of the seated person, the support plate mounting portion 30b of the torsion bar 30 extends more than the arm locking portion 30a side. The support plate attachment portion 30b of the torsion bar 30 is formed so that the distance from the back surface of the seated person gradually decreases from the arm locking portion 30a side toward the extension portion 30c side, although the extension portion 30c side is largely bent. Therefore, the push-out amount on the arm locking portion 30a side of the torsion bar 30 and the extension portion 30
The amount of extrusion on the c side is substantially equal, and a uniform support feeling on the left and right can be obtained.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the pinion 25 driven via the brake mechanism 20 is used as the drive means, but the driven gear 13 may be directly rotated via the speed reduction mechanism including the worm and the worm wheel. In this case, the brake mechanism is unnecessary.

[0027]

As described above, according to the present invention, the distance between the support plate mounting portion of the torsion bar and the back surface of the seated person is gradually shortened from the arm engaging portion side toward the extending portion side. By forming it, it is possible to realize a lumbar support that can provide a uniform support feeling on the left and right.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating a main part of a first embodiment of the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a view on arrow A in FIG.

5 is a plan view of the driven gear in FIG. 1. FIG.

FIG. 6 is an exploded perspective view of the brake mechanism in FIG.

FIG. 7 is a diagram illustrating the operation of the brake mechanism in FIG.

FIG. 8 is a diagram illustrating the operation of the brake mechanism in FIG.

FIG. 9 is a diagram illustrating a main part of a second embodiment of the present invention.

FIG. 10 is a configuration diagram of a main part of a conventional lumbar support.

[Explanation of symbols]

 11 First Side Frame 12 Second Side Frame 13 Driven Gear (Arm) 15 Torsion Bar 15a Arm Locking Part 15b Support Plate Attachment Part 15c Extending Part 15d Side Frame Locking Part 16 Support Frame 20 Brake Mechanism (Drive Means) 25 pinion (drive means)

Claims (4)

[Claims] 1. A first side frame (11) provided on one side portion of a seat back, and a first side frame (11) provided on the other side portion of the seat back so as to face the first side frame (11). A second side frame (12), an arm (13) rotatably provided on the first side frame (11) in a plane substantially orthogonal to the seat back, and the arm (13). Driving means (20, 2) for rotational driving
5), an arm locking portion (15a) locked to the rotating end of the arm (13), and a support plate that is connected to the arm locking portion (15a) and is capable of contacting the lumbar portion of a seated person. A support plate mounting portion (15b) to which (16) is mounted, an extending portion (15c) bent from the support plate mounting portion (15b) and extending to substantially the same height as the rotation center of the arm (13), A torsion bar (15d) that is bent from the extending portion (15c) toward the first side frame (12) and is rotatably engaged with the first side frame (12). 15), the distance between the support plate mounting portion (15b) of the torsion bar (15) and the back surface of the seated person is greater than the extension portion (1) from the arm (13) locking portion side. Lumbar support for c) toward the side, characterized in that it is formed so as to gradually become shorter. 2. The lumbar support according to claim 1, wherein the side frame engaging portion of the torsion bar is provided coaxially with a rotation axis of the arm. 3. The lumbar support according to claim 1, wherein the side frame locking portion of the torsion bar is provided on the back side of the seated person with respect to the rotation center of the arm. 4. The lumbar support according to claim 1, wherein the drive means is a pinion that is rotationally driven via a brake mechanism and meshes with the sector gear.