JPH053081Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a lumbar support that supports the lumbar region of a person sitting in an automobile seat.

(Prior art) Conventionally, as a lumbar support, the
One disclosed in Publication No. 7408 is known. This is configured so that in addition to the longitudinal movement adjustment as a normal lumbar support, by adding a link mechanism, the movement can also be adjusted in the vertical direction.

However, in the conventional lumbar support described above, in addition to the structure for adjusting the longitudinal movement, the link mechanism is added, making the structure complicated and the number of parts reduced accordingly.

(Purpose of the invention) This invention was made to eliminate these conventional drawbacks; it has a simple configuration that allows for adjustment of movement in the front and back and up and down directions, and also reduces the number of parts. It provides lumbar support.

(Structure of the device) In this device, a vertical portion formed on one side of the torsion bar is rotatably supported around its axis by a support bracket attached to the seatback frame, and the shaft of the operating lever is A support whose body is rotatably supported around a horizontal axis, a cam fixed to the operating lever is engaged with the torsion bar, and is attached to the other side of the torsion bar by rotating the operating lever. In a lumbar support for an automobile seat configured such that a plate moves in the front-rear direction of the seat, the operating lever (first operating lever)
A shaft of a second operating lever is inserted into the shaft of the second operating lever so as to be rotatable about the shaft, and the shaft of the second operating lever protrudes from the tip of the shaft of the first operating lever. Holding members are screwed onto the protruding shaft portions so as to be movable along the shaft, and one end of the vertical portion of the torsion bar is tiltably supported by the holding members. At the same time, the other end of the vertical portion is supported by the support bracket so as to be swingable about a horizontal axis.

According to the above configuration, the vertical portion of the torsion bar supported by the support bracket and the holding member rotates around its axis by rotating the first operating lever, and thereby the support plate moves in the front-back direction. Furthermore, as the holding member moves along the shaft of the second operating lever by rotating the second operating lever, the vertical portion of the torsion bar is tilted around the horizontal axis, thereby causing the holding member to move along the shaft of the second operating lever. The support plate moves in the vertical direction.

(Embodiment) In FIG. 1, a support bracket 2 is fixed to one side of a seat back frame 1. As shown in FIG. This support bracket 2 consists of a pair of side support pieces 21a, 21b formed in the width direction of the seat S (horizontal direction in FIG. 1) and an upper support piece 21c. The cylindrical shaft 31 of the operating lever (first operating lever) 3 that passes through the shaft 31 and the shaft 41 of the operating dial (second operating lever) 4 inserted into this shaft portion 31 are connected to the horizontal axis a.
are arranged coaxially and rotatably independently of each other. A lumbar cam 32 is fixed to the shaft body 31 of the operating lever 3, and this lumbar cam 32 is engaged with the torsion bar 5.

The torsion bar 5 is formed into a substantially L-shape as shown in FIGS. 1 and 2. A support plate 6 is attached to the tip of the horizontal portion 52 of the torsion bar 5, and the upper end of the vertical portion 51 is attached to the support bracket. Rotatable around the vertical axis b by the upper support piece 21c of No. 2, and this upper support piece 21c
The above-mentioned vertical portion 5 is centered on the portion sandwiched by
1 is tiltably held via a synthetic resin clamping member 22. The upper end of this vertical portion 51 is bent toward the outside of the seat S, and a folded portion 53 is formed continuously on the outside of the seat back frame 1 in parallel with the vertical portion 51.

The bent portion 5 formed in this folded portion 53
4 engages with the lumbar cam 32, and by rotating the operating lever 3 about the horizontal axis a, the vertical portion 51 of the torsion bar 5 is rotated about the vertical axis b, and this rotational operation causes the support plate 6 to rotate. 3, the seat 1 can swing in the front-rear direction (vertical direction in FIG. 3), as shown by a solid line and a two-dot chain line in FIG.

At the base end of the shaft body 31 of the operating lever 3, there is a mounting portion 31 whose upper and lower surfaces are cut flat, as shown in FIG.
1 is formed, and a lever part 3 is attached to this attachment part 311.
3 are installed in a fitted state. As a result, the rotational operating force of the lever portion 33 is transmitted to the lumbar cam 32. A bush 34 attached to the outer support piece 21a is fitted around the shaft 31 of the operating lever 3 between the lumbar cam 32 and the inner surface of the outer support piece 21a.

As shown in FIG. 4, the inner hole 31 of the shaft 31 of the operation lever 3 is located in the middle of the shaft 41 of the operation dial 4.
A flange portion 411 larger than 2 is formed, and this flange portion 4
On one side of 11, the outer diameter is the shaft body 3 of the operating lever 3.
The rotating shaft portion 41 is set to be approximately the same as the inner diameter of 1.
2. A helical shaft portion 413 is formed on the other side.

As shown in FIG. 3, the rotary shaft portion 412 is disposed so as to penetrate through the inner hole 312 of the shaft body 31 of the operating lever 3 so that its tip protrudes, and the dial portion 42 is attached to this tip. The dial portion 42 is attached via a mounting portion 414 (see FIG. 4) formed by notching the top and bottom surfaces of the rotating shaft portion 412, and a bushing 421 that fits into the mounting portion 414. screw 422
This will be done by.

The tip of the screw shaft portion 413 is rotatably supported in a fixed position by the inner support piece 21b, and the screw shaft portion 4
A holding member 43 is screwed into the holding member 13 so as to be movable in the direction of the horizontal axis a. The holding member 43 is a nut formed into a substantially U-shape by a pair of guide support parts 431, as shown in FIG. 4, and a screw hole 432 is formed at the tip of the pair of guide support parts 431. At the same time, the pair of guide support parts 431 have a convex curved surface 4.
33 are formed to face each other.

The width between the tips of this convex curved surface 433 is set to be approximately the same as the outer diameter of the vertical portion 51 of the torsion bar 5, and as shown in FIG. 2, the lower end of the vertical portion 51 can be rotated around the vertical axis b. We support and
Vertical portion 51 in an inclined state shown by a two-dot chain line in the same figure.
can be held between the tips of the convex curved surface 433.

The torsion bar 5 and the support plate 6 are attached via a connecting member 55 having a circular cross section as shown in FIG.
is held by the support plate 6 so as to be rotatable around the vertical axis c as shown in FIG.
As shown in FIG. 3, it is rotatably mounted around a horizontal axis d. Furthermore, the support plate 6 is provided with the connection member 55 as shown in FIG.
An elongated hole 61 inclined at a predetermined angle is formed above the elongated hole 61, and a pin 111 fixed to the S spring 11 constituting the seat S is inserted into the elongated hole 61 so as to protrude therefrom. By this, torsion bar 5
Even if the horizontal portion 52 of the support plate 6 is tilted in the longitudinal direction and the vertical direction with respect to the seat S, the support plate 6 can be moved in parallel.

In the lumbar support configured as described above, when the operating lever 3 is rotated around the horizontal axis a, the lumbar cam 32 is rotated, thereby causing the folded portion 53 of the torsion bar 5 to move vertically as shown by the two-dot chain line in FIG. Since the seat S is tilted in the front-rear direction about the portion 51, the support plate 6 moves in the front-rear direction of the seat S. Therefore, by rotating the operating lever 3, the support plate 6
can be moved and adjusted to the desired longitudinal position.

Further, in order to adjust the movement of the support plate 6 in the vertical direction, the holding member 43 may be moved in the direction of the horizontal axis a by rotating the operating dial 4.
That is, when the holding member 43 is moved inward of the seat along the horizontal axis a as shown by the dashed line in FIG. 2 by rotating the operation dial 4, the torsion bar 5 is moved to the upper support piece 21c The support plate 6 can thus be tilted clockwise about the vertical portion 51 thus held, thereby allowing the support plate 6 to move upward. At this time, since the elongated hole 61 is guided by the pin 11, the support plate 6 can be moved in parallel from the original state shown by the solid line. By rotating and adjusting the operation dial 4 in this manner, the vertical position of the support plate 6 can be adjusted. Note that when the operation dial 4 is rotated, the holding member 43 does not rotate together with the operation dial 4 because the vertical portion 51 of the torsion bar 5 is sandwiched therebetween.

In this way, the support plate 6 can be adjusted to move in the longitudinal direction and the vertical direction of the seatback frame 1, so that the lumbar region of the seated person can be supported in an optimal state depending on the seated person.

In the above embodiment, the upper end of the vertical portion 51 of the torsion bar 5 is supported by the upper support piece 21c, and the lower end is held by the holding member 43. However, for example, if the torsion bar 5 is turned upside down, The upper end of the vertical portion 51 is placed on the holding member 4
It may be configured to move by 3.

Further, the dial portion 42 of the operation dial 4 in the above embodiment may have various shapes, such as a circular shape, a T-shape, or an X-shape.

(Effects of the invention) According to the lumbar support for a car seat of this invention, the torsion bar rotates around the vertical axis by rotating the first operating lever, thereby moving the support plate in the front-rear direction of the seat. The torsion bar can be rotated about the horizontal axis by rotating the second operating lever, thereby adjusting the movement of the support plate in the vertical direction of the seat. Furthermore, the number of parts can be reduced compared to conventional lumbar supports.

[Brief explanation of the drawing]

FIG. 1 is a front explanatory view showing an embodiment of this invention;
Figure 2 is an enlarged explanatory view of the main parts of Figure 1, Figure 3 is a horizontal sectional view of the lumbar support in Figure 2 seen from below, and Figure 4 is an exploded perspective view of the operating lever and operating dial. be. 1... Seat back frame, 2... Support bracket, 3... Operating lever (first operating lever),
4... Operation dial (second operating lever), 5...
...Torsion bar, 6...Support plate, 3
DESCRIPTION OF SYMBOLS 1... Shaft of operating lever, 32... Lumbar cam, 41... Shaft of operating dial, 43... Holding member, 51... Vertical portion of torsion bar.

Claims (1)

[Scope of utility model registration request] A support bracket attached to the seatback frame supports the vertical part formed on one side of the torsion bar so that it can rotate around its axis, and the shaft of the operating lever can also rotate around its horizontal axis. A supported cam fixed to the operating lever is engaged with the torsion bar, and by rotating the operating lever, a support plate attached to the other side of the torsion bar moves in the front-rear direction of the seat. In the lumbar support for an automobile seat configured as above, the shaft of the second operating lever is inserted into the shaft of the operating lever (the first operating lever) so as to be rotatable about the axis thereof, and The shaft of the second operating lever is arranged to protrude from the tip of the shaft of the first operating lever, and a holding member is screwed into each other so as to be movable along the shaft. one end of the vertical portion of the torsion bar is tiltably supported by the holding member, and
A lumbar support for an automobile seat, wherein the other end of the vertical portion is supported by the support bracket so as to be swingable around a horizontal axis.