JPH0415081Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a lumbar support structure for an automobile.

(Prior art and its problems) Conventionally, lumbar support devices have been put into practical use that allow the support plate placed inside the seat back of an automobile seat to be moved up and down, or the strength of the spring force of the arm of the support plate to be adjusted. ing.

By the way, the mechanism for adjusting the strength of the spring force of the arm of the support plate usually involves pushing down the rear end of the arm, which supports the support plate at its tip, with a cam of a strength control shaft to adjust the spring force in the longitudinal direction of the arm. However, when the arm is moved up and down to move the support plate up and down, the contact position between the rear end of the arm and the cam changes, so the range of strength adjustment changes and the operation becomes difficult. I had a problem with feeling unwell.

(Purpose of the invention) The present invention was made in order to solve the above-mentioned problem, and its purpose is to ensure that the range of strength adjustment is always the same regardless of the vertical movement position of the arm.

(Structure of the invention) For this reason, the present invention includes a mechanism in which a support plate is arranged inside the seat bag of an automobile seat, and a mechanism for vertically moving an arm supporting the support plate at its tip, and a mechanism for pushing down the rear end of the arm. A mechanism is provided for increasing or decreasing the spring force in the longitudinal direction of the arm, and the arm strength adjustment mechanism is movable in parallel to the cam of the strength operation shaft supported on the base board and the link arm to the base board. The arm is supported by a push plate located between the cam and the rear end of the arm.

(Operations and Effects of the Invention) In the present invention, the rear end of the arm is pushed down by the cam of the strength/weakness operation shaft via the push plate that moves in parallel. Even in the moving position, the contact position with the cam does not change, so the range of strength adjustment does not change, resulting in a good operating feel.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 4, a rectangular seat back frame 2 is provided in a seat back 1 of an automobile seat, and a left part (right part in FIG. 2) of the seat back frame 2 is provided with a rectangular seat back frame 2. A substantially inverted L-shaped base board 3 is fixed, and a lumbar support device 4 is attached to the base board 3.

As shown in FIG. 1, the lumbar support device 4 has a bearing sleeve 5 fixed to the side plate 3a of the base board 3 that protrudes outward, and a cylindrical strong and weak part that protrudes inwardly and outwardly. The operating shaft 6 is fitted, and the strong/weak operating shaft 6
A vertical operation shaft 7 protruding inwardly and outwardly is coaxially fitted in the upper and lower sides.

A cam 8 is fixed to the inner end of the strength operating shaft 6, and a chain sprocket 9 is fixed to the inner end of the vertical operating shaft 7.

Further, a manual operation dial, a lever (not shown), etc. are fixed to the outer end of each operation shaft 6, 7.

A screw shaft 11 is supported between a bearing block 10 fixed to the upper part of the bottom plate part 3b of the base board 3, and the lower part of the bottom plate part 3b and the rising part 3c,
A spiral gear 12 is fixed to the lower part of the screw shaft 11, and the spiral gear 12 is connected to the lower rising part 3.
It is meshed with the spiral gear 13 which is supported by c.
A chain sprocket 14 is fixed to the spiral gear 13, and a chain 15 is stretched between the chain sprocket 14 and the chain sprocket 9 of the vertical operation shaft 7.

Therefore, when the vertical operation shaft 7 is rotated, the chain sprocket 9 is moved from the chain 1 to the chain sprocket 9.
5→chain sprocket 14→spiral gear 13→spiral gear 12, the screw shaft 11 is rotated.

A nut block 16 is screwed onto the screw shaft 11, and rotation of the screw shaft 11 causes the nut block 16 to move up and down.

An intermediate portion of an arm 17 is fixed to the nut block 16, and a tip 17a of the arm 17 is extended inward and bent upward at approximately the middle position of the seat back 1 in the vehicle width direction. A rectangular support plate 18 is swingably attached.

The rear end portion 17b of the arm 17 extends outward and is bent downward along the side plate portion 3a.

A substantially inverted L-shaped push plate 19 is disposed on the inner surface of the side plate portion 3a of the base substrate 3, while two upper and lower push plates 19, one end of which is pivotally attached to the outer surface of the side plate portion 3a of the base substrate 3, are arranged on the inner surface of the side plate portion 3a of the base substrate 3. The pins 21, 21 at the other ends of the links 20, 20 are connected to the side plate portion 3 of the base board 3.
The push plate 19 is inserted through the long holes 3d, 3d and fixed to the side plate 19a of the push plate 19, and is supported by the links 20, 20 so that the push plate 19 can move in parallel in the front-rear direction.

The side plate portion 19a of the push plate 19 includes:
A hole 19b for escaping the strength/weakness operation shaft 6 is provided so as not to hinder parallel movement in the front-rear direction.

The bottom plate 19c of the push plate 19 is interposed between the cam 8 and the rear end 17b of the arm 17, and the cam 8 pushes the rear end 17b of the arm 17 through the bottom plate 19c of the push plate 19. becomes depressed.

With the above configuration, in order to adjust the vertical position of the support plate 18, the vertical operation shaft 7 is rotated, and the chain sprocket 9 is rotated.
→ Chain 15 → Chain sprocket 14 → Spiral gear 13 → The screw shaft 11 is rotated via the spiral gear 12, and the nut block 16 moves up and down, and together with the nut block 16, the arm 1
By vertically moving 7, the vertical position of the support plate 18 can be adjusted.

Next, to adjust the strength of the spring force of the arm 17 of the support plate 18, use the strength operation shaft 6.
When the cam 8 is rotated, the cam 8 rotates.
The push plate 19 is pushed down, and the rear end 17b of the arm 17 is pushed down by the bottom plate 19c of the push plate 19, and the spring force of the arm 17 changes, so that the spring force of the arm 17 of the support plate 18 is The strength of the force can be adjusted.

At this time, no matter what vertical movement position the arm 17 is in, the push plate 19 pushed down by the cam 8 is moved in parallel by the links 20, 20.
Since the contact position with the rear end portion 17b of the arm 17 does not change, the range of strength adjustment does not change.
Good operational feel.

Further, the strength/weakness operation shaft 6 and the vertical operation shaft 7 are provided coaxially and can be operated at the same position, resulting in good operability.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the lumbar support device according to the present invention, Figure 2 is a front view of a seat bag equipped with the device shown in Figure 1, Figure 3 is a side view of Figure 2, and Figure 4 is the side view of Figure 2. FIG. 1... Seat bag, 3... Base board, 4...
...Lumbar support device, 6...Strength/weakness operation shaft, 7...Vertical operation shaft, 8...Cam, 16
...nut block, 17...arm, 17a...
...Tip part, 17b... Rear end part, 18... Support plate, 19... Push plate, 20...
Link.

Claims (1)

[Scope of utility model registration request] A support plate is disposed inside the seat back of an automobile seat, and has a mechanism that moves up and down an arm that supports the support plate at its tip, and a mechanism that presses down the rear end of the arm to strengthen or weaken the spring force in the longitudinal direction of the arm. A mechanism is provided, and the strength adjustment mechanism of the arm is configured to include a cam of a strength operation shaft supported on a base board, a link arm supported by the base board so as to be movable in parallel, and a rear end of the cam and the arm. A lumbar support structure for an automobile, characterized by comprising a push plate located between the lower part and the pusher plate.