JPS6330279Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lumbar support device for an automobile seat.

In general, supporting the occupant's lumbar region with appropriate force is effective in reducing occupant fatigue.
In order to ensure a comfortable drive, this type of lumbar support device is put into practical use in luxury cars and the like.

However, conventional lumbar support devices of this type
Although the lumbar support part can be adjusted in the longitudinal direction of the seat back, most of the lumbar support parts cannot be adjusted in the vertical direction, and there is a problem in that it is not possible to make optimal adjustments according to the physique of the occupant.

In addition, some lumbar support devices that can be adjusted in the vertical direction have been proposed, as shown in Japanese Patent Application Laid-Open No. 53-74961, but they are complicated in structure and expensive, and are not practical. I had an unrelated problem.

The present invention has been developed in view of these conventional problems, and while having a simple structure, it is possible to easily and reliably adjust the position of the lumbar vertebrae in the anteroposterior and vertical directions, and at an extremely low cost. It is an object of the present invention to provide a lumbar support device for an automobile seat that can be manufactured.

Hereinafter, the present invention will be described in more detail based on illustrated embodiments.

As shown in FIG. 1, an automobile seat 1 consists of a seat cushion 2 and a seat back 3. The seat back 3 has a seat back frame 4 embedded therein, and the lower end of the seat back frame 4 is connected to the rear side of the seat cushion 2. It is connected to the seat cushion 2 in this state.

The lumbar support device 5 according to the present invention has a lumbar support arm 7 supported by a support bracket 6 fixed to the lower part of one side of the seatback frame 4, as shown in FIG. 1 with the lower part of the seatback 3 cut away. Operation handle 8 provided on the outside of the seat back 3
The basic structure allows the position of the lumbar support portion 7a to be adjusted to the optimum position for the occupant by swinging the seat back 3 in the longitudinal direction has.

As shown in FIG. 2, the support bracket 6 is
A first support wall 6b extends inward parallel to the seat bag 3 with an arcuate portion 6a fixed to the seat bag frame 4 by welding or the like in between, and a second support wall 6b stands up in front of the seat bag 3. As shown in FIGS. 3 and 4, a pair of upper and lower small brackets 6d and 6e are formed by bending the inward end of the first supporting wall 6b. A lever 12 is supported by a hinge pin 11 in the direction so that the intermediate portion thereof can swing freely in the front and rear directions.

The inward end of the swing lever 12 is connected to the base 7 of the lumbar support arm 7 by a hinge pin 13.
b, and the lumbar support arm 7 is placed in the vertical plane (first
(see y-direction in the figure). In the example shown in FIG. 2, the lumbar support arm 7 is connected to the lumbar support part 7.
It is composed of an arm portion 7c having a tip a formed at its tip and the base portion 7b having an upwardly protruding lever portion 7d, and the upper and lower ribs of the arm portion 7c and the base portion 7b
The upper and lower ribs of the side are overlapped and hingedly connected by the vertical connecting pin 14, and the arm part 7
A coil spring 15 is tensioned between the base end of the arm 7c and the hinge pin 11 to elastically support the arm portion 7c, that is, the lumbar support portion 7a, so that the lumbar region of the occupant can be elastically supported. ing.

On the other hand, on the lower side of the second support wall 6c of the support bracket 6, the rotating shaft 8a of the operating handle 8 facing the side of the seat bag 3 is supported by a bearing member 16, so that the rotating shaft 8a is free to face inward. An eccentric cam 17 is fixed to the end.

The eccentric cam 17 is rotatable between a pair of stopper convex portions 17a and 17b that abut a locking piece 18 projecting inward from the second support wall 6c, as shown in FIG. As shown in FIG. 2, a total of three recesses 17c and 17 are provided on the cam surface opposite to the stopper convex portions 17a and 17b at different distances from the center of rotation of the rotation shaft 8a of the operating handle 8.
d and 17e are provided as multi-stage engaging portions according to the present invention, while these recessed portions 17c, 17d, and 17e
, a convex portion 19 as a locking portion that engages with one of the levers is provided at the other end of the swing lever 12, and by operating the operating handle 8, the rotating shaft 8a is rotated. By rotating the fixed eccentric cam 17, the swing lever 12 can be swung in a total of three stages in the front-rear direction about the hinge pin 11.

Further, on the upper part of the second support wall 6c of the support bracket 6, an operation dial 9 is fixed to the outer end of a shaft part 23 which is rotatably supported by a retaining ring 22, with the female thread part 21 inside. Part 2
The threaded portion 24a of the actuating rod 24 is screwed into the threaded hole 21a of No. 1 by rotating the operating dial 9. The other end of the actuating rod 24 is bent at a right angle to form a hook portion 24b.
is the elongated hole 7 provided in the lever portion 7d of the base portion 7b.
e and connect it to the lumbar support arm 7.

In this case, as shown in FIG. 4, when the operating dial 9 is rotated in either the forward or reverse direction, the actuating rod 24 moves back and forth in the axial direction, and as a result, the lumbar support arm 7 is rotated around the hinge pin 13. rock it,
The lumbar support portion 7a can be displaced in the vertical direction y in FIG. 1, and the lumbar support height can be optimally adjusted.

As described above, the present invention rotates the eccentric cam by swinging the swinging operation member, and swings the lumbar support arm in the front-rear direction of the seat back via the corresponding swing lever. On the other hand, the lumbar support arm hinged to the swing lever is swung in a vertical plane by the operation of the operating dial member, and the lumbar support part is vertically displaced. A lumbar support device is provided.

According to the present invention, although the structure is simple, the lumbar support part can be easily adjusted both in the front and back direction of the seat back and in the vertical direction, and the lumbar support part can be optimally supported according to the occupant's preference. and can be provided at low cost.

More specifically, in the present invention, the lumbar support arm is oscillated in the vertical direction by screw-feeding the actuating rod by operating the operating dial member, allowing for delicate adjustments and a special locking mechanism. It is not necessary and the operation can be performed stably. Furthermore, the eccentric cam that performs adjustment in the longitudinal direction and the lumbar support lever are stably connected to each other by engagement between the locking portion and the engaging portion.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of essential parts of an automobile seat showing a lumbar support device according to an embodiment of the present invention, FIG. 2 is a perspective view of the lumbar support device seen from below, and FIG.
4 is a front view showing the operation when the operation dial is operated, and FIG. 5 is a sectional view taken in the - line direction of FIG. 2. DESCRIPTION OF SYMBOLS 1... Automobile seat, 2... Seat cushion, 3... Seat back, 4... Seat back frame, 6... Support bracket, 7... Lumbar support arm, 8... Operating handle, 9... Operating dial. , 12... Swing lever, 17... Eccentric cam, 2
4...Operating rod.

Claims (1)

[Scope of utility model registration request] A support bracket having a first support wall extending inward in the width direction of the seat bag and a second support wall standing up in front of the seat bag, and fixed to one side of the seat bag frame, and a first support of the support bracket. a swinging lever whose intermediate portion is hinge-supported to the wall so as to be able to swing in the front-back direction of the seat bag; a lumbar support arm that is hinge-connected to the inward end of the swing lever so that the seat bag can swing in the up-and-down direction; A swing operation member whose shaft portion is supported by a bearing on the second support wall of the support bracket, and a swing operation member fixed to the free end side of the shaft of the swing operation member and engaged with a locking portion provided at the other end of the swing lever. An eccentric cam provided with a multi-stage engaging portion that fits together, an operation dial member rotatably supported by a bearing on the second support wall of the support bracket, and one end connected to a screw hole provided in the shaft of the operation dial member. and an actuating rod that is screwed together so as to move forward and backward in the axial direction, and the bent portion at the other end is fitted into an elongated hole formed in the swinging direction of the lever portion that projects above the hinge portion of the lumbar support arm. , a lumbar support for an automobile seat in which the lumbar support arm is oscillated in the vertical direction by operating a swing operating member to move the lumbar support arm forward and backward, and by operating an operating dial member to screw feed the actuating rod. Device.