JP2576479B2 - Seat back spring structure for automotive seat - Google Patents

Description

Description: Object of the Invention (Industrial Application Field) The present invention relates to a spring structure disposed on a seat back of an automobile seat, and in particular, a seat back in which a lumbar support device is disposed in the seat back. Suitable for.

(Background Art) A seat back of an automobile seat includes a seat back frame, a seat back spring disposed on the seat back frame, a seat back spring elastically supported by the seat back spring, and A cover for covering the seat back cushion.

The conventional seat back spring is Japanese Patent Publication No. 54-16786.
As described in the above item, a plurality of S springs are formed on the seat back frame in the horizontal direction. As a result, the lumbar support device disposed in the lower portion of the seat back can adjust its front / rear position against the urging force of only the opposing S spring. Therefore,
The operability of the lumbar support device was good.

(Problems to be Solved by the Invention) However, since a plurality of S springs are individually arranged in the horizontal direction, it is extremely difficult to configure an ideal support state in the vertical direction of the seat back. . For this reason, there is a problem that the supporting force is different for each S spring and the sitting comfort is poor.

Therefore, it is a technical object of the present invention to obtain an ideal supporting shape in the vertical direction of the seat back while securing the flexibility of the lower portion of the seat back.

[Configuration of the invention]

(Means for Solving the Problems) The measures taken in the present invention for solving this problem are as follows: a seat back frame of an automobile seat; and a seat back frame which is disposed in a horizontal direction and has a fish mouth portion at both ends thereof. It consists of several supported form wires and several wires vertically arranged at the center of the seat back frame, and several wires vertically arranged at the top of the seat back frame. The upper wire disposed in the lower part of the seat back frame and the lower wire disposed in the lower part of the seat back frame are divided into a form wire disposed horizontally at a predetermined height from the lower end of the seat back frame. The lower end of the upper wire is connected to the upper end of the lower wire, and the upper and lower wires are independently elastically deformable.

(Operation) In this way, several wires arranged in the vertical direction are
A form which is composed of an upper wire disposed on an upper portion of the seat back frame and a lower wire disposed on a lower portion of the seat back frame, and is disposed horizontally at a predetermined height from the lower end of the seat back frame. The lower end of the upper wire and the upper end of the lower wire are connected to the wire.

Therefore, an ideal supporting shape in the vertical direction of the seat back can be constituted by the upper and lower wires.

Moreover, since the wires arranged in the vertical direction of the seat back are divided into upper and lower wires, the upper wires have no effect on the elastic deformation of the lower wires. Therefore, similarly to the above-described prior art, the lower portion of the seat back is highly deformable.

In a preferred embodiment of the present invention, the thickness of the lower wire may be smaller than that of the upper wire, and the lower portion of the seat back may be more elastically deformed. Further, the form wire to which the lower end of the upper wire and the upper end of the lower wire are connected is set to 1/3 to 1/2 of the total height of the seat back frame from the lower end of the seat back frame, and the lower wire is used to operate the lumbar support device. May be mainly involved.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the seat back includes a seat back frame 40 formed in a rectangular shape, a seat back spring disposed on the seat back frame 40, and a seat elastically supported by the seat back spring. The back cover B includes a cover B and a cover C that covers the front surface of the seat back including the seat back B.

The seat back spring includes formed wires 10, 11, and 12 arranged in three stages of upper, middle, and lower portions in the horizontal direction, and wires 21, 22 arranged in the up and down direction. The wires 21 and 22 arranged in the vertical direction are the upper wire 21 and the lower wire 22.
The upper wire 21 disposed in the upper portion of the seat back is bent in a U-shape. Similarly, the lower wire 22 is also bent in a U-shape.

Formed wires 10, 11, and 12 arranged in three stages of upper, middle, and lower in the horizontal direction have a fish mouth portion at both ends thereof, and are elastically seat backed via the fish mouth portion. It is fastened to the side edge of the frame 40 (only one end of the hooded wire is shown in FIG. 1). On the other hand, the upper wire 21 is disposed between the upper and lower formed wires 10, 11 and the upper and lower ends thereof are connected to the upper and lower formed wires 10, 11 by clips 51 and 50, respectively. Locked. Similarly, the lower wire 22 is disposed between the formed wires 11 and 12 in the middle and lower positions, and the upper and lower ends thereof are formed by clips 52 and 53, respectively. Locked to 12.

In FIG. 1, the seat spring is illustrated for the left half of the seat back, but the seat spring is also provided for the right half.

Behind the lower wire 22, a lumbar support device A is provided. The lumbar support device A includes a lumbar plate 31, a torsion spring 30 for swingably holding the lumbar plate 31, a pin 33 for rotatably supporting the torsion spring 30, and one end of the torsion spring 30. A cam pin 35 engaged and having a cam surface on its outer periphery, a motor 34 operatively connected to the cam pin 35 via a worm gear mechanism, and a cam pin 35 which is attached to the seat back frame 40 and rotatably holds the cam pin 35;
It comprises a bracket 32 to which a pin 33 and a motor 34 are fixed.

When the motor 34 is rotated, the cam pin 35 is rotated around its axis. In response, the torsion spring 30, which is engaged with the cam surface formed on the outer periphery of the cam pin 35, rotates around the pin 33, and the lumbar plate 31 and the front-rear position are adjusted. Incidentally, it has the same configuration as the lumbar support device described in Japanese Patent Publication No. 54-16786.

The formed wire 11 at the middle position is provided at a position about 1/3 to 1/2 of the entire vertical width of the seat back frame 40 from the lower edge of the seat back frame 40, and the lumbar support device A is connected only to the lower wire 22. It is made to face.

In this embodiment configured as described above, the formed wire 11 at the middle position is divided into upper and lower parts with the upper and lower wires 21 and 22 disposed. Therefore, the upper and lower wires 21 and 22 can be individually elastically deformed. Moreover, since the biasing force of the other wires 22, 21 does not affect the elastic deformation of one of the wires 21, 22,
The upper and lower wires 21 and 22 can be easily elastically deformed.

In addition, since the wires 21 and 22 are arranged in the vertical direction, an ideal support shape in the seat back can be realized by the shape.

Further, the formed wire 11 at the middle position is provided at a position D which is about 1/3 to 1/2 of the entire vertical width of the seat back frame 40 from the lower end edge of the seat back frame 40, and the lumbar support device A is connected to the lower wire. It faces only 22. Therefore, the operation of the lumbar support device A is performed only against the urging force of the lower wire 22, and no operation force is required.

In a modified embodiment of the present invention, the diameter of the lower wire 22 is made smaller than that of the upper wire 21 as shown in FIG.
As a result, the lower portion of the seat back is more easily deformed.

When the formed wire 11 at the middle position is positioned at the same height as the lumbar plate 31, the operating force is slightly increased, but the seat back spring projects relatively sharply in a vertical U-shape. . Thus, the lumbar support force can be adjusted in a narrow width region in the vertical direction of the seat back.

〔The invention's effect〕

As shown in FIG. 3, as a means for constructing an ideal support shape in the vertical direction of the seat back, several foam heads are provided in the horizontal direction, and are supported by the seat back frame 111 at the fish mouth portions at both ends thereof. Wire 112a,
It is also conceivable to form them from 112b, 112c and several wires 113a, 113b arranged in the center of the seat back frame 111 over the entire area in the vertical direction.

However, the wires 113a and 113b
Is arranged over the whole area in the vertical direction at the center in the width direction, so that even if only the lower part of the seat back is deformed by the lumbar support device, the wires 113a, 113
The lumbar support device must be operated against the entire biasing force of b, and the operability is poor.

On the other hand, in the present invention, several wires arranged in the vertical direction are separated from the upper wire arranged in the upper portion of the seat back frame and the lower wire arranged in the lower portion of the seat back frame. The lower end of the upper wire and the upper end of the lower wire are connected to a formed wire horizontally arranged at a predetermined height from the lower end of the seat back frame.

Therefore, an ideal supporting shape in the vertical direction of the seat back can be constituted by the upper and lower wires.

Moreover, since the wires arranged in the vertical direction of the seat back are divided into upper and lower wires, the upper wires have no effect on the elastic deformation of the lower wires. Accordingly, the lower portion of the seat back is highly deformable.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a perspective view showing a modified embodiment of the present invention, and FIG. 3 is a perspective view showing another example for solving the problems of the present invention. . 10,11,12 …… Formed wire, 21 …… Upper wire, 22 …… Lower wire.

Claims (1)

(57) [Claims] 1. A seat back frame for an automobile seat, several formed wires arranged in a horizontal direction and supported by the seat back frame at fish mouth portions at both ends thereof, And a plurality of wires arranged in the up-down direction, an upper wire arranged in the upper portion of the seat back frame, and a plurality of wires arranged in the lower portion of the seat back frame. The upper wire is divided into a lower wire having a diameter smaller than that of the upper wire, and a formed wire horizontally disposed at a predetermined height from the lower end of the seat back frame. The upper end of the wire is joined, and the upper and lower wires can be elastically deformed independently, and the lower part of the seat back is more elastically deformable than the upper part Unisa sheet back spring structure of an automobile seat.