JPH0542782Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is equipped with a lumbar support device in which a lumbar plate is provided at the tip of a lumbar rod whose position can be adjusted by swinging. The present invention relates to a seat bag made of integrally foamed foam material.

``Prior Art'' Recently, there are seat backs in which the pad is integrally foam-molded with a lumbar support device built in.

In conventional seat bags formed by integral foam molding, the lumbar support device adjusts the lumbar rod and the lumbar plate by displacing them against the elastic force of the foam.

``Problems to be solved by the invention'' However, with such conventional techniques, the elastic force of the foam acts as resistance, requiring a large operating force and limiting the displacement of the lumbar rod and lumbar plate for adjustment. This resulted in a lumbar support device that was uncomfortable to use and a seat back that was uncomfortable to sit on.

The present invention was developed in light of these conventional problems, and the purpose of the present invention is to provide a seat back that is made of integral foam, but which does not create resistance when adjusting the lumbar support device. It is said that

``Means for Solving the Problems'' The gist of the present invention for achieving the above object is to provide a lumbar support device including a lumbar plate provided at the tip of a lumbar rod whose position can be adjusted by swinging. A seat bag in which a foam material that becomes a pad is integrally foam-molded with a support device built in, is characterized in that a gap is provided in the pad material on the back side of the portion corresponding to the lumbar rod and lumbar plate of the lumbar support device. exists in

``Operation'' When integrally foaming molding the seat back pad, place the lumbar support device inside the mold, attach inserts to the rear part of the lumbar rod and lumbar plate of the lumbar support device, and then insert the mold into the mold. Put the raw material liquid of the foaming material inside and foam it.

Even if foaming progresses during integral foam molding, the foam material will not wrap around the nested part, and integral foaming will continue as is. After foaming is completed, the insert is removed and a void is formed in the pad material on the back side of the part corresponding to the lumbar rod and lumbar plate.

The lumbar rod and lumbar plate of the lumbar support device have a gap formed behind them and a thin pad, so that they swing with light resistance when adjusting their position. The lumbar plate at the tip of the lumbar rod is adjusted to apply just the right amount of pressure to the lumbar region of the seated person, providing a comfortable sitting experience.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

1 and 2 show an embodiment of the present invention.

The seat bag 10 supports a cushion body 11 from the inside with an internal frame 20, and the cushion body 11 has a pad 12 made of a foam material attached to the outer skin 1.
It is covered with 3.

A rear opening 14 is opened in the cushion body 11, and the rear opening 14 is closed with a board 14a.

Although not shown in the figure, the frame 20 is shaped like a frame, and is made up of a frame plate 22 fixed to a pipe frame 21. A zigzag spring 23 is inserted between the vertical members 21a, 21a of the pipe frame 21 located on the left and right sides of the seat bag 10. , 23... are stretched.

A lumbar support device 30 is built into the seat bag 10.

The seat back 10 includes a lumbar support device 3
The foam material that becomes the pad 12 is integrally foam-molded with 0 incorporated therein.

The lumbar support device 30 has a lumbar rod 31 installed between the left and right frame plates 22, 22, and a lumbar plate 35 is attached to the swinging end.

The lumbar rod 31 has horizontal pivot parts 32, 32.
is loosely fitted into the left and right frame plates 22, 22, and a horizontal portion 34 is formed at the tip of the lower end of an arm 33 that hangs downward from the horizontal pivot portions 32, 32, and the horizontal portion 34 is a free end on which a lumbar plate 35 is attached. is doing. The lumbar plate 35 is arranged to be located behind the lumbar vertebrae of the seated person.

An adjustment member 36 is disposed facing the intermediate portion of the arm 33 of the lumbar rod 31.

A shaft portion 37 of the adjustment member 36 is pivotally supported by the frame plate 22, a cam plate 38 is fixed to the tip of the shaft portion 37, and a handle 39 for adjustment operation is fixed to the base end of the shaft portion 37.

The cam plate 38 is connected to the arm 33 of the lumbar rod 31.
The receiving bracket 3 is extended to extend inward from the
The lumbar rod 31 swings and the position of the lumbar plate 35 can be adjusted by changing the amount by which the receiving bracket 33a is pushed depending on the rotational position.

Lumbar rod 3 of lumbar support device 30
A substantially U-shaped gap 15 is formed in the cushion body 11, surrounding the lumbar plate 1 and the rear of the lumbar plate 35, and along the side edge and lower edge of the rear opening 14. The void 15 is formed by inserting a substantially U-shaped insert having the same shape as the void 15 during foam molding.

Since the gap 15 is formed, the arm 33 of the lumbar rod 31 of the lumbar support device 30
and behind the lumbar plate 35, the foam layer is thinner.

Next, the action will be explained.

When the pad 12 of the seat back 10 is integrally foam-molded, it is placed in a mold with the lumbar support device 30 built-in, and the raw material liquid of the foaming material is added and foamed. A substantially U-shaped insert is previously attached to surround the lumbar rod 31 of the lumbar support device 30 and the rear of the lumbar plate 35, and along the side edge and lower edge of the rear opening 14.

Next, the raw material liquid is poured from a part of the rear opening 14 and foamed integrally with the lumbar support device 30 built-in. The foamed material enters the recess and fills the space, but since the approximately U-shaped insert fills the space, the foamed material does not go around into the void 15.

When the insert is removed after foaming is completed and the pad 12 is formed, a void 15 is formed in its place.

The operation of the lumbar support device 30 is as follows.

If the lumbar plate 35 appropriately hits the lumbar vertebrae of the seated person, the seat will be comfortable to sit on. To adjust the lower limit of the lumbar plate 35, use the adjustment member 3
6 and rotate it to change the degree of contact between the cam plate 38 and the receiving bracket 33a of the arm 33 of the lumbar rod 31.

That is, since the cam plate 38 has an irregular polygonal shape, the arm 33 is displaced back and forth depending on the side it touches, and the lumbar rod 31 swings about the horizontal pivot portion 32 and is attached to the horizontal portion 34. The lumbar plate 35 moves back and forth to change the degree of contact with the seated person. If the handle 39 is released at an appropriate position, the adjustment member 36 will stop at that position, and the lumbar rod 3
1. The lumbar plate 35 also maintains the position.

There is a gap 15 behind the arm 33 of the lumbar rod 31 and the lumbar plate 35, and the layer of the pad 12 of the cushion body 11 is made thinner.
The lumbar rod 31 swings with low resistance during position adjustment, and the lumbar plate 35 is also slightly displaced. The lumbar plate 35 applies moderate pressure to the vicinity of the lumbar vertebrae of the seated person, thereby providing comfortable sitting comfort.

``Effects of the invention'' According to the seat bag according to the invention, a gap is formed behind the lumbar rod and lumbar plate of the lumbar support device, and the pad layer is thinned, so that the lumbar rod swings or the lumbar plate moves during adjustment. The elastic resistance of the foam during displacement is low, and it can be easily adjusted with a small operating force, resulting in a lumbar support device that is comfortable to use, and a seat back that is comfortable to sit on.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIG. 1 is a perspective view of a seat bag with some parts omitted;
FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a sectional view taken along the line of FIG. 10...Seat bag, 11...Cushion body, 12...Pad, 13...Skin, 15...Gap, 20...Frame, 23...Zigzag spring,
30...Lumber support device, 31...Lumber rod, 32...Horizontal pivot portion, 35...Lumber plate.

Claims (1)

[Claims for Utility Model Registration] A lumbar support device is provided with a lumbar plate at the tip of a lumbar rod whose position can be adjusted by swinging, and the pad is formed by integral foam molding with the lumbar support device built-in. What is claimed is: 1. A seat back comprising: a space provided in a pad material on the back side of a portion corresponding to a lumbar rod and a lumbar plate of a lumbar support device;