JPS6144483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cushion body for a seat that has reinforced side portions and has improved support performance for a seated person.

2. Description of the Related Art Automotive seats are provided with cushion bodies having side portions that protrude beyond a main portion in order to reliably support a seated person by preventing the seating position from shifting due to the rocking of the vehicle body. Conventionally, this type of cushion body has a pad integrally formed from a synthetic resin foam such as urethane, which has the main part and side parts, and is embedded in the pad to maintain and reinforce the shape of the side part. It has an upper frame line, a lower frame line, a plurality of spring lines, etc. The above upper frame line and lower frame line refer to the front and back surfaces of the side part (the upper and lower surfaces of the seat section, and the front and rear surfaces of the backrest section).
The spring line extends along the main part, and the middle part of the spring line extends along the main part, and the spring line extends along the lower frame line.
Both end portions, which are wound more than once and extend, are wound and locked around the upper frame line.

In the conventional cushion body constructed as described above, the side parts are made of the same relatively soft material as the main part, so even if the above-mentioned frame lines and spring wires are provided, sufficient support performance cannot be achieved. This was not achieved, and improvements were requested.

The present invention has been made based on the above-mentioned circumstances, and its object is to provide a cushion body for a seat that has excellent support performance and is particularly suitable for use in automobiles.

Hereinafter, the present invention will be described with reference to an illustrated embodiment. In the drawings, the pad 1 integrally includes a main part 2 disposed at the center and side parts 3 disposed at the edges and whose front end protrudes beyond the main part. A spring structure 4 is embedded inside the pad portion 1 . This spring structure 4 has an upper frame line 5 extending along the front side of the side part 3, a lower frame line 6 extending along the back side of the side part 3, and the upper frame line 5 and the lower frame line. 6 and a plurality of spring wires 7 suspended therebetween. This spring wire 7 has an intermediate portion disposed in the main portion, and both end portions that extend by being wound around the lower frame line 6 one or more times are wound around the upper frame line 5 or by other appropriate means. It is locked. The upper frame line 5 and the lower frame line 6 are wound around a core wire made of, for example, a hard steel wire, and are wound around the outer periphery of the core wire to allow relative rotation with the spring wire 7, and also allow for axial displacement and It is equipped with a paper cord to suppress the generation of friction noise. Further, the spring wire 7 is formed of, for example, an oil-tempered spring steel wire.

A plurality of notches 8 (the figure shows one each) are arranged at intervals on both sides of the pad 1. This notch 8 opens laterally and, if necessary, toward the back, and is formed so that the lower frame line 6 is spaced apart from the inner wall surface and exposed inside. One end of a tension spring 10 such as a tension coil spring stretched between the lower frame line 6 and the seat frame 9 is located in the notch 8 and is configured to be locked to the lower frame line 6. has been done.

When manufacturing a cushion body configured as described above, the preformed spring structure 4 is placed at a predetermined position in a foam molding mold, and molded parts corresponding to the main part 2 and side part 3 are formed. Different foamed synthetic resin materials are injected into each part of the mold.
Foam the layers simultaneously. At this time, the foamed synthetic resin material is formulated so that the side portions have a predetermined hardness higher than the main portion after molding.

In the cushion body of the present invention configured as described above, the spring structure 4 is embedded inside the pad 1, and the upper frame line 5 is embedded inside the side portion 3.
Since the end of the spring wire 7 is embedded integrally and the side part 3 is formed harder than the main part 2, the supporting performance for the seated person is improved compared to the conventional type in which both of these parts are soft. When installed in a seat of an automobile, it is possible to reliably support a seated person and provide a good ride comfort regardless of the rocking of the vehicle body. Further, by providing the cutout portion 8, the tension spring 10 can be easily and easily assembled, and the labor required for attaching the cushion body can be reduced and efficiency can be improved.

As described above, in the present invention, the side part of the pad in which the upper frame line and the end of the spring wire of the spring structure are embedded is formed to be harder than the main part, so that this hard side part cooperates with the spring structure. By doing so, it is possible to provide a seat cushion body that exhibits excellent support performance against rocking motion and is particularly suitable for use in automobiles.

In addition, since the plurality of notches located on both sides of the side part and partially exposing the lower frame line are opened at intervals, the end of the tension spring that is stretched between the seat frame and can be easily locked to the lower frame line in the notch, and the work of attaching the cushion body to the seat frame can be done simply and easily. Since the notch is provided only in a part of the side part, it does not substantially impair the hardness of the side part, which is formed by foaming harder than the main part, and improves the supporting performance of the side part. You can make the most of it.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a perspective view illustrating a spring structure. 1... Pad, 2... Main part, 3... Side part, 4... Spring component, 5... Upper frame line, 6... Lower frame line, 7... Spring line, 8... Notch part, 9...Seat frame, 10...Coil spring (tension spring).

Claims (1)

[Claims] 1. A pad that is integrally foam-molded from a foamed synthetic resin material and has a main part arranged in the center and side parts arranged at the edges, and a pad that is embedded within this pad and along the front and back of the side parts an upper frame line and a lower frame line extending from each other, and each end portion which is embedded in the pad and whose middle part is disposed in the main part, and which extends by winding the lower frame line one or more times. and a plurality of spring wires fixed to the upper frame line, the side part is foam-molded to be harder than the main part, and a plurality of notches are located on both sides of the side part and spaced apart from each other. The other end of the tension spring whose one end side is locked to the seat frame is inserted into the notch, and the lower frame line is exposed inside the notch. A cushion body for a seat, characterized in that the end portion of the tension spring is locked at the exposed portion of the wire.