JPH0130113Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coil spring for a seat, that is, a coil spring built into the seat.

Conventionally, seats, beds, etc. have been made of cushioning material 1 such as urethane foam, as shown in Figures 1 to 3.
, a coil spring 3 housed in a hollow part 2 provided in this cushioning material 1 , a fixing plate 4 holding this coil spring 3 , and a coil spring 3 held by the spring 3 and inside the cushioning material 1 . It is composed of a housed pressure receiving plate 5 and the like. The coil spring 3 holds the pressure receiving plate 5 and elastically holds the cushioning material 1. For example, the coil spring 3 is curled on a cut-and-raised piece 6 provided on the pressure receiving plate 5, and this curled portion allows the spring 3 to It is integrated in such a way as to hold the parts.

However, with such a configuration, a part of the cushioning material 1 gets caught in the gap 7 side of the spring 3, which not only impairs the elastic force of the spring 3 but also causes a part of the cushioning material 1 to become stuck. This biting causes the spring to tear, shortening the life of the cushioning material 1 and shortening the lifespan of the cushioning material 1. If this sheet is used, for example, as a vehicle seat, the spring 3 is easily bent in the above-mentioned lateral swaying direction, making it impossible to prevent the occupant from lateral swaying. In other words, the holding force in the lateral vibration direction was small.

The purpose of the present invention is to house a coil spring in a heat-shrinkable cylinder that has elasticity and whose upper end tongue piece is inserted into a slit formed in advance in a pressure receiving plate, and to heat this cylinder. The above-mentioned drawbacks are eliminated by integrating the coil spring with the coil spring, and will be explained in detail below using examples.

4 and 5 are cross-sectional views showing one embodiment of the coil spring for a seat according to the present invention, and in the figure, the spring 20 built into the seat has a coil shape, and the diameter on the center side is small. The spring 20 is housed in a cylinder 22 whose upper end is attached to the pressure receiving plate 5. The cylindrical body 22 is made of stretchable and heat-shrinkable synthetic resin, and after the spring 20 is housed in the cylindrical body 22, the cylindrical body 22 is placed in a heating furnace, or heated with hot air or hot water. The cylinder body 22 can be integrated with the spring 20 by heating the cylinder body 22 and shrinking the cylinder body 22 as shown in FIG. That is, since the cylinder body 22 fits into the spring 20 after its diameter becomes smaller due to heat contraction, the cylinder body 2
2 has a bellows shape and has elasticity in the axial direction.

Incidentally, as a method of integrating the spring 20 and the cylindrical body 22 and the cylindrical body 22 and the pressure receiving plate 5, as shown in FIG. The tongue piece 28 provided at the upper end of the cylindrical body 22 is inserted into the cylindrical body 22. After the spring 20 is housed in the cylindrical body 22, the cylindrical body 22 is contracted by applying heat and contracting. By thermally deforming the tongue piece 22, the cylinder body 22, the spring 20, and the pressure receiving plate 5 can be integrated at the same time, and such a device M can be incorporated inside the cushioning material 1 as shown in FIG. The sheet can be configured by

According to the coil spring for a seat according to the present invention, the coil spring is housed in a heat-shrinkable cylindrical body that has elasticity and whose upper tongue piece is inserted into a slit formed in advance in a pressure receiving plate.
Since this cylindrical body is heated and integrated with the coil spring, the elastic force of the spring is not impaired due to vertical expansion and contraction of the cylindrical body, and the cylindrical body 22 forms a spring and a seat. Eliminates the conventional problem of being interposed between the cushioning material and the spring, causing part of the cushioning material to be caught by the spring, resulting in loss of spring elasticity and part of the cushioning material being torn off. Moreover, even if force is applied in the lateral direction, the spring is integrated with the heat-shrinkable cylinder attached to the pressure plate and does not deform much in the lateral direction, so the lateral movement of the seat itself is reduced. This has the advantage of being able to prevent displacement, prevent lateral shaking, and facilitate integration with the cushioning material that constitutes the seat.

[Brief explanation of the drawing]

1 to 3 are simplified configuration diagrams showing an example of a conventional coil spring for a seat, and FIGS. 4 and 5 are a sectional view and a perspective view showing an embodiment of a coil spring for a seat according to the present invention. . 1... Cushioning material, 5... Pressure receiving plate, 20... Coil spring, 22... Cylindrical body, 27... Slit,
28... Tongue piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A coil spring that has a built-in pressure receiving plate that extends in the horizontal direction and is built into a cushioning material that constitutes a seat, which is stretchable and has a tongue piece at the upper end formed in advance on the pressure receiving plate. A coil spring for a seat, characterized in that the coil spring is housed in a heat-shrinkable cylindrical body inserted into a slit, and the cylindrical body is heated to be integrated into the coil spring.