JPH06143306A - Manufacture of seat cushion - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the manufacturing process and reduce the manufacturing cost in the manufacturing method of the seat cushion. [Structure] In a method of manufacturing a seat cushion in which a cushioning pad material is covered with a frame and a skin material,
Having a pre-deformation outer shape that fills the space defined by the frame and the skin material, and mounting a shape memory urethane pad material that has been deformed to an outer shape slightly smaller than this space into the space,
After that, the pad material is heated to a temperature equal to or higher than a predetermined shape recovery temperature of the shape memory urethane to restore the outer shape of the pad material to the original shape before the deformation, and then the temperature of the pad material is made lower than the shape recovery temperature. A method for manufacturing a seat cushion, comprising:

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion manufacturing method, and more particularly to a seat cushion manufacturing method having a simplified manufacturing process.

[0002]

2. Description of the Related Art In conventional seat cushions for vehicles and the like, urethane pad materials are used. This urethane pad material is formed by a foaming mold. FIG. 2 shows the entire hud material of this conventional example, and FIG. 3 shows the AA sectional structure of FIG. 2 and 3, the urethane pad material 51 molded by a specific foaming mold is molded by the foaming mold 6. The foaming mold 6 comprises an upper mold 61 and a lower mold 62. The dimension of the urethane pad material 51 molded by the foaming mold 6 matches the size of the space defined by the frame 52 and the skin material 53 of the seat cushion 5 shown in FIG.

[0003]

However, since it is not easy to bring the urethane pad material 51 into close contact with the inside of the frame 52 of the seat cushion 5 and the skin material 53, the urethane pad material 51 and the frame 52 of the seat cushion 5 are not easily attached. It has been complicated to prevent a gap from being formed between the sheet and the skin material 53. Therefore, the work of mounting the urethane pad material 51 in the space is troublesome. Therefore, the object of the present invention is to eliminate the above-mentioned drawbacks,
It is an object of the present invention to provide a method for manufacturing a seat cushion that can simplify the manufacturing process and reduce the manufacturing cost.

[0004]

In order to solve the above-mentioned problems, the structure of the present invention is a method of manufacturing a seat cushion in which a cushioning pad material is covered with a frame and a skin material. The shape memory urethane pad material, which has an undeformed outer shape that fills the divided space and is deformed to an outer shape slightly smaller than this space, is mounted in the space, and then the shape memory urethane pad material is formed into a predetermined shape. Heating above the recovery temperature to return the outer shape of the shape memory urethane pad material to the original shape before the deformation, and then lowering the temperature of the shape memory urethane pad material below the shape recovery temperature.

[0005]

In the method of manufacturing a seat cushion having the above structure, the shape memory urethane has a shape before deformation that fills a space defined by the frame of the seat cushion and a skin material, and is deformed into an outer shape slightly smaller than this space. The pad material is heated to a predetermined shape recovery temperature or higher to restore the shape of the shape memory urethane pad material to the shape before the deformation, and then the temperature of the shape memory urethane pad material is lower than the shape recovery temperature. Therefore, the shape memory urethane pad material can be easily brought into close contact with the space.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing a method of manufacturing a sheet cushion according to the present invention. In FIG. 1, a cushioning urethane pad material 4 is covered by a frame 2 and a skin material 3 of a seat cushion 1. First, the frame 2
The shape memory urethane pad material 4 having an outer shape before deformation that fills the space defined by the skin material 3 and deformed to have an outer shape slightly smaller than this space is mounted in the space. Then, the pad material 4 is heated to a temperature equal to or higher than a predetermined shape recovery temperature of the shape memory urethane. A curve 42 shows a state in which heat is transmitted from the heat source to the pad material 4. By this heating, the outer shape of the pad material 4 is returned to the outer shape before the deformation (arrow 4
Reference numeral 1 indicates the returning direction of the outer shape of the pad member 4. ), The pad material 4 is brought into close contact with the inside of the frame 2 and the skin material 3. After that, the temperature of the pad material 4 is made lower than the shape recovery temperature, so that the shape of the pad material 4 does not change. Next, the skin material 3 is arranged so as to cover the pad material 4, and the strip-shaped synthetic resin body 31 attached to the end portion of the skin material 3 has the U-shaped cross-section hook portion 21 formed at the end portion of the frame 2. The skin material 3 is fixed to the frame 2 by being locked to. In this way, the assembly of the seat cushion 1 is completed.

[0007]

As described in detail above, according to the seat cushion manufacturing method of the present invention, the seat cushion manufacturing process can be significantly simplified and the manufacturing cost thereof can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a conventional pad material.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view of a conventional seat cushion.

[Explanation of symbols]

 1 Seat Cushion 2 Frame 3 Skin Material 4 Shape Memory Urethane Pad Material 41 Arrow 42 Curve

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Claims (1)

[Claims] 1. A method of manufacturing a seat cushion, wherein a cushioning pad material is covered by a frame and a skin material, the seat cushion having an undeformed outer shape that fills a space defined by the frame and the skin material. A shape memory urethane pad material deformed to a slightly smaller outer shape is mounted in the space, and then the pad material is heated to a temperature equal to or higher than a predetermined shape recovery temperature of the shape memory urethane to deform the outer shape of the pad material. A method for manufacturing a seat cushion, comprising returning to a previous outer shape, and then lowering the temperature of the pad material below the shape recovery temperature.