JPS6010450Y2 - Four-layer futon material - Google Patents

Description

[Detailed description of the invention] The present invention relates to a futon with a four-layer structure, and its purpose is to prevent deformation or sagging over a long period of time, and to avoid adverse effects on the human body when sleeping. There are no healthy bedding materials available.

Traditional futons have often been made from cushioning materials.

However, this type of futon tends to cause the buttocks and back to slump, resulting in the back vertebrae becoming curved, which is likely to cause health problems.

For this reason, a futon with a three-layer structure has recently been proposed (Tokuko Kosho 5).
3-824 inches), but it is intended to straighten the back vertebrae by having an intermediate layer with appropriate hardness, and is expected to have an acupressure effect due to the corrugated intermediate layer.

However, in the case of this three-layer futon, the substrate (lower layer) is made of elastic synthetic resin foam, so when a load is applied to the middle layer, the corrugated shape is pushed and expands and deforms. However, when used for a long period of time, the waveform spreads and becomes stretched, and the effect of acupressure is lost, and the futon itself gradually becomes thinner due to wear and tear, and the beauty of the bedding is also impaired. .

Further, when a load is applied, the elastic foam of the lower layer gets into the corrugated recesses on the lower surface of the intermediate layer, resulting in a disadvantage that the cushioning effect is weakened.

The present invention consists of a substrate with a hard plastic sheet or a plastic foam sheet adhered to the surface of an open-cell plastic sheet, the top surface of which has a wavy shape, and the back surface corresponding to the top of the wavy shape with a concave arc-shaped cross section. A corrugated sheet of plastic foam of suitable hardness is glued to form the part.
Along the corrugation of the upper surface of the corrugated sheet, an open-cell plastic foam having a large number of uneven parts on its surface and a surface having a corrugated shape corresponding to the corrugated shape of the upper surface of the corrugated sheet is placed between the back surface of the foam and the upper surface of the corrugated sheet. A futon material consisting of four layers bonded together so that the respective corrugations on the top surface of the corrugated sheet fit together, and its purpose is to interpose a hard plastic sheet or foam sheet on the bottom surface of the corrugated sheet. By doing so, we aim to prevent the corrugated sheet made of plastic foam from sagging, provide sufficient adhesive strength between each layer, prevent long-term deformation of the futon, and maintain the acupressure effect and cushioning effect over a long period of time. It is something to do.

To explain the present invention with reference to the drawings, the first surface layer is composed of a soft open-cell plastic foam such as urethane foam or polyolefin open-cell foam, and the surface has many protrusions approximately the size of a thumb. A recess is formed,
Further, the back surface thereof is formed in a waveform shape corresponding to the waveform shape of the upper surface of the second layer corrugated plate 2 laminated thereunder.

The second layer corrugated sheet 2 is a plastic foam corrugated sheet made of a hard material such as polyethylene foam. A concave portion 7 having a circular arc shape is formed, and the back surface corresponding to the wavy concave portion is a flat portion 8.

and the first layer of open-cell plastic foam 1.
The back side of the open-cell plastic foam 1 is bonded together with an adhesive along the waveform on the top surface of the corrugated sheet 2 so that the corrugation on the back side matches the waveform on the top surface of the second layer corrugated sheet 2. ing.

The flat part 8 on the back surface of the corrugated sheet 2 is adhered to a third layer sheet 3, and the third layer sheet 3 is a plastic sheet or a plastic foam sheet with the same or slightly higher hardness than the corrugated sheet 2. is suitable.

A fourth layer sheet 4, which is thicker than the third layer sheet 3, is adhered to the lower surface of the third layer sheet 3.

This sheet 4, like the first surface layer, is made of open-cell plastic foam.

9 is a covering material that covers the bedding material such as cloth.

The four-layer futon material of the present invention has the above-mentioned structure, in which the first layer of open cell plastic foam 1 and the second layer of corrugated sheet 2 are fitted with their respective corrugations. Since the flat part 8 on the lower surface of the second layer of corrugated foam is firmly adhered to the hard plastic sheet or plastic foam sheet 3, there is no possibility of peeling or lateral displacement. Even when a point is subjected to a load due to body weight, the waveform does not expand or collapse and deform, and therefore maintains its regular shape, so it does not spoil the aesthetic appearance. Due to the presence of a cavity formed by three layers, i.e., a hard plastic sheet or a plastic foam sheet, each corrugated member has a bridge structure, which provides a spring-like element to the waist and thus maintains adequate cushioning over a long period of time. The acupressure effect will not decrease.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a futon using the futon material of the present invention, and FIG. 2 is a sectional view of the futon material of the present invention. 1.4...Open cell plastic foam, 2
...Plastic foam corrugated plate, 3...
Plastic sheet or plastic foam sheet.

Claims (1)

[Scope of utility model registration request] On the surface of the open-cell plastic foam sheet 4, a plastic sheet with a higher hardness or a plastic foam sheet 3 is adhered to the surface of the substrate, the upper surface of which has a wavy shape, and the back surface corresponding to the top of the wavy shape has a cross section. The lower surface of a corrugated sheet 2 made of plastic foam having a suitable hardness and having a concave portion 7 having an arcuate shape is adhered, and a large number of uneven portions are formed on the surface along the waveform of the upper surface of the corrugated plastic foam sheet 2. The back surface of an open-cell plastic foam 1 having a back surface having a waveform shape corresponding to the waveform shape on the top surface of the corrugated sheet 2 is formed so that the corrugations on the back surface of the foam 1 and the corrugations on the top surface of the corrugated sheet 2 are different from each other. A futon material with a four-layer structure that is bonded to fit.