Beds – Support for users body or part thereof – Removable support specially adapted for seating
Patent
1997-03-21
1998-12-22
Grosz, Alexander
Beds
Support for users body or part thereof
Removable support specially adapted for seating
5922, 29745227, 29745261, 297DIG6, 264 464, 29 911, 156 78, B68G 700
Patent
active
058506454
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a seat such as a seat for an automobile, a forklift truck, a tractor and the like or a chair used in an office and the like. In particular, the present invention relates to a seat wherein a surface material of the seat is integral with a cushioning body thereof.
BACKGROUND OF THE ART
FIG. 9 shows a surface material 41 of a conventional seat of an automobile and a cushioning body 47 thereof. The surface material 41 comprises a main portion 44 of the seat, side portions 42 thereof and a circumferential portion 43 around the main portion 44, and those portions are cut from a flat material, respectively. The side portions 42 and the circumferential portion 43 are stitched together and the circumferential portion 43 and the main portion 44 are stitched together. The surface material 41 is formed to a shape corresponding to a surface of the seat having a three-dimensional shape.
Then, the cushioning body 47 has the same shape as the shape of the surface material and is covered with the surface material. A wire 48 is provided in the cushioning body 47 and a wire 46 is provided in a cloth 45 stitched between the main portion 44 and the circumferential portion 43, and the seat is structured by connecting the wire 48 and the wire 46 through hog rings so that the surface material cannot be displaced above the cushioning body.
It takes a long time to cut into each piece of the surface material as mentioned above. Recently, the shape of seats has become complicated. Thus, in order to structure a seat having such a complicated shape, a sheet material for the surface material must be cut in pieces having several shapes. Also, when the surface material 41 is connected to the cushioning body 47 through hog rings, this causes an overload of work for workers in an assembly work shop carrying out a mass production in continuous assembly line therefor.
When a person sits on the seat mentioned above, the surface material is expanded and tensioned by the weight of the person. A fiber material used for the surface material is not typically sufficiently elastic that the seat cannot be restored to an original state thereof when the weight of the person is released from the seat. As a result, the surface material is crumpled, and this causes a problem in that the appearance of the seat is worse.
In order to address this problem, as shown in FIG. 9, a surface of a flat material 49 made of a polyurethane foam is adhered on a back surface of the surface material and a thin fiber material 50 such as nylon half or a nonwoven fabric is adhered on another surface of the base material 49 to enhance the elasticity of the surface material.
However, it takes a long time to make such a surface material and the cost thereof becomes expensive.
In addition, a seat such as a seat for an automobile or a chair used in an office or for furniture (hereafter simply cased "a seat") is required to be elastic to sit comfortably and is also required to have an adequate hardness to support the weight of a person who sits thereon.
It is desirable that a circumferential part around the main portion of the seat should be hard to improve maintenance of the shape of the seat, to improve the appearance of the seat and to improve the feel to a person who sits on the seat.
However, it is difficult to control locally and easily the hardness of the seat by the structure and the manufacturing process of the aforementioned seat in the art.
Therefore, an object of the present invention is to provide a seat and a method for manufacturing the seat wherein a surface material of the seat is integrated with a cushioning body thereof.
Another object of the present invention is to provide a seat having integrated layers and a method for manufacturing the seat wherein a lower layer is harder than an upper layer, the upper layer being in contact with a person, the lower layer supporting the weight of the person.
Another object of the present invention is to provide a seat having integrated layers and a method for manufacturi
REFERENCES:
patent: 4190697 (1980-02-01), Ahrens
patent: 4755411 (1988-07-01), Wing et al.
patent: 4837881 (1989-06-01), Kondo et al.
patent: 5000515 (1991-03-01), Deview
patent: 5105491 (1992-04-01), Yoshiyuki et al.
patent: 5283918 (1994-02-01), Weingartner et al.
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