JPS629322B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat cushion body mainly used as a cushion body for covering the backrest of a vehicle seat such as an automobile seat.

As shown in FIG. 12, a conventional cushion body for a seat of this type has a seating surface portion 12 made of an elastic material such as polyurethane foam that covers the surface of the support frame, and extends backward from at least both side edges of the support frame side surface and the support frame. Normally, a reinforcing cloth 16 such as cheesecloth is attached to the back side of the cushion body 11 which is formed by integrally bending both sleeve parts 13, 13 that cover part or all of the back side. Since the surface is flat, the back side of the seat part 12 is brought into contact with the surface of the support frame A, and both sleeve parts 13 are bent so that they come into contact with the back side of the support frame A. sleeve part 13,
The end edge of 13 is fixed to a spring rod or the like stretched over the support frame A using a stopper 17 such as a C-ring.
Next, when the entire seat is covered with a seat cover, the cushion body 11 is crushed at the bent portion C of both sleeve portions 13, 13 corresponding to the boundary between the side surface of the support frame and the back surface of the support frame, and the cushion body 11 is crushed to form a corner portion. The surface of the seat cover is arcuate, and there is a problem in that the corner portion of the back side of the seat covered with the seat cover cannot be finished into a sharp shape. Therefore, in 1973,
As shown in Publication No. 85309, a cushion body for a seat has been proposed in which the middle of both sleeve parts is bent inward and the back part parallel to the seat part continues to the side part. Such a cushion body for a seat requires a complicated mold to manufacture, and also has the disadvantage that it requires a complicated mold release operation after foam molding, and cannot be provided at a low price.

The present invention was completed with the aim of providing a cushion body for a seat that solves the above-mentioned problems, and the present invention will be described in detail below with reference to the illustrated embodiments.

1 to 10, reference numeral 1 denotes a cushion body for a backrest made of an elastic material such as polyurethane foam, and the cushion body 1 is on both sides of a seat surface portion 2 that covers the surface of the support frame of the backrest of a front seat of an automobile. The basic structure is almost the same as the conventional seat cushion body of this type, with both sleeve parts 3, 3 being integrally bent from the edge toward the back and reinforcing fabric 6 attached to the entire back surface. , on the outer surfaces of both sleeve portions 3, 3 covering the portion from the side surface of the support frame to the back surface of the support frame, at an intermediate position on the outer surface of the sleeve portions 3, 3, that is, at a portion corresponding to the boundary between the side surface of the support frame and the back surface of the support frame. In the width direction, raised bending band portions 4, 4 having a chevron-shaped cross section are provided. In the embodiment shown in FIGS. 4 to 6, the cushion body 1 is bent backward from both side edges of the seat portion 2, and the outer surfaces thereof are flat. Both sleeve parts 3, 3 are provided with bending aid notches 5 corresponding to the raised bending band parts 4, 4 protruding from the outer surfaces of both sleeve parts 3, 3. This makes it easy to bend it inward and attach it to the support frame. In the second embodiment shown in FIG. 4, this bending assisting notch 5 is formed by a reinforcing cloth 6 extending from the inner surface of both sleeve portions 3, 3 to the top of the folding raised band portions 4, 4. In the third embodiment shown in FIG. 5, the slit is formed only in the reinforcing fabric 6 on the back side of each sleeve part 3. On the other hand, in the fourth embodiment shown in FIG. 6, a portion of the inner surface of each sleeve portion 3 corresponding to the bending raised band portion 4 is formed into a groove portion having a V-shaped or U-shaped cross section. The notch 5 is used to assist bending. In addition, there are other means to facilitate the work of bending both sleeve portions 3, 3 inward from the intermediate position and attaching them to the support frame, and in the fifth embodiment shown in FIG. A wire is inserted into the flesh of both sleeve parts 3, 3 of the cushion body 1, corresponding to the raised bending band parts 4, 4, instead of the above-mentioned bending assisting notch 5, or in combination with the bending assisting notch 5. A narrow rod body 5' such as
In the ninth embodiment shown in FIG.
Assume that a plate-like member 1' that is harder than other parts of the cushion body 1 is attached to the inner surface of the portion extending from the inner surface of the seat surface part 2 to the intermediate position between the sleeve parts 3, 3, and that the plate-like member 1' is The edge 1'' makes it easy to bend both sleeve parts 3, 3, and the plate member 1' protects the inner surface of the cushion body 1. In this embodiment, the cushion body 1 is made of polyurethane foam. At the time of molding, a slab urethane is prepared in advance in the mold and integrally molded to form the plate-shaped member 1'.
In the eighth embodiment, the raised bending band parts 4, 4 are provided with stepped angles on both sleeve parts 3, 3, each of which is formed into a stepped part, and the stepped part is shown in the seventh embodiment. As shown in FIG. The stepped portion may be formed by forming a thin wall portion formed by recessing the outer surface of the portions 3, 3 at an intermediate position.

As shown in FIGS. 2 and 3, this structure has a cushion body 1 on the surface of the support frame A.
The back side of the seat part 2 is brought into contact with both sleeve parts 3, 3.
is bent so as to come into contact with the back side of the support frame A, and the edges of both sleeve parts 3, 3 are fixed to a spring rod or the like stretched over the support frame A using a stopper 7 such as a C-ring, Next, when the entire seat is covered with a seat cover 8 to form a seat, the cushion body 1 is formed by integrally bending both sleeve portions 3 toward the back from at least both side edges of the seat portion 2. Similar to the cushion body for the seat, the support frame A can be properly covered to ensure a comfortable sitting comfort and safety, but there is a chevron-shaped cross section in the width direction at the middle position of the outer surface of both sleeve parts 3, 3. Since the raised bending band portions 4, 4 are provided, when aligning the sleeve portions 3, 3 with the portion extending from the side surface of the support frame to the back surface of the support frame, the side surface of the support frame and the back surface of the support frame are The bending work at the boundary part becomes accurate and easy, and even if the inner side of the bent part of both sleeve parts 3, 3 is crushed and the outer side is stretched after bending, the raised band part 4,
Since 4 has a chevron-shaped cross section, the raised bending band 4,
The top of the seat cover 4 forms an acute corner, and therefore the corner on the back side of the seat covered with the seat cover 8 is finished in a shape with sharp ridge lines, giving it a beautiful appearance. In order to manufacture such a cushion body for a seat, for example, as shown in FIG. 4, both sleeve parts 3 with 4,
The female die 9 has a V-groove portion 9a to correspond to the outer surface shape of No. 3, and the female die 9 has a raised band portion 10a corresponding to the bending assist notches 5, 5 as required. Using a male mold 10 with a shape of It can be easily obtained by foam molding by a method, and after demolding, if necessary, making slits at positions corresponding to the bending raised band parts 4, 4 on the inner surfaces of both sleeve parts 3, 3. It does not require expensive molds or complicated mold release work, and has the advantage of being mass-produced at low cost. In addition, if bending assisting notches 5, 5 are provided on the inner surfaces of both sleeve portions 3, 3, narrow rods 5' are embedded, or a cushion body 1 with a plate-like member 1' attached to the inner surface is used. The bending work is performed by positioning the bending auxiliary notches 5, 5, the embedded part of the thin rod body 5', or the edge of the plate-like member 1' in the corner part of the support frame A. It becomes even easier, and
When the bending assisting notches 5, 5 are provided, the degree of crushing of the inner surface of the folded portion of both sleeve portions 3, 3 after bending is reduced, and the outer shape of the corner portion is also sharper. It can be done.

Therefore, the present invention greatly contributes to the development of the industry by eliminating the problems of conventional seat cushion bodies of this type.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of the present invention, FIG. 2 is a partially cutaway perspective view showing a backrest of a front seat for an automobile using the present invention, and FIG. A partially cutaway plan view showing the seat cushion body according to the invention attached to a support frame, FIG. 4 is a sectional view showing the second embodiment of the invention, and FIG. 5 is a cross-sectional view showing the third embodiment of the invention.
6 is a partial sectional view showing a fourth embodiment of the present invention, FIG. 7 is a partial sectional view showing a fifth embodiment of the present invention, and FIG. 8 is a partial sectional view showing a fifth embodiment of the present invention. 9 is a partial sectional view showing a sixth embodiment of the invention, FIG. 9 is a partial sectional view showing a seventh embodiment of the invention, and FIG. 10 is a partial sectional view showing an eighth embodiment of the invention. 11
The figure is a cross-sectional view of a mold for forming a cushion body for a seat according to the present invention, and FIG. 12 is a partial cross-sectional view showing an example of a conventional cushion body for a seat. 1: Cushion body, 2: Seat part, 3, 3: Both sleeve parts, 4: Raised band part for bending with chevron-shaped cross section, 5: Notch for assisting bending, 1': Plate member, 5': Narrow rod body .

Claims (1)

[Scope of Claims] 1. At a position midway between the outer surfaces of both sleeve portions 3, 3 of a cushion body 1 formed by integrally bending both sleeve portions 3, 3 toward the back from at least both side edges of the seat portion 2. Bending raised band portions 4, 4 having a chevron-shaped cross section in the width direction
A cushion body for a seat, characterized in that it is provided with. 2. The cushion body 1 is provided with folding assisting notches 5, 5 corresponding to the folding raised band parts 4, 4 on the inner surfaces of both sleeve parts 3, 3. Cushion body for the seat as described. 3. Claims 1 or 2 provide that the cushion body 1 has a thin rod body 5' embedded in the flesh of both sleeve portions 3, 3, which correspond to the raised bending band portions 4, 4. Cushion body for the seat as described. 4 The cushion body 1 has a plate-like member 1' which is harder than other parts of the cushion body 1 attached to the inner surface of the portion extending from the seat portion 2 to the intermediate position between the sleeve portions 3, 3. The cushion body for a seat according to item 1, item 2, or item 3. 5. Claim 1 or 2, or The seat cushion body according to item 3 or 4. 6. Claims 1, 2, or 3, in which the folding raised band parts 4, 4 are provided at the step angles of both sleeve parts 3, 3, each of which has a step formed on its front outer surface. Or a cushion body for a seat according to item 4.