JPH0976797A - Seat cushion for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat cushion for an automobile, whose prescribed parts give a feeling of softness, which is inexpensive, which is manufactured so as to easily obtain the feeling of constant, surface softness, and in which the feeling of softness can easily be varied in correspondence to the location of the surface of the cushion in manufacturing. SOLUTION: On the surface of a foam body 11, which was formed by die foaming into the shape of a seat, a plurality of grooves 16 are formed, the surface of which do not have a skin layer 14 of a foam body formed by die foaming. Thus, the surface can be softened by an uneven part 15 consisting of the groove 16 and an inter-groove part 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat cushion.

[0002]

2. Description of the Related Art A seat cushion for an automobile is foam-molded in a mold (also called mold molding or molding).
Often used foams are used. This seat cushion is used while being covered with a skin. In addition, the seat cushion preferably has a soft surface in order to improve riding comfort.

Conventionally, there are the following means for softening the surface of the seat cushion. As shown in FIG. 6, the first means is to adhere a soft member 31 made of a material softer than the foam 30, such as slab urethane, to the surface of the foam 30 molded. As a second means, as shown in FIG. 7, the soft member 31 is placed in a mold 32, and a foaming raw material P is injected into the mold to foam-mold a seat cushion integrally having a soft member on the surface. To do. The third means is as shown in FIG.
Plural foaming raw materials Pa and P forming foams having different hardness
b is injected into the mold 33 to foam-mold a seat cushion having a soft foam laminated on the surface.

[0004]

However, the seat cushion whose surface is softened by the above means has the following problems. The first means has a problem in that the soft feeling of the soft member 31 is not constant due to variations in the amount of adhesive applied and the desired soft feeling is difficult to obtain. In particular, when the soft member is thin, the feel of the adhesive cured between the soft member and the foam is likely to be transmitted to the surface of the soft member, and is more likely to be affected by variations in the adhesive. Further, in the case of this means, there is a problem that the product cost becomes high because a soft member is separately required.

According to the second means, the soft member 31
Since the foaming raw material P is impregnated in and the impregnated portion becomes hard, there is a problem that the effect of the soft member cannot be sufficiently obtained. Further, similar to the first means, since a soft member is required, there is a problem that the product cost becomes high.

According to the third means, since a plurality of foaming raw materials Pa and Pb are injected into the mold 33 to cause foaming, it is difficult to keep the foaming state constant, and the seat cushion obtained is soft on the surface. There is a problem that the physical properties of the part are likely to vary and the soft feeling of the surface is difficult to be constant. Further, since it is necessary to inject a plurality of foaming raw materials into a mold for foam molding, workability is poor, and equipment costs are high, resulting in high product cost.

Further, in the first to third means, when it is desired to have a different soft feeling on the surface due to a difference in automobile grade, the soft member or the blending of the foaming raw material must be changed. The work was extremely troublesome.

Further, for example, when the front surface of the seat cushion which comes into contact with the thigh of the driver is made softer than the surface of the other parts, and the driver's pedal operation is desired to be comfortable, When it is desired to obtain a seat cushion having a different soft feeling depending on the position, the above first to third means cannot be easily applied.

Therefore, the present invention solves the above problems by providing a desired surface portion with a predetermined soft feeling, at a low cost, and easily obtaining a constant surface soft feeling during manufacturing. Another object of the present invention is to provide an automobile seat cushion that can be manufactured by further varying its softness according to the position of the surface.

[0010]

According to the present invention, a plurality of grooves having no skin layer on the surface of the foam formed by the molding are formed on the surface of the foam which is foam-molded into a seat shape by molding. And a concave-convex portion formed by the groove and an inter-groove portion is provided.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view of an automobile seat cushion according to an embodiment of the present invention, FIG. 2 is a partial sectional view taken along line 2-2, and FIG. 3 is a partial perspective view of a foam body of the same embodiment, FIG. 4 is a cross-sectional view showing the molding of the foam, and FIG. 5 is a partial perspective view of the foam showing an example of molding the groove.

An automobile seat cushion 10 shown in FIGS. 1 to 3 comprises a foam 11 such as urethane foam.
The surface is covered with an outer skin (not shown) made of fabric or the like to form a seat. This foam 11
Is the center part 1 of the side surface 12, 12 of the seating surface side.
Compared with No. 3, it has a raised shape, and the sitting shape of the occupant is correctly maintained by the raised shape.

As shown in FIG. 4, the foamed body 11 is molded into a seat shape by injecting a foaming raw material P such as urethane raw material into a mold 25. As shown in FIG. It has a skin layer 14. The skin layer 14 is a portion formed by pressing the foaming raw material P against the mold surface 26 by the foaming pressure at the time of molding, and has a higher density than the central portion of the foam 11.

Further, an uneven portion 15 is formed in the central portion 13 of the surface of the foam 11. The uneven portion 15 weakens the impact resilience near the surface of the seating surface and makes the surface feel softer than the surface of other portions, and the plurality of grooves 16 formed on the surface of the foam 11. And its groove part 1
7.

The groove 16 has a surface 18 on the skin layer 14 formed on the surface of the foam 11 when the foam 11 is molded.
It consists of what you don't have. Since the skin layer 14 is composed of a high-density layer, when it is present on the surface 18 of the groove 16,
The rigidity of the uneven portion 15 becomes high, and the desired soft feeling cannot be obtained. In particular, when the skin layer is present on the side surface 19 of the groove 16, the skin layer is present along the compression direction of the foam 11 when seated, so that the skin layer compresses the surface of the foam 11 when seated. Deformation may be impeded and the surface feel may be harder than without grooves. Therefore,
In the present invention, the groove 16 does not have a skin layer on its surface to facilitate the compressive deformation of the uneven portion 15 and to make the surface of the uneven portion 15 soft.

The depth d, width a, and spacing b of the groove 16 are
By appropriately setting, the soft feeling of the uneven portion 15 can be set to a desired degree. Usually, the depth d of the groove is 5 to
15 mm, width a is 0.5 to 3 mm, and spacing b is 15 to 30
About mm is preferable. Furthermore, the softness of the uneven portion 15 may be locally changed by partially changing the depth d of the groove. For example, as shown in FIG. 3, the depth d of the groove may be deeper on the front side 11a than on the rear side 11b of the foam 11 so that the foam front side 11a is softer than the rear side. Further, the uneven portion 15 is not limited to the one provided in the central portion 13 between the side portions 12 of the foam 11 from the front portion to the rear portion as in this embodiment, and the foam 11 is not limited thereto.
It is provided at an appropriate position on the surface.

The groove 16 is formed by cutting the foam 11 molded in a shape without the groove with a blade such as a rotary blade 20 as shown in FIG.
Alternatively, it is made by cutting the surface of the foam 11 into a groove shape with another known cutting tool. Therefore, the foam 1
The groove 16 can be easily formed by simple equipment without changing the molding die of No. 1, and the depth, width, and interval of the groove 16 can be freely set when the groove 16 is formed. Therefore, foam 1
It is possible to easily obtain a seat cushion in which a desired position on one surface has a desired soft feeling. Further, since the groove 16 can be formed by post-processing the molded foam, it is easy to form a constant groove and it is easy to obtain a soft feeling of a constant surface.

[0018]

As shown and described above, the seat cushion for an automobile of the present invention has a plurality of grooves having no skin layer on the surface of the foam which is foam-molded into a seat shape by molding. However, since the uneven portion composed of the groove and the portion between the grooves is provided, the surface feeling of the uneven portion becomes soft, and a good riding comfort can be obtained.

Further, in the automobile seat cushion of the present invention, since the skin layer of the seating surface is partially removed by providing the groove, the internal foam of the open cell structure is exposed, and the air permeability of the seating surface is improved. Increase. As a result, it is possible to prevent the seating surface from getting damp when riding.

Moreover, the seat cushion for an automobile according to the present invention has an effect that the softness of the surface can be desired by appropriately setting the depth, width and interval of the groove. Furthermore, by partially changing the depth of the groove,
The soft feeling can be locally changed depending on the position of the seating surface.

Further, in the automobile seat cushion according to the present invention, since the groove can be formed by machining, the unevenness formed by the unevenness formed by the groove and the inter-groove portion has little variation and a constant soft feeling. Obtainable.

In addition to these, the automobile seat cushion of the present invention does not require an extra soft member made of slab urethane or the like, and does not require a complicated manufacturing facility, so that it has an effect of being inexpensive.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle seat cushion according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line 2-2.

FIG. 3 is a partial perspective view of a foam body according to the embodiment.

FIG. 4 is a cross-sectional view showing a foamed body during molding.

FIG. 5 is a partial perspective view of a foam showing an example of molding a groove.

FIG. 6 is a cross-sectional view showing an example of a conventional automobile seat cushion.

FIG. 7 is a cross-sectional view showing another example of molding of a conventional automobile seat cushion.

FIG. 8 is a cross-sectional view showing the molding of still another example of the conventional automobile seat cushion.

[Explanation of symbols]

 11 Foam 14 Skin Layer 15 Concavo-convex Part 16 Groove 17 Intergroove Part 18 Groove Surface 19 Groove Side Surface

Claims (1)

[Claims] 1. A plurality of grooves having no skin layer on the surface of the foam formed by the molding are formed on the surface of the foam that is foam-molded into the seat shape by the molding, and the grooves and the grooves are formed. An automobile seat cushion, which is provided with an uneven portion composed of a space portion.