JPH1142380A - Seat cushions - Google Patents

Abstract

(57) [Summary] [Problem] To provide a seat cushion that does not give a sense of incongruity and can improve sitting comfort. SOLUTION: Since a soft upper layer foam 20 is used and a seating surface is made soft, a chamfered portion 35 is provided on an upper rear portion 34 of a front end portion 31 of a hard lower layer foam 30 without impairing sitting comfort. The upper rear portion 34 of the front end 31 of the lower foam 30 is provided so that the upper rear portion 34 is not perceived on the back side of the thigh of the occupant via the soft upper foam 20 without giving a feeling of strangeness to the occupant. It is possible to improve the sitting comfort by preventing the back side of the seated person from pressing the back of the thigh.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion of a seat device in which a padding in a seat cushion is formed by a foam body.

[0002]

2. Description of the Related Art In recent years, seat cushions as seats have been developed in the form of a full urethane foam in which the filling in the seat cushion is made of a foam body such as a polyurethane foam in order to reduce the weight. In forming such a foam body, the hardness and softness of the polyurethane foam are selected based on both considerations of the production side such as workability and the performance side such as sitting comfort. As a way of thinking on the production side, in the case of the full urethane foam, there is no metal frame which is a general support frame for seat cushions. Hard materials are required.

[0003] In terms of performance, in general, a seated occupant wants a soft seat, and in consideration of its durability, a full urethane foam is required to be somewhat soft. Based on the two-sided concept, as a conventional seat cushion, as shown in FIGS. 6 and 7, the seat body foam body 1 is divided into an upper foam 2 and a lower foam 3, and is supported by the front frame portion of the seat frame. The front end 4 of the lower foam 3 is made to be hard, and the front edge of the covering cloth to be coated is fastened to the front end 4 of the hard lower foam 3 that does not significantly deform, thereby improving workability.
The other parts of the lower layer foam 3 and the upper layer foam 2 are made soft so that the sitting comfort can be improved.

[0004]

However, in such a seat cushion of the conventional seat apparatus, the corner 5 of the upper surface rear edge of the front end 4 of the rigid lower layer foam 3 is seated by the occupant via the soft upper layer foam 2. Is felt on the back side of the thigh, giving the occupant a sense of incongruity, and when the corner 5 of the upper surface rear edge of the front end 4 of the rigid lower-layer foam 3 comes to press on the back side of the occupant's thigh, There was a problem that the sitting comfort became worse. The present invention has been made in view of such problems of the prior art, using a soft upper foam, making the seating surface soft, without impairing the sitting comfort, rigid lower foam. A chamfered portion is provided at the upper rear portion of the front end of the front end portion so that the upper rear portion is not felt on the back side of the thigh of the seated person via the soft upper layer foam,
A seat cushion for a seat device that can improve the sitting comfort without giving the seated person a feeling of discomfort, without the rear upper surface of the front end of the lower layer foam pressing the back side of the seated person's thigh. It is intended to provide.

[0005]

The gist of the present invention to achieve the above object lies in the following inventions. [1] The seat cushion (10) is supported on the seat frame (12), and the filling in the seat cushion (10) is foamed (20a).
In the seat cushion (10) of the seat device constituted by
The foam body (20a) includes an upper foam (20) constituting an upper layer thereof and a lower foam (3) constituting a lower layer thereof.
0), wherein the front end (31) of the lower foam (30) is formed of a rigid foam material,
It is placed on the seat frame (12), and the upper surface rear portion (34) of the front end portion (31) of the lower foam (30).
Has a chamfered portion (35) that is inclined downward toward the rear.
0).

[2] Tongue (1) sitting on a seat frame (12)
0), and the seating pad (10) of the seat device in which the filling in the seat pad (10) is constituted by the foam body (20a).
In the above, the foam body (20a) comprises an upper foam (20) constituting an upper layer thereof and a lower foam (30) constituting a lower layer, and a front end portion (31) of the lower foam (30) is vertically arranged. The upper foam (20) is composed of a superimposed upper foam (32) and a lower foam (33). The subsequent foam (38) following the front end (31) of the lower foam (30) and the upper foam (20) are made of a soft material. The upper foam (32) is formed of a soft foam material, and the lower foam (33) is formed of a hard foam material and is mounted on the seat frame (12). The upper rear portion (34) of the lower form (33) on which the upper form (32) overlaps is a chamfer inclined downward and rearward. Cushion of the seat apparatus, characterized in that a (35) (10).

[3] Ton (1) sitting on the seat frame (12)
0), and the seating pad (10) of the seat device in which the filling in the seat pad (10) is constituted by the foam body (20a).
, The front part of the seat frame (12) is constituted by a front frame part (13),
a) is composed of an upper foam (20) constituting the upper layer and a lower foam (30) constituting the lower layer, and the front end (31) of the lower foam (30) has an upper foam ( 32) and a lower foam (33), the front end (31) of the lower foam (30).
And the upper foam (20) are formed of a soft foam material, the upper foam (32) is formed of a soft foam material, and the lower foam (33). ) Is formed of a rigid foam material, and the upper rear portion (34) of the lower foam (33) on which the upper foam (32) overlaps has a chamfered portion (35) inclined downward and rearward. The lower form (33) includes a placement form part (36) placed on the front frame part (13) and a front end part (3) of the front frame part (13).
A surface cloth (40) having a hanging foam part (37) hanging at a front position of 1) and covering the foam body (20a);
Covers the front end surface of the upper foam (20) and the hanging foam part (3) of the lower foam (33).
A seat cushion (10) for a seat device, which covers the front surface of (7) and is fixed to the rear surface of the hanging foam part (37).

Next, the operation of the invention described in each of the above items will be described. In the seat cushion (10) of the seat device according to [1], the foam body (20a) is composed of an upper foam (20) constituting an upper layer thereof and a lower foam (30) constituting a lower layer thereof. Since the front end portion (31) is formed of a hard foam material, the soft upper foam (20) softens the seating surface and does not impair sitting comfort.

The load of the occupant is applied to the seat frame (12) via the upper foam (20) and the lower foam (30).
Receive. The reaction force of the occupant's load is determined by the seat frame (12).
To lower layer foam (30) and upper layer foam (20)
Through the thighs of the seated person.

The upper rear portion (34) of the front end portion (31) of the lower foam (30) has a chamfer (35) inclined downward and rearward, so that the occupant can use the soft upper foam. (20) through the rigid underlying foam (3
0), the front end (31) of the lower foam (30) does not feel the front end (31), and the rear end (34) of the upper surface of the front end (31) of the lower foam (30) does not press the back side of the thigh of the occupant. Good.

The seat cushion of the seat device according to item [2] (1)
In (0), the seating surface is softened by the soft upper layer foam (20), and the sitting comfort is not impaired. The upper rear portion (34) of the lower foam (33), on which the soft upper foam (32) overlaps, has a chamfer (35) that slopes downwards rearward, so that the occupant can use the soft upper foam. (20) and also a rigid lower foam (3) via a soft upper foam (32).
The front end (31) of the lower part (0) is not felt, and the rear part (34) of the upper surface of the rigid lower foam (33) does not press the back side of the thigh of the seated person, so that the sitting comfort is good.

The seat cushion of the seat device according to the item [3] (1)
In (0), the seating surface is softened by the soft upper layer foam (20), and the sitting comfort is not impaired. The upper rear portion (34) of the lower foam (33), on which the soft upper foam (32) overlaps, has a chamfer (35) that slopes downwards rearward, so that the occupant can use the soft upper foam. (20) and also a rigid lower foam (3) via a soft upper foam (32).
The front end (31) of the lower part (0) is not felt, and the upper rear part (34) of the rigid lower foam (33) does not compress the back side of the thigh of the occupant, so that the sitting comfort is good.

The placement form part (36) of the lower form (33) is placed on the front frame part (13) of the seat frame (2), and the hanging form part (37) of the lower form (33) is placed in front. Front end part (31) of frame part (13)
Hanging in front position.

The mounting foam part (36) is provided with the seat frame (1).
Since it is placed on the front frame part (13) of 2), the seating load can be reliably received without the rigid placement foam part (36) being significantly deformed. When covering the front fabric (40) with the foam body (20a), the front end (31) of the front fabric (40) covers the front end face of the upper foam (20) and the lower foam (3).
It covers the front surface of the hanging foam part (37) of 3) and is fixed to the rear surface of the hanging foam part (37). At this time, since the hanging foam part (37) is also hard,
The front edge of the outer fabric (40) can be stopped without any significant deformation.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. FIG. 2 is a perspective view of the seat device according to one embodiment of the present invention. FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is a plan view of the seat cushion according to one embodiment of the present invention. FIG. 5 is a view on arrow V in FIG.

As shown in FIGS. 2 to 5, a seat frame 12 of the seat device 10a is supported on a pedestal as an installation portion, and a seat cushion 10 is supported on the seat frame 12, and a seat cushion 10 is supported.
The filling inside is constituted by the foam body 20a.
The seat frame 12 includes a front frame portion 13 that constitutes a front portion.
And a rear frame (not shown) constituting a rear portion. A backrest 15 is supported by the rear frame so as to be tiltable between a standing posture and a reclining posture.

A polyurethane foam is used for the foam body 20a. The foam body 20a is composed of an upper foam 20 constituting an upper layer and a lower foam 30 constituting a lower layer. The upper layer foam 20 is composed of four layers,
From above, a soft polyurethane foam layer 21, a cloth layer 22,
It is composed of a soft polyurethane foam layer 23 and a thin sponge layer 24. As a result, the entire upper layer foam 20 is soft. Further, a foam 25 having a triangular cross section is bonded to both sides of the polyurethane foam layer 21.

As shown in FIGS. 1, 3 and 5, the front end 31 of the lower layer foam 30 is composed of an upper foam 32 and a lower foam 33 which are vertically overlapped. The succeeding foam 38 following the front end 31 of the lower foam 30 and the upper foam 20 are formed of a flexible polyurethane foam. The upper foam 32 is made of a soft polyurethane foam, and the lower foam 3
3 is made of a rigid polyurethane foam.

The upper surface rear portion 34 of the lower form 33 on which the upper form 32 overlaps has a chamfered portion 35 inclined downward and rearward. The chamfered portion 35 is formed as a flat surface from the front edge to the rear edge of the upper surface of the lower form 33 so that not only the lower form 33 but also the upper form 32 can be easily formed.
Depending on the hardness, it may be sufficient to cut off only the corners corresponding to the upper rear portion 34. Also, the chamfered portion 35
Is not limited to a flat surface, and may be a curved surface largely curved upward. In short, it is only necessary that the upper rear portion 34 is not angular.

The lower form 33 is suspended from a placement form section 36 placed on the front frame section 3 and a position in front of the front end section 31 of the front frame section 13 to cover the front end section 31 from the front. Consisting of Front frame part 1
3 has a front extension portion 14 extending obliquely upward and forward, and is placed on the front extension portion 14 of the front frame portion 13 such that the back surface of the placement foam portion 36 is along the front extension portion 14. The foam body 20a is covered with a surface fabric 40, and a front end portion 41 of the surface fabric 40 covers a front end surface of the upper foam 20 and also covers a front surface of a hanging foam portion 37 of the lower foam 33, and a hanging foam portion 37. It is fastened to the back. Although not shown, a zipper cloth is adhered to the rear surface of the hanging foam part 37, and a zipper cloth is sewn to the front edge of the front cloth 40, so that both fasteners are engaged.

Next, the operation will be described. The foam body 20, which is the filling of the seat cushion 10, is provided with a soft upper foam 20 as an upper layer, so that the seating surface is softened and the sitting comfort is not impaired. When seated on the main seat 10, the upper layer foam 20 is largely bent, and the seat frame 12 receives a seating load via the lower layer foam 30.

At this time, at the front end of the seat cushion 10 where the thigh of the occupant hits, the upper rear part 34 of the rigid lower form 33 on which the soft upper form 32 overlaps,
The front end of the rigid lower foam 30 via the soft upper foam 20 and also the soft upper foam 32 on the back side of the thigh of the seated occupant because it has a chamfered portion 35 inclined downward and rearward. Without feeling part 31
The seated person does not need to feel uncomfortable. The upper rear portion 34 of the rigid lower foam 33 does not press against the back of the thigh of the occupant, and the sitting comfort is good.

At the front end of the seat 10, the placing form 36 of the lower form 33 is placed on the front frame 13 of the seat frame 12, and the lower form 33
Of the front end portion 31 of the front frame portion 13
, And the hanging foam part 37 covers the front frame part 13 from the front. Placing form part 3
6 is placed on the front frame portion 13 of the seat frame 12, so that the seating load can be reduced by the rigid placement foam portion 36.
Can be reliably received without any significant deformation. When covering the front fabric 40 with the foam body 20a, the front end portion 31 of the front fabric 40 covers the front end surface of the upper foam 20 and also covers the front surface of the hanging foam portion 37 of the lower foam 33, and A zipper cloth (not shown) wound around the back side of the front end portion 31
Are engaged with a fastener cloth (also not shown) on the rear surface side of the hanging foam part 37. At this time, since the hanging foam portion 37 is also hard, the front end portion 31 of the outer cloth 40 can be stopped without being greatly deformed.

In the above embodiment, the placing foam part 36 and the hanging foam part 37 are shown as separate bodies, but they may be formed integrally. Similarly, upper form 3
2 and the succeeding form 38 are shown separately, but they may be formed integrally.

[0025]

According to the seat cushion of the seat device according to the present invention, the upper surface of the front end portion of the rigid lower foam is used without impairing the sitting comfort because the soft upper foam is used and the seating surface is made soft. Since the chamfered portion is provided at the rear portion, the upper rear portion is prevented from being sensed behind the thigh of the seated person via the soft upper layer foam, so that the front end of the lower layer foam is not given to the seated person without discomfort. The rear portion of the upper surface of the part does not press the back side of the thigh of the seated person, and the sitting comfort can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a seat cushion foam body according to an embodiment of the present invention.

FIG. 2 is a perspective view of a seat device according to one embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 4;

FIG. 4 is a plan view of the seat cushion according to one embodiment of the present invention.

FIG. 5 is a view taken in the direction of the arrow V in FIG. 4;

FIG. 6 is a side view of a seat cushion showing a conventional example.

FIG. 7 is a sectional view of a seat cushion showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10a ... Seat device 12 ... Seat frame 13 ... Front frame portion 14 ... Front extension 15 ... Swallow 10 ... Seat cushion 20 ... Upper layer foam 20a ... Foam body 21 ... Rurethane foam layer 22 ... Clothing layer 24 ... Sponge layer 30 ... Lower layer foam DESCRIPTION OF SYMBOLS 31 ... Front end part 32 ... Upper form 33 ... Lower form 34 ... Upper surface rear part 35 ... Chamfering part 36 ... Placing form part 37 ... Hanging form part 38 ... Subsequent form 40 ... Front cloth 41 ... Front end part

Continuation of the front page (72) Inventor Katsumi Tashiro 100, Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Koito Industry Co., Ltd.

Claims (3)

[Claims] 1. A seat cushion of a seat device in which a seat cushion is supported by a seat frame and a filling in the seat cushion is constituted by a foam body, wherein the foam body is composed of an upper foam constituting an upper layer and a lower foam constituting a lower layer. The front end of the lower foam is formed of a rigid foam material, and is placed on the seat frame, and the rear upper surface of the front end of the lower foam has a chamfer inclined downward and rearward. A seat cushion of a seat device characterized by having a part. 2. A seat cushion of a seat device in which a seat cushion is supported by a seat frame and a filling in the seat cushion is constituted by a foam body, wherein the foam body is composed of an upper foam constituting an upper layer and a lower foam constituting a lower layer. The front end of the lower foam comprises an upper foam and a lower foam superimposed one on top of the other, and a subsequent foam following the front end of the lower foam, and the upper foam is formed from a soft foam material. The upper foam is formed of a soft foam material, the lower foam is formed of a rigid foam material, and is placed on the seat frame; and the upper surface of the lower foam where the upper foam overlaps A rear portion having a chamfered portion inclined downward toward the rear; Cushions of the device. 3. A seat cushion for a seat apparatus in which a seat cushion is supported on a seat frame and a filling in the seat cushion is constituted by a foam body, wherein a front portion of the seat frame is constituted by a front frame portion, and the foam body comprises: It comprises an upper layer foam constituting the upper layer and a lower layer foam constituting the lower layer, and the front end of the lower layer foam comprises an upper form and a lower form superimposed on top and bottom, and a succeeding part following the front end of the lower layer foam The foam and the upper foam are formed of a soft foam material, the upper foam is formed of a soft foam material, the lower foam is formed of a hard foam material, and the upper foam is The upper rear surface of the overlapping lower foam has a chamfered portion inclined downward toward the rear, The lower form has a placement form part placed on the front frame part, and a hanging form part hanging down at a position in front of a front end of the front frame part. A seat cushion for a seat device, which covers a front end surface of an upper foam and covers a front surface of a hanging foam portion of the lower foam and is fixed to a rear surface of the hanging foam portion.