JPH02257909A - Cushion for seat - Google Patents

Abstract

PURPOSE:To reduce the fatigue during a long time drive by providing a cushion pad having a hard upper layer so as to give a surface rigidity in order to uniformly distribute the weight of a human body over the cushion pad, thereby preventing any part from being exerted with a locally high seating pressure. CONSTITUTION:A seat cushion 1 comprises a seat part 1a, and bank sections 1b on both sides of the seat part 1a. A cushion pad 3 comprises a lower layer 3a made of a resilient and soft urethane foam material and an upper layer 3b superposed on the lower layer 3a and extended entirely in the longitudinal direction of the seat while having a high surface rigidity. When a person sits on the seat, the seat part 1a is alone lowered by the weight of the human body of the person which does not affect upon the bank sections 1b, substantially. Further, in this case, the seat part 1b is uniformly lowered, and accordingly, it is possible to avoid deeply lowering a hit part alone. The weight of the human body is received by the upper layer 3b of the cushion pad 3, and is uniformly distributed all over the lower layer 3a. Thereby the seat cushion 1 is deformed substantially horizontally, and accordingly, it is possible to obtain a seating stability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seat cushion, and more particularly to a cushion band for a vehicle seat.

(Prior art) Conventional seats, for example, cushion bands for vehicle seats, are made of urethane. When sitting on the cushion pad, only the buttock part flexes more than other parts, so in order to ensure a comfortable sitting feeling, the buttock band is made of urethane. A cushion band of sufficient thickness is required for the lower part. Conventional cushion bands tend to sag, which tends to put pressure on the abdomen, leading to early fatigue when driving a vehicle.

To solve this problem, the upper layer is a flexible pad made of soft plastic foam that feels good when sitting, and the lower layer is a relatively hard pad made of hard plastic foam to ensure support. A two-layer cushion pad has been proposed.

In such a conventional cushion pad, as shown in FIGS. 7 and 8, when a person 6 sits on the cushion pad 201, only the buttocks of the person 6 slump, there is no cushion bulge, and the bank of the cushion pad 201 is depressed. Section 202
However, as shown in FIG. 8, there is a problem in that the cushion moves along the buttocks from the state shown by the two-dot chain line to the state shown by the solid line when the user sits down, creating a feeling of lateral pressure. This is due to the softness of the upper layer of the cushion pad and the insufficient surface rigidity of the hard plastic foam.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a seat cushion pad that does not cause depression in the buttocks and does not cause a feeling of pressure on the abdomen.

[Means to solve the problem]

The present invention solves the above-mentioned problem by providing a seating part which is formed in a layered manner, with at least the part in contact with the buttocks having an upper layer made of a hard layer having surface rigidity and a lower layer made of a soft urethane foam having elasticity. This problem was solved by a seat cushion pad that is characterized by

[Effect]

According to the present invention, the cushion pad of the seat has palm ivy on the lower layer made of soft urethane foam having elasticity at least in the portion of the seating portion that contacts the buttocks.
Or, a hard upper layer with surface rigidity such as Neocar is formed in a layered manner, and when a person sits on this seat cushion,
The human's buttocks press against the hard top layer with planar rigidity, and the weight of the person is distributed across the soft urethane foam bottom layer. For this reason, the entire seat cushion flexes, giving it a cushioned feel.

〔Example〕

The details of the present invention will be explained based on embodiments shown in the drawings.

In Figs. 1 to 3, the seat cushion l is the seating portion 1.
a and bank portions 1b on both sides of the seating portion. The seating portion 1a and bank portion 1b of the seat cushion 1 each include a cushion pan 2, a cushion band 3 formed on the cushion pan 2, and a covering material 4 formed on the cushion pad 3.

The cushion pad 3 has a seating part 1a and a bank part 1b integrally formed, and a deep groove 6 extending in the front-rear direction of the seat is formed at the boundary between the seating part 1a and the bank part 1b.

The cushion pad 3 includes a lower layer 3a made of elastic soft urethane foam in the seating portion 1a, and an upper layer comprising a hard layer with high planar rigidity that rests on the lower layer 3a and spreads over the entire front and back direction of the seat. 3b, the cushion pad 3 is bonded or installed or integrally formed, and the cushion pad 3 is formed in layers. Hard upper layer 3b with high plane rigidity
is formed, for example, as a fiber molded layer of palm lota, neocurl, etc. In the bank portion 1b, only a lower layer 3a made of elastic soft urethane foam is formed.

After the cushion pad 3 is assembled to the cushion pan 2, the covering material 4 is coated on the cushion pad 3.
The facing material 4 has a skin 4a made of a woven fabric, an intermediate layer 4b made of a filling such as slab urethane, and a lining 4c made of cotton cloth or nonwoven fabric, so that a design and texture can be obtained.

The upholstery material 4 is formed in a layered form having an outer skin 4a, an intermediate layer 4b, and a lining 4C, and includes a portion covering the cushion pad 3 in the seating portion 1a and a portion of the cushion pad 3 in the bank portion 1b.
The portion covering the outer skin 4a is connected to the outer skin 4a by a connecting portion 7 formed of the same fabric as the outer skin 4a.

A hanging bag 4d is fixed to a connecting portion 8 between the connecting portion 7 and a portion of the bank portion 1b that covers the cushion pad 3, and is located deep in the groove 6. The hanging bag 4d is suspended via a hog ring 5 to a wire 9 embedded in the tension pad 3.

A portion of the upholstery 4 in contact with the outer side surface of the bank portion 1b is formed as an outer covering portion 4e made of the same fiber as the skin 4a, so that the entire cushion pad 3 can be covered with the upholstery 4. An end portion of the outer cover portion 4e is locked to a locking portion 2a of the cushion pan 2.

The upholstery 4 has an outer sheath 4e formed of the same fabric as the upholstery 4a at the front and rear ends of the seating portion 1a, and the end of the outer sheath 4e is attached to the locking portion 2 of the cushion pan 2.
It is locked in a.

When a person sits on the seat seat 1 having the structure shown in FIGS. 1 to 3, the state shown by the solid line is changed from the state shown by the two-dot chain line to the state shown in FIGS. 4 and 5. transforms into

Since the seat cushion 1 is suspended deeply in the contraction direction, when a person sits on the seat, the weight of the person 6 is hardly affected by the bank portion 1b of the seat cushion 1, and the weight of the person 6 is transferred to the seating portion 1a.
Chisel sinks. Moreover, in this case, the entire body sinks almost uniformly, and it is avoided that only the butt part sinks deeply, as in the conventional case shown in FIGS. 7 and 8. Since the upper layer 3b of the cushion pad 3 receives the human weight and distributes the load over the entire lower layer 3a, the seat cushion 1 is deflected almost horizontally, providing stability for seating.

As another example, as shown in FIG. 6, the seat part 1a is divided into a main seating area 101a at the rear where the buttocks mainly contact and a front edge part 101b at the front where the legs contact, and the cushion pad 103 is divided into the main seating area Only 101a is formed as a layered pad consisting of an upper layer 103b as a fiber molded layer with high planar rigidity and a lower layer 103a made of a soft urethane foam having elasticity, and the old edge 101a is a cushion band like the above-mentioned bank portion 1b. 103 is a urethane pad layer 10 made of a soft urethane foam having elasticity.
3a only. In this case, at the boundary between the main seating aM area 101a and the front edge 101b, a layer 106 of urethane foam is formed, and the covering material 10
4 is the epidermis 104a and the intermediate layer 104b as in the example of FIG.
and a lining 1.04c, the part covering the main seating area and the part covering the front edge are connected, a hanging bag 104d is fixed to the connecting part, and the hanging bag 104d is attached to the hog ring 10.
5, the wire 109 is embedded in the urethane foam and extends laterally.

〔effect〕

According to the present invention, since the upper layer of the cushion band is hard and has plane rigidity, the human weight is distributed over the entire body, and there is no part of the buttocks that receives high sitting pressure, which reduces fatigue during long driving. was completed.

With the present invention, the amount of deflection of the cushion due to a person sitting on it is less than that of a seat with an all-urethane pad, making it possible to make the seat cushion pad thinner, allowing vehicles with a small space to be equipped with a cushion-like seat traction. It became possible.

In the case of molded urethane, concavities may be formed in the surface layer due to entrainment of air, etc., and if left as is, it would create a foreign body feeling at the bottom and would require repair, but with the present invention. By providing a hard layer on top of the urethane, it became possible to cover up some defects, eliminating the need for repairs.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a seat cushion according to the present invention, Fig. 2 is a perspective view of a seat cushion according to the present invention;
The figure is a sectional view taken along ■-■ of FIG. 1, FIG. 3 is a sectional view taken along ■-■ of FIG. Figure 5 is H, P
6 is a view corresponding to FIG. 2 of another embodiment of the present invention, and FIG. 7 is a longitudinal sectional view through H and P of a conventional seat cushion when a person is seated on it. FIG. 8 is a cross-sectional view. l... Sheet cushion 3... Cushion pad 3b... Upper layer 2... Cushion pan 3a... Lower layer 4... Covering material agent Patent attorney Hideaki Kuwahara Figure 8

Claims (3)

[Claims] (1) At least the part of the seating part that contacts the buttocks is formed into a layered structure, including an upper layer made of a hard layer with surface rigidity and a lower layer made of soft urethane foam with elasticity. seat cushion. (2) A seat cushion characterized in that it is formed in a layered manner, comprising a hard upper layer having surface rigidity over the entire surface of the seating portion and a lower layer made of soft urethane foam having elasticity. (3) The front edge of the seating portion is formed only of a layer made of soft urethane foam, and the main seating portion that the buttocks contacts has an upper layer made of the hard layer and a soft lower layer having elasticity. The seat cushion according to claim 1.