JPH10165264A - Seat cushion for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a bottom feeling to simultaneously compress and deform the cushion pad of seat cushion to the limit because of a compressing load. SOLUTION: The cushion pad is prepared by sealing a mat-shaped fiber body structure 5 into a bag body 6 to which gas permeability is applied so as not to let internal air simultaneously flow out because of the compressing load by forming a lot of fine air holes and the action of compression and deformation is timewisely delayed from the reception of compressing load on the cushion pad 1 to the deformation to its critical compressed form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion for a vehicle seat mounted on an automobile or a train.

[0002]

2. Description of the Related Art A seat cushion of a vehicle seat has a structure in which an elastic cushion pad is supported by a metal cushion pad receiving member (cushion pan) and covered with a cushion cover, and receives a compressive load. As the pad, a mat-shaped fiber structure in which fibers are entangled, a polyurethane foam, or the like is used.

[0003]

Among the cushion pads of the seat cushion, the cushion pad of the fibrous structure is compressed and deformed almost instantaneously to the limit when an occupant is seated and a compressive load is applied to the seat cushion. A compressive load is applied to the cushion pad receiving member, so that a so-called bottoming feeling is increased and a seating feeling is deteriorated. An object of the present invention is to improve the sitting comfort of a seat cushion by eliminating a feeling of bottoming in a cushion pad of a fiber structure.

[0004]

According to a first aspect of the present invention, there is provided a vehicle seat cushion in which a mat-shaped fibrous structure is prevented from being subjected to a compressive deformation behavior in which internal air flows out at once by a compressive load. And a cushion pad formed by being enclosed in a bag provided with air permeability.

According to the first aspect of the present invention, when a compressive load is applied to the cushion pad, the cushion pad receives a compressive load due to a flow resistance when air contained in the fibrous structure flows out of the bag body, and then undergoes a limit compressive deformation. There is a time delay until the cushion pad reaches its shape, and the cushion pad is not compressed and deformed to the limit at once, but is compressed and deformed to the limit after a predetermined time elapses, so that the cushion pad does not feel bottomed.

A second aspect of the present invention is to provide a cushion pad by heat-sealing a fiber structure formed by heating and pressurizing a fiber aggregate into which a binder fiber having heat-fusibility is mixed, and the bag body. It is characterized by having been formed.

According to the second aspect of the present invention, the entanglement of the fibers constituting the fiber structure is strengthened, the fiber structure and the bag are integrated, and the cushion pad is improved in form stability. Stabilizes the compression deformation behavior.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. The seat cushion S of the vehicle seat has a structure in which a cushion pad 3 received by a cushion pan 2 is covered by a cushion cover 3.

Cushion pad 1 of seat cushion S
Is formed by heating and pressurizing a fiber assembly mixed with a binder fiber having a heat-fusing property, and a mat-shaped fiber structure 5 in which a group of fibers is fusion-bonded in an entangled state is formed by a large number of minute air holes. And air permeability is provided such that the internal air does not flow out at once by a compressive load but flows out outside at a predetermined time, and the air automatically flows into the inside by deloading. It has a structure sealed in the bag body 6.

The fibrous structure 5 of the cushion pad 1 is made of, for example, a polyester fiber having a normal melting point and a polyester fiber having a melting point of one.
It is produced by a fiber assembly in which low-melting polyester fibers (binder fibers) of 80 to 200 ° C are mixed at a ratio of 70/30.

The bag 6 has, for example, an air permeability of 10 ml / cm.
It is made of a polyurethane film in which minute air holes are uniformly distributed over the entire surface at ² · s or less and the elongation is 200% or more.

The production of the cushion pad 1 can be performed in the steps shown in FIGS. That is, as shown in FIG. 4A, upper and lower films 7, 7 having a large number of minute air holes, and a mat-shaped fiber aggregate 8 mixed with a low-melting binder fiber are combined with the fiber aggregate 8. Is inserted between both films 7. Then FIG.
As shown in FIG. 3B, while the mold is being clamped by the porous molded plate 10a of the lower mold 10 and the porous molded plate 11a of the upper mold 11, both the films 7 are formed by the hot air flowing through the small holes of the porous molded plates 10a and 11a. Then, the fiber assembly 8 is heated. The binder fiber in the fiber assembly 8 is melted by heating to form a mat-shaped fiber structure 5 in which the fiber groups are fusion-bonded in an entangled state, and at the same time, the periphery of both films 7 and the periphery of the fiber assembly 8 The bag 6 is sealed by heat welding to form a bag body 6 whose peripheral edge 6a is sealed, and the bag 6 and the surface layer of the fibrous structure 5 sealed in the bag body 6 are heat welded to each other. To form

When an occupant sits on the seat cushion S provided with the cushion pad 1 and a compressive load is applied to the cushion pad 1, the air contained in the fibrous structure 5 does not flow out at once and the bag 6 passes through the bag body 6. The cushion pad 1 leaks out of the bag body 6 while receiving flow resistance through the pores, and the cushion pad 1 is compressed and deformed to a limit after a predetermined time elapses. Causes a time lag, and the cushion pad behaves in a time-delayed compression deformation manner.

Therefore, a cushion effect combining the cushion effect of the fibrous structure 5 itself and the air cushion effect accompanying the leakage of the air contained in the fibrous structure 5 is provided to the cushion pad 1. At the same time, the feeling of bottoming which is compressed and deformed to the limit disappears and the initial sitting feeling at the time of sitting on the seat is improved.

[0015]

According to the first aspect of the present invention, when a compressive load is applied to the cushion pad, the air in the fibrous structure flows out of the bag body while receiving the flow resistance, so that the cushion of the fibrous structure itself is removed. When the cushion pad is compressed and deformed in a state where the characteristics and the air cushion characteristics due to air flow resistance are combined, the cushion pad is compressed and deformed to the limit at once. Can be improved.

According to the second aspect of the present invention, it is possible to improve the form stability of the cushion pad and to stabilize the compression deformation behavior of the cushion pad.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, and is a longitudinal sectional view of a cushion pad.

FIG. 2 is a perspective view of a vehicle seat.

FIG. 3 is an exploded perspective view of a seat cushion.

FIG. 4 is an explanatory view showing a method for forming a cushion pad.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cushion pad 5 Fiber structure 6 Bag body S Seat cushion

Claims (2)

[Claims] 1. A cushion pad formed by enclosing a mat-shaped fibrous structure in a bag provided with air permeability so as to prohibit a compressive deformation behavior in which air inside flows out at once by a compressive load. A seat cushion for a vehicle, comprising: 2. A fiber structure formed by heating and pressurizing a fiber assembly mixed with a binder fiber having heat-fusibility,
The vehicle seat cushion according to claim 1, wherein the cushion pad is formed by heat-sealing the bag pad.