JPS62242527A - Laminated resin foam and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Ll! Standing and fLjlJk The present invention is a pad for am of a seat seating part for a vehicle.
The present invention relates to a laminated resin foam used as a laminate and a method for manufacturing the same.

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Vehicle seats are required to have the ability to provide good static comfort to the occupants, and have a structure that allows the occupants to maintain their naturally desired posture with the least amount of muscle activity, and which does not obstruct blood circulation. The structure must not exhibit body pressure distribution that may promote fatigue, and the level of fatigue caused by continuous sitting is also an issue, and the cushion must be soft and have excessive suspension in the seating area. Using a slightly harder pad can reduce fatigue.

FIG. 1 shows, as an example, a schematic vertical cross-sectional view of the seating part of an automobile seat, in which a foamed polyurethane pad 03 reinforced with cheesecloth is fixed to a zigzag spring 02 stretched on a frame 01. The entire upper surface is coated with 0 epidermis.
4 is covered.

On the other hand, in recent years, a structure in which the zigzag spring 02 is omitted and only the foamed polyurethane pad 03 is provided as shown in FIG. If formed, there is a problem in that it is difficult to satisfy various characteristics required for the comfort of the seating portion.

On the other hand, the entire vehicle seat can be fitted with 14 sections of front FMR.
Efforts have been made to improve comfort by making the seat height adjustable or allowing it to be placed in front of the seat, but the structure above the seat becomes complicated, especially when the 14-bar height is adopted. , it has the disadvantage of increasing in size.

+1' /
The object of the present invention is to provide a laminated resin foam as a padding material for m-frames, which eliminates the need to move the seat seating part for medium-sized vehicles up and down together with the base frame, and ensures a good wearing comfort. be.

This purpose consists of an upper soft foam layer located on the seating surface;
A lower hard foam layer that is harder than the soft foam layer, and a front end portion of the laminated resin foam that is buried in the interface between the hard and soft layers to supply gas.

This is achieved by providing a laminated resin foam formed entirely by co-expanding molding, consisting of a pouch-like body of flexible material that can be contracted by evacuation.

! "Ll Hereinafter, one embodiment of the present invention shown in FIGS. 3 to 7 will be described.

FIG. 3 shows a pad 10 used in an automobile seat seating area as a partially cutaway perspective view, and FIG. 4 shows a sectional view of the pad 10 along IV-IVI. pad 1
0 includes a soft foam layer 12 which is a seating surface layer, a hard foam 1i114 integrally joined to the soft foam layer 12 by simultaneous foaming molding, and a double foam layer at the front end (front end of the pad 10). It is formed of a bag-like body 16 made of a flexible material (eg, rubber, soft resin) that is integrally embedded in the interface of the body layers 12 and 14.

Although the bag-like body 16 is contracted in the state shown in FIGS. 3 and 4, the hard foam #! is connected to the inside of the bag-like body 16.
When air is supplied through the ventilation pipe 18 made of a flexible material (e.g., rubber, soft resin) drawn out from the pad 414, the bag-like body 16 expands according to the amount of air, and the front end seating surface of the pad 10 expands. It becomes the raised shape shown in FIG.

Therefore, the end of the ventilation pipe 18 is connected to an air supply source such as a compressor or a foot-operated air pump, and air is supplied to or exhausted from the bag-like body 16 as appropriate, so that the front end of the pad 10 @ the seat surface The height can be changed. This means that it is possible to deal with the difference in leg length of the rider H without adopting a seat structure in which the seat seating part is tilted inward in the lyI direction, and a simple structure that uses the normal seat base frame as is. This allows you to get an excellent feeling of contact under your thighs.

The mold 20 for obtaining the pad 10 is a mold F 22. It is composed of an upper mold 32 and a bag-shaped body 16 as a weir body attached to the lower mold 22. Lower mold 22
．． The upper mold 32 has mold holes (
capacity) 24.34 is formed.

The receding wall surface 2G gives the shape of the seating surface of the pad 10, and in the mold hole 24 of the portion corresponding to the front end of the pad 10, a protrusion 28 having a pair of 0-shaped pieces 30 at intervals is provided as a whole. It is protruded in an inclined position.

Then, the bag-like body 1G used as a weir body is inserted and supported in a contracted plate shape into a pair of 0-shaped pieces 30,
A part of the molding space in the mold 20 in a stationary position (see FIGS. 6 and 7) is divided into upper and lower spaces A and B, and the ventilation pipe 18 connected to the bag-like body 16 is connected to the mold. It is drawn out to the outside of 20.

In order to mold the pad 10 using the mold 20 having such a structure, after heating the mold 20 in a heating furnace, the resin foaming liquid 36 for forming the soft foam layer 12 is injected into the space B, and the space is A resin foaming liquid 38 is applied to part A to obtain a hard foam jli14 which is harder than the soft foam l1112, and the lower mold 22. Align the upper mold 32 and pour the resin foaming liquid 36.
．． 38 is foamed and hardened. As a result of this operation, a soft foam layer 1 is formed in a portion including the space B and along the wall surface of the receding wall surface 24.
A pad 10, which is an integrally molded product, is formed in which the hard foam layer 14 is filled with the hard foam layer 14 and the other part is filled with the hard foam layer 14.

Next, when the foam molded product is taken out of the mold 20, the bag-shaped body 16 integrally joined to the soft foam wa12 and the hard foam m14 is also attached. If this bag-like body 16 is formed of a hard plate and does not separate from the lower mold 22, depending on its angle of inclination, it may interfere with demolding of the foam molded product and cause local Although there is a possibility of breakage,
In this embodiment, the bag-like body 16 separates from the lower mold 22, so there is no need to worry about this.

As is clear from the above explanation, the upper soft foam layer located on the seating surface, the lower hard foam layer that is harder than the soft foam layer, and the laminated resin foam layer. The front end is embedded in the interface between the hard and soft layers, and consists of a flexible material bag-like body that can be inflated and deflated by supplying and discharging gas, and the entire body is formed by simultaneous foaming. A laminated resin foam formed by the above method and a method for manufacturing the same have been proposed.

Since the lower layer of the laminated resin foam is made of VI quality foam, it can stably support the body of the seated person against the inertial force when the vehicle is running, and the upper layer Since it is made of soft foam, the contact pressure of the seat surface against both opening parts is equalized, giving a soft and excellent contact feeling.

In addition, the height of the front end seating surface can be adjusted by supplying gas into the bag-like body embedded in the front end of the 11m1if foam to inflate it, or by discharging the gas inside the bag and causing it to contract. This has the advantage of being able to accommodate differences in the leg lengths of the occupants, and making the seat adjustable in height by using the base frame of a conventional seat that cannot be adjusted in height. Note that since the upper layer of the laminated resin foam is made of soft foam, it is easily deformed, and the bag-like body is inflated with a small amount of air to deform the soft foam layer and seat the front end. It is possible to adjust the height of the surface.

Furthermore, the bag-like body may be filled with gas or not,
It has the function of improving the rigidity of the front end of the laminated resin foam,
The body can be effectively supported against the inertial force toward the front of the vehicle.

Furthermore, in the method of the present invention, since the bag-shaped body is used as a dam plate for separately injecting the resin foaming liquid for each hard and soft foam layer into the mold, a single layer resin foam is molded. Compared to the case of burying a bag-like body inside the structure, the number of man-hours is reduced and the productivity is good.

[Brief explanation of drawings]

1 and 2 are vertical cross-sectional views showing the seating portion of a known automobile seat, and FIG. 3 is a partial sectional view of a pad according to an embodiment of the present invention used in the seating portion of an automobile seat. 4 is a sectional view taken along line rV-rV, FIG. 5 is a side view showing a state in which a resin foaming liquid is injected into the mold for resin foam molding to obtain the pad, and FIG. 6 is a sectional view taken along line rV-rV. Part of the mold for molding resin foam is missing! ! A partial perspective view, Fig. 7 shows the vt in Fig. 6.
There is a top view of the -Vll line section. 10... Pad, 12... Soft foam layer, 14...
・1iiiI! quality foam layer, 16... bag-like body, 18...
・Vent pipe, 20...Mold, 22...) Mold, 24・
...Mold hole, 26...Retreat wall surface, 28...Protrusion, 30
... U-shaped piece, 32 ... Upper mold, 34 ... Mold hole, 3
6.38...Resin foaming liquid.

Claims (2)

[Claims] (1) In a laminated resin foam used as cushioning padding for a vehicle seat seating area, an upper soft foam layer located on the seating surface and a lower hard foam layer that is harder than the soft foam layer. and a bag-like body made of a flexible material, which is located at the front end of the laminated resin foam and is embedded in the interface between the hard and soft foam layers, and which can be expanded and contracted by supplying and discharging gas. A laminated resin foam made entirely by simultaneous foaming. (2) In a method for manufacturing a laminated resin foam used as cushioning padding for a vehicle seat seating area, a pouch-like body made of a flexible material that can be expanded and contracted by supplying and discharging gas is used. This is attached to the mold wall of the lower mold molding space in a contracted state to form a weir body that divides a part of the mold molding space into two upper and lower spaces, and the two divided spaces are A resin foaming solution for producing a hard foam and a resin foaming solution for producing a foam that is softer than the hard foam are respectively injected, and after closing the upper and lower molds, From both hard and soft foam layers and a flexible material bag-like body, the foamed body is foamed and hardened, the mold is opened, and the foam molded product is taken out together with the flexible material bag-like body. A method for producing a laminated resin foam comprising: