JPH0443765B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method of manufacturing seats for vehicles, etc.
In particular, the present invention relates to an improvement in the method of manufacturing a seat formed by integrally molding a frame and a foam pad.

In recent years, for vehicles, especially automobile seats, a method has been proposed in which the frame and pad made of synthetic resin foam are integrally molded to meet the demands for improved appearance quality, improved productivity, reduced costs, and reduced weight. There is.

Here, for example, members such as the headrest stay and the reclining tightening part are installed at positions that are inserted into the foam pad, but since these members such as the headrest stay are long and narrow,
It has been difficult to form an elongated cavity into which a headrest stay or the like can be inserted using a foam pad mold.

Therefore, in the past, it was necessary to process and form the elongated cavity after the completion of molding of the foam pad, which required additional processing man-hours and had the problem that the finished state was not always satisfactory. Ta.

On the other hand, the elongated hollow part of the foam pad,
Molding using a slide core or the like may be considered, but the cost of the mold is high, and the foamed synthetic resin agent tends to get into the sliding portion of the slide core, making the sliding portion unable to slide. There is a point.

On the other hand, a core corresponding to the required elongated cavity in the sheet is fixed to a frame, the core and frame are set in a mold, and a foamed synthetic resin agent is injected into the mold. and foaming to form a foam pad integral with the core and frame, and after completion of molding, remove the core and fill the elongated cavity in the foam pad formed by the core. A possible method is to insert an elongated member and attach it to the frame to form the elongated cavity without post-processing.

However, this method of manufacturing a seat using a core requires the work of attaching and detaching the core to the seat frame each time the mold is used.
Furthermore, in order to facilitate the mold release of the core from the foam, treatment with a mold release agent is also required, resulting in the problem of a large number of work steps.

Furthermore, there is a problem in that the core and the mold release agent themselves increase manufacturing costs.

In addition, in the above sheet manufacturing method, a headrest support for supporting a headrest stay, for example, is attached to the elongated hollow portion after the core is extracted, but the headrest stay is axially disposed relative to the headrest support. Therefore, if the headrest support is not firmly supported, there is a problem that the headrest support is likely to become loosely fastened to the seat frame and cause so-called looseness.

This invention has been made in view of the above-mentioned problems, and provides a method for manufacturing a seat that reduces the number of work steps and can firmly support a head rest support without using a core. The purpose is to

The present invention provides a method for manufacturing a seat, in which a seat frame is set in a mold, and a foamed synthetic resin agent is injected into the mold and foamed to form a foam seat pad integral with the seat frame. A bottomed cylindrical body made of synthetic resin capable of housing a headrest stay is attached to the seat frame, and the opening side of the outer cylindrical body is placed in close contact with the inner wall surface of the mold, and the molding By foam-molding the seat pad integrally with the seat frame and the cylindrical body in a mold, the headrest stay storage portion is integrally formed during foam-molding of the seat pad, thereby achieving the above object.

Further, the present invention provides the synthetic resin bottomed cylindrical body,
By using a headrest support that supports the headrest stay so that it can slide in the axial direction, the synthetic resin bottomed cylindrical body doubles as a sheet during foam molding of the seat pad, thereby achieving the above object. It is something.

Further, in the present invention, a flange-like member is integrally provided at the outer end of the cylindrical body and extends along the inner wall surface of the mold, thereby making the sealing of the cylindrical body more reliable and also improving the sealing of the head. The above object is achieved by increasing the strength of the end portion on the insertion side of the rest stay.

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIG. 1, a seat frame 1 is set in a mold 2, and a foamed synthetic resin agent is injected into the mold 2 and foamed. In a seat manufacturing method for forming an integral foam seat pad 3, a bottomed cylindrical body 5 made of synthetic resin capable of housing a headrest stay 4 is attached to the seat frame 1, and the cylindrical body 5 is The opening 5A side is placed in close contact with the inner wall surface 2C of the mold 2, and the seat pad 3 integral with the seat frame 1 and the cylindrical body 5 is foam-molded within the mold 2.

Reference numeral 2A in the figure indicates the upper die of the mold 2, and 2B indicates the lower die.

Here, the bottomed cylindrical body 5 is attached to the seat frame 1, and in particular, to prevent the seat frame 1 from moving within the mold 2.
In order to prevent the foamed synthetic resin agent from moving due to the pressure during injection, it is fixed in the mold using conventionally known fixing means such as presser pins and receiving plates (both not shown) provided on the upper and lower molds. It is firmly fixed.

Therefore, the bottomed cylindrical body 5 fixed to the seat frame 1 is also firmly fixed in close contact with the inner wall surface 2C of the mold 2.

When the seat pad 3 is integrally foam-molded with the cylindrical body 5 and the seat frame 1 as described above, since the cylindrical body 5 is made of synthetic resin, the seat pad 3, which is also made of synthetic resin (for example, urethane) foam, is 3, and the two are surely integrated.

Further, the cylindrical body 5 has a bottom, and the opening 5
Since A is in close contact with the inner wall surface 2C of the mold 2,
When foam-molding the seat pad 3, the foamed synthetic resin agent does not enter into the cylindrical body 5.

After the molding of the seat pad 3 is completed, the seat pad 3 is taken out from the mold 2 and the seat skin 6 is attached as shown in FIG. Complete it as a head rest support.

Therefore, according to the method of this embodiment, the cylindrical body 5 as a headrest support can be integrally formed at the same time during foam molding of the seat pad 3 without using a core and without requiring installation work in a subsequent process. Can be installed on.

Further, in this embodiment, the cylindrical body 5 is firmly connected to the seat frame 1 in advance, and is also integrally connected to the seat frame 1 by the seat pad 3 that is integrally attached to the surface of the cylindrical body 5. Since it is firmly supported by the cylindrical body 5, the cylindrical body 5 will not loosen.

In particular, in this embodiment, as shown in the figure, the end surface of the opening 5A of the bottomed cylindrical body 5 is inclined in correspondence with the inclined inner wall surface 2C of the mold 2, so that the mold of the seat frame 1 is 2, the opening 5A is pressed against the inner wall surface 2C due to the force of the upper mold 2A pressing down on the seat frame 1 and gravity, so that the close contact of the cylindrical body 5 to the inner wall surface 2C is strengthened. will be done.

Next, a second embodiment of the present invention shown in FIG. 3 will be described.

In this second embodiment, a flange-like member 8 is integrally provided at the outer end of the cylindrical body 5 and extends along the inner wall surface 2C of the mold 2.

In the case of this embodiment, since the contact area of the outer end of the cylindrical body 5 to the inner wall surface 2C of the mold 2 through the brim member 8 is increased, the seat pad 3
During the foam molding process, the sealing becomes more reliable, and therefore, the intrusion of the foamed synthetic resin agent into the cylindrical body 5 is more reliably prevented.

Moreover, the flange-like member 8 is attached to the seat pad 3 after the molding is completed.
Since it spreads along the surface of the seat pad 3 and the cylindrical body 5, it strengthens the connection part between the seat pad 3 and the cylindrical body 5.
There is an advantage that the rigidity of the cylindrical body 5 itself can be increased.

In the above embodiment, the cylindrical body 5 itself formed integrally with the seat pad 3 is connected to the head rest stay 4.
However, the present invention is not limited to this.
The cylindrical body may be made of synthetic resin as long as it can accommodate the headrest stay directly or indirectly.

Therefore, for example, a metal headrest support may be attached to the inside of the cylindrical body 5.

Furthermore, although the above embodiments relate to a method for manufacturing a vehicle seat, the present invention is also applicable to seats in aircraft, ships, etc.

Since the present invention is configured as described above, the headrest stay storage portion can be integrally formed with the seat frame and the seat pad in a simple process without using a core, and therefore,
This has the excellent effect of simplifying the manufacturing process, reducing costs, and improving quality.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing the process of manufacturing a sheet by the method of manufacturing a sheet according to the present invention, and FIG. 3 is a cross-sectional view showing the process of manufacturing a sheet by the method of the second embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Seat frame, 2... Molding die, 2C... Inner wall surface, 3... Seat pad, 4... Headrest stay, 5... Cylindrical body, 5A... Opening, 8... Flange-shaped member.

Claims (1)

[Claims] 1. Manufacture of a seat by setting a seat frame in a mold, injecting a foaming synthetic resin into the mold and foaming it to form a foam seat pad integral with the seat frame. In the method, a bottomed cylindrical body made of synthetic resin capable of accommodating a head rest stay is attached to the seat frame,
A seat characterized in that the opening side of the cylindrical body is placed in close contact with the inner wall surface of the mold, and a seat pad integral with the seat frame and the cylindrical body is foam-molded within the mold. manufacturing method. 2. The method of manufacturing a seat according to claim 1, wherein the bottomed cylindrical body made of synthetic resin serves as a headrest support that supports a headrest stay so as to be slidable in the axial direction. 3. The method according to claim 1 or 2, wherein the cylindrical body is integrally provided with a flange-like member extending along the inner wall surface of the mold at its outer end. Method of manufacturing sheets.