JPS6024917A - Manufacture of head rest cover - Google Patents

Abstract

PURPOSE:To enable cost down to be achieved, causing mounting operation to be carried out effectively by forming together the bellow like cylindrical part covering a stay on the excessive part of the parison forming a flowing air hole. CONSTITUTION:A stay S and each valve V1, V2 are inserted into a parison P, lifting a base pedestal, and the parison P is held between left and right molds C1, C2. Then, the parison P is inserted thereinto such that an excessive part P1 is held. Compressed air is injected from the air valve V1. By this air injection, the main body 1 of a head rest cover is integrally formed with a bellow like cylindrical part 4 at the state where the air hole 2 for blowing, the injection hole 3 for foaming stock solution and additionally the stay S are being inserted into the excessive part P1 of the parison, while forming by bulding said main body 1. After these forming, the cover main body 1 is filled with the foaming stock solution from the valve V2, and it is foarmed and cured. The pad part to which the stay S is integrally fixed is molded, projecting the stay S from the cover main body 1. When the excessive part of the parison is cut off, the bellow like cylindrical part 4 covering the stay S may be integrally molded in a series.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for manufacturing a headrest cover in which the headrest cover is manufactured by blow molding a parison.

BACKGROUND ART Conventionally, when blow molding a headrest cover, a parison is formed to be longer than the dimensions required for molding the cover body to have an extra part, and the parison is inserted into the extra part in a mold and then expanded molded. In this process, air holes are formed for blowing, and compressed air is blown through the air holes to expand and mold the cover body.
After integrally foam-molding the butt part by injecting the foam stock solution into the cover body through the injection hole formed in the surplus part along with the blowing air hole, remove all unnecessary surplus parts from the cover body. It is cut out and removed to make a headrest. However, when this headrest is attached to the seat back.

If necessary, the stay is sometimes covered with a bellows-shaped cylindrical member placed between the cover body and the seat back, but the cylindrical member is completely separate from the headrest cover and the seat back skin. This is preferable because it is attached by connecting the upper and lower ends to the headrest cover and the seat back after being molded and fitted to the stays, which takes a lot of time and effort to mold and assemble, resulting in high costs. It can not be said.

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for manufacturing a headrest cover in which a serpentine layered cylinder portion covering a stay of a headrest can be molded together with a cover body.

That is, in the method for manufacturing a headrest cover according to the present invention, a bellows-shaped cylindrical portion covering the stay is formed at least on the excess portion of the parison forming the blowing air hole.

Embodiments will now be described in detail with reference to the drawings.

In the illustrated embodiment, in the same process as the blow molding of the parison, the butt part is foam-molded inside the parison, and the stay is mounted so as to protrude from the cover body.

The parison P is extruded from the gouging head D into a cylindrical shape with its lower end open, and is inserted into a split mold.

The split mold is equipped with left and right molds C, C2 that are fixed to each other via a compressed air inhabitant or gas vent valve VI + foam stock solution injection valve V2, etc., and the main body of the headrest cover is formed on each opposing surface. cavity G1 and each valve V
I.

Concave groove G2 for receiving v2. G3 is provided. Each of the valves v1 and v2 is mounted upright on a base F on which the mold CI*C2 is placed, and an air injection or suction pipe and a foam material injection pipe (not shown) are connected to the lower end of each valve. ing. In addition, a bracket) B that supports the stay S when standing is attached to the base F, and the bracket) B
A bellows-shaped concave groove G4 is provided on each surface of the molds C1+C2 so as to be able to receive the stay S supported by the molds C1 and C2.

This bracket B can be used as a valve for injecting air or for degassing as will be described later, in the same way as valve 1, and an air injection or suction pipe is also connected to its lower end.

Using this mold, first the stay S is inserted into the bladder nt B and supported by one vertical pin. The stay S may be of two legs formed integrally with a quadrilateral headrest frame, or may be of one leg, such as a T-shape. To erect the stay S, after supporting it, raise the base F using a cylinder etc.
Move the stay S and each valve V inside the parison P.
I and V2 are inserted, and the parison P is held between the left and right molds C, and C2. At this time, the parison P is inserted so as to have an extra portion PI of length that surrounds each valve vI+V2 and the bracket B in addition to the portion forming the main body 1 of the headrest cover. In addition, the parison P is a narrow-diameter cylindrical one with a slightly increased wall thickness, and its lower end is pulled from the left and right with a bar or jig to expand it into a roughly trapezoidal shape, and the stay S and each valve ], v2 should be accepted. In this case, when cutting off the upper end side of the parison P, the cutting width can be shortened, and the relatively thick portion can be thermally welded, so that the peel strength can be increased. After inserting the valves Vl, ■, and the stay S, the parison P and the surplus portion P are clamped and clamped by the mold CI*C2, and then compressed air is injected from the air valve v1. In the air injection, the main body part l of the headrest cover is bulged and the excess part P of the parison P is
In addition to the blowing air hole 2 and the foam stock solution injection hole 3, the bellows-shaped cylindrical portion 4 can be integrally formed with the stay S inserted into the blowing air hole 2 and the foam stock solution injection hole 3. A cut line is made with gold YJcI and G2 during blow molding in the surplus portion P, so that the bellows-shaped cylindrical portion 4 can be removed afterward by cutting.

After the parison P is blow-molded, a foam stock solution such as urethane is filled into the cover body l from the valve V2 and foamed and hardened. When the foam hardens, the air valve v1 acts as a gas vent hole, and the stay S protrudes from the cover body 1 to form a butt portion 5 integrally attached thereto.

After completing the foam molding of the butt part 5, the mold CI r C2
If the molded product is removed from the mold and the excess portion is cut along the cutout line formed during blow molding, the cover body 1 will have a bellows-shaped cylindrical portion 4 that covers the stay S.
can be formed in a continuous manner. The bellows-shaped cylindrical portion 4 can be connected and attached to the seat back A by fixing its lower end to a guide tube T through which the stay S is inserted. The guide tube T is fitted and fixed to a bracket H supported by the seat back frame J, and a stop plate I clamps the lower end of the bellows-shaped cylindrical portion 4 to its outer flange.
Just fix it with screws.

Effects of the Invention As described above, according to the method for manufacturing a headrest cover according to the present invention, the main body of the cover can be blow molded, and the bellows-shaped cylindrical portion covering the stay can be integrally and continuously formed. The lower end of the bellows-shaped tube only needs to be connected to the seat back, making installation extremely efficient.Moreover, since the bellows-shaped tube is provided in the excess area needed to form the air hole for blowing, the installation is extremely efficient. This also makes it possible to reduce waste of materials and reduce costs.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a mold used in the method for manufacturing a headrest cover according to the present invention, FIG. The figure shows the same assembly as an explanatory diagram showing the later parison.
FIG. 3 is a perspective view showing a semi-finished headrest manufactured by the method according to the present invention, FIG. 4 is a perspective view showing a completed headrest, and FIG. 5a is a finished headrest according to another embodiment. FIG. 5 is a side sectional view of the headrest, and FIG. 6 is a partially enlarged sectional view of the serpentine 1M-shaped cylindrical portion of the headrest connected and attached to the seat back. P: parison, Pl: surplus, S Nischi. l: 1 main body, 2 air holes for nibrow, 4: bellows-shaped cylinder part.

Claims (1)

[Claims] A headrest characterized in that when a headrest cover is formed by blow molding a parison, a bellows-shaped cylindrical part covering a stay is integrally molded with the cover body at least in the surplus part of the parison forming the blowing air hole. How to manufacture the cover.