JPH04170988A - Manufacture of head rest - Google Patents

Abstract

PURPOSE:To surely, simply and easily position and fix a core body in the bag- like skin by forming a positioning hole part in the vicinity of an opening part of the skin and a cover part so as to be superposed, and forming a projecting part detained and attached to them in the bottom face part of the core body. CONSTITUTION:A core body 30 is inserted from an opening part 21 of the skin 20, and a projecting part 31 of the core body 30 is allowed to pass through a positioning hole part 32 of the skin 30 and detained and attached thereto. Subsequently, by a forming mold 55, a foam synthetic resin liquid 41 of a polyurethane resin, etc., is injected from the opening part 21 of the skin, and after it is injected, a cover part 25 is placed on the opening part 21 of the skin. In this case, a superposing hole part 26 of the cover part 25 is fixed by detaining and attaching it to the projecting part 31 of the core body 30.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a vehicle headrest.

(Prior Art) As shown in FIG. 9 and FIG. 1O, a conventional headrest for a vehicle is manufactured by placing a bag-shaped skin 70 constituting the outer shell of the headrest on a foam mold 75, and then inserting the bottom surface of the skin into a foam mold 75. A hollow core body 77 made of a blow-molded product or the like is inserted through the opening 71 of the section, and the foamed resin liquid 7 is inserted into the gap between the skin 70 and the core body 77.
9 is injected, and after the injection, the opening 71 is covered with a skin lid 72 and integrally foam-molded.

However, in foam molding of this type of headrest, it is necessary to position and fix the core body 77 within the bag-like skin 70. Conventionally, as shown in the figure, double-sided adhesive tape 76 is pasted on the bottom surface of the core body 77. The epidermis 70 was positioned and fixed through the tape.

However, not only is the work of cutting the double-sided adhesive tape 76 to an appropriate length and pasting it manually to the bottom of the core body complicated, but it is also difficult to position the skin 70 and the core body 77 reliably. There was a problem. In particular, in the case of so-called foldable headrests in which the headrest main body is movable in several stages relative to the stays, the stay holes in the skin are long and therefore positioning becomes more difficult.

In addition, in the conventional method, it was necessary to stitch the end of the skin lid portion overlapped with the skin opening after molding, using overlock stitching or the like.

(Problems to be Solved by the Invention) This invention has been proposed in view of the above-mentioned problems, and is a method for manufacturing a headrest that can reliably and easily position and fix the core within the bag-like skin. The purpose is to provide the following.

Further, the present invention proposes a manufacturing method for a headrest that allows the end treatment of the skin lid portion to be performed simply and beautifully, and is advantageous in terms of cost.

(Means for Solving the Problems) That is, in the present invention, a core body is inserted into a bag-like skin having an opening on the bottom side and a lid that covers the opening, and a core body is inserted into a space between the skin and the core body. In a method of integrally molding a headrest by injecting a foamed resin liquid, forming a positioning hole in the vicinity of the skin opening, and forming an overlapping hole in the lid that overlaps with the positioning hole; A protrusion that engages with the positioning hole and the polymerization hole is formed on the bottom surface of the core, and after the protrusion of the core is engaged with the positioning hole of the skin, a foamed resin liquid is applied. A method of manufacturing a headrest is provided, which comprises: injecting the resin, and, after the injection, molding the polymerization holes of the skin by engaging them with the protrusions of the core.

(Example) The present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a perspective view of a foldable headrest manufactured by the manufacturing method of the present invention, viewed from the bottom; Fig. 2 is a perspective view of the skin used in the invention; and Fig. 3 is a core body also used in the invention. FIG. 4 is a perspective view showing a state in which the core is positioned and fixed within the skin, FIG. 5 is a sectional view of the mold showing its molding state, and FIG. 6 is an enlarged perspective view of the skin lid. FIG. 7 is a perspective view of a resin plate used for the skin lid, and FIG. 8 is an enlarged sectional view of the lid in a state where they are overlapped.

The headrest 10 shown in FIG. 1 is related to a so-called foldable headrest, in which a core body 30 equipped with a stay part 50 that can move in several stages is molded into a bag-like skin 20 via a foamed resin layer 40. It is what was done. Code 2 in Figure 1
5 is a lid portion of the skin 20; 29 is a stay hole in the skin 20 (the stay 50 is formed to be long so that it can be moved); and 31 is a protrusion on the core body 30.

Next, the manufacturing method of the present invention will be explained with reference to FIGS. 2 to 5.

As shown in FIG. 2, the bag-like skin 20 used in the present invention is made by laminating urethane foam sheets and sewing natural or synthetic leather, fabric, etc. into a bag shape. An opening 21 for inserting the core 30 and injecting the foamed resin liquid, and a lid 25 for covering the opening 21 are formed in the opening 2o. A plurality of positioning holes 22 are formed near the epidermal opening 21,
Further, an overlapping hole 26 is formed in the lid portion 25 at a position overlapping with the positioning hole 22 .

- On the other hand, the core body 30 used in the present invention is made of an injection molded or blow molded product of synthetic resin, and as shown in FIG.
2 and a plurality of protrusions 31, 3+ that engage with the overlapping hole 26 of the lid 25 thereof are formed. In this example, the size of the protrusion 31 is 3+nm in diameter and 7iun in height.
is formed.

Then, as understood from FIG. 4, the core body 30 is inserted through the opening 2 of the skin 20, and the protrusion 3
1 is passed through the positioning hole 32 of the skin 30 and is engaged. As a result, the outer skin 20 and the core body 30 are positioned and fixed.

Next, after the outer skin 20 and the core body 30 are positioned and fixed, a foamed synthetic resin liquid 41 such as polyurethane resin is injected from the opening 21 of the outer skin using a mold 55, as shown in FIG. After injection, cover the epidermal opening 21 with the lid 25. At this time, the overlapping hole 26 of the lid 25 is engaged with the protrusion 31 of the core 30 and fixed. After the lid part 25 is fixed, a lid mold 56 is set and foam molding is performed.

As mentioned above, the skin 20 and the core 30 are fixed by being engaged with the positioning hole 21 of the skin 20 and the overlapping hole 26 of the lid 25 or the protrusion 31 of the core 30, so that foam molding is not possible. At this time, the core i0 does not shift within the skin 20, and its positioning and fixing can be easily and reliably performed.

Next, a preferred structure of the skin lid portion 25 will be explained according to the drawings from FIG. 6 onwards.

In this embodiment, in consideration of the fact that the skin lid part 25 is often made of a thin cloth-like material and therefore does not have sufficient tensile strength, and in order to finish it beautifully, a seventh
A resin plate 35 in which a through hole 36 as shown in the drawing is formed is overlapped to form a polymerization hole 26 passing through the resin plate 35. In the 6th episode, an example is shown in which the tip of the skin member constituting the lid part 25 is folded over and fixed to the back side using a known method such as an adhesive, a high-frequency sewing machine, or a sewing machine. Reference numeral 37 indicates the part where the stopper is attached. It is preferable that the size of the through hole 36 be slightly smaller than the protrusion 31 of the core body 30 so that the protrusion 23 can be securely fitted therein. In this embodiment, the through hole 36 is formed to have a diameter of 27° to 2.8° relative to the diameter of the projection 31.

FIG. 8 is an enlarged sectional view showing a state in which the lid portion 25 having a resin plate 35 therein is superimposed on the protrusion 31.

(Operations/Effects) As illustrated and explained above, according to the headrest manufacturing method of the present invention, the positioning hole is provided near the opening of the bag-like skin, and the positioning hole is also provided in the lid that covers the opening. A polymerization hole is formed that overlaps the positioning hole, and a protrusion that engages with the positioning hole and the polymerization hole is formed on the core. Since the positioning hole and the protrusion are engaged with each other, the positioning and fixing of the core within the bag-like skin can be performed reliably and easily.

Furthermore, after the foamed resin liquid is injected, the polymerization hole of the skin lid part is engaged with the protrusion and foam molded, so the end treatment of the skin lid part can be done easily and beautifully. This eliminates the need for special processing steps such as sewing the lid after molding, which is required in the past, which is advantageous both in terms of process and cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a foldable headrest manufactured by the manufacturing method of the present invention, viewed from the bottom; Fig. 2 is a perspective view of the skin used in the invention; and Fig. 3 is a core body also used in the invention. FIG. 4 is a perspective view showing a state in which the core is positioned and fixed within the skin, FIG. 5 is a sectional view of the mold showing its molding state, and FIG. 6 is an enlarged perspective view of the skin lid. FIG. 7 is a perspective view of a resin plate used for the skin lid, and FIG. 8 is an enlarged sectional view of the lid in a state where they are overlapped. lO...headrest, 20...epidermis, 21...
Opening part, 22... Positioning hole part, 25... Lid part,
26... Hole for polymerization, 30... Core body, 31... Projection, 35... Resin plate, 36... Through hole, 40... Foamed resin layer, 41... Foaming Resin, 50... Stay, 5
5... Molding mold.

Claims (1)

[Claims] A core is inserted into a bag-like skin having an opening on the bottom side and a lid covering the opening, and a foamed resin liquid is injected into the space between the skin and the core to form a headrest. In the integral molding method, a positioning hole is formed in the vicinity of the skin opening, and an overlapping hole that overlaps the positioning hole is formed in the lid, and the positioning hole is formed in the bottom of the core body. forming a protrusion that engages with the positioning hole and the polymerization hole, and after the protrusion of the core body is engaged with the positioning hole of the outer skin, a foamed resin liquid is injected, and after the injection, the outer skin is polymerized. A method for manufacturing a headrest, characterized in that the hole portion is molded by being engaged with the protrusion of the core body.