JP3075570B2 - Headrest manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a vehicle headrest.

(Prior Art) As shown in FIGS. 9 and 10, a conventional vehicle headrest has a bag-shaped skin 70 constituting an outer shell of the headrest placed on a foaming mold 75 and a bottom surface of the skin. Insert a hollow core 77 made of a blow molded product etc. from the opening wiping part 71 of the part,
Inject the foamed resin liquid 79 into the gap between the skin 70 and the core 77,
After the injection, the opening 71 is covered with a skin cover 72 and integrally foamed.

However, in the foam molding of this type of headrest, the core 77 must be positioned and fixed in the bag-shaped skin 70, but conventionally, a double-sided adhesive tape 76 is attached to the bottom of the core 77 as shown in the figure. Then, the epidermis 70 was positioned and fixed via the tape.

However, it is difficult to position the skin 70 and the core 77 reliably, while avoiding the troublesome work of manually attaching the double-sided adhesive tape 76 to the bottom surface of the core while cutting the tape to an appropriate length. was there. In particular, in the case of a so-called retractable headrest in which the headrest body is movable in several steps with respect to the stay, since the stay hole of the skin is formed long, the positioning thereof becomes more difficult.

Further, in the conventional device, it is necessary to perform a suturing process by overlock stitching or the like after forming the end of the skin lid portion superimposed on the skin opening portion.

(Problems to be Solved by the Invention) The present invention has been proposed in view of the above-described problems, and is a method for manufacturing a headrest that can reliably and easily perform positioning and fixing of a core body in a bag-shaped skin. The purpose is to provide.

Further, the present invention proposes a method of manufacturing a headrest which can easily and beautifully perform a terminal treatment of a skin cover portion and is advantageous in cost.

(Means for Solving the Problems) That is, according to the present invention, a core is inserted into a bag-shaped skin having an opening on the bottom surface side and a lid covering the opening, and a space between the skin and the core is provided. In a method of integrally molding the headrest by injecting a foamed resin liquid, forming a positioning hole in the vicinity of the skin opening and forming a polymerization hole overlapping the positioning hole also in the lid, The bottom of the core body is formed with a projection that engages with the positioning hole and the polymerization hole, and after engaging the projection of the core with the positioning hole of the skin, the foamed resin liquid is applied. The present invention relates to a method for manufacturing a headrest, which comprises injecting, and injecting, after injection, a polymerization hole of the skin is engaged with a projection of the core body to form the headrest.

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

FIG. 1 is a perspective view of a retractable headrest according to the manufacturing method of the present invention as viewed from the bottom, FIG. 2 is a perspective view of a skin used in the present invention, and FIG. 3 is a core body also used in the present invention. FIG. 4 is a perspective view showing a state in which a core body is positioned and fixed in an epidermis, FIG. 5 is a cross-sectional view of a molding die showing its molding state, FIG. 6 is an enlarged perspective view of a skin lid portion, FIG. 7 is a perspective view of a resin plate used for the skin cover, and FIG. 8 is an enlarged sectional view of a state where the cover is superposed.

The headrest 10 shown in FIG. 1 relates to a so-called foldable headrest, and a core body 30 having a stay portion 50 movable in several steps in a bag-like outer skin 20 is integrally formed via a foamed resin layer 40. It was done. Reference numeral 25 in FIG.
Reference numeral 29 denotes a stay hole of the skin 20 (formed as a long hole so that the stay 50 can move), and 31 denotes a projection of the core 30.

Next, the manufacturing method of the present invention will be described with reference to FIGS.

As shown in FIG. 2, the bag-like skin 20 used in the present invention is formed by laminating urethane foam sheets, and is formed by sewing natural and synthetic leathers and cloths into a bag-like shape. An opening 21 for inserting the core body 30 and injecting the foamed resin liquid, and a lid 25 for covering the opening 21 are formed in 20. A plurality of positioning holes 22 are formed in the vicinity of the skin opening 21, and an overlapping hole 26 is formed in the lid 25 at a position overlapping the positioning hole 22.
Are formed.

On the other hand, the core body 30 used in the present invention is made of an injection molded article or a blow molded article of a synthetic resin, and as shown in FIG. A plurality of protrusions 31 and 3 engaged with 25 overlapping holes 26
1 is formed. In this example, the size of the protrusion 31 is 3 mm in diameter and 7 mm in height.

Then, as understood from FIG. 4, the core 30 is inserted through the opening 21 of the skin 20, and the projection 31 of the core 30 is
It penetrates and engages with the positioning hole 32 of 30. As a result, the positioning of the skin 20 and the core 30 is fixed.

Next, after the positioning and fixing of the skin 20 and the core body 30 are performed, as shown in FIG.
A foam synthetic resin liquid 41 such as a polyurethane resin is injected from 21 and a lid 25 is put on the skin opening 21 after the injection. At this time, the overlapping hole 26 of the lid 25 is engaged with and fixed to the projection 31 of the core 30. After fixing the lid 25, the lid mold 56 is set and foam molding is performed.

As described above, the skin 20 and the core 30 are formed such that the positioning holes 21 of the skin 20 and the overlapping holes 26 of the lid 25 are formed by the protrusions 31 of the core 30.
Since it is fixed and fixed to the
The positioning and fixing of the 30 can be easily and reliably performed without being shifted in the skin 20.

Next, a preferred structure of the skin cover 25 will be described with reference to FIGS.

In this embodiment, in consideration of insufficient tensile strength due to the fact that the skin lid 25 is often a thin cloth-like material, and in order to perform the finishing beautifully, the tip of the lid 25 is shown in FIG. The resin plate 35 having the through-holes 36 formed as described above is polymerized, and the polymerizing hole 26 is formed through the resin plate 35. Sixth
In the figure, an example is shown in which the front end portion of the skin member constituting the lid portion 25 is folded and fixed to the back side by a known method such as an adhesive, a high-frequency sewing machine, or a sewing machine. Reference numeral 37 denotes the fixing portion. It is preferable that the size of the through hole 36 be slightly smaller than the protrusion 31 of the core body 30 in that the protrusion 23 is securely fitted. In this embodiment, the through hole
36 has a diameter of 2.7 mm to 2.8 mm with respect to a diameter of 3 mm of the protrusion 31.

FIG. 8 is an enlarged cross-sectional view showing a state in which the lid 25 in which the resin plate 35 is provided is overlapped with the projection 31.

(Operation / Effect) As shown and described above, according to the headrest manufacturing method of the present invention, the positioning hole is provided in the vicinity of the opening of the bag-shaped skin, and the lid for covering the opening is also provided with the positioning. An overlapping hole is formed to overlap the hole, and a projection is formed on the core body so as to be engaged with the positioning hole and the overlapping hole. Since the hole and the projection are engaged with each other, the positioning and fixing of the core body in the bag-shaped skin can be performed reliably and easily.

Also, after the injection of the foamed resin liquid, since the polymerization hole of the skin cover is engaged with the protrusion to form the foam, the terminal treatment of the skin cover is easily and beautifully performed. This makes it possible to eliminate the need for a special processing step such as suturing the lid after molding as in the prior art, which is advantageous in terms of both process and cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a retractable headrest according to the manufacturing method of the present invention as viewed from the bottom, FIG. 2 is a perspective view of a skin used in the present invention, and FIG. FIG. 4 is a perspective view of a core used in the present invention, FIG. 4 is a perspective view showing a state where the core is positioned and fixed in the skin, FIG. 5 is a cross-sectional view of a molding die showing the molding state, and FIG. FIG. 7 is an enlarged perspective view of a resin plate used for a skin cover, FIG. 8 is an enlarged sectional view of a state where the cover is superimposed, and FIG. 9 is a conventional method for manufacturing a headrest for a vehicle. FIG. 10 is a cross-sectional view of a conventional vehicle headrest. 10 ... headrest, 20 ... skin, 21 ... opening, 22 ...
... Positioning hole, 25 ... Lid, 26 ... Polymerization hole, 30
... core, 31 ... protrusion, 35 ... resin plate, 36 ... through-hole, 40
... foam resin layer, 41 ... foam resin, 50 ... stay, 55 ...
... molding.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-92420 (JP, A) JP-A-62-162511 (JP, A) JP-A-63-164988 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B68G 7/06 A47C 7/38 B29C 39/10 B29K 105: 04 B29L 31:58

Claims (1)

(57) [Claims] 1. A core body is inserted into a bag-shaped skin having an opening on the bottom side and a lid covering the opening, and a foamed resin liquid is injected into a space between the skin and the core to integrate the headrest. In the method of forming into the above, forming a positioning hole near the skin opening and also forming a polymerization hole overlapping the positioning hole also in the lid portion, and the positioning hole in the core bottom surface portion Forming a projection to be engaged with the hole and the polymerization hole, engaging the projection of the core in the positioning hole of the skin, then injecting a foamed resin liquid, and then injecting the foam for polymerization of the skin. A method for manufacturing a headrest, wherein a hole is formed by engaging a hole with a projection of the core body.