JPH0239982B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for manufacturing a headrest.

[Conventional technology]

Conventional head rests require and are usually provided with supporting legs to be attached to the backrest of the chair, but these supporting legs are generally made of metal or synthetic resin and are flat or hollow and are embedded within the headrest body. Those fixed to a shaped reinforcing core are widely used. Therefore, this headrest requires a step of fixing the support leg and the reinforcing core, and since the core and the support leg are made of completely different members, the product itself tends to be expensive. Therefore, in order to improve this, a core body made by bending a rod-shaped material and a core body whose both ends are extended to integrally form a pair of support legs are used, and the core part is placed inside a hollow outer skin. It has been proposed that the middle part of the outer skin be filled with foam. One specific method for manufacturing such a headrest is as follows:
As shown in Japanese Patent Application Laid-open No. 55-158944, a pair of half-split molds with a cavity formed on the inner wall that matches the external shape of the headrest is prepared, and the half-split molds are opened and the extruder is removed during this period. By letting the cylindrical parison fall in an extruded manner, then inserting the core frame part of the core body into the lower opening of the parison to close the half mold, and blowing air from the air blowing pipe. A predetermined bag-like outer skin is formed, and at this time a hole for an air blowing pipe is formed in the outer skin. Then, the bag-shaped outer skin is placed in a mold for foam molding, and the foam stock solution is injected through the hole by using the hole as an injection port to complete the molding. However, since the injection port formed by this method is extremely small, leakage due to the foaming reaction of the foaming stock solution after injection is prevented to a minimum;
There was a problem with the process of injecting the foaming stock solution. For this purpose, the actual situation is to insert a watering funnel into the injection port and inject the foaming stock solution.

[Problems to be solved by the invention]

The present invention aims to improve the above-mentioned points, and focuses particularly on the formation of the injection port, and by fixing a partition plate to the air blowing pipe, it not only minimizes the leakage of the foaming stock solution, but also minimizes the leakage of the foaming stock solution. The purpose of this is to form an injection port that is easy to inject.

[Means to solve the problem]

That is, the feature of the present invention is that an air blowing pipe is inserted into the substantially central part of the support plate, and a partition plate is attached to the pipe portion protruding from the support plate so as to be in the same direction as the longitudinal direction of the support plate. Furthermore, after a core consisting of a reinforcing part and supporting legs connected to the reinforcing part is removably installed on the support plate, the reinforcing part of the core is inserted into the parison and blow molding is performed, and the partition is placed on the parting line. A headrest in which a hollow headrest skin body containing a core is provided with a protruding opening injection part corresponding to the width of a board, and then the injection part is opened to inject a foaming stock solution into the skin body to perform foam molding. It is in the manufacturing method.

【Example】

Hereinafter, the method of the present invention will be further explained in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing the manufacturing process of the method of the present invention, in which a pair of half-split molds 1, 1 having a cavity formed on the inner wall surface that matches the outer shape of the headrest is prepared; On the lower facing surface, a fitting groove 2 of the support leg and a recess 3 of a partition plate described later are provided between the fitting grooves 2 of the supporting legs. And the above half-split mold 1,
1 is open, a cylindrical parison 5 extruded from the extrusion die 4 and made of synthetic resin such as polyvinyl chloride or ABS resin is falling. In this state, a core body 8 consisting of a reinforcing part 6 and a pair of supporting legs 7, 7 connected to the reinforcing part 6 is attached to the cylindrical parison 4.
The core body 8 is inserted through the bottom opening 9 of the
The support legs 7, 7 are attached to the mounting portion 1 fixed to the support plate 10.
1 is removably installed. An air blowing pipe 1 is installed approximately in the center of the support plate 10.
2 is inserted through the supporting plate 10.
A partition plate 13 having the same width as the diameter of the pipe 12 is fixed to the pipe 12 on the part of the pipe that protrudes from the pipe 12, and the surface of the partition plate 13 faces the molds 1, 1. . The core fixing jig 14 configured in this manner is fixed in position with the reinforcing portion 6 of the core 8 entering the parison 4, and the half-split molds 1, 1 at approximately 40 to 60°C are closed. After that, connect air blowing pipe 1
Blow molding is completed by introducing compressed air of 1 to 6 kg/cm ² from Step 2. Thus, after blow molding, half mold 1,
1 is opened, the hollow skin body 15 for headrest is removed from the mold, and the support plate 10 is removed. The hollow skin body 15 for headrest thus obtained has a built-in core body 8 as shown in FIG. At the same time, there is a parting line between the support legs 7 and 7.

[PL] Injection part 1 of the same type as the partition plate 13 on top
6 is molded. This injection part 16 has an opening that communicates with the hollow part of the epidermis. Therefore, next, the hollow skin body 15 for the headrest is housed in an openable/closable split mold 17 for foam molding.

[See FIG. 3] A foaming solution such as polyurethane is injected by forcibly opening the injection part 16, and then the mold is clamped to press the injection part 16 into place.

[See FIG. 4] Foam molding is performed in this state, and after the foam molding is completed, the injection part 16 is trimmed as shown in FIG.

【Effect of the invention】

As described above, the method of the present invention includes attaching a partition plate to the support plate in addition to the air blowing pipe protruding from the support plate to form a foaming stock solution injection port,
After that, since foam molding is performed, the injection port for the foaming stock solution is made to be a relatively wide injection port.
Moreover, since this injection port protrudes from the surface of the skin body, it not only makes it easier to inject the foaming stock solution, but also makes it easy and reliable to clamp the foaming mold after injection of the foaming stock solution, making it possible to leak the foaming stock solution. This method significantly simplifies the foaming liquid injection process, which was one of the difficulties in conventional headrest manufacturing, and greatly contributes to its improvement.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing the manufacturing process of the hollow skin of the headrest in the method of the present invention, and Fig. 2 is a view from the bottom side of the hollow skin of the headrest in the manufacturing process of Fig. 1. A perspective view, Fig. 3 is an explanatory cross-sectional view when the hollow skin body is housed in a mold for foam molding, Fig. 4 is an explanatory cross-sectional view when foam molding is completed, and Fig. 4 is an explanatory cross-sectional view when foam molding is completed. FIG. 5 is a perspective view of the headrest viewed from the bottom side after the injection portion of the headrest has been trimmed. 1...Mold, 5...Parison, 6...Reinforcement part,
7... Support leg, 8... Core body, 9... Bottom opening, 1
0... Support plate, 11... Mounting part, 12... Air blowing pipe, 13... Partition plate, 15... Skin body, 16... Injection part.

Claims (1)

[Claims] 1. An air blowing pipe is inserted into the approximate center of the support plate, and a partition plate is fixed to the pipe portion protruding from the support plate in the same direction as the longitudinal direction of the support plate. Furthermore, after a core consisting of a reinforcing part and supporting legs connected to the reinforcing part is removably installed on the support plate, the reinforcing part of the core is inserted into the parison and blow molding is performed, and the partition is placed on the parting line. forming a hollow skin body containing a core having a protruding opening injection part corresponding to the width of the board, then injecting a foaming stock solution into the skin body by opening the injection part of the hollow skin body; A method for producing a headrest, which comprises then compressing the injection part and foam-molding it.