JPS6124429A - Manufacture of headrest - Google Patents

Abstract

PURPOSE:To enable to manufacture a headrest, the front side and the rear side of the covering body of which is different in color and which has a hole to see through, by a method wherein the covering body made of blow-molded PVC is divided into two side pieces and, after sandwiching padding therebetween, joined again in order to solvent-weld. CONSTITUTION:Firstly, a part 4, which is projected by bending in outwardly convex, is formed along the periphery of a covering body on the parting face C of a mold. Secondly, a front and a rear halved covers 5 and 6 are produced by cutting the covering body vertically at the position inside the parting face C along the imaginary line XX' shown in the attached figure. Thirdly, a plastic foam-molded object 7, in which stays 2 are inserted, is housed in the front halved cover 5 as padding. Fourthly, the halved cover 6 for the side opposite to the cover 5 is put upon the cover 5. Finally, the end edge parts 8 developed by cutting-off of the projected part are joined in order to bind and finish the parts with a high-frequency welding device.

Description

[Detailed Description of the Invention] "Objective of the Invention" (Industrial Application Field) This invention adds a specific processing step to a method for manufacturing a spatula-dishing strike by blow molding vinyl chloride resin (hereinafter referred to as PVO). This invention relates to a method for easily manufacturing complex headrests, such as those with perforated shapes and those with two different colors on the front and back.

(Prior Art) Conventionally, in the manufacture of headrests, a method has been used in which a polyurethane stock solution is injected into a part of a cover material made of blow-molded PvO and foamed. As shown in FIG. 5, (a) a notch 10 as shown in the figure is provided at the bottom of the cover body 3 made of blow-molded PVO as shown in the figure (0), and (c) the headrest is placed on the seat as shown in the figure. When the two stays 2 are made to protrude from the bottom of the cover body 3 for support, the left and right legs 11 of the frame core 9 inserted inside the cover body are formed and finished by injecting a polyurethane stock solution and foaming. Ta. Therefore, there is a disadvantage that if foaming fails, not only the inside but also the skin material will be damaged. Furthermore, when manufacturing skin materials of different colors, it is not possible to change the color on the molding surface because the colors will mix, and furthermore, it is impossible to manufacture a perforated headrest that can be seen through.

(Problems to be Solved by the Invention) The present invention is a manufacturing method that can be applied to various types of items such as those mentioned above. A method has been developed in which the joining protrusions are created and then cut and removed after the joining process is completed.

"Structure of the Invention" (Means for Solving the Problems) This invention solves the above problems by dividing the cover body made of blow-molded PVO, sandwiching the filling like a sandwich, and joining and welding it again. This is the manufacturing method. The basic structure is that during the blow molding process of the headrest cover body, a protrusion is formed by making the skin protrude outward in a convex shape along the peripheral surface that contacts the molded surface. Cut the protrusion and make a half-cut cover in advance. When making a young cover body with different colors on the front and back sides, you can prepare half-cut cutters in different colors. Next, a plastic molded foam into which a stay separately formed to protrude from the frame core is inserted is housed inside the half-cut cover as a filler, and the half-cut cover on the opposite side is placed on top of the half-cut cover, and the joints are connected by welding. A cover body having a perforated shape can also be easily joined and manufactured by this method. (Function) The function of the present invention is that when blow molding a headrest having complicated shape specifications, the cover body is cut and prepared as a half-cut cover, and the necessary contents are sandwiched and the half-cut cover is joined. Since the manufacturing method involves welding and finishing at the parts, half-cut covers with different colors on the front and back can be made and joined together, so it is possible to finish items with different colors beautifully without the fear of color unevenness on the cracked surface as in the past.
In addition, since the molded plastic foam with the stay inserted is made separately and combined with the half-cut cover, there is no need to worry about the whole being defective due to poor foaming. It has become possible to easily manufacture things.

(Example) An example of the present invention will be described below based on the drawings. Figure 1 illustrates the manufacturing process according to the present invention in comparison with a conventional method. 2
This is a headrest 1 with a main protrusion.

In the (-) figure where the cover body 3 is cut at the A and A' planes shown on the outside, the conventional product has a mold along the periphery in the enlarged view of the B part as shown in the figure (C). It has a split surface 0 in the vertical direction.

In this process, (d) a convex curved protrusion 4 is formed outward along the periphery of the rough-cut surface 0 as shown in the figure, and the inner side of the mold-cut surface 0 is formed as shown by the imaginary line XX'. A molded plastic foam 7 with the stay 2 inserted therein is housed inside the half-cut covers 5 and 6 on the front and back sides created by vertical cutting, and is used as a filling material by overlapping the half-cut cover 6 on the opposite side to form a protrusion. The end edges 8 produced by cutting the parts are joined and finished by applying high frequency welding equipment.

2 to 4 show examples of perforated headrests manufactured by this manufacturing method. To easily form a perforated headrest having a structure in which a frame core 9 incorporating a stay inserted as a leg part into a molded plastic foam 7 as a filler is inserted inside a cover body of a headrest. 0 "Effects of the Invention" Since this invention is the method described above, it has the following advantages.

(1) Due to the manufacturing method of overlapping and joining half-cut covers, it is possible to manufacture a two-color headrest by joining the two-color headrest without mixing different colors on the front and back sides at the boundary between the molded surfaces.

(2) Compared to foam molding inside the cover body, plastic molded foam can be used separately molded in advance, contributing to stabilization of quality.

(8) Particularly convenient for perforated types and good workability.

[Brief explanation of drawings]

Figure 1 is a comparative illustration of the additional manufacturing process, Figure 2 is an explanatory diagram (front view) of the perforated headrest, and Figure 3 is the same as above (
8), FIG. 4 is the same as above (bottom view), and FIG. 5 is an explanatory diagram of the conventional manufacturing process. (Explanation of the symbols of the main parts) 1: Headrest 2 Varnish Tee 3: Cover body 4: Protrusion 5: Half-cut cover 6: Half-cut cover (opposite side) 7: Plastic molded foam 0: Divided surface

Claims (1)

[Claims] A half-cut cover that is formed by forming a convex curved protrusion outward along the periphery of the molding surface in the manufacturing process of a cover body made by blow molding vinyl chloride resin, and cutting the protrusion after molding. A method for manufacturing a headrest, characterized in that a molded plastic foam with a stay inserted therein is housed as a filling, the half-cut cover on the opposite side is placed over the joint, and the joint is joined using a welding device.