JPH0376205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention provides a method for inserting a part of an insert into a parison during molding of a skin of a headrest into which a part of an insert consisting of a reinforcing body part and a stay part is inserted. Then, compressed air is blown into the parison through this stay protruding from the parison, and the parison is blow-molded into the shape inside the mold to obtain a skin. It does not have an opening for blowing compressed air, which would increase the number of steps and further spoil the appearance of the head rest.

(Background of the Invention) FIG. 1 is a partially cutaway perspective view of a headrest, showing the structure of the headrest. The headrest is composed of a stay portion 1 for attaching the headrest to a seat, a reinforcing body portion 2 for withstanding impact force, a cushion body 3 for softening the impact force, and an outer skin 4. The stay portion 1 and the reinforcement portion 2 are joined together and are generally referred to as an insert. Parts of this insert, primarily the reinforcing body part, are inserted into the skin during or after molding of the skin. However, in order to insert part of the insert into the epidermis after shaping the epidermis, it is necessary to cut open a part of the epidermis, which complicates the work and makes the incision wide enough to disturb the appearance. Therefore, a method in which a part of the insert is inserted into the skin during molding of the skin is preferred.

The perspective view in Figure 2 is for explaining the conventional method of inserting a part of the insert into the skin during molding of the skin, in other words, the method of molding the skin of a headrest in which a part of the insert is inserted inside. It is. In this method, the parison 6 extruded from the molding machine 5
is cut in the longitudinal direction to form an opening 6a for insert insertion, and a part of the insert, that is, the stay part 1 and the reinforcement part 2, is inserted into the parison through this opening 6a, and then compressed air is blown into the parison. Device 7
is charged into the parison through the opening 6a, the mold 8 consisting of a split mold is closed, compressed air is blown into the parison from the compressed air blowing device 7, and blow molding is performed to form the skin.

FIG. 3 is a perspective view of the skin of the headrest formed in this manner and with a portion of the insert inserted therein. The outer skin 4 is formed with an opening 4a used for blowing the compressed air.

Thereafter, a foamed synthetic resin raw material for forming a cushion body is injected into the skin 4, and the headrest is manufactured. The injection position of the foamed synthetic resin raw material has a large influence on the foaming state of the foamed synthetic resin raw material, so the shape of the headrest, the shape of the reinforcement part,
The optimum position is determined by factors such as the shape of the stay portion and the type of foamed synthetic resin raw material. Therefore,
The opening 4a used for blowing the compressed air formed during the molding of the skin could not be used as an injection port for the foamed synthetic resin raw material, so a new injection opening was formed and the raw material was injected. The injection is made using a suitable opening. For this reason, during injection and foaming of the foamed synthetic resin raw material, the opening 4a used for blowing the compressed air must be covered with adhesive tape or the like to prevent the foamed synthetic resin raw material from leaking out of the epidermis. , the number of steps will increase. Furthermore, even after the headrest is manufactured, the cushion body, which is different in color from the outer skin, can be seen through the opening 4a used for blowing compressed air, which is unfavorable in terms of appearance. There were also problems in that restrictions were added to the design of the mold, such as shaping the mold, there was less freedom in design, and the manufacturing cost of the mold increased.

(Object of the Invention) As mentioned above, the object of the present invention is to provide an insert that does not have an opening used for blowing compressed air, which causes various problems that cannot be eliminated in conventional molding methods. An object of the present invention is to obtain a method for molding the skin of a headrest in which a portion of the headrest is charged.

(Structure of the invention) Perspective views of FIGS. 4, 5, and 7 and 6
The cross-sectional views in FIG. 8 and FIG. 8 illustrate one embodiment of the molding method of the present invention. Hereinafter, the present invention will be explained in detail based on these figures.

(a) Formation of an opening for insert insertion (FIG. 4) As shown in FIG. 4, the parison 9 extruded from the molding machine 5 is longitudinally cut open by the cutting device 10 to form an opening 9a.

(b) Inserting a part of the insert into the parison (Figs. 5 and 6) As shown in Fig. 5, it is made of a metal pipe-shaped stay part 11 and a synthetic resin, and has a compressed air outlet 12a. A part of the insert, mainly the reinforcing body part, to which the hollow reinforcing body part 12 is connected is inserted into the parison 9 through the opening 9a. Figure 6 is a cross-sectional view of this insert.
It is cut along the cutting line--line in the figure. The insert is located at the end A of the stay portion 11.
This is a communication structure in which the air blown in from the reinforcing body portion is blown out from the compressed air outlet 12a of the reinforcing body portion. For this reason, at least one of the stay portions needs to be shaped like a pipe. The shape of the pipe is not particularly limited; the cross-sectional shape may be cylindrical,
The shape is determined from the point of view of design and function, such as a triangular cylinder shape, a square cylinder shape, etc., and a curved shape such as a dogleg shape in addition to a straight shape. Alternatively, the insert may have a U-shape or the like, and the stay portion and the reinforcing body portion may be formed of the same hollow body.

(c) Setting part of the parison and insert into the mold (Fig. 7) Close the mold 13 consisting of a split mold, and insert the parison 9.
to be sealed. 13a is a recessed portion having a shape corresponding to the outer peripheral shape of the stay portion 11. Further, a heater or the like is installed in the mold 13 to maintain the parison 9 at a predetermined temperature when the mold is closed.

(d) Blowing compressed air through the insert (Figs. 8 and 9) As shown in Fig. 8, a cross-sectional view parallel to the dividing plane of the mold 13, compressed air is injected through the insert using the compressed air blowing device 14. is blown into the heated parison and blow molding is performed to form the skin 15. To explain in more detail the blowing of compressed air through this insert, compressed air is blown into the reinforcement part 12 through the stay part 11, and this compressed air blown into the reinforcement part 12 is The air is blown out of the reinforcement portion 12, that is, into the parison, from the air outlet 12a. Note that this blowing of compressed air may be performed by sealing the end of one stay part and using only the other stay part.

FIG. 9 is a cross-sectional view when another insert is used. In this embodiment, by making the pipe approximately U-shaped, the stay portion 16
and a reinforcing body portion 17 are formed to serve as an insert. The reinforcement portion 17 has a compressed air outlet 17a. The reinforcement part 17 is
It is also good to make the pipe flat. 18 is a sealing tool;
This seals one end of the stay portion 16.

The size and number of holes for the compressed air outlets formed in the reinforcing body part depend on the properties of the foamed synthetic resin raw material for forming the cushion body, which is injected after forming the skin, the material and shape of the skin, etc. will be determined.

(e) After cooling, demold and obtain a product.

After cooling to a predetermined temperature, the mold is demolded to obtain a product.

FIG. 10 is a perspective view showing another embodiment, showing the step of inserting a part of the insert 19 into the parison 9'. Unlike the previous embodiment, the opening 9'a for charging the insert is used as the open end of the parison 9' formed when the parison is extruded from the molding machine 5, and the parison is cut open as described above. It's something that doesn't exist.

(Effects of the Invention) The present invention provides a part of the insert, mainly the reinforcing body part, in which the reinforcing body part and the stay part communicate with each other, and the compressed air blown from one end of the stay part can be blown out from the reinforcing body part. is inserted into the parison, and compressed air is blown into the parison through this insert to blow mold the skin.

The skin obtained therefore has no openings for the blowing of compressed air, which could not be eliminated in the prior art. For this reason, the skin obtained by the conventional molding method was required at the time of injection and foaming of the foamed synthetic resin raw material forming the cushion body in the subsequent manufacture of the headrest. The work of closing the opening used for blowing compressed air as described above becomes unnecessary for the skin formed by implementing the present invention, which contributes to significant streamlining of manufacturing. Furthermore, since an opening used for unnecessary compressed air blowing is not formed, the appearance of the headrest is not impaired, and therefore it is necessary to provide a concave portion or the like to make this opening difficult to see from the outside. There is no need for design, and there is a great deal of freedom in design.
Therefore, the design of the mold becomes easy, and the manufacturing cost of the mold can be reduced. As described above, the molding method of the present invention is very beneficial for the subsequent manufacturing of headrests and the manufactured headrests.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of the headrest.
Figure 2 is a perspective view explaining the conventional molding method;
The figure is a perspective view of the epidermis formed by the conventional technique.
Figures to Figures 10 are diagrams explaining the molding method of the present invention, Figures 4, 5, 7, and 8 are diagrams explaining the molding process, and Figure 6 is the cutting line in Figure 5. 9 is a sectional view taken along line -, FIG. 9 is a sectional view of another embodiment during molding, and FIG. 10 is a perspective view of another embodiment during molding. 9, 9'... Parison, 9a, 9'a... Opening, 11, 16... Stay part, 12, 17...
Reinforcement body portion, 12a, 17a... Compressed air outlet, 13... Molding mold, 14... Compressed air blowing device, 18... Sealing tool, 19... Insert.

Claims (1)

[Claims] 1 (1) A hollow reinforcing body part and a pipe-shaped stay part communicate with each other, and the compressed air outlet through which compressed air blown from the end of the stay part is blown out is reinforced. A part of the insert included in the body part, mainly the reinforcing body part, is inserted into the parison through the opening of the parison. (2) Close the mold consisting of split molds, and set the parison and part of the insert in this mold. (3) Compressed air is blown into the reinforcing body from the end of the stay part, and blown into the parison from the air outlet of the reinforcing body part to expand the parison and blow mold the skin. (4) Demold after cooling. A method for forming the skin of a headrest with a part of the insert inserted inside, which consists of the above steps.