JPH0420280Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a headrest insert for a vehicle, and particularly to a headrest insert having a hollow pipe stay.

(Description of Prior Art) Conventionally, a headrest has been attached to the upper part of the seat back of an automobile in order to protect the head of an occupant. Its structure generally consists of a stay 10, an insert body 20, a cushion layer 30, and a skin 40, as shown in cross section in FIG. Note that the stay 10 fixed to the insert main body 20 is called a head rest insert.

The method of manufacturing this headrest that is often used is to manufacture the skin 40 by plastic blow molding, cut the skin open, insert the insert main body 20 with the stay 10 fixed therein, and then After placing it in a predetermined mold, the epidermis 40
In this method, a liquid polyurethane raw material is injected and foamed between the insert body 20 and the cushion layer 30.

By the way, in recent years, there has been an increasing trend toward weight reduction in automobile parts, and headrests have also changed from conventional solid rod-shaped stays (generally made of metal) to hollow pipe stays (also made of metal), and from metal insert bodies to plastic ones. They are being replaced by insert bodies.

Note that the hollow pipe stay is fixed to the insert body by welding if the insert body is made of metal, or by fitting one end of the pipe stay to the side of the insert body if the insert body is made of plastic. However, this is normally accomplished by inserting a rotation stopper pin from the side surface of the insert body to the side surface of the pipe stay at the fitting portion and penetrating the side surface of the insert body and the side surface of the pipe stay.

In addition, in the manufacturing method of the headrest, there is a need for further labor saving, and in order to omit the work of incising the epidermis and sealing the incision during injection foaming, an insert with one end of the stay fixed is used during blow molding of the epidermis. It has become common practice to insert the main body into the parison and encapsulate a portion of the insert main body and the stay within the skin at the same time as the skin is formed.
In this case, the liquid urethane raw material is injected using air pressure holes during blow molding.

(Problems to be Solved by the Invention) However, if an insert in which one end of the pipe stay is fixed to the plastic insert body is used in the labor-saving manufacturing method of the head rest, the following problems tend to occur. .

One is that during blow molding of the skin, pressurized air to inflate the parison flows into the pipe stay from one end of the pipe stay and the insertion part of the anti-rotation pin, passes through the pipe stay, and then the pipe stay is closed. Since the particles escape from the other end to the outside of the parison, the molding of the skin tends to be incomplete. Another reason is that when the liquid urethane raw material is injected and foamed, the urethane raw material itself and the foaming gas generated from the urethane raw material flow out of the parison from the other end of the pipe stay through the inside of the pipe stay, as described above. , the desired foaming pressure and cushion layer cannot be obtained.

In order to prevent this, for example, a structure has been proposed in which the end of the pipe stay 11 on the side where the insert body is fixed is covered with the insert body 21 as shown in FIG. The pressurized air, liquid urethane raw material, and foaming gas leaked from the insertion hole of the rotation stopper pin 41 of the pipe stay, and the sealing was insufficient.

The present invention aims to provide a headrest insert that can overcome the above-mentioned drawbacks.

(Means for Solving the Problems) The gist of the present invention is to fit one end of a hollow pipe stay to the side of the insert body, and to insert a rotation stopper pin from the side of the insert body at the fitting part. In a headrest insert in which the pipe stay and the insert body are fixed by inserting the pin into the side of the pipe stay and penetrating the side of the insert body and the side of the pipe stay, the anti-rotation pin can be inserted into the pipe stay. This is done by filling the pipe stay with a sealant and creating a non-ventilated structure inside the pipe stay.

(Function) At the fitting part of the pipe stay to the insert body, a sealant is filled in the position where the rotation stopper pin is inserted in the pipe stay, and the inside of the pipe stay is made into a non-ventilated structure, so that the pipe stay fits into the insert body. Even if the insert is inserted into the parison when forming the skin of the headrest, the pressurized air to inflate the parison will enter the pipe stay from one end of the pipe stay located inside the parison and the insertion part of the anti-rotation pin. There is almost no risk of leaking out of the parison through the inside of the stay, and even when liquid urethane raw material is injected and foamed, the urethane raw material and foaming gas hardly leak out of the skin through the inside of the pipe stay, preventing pressure loss in foaming pressure. can.

(Example) An example of the present invention will be described below based on the drawings.
Note that parts common to the conventional example are indicated by the same reference numerals.
Figure 1 1, B is a front view of the main part of the insert, and A
-A sectional view.

The insert main body 21 is made of a molded product having a desired shape such as a substantially rectangular shape having an uneven surface, for example, a plastic molded product such as polypropylene resin, and has a stay fitting portion 22 on the side thereof. In the case of the one shown in the figure, there is a tubular stay insertion passage 2 in the lower part.
3. A stay fitting hole 24 is provided in the upper part, and a groove 25 connects the stay fitting hole 24. Note that the shape of this fitting portion 22 can be arbitrarily designed. 26 is an opening provided across the tubular stay insertion path.

The pipe stay 11 is provided with a hole 12 for inserting a rotation stopper pin at a predetermined position thereof, that is, a position corresponding to the opening 26 of the insert main body 21, so as to penetrate from the side surface of the pipe stay. A sealant 50 is filled in the pipe stay centering around the hole 12 portion. As the sealant 50, a hot melt adhesive such as a polyamide-based hot melt adhesive, a polyester-based hot melt adhesive, etc. is suitable. Note that in order to fill the pipe stay 11 with the sealant 50, one of the holes 12 is sealed with a holder or the like, and molten hot melt adhesive or the like is press-fitted into the pipe stay 11 from the other hole 12. It is best to fill it up. Then sealant 5
0 solidifies so as to close the hole 12, and the hole 1
The inside of the pipe stay 11 has a non-ventilated structure centering around the two parts. The pipe stay 11 is inserted and fitted into the insert body 21 so that the hole 12 faces the opening 26 of the insert body 21, and the anti-rotation pin 51 is inserted through the opening 26, the hole 12 and the sealant 50. has been done. That is, even if the pipe stay 11 is bent as shown in FIG. 3, the direction remains constant.

Note that a through hole is formed in a part of the sealant 50 by fitting the anti-rotation pin 51, but the through hole is formed in a part of the sealant 50 so as to be orthogonal to the pipe stay 11. Since the inside of the pipe stay 11 is still sealed with the sealant at the periphery of the through hole, the non-ventilated structure inside the pipe will not be broken.

Further, the sealing agent 50 has the function of elastically holding the rotation stopper pin 51 in the fitted position of the pipe stay 11 to more reliably prevent it from falling off from the pipe stay 11.

(Effects of the invention) As described above, the present invention fits one end of the pipe stay to the side of the insert body, and at the same time inserts a rotation prevention pin from the side of the insert body to the side of the pipe stay at the fitting part. In a headrest insert formed by fixing the pipe stay and the insert body by penetrating the side surface of the insert body and the side surface of the pipe stay, a sealant is filled in the position where the rotation stopper pin is inserted in the pipe stay. By creating a non-ventilated structure inside the pipe stay, we were able to obtain the following effects.

That is, as illustrated in FIG. 2, even if the insert body and the vicinity of the fitting part of one end of the pipe stay are inserted into the parison during molding of the head rest skin and blow molded, one end of the pipe stay and the rotation stopper in the parison are Pressurized air enters the pipe stay from the insertion part of the pin, passes through the pipe stay, and hardly leaks out of the parison from the other end of the pipe stay, making it possible to form a good head rest skin. Furthermore, even if the liquid urethane raw material is injected and foamed into the head rest skin that accommodates the insert body and the vicinity of the fitting part of one end of the pipe stay, the urethane raw material and the foaming gas generated will pass through the pipe stay and the pipe stay in the same manner as described above. There is almost no leakage from the other end of the headrest skin to the outside of the headrest skin, and a drop in the foaming pressure within the headrest skin can be prevented, so a good headrest with no underfill or wrinkles can be formed.

In FIG. 2, numeral 42 represents a blow mold, and 43 represents a nozzle for blowing compressed air (indicated by a broken line).

[Brief explanation of the drawing]

Figures 1A and 1B are front views of one embodiment of the present invention, and A
-A sectional view, Figure 2 is a sectional view of the main part when inserting an insert according to an embodiment of the present invention into a parison to form a headrest skin, Figure 3 is a central longitudinal sectional view of the headrest, and Figure 4 The figure is a sectional view of a main part showing an example of fixation between a conventional pipe stay and an insert body. 11... Pipe stay, 12... Hole, 21...
Insert body, 22... Fitting portion, 23... Stay insertion path, 26... Opening, 50... Sealing agent, 5
1... Rotation stop pin.

Claims (1)

[Scope of utility model registration request] One end of the hollow pipe stay is fitted to the side of the insert body, and a rotation stopper pin is fitted into the side of the pipe stay from the side of the insert body at the fitting part, and the side of the insert body and the pipe stay are inserted. In a head restraint insert in which the pipe stay and the insert body are fixed by penetrating the side surface, a sealing agent is filled in the position where the anti-rotation pin is inserted in the pipe stay to create a non-ventilated structure inside the pipe stay. Head rest insert featuring.