JP4368731B2 - Headrest and manufacturing method thereof - Google Patents

Description

  The present invention relates to a headrest attached to a seat or the like of an automobile and a manufacturing method thereof.

  As this type of headrest, for example, as shown in FIG. 5, there is known one in which a pad portion 32 is formed to have a substantially L-shaped side surface by using a side-shaped substantially U-shaped stay 31. When the pad portion 32 of the headrest is molded, for example, as shown in the figure, a molding die 33 including three divided dies 33a, 33b, and 33c is used. The skin 34 is set in the cavity 34 a between the split dies 33 a to 33 c of the molding die 33 in a state where the central portion 31 a of the stay 31 is accommodated in the bag-shaped skin 34. Thereafter, a filling material 35 such as foamed urethane is injected into the outer skin 34 through a funnel-shaped injection port 36 and expanded and expanded, whereby the pad portion 32 having a shape according to the cavity 34a is formed.

In addition, as a method of forming a normal headrest having a side surface of a substantially elliptical shape using a side-shaped substantially linear stay, a method disclosed in, for example, Patent Document 1 has been proposed. ing. That is, in this conventional method, a skin made of a material having air permeability is used, and a stay made of a hollow pipe having a plurality of small holes formed in the center is used. Then, with the center portion of the stay inserted into the bag-shaped skin, the skin is set in the cavity of the mold. In this state, the foam material made of expandable resin beads is filled into the skin, and steam is supplied into the skin through a plurality of small holes through the stay, so that the foam material is melted and foamed to form the mold. A pad portion having a shape according to the cavity is formed.
Japanese Patent Laid-Open No. 7-250981

However, these conventional molding methods have the following problems.
First, in the molding method shown in FIG. 5, the stay 31 is bent into a substantially U shape on the side surface, and the cavity and the skin 34 have a substantially L shape on the side surface, so the skin 34 is set in the cavity. At this time, the central portion 31 a of the stay 31 is arranged close to the skin 34. For this reason, when the filling material 35 filled in the skin 34 is expanded by foaming, the filling material 35 enters the portion where the distance between the central portion 31a of the stay 31 and the skin 34 is narrow. On the other hand, the gas generated at the time of foaming stays in the same part, and as shown by the chain line C in FIG. That is, the filling material 35 is injected into the outer skin 34 from the inlet 36 and falls to the lower part of the outer skin 34, and foam expansion starts from that position, and a part of the excess gas generated by the foaming is Escape from the seam of the sewing part. Then, in the central portion 31a of the stay 31, as shown by an arrow in FIG. 5, the filling material 35 expands around the central portion 31a. For this reason, if the portion between the central portion 31a of the stay 31 and the skin 34 is narrow, the filling material 35 is difficult to reach that portion, and since that portion is not so close to the sewing portion, excess gas is generated. Surrounded, the result is a cavity in this narrow part.

Further, in the molding method of Patent Document 1, a foam material made of expandable resin beads is filled in a breathable skin, and through a stay made of a hollow pipe, a small hole at the center is inserted into the skin. By supplying steam to the foamed material, the foamed material is melted and foamed. For this reason, the supplied steam and the gas generated at the time of foaming are easily discharged to the outside through the skin, so that there are not many cavities formed in the foamed material, but the molten foamed material oozes out through the skin. It is easy and the appearance as a headrest is impaired.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a headrest that can prevent the formation of a cavity in a filling material that is filled and foamed in a state where a stay is set in an epidermis, and can improve the appearance.

To achieve the above object, the present invention relates to a headrest according to claim 1, in the epidermis, which is formed in a bag shape by stitching the sides cloth and peripheral side cloth, Ri name from the pipe material, the side surface shape U In the headrest formed by arranging the center portion of the stay having a shape and foaming and expanding the filling material in the outer skin thereof to form the pad portion having the side shape L shape, for removing the gas generated from the filling material A degassing hole is formed in the peripheral wall of the stay, and the degassing hole is formed corresponding to a portion where a space between the stay and the outer skin is narrowed. It is formed so as to open toward the skin forming the inner side .

The invention according to claim 2 is the invention according to claim 1 , comprising only the skin, the stay and the filling material.

The invention according to claim 3 relating to the method of manufacturing the headrest uses a skin formed into a bag shape by stitching together both side cloths and a peripheral side cloth, and a stay made of a pipe material and having a side U shape. as well as set the epidermis central portion of the stay is accommodated placed into the mold, and injecting a filling material into the epidermis, the filler material is foamed and expanded, the pad portion constituting a side surface shaped L-shaped In the method of manufacturing the headrest , the filling is performed through the vent hole formed in the peripheral wall of the stay so as to open toward the skin forming the inside of the pad portion at the center portion of the stay. The gas generated from the material is extracted.
According to a fourth aspect of the present invention, in the third aspect of the present invention, the filling material is expanded and expanded from a position between the center portion of the stay and the skin forming the outside of the pad portion. Is.

(Function)
Therefore, according to the present invention, when the stay is set on the skin, when the filling material is injected into the skin and foamed and expanded, the gas generated at the time of foaming is supplied from the vent hole to the stay made of the pipe material. It is discharged outside through the inside. For this reason, it is possible to prevent the gas from staying in the filling material and forming a cavity.

  In addition, if a vent hole is provided corresponding to the part where the distance between the stay and the skin is narrow, it is effective for the gas to stay even at a position where the distance between the stay and the skin is narrow. Can be suppressed. Therefore, even if the stay has a substantially U-shaped side surface and the pad portion has a substantially L-shaped side surface, the possibility of forming a cavity in the filling material can be reliably prevented.

  As described above, according to the present invention, it is possible to prevent a possibility that a cavity is formed in the filling material that is filled and foamed in a state where the stay is set in the epidermis, and to obtain a headrest having a good appearance. Can do.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the headrest 11 of this embodiment includes a pad portion 12 having a substantially L-shaped side surface and a side-shaped substantially U-shaped stay 13 having a central portion embedded in the pad portion 12. It is configured. The pad portion 12 is formed by accommodating and arranging the stay 13 in the central portion of the bag-like skin 14 and foaming and expanding a filling material 15 such as urethane foam in the skin 14.

  As shown in FIGS. 1 and 2, the stay 13 is formed of a metal pipe material having a hollow portion 13 a, both ends thereof are opened, and both leg portions project outside the pad portion 12. The outer skin 14 is formed into a bag shape by sewing a plurality of outer skin materials 14a at opposite edges, and a stay 13 is inserted into the outer skin 14 or a filling material 15 is injected into the inner bent portion at the bottom center. For this purpose, an opening 14b is formed.

  As shown in FIGS. 1 to 3, the central portion 13 b of the stay 13 corresponds to the portion where the cavity is likely to be formed in the filling material 15, that is, the position where the distance between the stay 13 and the skin 14 is narrow. A plurality of gas vent holes 16 are formed through the peripheral wall. These vent holes 16 are formed so as to be located at the center in the width direction of the skin 14. The gas generated when the filling material 15 is expanded and expanded in the skin 14 passes through the hollow portions 13a of the stay 13 from the gas vent holes 16 and is discharged to the outside from the openings at both ends. It has become.

Next, a method for forming the headrest 11 configured as described above will be described.
Now, when the pad portion 12 of the headrest 11 is formed, as shown in FIG. 4, a forming die 21 composed of three divided dies 21a, 21b, and 21c that are opposed to each other is used. Then, with the central portion 13 b of the stay 13 accommodated in the bag-shaped skin 14, the skin 14 is set in the cavity between the split dies 21 a to 21 c of the molding die 21. Then, a filling material 15 such as urethane foam is injected into the outer skin 14 from the funnel-shaped inlet 22 through the opening 14 b provided at the bottom of the outer skin 14, and expanded according to the cavity. The pad portion 12 having a different shape is formed. In this case, most of the excess gas generated by the foaming expansion of the filling material 15 is discharged to the outside from the seam or the like of the sewing portion.

  When the pad portion 12 is molded, when the filling material 15 is foamed and expanded in the outer skin 14, the filling material 15 is formed in a portion where the distance between the central portion 13b of the stay 13 and the outer skin 14 is narrow. It is difficult to enter, and gas generated during foaming tends to stay in the same part. In particular, the middle portion in the length direction of the central portion 13b of the stay 13 that is the central portion in the width direction of the skin 14 is separated from the stitched portion 14c between the both side fabrics and the peripheral fabric of the skin 14, so that The gas cannot be expected to be discharged from the stitched portion of the gas, and the gas tends to stay.

  However, since a plurality of gas vent holes 16 are formed at the center of the central portion 13b of the stay 13, the staying gas passes through the hollow portions 13a of the stay 13 from these gas vent holes 16 and opens at both ends. To the outside of the skin 14. Therefore, it is possible to reliably prevent a gas from staying in the filling material 15 and forming a cavity, and to make a headrest having a good appearance and function. Moreover, in order to achieve this, only the gas vent hole 16 is provided in the stay 13, so there is no increase in extra steps or new processing is added to the mold 21. And low cost.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-The gas vent holes 16 are provided in places different from the above embodiment, such as both legs of the stay 13.

  In the embodiment, the gas vent hole 16 is formed in a groove shape extending in the axial direction of the stay 13.

The partially broken perspective view which shows the headrest of one Embodiment. The perspective view which expands and shows the stay of the headrest of FIG. The expanded sectional view in the 3-3 line of FIG. Sectional drawing which shows the shaping | molding apparatus of the headrest of FIG. Sectional drawing which shows the shaping | molding apparatus of the conventional headrest.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Headrest, 12 ... Pad part, 13 ... Stay, 14 ... Skin, 15 ... Filling material, 16 ... Gas vent hole, 21 ... Mold.

Claims (4)

Foaming the epidermis, which is formed into a bag shape by stitching the sides cloth and peripheral side cloth, Ri name from a pipe material, with placing the center portion of the stay forming a side-shaped U-shaped, the filler material within the epidermis In a headrest that is formed by inflating and forming a pad portion having a side shape L shape ,
Forming a vent hole in the peripheral wall of the stay for venting the gas generated from the filling material ;
The vent hole is formed corresponding to a portion where the space between the stay and the skin is narrowed, and opens toward the skin forming the inside of the pad portion at the center of the stay. A headrest that is shaped like so . The headrest according to claim 1, comprising only the skin, the stay, and the filling material. Using a skin formed in a bag shape by stitching the fabric on both sides and the circumferential fabric, and a stay made of pipe material and having a side U shape, the skin with the central portion of the stay accommodated is molded In the method of manufacturing a headrest, which is set in a mold, and a filling material is injected into the skin, the filling material is expanded by foaming, and a pad portion having a side shape L shape is formed.
  A headrest for venting gas generated from a filling material through a vent hole formed in a peripheral wall of the stay so as to open toward the skin forming the inner side of the pad portion at a center portion of the stay. Production method. The method of manufacturing a headrest according to claim 3, wherein the filling material is foamed and expanded from a position between a central portion of the stay and the skin forming the outer side of the pad portion.

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