JPH0415041Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is based on a part of the main sole, which is the main body of the shoe sole, which has different material properties from the main sole and has unevenness on the surface side. This invention relates to an injection molded shoe sole with an embedded sole.

[Conventional technology]

Conventionally, an injection-molded shoe sole, in which a partial sole, which has material properties different from the main sole and has unevenness on the surface side, is embedded in the bottom of the main sole, which is the main body of the shoe sole, has been manufactured by, for example, The one shown in the drawing (FIG. 1) of Publication No. 55-118703 is known.

This sole has a detachment prevention peripheral part (disengagement prevention part) formed around the side surface of the partial sole to prevent the partial sole from detaching from the main sole during walking.

[Problem that the invention attempts to solve]

By the way, in conventional injection molded shoe soles, the detachment prevention part that prevents the partial sole from separating from the main sole is formed only around the sides of the partial sole. In the case of a partial sole buried in such a narrow area, it has not been possible to increase the effect of preventing detachment by forming the detachment-preventing peripheral portion, which is the detachment-preventing portion, wide. This has been a problem when the materials used to form the main sole and the partial sole do not have very good adhesion, such as polyurethane and natural rubber.

The present invention was developed against the background of such conventional technology, and is an injection molding method that can improve the prevention of detachment of the partial sole, regardless of the adhesion of the molding material between the main sole and the partial sole. It provides the sole of the shoe.

[Means for solving problems]

That is, the present invention provides an injection-molded shoe sole in which a partial sole is embedded in the bottom of a main sole, which is the main body of the sole, and has material characteristics different from the main sole and has unevenness on the bottom side. The present invention provides an injection molded shoe sole characterized in that a partial sole that is integrally molded with the main sole is embedded in a recess of the partial sole.

[Effect]

In this invention, when the main sole is injection molded, the partial main sole, which is embedded in the recess of the partial sole, is integrally molded with the main sole, so that the relationship between the main sole and the partial sole is Regardless of the adhesion of the molding material, it is possible to improve the prevention of separation of the partial sole.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. In describing this embodiment, an injection molded shoe sole used for casual shoes will be taken as an example.

The overall structure of the injection molded shoe sole according to the embodiment of the present invention is as follows:
As shown in FIGS. 1 and 2, a partial sole 20 having different material properties from the main sole 10 is attached to the bottom 11 of the main sole 10, which is the main body of the injection molded sole.
This partial sole 20 has an uneven portion 30 formed on its bottom side 21, as shown in FIG.

Here, the main sole 10 is obtained by injection molding a main sole material made of foamed polyurethane resin.

The partial sole 20 is made of heat-resistant and abrasion-resistant natural rubber or synthetic rubber such as polyisoprene rubber or styrene-butadiene rubber (SBR), and serves as an anti-slip part of the injection-molded sole. There is.

In this embodiment, the partial sole 20 is formed on the inner side of the shoe at the heel and treading areas, but it is not limited to this range, and its material is not limited to the above-mentioned natural rubber. First, any material may be used as long as it has different material characteristics from the main sole 10.

Further, the uneven portion 30 formed on the bottom side 21 of the partial sole 20 is an uneven portion for further improving the slip resistance of the partial sole 20, and includes a concave portion 31 and a convex portion 32 exposed on the sole surface. It consists of.

The convex portion 32 is a columnar protrusion having a petal shape and a protrusion height approximately half the thickness of the partial sole 20, and the concave portion 31 is formed around the convex portion 32. The recesses 31 are formed across the entire bottom side 21 of the partial sole 20, but the shapes of these projections 32 and the recesses 3
The formation range of 1 is not limited.

Furthermore, the height of the projection 32 is not necessarily limited to approximately half the thickness of the partial sole 20.

The groove width of this recess 31 is usually 3.0 to 30.0 mm.
Moreover, the groove depth is usually 2.5 to 11.0 mm.

Furthermore, an adhesive is usually applied to the side of the partial sole 20 that is embedded in the main sole 10 in order to improve the adhesion between the two members (the main sole and the partial sole). . Further, a predetermined number of main body material inflow holes 22 are formed at the formation positions of the recesses 31 of the partial sole 20 to allow the main body sole material to flow into the recesses 31 during injection molding of the main body sole 10. There is. Furthermore, the tip of the convex portion 32 is slightly protruded from the bottom surface of the sole 10 in order to improve grip on the road surface and further improve anti-slip properties.

Now, in the injection molded sole of the present invention, the partial sole 2
A partial sole 40, which is a part of the sole 10, is embedded in a recess 31 formed on the bottom side 21 of the shoes.

This partial sole 40 is integrally molded with the main sole 10, so that the main sole 10 and the partial sole 20 sandwich the partial sole 20 from the inner and outer sides of the sole, and the structure is improved. This prevents the partial sole 20 from separating from the main sole 10.

By doing so, it is possible to improve the effect of preventing the separation of the rubber partial sole 20, which does not have very good adhesion between the main sole 10 made of polyurethane resin and this sole.

Note that this partial main body sole 40 is a band-shaped member having a groove shape of the recessed portion 31.

The thickness of this partial sole 40 is usually 2.0~
10.0 mm, preferably 3.0 to 4.0 mm; if it is less than 2.0 mm, the partial sole will easily fall off, and the main sole 1
If 0 is an injection molded material, problems may arise in terms of flow, while if it exceeds 10.0 mm, the sole itself tends to become thicker, which is not preferable.

The partial sole 40 can be formed by, for example, placing the partial sole 20 made of natural rubber in a predetermined position on a bottom mold (not shown) and injection molding the main sole forming material. The original shoe sole material flows into the recess 31 from the main body material inflow hole 22 formed in the main body material inlet 20, thereby forming the shoe.

When walking while wearing shoes employing the injection molded sole of this embodiment, the partial sole 20 is sandwiched between the main sole 10 and the partial sole 40 from the inner and outer sides of the sole in a sandwich state. Even if the adhesive bonding the main sole 10 and the partial sole 20 peels off, the partial sole 20 can be structurally prevented from separating from the main sole 10.

As explained above, in the injection molded sole of the embodiment of the present invention, the bottom part 11 of the main body sole 10
A partial sole 2 is provided which has different material properties from the main sole 10 and has an uneven portion 30 formed on the bottom side 21.
In the shoe sole in which the number 0 is embedded, since the partial main sole 40, which is a part of the main sole 10, is embedded in the recess 31, the adhesion of the molding material between the main sole and the partial sole is improved. Regardless of the badness, it is possible to improve the prevention of separation of the partial sole.

In addition, in the embodiment, the protrusion height of the convex portion 32 is set to approximately half the thickness of the partial sole 20, so that the partial sole 20 does not come off and has good anti-slip properties and comfort (on the foot). The bottom is what you get.

Furthermore, in the embodiment, the main sole 10 is molded with foamed polyurethane resin, and the partial sole 20 is molded with natural rubber or synthetic rubber, so that it is lightweight, has the effects of the present invention, and has excellent slip resistance and durability. This results in an injection molded shoe sole with a

Although the embodiments of the present invention have been described above, the specific configuration is not limited to these embodiments, and any design changes that do not change the gist of the present invention are also included in the present invention.

For example, in the embodiment, the main body sole molding material flows into the recess through the main body material inflow hole formed in the partial sole, but the invention is not limited to this. When molding an injection-molded shoe sole having a sole, a bottom mold is generally formed with an annular wall for storing a partial sole, which is erected for positioning the partial sole. The main body material inflow hole may be formed by cutting out a part of the annular storage wall, or the main body sole material may be poured directly into the recess by removing this partial sole storage annular wall itself.

In addition, in the example, a single-layer sole was used for the main sole, but it may be a multi-layer sole with two or more layers, and the partial soles may also be multi-layer. It may be hot.

Further, in the embodiment, the injection molded shoe sole of the present invention is an injection molded shoe sole used for casual shoes, but the invention is not limited to this, and for example, sports shoes, men's shoes, It can be used for the soles of any type of footwear, including women's shoes, sandals, slippers, and rain boots.

[Effect of idea]

In this way, the present invention embeds the partial sole that is integrally molded with the main sole in the recess of the partial sole, which improves the adhesion of the molding material between the main sole and the partial sole. Regardless of the badness, the effect of improving prevention of separation of the partial sole can be obtained.

[Brief explanation of drawings]

FIG. 1 is a bottom view of an injection molded shoe sole according to an embodiment of the present invention, FIG. 2 is a front view of an injection molded shoe sole according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of FIG. 1. . DESCRIPTION OF SYMBOLS 10... Main sole, 11... Bottom, 20... Partial sole, 21... Bottom side, 30... Uneven part, 31
...Concave portion, 32...Convex portion, 40...Part of the sole of the main body.

Claims (1)

[Scope of utility model registration request] In an injection molded shoe sole in which a partial sole is embedded in the bottom of the main sole, which is the main body of the sole, the partial sole has different material properties from the main sole and has an uneven part on the bottom side, the recess of the partial sole An injection molded shoe sole, characterized in that a part of the main sole, which is integrally molded with the main sole, is embedded therein.