JPH0141286Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to footwear having a folded portion, and more particularly to footwear having a folded portion manufactured by slush molding.

(b) Conventional technology In recent years, shoes such as cold-weather boots and rain boots have gone from focusing solely on functionality to having functionality, and in particular, in regions with heavy snowfall and severe cold,
That tendency is strong. Therefore, there is a demand for shoes in which the opening of cold protection boots or rain boots can be folded outward, and in order to make it easier to fold the opening, a member separate from the main body of the footwear has been bonded to the opening.

In addition, as shown in FIGS. 7 and 8, in boots etc., the outer surface 11 of the upper exterior material 10 is formed by injection molding.
Footwear has been known in which a folding groove 12 is provided on the sole to form a folding part so that the upper part of the shoe opening can be easily folded back.

(c) Problems to be solved by this invention In general, in integrally molded footwear made of polyvinyl chloride or the like that is molded by slush molding, when the cuff is folded back, the folded part expands into an umbrella shape.
Another problem was that the folded portions were angular, resulting in very poor fashionability.

In addition, when a separate member is glued to the shoe opening to increase the functionality, there is a problem in that the manufacturing cost increases due to the increase in materials and work processes.Also, since separate parts are glued, storage stability is poor and maintenance etc. The problem was that it was time consuming.

In addition, for footwear molded by injection molding, although it is possible to mold a concave groove on the footwear by providing a protrusion on a part of the injection mold, it is difficult to provide a corresponding protrusion on the back side of the footwear. I had the above problem.

As shown in FIGS. 7 and 8, which show conventional examples, simply providing a concave groove on the outer surface of the upper does not allow sufficient elongation of the inner surface when folded back, and the folded part tends to become angular (see Fig. 8). (Figure), and because the inside is forcibly stretched,
There was a problem that cracks easily appeared on the inside.
In addition, there was a problem in that the folded side was not parallel to the cylindrical part of the upper, and the folded part spread out in an umbrella shape, making it easy to return to its original state.

(d) Means for solving the problem This invention is based on footwear that is formed by integral molding such as slush molding and has a folded part. The foregoing has been achieved by proposing footwear having a folded part, which is characterized in that a convex protrusion is provided on the inner surface position of the corresponding upper exterior material to form a folded part, and the folded part can be freely bent toward the folded groove side. solve the problems.

(E) Function The folded part of the footwear is composed of a concave groove on the outer surface of the upper outer material and a corresponding convex protrusion on the inner surface of the outer material, so when folded back, the convex inner surface It stretches well and can be bent firmly.

In addition, since there is a convex ridge on the inner surface, even if an interior material is attached to the slush molded shoe, the ridge can be touched with a finger or the like from inside the footwear, making it easy to find the folded part.

(f) Examples This invention will be explained based on embodiment drawings.

1 is an exterior material for the upper of footwear, which is formed by slush molding from a material such as polyvinyl chloride resin. 2 is the upper lining fabric material, and 3 is the outsole.
A concave groove 5 is provided on the entire outer surface of the upper 1 slightly below the shoe opening 4 and is substantially parallel to the shoe opening end.
The upper portion is configured as a folded portion 6. A convex protrusion 7 is provided on the entire inner surface of the upper exterior material 1 corresponding to the back side of the fold groove 5, and the fold part 8 is formed along with the fold groove 5.
Configure.

The groove 5 is provided on the upper exterior material 1, and the width l of the groove 5 is
corresponds to the thickness d of the upper exterior material 1, which in this example is approximately twice the thickness d. If the width l of the folded groove 5 is increased, the width of the folded part 8 when the folded part 6 is folded back becomes wider. The width l of the groove 5 is the upper exterior material 1
It is 1 to 4 times the thickness d. Although the concave cross-sectional shape of the groove 5 is semicircular in this embodiment, it may be V-shaped, U-shaped, or shaped in other embodiments.

The protrusion 7 is annularly protruded around the entire inner surface of the upper exterior material 1 at a position corresponding to the back surface of the groove 5. In this embodiment, the cross-sectional shape of the protrusion 7 is a semicircular convex shape, but it is a large circular arc with a longer radius than the semicircular shape of the groove 5. Therefore, the thickness between the grooves 5 and the protrusions 7 of the upper exterior material 1 is determined by setting the width between the lowest part of the grooves 5 and the highest part of the protrusions 7 as the thinnest, and the thickness of the other parts of the upper exterior material 1. Formed thinner than the thickness.

In slush molding, a material (plastisol) is injected into a mold (not shown) and the mold is heated from the outside to gel a certain width of the part that touches the mold, and the center of the mold becomes a gel. It is carried out by flushing them out before they become solidified. By providing a convex strip on the inner peripheral surface of this mold, a concave fold groove 5 can be formed, and at the same time a protrusion 7 corresponding to the fold groove 5 can be formed.
can also be formed. At this time, if the cross section of the protrusion of the mold is semicircular, inverted U-shaped, inverted V-shaped, or square-shaped, the fold groove 5 will be a groove with a corresponding shape, but the corresponding part will be on the back side. Since the inside of the mold is washed away during slush molding, no matter what shape the protruding part of the mold has, the cross section of the protruding part 7 on the inner surface of the upper will be in the shape of a semicircular arc or a similar arc. This becomes a protrusion 7 that protrudes from the curve.

The folded part 8 formed in this way, that is, the folded groove 5
The thickness of the upper exterior material 1 between the ridges and the ridges 7, especially the thickness between the bottom of the groove 5 and the highest part of the ridges 7, is formed to be the thinnest. The thickness of the folded portion 8 of the upper exterior material 1 is thin,
In addition, since the protrusions 7 are provided on the inner surface of the exterior material, the inner surface side can be easily stretched and folded back neatly.

(g) Effects of the invention Therefore, according to this invention, the folded part of the footwear can be easily folded back at the folding groove, and when folded back, the convex protrusion on the inner surface corresponding to the concave folding groove is formed. Since there is room to stretch on the surface and it stretches naturally, the inner side of the folded part bends naturally, which has the effect of making it difficult for cracks and other breaks to occur on the inner side of the folded part.

Furthermore, since the folded part can be folded back without angular deviation, the folded part does not spread out into an umbrella shape, and can be folded neatly so that it is almost parallel to the upper exterior material, and the folded part can be prevented from returning. .

Further, even when a lining material is provided, since the inner circumferential surface of the upper exterior material has a protrusion, the folded part can be confirmed by the touch of a finger, and the folding part can be easily folded back.

[Brief explanation of the drawing]

Figures 1 to 6 are drawings of an embodiment of this invention, and Figure 1 is a front view of the footwear with the folded part erected;
Figure 2 is a front view of the footwear with the folded part folded back.
Fig. 3 is a sectional view taken along the line A-A, Fig. 4 is an enlarged longitudinal sectional view of the folded part of the upper exterior material, Fig. 5 is an enlarged longitudinal sectional view of the folded part of another embodiment, and Fig. 6 is an enlarged longitudinal sectional view of the folded part of the upper exterior material. FIG. 7 is an enlarged vertical cross-sectional view of the folded part when the folded part of the exterior material is folded back; FIGS. 7 and 8 are conventional examples; FIG. FIG. 8 is a cross-sectional view of the same case when folded back at the groove. 1... Upper exterior material, 5... Folded groove, 6... Folded part, 7... Projection, 8... Folded part.

Claims (1)

[Scope of Claim for Utility Model Registration] In footwear that is formed by integral molding such as slush molding and has a folded part, a concave groove is provided on the outer surface of the upper exterior material, and the inside of the upper exterior material corresponds to the concave groove. 1. Footwear having a folded part, characterized in that a convex protrusion is provided on a surface position to form a folded part, and the folded part can be freely bent toward the folded groove side. 2. Footwear having a folded part according to claim 1, wherein the thickness of the folded part of the upper exterior material is thinner than the thickness of other parts. The concave cross-sectional shape of the groove is semicircular, and the convex cross-sectional shape of the protrusion is a protrusion whose cross-sectional shape is a semicircular arc longer than the radius of the semicircle of the groove. Footwear having a folded part according to item 1 or item 2.