JP3244864B2 - Shoe sole and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole used for athletic shoes having spikes and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, sports shoes with spikes that can be replaced with spikes have a connecting nut as a spike attachment member or a driving nut on a sole body made of a material such as EVA sponge, rubber or polyurethane, or natural leather. A nut was placed on the back of the shoe sole or buried inside the shoe sole, and a spike mounting screw was inserted through the insertion hole to screw the spike. On the other hand, in the case of athletic shoes with spikes, which cannot be replaced with spikes, a method of embedding a base for fixing spikes in the sole body of the shoe by an injection method has been common.

[0003]

Conventionally, EVA sponge, rubber, polyurethane, and the like, which are highly flexible, have been used as the material of the sole of shoes with spikes. Soles made of these materials have high flexibility and are relatively light in weight compared to soles made of other materials, and are therefore frequently used in athletic shoes such as soccer shoes and golf shoes. However, when these highly flexible materials are used for a shoe sole having spikes, stress concentrates on a connecting portion of a connecting nut used by connecting a plurality of nuts or a nut member for attaching the spike when the sole is bent, and There have been inconveniences such as cracking and distortion of the member, breakage of the connecting portion, and the like.

[0004] Further, when the sole of the shoe is bent, an opening is formed in a gap between the spike insertion hole and the spike, and a crack is generated in the sole of the shoe sole from the opening, and water or earth and sand enters from the opening to fix the spike. The spike mounting pedestal has a problem of causing corrosion or degrading the appearance. The shoe sole reinforcing body according to the present invention prevents stress concentration on the nut mounting member and the connection nut when the shoe sole is bent, and also prevents opening that occurs in the gap between the spike and the spike insertion hole. With the goal.

On the other hand, conventionally, when attaching an accessory such as a heel reinforcement or a lunar shape to a shoe sole, the sole body and the above-mentioned reinforcement are separately formed, and a primer and an adhesive are attached to each. A method of applying an agent and pressing the same has been generally practiced. However, the process is complicated and poor adhesion often occurs due to factors such as selection of an adhesive and timing of pressure bonding.

[0006]

The sole according to the present invention is an EV sole.
A sponge, rubber sponge, a synthetic resin such as solid rubber or urethane foam, which is excellent in flexibility and bendability, and lightweight material is preferable. A spike insertion hole is formed at a predetermined position of the shoe sole, and a reinforcing member formed of a material relatively harder than the material of the shoe sole is fixed around the opening of the spike insertion hole. I have. As the material of the reinforcing member, for example, a plastic material having higher hardness and elastic modulus than the shoe sole material such as 6-nylon or 6.6-nylon is used. The shape of the reinforcing member is substantially annular, and its outer diameter is formed larger than the nut mounting member and the flange of the spike. When a replaceable spike is used, a substantially mortar-shaped recess may be provided on the upper surface of the reinforcing body so that the flange of the spike is engaged, and the lower surface thereof forms an inclined surface facing the center. Thus, when the sole of the shoe is bent, the stress concentrated on the nut mounting member and the like is dispersed.

In the method of manufacturing a shoe sole according to the present invention, the shoe sole body is cut from a sheet such as an EVA sponge having a desired thickness, and a spike insertion hole is formed at a spike installation position. The reinforcing member is formed by injection molding with a rigid synthetic resin such as 6-nylon separately from the sole body. The sole body is placed in a thermoforming mold, and the reinforcing body subjected to the primer bonding treatment is placed so as to be aligned with the spike insertion hole of the sole body, then the mold is closed and integrated by thermoforming. I do.

[0008]

In the sole of the present invention having a spike, the sole of the sole is made of a lightweight and highly flexible material such as rubber sponge or urethane foam, and bends freely according to the bending of the user's foot. Around the opening of the spike insertion hole, a reinforcement body made of a material that is more rigid than the sole body is provided around, so when the sole body is bent, the sole body expands It has the effect of preventing the opening that occurs. Further, the diameter of the reinforcing member is formed to be larger than the diameter of the spike flange or the spike mounting base, and the upper surface thereof is provided with a substantially mortar-shaped recess so that the spike flange is engaged with the spike flange. The gap between the openings can be completely prevented. On the other hand, the lower surface forms an inclined surface facing the center direction, and has a shape for dispersing stress concentrated on the nut mounting member and the like when the shoe sole is bent.

Further, in the sole manufacturing method of the present invention, since the sole body and the reinforcing member are integrated by thermoforming, they can be firmly adhered to each other, and the occurrence of poor adhesion is reduced. In addition, since the crimping step can be omitted, the molding step can be simplified.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shoe sole according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment using a driving nut on a shoe sole according to the present invention. The shoe sole body 4 is cut from a sheet of rubber urethane or the like, or is primarily formed by injection molding to form a spike insertion hole. The sole body is placed in a thermoforming mold, the reinforcing body 1 subjected to the primer bonding treatment is placed in the opening of the spike insertion hole, the mold is closed, and integrated by thermoforming. After the shoe sole body is formed by thermoforming, a driving nut 2 is attached from the adhesive surface side of the shoe sole body, and a spike is screwed from the ground surface side. In addition, the diameter of the reinforcing body 1 is formed larger than the diameter of the flange 7 of the spike stud 3. FIG. 2 shows an embodiment using a spike mounting base 6 to which the spikes 3 are fixed. The spike 3 and the body of the spike mounting base 6 are inserted into the spike insertion holes from the adhesive surface, and the spike fixing cap 5 is fitted from the ground surface side. The reinforcing body 1 is provided around the opening of the spike insertion hole, and the outer diameter thereof is formed larger than the outer diameter of the spike mounting cap 5.
FIG. 3 shows a configuration in which the spike mounting base 6 is embedded in the shoe sole body 4, the reinforcing body 1 is provided around the spike 3 on the grounding surface side, and bonded by thermoforming. FIG. 4 is a plan view and a diametrical cross-sectional view of the reinforcing member 1 used in the embodiment shown in FIG. As shown in FIG. 4, a substantially mortar-shaped concave portion 11 is provided on the upper surface of the reinforcing body 1 so that the flange 7 of the spike 3 is engaged, and the opening between the flange 7 of the spike 3 is completely opened. Can be prevented. On the other hand, the lower surface forms an inclined surface facing the center direction, and has a shape for dispersing stress concentrated on the nut mounting member and the like when the shoe sole is bent.

[0011]

Since the sole of the present invention has the above structure, when the conventional sole with a spike is bent as shown in FIG. 5, a mouth formed in a gap between the spike insertion hole and the spike. This has the effect of preventing opening and cracking and distortion of the stress concentration portion in the spike mounting base. That is, in the shoe sole of the present invention, a reinforcing member formed of a material having a higher rigidity than the flexible sole body is provided around the opening of the spike insertion hole, so that the comfort is improved. When the sole body is bent while maintaining the opening, the opening of the opening caused by the extension of the sole body is prevented, and thus the spike mounting base is prevented from corroding due to the influence of water or the like entering from the opening. Further, there is an effect of dispersing stress concentrated on the spike mounting base when the sole of the shoe is bent, thereby preventing damage to the spike mounting base. Further, by changing the color of the reinforcing member, an effect of giving a change to the design of the shoe sole can be expected.

In addition, by forming them integrally by thermoforming, there is an effect that adhesion failure is reduced and the process can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment using a driving nut on a shoe sole according to the present invention.

FIG. 2 is a sectional view of an embodiment using a spike fixing cap on a shoe sole according to the present invention.

FIG. 3 is a sectional view of an embodiment in which a spike mounting base is buried in a shoe sole according to the present invention.

FIG. 4 is a plan view of a shoe sole reinforcement according to the present invention, and FIG.
FIG. 3 is a sectional view taken along line A.

FIG. 5 is a cross-sectional view showing a state where a shoe sole with a spike conventionally used is bent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement body 2 Driving nut 3 Spike 4a Shoe sole body 4b Midsole 5 Spike mounting cap 6 Spike mounting base 7 Flange 8 Inclined surface 9 Spike insertion hole 10 Opening 11 Concave A Adhesive surface side B Ground surface side

Claims (2)

(57) [Claims] In a shoe sole of a shoe having a spike, a synthetic resin having higher rigidity than a shoe sole body is provided around a spike insertion hole formed in a shoe sole made of synthetic resin or natural leather. A ring-shaped member comprising a frusto-conical shape having a ground surface side as a lower bottom surface, and a reinforcing body formed with an outer diameter larger than an outer diameter of a spike flange or a spike mounting base. Sole to do. 2. A reinforcing member made of a synthetic resin having a higher rigidity than a shoe sole body is placed around a spike insertion hole of a shoe sole member made of a synthetic resin or natural leather. The method for producing a shoe sole according to claim 1, wherein the sole is formed by molding.