JP2000232902A - Shoe sole and shoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be light and to hardly cause fatigue even in the traveling of long time by forming a reinforcing plate from synthetic resin harder than a mid sole, forming a projection shape in a toe part heel direction and providing a structure for which it is inserted and integrated through the projection shape to the almost entire area of a foot arch part on the ground surface side of the mid sole. SOLUTION: For this shoe sole 1, the reinforcing plate 3 and a main sole 4 are respectively formed by different processes, and after applying an adhesive material to an adhesion surface, they are press-fixed to the mid sole 2 and integrated. An arch cushion 11 is disposed on the lower side of the foot arch part position of a dotted line 10 and foamed urethane is directly mounted on the mid sole 2 for the arch cushion 11. Then, one or two projected lines 31 of the reinforcing plate 3 are provided, the reinforcing plate 3 is covered further and made more effective for twist. Also, at the time of formation by a die, the main sole 4 of a treading part and the main sole 4 of a heel part are arranged at the positions in close contact with the reinforcing plate 3. This shoe prepared by using the shoe sole 1 obtained in such a manner is light in weight and is hardly bent or twisted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a footrest structure of shoes such as walking shoes and jogging shoes.

[0002]

2. Description of the Related Art In recent years, many shoe soles, such as jogging shoes, which emphasize functionality have been scattered. Among them, for general walking, walking,
In a shoe sole used for jogging, the arch is supported by an elastic material, which is an arch cushion adapted to the shape of the arch of the foot, so that the arch can be run for a long time to some extent.

Further, by attaching a shank material to the foot portion of the shoe, the strength is integrally increased from the step portion to the heel portion, and the service life of the shoe sole can be increased. However, during actual jogging, a load of about 2 to 10 times the weight is momentarily applied to the sole, so that the sole is twisted or bent. As a result, the load on the arch of the foot cannot be reduced unless the strength of the shank is increased. This is because the arch of the sole is separated from the arch cushion by the twisting or bending of the sole, so that the effect of the arch cushion cannot be obtained. Therefore, when jogging or walking, fatigue may occur during long-time running.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a foot arch part of a foot by suppressing torsion and bending in the vicinity of the foot part while maintaining the shock absorbing property of the foot part of the sole during running. It is an object of the present invention to provide a shoe sole and shoes which support the arch of the shoe and are light and hard to cause fatigue even in long-time running.

[0005]

The invention according to claim 1 is a shoe sole of a shoe having a midsole made of a foamed synthetic resin and a reinforcing plate, wherein the reinforcing plate is made of a synthetic resin harder than the midsole. At least one ridge is formed in the direction of the heel portion of the toe, and the midsole has a structure in which it is inserted and integrated into almost the entire region of the tread portion on the ground contact surface side via the ridge. An outsole is attached to the shoe sole of the present invention, and the outsole is integrally formed without separating the outsole and the midsole, or is separately attached by bonding or the like. According to the invention of claim 2, in addition to the structure of the above-mentioned shoe sole, the outsole made of an abrasion-resistant elastic plate is brought into close contact with the reinforcing plate on the tread portion and the contact surface side of the heel portion. It was glued in a state and made into a shoe sole. According to this sole,
Since the outsole of the tread portion, the reinforcing plate, and the outsole of the heel portion can be integrally connected, the sole becomes a sole for making shoes that are harder to bend or twist. Furthermore, a third aspect of the present invention is a shoe having the structure of the sole of the first aspect of the present invention.

As means for preventing the sole of the shoe from being twisted or bent, it is sufficient to use a shank made of a rigid metal material over the entire foot portion of the sole. If it is mounted on the ground side, there is a risk that it will slip and fall when stepping on a stone or the like. On the other hand, if this shank material is mounted on the midsole, the shock absorption to the sole is poor. Also, if the shank material is formed of a metal material, it becomes heavy. In the sole of the present invention, in the hardness measurement (JIS K6301) of a spring-type hardness tester A type, it is preferable that midsole <outsole <reinforcing plate.
The reason for this is that the hardness of the outsole may be about the same as that of the midsole, but if a wear-resistant material is selected, it tends to be harder than the midsole. In addition, since the outsole is grounded to the ground, it must be soft to some extent in consideration of shock absorption and slip resistance. This is because the reinforcing plate is required to be harder than the midsole in order to obtain the shank effect, and may be softer than the metal material.

Therefore, in the present invention, the role of the shank material is played by a reinforcing plate having a ridge made of a synthetic resin. At this time, foaming of a homopolymer of ethylene, a copolymer resin of ethylene and another copolymerizable monomer (eg, vinyl acetate, (meth) acrylate, etc.), a polyurethane resin, rubber, etc. If the product is used, shoes that are lightweight and have excellent shock absorption can be made. Reinforcing materials include vinyl chloride resin, polyamide, ABS
Use a highly rigid material such as resin. Further, as the outsole, EVA, poly urethane resin, rubber, thermoplastic elastomer or the like, or a foamed product thereof can be used.

In the present invention, a rigid material refers to a hard material, and a rigid material requires a force to bend. That is, a hard material is difficult to bend. For example, if a 3 mm thick reinforcing member consisting of a flat plate alone is adhered to the 15 mm thick tread portion of the midsole, a shank effect (an effect of suppressing torsion and bending of the sole) can be obtained without using a material that is not easily bent. Those that are not effective and hard to bend so as to produce an effect need to be very hard, and cause the same problems as metal materials. However, the same 3mm thickness and 5mm height
If a reinforcing plate having a degree of protrusion is inserted into the midsole, a shank effect can be obtained if the reinforcing plate is harder than the midsole.

[0009] In this case, it seems that the presence of the ridge impedes the absorption of shock. However, in practice, this does not occur if the height of the ridge is not more than 3/5 of the thickness of the midsole. FIG. 2 shows an example of a reinforcing plate used in the present invention. When this reinforcing plate is used, the thickness of a region forming a substantially flat surface of the reinforcing plate is 1.0 to 4.0 mm, and the thickness of the ridge is 1.0 to 4.0 mm.
The height of the ridge is preferably 1/5 to 3/5 of the thickness of the midsole. Further, FIG. 2 shows an example in which the cross section of the ridge of the reinforcing plate is rectangular, but may have any shape such as a semicircle or a triangle. The direction of the ridge may be slightly oblique as long as it is directed from the toe to the heel. Further, the ridge need not be straight, but may be curved or wavy.

[0010] As a method of inserting and integrating the midsole and the reinforcing plate having the ridge, a groove or a notch for inserting the ridge of the reinforcing plate is formed in the midsole, and these are reinforced. It can be inserted so that the ridge of the plate is sandwiched, but using a soft foamed EVA having a density of about 0.15 to 0.35 kg / m ³ , the foamed EVA is heated in advance to make it softer. In the method of hot compression molding into a midsole of hardness, density and shape, the foamed EVA and a reinforcing plate having a ridge formed in a separate step are arranged in a mold for molding a shoe sole, If EVA is compressed to an average density of 0.45 to 0.90 and then the mold is cooled and taken out, there is no need to form a groove or cut for inserting a ridge of the reinforcing plate on the midsole. . In addition,
At this time, an adhesive is interposed between the foamed EVA and the reinforcing plate.

Further, a reinforcing plate having a ridge is inserted into a mold, and a shoe cap is hung from a last mold to form a cavity in the shape of a midsole. EVA, polyurethane resin, etc. There is also a method of making a shoe by injection-molding the shoe sole and the shell integrally. At this time, if the midsole and the outsole are integrally formed, the manufacturing cost can be reduced.

Since the reinforcing plate provided at the position of the step portion can be firmly integrated with the midsole, the torsion and bending of the sole from the step portion to the heel portion are appropriately suppressed.
Furthermore, if an arch cushion adapted to the arch of the sole is attached to the sole of the midsole, the arch of the foot can be supported at all times from landing to kicking out, so that the heel of the foot and The force applied to the stepping portion can be reduced. Here, the arch cushion provided on the arch part of the foot has an action of supporting the arch of the foot and reducing fatigue of the foot, and a polyurethane resin,
It is formed into a foot arch shape by an elastic body made of a foamed or non-foamed body such as rubber, polyvinyl chloride resin, thermoplastic elastomer, or the like. The arch cushion may be formed on the midsole itself or on the insole.

[0013] In the case of shoes, the arch support of the stepping portion greatly changes depending on the material, shape and the like of the cover, the heel and the stepping portion.
By using the footstep and sole of the shoe of the present invention,
If the configuration of the heel portion, the stepping portion, and the like is appropriately selected and an arch cushion is provided, a shoe with good support of the arch of the foot can be obtained.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) is an explanatory side view of an embodiment of the shoe sole 1 of the present invention. In the shoe sole of the embodiment, the reinforcing plate 3 and the outsole 4 are formed in different processes, and an adhesive is applied to an adhesive surface.
It is crimped on the midsole 2 and integrated. The dotted line indicated by reference numeral 10 represents a contact surface between the shoe sole and the sole, and an arch cushion 11 is provided below the position of the stepped portion of the dotted line of reference numeral 10. In the example, the arch cushion 11 has the polyurethane foam placed directly on the midsole. FIG. 1 (b) is a sectional view taken along the line AA of FIG. 1 (a), and is an embodiment of the shoe sole of the present invention. FIG. 2 is a perspective view of the reinforcing plate 3 used for the step portion of the shoe sole of FIG. 1 (b). FIG. 2 (c) shows another embodiment of the shoe sole of the present invention. This is because the reinforcing plate has two projections, and one side of the reinforcing plate covers the midsole to make it more effective against twisting.

Further, the embodiment will be described in detail. A foamed EVA heated on a midsole, a molded body made of a vinyl chloride resin on a reinforcing plate, and a molded body made of an NBR on an outsole are provided with a vinyl adhesive on a bonding surface. After applying the system adhesive, the foamed EVA was placed in a mold, and the foamed EVA was heated and compressed. Then, the mold was cooled, and the molded shoe sole was removed from the mold. In molding with a mold, the outsole of the tread portion and the outsole of the heel portion were arranged at positions in close contact with the reinforcing plate. Shoes made using the soles obtained in this manner can be made lightweight and hard to bend or twist, and furthermore, by providing an arch cushion, shoes that are less likely to be fatigued even when running for a long time. And could be.

Also, the sole of the shoe sole is to be lightened in order to reduce the weight and to avoid falling because the heel part and the stepping part are separated from the ground when the stone is stepped on the step part. The contact surface side of the portion is formed in a convex shape away from the ground. Therefore, when a large load is applied to the sole, the sole may bend. As shown in FIG. 3 (b), the step portion of the sole formed in a convex shape due to the bending of the sole becomes almost flat, and as a result, a space 9 between the arch cushion and the sole is formed, and The arch cannot be supported. If the shank has a high shank effect like the sole of the present invention, the arch can be always supported as shown in FIG. 3 (a).

[0117]

According to the present invention, the structure of the step portion and the sole of the shoe of the present invention are light, do not impair the shock absorption, and are not easily deformed by bending stress applied to the heel portion from the step portion. Therefore, in particular, shoes made by using an arch cushion in the arch portion can support the arch of the arch of the foot at all times, so that fatigue can be less likely to occur even when running for a long time.

[Brief description of the drawings]

1A is an explanatory side view showing an embodiment of a shoe sole according to the present invention, and FIG. 1B is a sectional view taken along line AA of the shoe sole shown in FIG. Example, (c) is another embodiment of the sole of the present invention.

FIG. 2 is a perspective view of a reinforcing plate 3 used for a step portion of a shoe sole shown in FIG. 1 (b).

FIG. 3 (a) is an explanatory view of a use state of the shoe of the present invention,
(B) is an explanatory view when a shoe that does not use a reinforcing material in a step portion is bent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sole 2 Midsole 3 Reinforcement plate 31 Ridge 4 Outsole 8 Foot 9 Space 10 Line showing contact surface of sole and sole 11 Arch cushion

Claims (3)

[Claims] 1. A shoe sole having a midsole made of a foamed synthetic resin and a reinforcing plate, wherein the reinforcing plate is made of a synthetic resin harder than the midsole and has at least one ridge in the direction of the toe heel. A shoe sole characterized by having a structure formed by being inserted into and integrated with substantially the entire region of the step portion on the ground contact surface side of the midsole via the protrusion. 2. A shoe sole having a midsole made of a foamed synthetic resin and a reinforcing plate, wherein the reinforcing plate is made of a synthetic resin harder than the midsole and has at least one ridge in the direction of the toe heel. Is formed, and is inserted and integrated into almost the entire area of the tread portion on the contact surface side of the midsole via the protrusion, and the tread portion of the midsole and the contact surface side of the heel portion have abrasion resistance. A shoe sole having an outsole provided in close contact with a reinforcing plate. 3. A shoe having a shoe sole comprising a midsole made of a foamed synthetic resin and a reinforcing plate, wherein the reinforcing plate comprises:
It is made of synthetic resin harder than the midsole, and at least one ridge is formed in the direction of the heel of the toe. Shoes.