JP2001128707A - Sports shoes and insole thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sports shoes and an insole having extremely excellent shock absorbability and repulsiveness. SOLUTION: A notch part is formed in the heel part and/or toe part of the mid-sole of sports shoes and filled with a cushioning material comprising foam formed from a mixture of 60-80 weight % of an ethylene/octene copolymer and 20-40 weight % of an ethylene/vinyl acetate copolymer. An insole is formed from the cushioning material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to sports shoes and insoles for shoes.

[0002]

2. Description of the Related Art In sports shoes such as tennis, badminton, golf, jogging, and basket, various cushioning materials are provided between an outsole and a midsole of a heel in order to absorb a shock applied particularly to a heel during exercise. Is interposed.

[0003] When the impact on the sole of the foot during sports is examined by taking running as an example, when landing, the overall weight is received by the heel, and then the weight load shifts sequentially from the heel to the toe. It will jump from your toes. From this, it can be said that a cushioning material for a sports shoe which has a large impact absorbing force and a large repulsive force which helps the weight shift from the heel to the toe and jump up is almost ideal.

[0004]

However, the conventional cushioning material is biased toward one of emphasis on shock absorption and resilience. For this reason, cushioning materials with extremely excellent shock absorption have little resilience, while cushioning materials with excellent resilience, such as those using air cushions, have considerably low shock absorption. It has become.

[0005] It is, therefore, an object of the present invention to provide a sports shoe and a shoe insole which have both high shock absorption and high resilience.

[0006]

In order to achieve the above object, the present invention forms a notch in a midsole of a sports shoe, and the notch includes an ethylene / octene copolymer and an ethylene / vinyl acetate copolymer. The cushion material made of the mixture is interposed.

Preferably, the mixture contains 60 to 80% by weight of the ethylene / octene copolymer and 20 to 40% by weight of the ethylene / vinyl acetate copolymer.

Further, the insole of the shoe according to the present invention is formed by a cushion material comprising a mixture of an ethylene / octene copolymer and an ethylene / vinyl acetate copolymer.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 and 2 show the appearance and the internal structure of a sports shoe according to a first embodiment of the present invention. 1 and a shoe sole 2 joined below the upper 1.

The sole 2 has a flat shape corresponding to the shape of the sole, and the outsole portion 3 and the midsole portion 4 are laminated and adhered from the bottom surface. Are detachably arranged.

The outsole portion 3 is made of an elastic material such as rubber having a high frictional resistance, and has a bottom surface formed with a design irregularity (not shown) also serving as a non-slip.

The midsole portion 4 is made of an EVA (ethylene-vinyl acetate copolymer) foam and has a toe equivalent portion 4.
The thickness gradually increases from a to the heel-equivalent portion 4b, and the central portion of the arch-equivalent portion 4c is a concave portion. A joining piece 6 is integrally formed on the side periphery of the midsole part so as to be joined and surround the lower edge of the upper part.

The bottom surface of the heel-equivalent portion of the midsole portion is cut out in a plane circular shape, and the center bottom surface portion of the toe-equivalent portion 4a is cut out in an almost elliptical shape in the width direction. The cushioning materials 7a and 7b according to the present invention
Is filled.

The cushioning members 7 (7a, 7b) are obtained by subjecting a mixture of an ethylene-octene copolymer and an ethylene-vinyl acetate copolymer to a foaming treatment by adding a foaming agent. As the ethylene-octene copolymer, those produced by the method disclosed in JP-A-6-306121 are preferable. The mixing ratio of the ethylene / octene copolymer and the ethylene / vinyl acetate copolymer is set to 60 to 80% by weight of the ethylene / octene copolymer and 20 to 40% by weight of the ethylene / vinyl acetate copolymer. If the mixing ratio of the ethylene / octene copolymer is more than the above range, the moldability deteriorates, while if it is less than the above range, the impact absorption and resilience decrease.

Table 1 below shows test results comparing the cushioning material of the present invention with a known cushioning material in terms of impact absorption and resilience.

In the shock absorption test, a load sensor was set on a shock receiving base, and a test piece having a thickness of 10 mm was placed thereon.
The weight was dropped from 5 cm and 10 cm above the cushion, and the value of the load sensor at that time was read. Further, in the resilience test, a steel ball was dropped from above the test piece, and the drop starting position was set to 100%, and how much the steel ball jumped up was indicated by%. The test pieces A, B, and C were respectively Sorbo (trademark), an air cushion material for sports shoes of Company X, which is most popular among young people, and a cushion material (ethylene-octene copolymer of 70% by weight) used in the present invention. %, 30% by weight of the ethylene-vinyl acetate copolymer) in the form of a sheet.

[0017]

[Table 1]

As is apparent from the above test results, the cushioning material (test piece C) employed in the present invention has the same shock absorbing property as that of the conventional test piece A, which is highly evaluated as having excellent shock absorbing properties. Test piece B, while not significantly reduced
, 2.5 to 3 times the shock absorption. Further, the resilience of the cushioning material employed in the present invention showed the same level of resilience as that of the test piece B which was evaluated to have excellent resilience. As described above, the cushioning material employed in the present invention has both excellent impact absorption and resilience, and can exhibit the best performance when applied to sports shoes.

In the preferred embodiment of the present invention, the cushion member 7 (7a, 7b) is interposed in both the heel-equivalent part and the toe-equivalent part, but may be interposed in either one.
Further, although an example has been shown in which the cushion material 7 is interposed in a cutout formed on the lower surface of the midsole, the present invention is not limited to this, and a cutout is formed on the upper surface of the midsole and the cushion material is formed there. It is also good to interpose.

In the above embodiment of the present invention, an example in which the present invention is applied to a sports shoe has been described. However, this cushion material can be applied to a shoe insole as shown in FIG. In this case, the entire insole may be formed from the cushion material, or the cushion material may be disposed at the center of the heel portion and the toe equivalent portion of the insole similarly to the midsole.

[0021]

As described above, according to the present invention, it is possible to provide a sports shoe and an insole which have both excellent impact absorption and resilience.

[Brief description of the drawings]

FIG. 1 is an external view showing a sports shoe according to the present invention.

FIG. 2 is a cross-sectional view of a sports shoe according to the present invention.

FIG. 3 is a plan view showing an arrangement position of a cushion material in a midsole portion of the sports shoe of the present invention.

FIG. 4 is a perspective view showing an insole of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper part 2 Sole 3 Outsole part 4 Midsole part 5 Insole 7a, 7b Cushion material

Claims (3)

[Claims] 1. A notch formed in a midsole of a sports shoe, and a cushion made of a foam of a mixture of an ethylene / octene copolymer and an ethylene / vinyl acetate copolymer is interposed in the notch. Sports shoes characterized by: 2. The sports according to claim 1, wherein the mixture contains 60 to 80% by weight of the ethylene / octene copolymer and 20 to 40% by weight of the ethylene / vinyl acetate copolymer. shoes. 3. A shoe insole formed by a cushion material comprising a foam of a mixture of an ethylene / octene copolymer and an ethylene / vinyl acetate copolymer.