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Tennis shoes

a technology for tennis shoes and uppers, applied in the field of tennis shoes, can solve the problems of insufficient consistency between non-slip performance and sliding performan

Inactive Publication Date: 2005-11-24
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] Tennis shoes according to the present invention comprise a large number of ridges arranged on bottom faces. The ridge has a cross section taking an asymmetrical shape. A ratio (μa / μb) of a coefficient of friction μa in one direction of the bottom face to a coefficient of friction μb in a reverse direction is 0.3 to 0.9. The tennis shoes are excellent in a sliding performance in one direction and a nonslip performance in a reverse direction.
[0006] Tennis shoes according to another invention comprise a large number of lateral ridges extended in a transverse direction on bottom faces. The lateral ridge has a cross section taking an asymmetrical shape. A ratio (μa / μb) of a coefficient of friction μa in a toe direction of the bottom face to a coefficient of friction μb in a heel direction is 0.3 to 0.9. The tennis shoes are excellent in a sliding performance in the toe direction and a nonslip performance in the heel direction.
[0008] It is preferable that the tennis shoes should comprise a longitudinal ridge in addition to the lateral ridge. The longitudinal ridge is extended in a longitudinal direction. The lateral ridge is mainly formed in a region provided on a toe side from a center of the bottom face in the longitudinal direction at an outside of a center in a transverse direction. The longitudinal ridge is mainly formed in a region provided on the toe side from the center of the bottom face in the longitudinal direction at an inside from the center in the transverse direction. The tennis shoes are excellent in a sliding performance and a nonslip performance in a forward movement and the nonslip performance in the change of a direction.
[0009] Tennis shoes according to yet another invention comprise a large number of lateral ridges and a large number of longitudinal ridges on bottom faces thereof. A ratio R1 of a contact area of the lateral ridges to a total contact area in a toe portion is 40% to 70%. A ratio R2 of a contact area of the longitudinal ridges to the total contact area in an inside portion is 70% to 100%. The tennis shoes are excellent in the nonslip performance and the sliding performance.

Problems solved by technology

Also in the tennis shoes disclosed in the publication described above, the nonslip performance and the sliding performance are not sufficiently consistent with each other.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0094] A rubber composition containing a styrene-butadiene copolymer as a base material was put in a mold to cause a crosslinking reaction over the rubber. Thus, a sole was obtained. The pattern of the bottom face of the sole is shown in FIG. 2. The sole has a large number of lateral ridges formed thereon. The lateral ridge has an inclination angle θa of 30 degrees, an inclination angle θb of 90 degrees, a height H of 3 mm and (L2 / L1) of 0.25. A midsole constituted by an ethylene-vinylacetate copolymer and an upper constituted by cotton were attached to the sole so that tennis shoes according to an example 1 were obtained.

example 4

[0096] Tennis shoes according to an example 4 were obtained in the same manner as in the example 1 except that the mold was changed and a sole comprising lateral and longitudinal ridges taking shapes shown in the following Table 1 was formed. The pattern of the sole is shown in FIG. 7.

[Test for Practical Use]

[0097] A player was caused to put on tennis shoes and to carry out the rally of tennis at an artificial turf court having sand (a trade name of “OMNICOURT” manufactured by SUMITOMO RUBBER INDUSTRIES, INC.). The easiness of a change in a direction, a nonslip performance in a start, a sliding performance and a tired feeling of legs were evaluated in five stages of “1” to “5”. The highest evaluation was indicated as “5”. An average value of the evaluations for ten players is shown in the following Table 1. As shown in the Table 1, an outsole according to each of the examples has excellent evaluation results for all items.

TABLE 1Result of evaluationCompara.Compara.Example 1Examp...

experiment 2

[Experiment 2]

Example 5

[0098] A rubber composition containing a styrene-butadiene copolymer as a base material was put in a mold and was vulcanized. Thus, a sole was obtained. The pattern of the bottom face of the sole is shown in FIG. 9. The sole has a plurality of lateral ridges and a plurality of longitudinal ridges formed thereon. A ratio R1 of the contact area of the lateral ridge to the total contact area of the ridges in a toe portion is 50% and a ratio R2 of the contact area of the longitudinal ridges to the total contact area of the ridges in an inside portion is 90%. A midsole constituted by an ethylene-vinylacetate copolymer and an upper constituted by cotton were attached to the sole so that tennis shoes according to an example 5 were obtained.

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PUM

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Abstract

Tennis shoes, comprising soles (5) having bases (7) and a large number of horizontal reinforcement crests (9), the horizontal reinforcement crests (9) further comprising ground-contact surfaces (11), toe side wall surfaces (13), and heel side wall surfaces (15), wherein the cross sectional shape of the horizontal reinforcement crests (9) is asymmetric, the tilted angle (θb) of the heel side wall surfaces (15) is larger than the tilted angle (θa) of the toe side wall surfaces (13), a difference therebetween (θb-θa) is 10 to 60°, the height (H) of the horizontal reinforcement crests (9) is 1 to 8 mm, the ratio (L2 / L1) of the distance (L2) of the ground-contact surfaces (11) to a distance (L1) of a boundary part between the bases (7) and the horizontal reinforcement crests (9) is 0.2 to 0.8, and the ratio (μa / μb) of the coefficient of friction (μa) of a bottom surface in toe direction to the coefficient of friction (μb) in heel direction is 0.3 to 0.9.

Description

TECHNICAL FIELD [0001] The present invention relates to tennis shoes. More particularly, the present invention relates to an improvement in the bottom faces of the tennis shoes. BACKGROUND ART [0002] In the rally of tennis, a player makes a stroke while heavily moving in a court. The player predicts the direction of a ball from the stroke of an opponent and moves toward a target spot. Feet kick a ground to carry out the movement. When approaching the target spot, the player stops the kicks and recovers the balance of the stroke. Then, the feet of the player take a slide on the ground. The body of the player is moved forward by the slide at a short distance. Most of the movement to the target spot is carried out by kicking and the movement in a final stage is performed by the slide. The player reaching the target spot makes a stroke. Next, the player inverts the body to kick the ground, thereby moving to a next target spot. [0003] It is preferable that the tennis shoes and the ground...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A43B5/10A43B13/14A43B13/22
CPCA43B5/10A43B13/223A43B13/141A43B13/26
Inventor KOBAYASHI, KAZUHIKO
Owner SUMITOMO RUBBER IND LTD
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