Tennis shoes

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 (L 2 /L 1 ) of the distance (L 2 ) of the ground-contact surfaces ( 11 ) to a distance (L 1 ) 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.

1 . Tennis shoes comprising a large number of ridges arranged on bottom faces thereof, wherein the ridge has a cross section taking an asymmetrical shape and 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.  
   
   
       2 . Tennis shoes comprising a large number of lateral ridges extended in a transverse direction on bottom faces thereof, wherein the lateral ridge has a cross section taking an asymmetrical shape and 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.  
   
   
       3 . The tennis shoes according to  claim 2 , wherein the lateral ridge includes a contact surface, and a toe side wall surface and a heel side wall surface which are linked to the contact surface, and a difference (θb-θa) between an inclination angle θa of the toe side wall surface and an inclination angle θb of the heel side wall surface is 10 degrees to 60 degrees.  
   
   
       4 . The tennis shoes according to  claim 2 , wherein the lateral ridge has a height of 1 mm to 8 mm.  
   
   
       5 . The tennis shoes according to any of claims  2 , further comprising a longitudinal ridge extended in a longitudinal direction, the lateral ridge being 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, and the longitudinal ridge being mainly formed in a region provided on the toe side of the bottom face from the center in the longitudinal direction at an inside from the center in the transverse direction.  
   
   
       6 . Tennis shoes comprising a large number of lateral ridges and a large number of longitudinal ridges on bottom faces thereof, a ratio R 1  of a contact area of the lateral ridges to a total contact area in a toe portion being 40% to 70% and a ratio R 2  of a contact area of the longitudinal ridges to the a total contact area in an inside portion being 70% to 100%.  
   
   
       7 . The tennis shoes according to  claim 6 , wherein the lateral ridge takes an asymmetrical sectional shape in a longitudinal direction of the shoes, the longitudinal ridge takes an asymmetrical sectional shape in a transverse direction of the shoes, a coefficient of friction μa in a toe direction of the bottom face and a contact surface is smaller than a coefficient of friction μb in a heel direction, and a ratio (μa/μb) of μa to μb is 0.3 to 0.9.  
   
   
       8 . The tennis shoes according to  claim 6 , wherein the ratio R 1  is 45% to 65% and the ratio R 2  is 75% to 95%.  
   
   
       9 . The tennis shoes according to  claim 8 , wherein the ratio R 1  is 50% to 60% and the ratio R 2  is 80% to 90%.