Sole structure and baseball spike shoes with the sole structure

Abstract

A lower surface of an outsole is provided with a high traction stud and a low traction stud arranged around the high traction stud in a lateral side area located on a lateral side of a forefoot including a second proximal phalanx and a second metatarsal and third to fifth phalanges and metatarsals. Each of the high and low traction studs is configured to be longer in a direction along a stress direction, which is a direction of shear stress generated in the lateral side area in a follow through of a hitting movement, than in a direction orthogonal to the stress direction.

What is claimed is: 
     
         1 . A sole structure of baseball spike shoes worn by a wearer in a baseball hitting movement, the sole structure comprising:
 an outsole which supports a plantar of the wearer extending from a forefoot to a hindfoot, wherein   a lower surface of the outsole is provided with a plurality of studs which protrude downward and are arranged dispersedly in a lateral side area located on a lateral side of the forefoot including a second proximal phalanx and a second metatarsal and third to fifth phalanges and metatarsals,   the plurality of studs includes
 a high traction stud providing high traction, and 
 at least one low traction stud arranged around the high traction stud and providing lower traction than the high traction stud, and 
   each of the high and low traction studs is configured to be longer in a direction along a stress direction, which is a direction of shear stress generated in the lateral side area in a follow through of the hitting movement, than in a direction orthogonal to the stress direction.   
     
     
         2 . The sole structure of  claim 1 , wherein
 the at least one low traction stud includes a first low traction stud disposed on at least one of a front side or a back side of the high traction stud and spaced apart from the high traction stud.   
     
     
         3 . The sole structure of  claim 2 , wherein
 the first low traction stud is disposed on each of the front side and the back side of the high traction stud.   
     
     
         4 . The sole structure of  claim 2 , wherein
 the first low traction stud is made of thermoplastic polyurethane.   
     
     
         5 . The sole structure of  claim 1 , wherein
 the at least one low traction stud includes a second low traction stud disposed on a medial side of the high traction stud and spaced apart from the high traction stud.   
     
     
         6 . Baseball spike shoes comprising the sole structure of  claim 1 . 
     
     
         7 . Baseball spike shoes comprising the sole structure of  claim 2 . 
     
     
         8 . Baseball spike shoes comprising the sole structure of  claim 3 . 
     
     
         9 . Baseball spike shoes comprising the sole structure of  claim 4 . 
     
     
         10 . Baseball spike shoes comprising the sole structure of  claim 5 .