Sole structure and shoes using same

Abstract

An outsole includes: a first stud projecting downwards in a stationary manner in a vertical direction from a reference surface and having a first projection surface; and a second stud having a second projection surface. The second stud moves in the vertical direction so that, when an external force acts on the second projection surface, the outsole hollow is compressively transformed and the second projection surface comes close to the reference surface.

1 . A sole structure for a shoe, the sole structure comprising a midsole made of an elastic material, and an outsole overlaid on a lower side of the midsole,
 the outsole including: a reference surface provided on a lower side of the outsole;   a first stud projecting downwards and in a stationary manner in a vertical direction from the reference surface, and having a first projection surface positioned below the reference surface; and   a second stud being provided adjacent to the first stud and projecting downwards from the reference surface, the second stud having a second projection surface positioned below the first projection surface,   the second stud being provided with an outsole hollow positioned on an upper side of the second stud and defined between an outsole recess set back into an upper face of the outsole and a lower portion of the midsole, and   the second stud being configured to be movable in a vertical direction so that, when an external force acts on the second projection surface, the outsole hollow is compressively transformed and the second projection surface comes close to the reference surface.   
     
     
         2 . The sole structure of  claim 1 , wherein
 the second stud is formed so that a thickness of the second stud from the second projection surface to a bottom of the outsole recess is greater than a depth of the outsole recess.   
     
     
         3 . The sole structure of  claim 1 , wherein
 the second stud is formed so that a surface area of the second projection surface is smaller than an opening area of the outsole recess.   
     
     
         4 . The sole structure of  claim 1 , wherein
 the outsole recess curves to be substantially concave over a region from an opening to a bottom of the outsole recess.   
     
     
         5 . The sole structure of  claim 1 , wherein
 the outsole hollow includes an outsole rib extending upwards from the bottom of the outsole recess toward the midsole, the outsole rib being transformable when the external force acts on the second projection surface.   
     
     
         6 . The sole structure of  claim 1 , further comprising
 a plurality of reinforcements arranged on an outer periphery of the second stud, spaced apart from each other in a circumferential direction of the second stud, and formed integrally with the second stud and the reference surface.   
     
     
         7 . A sole structure for a shoe, the sole structure comprising a midsole made of an elastic material, and an outsole overlaid on a lower side of the midsole,
 the outsole including: a reference surface provided on a lower side of the outsole;   a first stud projecting downwards in a stationary manner in a vertical direction from the reference surface, and having a first projection surface positioned below the reference surface; and   a second stud being provided adjacent to the first stud and projecting downwards from the reference surface, the second stud having a second projection surface positioned below the first projection surface,   the midsole being provided with a midsole hollow positioned on a lower side of the midsole and defined, in a position facing an upper side of the second stud, between a midsole recess set back into a lower surface of the midsole and an upper portion of the outsole,   the second stud being configured to be movable in a vertical direction so that, when an external force acts on the second projection surface, the second projection surface comes close to the reference surface.   
     
     
         8 . The sole structure of  claim 7 , wherein
 the second stud is formed so that a surface area of the second projection surface is smaller than an opening area of the midsole recess.   
     
     
         9 . The sole structure of  claim 7 , wherein
 the second stud being provided with an outsole hollow positioned on an upper side of the second stud and defined between an outsole recess set back into an upper face of the outsole and a lower portion of the midsole, and   the second stud being configured to be movable in a vertical direction so that, when an external force acts on the second projection surface, the outsole hollow is compressively transformed and the second projection surface comes close to the reference surface.   
     
     
         10 . The sole structure of  claim 9 , wherein
 the midsole hollow is provided with a midsole rib extending downwards from a bottom of the midsole recess toward the outsole, and   the outsole hollow is provided with an outsole rib extending upwards from a bottom of the outsole recess toward the midsole, and making contact with a lower end of the midsole rib.   
     
     
         11 . The sole structure of  claim 7  wherein
 the midsole hollow is provided with an elastic soft member. 
 
     
     
         12 . A shoe comprising the sole structure of  claim 1 . 
     
     
         13 . A shoe comprising the sole structure of  claim 7 .