Upper Provided With Sponge Member in Heel Part

Abstract

An upper includes an inner skin placed on a wear's skin side, and an outer skin placed on an opposite side from the inner skin, wherein a sponge member is housed between the inner skin and the outer skin in a heel portion; the sponge member includes a medial side portion covering a medial side of a calcaneal bone, and a lateral side portion covering a lateral side of the calcaneal bone; and in a developed view where the sponge member is unfolded into a planar shape, a height of a lateral first centroid of a portion corresponding to the lateral side portion is set to be higher than a height of a medial first centroid of a portion corresponding to the medial side portion.

1 . A structure of an upper for improving a fitting property of a heel portion  10  of the upper  1  of a shoe, wherein:
 the upper  1  includes an inner skin  11  placed on a wear's skin side, and an outer skin placed on an opposite side from the inner skin  11 , wherein a sponge member  3  is housed between the inner skin  11  and the outer skin in the heel portion  10 ; 
 the sponge member  3  includes a medial side portion  34  covering a medial side of a calcaneal bone Ca, and a lateral side portion  35  covering a lateral side of the calcaneal bone Ca; and 
 in a developed view where the sponge member  3  is unfolded into a planar shape, a level of a lateral first centroid O 10  of a portion corresponding to the lateral side portion  35  is set to be higher than a level of a medial first centroid O 11  of a portion corresponding to the medial side portion  34 . 
 
     
     
         2 . The structure according to  claim 1 , wherein the medial side portion  34  covers at least a portion of a lower edge Ce of the calcaneal bone Ca directly below a talus Ta, and the lateral side portion covers an area of the calcaneal bone Ca directly above a point O, wherein the point O bisects a distance between a lowermost end point Ae of a lateral ankle A 0  and the lower edge Ce of the calcaneal bone Ca. 
     
     
         3 . The structure according to  claim 2 , wherein the sponge member  3  includes a thin portion  3   a  having a small thickness, and a thick portion  3   b  thicker than the thin portion  3   a , and wherein with the sponge member  3  unfolded, a perimeter of the thick portion  3   b  is surrounded by the thin portion  3   a.    
     
     
         4 . The structure according to  claim 3 , wherein in a developed view where the thick portion  3   b  is unfolded into a planar shape, a level of a lateral second centroid O 20  of a portion of the thick portion  3   b  corresponding to the lateral side portion is set to be higher than a level of a medial second centroid O 21  of a portion of the thick portion  3   b  corresponding to the medial side portion  34 . 
     
     
         5 . The structure according to  claim 3 , wherein a lower edge line  3   b L of the thick portion  3   b  extends, while being upwardly slanted, from a medial side of the heel portion  10  to a lateral side of the heel portion  10  via a back side of the heel portion  10 . 
     
     
         6 . The structure according to  claim 2 , wherein a lower edge line  3 L of the sponge member  3  extends, while being upwardly slanted, from a medial side of the heel portion  10  to a lateral side of the heel portion  10  via a back side of the heel portion  10 . 
     
     
         7 . The structure according to  claim 3 , wherein the sponge member  3  comprises:
 a first sponge plate  31  extending along a medial side of a heel coming from a back side of the heel and also extending along a lateral side of the heel coming from the back side of the heel; and 
 a second sponge plate  32  laid on a foot skin side of the first sponge plate  31 , the second sponge plate  32  having a smaller area than the first sponge plate  31 , wherein: 
 the second sponge plate  32  is laid on a portion of the first sponge plate  31  while being bonded, glued or welded to the first sponge plate  31 ; 
 the thin portion  3   a  is formed by a portion of the first sponge plate  31  on which the second sponge plate  32  is unlaid; and 
 the thick portion  3   b  is formed by a portion where the second sponge plate  32  is laid on the first sponge plate  31 . 
 
     
     
         8 . The structure according to  claim 7 , wherein the second sponge plate  32  is formed by a material having a lower resilience than the first sponge plate  31 . 
     
     
         9 . The structure according to  claim 7 , wherein the second sponge plate  32  is formed by a material having a lower hardness than the first sponge plate  31 . 
     
     
         10 . The structure according to  claim 7 , wherein the second sponge plate  32  is formed by a material having a lower resilience and a lower hardness than the first sponge plate  31 . 
     
     
         11 . The structure according to  claim 2 , wherein the sponge member  3  further comprises a back portion  30  covering a calcaneal tuberosity Cp from directly behind along a virtual line CL dividing the sponge member  3  into the medial side portion  34  and the lateral side portion  35 , and the sponge member  3  defines a narrowed portion  36  that is narrowed downwardly along the virtual line CL without covering an area above the calcaneal tuberosity Cp. 
     
     
         12 . A structure for improving a fitting property of a heel portion  10  of an upper  1  of a shoe, wherein:
 the upper  1  includes an inner skin  11  placed on a wear's skin side, and an outer skin on an opposite side from the inner skin  11 , wherein a sponge member  3  is housed between the inner skin  11  and the outer skin in the heel portion  10 ; 
 the sponge member  3  includes a medial side portion  34  covering a medial side of a calcaneal bone Ca, and a lateral side portion  35  covering a lateral side of the calcaneal bone Ca; 
 the medial side portion  34  covers at least a portion of a lower edge Ce of the calcaneal bone Ca directly below a talus Ta, and the lateral side portion  35  covers an area of the calcaneal bone Ca directly above a point O, wherein the point O bisects a distance between a lower end of a lateral ankle A 0  and the lower edge Ce of the calcaneal bone Ca; 
 the sponge member  3  includes a first sponge plate  31  extending along a medial side of a heel coming from a back side of the heel and also extending along a lateral side of the heel coming from the back side of the heel, and a second sponge plate  32  laid on a foot skin side of the first sponge plate  31 , the second sponge plate  32  having a smaller area than the first sponge plate  31 ; and 
 the second sponge plate  32  is partially laid on the first sponge plate  31  while being bonded, glued or welded together to the first sponge plate  31 . 
 
     
     
         13 . The structure according to  claim 12 , wherein the sponge member  3  further comprises a back portion  30  covering a calcaneal tuberosity Cp from directly behind along a virtual line CL dividing the sponge member  3  into the medial side portion  34  and the lateral side portion  35 , and the sponge member  3  defines a narrowed portion  36  that is narrowed downwardly along the virtual line CL without covering an area above the calcaneal tuberosity Cp. 
     
     
         14 . The structure according to  claim 12 , wherein the second sponge plate  32  is formed by a material having a lower resilience and/or a lower hardness than the first sponge plate  31 .