Composite insole structure

Abstract

Provided is a composite insole structure including: an insole body being oblong, having a front segment, a middle segment and a rear segment, being made of foam by foaming, and having hardness of 50˜80 OO; and a heel element made of plastic and disposed at the rear segment of the insole body. The middle area of the heel element is of greater thickness than the peripheral area of the heel element; hence, the middle area of the heel element is arched to be centrally raised and thus thinned toward the edge of the middle area radially. The heel element is of hardness of 35˜75 OO.

What is claimed is: 
     
         1 . A composite insole structure, comprising:
 an insole body being oblong and having a front segment corresponding in position to a human foot's ball, a rear segment corresponding in position to the human foot's heel, and a middle segment connecting the front segment and the rear segment, wherein the insole body is made of a foam by foaming and has an upper surface facing upward and a lower surface facing downward, with a superficial layer disposed on the upper surface of the insole body and adapted to come into contact with the human foot's sole, and   a heel element made of a plastic and corresponding in shape to the rear segment of the insole body, wherein a middle area of the heel element is of greater thickness than a peripheral area of the heel element, wherein the middle area of the heel element is arched to be centrally raised and thus thinned toward the edge of the middle area radially, wherein the heel element is disposed at the rear segment of the lower surface of the insole body.   
     
     
         2 . The composite insole structure of  claim 1 , wherein the heel element is made of PU gel, styrene block copolymer or natural rubber. 
     
     
         3 . The composite insole structure of  claim 2 , wherein the heel element is of hardness of 35˜75 OO. 
     
     
         4 . The composite insole structure of  claim 3 , wherein the insole body is made of a foam, such as EVA, PU, latex or gel form (thermoplastic rubber cross-linking foam), by foaming. 
     
     
         5 . The composite insole structure of  claim 4 , wherein the insole body is of hardness of 50˜80 OO. 
     
     
         6 . The composite insole structure of  claim 1 , wherein the heel element is made of PU gel, styrene block copolymer or natural rubber and is of hardness of 35˜75 OO. 
     
     
         7 . The composite insole structure of  claim 6 , wherein the thickness of the thickest portion of the heel element is one to three times greater than the thickness of the rear segment of the insole body, and the superficial layer is made of polyester, nylon, cotton or hemp. 
     
     
         8 . The composite insole structure of  claim 5 , wherein the edge of the heel element has an arcuate lead angle to connect to the edge of the rear segment of the insole body. 
     
     
         9 . The composite insole structure of  claim 8 , wherein a join surface is disposed at the rear segment of the insole body and corresponds in position to the lower surface of the insole body, wherein a height difference is defined between the join surface and the middle segment, wherein a height difference defined between the front edge of the heel element and the lower surface of the insole body and corresponding in position to the middle segment of the insole body can be eliminated. 
     
     
         10 . The composite insole structure of  claim 9 , wherein an edge of the upper surface of the insole body has a flange which extends upward, wherein, starting from the front segment, the flange protrudes from the upper surface of the insole body and extends toward the rear segment, wherein the length of an extension of the flange located at the middle segment and corresponding in position to the arch is greater than the length of an extension of the flange located at the other positions.