Midsole having hard portion and soft portion

Abstract

A midsole has a hard portion and at least one soft portion. The hard portion of the midsole can support the shoe into a predetermined shape and the soft portion of the midsole will provide a bendable capacity for facilitating walking. The midsole is made by double tube injection molding method. Thus, the material capacity of the portion of the hard portion connecting with the soft portion will change gradually from the hard portion to the soft portion to provide a strong structure of the midsole.

What is claimed is  
     
         1 . A midsole has a shape substantially corresponding to a sole of a shoe, which comprises a hard portion and at least one soft portion; said midsole being molded by double tube injection molding method with a hard molding material and a soft molding material; the hard molding material and the soft molding material are picked from one type of material but having different hardness material capacities; said hard portion of said midsole being molded by said hard molding material to have a harder capacity; said soft portion of said midsole being molded by the soft molding material to have a softer and bendable capacity; the material capacity of the portion of said hard portion connecting with said soft portion is changing gradually from said hard portion to said soft portion.  
     
     
         2 . According to the midsole as defined in  claim 1 , wherein said soft portion locating at the front side of said midsole corresponding to the toes and the joint of foot; said hard portion locating at the rear side of said midsole corresponding to the arch and the heel of foot.  
     
     
         3 . According to the midsole as defined in  claim 1 , wherein comprising tow of said soft portions, one of which locating at the front side of said midsole corresponding to the toes and the joint of foot, the other locating at the rear side of said midsole corresponding to the heel of foot; said hard portion locating at the midsection of said midsole corresponding to the arch of foot.  
     
     
         4 . According to the midsole as defined in  claim 1 , wherein said midsole being mainly made of said hard portion; two of said soft portions providing at the front side and the rear side of said midsole corresponding to the joint and the heel of foot respectively.  
     
     
         5 . According to the midsole as defined in  claim 1 , wherein said hard portion locating at the central portion of said midsole; said soft portion locating around at the outer side of said hard portion.  
     
     
         6 . A midsole has a shape substantially corresponding to a sole of a shoe, which comprises a hard portion and at least one soft portion; said midsole being molded by double tube injection molding method with a hard molding material and a soft molding material; the hard molding material and the soft molding material are picked from two types of materials having different hardness material capacities; said hard portion of said midsole being molded by said hard molding material to have a harder capacity; said soft portion of said midsole being molded by the soft molding material to have a softer and bendable capacity; the material capacity of the portion of said hard portion connecting with said soft portion is changing gradually from said hard portion to said soft portion.  
     
     
         7 . According to the midsole as defined in  claim 6 , wherein said soft portion locating at the front side of said midsole corresponding to the toes and the joint of foot; said hard portion locating at the rear side of said midsole corresponding to the arch and the heel of foot.  
     
     
         8 . According to the midsole as defined in  claim 6 , wherein comprising tow of said soft portions, one of which locating at the front side of said midsole corresponding to the toes and the joint of foot, the other locating at the rear side of said midsole corresponding to the heel of foot; said hard portion locating at the midsection of said midsole corresponding to the arch of foot.  
     
     
         9 . According to the midsole as defined in  claim 6 , wherein said midsole being mainly made of said hard portion; two of said soft portions providing at the front side and the rear side of said midsole corresponding to the joint and the heel of foot respectively.  
     
     
         10 . According to the midsole as defined in  claim 6 , wherein said hard portion locating at the central portion of said midsole; said soft portion locating around at the outer side of said hard portion.