Midsole for reducing load applied on knee

Abstract

The present invention relates to a midsole which reduces a load applied to a knee, and more particularly, to a midsole which reduces a load applied to a knee, in which a first soft portion and a second soft portion are disposed at a front inner side and a rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.

What is claimed is: 
     
         1 . A midsole which reduces a load applied to a knee, the midsole comprising:
 a first soft portion which is formed at a front inner side based on an arch portion of a foot;   a second soft portion which is formed at a rear inner side based on the arch portion of the foot; and   a hard portion which is formed in the remaining region except for the first and second soft portions and in a region of the arch portion of the foot, and has greater hardness than the first and second soft portions.   
     
     
         2 . The midsole of  claim 1 , wherein the first soft portion and the second soft portion have the same hardness. 
     
     
         3 . The midsole of  claim 2 , wherein a hardness ratio of the soft portion to the hard portion is 1:1.1 to 1.6. 
     
     
         4 . The midsole of  claim 1 , wherein the soft portion and the hard portion are joined together while being in direct contact with each other. 
     
     
         5 . The midsole of  claim 1 , wherein the soft portion and the hard portion have inclined cross sections that are vertically joined together, respectively, and a value of hardness in a region where the soft portion and the hard portion are joined together is between a value of hardness of the soft portions and a value of hardness of the hard portion. 
     
     
         6 . The midsole of  claim 1 , wherein an arch shank, which has greater hardness than the hard portion, is installed in a region of the hard portion which corresponds to the arch portion of the foot. 
     
     
         7 . The midsole of  claim 1 , wherein the arch shank is installed in a foot arch region between the first soft portion and the second soft portion. 
     
     
         8 . The midsole of  claim 1 , wherein the midsole is configured to be inserted into an outsole having a bottom portion and a side wall portion.