Molded Insole, Footwear Item, And Manufacturing Method

Abstract

A molded insole includes a base, an internal lateral arch that is provided to accommodate the arch of the foot and that is raised relative to the base, and at least one hard region that is integrated into the base, having a hardness equal to or greater than that of the base. The base and the internal lateral arch of the insole constitute a single, mono-material part.

1 . A molded insole, comprising a base, an internal lateral arch that is provided to accommodate the arch of the foot and that is raised relative to the base, and at least one hard region that is integrated into the base, having a hardness equal to or greater than that of the base, characterized in that the base and the internal lateral arch of the insole constitute a single, mono-material part 
     
     
         2 . The insole according to  claim 1 , characterized in that the internal lateral arch has a volume adapted to the volume of the arch of the patient's foot, in particular in the case of dysmorphism. 
     
     
         3 . The insole according to  claim 1 , characterized in that the internal lateral arch has a volume and a position determined according to three parameters:
 patient gender;   patient shoe size; and   patient foot morphology.   
     
     
         4 . The insole according to  claim 3 , characterized in that the patient foot morphology parameter has three possibilities: flat, hollow, or physiological foot. 
     
     
         5 . The insole according to  claim 4 , characterized in that a maximum thickness of the insole is 5.6±0.2 mm for a flat foot, 8.4±0.4 mm for a hollow foot, and 8.8±0.2 mm for physiological foot. 
     
     
         6 . The insole according to  claim 1 , characterized in that the internal lateral arch has a curved lower surface forming a hollow with respect to a lower plane of the base and a curved upper surface projecting from an upper plane of the base. 
     
     
         7 . The insole according to  claim 6 , characterized in that the internal lateral arch has lower and upper surfaces, the lower surface having a greater slope than the upper surface. 
     
     
         8 . The insole according to  claim 6 , having an upper surface that is smooth. 
     
     
         9 . The insole according to  claim 1 , characterized in that the hard regions are integrated into hollow chambers formed in the thickness of the base, said hard regions opening onto an underside of said base. 
     
     
         10 . The insole according to  claim 1 , comprising an upper layer covering the mono-material part. 
     
     
         11 . The insole according to  claim 10 , characterized in that:
 the insole, in the parts of the base without hard regions, measured on the upper side and over its entire thickness, has a hardness between 30 and 56 on the Shore A scale depending on the thickness, and   the insole, in the parts of the base incorporating hard regions, measured on the upper side and over its entire thickness, has a hardness between 65 and 77 on the Shore A scale depending on the thickness.   
     
     
         12 . A footwear item, comprising an insole according to  claim 1 . 
     
     
         13 . A manufacturing method of an insole according to  claim 1 , comprising the following steps:
 a) a step of forming at least one hard region having a hardness equal to or greater than that of the base;   b) a step of cutting from a mono-material strip, with or without an upper layer laminated on its surface, a preform to the dimensions of the mold corresponding to the insole;   c) a step of molding the preform in one part comprising the base and the internal lateral arch, formed projecting from the base, at the insole desired size;   d) a step of assembling the part, including the base and the internal lateral arch once removed from the mold, and the hard regions; and   e) a finishing step to obtain the insole.   
     
     
         14 . A method according to  claim 13 , characterized in that step c) of molding the preform is carried out by compressing in a mold a mono-material part of constant thickness, hardness and density, the mold having shapes intended to configure the base so that its upper surface does not undergo deformations when in contact with hard regions. 
     
     
         15 . The method according to  claim 13 , characterized in that step b) comprises, as a preliminary step, laminating a strip corresponding to the upper layer over the entire surface of the mono-material strip.