Innerboot for a sports boot

Abstract

A removable innerboot of a sports boot, the wall of which innerboot comprises a rear part ( 3 ) which is stiffer than a front part ( 4 ), wherein the wall of the innerboot comprises at least one layer comprising in its stiffer rear part ( 3 ) a first element located alongside a more flexible second element of its front part ( 4 ), these two elements being fastened together by an edge-to-edge seam ( 5 ).

1 . A removable innerboot of a sports boot, the wall of which innerboot comprises a rear part ( 3 ) which is stiffer than a front part ( 4 ), wherein the wall of the innerboot comprises at least one layer comprising in its stiffer rear part ( 3 ) a first element located alongside a more flexible second element of its front part ( 4 ), these two elements being fastened together by an edge-to-edge seam ( 5 ). 
     
     
         2 . The sports boot innerboot as claimed in  claim 1 , wherein the layer of the innerboot wall comprising the two elements fastened together by an edge-to-edge seam ( 5 ) is the outer layer of the innerboot wall. 
     
     
         3 . The sports boot innerboot as claimed in  claim 1 , wherein the two elements fastened together by an edge-to-edge seam are two plastics having different stiffnesses. 
     
     
         4 . The sports boot innerboot as claimed in  claim 1 , wherein the stiffer first element of the rear part has a large thickness of between 2.5 and 4 millimeters. 
     
     
         5 . The sports boot innerboot as claimed in  claim 4 , wherein the more flexible second element of the front part has a thickness of less than 2 millimeters. 
     
     
         6 . The sports boot innerboot as claimed in  claim 1 , wherein the edge-to-edge seam ( 5 ) between the two elements is substantially vertical or has curves. 
     
     
         7 . The sports boot innerboot as claimed in  claim 1 , wherein the innerboot wall further comprises a layer of machined foam superposed on at least one area of at least one of the two elements of the innerboot wall which are located alongside one another and fastened together by an edge-to-edge seam ( 5 ). 
     
     
         8 . A method of manufacturing an upper of a removable innerboot of a sports boot, which comprises a step in which a flat blank ( 11 ) is formed comprising the fastening by an edge-to-edge seam ( 15 ) of at least two different elements ( 13 ,  14 ) of different stiffness, the stiffer element ( 13 ) being intended to be positioned in the rear part of the upper. 
     
     
         9 . The method of manufacturing an upper ( 1 ) of a removable innerboot of a sports boot as claimed in  claim 8 , which comprises the formation of a flat blank intended to form an outer layer of the upper, this flat blank comprising a central element ( 13 ) intended to form the rear part of the innerboot upper and two more flexible side elements ( 14 ) intended to form the front part of the innerboot upper, these two side elements ( 14 ) being fastened to the central element ( 13 ) by an edge-to-edge seam ( 15 ). 
     
     
         10 . The method of manufacturing an upper of a removable innerboot of a sports boot as claimed in  claim 8 , which further comprises a step consisting in fastening a foam element on the flat blank ( 11 ) and in machining this foam element after it has been fastened in order to give it a varied shape ( 16 ,  17 ) suited to the anatomy of a foot. 
     
     
         11 . The method of manufacturing an upper of a removable innerboot of a sports boot as claimed in  claim 8 , which comprises a step of shaping the flat blank ( 11 ) in order to form the three-dimensional upper ( 1 ). 
     
     
         12 . A method of manufacturing a sports boot innerboot, which comprises manufacturing an upper ( 1 ) as claimed in  claim 11  followed by a step of fastening a sole ( 2 ) to the upper.