Sports boot shell with comfort sock

Abstract

A sports boot shell of which at least a part of the wall is composed of a sock covered with a rigid material in plastics material, wherein the sock includes, on its inner surface, an insulating means limiting losses of heat by radiation, which may be a polyurethane coating that includes aluminum particles or aluminum pieces bonded on the inner surface. The process for manufacturing such a boot comprises the step of lasting the sock prior to injection-overmolding of plastics material in order to form the wall of the shell.

1 . A sports boot shell of which at least part of the wall is composed of a sock ( 7 ) covered with a rigid layer in a plastics material ( 2 ), wherein the sock ( 7 ) includes, on its inner surface, an insulating means limiting losses of heat by radiation.  
   
   
       2 . The sports boot shell as claimed in  claim 1 , wherein the insulating means consists of pieces of aluminum sheet bonded to the inner surface of the sock ( 7 ).  
   
   
       3 . The sports boot shell as claimed in  claim 1 , wherein the insulating means is a polyurethane coating that includes particles of material possessing properties of reflection of thermal radiation.  
   
   
       4 . The sports boot shell as claimed in  claim 3 , wherein the insulating means is a polyurethane coating that includes aluminum particles.  
   
   
       5 . The sports boot shell as claimed in  claim 3 , wherein the polyurethane coating forms a first inner layer of the sock, which is covered by an intermediate foam layer insulating against conduction of heat, then by a third layer in a compatible material in order to allow overmolding of a plastics material ( 2 ).  
   
   
       6 . The sports boot shell as claimed in  claim 1 , wherein the sock ( 7 ) occupies a wide surface surrounding the foot and is connected ( 6 ) to a part in flexible plastics material ( 1 ) forming at least one flap over the instep.  
   
   
       7 . The sports boot shell as claimed in  claim 6 , wherein the plastics material ( 1 ) is linked ( 5 ) to a very flexible part ( 4 ) in order to form at least one very flexible flap.  
   
   
       8 . The sports boot shell as claimed in  claim 6 , wherein the plastics material ( 2 ) covers the sock ( 7 ) and its link ( 6 ) with the plastics material ( 1 ).  
   
   
       9 . The sports boot shell as claimed in  claim 8 , wherein a third plastics material ( 3 ) covers the border zone ( 8 ) between the two plastics materials ( 1 ,  2 ).  
   
   
       10 . A sports boot that includes a shell as claimed in  claim 1 .  
   
   
       11 . A process for manufacturing a sports boot shell as claimed in  claim 1 , comprising the following steps: 
 production of a sock ( 7 ) from a fabric having a property of thermal insulation against radiation;    lasting of the sock ( 7 ) obtained;    injection-overmolding of a plastics material ( 2 ) over the entire surface occupied by the sock ( 7 ).    
   
   
       12 . The process for manufacturing a boot shell as claimed in  claim 11 , wherein production of the sock ( 7 ) comprises a step consisting in bonding aluminum pieces onto its inner surface.  
   
   
       13 . The process for manufacturing a boot shell as claimed in  claim 11 , which also comprises the following step prior to lasting of the sock ( 7 ): 
 linking ( 6 ) the sock ( 7 ) having a notch with a plastics material ( 1 ) in order to form at least one flap covering the notch;    and wherein injection-overmolding of the second plastics material ( 2 ) covers this link ( 6 ) between the sock ( 7 ) and the first plastics material ( 1 ).    
   
   
       14 . The process for manufacturing a boot shell as claimed in  claim 13 , which also comprises the supplementary step consisting in injection-molding a third plastics material ( 3 ) over the linking zone ( 8 ) between the two first plastics materials ( 1 ,  2 ).  
   
   
       15 . The process for manufacturing a boot shell as claimed in  claim 11 , which also comprises the step of forming at least one flap via a link between the first or the second plastics material ( 1 ;  2 ) and a very flexible part ( 4 ), in leather, plastics or fabric.