Reversible fastening device

Abstract

Reversible fastening device of a helmet chin guard for motorcyclist or similar, by snap fit of parts interacting on the two sides of the chin guard and of the helmet, following the insertion, in the operating position, of the chin guard thanks to reciprocally cooperating guides, the device comprising, on each helmet side, a hook belonging to the chin guard and a hook belonging to the helmet, one of which is moveable and subjected to the action of a return spring and it is releasable by a user command, characterized in that at least the hook subjected to the action of the return spring is made of metallic material.

1 . Reversible fastening device of a helmet chin guard for motorcyclist or similar, by snap fit of parts interacting on the two sides of the chin guard and of the helmet, following the insertion, in the operating position, of the chin guard thanks to reciprocally cooperating guides, the device comprising, on each helmet side, a hook belonging to the chin guard and a hook belonging to the helmet, one of which is moveable and subjected to the action of a return spring and it is releasable by a user command, characterized in that at least the hook subjected to the action of the return spring is made of metallic material. 
     
     
         2 . Device according to  claim 1 , characterized in that the hook subjected to the action of the return spring is assembled on the helmet. 
     
     
         3 . Device according to  claim 1 , characterized in that the metallic hook is made of die-cast aluminum. 
     
     
         4 . Device according to  claim 1 , characterized in that the moveable hook exhibits at least one its surface frictionally resting on a surface of, or integral with, the fixed hook. 
     
     
         5 . Device according to  claim 1 , characterized in that in the operating position the two hooks exhibit a reciprocal support plane that is substantially perpendicular to the direction of the chin guard insertion. 
     
     
         6 . Device according to  claim 1 , characterized in that in the operating position the two hooks exhibit a reciprocal support plane that is tilted forwardly, in the chin guard direction, from the base of the hook applied on the chin guard towards its free ending. 
     
     
         7 . Device according to  claim 1 , characterized in that the insertion guides for reciprocally sliding between the chin guard and the shell extend at least to the place of the corresponding hooks. 
     
     
         8 . Device according to  claim 5 , characterized in that the insertion guides are dimensioned for reciprocally sliding with a minimum clearance in the direction perpendicular to the sliding direction, reducing to the minimum the clearance of the hooks coupled in the reciprocal support plane. 
     
     
         9 . Device according to  claim 1 , characterized by providing means for holding the chin guard endings in the assembled condition inside the shell, adapted to prevent any reciprocal clearance in the direction perpendicular to the coupled surfaces.