Protective helmet

Abstract

A protective helmet comprising a shell, a crown comprising a ring-shaped body, and a cage for the head of a user, configured to be internally attached to the shell, wherein the crown is interposed between the shell and the cage when the cage is attached to the shell.

1 . A protective helmet comprising:
 a shell;   a crown comprising a ring-shaped body; and   a cage for a user's head, configured to be internally attached to said shell,   wherein said crown is interposed between said shell and said cage when said cage is attached to said shell,   wherein the shell comprises a shell body comprising, on its internal surface, at least two attachment slots for attaching the cage to the shell.   
     
     
         2 . The protective helmet according to  claim 1 , further comprising attachment elements for attaching the cage to the shell by means of engagement with said at least two attachment slots. 
     
     
         3 . The protective helmet according to  claim 1 , wherein said crown comprises, on both an internal surface and an external surface of the ring-shaped body, a number of cavities and grooves. 
     
     
         4 . The protective helmet according to  claim 1 , wherein said crown comprises, on its upper edge, four protuberances, said protuberances being located, when the helmet is worn by a user, in the frontal region, the occipital region and the temporal regions of the user's head. 
     
     
         5 . The protective helmet according to  claim 1 , wherein said crown is made of sintered expanded polystyrene. 
     
     
         6 . The protective helmet according to  claim 1 , wherein the cage comprises a plurality of openings and at least two arms, each of said arms comprising an end portion with a hole and a vertical tooth configured to engage with a respective slot of said attachment slots when the cage is attached to the shell. 
     
     
         7 . The protective helmet according to  claim 2 , wherein each of said attachment elements comprises a ring portion, comprising a hole, and two elastic prongs which extend from said ring portion and each of which ends in a respective retaining tooth. 
     
     
         8 . The protective helmet according to  claim 1 , comprising internally, in an upper portion of the shell body, an internal protection element. 
     
     
         9 . The protective helmet according to  claim 8 , comprising an empty space between a top of the cage and said internal protection element, said empty space having a vertical dimension greater than 25 mm.