Composite protective helmet

Abstract

A composite protective helmet comprises two or more separable and mutually connectable parts that can be interconnected by L-shaped projections on one of the parts and L-shaped recesses on a mating part so that during assembly the L-shaped projections are inserted into the mating recesses and the separable parts are interconnected by shifting one part relative to the other so that elements of the L-shaped projections that are parallel to the mating end faces are inserted into respective parts of the recesses, and then the separable parts of the helmet are locked in the assembled state, e.g., by hooks on one of the parts and a hook-engaging ferrule on the other of the separable parts. The advantage of the composite protection helmet is that after the parts are separated, they can be stored in a relatively small space, e.g., in a top box attachable to the luggage rack of a motorcycle.

1 . A composite protective helmet having a substantially semispherical impact-resistant shell having a front side and a back side, the helmet comprising:
 at least a two separable and mutually connectable parts which in the connected state form the semispherical impact-resistant shell and have mating end faces which, when in the connected state of the impact-resistant shell form a division line defined by the mating end faces when the mating faces are in contact with each other, the division line passing along the middle of the semispherical shape in the longitudinal direction of the helmet;   a plurality of connecting members for connecting the separable parts formed on the mating end faces of the separable parts, the connecting members comprising L-shaped projections on one of the separable parts and L-shaped recesses on the other of the separable parts, each L-shaped projection comprising a first element that extends outward in the direction perpendicular to the end face of the first mating end face and a second element that extends from the end of the first element in the direction parallel to the end face of said one of the separable parts, while each L-shaped recess on the other of the separable parts comprises a first recess that extends inward into the end face of said other of the separable parts in the direction perpendicular thereto and a second recess that extends from the end of the first recess in the direction parallel to the end face of said other of the separable parts.   
     
     
         2 . The protective helmet of  claim 1 , comprising at least one locking mechanism for locking the separable parts relative to each other in the assembled state of the protective helmet. 
     
     
         3 . The protective helmet of  claim 2 , wherein each separable parts of the shell have a wall with a thickness that increases toward the end faces of the separable parts in order to form a ridge of an increased thickness sufficient for the formation of the connecting members, the ridge being smoothened and having a streamlined shape. 
     
     
         4 . The protective helmet of  claim 1 , wherein the helmet is molded from a plastic, the L-shaped projections are made from metal molded in the plastic, and the L-shaped recesses have walls that are lined with metal. 
     
     
         5 . The protective helmet of  claim 2 , wherein the helmet is molded from a plastic, the L-shaped projections comprise metal inserts molded in the plastic, and the L-shaped recesses have walls that are lined with metal. 
     
     
         6 . The protective helmet of  claim 3 , wherein the helmet is molded from a plastic, the L-shaped projections comprise metal inserts molded in the plastic, and the L-shaped recesses have walls that are lined with metal. 
     
     
         7 . The protective helmet of  claim 2 , wherein the helmet is molded from a plastic, the L-shaped projections are reinforced with a metal wire molded in the plastic, and the L-shaped recesses have walls that are lined with metal. 
     
     
         8 . The protective helmet of  claim 3 , wherein the helmet is molded from a plastic, the L-shaped projections are reinforced with a metal wire molded in the plastic, and the L-shaped recesses have walls that are lined with metal. 
     
     
         9 . The protective helmet of  claim 1 , comprising at least one locking mechanism for locking the separable parts relative to each other in the assembled state of the protective helmet. 
     
     
         10 . The protective helmet of  claim 9 , wherein the locking mechanism comprises a hook on one of the separable parts and a hook-engaging ferrule on the other of the separable parts. 
     
     
         11 . The protective helmet of  claim 2 , comprising at least one locking mechanism for locking the separable parts relative to each other in the assembled state of the protective helmet. 
     
     
         12 . The protective helmet of  claim 11 , wherein the locking mechanism comprises a hook on one of the separable parts and a hook-engaging ferrule on the other of the separable parts. 
     
     
         13 . The protective helmet of  claim 3 , comprising at least one locking mechanism for locking the separable parts relative to each other in the assembled state of the protective helmet. 
     
     
         14 . The protective helmet of  claim 13 , wherein the locking mechanism comprises a hook on one of the separable parts and a hook-engaging ferrule on the other of the separable parts. 
     
     
         15 . The protective helmet of  claim 4 , comprising at least one locking mechanism for locking the separable parts relative to each other in the assembled state of the protective helmet. 
     
     
         16 . The protective helmet of  claim 15 , wherein the locking mechanism comprises a hook on one of the separable parts and a hook-engaging ferrule on the other of the separable parts. 
     
     
         17 . The protective helmet of  claim 7 , comprising at least one locking mechanism for locking the separable parts relative to each other in the assembled state of the protective helmet. 
     
     
         18 . The protective helmet of  claim 17 , wherein the locking mechanism comprises a hook on one of the separable parts and a hook-engaging ferrule on the other of the separable parts. 
     
     
         19 . The protective helmet of  claim 1 , wherein the protective helmet comprises four separable and mutually connectable parts. 
     
     
         20 . The protective helmet of  claim 2 , comprising locking mechanisms for locking the separable parts relative to each other in the assembled state of the protective helmet.