US Patent 7814579 Modular helmet

A helmet is disclosed that includes a hinged chin guard and a hinged visor. The chin guard and the visor can each be independently raised or they can be raised together. That is, they can be rotated up and from in front of the face of a wearer of the helmet. A one-button release mechanism is provided on the chin guard to release detents that secure the chin guard to the cap body. The chin guard can lock into place when raised or lowered. The chin guard is adapted to rotate in a substantially elliptical trajectory about the sides and top of the cap body. The visor can be rotated through a series of ratchet positions and be removed from the helmet without tools and without removing the chin guard.