Cold weather ventilation system for faceshield defogging

A replacement face shield assembly for snowmobile, motorcycle and bicycle helmets, the face shield assembly having ventilation for cold-weather face shield defogging and comprising:

• a face shield frame;
• a lower face shield frame vent located on a lower portion of said face shield frame;
• an upper face shield frame vent located on an upper portion of said face shield frame;
• a face shield carried by said face shield frame;
• and
• a substantially upwardly-extending deflecting member which is integral to said upper face shield frame for directing air that has entered the upper vent to flow about the exterior of a helmet when said face shield frame is mounted on the helmet, said deflecting member being located immediately above said upper vent.

A sports helmet assembly having a versatile, adjustable ventilation system which can operate in a defog-only mode in cold weather, a defog and interior ventilation mode in warmer weather, and an interior ventilation-only mode when no defogging is desired, the helmet assembly comprising:

• a sports helmet having a front helmet portion, a rear helmet portion, and an exterior;
• at least one helmet air entry vent on said front helmet portion, said helmet vent having a sliding switch to selectively open and close the helmet vent;
• at least one air exit vent on said rear helmet portion;
• a face shield frame having a lower frame portion and an upper frame portion, said frame being pivotally mounted onto said sports helmet;
• a lower face shield frame vent located on said lower frame portion, said lower face shield frame vent having a sliding switch to selectively open and close said lower vent;
• an upper face shield frame vent located on said upper frame portion, said upper face shield having a sliding switch to selectively open and close said upper vent;
• and
• a face shield carried by said face shield frame;
• wherein said upper frame portion has an air flow director which, when said upper and lower face shield frame vents are open, directs air entering said upper face shield frame vent to flow along the exterior of said helmet, thereby creating a vacuum which draws air from said lower face shield frame vent in a substantially upward direction along an interior surface of said face shield.

A replacement face shield assembly for a snowmobile helmet which has a cold weather ventilation system for face shield defogging comprising:

• a substantially convex face shield frame having an interior side, an exterior side and a face shield opening;
• a substantially convex face shield carried by said face shield frame, said face shield extending across the full width and length of said face shield opening;
• a lower face shield frame vent located on a lower portion of said face shield frame immediately below said face shield, said lower vent having a plurality of spaced apertures and a sliding lower vent cover mounted adjacent to said plurality of spaced apertures, said sliding vent cover having a closed position in which said vent cover blocks said spaced apertures and prevents air from entering said spaced apertures, and an open position in which said vent cover allows air to flow from said exterior side of said face shield frame through said plurality of spaced apertures to said interior side of said face shield frame, said sliding lower vent cover being slidable from said open position to said closed position;
• an upper face shield frame vent located on an upper portion of said face shield frame above said face shield, said upper frame vent having a plurality of spaced air intake slots and a sliding slot cover, said sliding slot cover being slidable from a slot open position, in which air may flow through said slots from said exterior side of said face shield frame to said interior side, to a slot closed position in which said slot cover blocks said slots and prevents air from flowing through said slots;
• said face shield frame further comprising a substantially upwardly projecting portion which is integral to said face shield frame and which is located immediately above said plurality of spaced air intake slots on said upper portion of said face shield frame;
• and
• said face shield frame having two end tabs, one at each end of said face shield frame, each end tab having a mounting aperture which is surrounded by a ring of upraised ratchet teeth.