DUSTPROOF HELMET Russian patent published in 1997 - IPC

FIELD: dust-tight equipment. SUBSTANCE: dustproof helmet has fastener for user's head, transparent viewing shield, sealing members for hermetically sealing of cavity between user's head, helmet and viewing shield, suction-type fan for supplying purified air to user's breathing zone, coarse air filter positioned at inlet end of fan, whose outlet end is communicated with cavity of fine air filter positioned between inner surface of helmet and fastener. Fan casing is fixed on outer surface of back part of helmet, which is provided with opening communicating fan outlet with fine air filter cavity. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 1 dwg