Multiple-effect respirator

Claim 1

A multiple effect respirator comprising: a driving motor having a shaft extending through opposite sides of said motor adapted for receiving fans thereon; a supplying air fan fixed on the motor shaft on one side of said motor; an exhausting air fan fixed on the motor shaft on the opposite side of said motor; two ventilating fans fixed on the motor shaft at opposite sides of the motor, respectively, and adjacent thereto; a housing having first and second opposite end walls and side wall means extending therebetween, said end walls and side wall means defining a chamber therebetween, said fans and said motor mounted within said chamber with said exhausting fan and said supplying fan adjacent the first and second opposite end walls, respectively, said first end wall having exhaust means therein for permitting discharge of air from the exhausting fan and said second end wall having filtering means connected thereto for permitting delivery of filtered air to said supplying fan, said housing further provided with first partition means mounted within the housing chamber between said exhausting fan and the ventilating fan adjacent thereto for defining an exhaust chamber with the side wall means and the first end wall of said housing and second partition means mounted within the housing chamber between said supplying fan and the ventilating fan adjacent thereto for defining a supply chamber with the side wall means and the second end wall of said housing, said first and second partition means further defining a ventilating chamber between the exhaust chamber and supply chamber, said exhaust chamber having an air inlet therein, said supply chamber having an air outlet therein and said ventilating chamber having an air inlet in fluid communication with ambient and an air outlet therein; a helmet adapted to cover the top of user's head having a front portion and a rear portion adapted for positioning adjacent the front and rear portions of a user's head, respectively, said housing mounted on the front portion of said helmet, said helmet provided with a facepiece pivotally mounted across the front portion thereof and adapted to overlie the user's face in spaced relationship thereto, said facepiece having an oronasal mask adapted to cover the user's nose and mouth mounted thereon at the portion of said face piece adapted to overlie the nose and mouth of the user; a power source electrically connected with said motor and mounted on the rear portion of the helmet; an air delivery tube connected to the outlet of said supply chamber and the mask on said facepiece; an air discharge tube connected to the air inlet of said exhaust chamber and the mask on said facepiece; and air delivery means connected to the outlet of the ventilating chamber and the helmet for delivering of air from the ventilating chamber to the interior of the helmet, whereby when said motor is actuated, air is drawn by supplying fan from ambient through said filtering means into said supply chamber, directed out of said supply chamber into the air delivery tube and delivered to the mask, air exhaled by the user is withdrawn from the mask by said exhausting fan through said air discharge tube into said exhaust chamber and discharged from the exhaust chamber through said exhaust means and air is drawn into the ventilating chamber from the ambient by the ventilating fans and directed out of the ventilating chamber into the air delivery means and delivered to the helmet.