Protection mask

Claim 1

A protection mask comprising a flexible hood having an inside surface and an outside surface, a head opening for placing said hood over the head of a wearer, said hood being made of transparent plastic for allowing the wearer to see through the hood, said transparent plastic having at least one fire retardant additive incorporated therein, an elastic band for gathering the head opening of said hood around the neck of the wearer, said hood having an inhale opening located in the vicinity of the mouth of the wearer, filtering means covering said inhale opening for filtering air entering through said opening wherein said filtering means comprises at least one gauze pad sewn over the outside of said inhale opening of said hood and another gauze pad sewn on the inside of said hood over said inhale opening, said filtering means including charcoal positioned between said gauze pads, and check valve means through said hood which opens to allow air to exit from said hood when the wearer exhales and which closes when the wearer inhales outside air through said inhale opening and through said filtering means, wherein said check valve means is located on one side of said bond spaced from said inhalation opening and comprises an elongate tube extending through said hood, said elongated tube having a base portion defined by an annular flange projecting radially outwardly from said tube and being attached on the inside surface of said hood, said base portion being adapted to prevent said tube from being pulled through said hood, said tube projecting from said base portion, through said hood, outside of said mask and into a readily expandible and collapsible sleeve formed of a flexible plastic film, said sleeve having an end portion which terminates in a free end remote from said tube and which progressively decreases in cross-section in a direction extending toward said free end, said end portion having at least one opening which allows air to exit from said hood through said tube and sleeve when the wearer exhales and which closes to block passage of air through said tube when the wearer inhales, said opening being elongated at least in the general direction of the longitudinal axis of said sleeve.