The present invention provides different size breathing masks in which single size filtration shells are attached to a single size face contacting member at the same periphery. A single size face contacting member has one, or more than one size, inner breathing opening with a narrower cut profile in the nose area than in the mouth and chin area. Such different size breathing masks would fit and provide an effective seal for more than one size of wearer.

A breathing bag for inclusion in an open-circuit respirating system in which anaesthetic gases are supplied from an inlet duct (10) to a mask connected at (11). The bag (13) is connected at one end to a flexible exhalation duct (12), and has an open tail (14) as an escape passageway at the other end. An internal rod (21) connects the bag (13) pivotally to a ball and socket joint (22, 23) mounted on a rigid sleeve (25) adapted for connection to a scavenging system. A flexible bellows (27) adjusta...

Breathing equipment including a breathing hood to surround a wearer's head. An inner mask covers at least the wearer's mouth and nose. The equipment includes a breathing gas delivery conduit and structure to permit gas to pass from the hood to the mask. A check valve allows gas to pass from the mask to the surroundings when overpressure in the mask has reached a given value. The breathing gas is delivered to the hood and the gas passing structure permits gas to pass in both directions between th...

A self-rescue breathing apparatus has a radial-flow purifier 3 connected between a mouthpiece and a breathing bag 10. An outer plenum of the purifier is open at both ends, a central conduit is open only at the breathing-bag end. Flap valves 50A and 50B control the flow of gas so that exhaled breath passes radially inwards through the purifying medium which gas for inhalation passes freely up the outer plenum, reducing both the resistance to flow and the heating of the inhaled gas that the purifi...

A forced air breathing apparatus which includes a face piece (20a) for covering at least the nose or mouth of a wearer, a pump unit (10) arranged to supply air to a space within the face piece (20a), a filter (13) to filter air entering the face piece (20a) and valve means to control the flow of air from the pump unit (20) to the face piece (20a) during inhalation and from the face piece (20a) during exhalation. The pump unit (20) includes a fan (12) driven by an electric motor (11). The valve m...

Breathing apparatus supplies air or oxygen to a patient and comprises a hand-held housing (10), a gas inlet on the housing, a gas outlet (12) on the housing (10), and a manual/automatic switch (16) on the housing for supplying gas either to a manually operable valve (40) or to a main valve (48) which delivers gas to the outlet on a cyclic basis. A trigger (22) on the housing (10) controls the supply of gas to the outlet through the manually operable valve (40).

The combination noise suppression and breathing respirator of the present invention includes a face mask of the snorkel or diving type, the facemask sealing against the face of the user around the nose, cheeks, eyes and forehead of the wearer. The facemask has a nosepiece having an exhalation flap check valve for exhalation by the user. Each side of the face mask has a one-way inlet valve at a connection which connects with rearward extending dual use air channel and straps. A noise suppression ...

An improved breathing airway comprising at least two telescopingly engaged flexible elements enabling the airway to be adjusted to the proper length to fit the mouth and pharynx of a patient. To positively secure the adjusted length of the airway, a flap with protruberances extends from the outer element and is engageable with holes in the inner element. Thus, the outer and inner engaged elements can be positively secured at the correct measured mouth to pharynx length. The untelescoped radius o...

A single stage demand valve for passing air from a cylinder of compressed air to a face mask includes a main valve member and a by-pass valve. The by-pass valve is provided to deliver air to the face mask should the main valve member stick or seize in the closed position. The by-pass valve is a constant pressure reduction valve, having a valve member in the form of a piston, whereby variations in air pressure in the breathable gas from the cylinder are compensated ensuring that the desired flow ...

A breathing apparatus comprises a cylinder assembly supported by a harness through a mounting bracket. The bracket has a leg with an open-ended slot into which a grooved portion of the cylinder assembly is passed. The assembly is secured by screwing a pressure-reducing valve onto the shut-off valve of the cylinder assembly, in so doing a knurled ring on the pressure-reducing valve coming into position adjacent to an edge of the bracket to prevent subsequent withdrawal of the cylinder assembly fr...