Abstract: A mask and regulator for a self-contained breathing apparatus (SCBA) having a lens and a nozzle, the regulator being adapted for connection to the nozzle. A bifurcated display is mounted on the regulator for displaying amounts of pressure through a port communicating with the lens on either side of the nozzle. A high pressure connection to the source of breathing gas is connected to a transducer assembly for indicating the pressure to the bifurcated display on the regulator on either side. The display provides pressure values through the exterior of the lens in a bifurcated manner analogous to an arcuate gauge display.

Abstract: A mask and regulator for a self-contained breathing apparatus (SCBA) having a lens and a nozzle, the regulator being adapted for connection to the nozzle. A bifurcated display is mounted on the regulator for displaying amounts of pressure through a port communicating with the lens on either side of the nozzle. A high pressure connection to the source of breathing gas is connected to a transducer assembly for indicating the pressure to the bifurcated display on the regulator on either side. The display provides pressure values through the exterior of the lens in a bifurcated manner analogous to an arcuate gauge display.

Abstract: A positive pressure demand regulator having a housing with a connection for delivering breathing gas with an outlet connected to the housing for attachment to a mask. A diaphragm is mounted in the housing and a passage connects the outlet and the diaphragm so that the diaphragm can be in fluidically connected relationship to the outlet. A main valve interconnects the breathing gas connection to the outlet for valving breathing gas to the outlet. A cam is attached to the diaphragm for lifting the diaphragm into an inoperative mode with a detent connected to the cam operated by a cam rod engaging a cam surface to lift the detent into a position for placing the detent in displaced relationship from where the diaphragm is in an operative mode, mounted in the housing on the side of the diaphragm opposite from the outlet.

Abstract: A face mask for supplying oxygen to personnel such as flight crews during times when there is inadequate air available, has fitted to it a device containing a passageway leading from the interior to the exterior of the mask, and a manually operable, slidable valve stem adapted in a first position to block the exit through the passageway of gas within the mask, and in a second position to open the passageway to permit the flow of gas from the interior to the exterior of the mask. The exit opening from the passageway is located at the upper nose area where it will be encompassed within the cavity of a goggle fitted over the vicinity of the eyes of the user. By manually moving the valve stem to the position where the passageway is open, oxygen from within the face mask is forced into the goggle cavity to flush out from the goggle cavity any smoke or noxious gas which may be present within it.