Breathing apparatus

Details Breathing apparatus Breathing apparatus

A - Human Necessities

62

B

137/1.52

A62B 7/00 (2006.01) A62B 9/00 (2006.01) A62B 19/00 (2006.01)

Patent

CA 1247495

ABSTRACT "Improvements in and relating to breathing apparatus" 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 purifier (which works by exothermic chemical reaction) would otherwise cause.

503440

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