Crew oxygen mask with pneumatic comfort adjustment

Details Crew oxygen mask with pneumatic comfort adjustment Crew oxygen mask with pneumatic comfort adjustment

A - Human Necessities

62

B

137/1.5

A62B 7/00 (2006.01) A62B 9/00 (2006.01) A62B 18/08 (2006.01) G05B 13/02 (2006.01)

Patent

CA 1299058

Abstract of the Invention A respirator especially constructed for flight crews has a harness strap which can be in- flated to a somewhat rigid, self-sustaining orienta- tion to permit one-handed placement of the respira- tor over the wearer's head. Once the respirator is in place, release of a lever for inflating the strap deflates the latter to a orientation sufficient to cause the resilient strap to tightly press a peri- pheral seal of the respirator mask against nose and mouth areas of the user's face. A comfort adjust- ment to relieve strap tension permits selective reinflation of the strap to a somewhat smaller value than necessary for initial donning of the harness, and the limited reinflation pressure is sufficient for causing the mask to seal against the face during pressure demand breathing. In instances where pressurized breathing is needed, however, pressure within the strap is automatically released so that the strap presents sufficient bias to hold the mask against the face without oxygen leakage therepast. (Docket No. 19838)

591962

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