Lung-governed valve
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United States of America Patent
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-
May 21, 1991
Grant Date -
N/A
app pub date -
Nov 27, 1989
filing date -
Nov 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lung-governed breathing valve used in a breathing mask for excess pressure operation. The valve has a casing with a spring-loaded control diaphragm which divides the casing into an outer chamber connected to the outside environment and a breathing chamber for conveying the gas for breathing. The control diaphragm controls a breathing gas inlet valve via a lever system and a manually released actuating button. The control diaphragm has a resilient raised portion formed integrally thereon with a recess therein. A push-rod integrally molded on the actuating button is positively engageable in the recess of the raised portion to prevent the lung-governed valve from being accidentally released or switched from the stand-by to the operative position.
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