Breathing apparatus and facepiece therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 25, 2000
Grant Date -
N/A
app pub date -
Sep 17, 1997
filing date -
Sep 18, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A breathing apparatus comprises a supply of breathable gas and a facepiece by which breathable gas is supplied to a wearer, the facepiece including a supply valve for delivering gas to the interior of the facepiece, and an exhaust opening closeable by an exhaust valve for allowing the egress of exhaled gas from the facepiece. The exhaust valve comprises a movable valve member which, in a first position, closes the exhaust opening in the facepiece, in a second position is displaced toward the interior of the facepiece relative to the first position while still in sealing engagement with the exhaust opening to open the supply of breathable gas, and in a third position is displaced outwardly of the facepiece relative to the first position to open the exhaust opening to allow the egress of exhaled gas. The valve member is biased towards the second position by a single significant biasing means. A sealing element is preferably interposed between the valve member and the exhaust opening.
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