Patent ID: 6016802
Filing Date: 2000-01-25
Classification: A62B

Abstract:
In a facepiece for a breathing apparatus by which breathable gas is supplied to a wearer and exhaled gas is exhausted therefrom, said facepiece including a supply valve for delivering breathable gas to the interior of said facepiece and an exhaust opening closeable by an exhaust valve for allowing the egress of exhaled gas from said facepiece, the improvement wherein said exhaust valve comprises an inwardly biased valve member movable relative to said exhaust opening and having a first position in which said valve member closes said exhaust opening and is in sealing engagement therewith, a second position in which said valve member is displaced towards the interior of said facepiece relative to said first position with said valve member still in sealing engagement with said exhaust opening, a third position in which said valve member is displaced outwardly of said facepiece relative to said first position and wherein said exhaust opening is open for allowing egress of exhaled gas, a single biasing means for biasing said vale member towards said second position, and operating means engageable by said valve member when said valve member is in said second position for opening said supply valve.