Protective breathing mask having a speaking diaphragm for close communication and an electroacoustic transducer system for indirect speech transmission from inside the mask

Claim 1

A protective breathing mask comprising a mask body defining a breathing mask and a first tubular valve support having two axially extending tubular channels extending from the exterior of said mask body toward the interior of said mask body, said first tubular valve support defining an auxiliary air channel extending into the interior of said mask and overlying and connecting with both of said two axially extending channels at their inner ends, one of said axially extending channels being an air inlet channel, the other of said axially extending channels comprising a sound outlet channel, a valve positioned within said air inlet channel for controlling the inlet of air into said air inlet channel, speaking diaphragm means for close communication extending over the inner end of said sound outlet channel and said auxiliary air channel, an electroacoustical transducer means for electro-acoustical indirect speech transmission from the interior of said mask acoustically coupled with said speaking diaphragm through said auxiliary air channel and being arranged in said sound output channel, said transducer means having movable means, and an auxiliary diaphragm covering the inner end of said sound outlet channel and mechanically coupled to said movable means.