ABSTRACT OF THE DISCLOSUREAn improved respirator speech unit for the light-type orother model of respirator. The unit has a speech transmitter discpositioned within a frame. To the speech transmitter disc is secured arigid valve seat disc. This valve seat disc is secured parallel to andcoaxial with the transmitter disc so that, in position, it will beexternally positioned in the frame. The valve seat disc is transverselyseatable in the frame with its periphery cooperating with seal means inthe frame to prevent passage of air between its periphery and theframe. The valve seat disc has a circular aperture for passage ofexhaled air from the mask and defines, with the speech transmitter discin position in the frame, an air passage from within the mask to thisaperture. A flexible circular outlet valve is secured at its center tothe other end of the frame, the valve being aligned with the apertureand resting thereon so that, when in position, this valve permitspassage of air from the mask through the aperture, but seals theaperture to prevent entry of outside air into the mask. A respiratorspeech unit according to this construction is more reliable and moreserviceable than the previously known constructions of respiratorspeech units which had a peripheral aperture for passage of air betweenthe edge of the speech transmitter disc and the frame and an annularflexible seal operating to close that passage.
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