| 摘要 |
An improved respirator speech unit for the light-type or other model of respirator. The unit has a speech transmitter disc positioned within a frame. To the speech transmitter disc is secured a rigid valve seat disc. This valve seat disc is secured parallel to and coaxial with the transmitter disc so that, in position, it will be externally positioned in the frame. The valve seat disc is transversely seatable in the frame with its periphery cooperating with seal means in the frame to prevent passage of air between its periphery and the frame. The valve seat disc has a circular aperture for passage of exhaled air from the mask and defines, with the speech transmitter disc in position in the frame, an air passage from within the mask to this aperture. A flexible circular outlet valve is secured at its center to the other end of the frame, the valve being aligned with the aperture and resting thereon so that, when in position, this valve permits passage of air from the mask through the aperture, but seals the aperture to prevent entry of outside air into the mask. A respirator speech unit according to this construction is more reliable and more serviceable than the previously known constructions of respirator speech units which had a peripheral aperture for passage of air between the edge of the speech transmitter disc and the frame and an annular flexible seal operating to close that passage.
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