Respirator speech transmitter
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United States of America Patent
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-
Sep 10, 1985
Grant Date -
N/A
app pub date -
Aug 15, 1983
filing date -
Aug 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A respirator speech transmitter has a projecting tube with a one-way valve at one end and the other end being covered by a baffle having an inner skirt extending around the tube. An outer skirt extends from the tube to surround the inner skirt so that an annular convoluted passageway which increases in annular width as it extends from the tube formed between the outer surface of the tube, the inner skirt and the outer skirt. This convoluted passageway has excellent acoustic properties yet prevents ingress of contaminants. In a modification the valve is at the same end of the tube as the baffle.
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