Respirator speech transmitter
AssigneeAvon Industrial Polymers Limited
InventorCyril E. N. Angell
Life of this patent
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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.
Claims10
A speech transmitter for a respirator comprising:
- a hollow tube having a first open end for facing outwardly of the respirator and a second open end for facing inwardly of the respirator nearer to the mouth of a user;
- a baffle spaced from and extending over said first open end of said hollow tube, said baffle having an inner skirt extending around at least a part of said tube;
- an outer skirt extending from said tube around said inner skirt;
- the outer surface of said hollow tube, said inner skirt, and said outer skirt defining an annular convoluted passageway extending from said first open end of said tube, said annular passageway increasing in annular width as it extends from said first open end of said tube;
- and
- uni-directional valve means located in said transmitter for permitting air flow through the tube in the direction from the second end to the first end and then into said convoluted passageway.
Dependencies are inferred from the claim text.