Gas-operated apparatus for making a noise under water
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United States of America Patent
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Dec 20, 1994
Grant Date -
N/A
app pub date -
Aug 2, 1993
filing date -
Aug 2, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Gas-operated apparatus (2) for making a noise underwater, comprising a body (4), a diaphragm (6) which extends over the body (4) to define a chamber (8) between the body (4) and the diaphragm (6), a gas inlet nozzle (10) which extends into the chamber (8) and which engages an inner surface (12) of the diaphragm (6), and gas outlet means (14) for enabling gas in the chamber (8) to leave the chamber (8), the diaphragm (6) being made of an elastic material, the diaphragm (6) being such that it has an outer surface (16) which is in contact with a liquid, and the apparatus (2) being such that in use gas under pressure passes through gas inlet nozzle (10) and causes the diaphragm (6) to expand and collapse over a region of the diaphragm (6) that is in contact with the gas inlet nozzle (10) thereby to create noise which is adapted for optimum underwater transmission due to the diaphragm (6) being in contact with the liquid.
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