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US 5,200,932 AGranted
Underwater audible signalling device
OwnerBo H. G. Ljunginventor
Life of this patent
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Abstract
A signalling device with a long audible range is described, which is intended for underwater communication between divers. The device consists of a compact and lightweight horn and a rubber bulb. The horn, which works independently from a diver's supply of breathing air, is filled with water and operated by manually squeezing the rubber bulb.
Claims7
A device for projecting audible sound waves into a surrounding body of water comprising:
- a housing forming a liquid-filled chamber therein;
- and
- a diaphragm enclosing said chamber;
- and
- means for vibrating said diaphragm;
- and
- said vibrations projecting sound waves into said surrounding body of water and into said chamber;
- and
- means for containing said sound waves inside said chamber;
- and
- means for rendering said liquid in said chamber effectively compressible;
- and
- said means for containing sound waves in said chamber and said means for rendering said liquid compressible in said chamber comprise a compressible absorber incorporated in said chamber;
- said means for vibrating said diaphragm comprise a valve in communication with said diaphragm;
- and
- means to introduce liquid under pressure, into said chamber causing said valve to vibrate;
- and
- said valve comprises a reed partially closing an opening in said diaphragm;
- and means to affix one end of said reed to said diaphragm.
16 more elements
Dependencies are inferred from the claim text.