Signalling device
US5302055A · kind A · utility
10Cited by
7References
19Claims
0Family size
Inventor
Key dates
| Filing date | Jul 15, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Jul 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K9/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A signalling device for scuba divers uses their compressed air supply to drive a piston (42, 51, 72) against a diaphragm (22, 48, 49, 57, 63, 90) to generate sound in water against the diaphragm. A bistable valve 34, 52) switches pressurised air alternately to opposite ends of the piston (42, 51, 72) to cause it to reciprocate and repeatedly impact against the diaphragm (22, 48, 49, 57, 63, 90). Air is exhausted from the cylinder (11, 54, 70) through ports (27, 28, 29, 30, 110, 111, 73, 74), the ports being valved by movement of the piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.