Signals and indicators – Alarms – Fluid-pressure variation
Patent
1999-06-07
2000-12-05
Hirshfeld, Andrew H.
Signals and indicators
Alarms
Fluid-pressure variation
116 27, 367141, G01C 1900
Patent
active
061551961
ABSTRACT:
A simple mechanical device is provided which generates acoustic signals at ne or more specified depths. The device consists of a spring loaded piston placed in a wall of a housing, the spring loading biasing the piston away from the housing. The piston is subjected to a pressure differential between the exterior and interior of the housing such that the piston moves against the spring force and into the housing as the pressure differential, corresponding to a depth of the housing beneath a water surface, increases. As the piston moves further into the housing, it contacts a series of latches, each latch being used to detain spring loaded striker. The latches are spaced along the travel path of the piston such that each striker is associated with a specific piston movement, or depth. When the piston contacts a latch, the striker is released and strikes against a ledge within the housing, creating one of the acoustic signals.
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Gauthier Robert W.
Sullivan Edmund J.
Gauthier Robert W.
Hirshfeld Andrew H.
Lall Prithvi C.
McGowan Michael J.
The United States of America as represented by the Secretary of
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