Depth sensitive mechanical acoustic signal generating device

Details Depth sensitive mechanical acoustic signal generating device Depth sensitive mechanical acoustic signal generating device

1999-05-17

2000-11-07

Hirshfeld, Andrew H.

Signals and indicators

Alarms

Fluid-pressure variation

116 27, 116268, 367141, G01L 1900

Patent

active

061420948

ABSTRACT:
A simple, mechanical device is provided which produces an acoustic signal a specified depth. The device consists of a shear plug in an exterior wall of the device housing which prevents the movement of a spring biased piston. The plug is subjected to increasing differential pressure between the exterior and interior of the housing as the depth of the device beneath the water surface increases. At a known pressure differential, corresponding to a specified depth, the shear plug fails, allowing for the actuation of the piston. The spring biased piston strikes against a ledge in the device, creating the acoustic signal.

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patent: 5233570 (1993-08-01), Donskoy

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