Pressure-change indicator

Details Pressure-change indicator Pressure-change indicator

1983-07-27

1986-04-22

Frankfort, Charles

Signals and indicators

Indicators

Fluid flow

73432R, G01L 2300

Patent

active

045834849

ABSTRACT:
The present disclosure relates to a pressure change indicator useful in determining whether the pressure-change/time values are exceeding safe levels. The device is constructed of clear plastic and employs a ball indicator in a cylindrical chamber operatively connected to an air reservoir. The reservoir is filled at the maximum dive depth with ambient air until air leaks from air outlets in the wall of the reservoir. As the air expands during the ascent it exits through the outlets. At excessive ascent rates, air cannot escape through the outlet fast enough and forces the ball indicator down the chamber past an indicator line alerting the diver.

REFERENCES:
patent: 2775123 (1956-12-01), Salle et al.
patent: 3121333 (1964-02-01), Alinari
patent: 3933049 (1976-01-01), Shamlian et al.
patent: 3992949 (1976-11-01), Edmondson

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