Combined pressure relief and indicator mechanism

Details Combined pressure relief and indicator mechanism Combined pressure relief and indicator mechanism

1978-10-16

1982-10-05

Pollard, Steven M.

Receptacles

Container attachment or adjunct

Pressure relief means

137 68R, B65D 2500

Patent

active

043524370

ABSTRACT:
A combined pressure relief and pressure indicating mechanism includes a diaphragm closing a vent in a housing. The diaphragm is punctured if an excessive overpressure occurs in the housing to relieve same. A movable indicator is held from moving by the diaphragm as long as the housing pressure exceeds a minimum value. If the housing pressure falls below this value the indicator moves, its movement giving a visual indication of an underpressure.

REFERENCES:
patent: 2230961 (1941-02-01), Lewis
patent: 2378135 (1945-06-01), Evans
patent: 2505456 (1950-04-01), Beecher
patent: 3109555 (1963-11-01), Samans
patent: 3229848 (1966-01-01), Chabala
patent: 3845878 (1974-11-01), Carlson
patent: 4085764 (1978-04-01), Raidl, Jr.
patent: 4134515 (1979-01-01), Hills et al.

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