Signals and indicators – Combined functions – Alarms with indicators
Patent
1979-05-09
1981-01-27
Yasich, Daniel M.
Signals and indicators
Combined functions
Alarms with indicators
116 70, 116266, 12820222, G01L 1912, G08B 700
Patent
active
042468647
ABSTRACT:
A device for indicating airtightness of a packing for apparatus which is to be stored under a vacuum and, particularly for protective breathing apparatus, comprises, a packing enclosing a packing space in which the apparatus is stored which has an outer surface with a recessed portion forming a chamber having a cover overlying the chamber enclosing and sealing it. A hollow expansible and retractable member, such as a bellows, is mounted in the chamber and has an opening to its interior extending through the packing into the interior of the packing space so that the pressure inside of the bellows is the same as the packing space. A ball is disposed between the bellows and the cover and it is held by expansion of the bellows against it in a fixed position which indicates an increase of the pressure within the packing beyond a predetermined amount. When the vacuum in the packing is sufficient, the pressure reduces and retracts the bellows so that the ball is freely movable in the space between the bellows and the cover.
REFERENCES:
patent: 3330249 (1967-07-01), Rodgers
patent: 3431773 (1969-03-01), Calhoun
patent: 3699914 (1972-10-01), Smith
patent: 3731295 (1973-05-01), Van Luyn
patent: 3948207 (1976-04-01), St. Paul
patent: 4105095 (1978-08-01), Thrasker, Jr.
Dragerwerk Aktiengesellschaft
Yasich Daniel M.
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