Pressure-responsive security alarm

Details Pressure-responsive security alarm Pressure-responsive security alarm

1988-07-12

1989-06-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340568, 340571, 340626, G08B 1308

Patent

active

048375551

ABSTRACT:
Apparatus is provided to evacuate an air-tight openable and closeable container to a sub-atmospheric pressure. A flexible diaphragm inside the container responds to a change in pressure to actuate an alarm. In one embodiment, a display case is evacuated via a one-way valve by connecting a pump thereto. In a different embodiment, a pump inside a hand-carried case evacuates the case via a one-way valve. Alternatively, at least one side of the case is flexible enough to evacuate the case by pushing thereon, with no pump being required.

REFERENCES:
patent: 2069953 (1937-02-01), Hopkins
patent: 4117468 (1978-09-01), Vasquez

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