Security bar rack

Details Security bar rack Security bar rack

1983-07-11

1987-02-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340506, 340691, 109 42, 200 6193, G08B 1300

Patent

active

046460675

ABSTRACT:
A security bar rack for installation in the inlets or outlets of water-treatment plants or power stations comprises a number of hollow tubes. A conductive indicator element with uninsulated external surfaces is stretched within each tube and extends over its entire length. Each indicator element is provided with a separate monitoring circuit which actuates a signal element in a way that a detectable alarm signal is emitted if any change takes place in the dielectric condition of the indicator element/tube assembly. In addition a second signal element is provided which is controlled by the monitoring circuit so as to produce a detectable signal to indicate that the device is in a state of readiness to produce an alarm signal.

REFERENCES:
patent: 2578556 (1951-12-01), Johnston
patent: 2636163 (1953-04-01), Gardiner
patent: 3537094 (1970-10-01), Hawkins et al.
patent: 3623061 (1971-11-01), Mayhew
patent: 3924256 (1975-12-01), Cohen
patent: 4100537 (1978-07-01), Carlson
patent: 4155083 (1979-05-01), Slaats et al.
patent: 4350978 (1982-09-01), Riccobono
patent: 4356476 (1982-10-01), Healey et al.
patent: 4399434 (1983-08-01), Bielat

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