Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1978-05-03
1980-09-02
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular coupling link
256 10, 340564, 340650, G08B 2100
Patent
active
042209498
ABSTRACT:
An electric fence monitor and alarm apparatus and method is provided in which the charge condition of an electric security fence is continuously monitored, and an indication is provided when the charge on the electric fence falls below a pre-determined level. In a preferred embodiment, the charge on the line causes a circuit to be maintained in an energized condition which maintains a relay or other switch means in a first condition preventing the energization of indicator means or alarm means such as sirens, automatic telephone dialers, horns and bells. When the charge on the line falls below a pre-determined level, the relay or other switch means is switched to a second state, after a pre-determined adjustable time delay, to cause the operation of the indicator, thereby alerting the proper personnel to a failure of the charge on the line for any reason. The failure of the charge on the line is often caused by an unauthorized cutting of the line.
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Childress Evelyn O.
Pope George F.
Caldwell Sr. John W.
Diversified Manufacturing & Marketing Co., Inc.
Myer Daniel
Petock Michael F.
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