Fence alarm

Details Fence alarm Fence alarm

1975-09-02

1977-01-25

Caldwell, John W.

Communications: electrical

Systems

Call station

340261, 256 1, 200182, G08B 2300

Patent

active

040053970

ABSTRACT:
A sound or other such alarm which in practice is mounted on a fence so as to signal any attempt to surmount or bypass the fence, such attempt being an alarm condition; such alarm being characterized by its ability to distinguish said alarm condition from non-alarm conditions, thus having minimal false alarms, even though in all instances the alarm basically is triggered into operation in response to vibratory movement of the fence. This ability of the alarm to distinguish between alarm and non-alarm conditions is achieved by requiring a selected number of alarm-operating pulses (i. e. a selected number of vibrations in the fence) before the alarm operates.

REFERENCES:
patent: 2345771 (1944-04-01), Reynolds
patent: 2403503 (1946-07-01), Coulter
patent: 3276007 (1966-09-01), White
patent: 3745552 (1973-07-01), Wilt
patent: 3763482 (1973-10-01), Burney et al.
patent: 3806909 (1974-04-01), Bound

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