Fence with security wires fastened to posts via sensors

Details Fence with security wires fastened to posts via sensors Fence with security wires fastened to posts via sensors

1985-10-30

1988-04-05

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340518, 340668, G08B 1300

Patent

active

047361948

ABSTRACT:
A fence having security wires fastened to posts via sensors and having an electronic evaluation circuit connected to the sensors, which releases an alarm signal when one of the sensors signals a contact of the security wire which is connected to it. Each sensor has a housing fastened to a post, a holder connected to a security wire and a transformer placed between housing and holder, which produces a signal which is approximately proportional to the position of the holder. An alarm signal is generated when one or only a few security wires move slowly, yet such slow movements are ignored when caused by environmental factors. A highly reliable security fence is thus obtained.

REFERENCES:
patent: 4124848 (1978-11-01), Clark et al.
patent: 4155083 (1979-05-01), Slaats et al.
patent: 4249207 (1981-02-01), Harman et al.
patent: 4367459 (1983-01-01), Amir et al.
patent: 4591834 (1986-05-01), Kyle

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