Security system and signal carrying member thereof

Details Security system and signal carrying member thereof Security system and signal carrying member thereof

1987-12-01

1989-08-22

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340550, 340564, 340590, 340598, 340596, 340647, 174120SC, G08B 2900, H01B 700

Patent

active

048599891

ABSTRACT:
A security system comprising a signal-carrying member and a detector for detecting a change in the resistance of the conductive path surrounding a core of the signal-carrying member. The conductive path comprises inner and outer layers of semi-conductive tape separated by an insulating layer but interconnected at one end. The semi-conductive tape of at least the outer layer is made of fibrous material such as carbon-leaded PTFE such that when a sharp object pierces the outer layer and the insulating layer, semi-conductive fibers are dragged from the outer layer into contact with the inner layer and form a conductive bridge between the layers.

REFERENCES:
patent: 2581213 (1952-01-01), Spooner, Jr.
patent: 2691698 (1954-10-01), Schmidt
patent: 3633194 (1972-01-01), Kothe
patent: 3748369 (1973-07-01), Durakis et al.
patent: 3750127 (1973-07-01), Ayers et al.
patent: 3763482 (1973-10-01), Burney et al.
patent: 4155083 (1979-05-01), Slaats et al.
patent: 4450434 (1984-05-01), Nielsen et al.
patent: 4453159 (1984-06-01), Huff et al.

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