Anti-theft device with disabling means

Details Anti-theft device with disabling means Anti-theft device with disabling means

1976-04-09

1978-08-08

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340566, 340545, G08B 1300

Patent

active

041060008

ABSTRACT:
A sensing means is connected to the input of an electronic circuit for triggering a signalling means. The electronic circuit includes a continuous differential amplifier whose two inputs (-) and (+) are connected to the terminals of the sensing means. The input terminals are also connected by means of at least two switches to voltage sources in such a way that, by closing one of the switches, the polarity of the input terminal in question is reversed, to disable the detection device, and, by closing the other switch means, there is an increase, with the same sign, in the polarity of the input in question, for triggering the signalling means.

REFERENCES:
patent: 3717864 (1973-02-01), Cook et al.
patent: 3771152 (1973-11-01), Dettling et al.
patent: 3781854 (1973-12-01), Kaufman et al.
patent: 3930226 (1975-12-01), Plumberg

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