R. F. lockout circuit for electronic locking system

Communications: electrical – Continuously variable indicating – With meter reading

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Details

3408253, 34082572, 361172, H04Q 100, G06F 1520

Patent

active

049965255

ABSTRACT:
An electronics lockout circuit including an antenna adapted to receive ra frequency signals from a transmitter, and a radio frequency detector circuit which converts the radio frequency signals into a first direct current voltage indicative of the relative strength of the field resulting from the radio frequency signals. The first direct current voltage is supplied to a trigger circuit which compares this direct current voltage to an adjustable direct current reference voltage and provides a second direct current voltage at the output thereof whenever the amplitude of the first direct current voltage exceeds the amplitude of the reference voltage. The second direct current voltage provided by the comparator circuit is supplied to a disconnect relay circuit which upon receiving a signal from the electronic control unit of an electronic combination lock during the time period the second direct current voltage is present isolates the door strike coil of a security door from the electronic control unit. This prevents signals falsely generated by the electronic control unit because of radio frequency signals in the vicinity of the electronic control unit from energizing the door strike coil and thereby accidentally opening a security door.

REFERENCES:
patent: 2787731 (1957-04-01), Wetzger
patent: 2909769 (1959-10-01), Spaulding
patent: 3564501 (1971-02-01), Flook, Jr.
patent: 3621335 (1971-11-01), Coleman
patent: 3671816 (1972-06-01), Ritzow
patent: 3851227 (1974-11-01), Hedin
patent: 4196347 (1980-05-01), Hadley
patent: 4408251 (1983-10-01), Kaplan
patent: 4621258 (1986-11-01), Campman
patent: 4744021 (1988-05-01), Kristy

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