G - Physics – 08 – B
Patent
G - Physics
08
B
340/125, 331/56,
G08B 21/00 (2006.01) G07C 11/00 (2006.01)
Patent
CA 1098994
ABSTRACT OF THE DISCLOSURE A keyable control circuit, has sensing coils located in the vicinity of a plurality of locations where lock control is desired. At least one swept high-frequency oscillator, which is connected to each sensing coil, generates an rf signal, rapidly swept over a wide frequency band. When an external keying circuit, containing more than one resonant circuit, each correctly tuned to a predeter- mined keying frequency, is inductively coupled to a sensing coil, each resonant circuit absorbs rf energy as the oscillator frequency 18 swept past its resonant frequency. Energy absorption in the external keying circuit induces corresponding reductions in rf energy in the sensing coil as the oscillator frequency is swept past the keying frequencies. Tuned detectors within the keyable control circuit produce a control signal when energy reduction is sensed at each of the predetermined keying frequencies. If correct absorption fails to occur at any one or more of the predetermined frequencies, the control signal is withheld.
272024
Atkins Carl E.
Mcguirk Francis A.
Macrae & Co.
Wagner Electric Corporation
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