Apparatus for mutual information transmission in a lock and...

Details Apparatus for mutual information transmission in a lock and... Apparatus for mutual information transmission in a lock and...

E - Fixed Constructions

05

B

342/11.1

E05B 49/00 (2006.01) G07C 9/00 (2006.01)

Patent

CA 1217839

ABSTRACT An apparatus for mutual information transmission between an electronic lock and a key uses antenna coils at both the key and lock. A periodic signal is emitted from the lock and is received by the key upon activation of a key electronics and emission of a coded information signal. This returned signal received from the lock coil is briefly short-circuited or damped at the key side in order to produce a synchronization switch synchronizing the points in time of the signal appearance. Electronic converters are provided which, given the pre-condition that the short-circuit signal extends over a plurality of signal pulses, generate a digital signal corresponding to the short- circuit times.

472841

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