Apparatus for mutual information transmission in a lock and key

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

1985-01-28

1986-07-22

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 34082569, 34082572, 343 68R, 361172, G06F 704

Patent

active

046022538

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.

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patent: 4333072 (1982-06-01), Beigel
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patent: 4388524 (1983-06-01), Walton
patent: 4473825 (1984-09-01), Walton
Co-Pending Kreft U.S. patent application Ser. No. 481,385, filed Apr. 1, 1983, now U.S. Pat. No. 4,549,176.

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