Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1980-10-24
1982-03-30
Yusko, Donald J.
Registers
Systems controlled by data bearing records
Credit or identification card systems
340543, 34082532, 361190, E05B 4900, H04Q 300
Patent
active
043227198
ABSTRACT:
A coded key operated solid state entry system for a controlled access to a multiplicity of electronic circuits by the use of corresponding coded keys embodying a detection and monitoring system, the detection and monitor system being activated by the insertion into the keyway of a coded key particularly adapted to successively engage a plurality of switches which engage a timer for a timed interval of key insertion and which energizes a circuit to unlatch normally latched tumblers and which upon rotation by the key to the extent of the code of the key, an optic coupling circuit is energized and the code of the tumblers is read, the optic coupler interfaces with a comparator which functions to match the code read with a corresponding coded electronic circuit. If the code is not matched with a corresponding circuit, the timed interval of the timer will expire and the circuit unlatching the tumblers will be caused to become de-energized locking up the tumblers and the key. If the code is matched to a circuit, the timer circuit is re-set for another interval of time for the return of the tumblers of their initial position, for the withdrawal of the key, access to the corresponding circuit having been achieved by the matchup.
REFERENCES:
patent: 2831129 (1958-04-01), Penney
patent: 3165599 (1965-01-01), Clay
patent: 3639906 (1972-02-01), Tritsch
patent: 3657496 (1972-04-01), Davidson
patent: 3663774 (1972-05-01), Feder
patent: 3854120 (1974-12-01), Matto
patent: 4107655 (1978-08-01), Moorhouse
patent: 4258358 (1981-03-01), Lee et al.
patent: 4277777 (1981-07-01), Shulz et al.
Gregory Leo
Yusko Donald J.
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