Electronic combination lock and system

Details Electronic combination lock and system Electronic combination lock and system

1977-12-14

1978-11-28

Wolfe, Robert L.

Locks

Operating mechanism

Using a powered device

70280, 235449, 340149R, 361172, E05B 4902

Patent

active

RE0298468

ABSTRACT:
A unitary self-contained electronic combination lock is provided which includes a dead bolt manually operable from one side and operable from the other side only in response to insertion of a data combination card carrying a unique binary code in the form of selectively positioned metallic spots. Sensors located within the unit generate a binary 1 or 0 signal in response to the presence or absence of a metallic spot adjacent each sensor. The lock combination code is automatically changed to the data card's code upon insertion of a card having a code combination which includes part of the lock's code so that the previously issued cards will no longer operate to unlock the door. In this manner, the authorized code for each lock unit is automatically and independently changed to render inoperative all previously issued data cards.

REFERENCES:
patent: 463297 (1891-11-01), Starrett
patent: 608321 (1898-08-01), Carleton
patent: 1938150 (1933-12-01), Marateck
patent: 3625033 (1971-12-01), Subieta
patent: 3787812 (1974-01-01), Armstrong
patent: 3800284 (1974-03-01), Zucker
patent: 3821704 (1974-06-01), Sabsay

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