Electronic combination lock with covert entry detection feature

Details Electronic combination lock with covert entry detection feature Electronic combination lock with covert entry detection feature

1993-03-24

1996-02-20

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340542, 34082534, 70280, G06F 704

Patent

active

054932793

ABSTRACT:
An electronic combination lock is provided with and incorporates the enhanced feature of covert entry detection and notification. Whenever the bolt of an electronic lock provided with this enhancement is retracted to its withdrawn or unlocked position and whenever the lock has not received an authorized combination enabling the movement of the bolt, movement of the bolt is detected and the electronics of the lock is powered for a time sufficient to record an indication of the covert entry in its non-volatile memory. Upon normal operation at a subsequent time, the indication of covert entry is read from the non-volatile memory and a visual indication is displayed to the operator to inform the operator that covert entry has occurred. The lock may be configured either to permit the lock to open with an authorized combination after display of the covert entry indication to the operator; or alternatively, the lock may be configured to be disabled as a result of the detection of a covert entry such that the lock will refuse to accept all authorized combinations until such time as the lock has been reset or reconditioned to remove the covert entry indications stored in the memory.

REFERENCES:
patent: 4370644 (1983-01-01), Droz
patent: 4684945 (1987-08-01), Sanderford, Jr.
patent: 5061923 (1991-11-01), Miller et al.
patent: 5083122 (1992-01-01), Clark

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