Combination lock monitoring system

Details Combination lock monitoring system Combination lock monitoring system

1982-01-06

1984-06-12

Holko, Thomas J.

Locks

Parts, attachments, accessories and adjuncts

Condition indicators

70432, 116 8, 340542, E05B 3904

Patent

active

044533900

ABSTRACT:
A combination lock monitoring system for recognizing and indicating electronically the condition of operation of the lock, the recognition being achieved by photo sensitive means responding to the light reflecting quality of areas on the lock bolt mechanism, the lock drop arm and a combination wheel of the combination lock, the electronic circuit responding through a binary code to the condition of the photo sensitive means, and the indication including a visual display.

REFERENCES:
patent: 2788519 (1957-04-01), Caldwell
patent: 2923928 (1960-02-01), McLaughlin
patent: 3093994 (1963-06-01), Richard
patent: 3225576 (1965-12-01), Richard
patent: 3227888 (1966-01-01), Sheperd et al.
patent: 3392558 (1968-07-01), Hedin et al.
patent: 4152589 (1979-05-01), Mitchell

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