Dual control mode lock

Details Dual control mode lock Dual control mode lock

1993-11-12

1995-06-13

Gall, Lloyd A.

Locks

Operating mechanism

Using a powered device

70283, E05B 4902

Patent

active

054231981

ABSTRACT:
A security system requires the bringing together, at the locking mechanism to be operated from a locked to an unlocked state, of a properly bitted mechanical key and the generator of a digitally coded electrical command signal. The electrical command signal is transmitted through the lock to an actuator so that the lock, when enabled by insertion of the mechanical key, may be operated. The key may define a portion of the signal transmission path between the command signal generator and the actuator.

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patent: 4745785 (1988-05-01), Uebersax
patent: 4761976 (1988-08-01), Kleinhany
patent: 4771620 (1988-09-01), Kleinhany
patent: 4789859 (1988-12-01), Clarkson et al.
patent: 4854146 (1989-08-01), O'Connell et al.
patent: 4939915 (1990-07-01), Vonlanthen
patent: 4998952 (1992-03-01), Hyatt, Jr. et al.
patent: 5140317 (1992-08-01), Hyatt, Jr. et al.

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