Combination lock with motor-driven tumblers

Details Combination lock with motor-driven tumblers Combination lock with motor-driven tumblers

1990-07-19

1993-02-09

Trettel, Michael F.

Locks

Operating mechanism

Using a powered device

70303A, 70333R, 70446, E05B 4900, E05B 1700

Patent

active

051844915

ABSTRACT:
A combination lock wherein the tumblers can be moved to predetermined positions, preparatory to retraction of the locking bolt from extended position, by an electric motor which is controlled by a microprocessor. The microprocessor receives signals from a keyboard or from a disc and can start the motor for the purpose of aligning the normally scrambled tumblers only in response to reception of a predetermined sequence of signals. A manually operated knob can be coupled to a driver for the tumblers in order to change the positions of the tumblers and/or to move the locking bolt between extended and retracted positions independently of the motor. The microprocessor is programmed to start the motor only in response to reception of a predetermined sequence of signals in accordance with a selected combination.

REFERENCES:
patent: 3797936 (1974-03-01), Dimitriadis
patent: 3812303 (1974-05-01), Gartner
patent: 4073518 (1978-02-01), Goodwin
patent: 4125008 (1978-11-01), Genest et al.
patent: 4148092 (1979-04-01), Martin
patent: 4177657 (1979-12-01), Aydin
patent: 4433563 (1984-02-01), Wilson
patent: 4457148 (1984-07-01), Johansson et al.
patent: 4745784 (1988-05-01), Gartner
patent: 4754625 (1988-07-01), McGourty et al.
patent: 4803860 (1989-02-01), Moore
patent: 4831851 (1989-05-01), Larson
patent: 4904984 (1990-02-01), Gartner et al.
patent: 4905490 (1990-03-01), Wilson
patent: 4956984 (1990-09-01), Chi-Cheng
patent: 4967577 (1990-11-01), Gartner et al.
patent: 5017851 (1991-05-01), Heinzman

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