Locks – Operating mechanism – Using a powered device
Patent
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.
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Dino Suzanne L.
Kontler Peter K.
Theodor Kromer GmbH & Co. KG Spezialfabrik Fur Sicherheitsschlos
Trettel Michael F.
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