Importance

Loading Importance Indicators...

Abstract

A combination lock for a safe or the like is provided that is fully computerized and self powered. A rotary dial is connected to a stepper motor/generator to provide the electrical power to a capacitor to power the system. The stepper motor/generator also provides input signals in the form of a code sequence to a microprocessor that processes the signals to initiate the operation of a drive motor to release a lock bolt once the proper combination is dialed. A read only memory (ROM) determines the proper combination from a combination storage means and feeds the combination to the microprocessor for comparison to the inputted signals from the dial. As each combination dialing sequence is begun, a random code initiator provides a different starting position in the sequence so that electronic or visual surveillance equipment cannot be used to surreptitiously obtain the combination. In order to thwart computerized input dialing to open the lock assembly, a dial speed sensitive lockout device also controls the microprocessor. During the combination dialing, a display unit presents the code and direction of movement of the sequence for observation by the person dialing the combination.

Loading the Abstract Image...

First Claim