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US 5,847,656 AGranted
Electronic combination lock with high security features
AssigneeC&M Technology, Inc.
InventorsGerald Lee Dawson, Daniel Lee Thompson, J. Clayton Miller, Michael P. Harvey
Life of this patent
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Abstract
An electronic combination lock includes a combination lock having a dial with no markings thereon. Rotation of the dial drives a generator which produces electrical pulses. The voltage pulses serves as a power source for the electronics of the lock. The lock also includes a security feature to disable the lock if the combination dial is stopped between dial rotations for a period of time which indicates dialing by an automatic dialer.
Claims7
An electronic combination lock comprising a dial means for inputting combination elements;
- generator means driven by said dial means for powering said electronic lock and for converting said inputting of said combination elements into electrical signals;
- microprocessor means for receiving said signals and for utilizing said signals to control the operation of said microprocessor;
- display means for displaying, to an operator, numbers to be incremented and decremented to enter numerical elements of the combination into the lock;
- said microprocessor further comprising means for timing the period from the time said microprocessor is activated until said combination has been entered;
- means for storing a value defining a predetermined time period selected as the longest acceptable time period within which said combination may be entered into said lock;
- means for comparing said period to said predetermined time period;
- and
- means responsive to said means for comparing to condition said lock to not unlock when said period is greater than said predetermined time period.
5 more elements
Dependencies are inferred from the claim text.