Tamper-evident electronic combination lock having integral beari

Details Tamper-evident electronic combination lock having integral beari Tamper-evident electronic combination lock having integral beari

1995-04-27

1997-07-15

Dino, Suzanne

Locks

Operating mechanism

Using a powered device

70332, 70333R, 292353, E05B 4900

Patent

active

056472358

ABSTRACT:
A user of a self-powered electronic combination lock rotates an outer dial to cause generators to generate energy for storage in a capacitor bank. The user then rotates an inner dial to cause a microcontroller to sequentially display a combination of numbers, and presses the inner dial to select a displayed number. The microcontroller determines direction and extent of motion of the inner dial by receiving signals derived from Wiegand sensors placed in proximity to a magnetized disc which rotates integrally with the inner dial, and controls the display of numerals on an LCD display accordingly. When the microcontroller determines that a correct combination has been entered, it activates a motor to move a motor cam to act directly on a locking lever so that the locking lever can engage a drive cam integrally linked with the inner dial, to allow the inner dial to withdraw the lock's bolt. Software features, as well as power level monitoring features, cause the locking lever to be moved away from the drive cam to prevent the bolt from being withdrawn if it has not already been withdrawn within a given time window. Integral bearing/retaining members make the lock dials tamper-evident. After a given number of successive incorrect combination entries, an "override" combination, which is preferably a longer, mathematical variation of normal combinations, is necessary to open the lock.

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