Patent ID: 6904778

Claim:
A combination lock comprising: a rotatable first gate wheel having a first gate; a rotatable second gate wheel having a second gate; at least one fence capable of being engaged with said first and second gates; a combination entry device capable of rotating said first and second gate wheels for varying an angular alignment between said first and second gates and said at least one fence, said first and second gates being aligned angularly with said at least one fence upon entry of a proper combination and at least one of said first and second gates being non-aligned angularly with said at least one fence upon entry of one of a plurality of improper combinations; a lock bolt actuatable between a locked position and an unlocked position; a lock-bolt drive mechanism capable of actuating said lock bolt from said locked position to said unlocked position after entry of said proper combination and capable of attempting to actuate said lock bolt from said locked position to said unlocked position after entry of one of said plurality of improper combinations; and a combination scrambler configured to rotate said first gate wheel by first and second different angular increments if said lock-bolt drive mechanism attempts to actuate said lock bolt from said locked position to said unlocked position after entry of successive improper combinations.