Locks {combination lock}| can have three discs. First disc connects to a knob and has a protrusion. The protrusion hits a protrusion on second disc, which has a protrusion that hits third-disc protrusion. Turning knob, to turn first disc two complete clockwise turns, engages the three discs. At first number, knob stops and turns counter-clockwise. Only first disc moves. After complete turn, second disc engages again. At second number, knob stops and turns clockwise. Only first disc moves. At third number, first disc stops and disc notches align. Bolt can slide past disc edges.
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7-Machine-Kinds-Mechanical-Lock
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Date Modified: 2022.0224