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Interlocking shafts 3

Only one disk can rotate at a time. The second disk is locked due to the engagement of its concave arc with peripherical surface of the first disk.

Radius of the concave arc of one disk is equal to outer radius of the other disk.

The mechanism is used in case the concurrent motions can cause damage. Disadvantage: need to bring the mechanism to initial position for changing the moving shaft.

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