I'm looking for a purely-mechanical mechanism that will keep two rotating shafts at the same angle with a variable distance between them. The best ideas I've come up with so far are a pair of 4-bar mechanisms attaching to a third point or putting a keyed linear shaft through the two with bevel gears or universal joints, but is there anything better? I don't need full rotation, just 180 degrees. Any ideas?

+Nicholas Seward +Ryan Carlyle
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