Hobson's Coupler

A Hobson's Coupler (or Hobson's Joint) is a mechanism that diverts rotational power around a corner. Unlike a universal joint, it can function at an angle of 90 degrees and is a true constant velocity joint, but the angle is fixed at construction..

I designed these parts so I'd have a simple model to play around with. Three or more angled rods (there are four in this design) connect a pair of rotating cylinders (which each resembles the cylinder in a revolver). Each arm of a rod is free to