This linkage is a special case of a slider-crank with a curve tracer at the right end of the sliding link. The curve traced out by this point is similar to the conchoids of a circle [See Abstract of Model S-20]. The conchoid of a circle has an extremely flat section in the closed loop that for practical purposes represent a straight-line motion. Reuleaux attributes this design to the German engineer Reichenbach.

Francis Moon 2004-07-00