... 2009 19 04 2010 19 04 2010 couplings shafts A center-point curve is the locus of feasible fixed pivot locations for a planar RR dyad that will guide the coupler through four finitely separated positions. The theory, originally formulated by Burmester ( 1 ), is described...

...Paul Milenkovic Congruent triangles establish that a class of intersecting-shaft couplings is constant velocity. These mechanisms employ a pair of linkages in parallel: a spherical joint at the intersection of the shafts and the intersection of straight-line tracks away from the shaft center...