I designed a shear for a conveyor process using this 2:1 hypo cyclodial idea. (Same as this one). It worked quite well. The military was looking at a 2 stroke engine that employed a cyclodial crankshaft using this design for small drone engines. The idea was to reduce the piston side wear by reducing angular forces that conventional crankshafts produce. To me these kinds of mechanisms are poetry in motion and often over looked.