Flexible link 2 runs over pulleys 1, 5 and 6 of equal diameter. Link 3 is connected by turning pairs C and B to flexible link 2 and to link 4 which turns about fixed axis A. When point C travels along the straight portions of its path, the motions of links 3 and 4 are equivalent to those of the connecting rod and crank of an offset slider-crank mechanism. When point C travels along the circular portions of its path, the motions of links 3 and 4 are equivalent to those of the connecting rod and rocker arm of a four-bar linkage in which the length of the crank equals the radius of the pulleys.
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