Connecting rod 4 is attached by turning pair D to connecting rod 2 of slider-crank linkage ABC. Connecting rod 4 drives link 5 which is designed as a truck with wheels 6 rolling along guides a-a. At positions of slider 3 near to its extreme upper position, a portion of the path of point D can be approximated by the arc of a circle of radius D͞E. When crank 1 rotates about fixed axis A, slider 3 and truck 5 reciprocate. The time that truck 5 is in its upper extreme position is longer than for slider 3.
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