Point M of connecting rod 2 in the four-bar drag-link 1 inkage AECD describes connecting-rod curve a-a with one point of self-intersection. Slider 4 is connected by turning pair M to connecting rod 2 and slides in slotted link 5 which rotates about fixed axis B. Crank 3 is designed as a collar encircling fixed disk 6 which has its centre at point A. Owing to the shape of the connecting-rod curve a-a, slotted link 5 makes two complete revolutions about axis B to each revolution of cranks 1 and 3.
$1020$LG,6L$