Connecting rod 4 is connected by turning pair C to slider 5 which moves along fixed guides b-b. Connecting rod 4 is connected by turning pair A lo connecting rod 2 of four-bar drag-link linkage DEFB. Crank 3 is designed as a collar encircling fixed round disk 6 with its centre at point B. Point A of connecting rod 2 describes connecting-rod curve a-a whose portions q-q and m-m, shown by continuous lines, approximate circular arcs with centres at positions of point C and of a radius equal to length C͞A of connecting rod 4. While point A travels along these portions of its path, slider 5 is practically stationary, i.e. it has two dwells in its extreme positions.
$1647$SC,D$