Four identical pulleys 6, 7, 8 and 9 rotate about axes D, E, K and M of platform 2 which is to be raised and lowered. Pulleys 3, 4 and 5 rotate about fixed axes H, B and F. Two identical pulleys 10 and 11 rotate about fixed axes A and C. Flexible link 12, shown by dot-and-dash lines, runs over pulleys 7, 6, 5, 4, 3, 9 and 8, and is attached to the base at points S and T. Flexible links 13 and 14 run over pulleys 10 and 11, and are attached to platform 2 at points N and L, and to counterbalancing weights 1 and 1' at points 0 and R. Platform 2 is raised or lowered by rotating drive pulley 4 about axis B: clockwise to raise and counterclockwise to lower the platform which has translational motion along axis y-y.
$3560$CFL,MH$