Two identical conical pulleys 1 and 2 rotate about fixed axes A and B. One end C of flexible link 3 is secured to pulley 1 and the other end, D, to pulley 2. When pulley 1 rotates at uniform speed, flexible link 3 is wound on pulley 1 and unwound from pulley 2, and the latter has variable (gradually decreasing) speed because of the varying transmission ratio.
$3490$SFL,4L$