Pulley 1 rotates about fixed axis A. Slide 3 moves along fixed guide b. Pulley 2 is connected by turning pair C to slide 3. Flexible link 4 is attached with one end at fixed point B and runs over pulleys 2 and 1. If end a of link 4 is pulled downward, slide 3 travels upward in guide b. Link 4 is tensioned by the weight of pulley 2 and slide 3.
$3542$CFL,ML$