Lifting Mechanism 19 November 2016, 02:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! A nut portion is created on the lower rack and receives motion from a motor via the grey screw.If the motor rotates regularly, the top desk moves up irregularly like the slider of a slider-crank mechanism. « previous mechanism Differential Steelyard next mechanism » Car Differential With Bars load comments Please enable JavaScript to view the comments.