Keeping Direction Unchanged During Rotation 22 May 2017, 19:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! The direction of the red object is unchanged. Using parallelogram mechanism. Overcoming dead point by adding second parallelogram mechanism « previous mechanism Screw Gear Drive next mechanism » Application of Rack Pinion Mechanism load comments Please enable JavaScript to view the comments.