Folding Barrier 26 December 2017, 21:00 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 combination of parallelogram mechanism and 4-bar linkage. Folding barrier is used for height limited place. « previous mechanism Pick and Place Mechanism next mechanism » Ratchet Mechanism load comments Please enable JavaScript to view the comments.