Penta-Folding Gate 29 August 2017, 22:00 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 mechanisms and gears. There is no need of railway. If the construction is not heavy, the wheels can be removed. « previous mechanism Rack Pinion Mechanism next mechanism » Chain Drive load comments Please enable JavaScript to view the comments.