Folding a Rectangular Frame 24 February 2019, 19:30 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! It is an application of scissor mechanisms. Length ratio of the rectangle two sides is around ½. « previous mechanism Gear, Rack and Linkage Mechanism next mechanism » Female Taper Measurer load comments Please enable JavaScript to view the comments.