Bench Seat Hinge 06 March 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! It is an application of 4 bar linkage. End open positions of the seat is kept firmly thanks the red spring. « previous mechanism Satellite Bevel Gear next mechanism » Multi-Plate Press load comments Please enable JavaScript to view the comments.