Hand Shearing Machine 14 December 2020, 19:53 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 4-bar linkage is used. Hand force is applied to one crank. The upper tool blade is fixed to the other crank. « previous mechanism Pin Spherical Joint next mechanism » Six-Wheeled Stair Climber load comments Please enable JavaScript to view the comments.