Coaxial Pedals of Opposite Direction Motions 04 May 2018, 13:00 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 a double slider-crank mechanism of common slider. Velocities of two pedals are the same. « previous mechanism Folding Plug next mechanism » Ratchet Mechanism load comments Please enable JavaScript to view the comments.