An application of a slider crank mechanism: blue crank, green conrods, sliders: green pins sliding in slots of the base.
There is eccentric on each conrod. When turning the crank, these eccentrics center and clamp orange workpiece.
STEP files of this video:
http://www.mediafire.com/download/34z...
Inventor files:
http://www.mediafire.com/file/qv5ql9k...