When piston 1 moves to the right by the action of fluid delivered to the left end of the cylinder, hinged clamp 3 clamps workpiece 2. Clamp 3 is connected by turning pair A to movable jaw 4 which is rigidly attached to rod 5 of piston 1. As piston 1 is moved to the left by spring 6, workpiece 2 is released.
$3851$LHP,GC$