When piston 1 moves downward by the action of fluid delivered to the top end of the cylinder, motion is transmitted through yoke 2 and links 3 to levers 4 which turn about fixed axes A and clamp workpiece 5. The maximum clamping force is exerted at an angle α approaching 180°. Workpiece 5 is released when piston 1 is moved upward by spring 6.
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