When piston 1 is moved to the right by the action of fluid delivered to the left end of its cylinder, gear rack 2, rigidly attached to the piston rod, turns pinion 3 about fixed axis A. Pinion 3 is rigidly secured to lever 4. Link 5 is connected by turning pairs B and C to lever 4 and to clamping lever 6 which turns about fixed axis D. Lever 6 clamps workpiece 7 which is located on pin 8. Workpiece 7 is released in the return stroke of piston 1.
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