When piston 1 is moved to the left by the action of fluid delivered to the right end of toits cylinder, gear rack 2, rigidly attached to the piston rod, turns pinion 3 about fixed axis D. This turns eccentric 4 which is keyed to the pinion shaft, actuating clamping lever 6. With its other end lever 6 clamps workpiece 5. When piston 1 is moved to the right, workpiece 5 is released.
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