When piston 1 is moved to the left by the action of fluid delivered to the right end of its cylinder, the clamping force is transmitted to levers 2 through flat springs 3. One end of the springs is rigidly secured to the levers and the other, bent into a loop, engages an annular groove of collar 4 which is mounted on piston rod 5. Eight levers 2 turn about fixed axes A, clamping the workpiece which is located on its bore a at eight points. The workpiece is released and the levers are retracted within the bore when piston 1 is moved to the right by spring 6.
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