When piston 1 is moved to the right by the action of fluid delivered to the left end of its cylinder, pinion 2, mounted on axle A which is pressfitted into the piston rod 3, also moves to the right, actuating both gear racks, 4 and 5. Upper rack 4 is integral with a wedge whose motion turns cam levers 6 about fixed axes D so that they locate workpiece 7 by its circular recess. Lower rack 5 carries crosspiece 8 whose ball-shaped ends enter slots in two plungers 9. As they move to the right (see view facing arrow 11), plungers 9 clamp workpiece 7 against the top plate through two pushers 10 which slide along inclined slots in plungers 9. Thus, in the working stroke of piston 1, pinion 2 moves both gear racks until the workpiece is located. This stops rack 4 and pinion 2 begins to rotate, moving rack 5 to the right until the workpiece is firmly clamped.
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