When piston 1 moves to the right by the action of fluid delivered to the left end of cylinder 7, workpieces 2 and 3 are clamped by clamp 4, hinged to rod 5, and clamp 6, rigidly attached to cylinder 7. At the same time, clamp 6, moving to the left with cylinder 7, pushes pin 8 which turns clampieces 9 about fixed axis A, clamping third workpiece 10. The workpiece are released and the cylinder, piston and clamps are returned to their initial positions by springs 11, 12 and 13.
$3854$LHP,GC$