APPARATUS FOR CENTERING AND CLAMPING ELONGATED WORKPIECES

摘要

Apparatus for centering and clamping tubes, rods or like workpieces has two double-acting cylinders which are reciprocable along parallel feed screws rotatably mounted in the frame of the apparatus. The feed screws have oppositely inclined mirror symmetrical threads meshing with internal threads provided on nuts which are adjustably fastened to the cylinders. The cylinders support mirror symmetrical work-engaging claws and receive pistons which are connected to each other by a piston rod extending midway between and being parallel with the feed screws. When the chambers of the cylinders receive a pressurized fluid so that the cylinders and their claws move toward or away from each other, the feed screws rotate and insure that the cylinders move at the same rate.