Torque controlled machine tool

Claim 1

IN A MECHANISM OF THE CLASS DESCRIBED THE COMBINATION OF A FIXED SUPPORT, A SPINDLE CARRIER CARRYING A TOOL ON SAID SUPPORT FOR AXIAL MOVEMENT RELATIVE THERETO, A SPINDLE DRIVING SLEEVE ON THE SPINDLE, A PRIME MOVER, MEANS CONNECTING THE PRIME MOVER AND SPINDLE DRIVING SLEEVE FOR ROTATING THE SPINDLE, A YIELDABLE COUPLING IN SAID SPINDLE ROTATING MEANS YIELDABLE TO TORQUE ON SAID SPINDLE AND ITS TOOL WITH SAID COUPLING INCLUDING A PLATE ENCIRCLING THE SPINDLE DRIVING SLEEVE AND MOVABLE AXIALLY OF THE SPINDLE, DISPLACEABLE MEANS ON SAID SPINDLE DRIVING SLEEVE IN OPERATIVE CONNECTION WITH THE PLATE, FLUID PRESSURE MAINTAINING OPERATIVE CONNECTION BETWEEN THE PLATE AND DISPLACEABLE MEANS AND ESTABLISHING A GIVEN PRESSURE ON SAID DISPLACEABLE MEANS AND DETERMINING THE TORQUE DELIVERABLE BY THE SPINDLE AND ITS TOOL, MEANS ESTABLISHING THE NORMAL PRESSURE ON SAID DISPLACEABLE MEANS, AND MEANS ASSOCIATED WITH THE FIXED SUPPORT AND MOVABLE SPINDLE CARRIER FOR VARYING THE SAID EFFECTIVE TORQUE LOAD ON THE SPINDLE AND ITS TOOL.