Casing cutter and milling tool

Claim 1

IN A CUTTING TOOL FOR USE IN WELLS, A TUBULAR BARREL ADAPTED TO BE CONNECTED TO A TUBULAR OPERATING STRING FOR MOVEMENT WITH THE STRING IN A WELL BORE AND FORMED WITH CIRCUMFERENTIALLY SPACED, LONGITUDINALLY ELONGATED OPENINGS IN COMMUNICATION WITH THE BORE AND WITH THE EXTERIOR OF THE BARREL, CUTTER ELEMENTS MOVABLY DISPOSED IN SAID OPENINGGS FOR RADIAL MOVEMENT INTO AND OUT OF POSITIONS EXTENDING RADIALLY OUTWARDLY FROM THE BARREL, A TUBULAR MANDREL MOVABLY DISPOSED IN THE BARREL FOR LONGITUDINAL MOVEMENT THEREIN, MEANS FORMING A SEAL BETWEEN THE MANDREL AND BARREL TO CLOSE THE BARREL AGAINST THE FLOW OF FLUID THERETHROUGH EXTERNALLY OF THE MANDREL, MEANS ON THE MANDREL AND ELEMENTS POSITIONED FOR COACTION UPON DOWNWARD MOVEMENT OF THE MANDREL FROM AN UPPER POSITION TO MOVE THE ELEMENTS TO SAID EXTENDED POSITIONS, MEANS IN THE BARREL EXTENDING INTO THE MANDREL AND SHAPED FOR COACTION WITH THE MANDREL TO RESTRICT THE DOWNWARD FLOW OF FLUID THROUGH THE MANDREL TO CAUSE THE MANDREL TO MOVE DOWNWARDLY FROM SAID UPPER POSITION UPON AN INCREASE IN THE PRESSURE OF THE FLUID IN THE STRING AND TO FURTHER RESTRICT THE DOWNWARD FLOW OF FLUID THROUGH THE MANDREL WHEN THE MANDREL REACHES A PREDETERMINED POSITION OF ITS DOWNWARD MOVEMENT TO INCREASE THE FORCE EXERTED BY THE MANDREL ON THE ELEMENTS TENDING TO MOVE THE ELEMENTS RADIALLY OUTWARDLY AND YIELDABLE MEANS POSITIONED FOR COACTION WITH THE MANDREL AND BARREL TO YIELDINGLY RESIST DOWNWARD MOVEMENT OF THE MANDREL.