Portable tube end cutting tool

Claim 1

A TUBE END CUTTING TOOL COMPRISING AN EXPANSIBLE CHUCK, A ROTARY CUTTER HEAD MOUNTED IN OPPOSED SPACED RELATION TO SAID CHUCK FOR MOVEMENT TOWARDS AND AWAY FROM SAID CHUCK, MEANS FOR MOVING SAID CUTTER HEAD TOWARDS AND AWAY FROM SAID CHUCK, A PNEUMATIC MOTOR, INDEPENDENT OF SAID CUTTER HEAD MOVING MEANS, MOUNTED BEHIND SAID CUTTER HEAD, A PULL ROD EXTENDING THROUGH SAID ROTARY CUTTER HEAD AND CONNECTING SAID MOTOR TO EXPANSIBLE PARTS OF SAID CHUCK, FOR EXPANDING SAID CHUCK WHILE MAINTAINING THE SPACING BETWEEN SAID CUTTER HEAD AND SAID CHUCK UNCHANGED, A SEPARATE PNEUMATIC MOTOR FOR ROTATING SAID CUTTER HEAD, AIR LINES FOR SUPPLYING AIR TO BOTH SAID PNEUMATIC MOTORS FROM A COMMON SOURCE OF AIR UNDER PRESSURE, MANUALLY OPERABLE VALVE MEANS INTERPOSED IN SAID AIR LINES TO OPEN AND CLOSE SAID AIR LINES AND MEANS COOPERATING WITH THE VALVE MEANS IN SAID PULL ROD MOTOR AIR SUPPLY LINE TO PREVENT OPENING OF THE VALVE MEANS IN SAID CUTTER HEAD MOTOR AIR SUPPLY LINE EXCEPT WHEN SAID PULL ROD MOTOR VALVE IS SET TO RETRACT SAID PULL ROD TO EXPAND SAID CHUCK.