Patent ID: 6202522
Filing Date: 2001-03-20
Classification: B23B,Y10T

Abstract:
A portable machine tool for preparing annular workpiece ends for welding, comprising:a rotary cutting head having axially forward and rearward sides, and including at least one cutter seat on the forward side thereof;a mandrel shaft extending axially through the cutting head; said cutting head supported on the mandrel shaft for relative rotation on and axial movement along the mandrel shaft;workpiece engaging elements movably carried by the mandrel shaft located towards the cutting head forward side and configured to be moveable relative to and to engage a workpiece located forwardly of and adjacent the cutting head;said workpiece engaging elements adapted to secure a workpiece located forwardly of and adjacent the cutting head and said mandrel shaft against relative rotation and axial motion when engaged with such workpiece;a feed mechanism carried by the mandrel shaft on the rearward side of the cutting head and cooperating with the mandrel shaft and cutting head to advance and retract the cutting head in axially forward and rearward directions along the mandrel shaft when actuated;a rotary drive coupling carried by the cutting head on its rearward side, said drive coupling drivingly connected to the cutting head and connectable in driving relationship with a rotary drive motor unit locatable rearwardly of the cutting head; anda torque reaction bar secured to the mandrel shaft rearwardly of the cutting head, the reaction bar non-rotatably secured to the mandrel shaft and including a drive motor unit engaging member adapted to engage a rotary drive motor unit locatable rearwardly of the cutting head and connectable to the rotary drive coupling and to secure such drive motor unit against rotation relative to the mandrel shaft when such motor is connected to the drive coupling.