Rotary pipe cutting device having pipe clamping means and ratchet feed means for thecutter

Claim 1

A ROTARY CUTTING DEVICE FOR SEVERING PIPE, COMPRISING A SEGMENTED TUBULAR BODY ARTICULATED FOR DISPOSITION AROUND A PIPE TO BE SEVERED, PIPE-GRIPPING MEANS MOUNTED INTERIORLY OF THE BODY FOR SECURELY GRIPPING THE PIPE, A SEGMENTED CUTTER SUPPORT RING ROTATABLY MOUNTED ON THE BODY TO ROTATE ABOUT THE PIPE, DRIVE MEANS MOUNTED ON THE BODY IN DRIVING ENGAGEMENT WITH SAID SUPPORT RING, AT LEAST ONE CUTTER ASSEMBLY MOUNTED ON SAID SUPPORT RING, SAID ASSEMBLY INCLUDING A BASE PLATE SECURED TO THE SUPPORT RING, A CUTTER HEAD MOUNTED ON THE BASE PLATE FOR RADIAL ADJUSTMENT RELATIVE TO THE SUPPORT RING, KNIFE MEANS MOUNTED ON THE CUTTER HEAD FOR RADIAL MOVEMENT THEREON RELATIVE TO THE PIPE, FEED MEANS INCLUDING A FEED SCREW ROTATABLY MOUNTED ON THE CUTTER HEAD FOR MOVING SAID KNIFE MEANS RADIALLY. STATIONARY MEANS MOUNTED ON THE BODY COOPERATING WITH SAID FEED SCREW MEANS FOR ROTATING THE SAME IN RESPONSE TO ROTATIONS OF SAID SUPPORT MEANS RELATIVE TO SAID BODY, SAID FEED MEANS INCLUDING A THRUST SLEEVE CONNECTED TO SAID FEED SCREW FOR LONGITUDINAL MOVEMENT BY ROTATION OF THE FEED SCREW, A CAM LEVER PITOVALLY MOUNTED IN THE CUTTER HEAD BETWEEN SAID THRUST SLEEVE AND SAID KNIFE MEANS, SAID CAM LEVER HAVING A CAM SURFACE ADJACENT ONE END OPERABLE TO URGE SAID KNIFE MEANS RADIALLY OUTWARDLY OF THE CUTTER HEAD IN RESPONSE TO THRUSTING ENGAGEMENT OF SAID THRUST SLEEVE WITH THE OPPOSITE END PORTION OF THE CAM LEVER.