Internal pipe cutter

Claim 1

A PIPE CUTTER FOR CUTTING A PIPE FROM THE INSIDE THEREOF, COMPRISING AN ARBOR ADAPTED TO FIT INSIDE THE PIPE, EXPANDABLE GRIPPING MEANS ON SAID ARBOR, SAID GRIPPING MEANS INCLUDING THREE SETS OF FINGERS WITH A CHANNEL BAR ASSOCIATED WITH EACH SET OF FINGERS WHEREBY THE CHANNEL BAR ARE EACH CAPABLE OF BEING FORCIBLY EXTENDED RADIALLY AGAINST THE INNER SURFACE OF THE PIPE, THREADED MEANS FOR ACTUATING SAID GRIPPING MEANS AND FORCEABLY EXTENDING SAID CHANNEL, BARS RADIALLY AGAINST THE INNER SURFACE OF THE PIPE, SAID THREADED MEANS CONTAINING A SURFACE ADAPTED TO RECEIVE A WRENCH FOR EFFECTING ROTATION THEREOF TO OPERATE SAID GRIPPING MEANS, A SLEEVE MEMBER FITTING OVER THE THREADED MEANS TO SHIELD IT FROM PIPE CUTTINGS, A DRIVE SHAFT JOURNALED FOR ROTATION THROUGH SAID ARBOR, A CUTTER HEAD ASSEMBLY MOUNTED ON ONE END OF SAID DRIVE SHAFT, A CUTTER BLADE MOUNTED FOR AXIAL MOVEMENT IN SAID CUTTER HEAD ASSEMBLY, MEANS FOR MOVING THE CUTTER BLADE ON ROTATION OF THE DRIVE SHAFT, AND MEANS ON SAID SHAFT FOR MOUNTING A DRIVE MECHANISM WITH THE ARBOR LOCATED BETWEEN THE CUTTER HEAD ASSEMBLY AND THE DRIVE MECHANISM.