Inside pipe cutting tool

Claim 1

A CUTTER MEMBER ADAPTED TO BE USED IN AN INSIDE PIPE CUTTER HAVING A MANDREL, CUTTER MEMBERS CARRIED ON SAID MANDREL AND EXTENDING PARTIALLY CIRCUMFERENTIALLY THEREOF AND DISPOSED FOR MOVEMENT IN A PLANE SUBSTANTIALLY PERPENDICULAR TO THE AXIS OF SAID MANDREL, PIVOT MEANS EXTENDING SUBSTANTIALLY PARALLEL TO THE AXIS OF THE MANDREL FOR PIVOTALLY CONNECTING SID CUTTER MEANS TO SAID MANDREL, EXPANDER MEANS FOR PIVOTING SAID CUTTER MEMBERS LATERALLY OUTWARDLY RELATIVE TO SAID MANDREL INTO ENGAGEMENT WITH THE INNER PERIPHERY OF THE PIPE FOR CUTTING THE PIPE UPON AXIAL ROTATION OF SAID MANDREL, AND MEANS FOR POSITIONING SAID CUTTER MEMBERS AT THE DESIRED ELEVATION IN THE PIPE, COMPRISING: (A) AN ELONGATE BODY HAVING AN ARCUATE CONVEX EXTERNAL SURFACE AND HAVING A PIVOT OPENING AT ONE END THEREOF, (B) SAID BODY HAVING LONGITUDINALLY EXTENDING UPPER AND LOWER EDGES ON SAID CONVEX SURFACE, (C) A PLURALITY OF CUTTER ELEMENTS SECURED INA PLURALITY OF DIAGONALLY SPACED ROWS ON SAID ARCUATE CONVEX SURFACE, (D) SAID ROWS EXTENDING BETWEEN SAID UPPER AND LOWER EDGES AND AT AN ANGLE RELATIVE TO THE LONGITUDINAL AXIS OF SAID BODY, (E) SAID CUTTER ELEMENTS PROJECTING LATERALLY OUTWARDLY FROM SAID ARCUATE CONVEX SURFACE FOR CUTTING ENGAGEMENT WITH THE INSIDE OF A PIPE, AND (F) SAID CUTTER ELEMENTS IN EACH ROW BEING DISPOSED SUBSTANTIALLY ADJACENT TO EACH OTHER TO DEFINE CHANNELS BETWEEN EACH ROW FOR THE FLOW OF DRILLING MUD OR CUTTINGS CUT BY THE CUTTER ELEMENTS.