Reamer for jet piercer

Claim 1

A JET PIERCER COMPRISING A BURNER HAVING A LONGITUDINAL AXIS OF ROTATION AND MOUNTABLE WITH SAID AXIS IN A VERTICAL ORIENTATION SO THAT FLUID FUEL AND FLUID OXIDANT ARE DELIVERED TO ITS UPPER END AND THE PRODUCTS OF COMBUSTION ARE DELIVERED THROUGH ITS LOWER END, TOGETHER WITH A ROLLING CUTTER REAMER DISPOSED AROUND THE OUTER SURFACE OF SAID BURNER AND HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED ROLLING CUTTERS MOUNTED THEREON AND ADAPTED TO CUT AN ANNULAR PORTION OF A BOREHOLE LYING OUTSIDE OF THE BOTTOM AREA DIRECTLY BELOW SAID BURNER AND ADJACENT THE SIDEWALL OF SAID BOREHOLE AND ALOS TO MAINTAIN THE GAGE OF SAID SIDEWALL, THE CUTTING STRUCTURE OF SAID CUTTERS BEING OF THE TYPE WHEREIN COMPACTED INSERTS OF CEMENTED WEAR RESISTANT MATERIAL ARE SECURED IN HOLES DRILLED IN THE OUTER SURFACES OF THE CUTTERS AND INCLUDING AT LEAST A ROW DISPOSED TO ROTATE THROUGH A LOWERMOST POSITION IN WHICH THEY ARE DISPOSED AT AN ACUTE ANGLE WITH RESPECT TO SAID SIDEWALL WHILE SIMULTANEOUSLY CONTACTING BOTH SIDEWALL AND BOTTOM OF THE HOLE, SAID BURNER HAVING A NUMBER OF CIRCUMFERENTIALLY SPACED FLAME PORTS IN ITS LOWER END AND A RADIALLY OUTWARDLY EXTENDING DOWNWARDLY FACING SHOULDER ON ITS OUTER PERIPHERY, SAID REAMER HAVING A CORRESPONDING RADIALLY OUTWARDLY EXTENDING, UPWARDLY FACING SHOUDLER ON ITS INNER PERIPHERY TO ENGAGE SAID BURNER SHOULDER AND SUPPORT THE BURNER AGAINST DOWNWARD AXIAL MOVEMENT, SAID INNER PERIPHERY OF THE REAMER AND OUTER PERIPHERY OF THE BURNER BEING PROVIDED WITH SPLINES ON ONE OF THEM AND CORRESPONDING GROOVES ON THE OTHER RECEIVING SAID SPLINES TO PREVENT RELATIVE ROTATION BETWEEN NURNER AND REAMER, SAID SPLINES AND GROOVES BEING DISPOSED TO ORIENT EACH SAID FRAME PORT BETWEEN ADJACENT ROLLING CUTTERS, SAID REAMER HAVING AN UPWARDLY EXTENDING SHANK ADAPTED TO FORM A SECURE CONNECTION TO A SUB AND SAID REAMER HAVING AN UPWARDLY EXTENDING PORTION ADAPTED TO SLIDABLE AND SEALINGLY ENGAGE A HEADER MEANS DEPENDING FROM SAID SUB INSIDE SAID REAMER SHANK TO SUPPLY SAID FUEL AND OXIDANT.