Drill bit with improved core destroying means

Claim 1

IN A DRILL BIT COMPRISING A HOLLOW BODY HAVING A CONNECTION FOR A DRILL STEM AT ITS UPPER END AND A CUTTER CARRYING LEG EXTENDING DOWNWARDLY FROM A PREDETERMINED POSITION ON ITS CIRCUMFERENCE, A DOWNWARDLY AND INWARDLY EXTENDING CUTTER BEARING ON SAID LEG ADJACENT ITS LOWER END, AND A GENERALLY FRUSTO-CONICAL CUTTER, WITH CUTTER TEETH ON ITS OUTER CONICAL SURFACE, JOURNALED ON SAID BEARING AND DISPOSED WITH ITS LARGER END RADIALLY OUTERMOST FROM THE BIT AXIS, THE IMPROVEMENT WHICH COMPRISES SAID CUTTER TERMINATING AT ITS INNER EXTREMITY SHORT OF THE BIT AXIS AND CUTTING TEETH ON SAID EXTREMITY DIRECTED AXIALLY OF THE CUTTER WITH CUTTING EXTREMITIES SEPARATED FROM EACH OTHER BY RELIEF AREAS, THE CUTTING EXTREMITIES HAVING AN AGGREGATE AREA EXPOSED AXIALLY OF THE CUTTER LESS THAN THE AGGREGATE AREA SEPARATING THE CUTTING EXTREMITIES WHICH CUTTING EXTREMITIES IN ROTATION DEFINE A SURFACE WHOSE ELEMENTS FORM A GREATER ANGLE WITH THE CUTTER AXIS THAN THE CUTTER AXIS DOES WITH THE