Self-tapping insert with chip breaker

Claim 1

A SELF-TAPPING INSERT FOR INSTALLATION IN AN OPENING FORMED IN A MATERIAL RELATIVELY SOFTER THAN THE MATERIAL OF SAID INSERT, SAID INSERT COMPRISING AN ELONGATED BODY MEMBER HAVING A CENTRAL THREADED BORE THERETHROUGH EXTENDING LONGITUDINALLY THEREOF AND HAVING A THREADED EXTERIOR SURFACE WITH TAPPING THREADS FORMED AT ONE END THEREOF, SAID TAPPING THREADS HAVING A SUBSTANTIALLY FLAT CREST PORTION WITH THE HEIGHT OF THE THREADS GRADUALLY DIMINISING TOWARD SAID ONE END, SAID BODY MEMBER HAVING A CIRCULAR CHIP RELIEF APERTURE EXTENDING INWADLY FROM THE TAPPING PORTION OF THE THREADED EXTERIOR SURFACE TO COMMUNICATE WITH THE THREADED BORE, THE SEVERED ENDS OF THE THREADS AT THE OUTER PERIPHERY OF SAID APERTURE DEFINING CUTTING EDGES TO CUT A TAP CHIP AS THE INSERT IS BEING POSITIONED IN THE OPENING OF THE MATERIAL, AND AN OBSTRUCTION IN THE PATH OF MOVEMENT OF THE CHIP THROUGH AN APERTURE TO CAUSE SUCH CHIPS TO BREAK INTO RELATIVELY SMALL PIECES, SAID OBSTRUCTION COMPRISING A SUBSTANTIALLY RIGHT-ANGLE, ANNULAR SHOULDER DEFINED BY A REDUCTION IN THE WIDTH OF SAID RELIEF APERTURE AND POSITIONED RADIALLY INWARDLY OF SAID CUTTING EDGES, WHEREBY UNSEVERED CHIPS ARE PREVENTED FROM ENTERING AND BLOCKING SAID INTERNAL THREADS.