Threaded elements with self-tapping peaks and recesses

Claim 1

AN ELEMENT COMPRISING A BODY HAVING EXTERNAL THREADS ABOUT AN AXIS TO BE SCREWED INTO A CARRIER MEMBER; SAID THREADS HAVING MODIFIED MINOR DIAMETER SURFACES WHICH ARE SUBSTANTIALLY WIDER AXIALLY THAN THE NARROWEST PORTIONS OF THE CRESTS OF SAID THREADS; SAID BODY HAVING A SECOND SET OF THREADS DIFFERENT FROM SAID EXTERNAL THREADS FOR ENGAGING A MATING PART TO ATTACH IT TO SAID CARRIER MEMBER; SAID EXTERNAL THREADS HAVING RADIALLY OUTER SURFACES OF NON-CIRCULAR CROSS-SECTION DEFINING RADIALLY OUTWARDLY PROJECTING CIRCULARLY SPACED PEAKS, AND WHICH, IN ADVANCING CIRCULARLY BETWEEN PEAKS, ADVANCE FIRST PROGRESSIVELY RADIALLY INEARDLY AND THEN OUTWARDLY RELATIVE TO SAID AXIS AND SAID MODIFIED MINOR DIAMETER SURFACES, AND THEREBY PROGRESSIVELY TRUNCATE THE EXTERNAL THREADS TO FIRST PROGRESSIVELY DECREASE AND THEN INCREASE IN RADIAL THICKNESS; SAID OUTER SURFACES HAVING MINIMUM RADIUS PORTIONS CIRCULARLY BETWEEN SAID PEAKS AT WHICH SAID SURFACES ARE NEAREST TO SAID AXIS AND WHICH ARE RECESSED RADIALLY INWARDLY A SUBSTANTIAL DISTANCE BEYOND PLANES DRAWN TO JUST TOUCH ADJACENT PEAKS; SAID BODY HAVING AT LEAST ONE END WHICH MAY BE ITS LEADING END UPON INSTALLATION AND WHICH HAS A TAPERING CHAMFER SURFACE OF CIRCULAR CROSS SECTION CENTERED ABOUT SAID AXIS AND PROGRESSIVELY TRUNCATING SAID PEAKED THREADS TOWARD SAID ENF OF THE BODY; SAID EXTERNAL THREADS HAVING OPPOSITE SIDE FACES DEFINING A THREAD PROFILE WHICH REMAINS THE SAME FROM ONE MINIMUM RADIUS PORTION TO THE NEXT EXCEPT INSOFAR AS THE THREADS ARE TRUNCATED; SAID OUTER SURFACES, AS THEY ADVANCE RADIALLY INWARDLY, INCREASING IN WIDTH AXIALLY BETWEEN SAID OPPOSITE SIDE FACES; SAID OUTER SURFACES, AS THEY COMMENCE THEIR INWARD ADVANCEMENT FROM THE OUTERMOST PORTIONS OF SAID PEAKS, AT SIDES OF THE PEAKS WHICH MAY BE THE CIRCULARLY LEADING SIDES WHEN SAID ELEMENT IS SCREWED INTO SAID CARRIER MEMBER, BEING SHAPED TO INITIALLY ADVANCE PRIMARILY IN A CIRCULARLY ADVANCING DIRECTION AND AT A MUCH SLOWER RATE RADIALLY INWARDLY; AND SAID OUTER SURFACES CHANGING PROGRESSIVELY IN RADIAL DISTANCE FROM SAID AXIS THROUGH TH MAJOR PORTION OF THE CIRCULAR DISTANCE BETWEEN TWO SUCCESSIVE MINIMUM RADIUS PORTIONS.