High strength threaded insert

Claim 1

A THREADED INSERT ADATPED FOR ANCHORAGE IN A BODY HAVING A SMOOTH-WALLED, APPROXIMATELY CYLINDRICAL BORE EXTENDING INWARDLY FROM THE SURFACE THEREOF, SAID INSERT COMPRISING: A PLUG COMPONENT HAVING A BORE WITH INTERNAL THREADS, FORMED IN THE WALL OF SAID BORE, THE OUTSIDE SURFACE OF THE PLUG COMPONENT COMPRISING: (A) AT THE FIRS INSERTED END A FIRST FLANGE HAVING A RELATIVELY SMOOTH CIRCUMFERENTIAL SURFACE OF SUCH DIAMETER AS TO JUST FIT WITHIN THE BORE OF THE SUPPORTING BODY; (B) A SLIGHTLY LARGER DIAMETER SECOND FLANGE ADJACENT THE FIRST FLANGE HAVING AROUND ITS CIRCUMFERENCE A PLURALITY OF HELICAL SERRATIONS ORIENTED IN A DIRECTION CORRESPONDING TO THE DIRECTION OF THE THREADS IN SAID BORE, THE HELIX ANGLE OF THE SERRATIONS IN RELATION TO THE AXIS OF THE PLUG COMPONENT BEING STEEPER THAN THE HELIX ANGLE OF THE INTERNAL THREADS OF THE PLUG COMPONENT, THE SECOND FLANGE BEING OF SUCH DIAMETER THAN THE WALLS OF THE BORE IN THE SUPPORTING BODY ARE GROOVED IN ONE DIRECTION; (C) A ROUND REARWARDLY TAPERING PORTION EXTENDING FROM THE SECON FLANGE TO THE END OF THE PLUG COMPONENT; AND A RING HAVING A TAPERING INTERNAL BORE ADAPTED TO FIT AROUND THE TAPERING PORTION OF THE PLUG COMPONENT AND HAVING ON THE OUTSIDE SURFACE A PLURALITY OF HELICAL SERRATIONS ORIENTED IN A DIRECTION SUBSTANTIALLY OPPOSITE TO THAT OF THE AFOREMENTIONED SERRATIONS, THE HELIX ANGLE OF THE SERRATIONS IN RELATION TO THE AXIS OF THE PLUG COMPONENT BEING STEEPER THAN THE HELIX ANGLE OF THE INTERNAL THREADS OF THE PLUG COMPONENT, THE OUTSIDE DIAMETER OF THE RING BEING THE SAME SIZE AS THAT OF THE SECOND FLANGE OF SAID PLUG SO THAT THE WALLS OF THE BORE IN THE SUPPORTING BODY ARE GROOVED IN A DIRECTION SUBSTANTIALLY OPPOSITE TO THAT OF THE AFOREMENTIONED GROOVES.