Self-locking threaded insert

Claim 1

A SELF-LOCKING FASTENING SLEEVE FOR INSTALLATION IN A THREADED BORE IN A BODY TO ANCHOR A THREADED FASTENING MEMBER TO THE BODY, COMPRISING: A HOLLOW CYLINDRICAL MEMBER HAVING AN EXTERNAL SCREW THREAD TO SCREW INTO SAID BORE AND AN INTERNAL SCREW THREAD FOR ENGAGEMENT BY SAID FASTENING MEMBER, SAID CYLINDRICAL MEMBER HAVING AN APERTURE IN ITS CYLINDRICAL WALL SPACED FROM ITS OPPOSITE ENDS AND CUTTING THE TURNS OF SAID EXTERNAL AND INTERNAL SCREW THREADS; AND A DEFORMABLE RESILIENT PLASTIC INSERT OF A THICKNESS GREATER THAN THE THICKNESS OF THE WALL OF SAID HOLLOW CYLINDRICAL MEMBER, SAID WALL BEING DEFINED BY THE ROOT DIAMETER OF SAID INTERNAL AND EXTERNAL SCREW THREADS, SAID PLASTIC INSERT BEING MOUNTED IN SAID APERTURE WITH ITS RADIAL OUTWARD PORTION EXTENDING INTO THE RADIAL REGION OF SAID EXTERNAL SCREW THREAD FOR FRICTIONALLY RESISTING ROTATION OF THE CYLINDRICAL MEMBER IN THE BORE, THE RADIALLY INWARD PORTION OF THE INSERT EXTENDING INTO THE RADIAL REGION OF SAID INTERNAL SCREW THREAD FOR FRICTIONALLY RESISTING ROTATION OF SAID FASTENING MEMBER RELATIVE TO THE CYLINDRICAL MEMBER, BOTH OF SAID OUTWARD AND INNER PORTIONS OF THE INSERT BEING ENLARGED IN CROSS SECTIONAL AREA RELATIVE TO THE CROSS SECTIONAL AREA OF SAID APERTURE TO INTERLOCK THE INSERT WITH THE APERTURE PRIOR TO INSTALLING SAID SLEEVE IN SAID THREADED BORE, SAID OUTWARD PORTION OF THE INSERT PROTRUDING LATERALLY OF THE INSERT INTO INTERLOCKING ENGAGEMENT WITH THE CUT TURNS OF SAID EXTERNAL SCREW THREAD FOR COMPRESSION BETWEEN THE CYLINDRICAL MEMBER AND THE WALL OF SAID BORE.