Threaded insert

Claim 1

A THREADED INSERT ADAPTED TO BE PERMANENTLY INSTALLED IN A MEMBER OF YIELDABLE MATERIAL HAVING A CYLINDRICAL OPENING WHICH HAS AN INNER END AGAINST WHICH SAID INSERT CAN ABUT, SAID INSERT COMPRISING INNER AND OUTER GENERALLY CYLINDRICAL PORTIONS THE DIAMETER OF WHICH PERMIT THE INSERT TO BE SLIDABLY RECEIVED IN SAID OPENING, SAID OUTER PORTION DEFINING A THREADED SEGMENT AND HAVING A SEGMENT WHICH HAS A PLURALITY OF RADIALLY PROTRUDING CIRCUMAXIALLY SPACED TEETH EACH OF WHICH TEETH EXTENDS GENERALLY PARALLEL TO THE AXIS OF SAID INSERT TO PERMIT THE SAME TO BE PRESSED TO ITS OPENING AND TO HELD PREVENT TURNING MOVEMENT THEREOF RELATIVE TO SAID MEMBER, A CIRCUMFERENTIALLY CONTINUOUS ANNULAR PORTION OF SAID INSERT BETWEEN SAID INNER AND OUTER PORTIONS AND HAVING AN EXTERNAL DIAMETER SUBSTANTIALLY EQUAL TO THAT OF SAID OUTER PORTION, SAID ANNULAR PORTION HAVING A PLURALITY OF RADIALLY PROTRUDING CIRCUMAXIALLY SPACED TEETH EACH OF WHICH IS AXIALLY ALIGNED WITH A TOOTH IN SAID OUTER PORTION, INNER AND OUTER ANNULAR WALL CIRCUMFERENTIALLY CONTINUOUS PORTIONS OF FRUSTO-CONICAL SHAPE INTEGRALLY CONNECTED AT THEIR LARGER ENDS OF SAID ANNULAR PORTION AND AT THEIR SMALLER ENDS TO SAID INNER AND OUTER PORTIONS RESPECTIVELY, EACH OF SAID CONICALLY SHAPED WALL PORTIONS HAVING A THICKNESS WHICH PERMITS SAID WALL PORTIONS TO BE COLLAPSED AXIALLY UNDER A PREDETERMINED COMPRESSIVE STRESS WHEREBY SAID ANNULAR PORTION CAN BE URGED RADIALLY OUTWARDLY INTO ENGAGEMENT WITH SAID MEMBER.