Retainer fastener

Claim 1

A ONE-PIECE SELF-RETAINING SHEET METAL NUT FASTENER MADE FROM MATERIAL OF SUBSTANTIALLY UNIFORM THICKNESS WHICH IS ADAPTED TO BE TELESCOPICALLY ASSEMBLED WITHIN A COMPLEMENTARY BORE IN A WORKPIECE, SAID FASTENER FORMED FROM A DOUBLE CRUCIFORM BLANK AND INCLUDING A PLANAR HEAD MEMBER HAVING A CENTRALLY LOCATED APERTURE, A DEPENDING OPEN ENDED TUBULAR BODY MEMBERS SURROUNDING SAID APERTURE WHICH IS INTEGRAL WITH SAID HEAD AND DRAWN FROM THE BLANK FORMING SAID HEAD, SAID BODY MEMBER PROVIDED WITH INTERNAL THREAD ENGAGING MEANS SUITABLE FOR ACCEPTING A COMPLEMENTARY SCREW THREADED MEMBER TO BE PASSED THERETHROUGH, TWO PAIRS OF OPPOSED TABS ARRANGED IN QUADRATURE WHICH ARE INTEGRAL WITH SAID HEAD AND EMANATING THEREFROM IN A RADIAL AND CO-PLANAR FASHION AND PROVIDING SHOULDERS ON SAID HEAD WHICH DETERMINE THE DEPTH TO WHICH SAID FASTENER MAY BE INSERTED INTO THE COMPLEMENTARY BORE IN A WORKPIECE, TWO PAIRS OF OPPOSED ELONGATED FINGERS ARRANGED IN QUADRATURE WHICH HAVE A BENDABLE JUNCTION INTEGRAL WITH THE PERIPHERAL MARGIN OF SAID HEAD AND POSITIONED INTERMEDIATE ADJACENT PAIRS OF THE AFOREMENTIONED TABS, EACH SAID BENDABLE JUNCTION BEING AN EQUAL RADIAL DISTANCE FROM THE BODY AXIS, ONE PAIR OF FINGERS BEING OF GREATER RADIAL LENGTH IN THE BLANK THAN THE OTHER PAIR OF FINGERS, SAID FIRST PAIR OF FINGERS BEING INITIALLY FORMED DOWNWARDLY AND INWARDLY FROM THEIR BENDABLE JUNCTURE WITH SAID HEAD MEMBER AND AXIALLY BEYOND SAID THREADED BODY MEMBER THENCE BEING BENT INWARDLY AGAIN UNDER SAID THREADED BODY MEMBER UNTIL SAID FIRST PAIR OF FINGERS ARE IN CLOSE AND OPPOSED PROXIMITY TO EACH OTHER AT WHICH POINT EACH FINGER IS REVERSELY BENT OUTWARDLY TO PROVIDE TERMINAL FINGER PORTIONS EXTENDING SUBSTANTIALLY ALONG A PLANE NORMAL TO THE AXIS OF THE FASTENER, SAID SECOND PAIR OF FINGERS BEING BENT DOWNWARDLY AND INWARDLY FROM THEIR BENDABLE JUNCTURE WITH SAID HEAD MEMBER TOWARDS THE FREE END OF SAID BODY MEMBER AND EXTENDED UNTIL THEY SUBSTANTIALLY ABUT THE MARGINAL EDGES OF SAID FIRST PAIR OF FINGERS THENCE BENT OUTWARDLY TO PROVIDE TERMINAL FINGER PORTIONS EXTENDING SUBSTANTIALLY ALONG THE SAME PLANE AS THE SAID FIRST PAIR OF FINGERS, ALL OF SAID FINGERS TERMINATING IN A POINT WITH ALL POINTS FALLING ON AN IMAGINARY CIRCLE CONCENTRIC WITH AND OF GREATER DIAMETER THAN SAID THREADED BODY MEMBER, AND EACH POINT OF EACH OF SAID FINGERS EXTENDED RADIALLY OUTWARD A RADIAL DISTANCE SUBSTANTIALLY EQUAL TO THE RADIAL DISTANCE THAT THE BENDABLE JUNCTURE OF EACH OF SAID FINGERS EXTENDS FROM THE AXIS OF THE FASTENER SHANK PORTION, SAID TERMINAL FINGER PORTIONS OF SAID FIRST FINGERS HAVING A GREATER RADIAL LENGTH THAN SAID TERMINAL FINGER PORTIONS OF SAID SECOND FINGERS, SAID FASTENER SHANK PORTION ADAPTED TO EXTEND INTO SAID BORE TO A DEPTH AS DETERMINED BY SAID TABS, SAID FINGER PORTIONS IN THE VICINITY OF THE JUNCTURE OF THOSE PORTIONS IN THE COMMON PLANE AND THEIR ADJACENT REVERSELY BENT PORTIONS BEING SPACED APART A DISTANCE SUBSTANTIALLY SMALLER THAN THE DIAMETER OF THE THREADED BODY MEMBER AND THE COMPLEMENTARY SCREW MEMBER WITH WHICH ITS COOPERATES TO ASSURE THAT AS THE COMPLEMENTARY SCREW IS INSERTED AND MOVED AXIALLY THROUGH SAID FASTENER SHANK PORTION THAT SAID FINGERS ARE FORCED LATERALLY INTO THE MATERIAL OF THE WORKPIECE FORMING THE WALL OF SAID BORE WITH THE POINTS ON THE TERMINAL PORTIONS OF SAID TWO PAIRS OF SAID FINGERS ASSUMING AN IMBEDDED POSITION IN TWO DIFFERENT PLANES WHICH ARE NORMAL TO THE AXIS OF THE FASTENER AND WHICH OCCURS BECAUSE OF THE DIFFERENT LENGTHS OF THE TERMINAL PORTIONS OF EACH OF SAID TWO PAIRS OF SAID FINGERS BEING MOVED RADIALLY OUTWARDLY DIFFERENT RADIAL MEASUREMENTS FROM THEIR INITIAL POSITION IN A COMMON PLANE NORMAL TO THE FASTENER AXIS.