Self-securing fastener

Claim 1

A FASTENER ADAPTED TO COOPERATE WITH A SCREW IN SECURING AND ARTICLE TO AN APERTURED SUPPORT COMPRISING AN ENLARGED HEAD, A HOLLOW SCREW-RECEIVING SHANK EXTENDING FROM SAID HEAD, AND A PLURALITY OF RESILIENT FINS DISPOSED ABOUT THE EXTERIOR OF SAID SHANK, SAID FINS PROJECTING OUTWARDLY OF SAID SHANK TOWARDS SAID HEAD AT AN ACUTE ANGLE TO SAID SHANK, WHEREBY SAID FASTENER MAY BE SNAPPED INTO AN APERTURE SUPPORT, A SECTION OF SAID SHANK BETWEEN SAID HEAD AND SAID FINS HAVING EXTERNAL DIMENSIONS APPRECIABLY LESS THAN THE DIMENSIONS OF THE APERTURE IN THE SUPPORT, SAID SECTION BEING SUBSTANTIALLY THINNER IN CROSS SECTION THAN THE REMAINDER OF SAID SHANK, SAID SHANK HAVING AT LEAST TWO SPACED OPPOSED POSTS ADJACENT SAID HEAD, EACH OF SAID POSTS INCLUDING AT LEAST ONE ANGULAR CORNER FACING OUTWARDLY FROM SAID SHANK AND EXTENDING SUBSTANTIALLY PARALLEL TO THE AXIS THEREOF FOR ENGAGING THE CORNERS OF A POLYGONAL APERTURE IN THE SUPPORT TO PREVENT ROTATION OF SAID HEAD WITH RESPECT TO THE SUPPORT WHEN THE SCREW IS TORQUED INTO SAID SHANK, WHEREBY, RESPONSIBLE TO THE TORQUING OF A SCREW INTO SAID SHANK, A PORTION OF SAID SECTION ADJACENT SAID FINS IS TWISTED AND COLLAPSED INTO THE APERTURE IN THE SUPPORT AND SAID FINS ARE FLARED OUTWARDLY FROM SAID SHANK AND ARE DRAWN AGAINST THE SURFACE OF THE SUPPORT AT POINTS SPACED FROM THE EDGES OF THE APERTURE THEREIN.