Deformable head screw grommet

Claim 1

A FASTENER STRUCTURE FOR CONNECTING A FIRST WORKPIECE HAVING A FIRST APERTURE OF PREDETERMINED TRANSVERSE DIMENSIONS THERETHROUGH AND A SECOND WORKPIECE HAVING A SECOND APERTURE THERETHROUGH, SAID FASTENER STRUCTURE COMPRISING A SCREW HAVING A THREADED SHANK INSERTABLE THROUGH SAID APERTURES AND HAVING A DIAMETER SUBSTANTIALLY LESS THAN SAID TRANSVERSE DIMENSIONS OF SAID FIRST MENTIONED APERTURE FOR ACCOMMODATING PARTIAL MISALIGNMENT OF SAID APERTURES, AND A ONE-PIECE RESILIENTLY DEFORMABLE PLASTIC FASTENER MEMBER INCLUDING AN APERTURED GENERALLY RADIALLY EXTENDING PORTION SNUGLY RECEIVING THE THREADED SHANK OF SAID THREADED SCREW, SAID APERTURED PORTION HAVING TRANSVERSE DIMENSIONS GREATER THAN TRANSVERSE DIMENSIONS OF SAID FIRST MENTIONED WORKPIECE APERTURE AND BEING DISPOSED FOR COMPLETELY TRAVERSING SAID FIRST MENTIONED WORKPIECE APERTURE WHEN THE FASTENER STRUCTURE IS ASSEMBLED WITH THE WORKPIECES, A SHANK PORTION EXTENDING AXIALLY FROM SAID RADIALLY EXTENDING PORTION FOR ENTRY INTO SAID APERTURE IN SAID SECOND WORKPIECE, SAID RADIALLY EXTENDING PORTION BEING ENGAGEABLE WITH ONE SIDE OF SAID SECOND WORKPIECE, AND SHOULDER MEANS ON SAID SHANK PORTION OF SAID PLASTIC FASTENER MEMBER ENGAGEABLE WITH AN OPPOSITE SIDE OF SAID SECOND WORKPIECE FOR CONNECTING SAID PLASTIC FASTENER MEMBER WITH SAID SECOND WORKPIECE, SAID APERTURE IN SAID RADIALLY EXTENDING PORTION OF THE PLASTIC MEMBER EXTENDING INTO SAID SHANK PORTION OF THE PLASTIC MEMBER AND INITIALLY HAVING A DIAMETER LESS THAN SAID DIAMETER OF THE SCREW SHANK FOR ENABLING INTERENGAGEMENT BETWEEN THE SCREW SHANK AND THE PLASTIC MEMBER, AND A PLURALITY OF NARROW RESILIENTLY AND AXIALLY DEFORMABLE PLASTIC FINS INTEGRAL WITH AND PROJECTING AXIALLY FROM SAID APERTURED PORTION ON THE SIDE OPPOSITE SAID SHANK PORTION AND DISTRIBUTED OVER AN AXIALLY FACING END OF SAID APERTURED PORTION, AT LEAST SOME OF SAID FINS PROJECTING PARTIALLY WITHIN SAID FIRST MENTIONED WORKPIECE APERTURE AND PARTIALLY AGAINST A SURFACE OF SAID FIRST MENTIONED WORKPIECE SURROUNDING THE APERTURE AND FOR BEING FORMED AROUND AN EDGE OF SAID FIRST MENTIONED WORKPIECE APERTURE FOR RESISTING LATERAL DISPLACEMENT OF SAID FIRST MENTIONED WORKPIECE RELATIVE TO THE FASTENER STRUCTURE WHEN THE FASTENER STRUCTURE IS FULLY APPLIED TO SAID WORKPIECE.