Screw grommet

Claim 1

A ONE PIECE PLASTIC GROMMET FOR APPLICATION TO A GENERALLY UPRIGHT APERTURED WORK PIECE COMPRISING AN ELONGATED LATERALLY EXTENDING SHANK INSERTABLE THROUGH A WORK PIECE APERTURE, AN ENLARGED HEAD PORTION INTEGRAL WITH A TRAILING END OF SAID SHANK AND INCLUDING WORK PIECE ENGAGEABLE SURFACE MEANS DISPOSED SUBSTANTIALLY IN A PLANE TRAVERSING A LONGITUDINAL AXIS OF THE SHANK, AND MEANS DEFINING A BORE EXTENDING THROUGH SAID HEAD PORTION AND INTO SAID SHANK FOR ACCOMMODATING A COMPLEMENTARY FASTENER ELEMENT SUCH AS A SCREW, SAID SHANK INCLUDING A LONGITUDINALLY EXTENDING UPPER SIDE SECTION AND LONGITUDINALLY EXTENDING LATERALLY FACING OPPOSITE SIDE SECTIONS, ALL OF WHICH SECTIONS ARE CONTINUOUS THROUGHOUT THEIR LENGTH, SAID UPPER PORTION HAVING AN UPPER SURFACE EXTENDING OBLIQUELY UPWARDLY FROM ADJACENT SAID HEAD PORTION FOR ENGAGING BEHIND AN UPPER MARGIN OF THE WORKPIECE APERTURE, SAID SHANK INCLUDING SHOULDER MEANS INTEGRAL WITH SAID LATERALLY FACING SIDE SECTIONS SUBSTANTIALLY BELOW SAID UPPER SURFACE FOR ENGAGING BEHIND A WORK PIECE AND COMBINING WITH SAID UPPER SURFACE IN OBTAINING THREE SPACED AREAS OF CONTACT WITH SAID WORKPIECE FOR RESISTING WITHDRAWAL OF THE SHANK FROM THE WORK PIECE, AND SAID SHANK INCLUDING LONGITUDINALLY EXTENDING SLOT MEANS ONLY IN A LONGITUDINALLY EXTENDING BOTTOM SIDE SECTION THEREOF AND INTERSECTING SAID BORE FOR FACILITATING COLLAPSING OF THE SHANK DURING INSERTION THEREOF INTO A WORK PIECE APERTURE AND ALSO FOR FACILITATING SUBSEQUENT EXPANSION OF THE SHANK WHEN THE COMPLEMENTARY FASTENER ELEMENT IS INSERTED INTO SAID BORE MEANS, SAID SLOT MEANS PROVIDING THE SOLE INTERRUPTION ENTIRELY THROUGH ANY OF SAID SIDE SECTIONS.