Plastic nut or grommet

Claim 1

In a combination plastic fastener including nut and grommet portions for fastening in an aperture in a panel structure, the combination comprising, a fastener body including a head portion, a shank portion and means defining a bore extending therethrough, said head including panel engaging shoulder means dimensioned to preclude passage of said fastener through said aperture, said shank extending from said head portion and defined by a substantially square cross section of a dimension smaller than said head and complementary to said aperture, said shank further including a first pair of oppositely disposed walls each including angularly inwardly directed converging portions terminating in an arcuate conical wall, each such wall defining a portion of said bore, said shank including a second pair of oppositely disposed walls interconnecting said first pair, said second pair dimensioned to provide a relatively thin, imperforate, flexible web extending between the angular extremity of said walls of said first pair to define therewith a substantially triangular cavity extending from a point adjacent said head to the free end of said shank, said bore defined by an entrant opening in said head, a barrel portion of uniform diameter extending through said head and an interrupted conical portion defined by said arcuate conical wall of said first pair, and lug means carried by the outer surface of said second pair of shank walls engageable with the sides of said aperture in said panel to preclude unintended retraction of said shank through said aperture.