Barbed shank fastener

Claim 1

A fastener assembly comprising: a first fastener having a head engageable with a fastening surface and a shank with a threaded portion on said shank at an end opposite said head, and an unthreaded portion of said shank, between said head and said threaded portion, having a generally cylindrical outer peripheral surface; a mating second fastener; a plurality of spaced-apart axial rows of projecting barbs spaced radially on said peripheral surface of said unthreaded portion of said shank, each of said barbs having a ramp surface thereon facing away from said head, said barbs being disposed on said shank with portions of said peripheral surface of said unthreaded portion of said shank intervening between adjacent axial rows of barbs; a domed-shaped encapsulating plastic seal completely covering said head of said first fastener; said seal extending under and covering the bottom surface of said head; the underside of said seal having two sealing areas, an outer lip and an inner lip each of said lips angularly extending away from a planar surface of said seal; said outer lip being formed to extend radially outwardly when said fastener assembly is secured in place; and said inner lip being formed to extend radially inwardly when said fastener assembly is secured in place; said planar surface extending uninterrupted between said outer lip and said liner lip to form a single annular space between said inner and outer lips bounded by said planar surface and said fastening surface; whereby said first and second fastener members are applied to components to be secured together from opposite sides thereof.