Construction set including headed fastener with shoulder thereon

Claim 1

In a toy construction set including at least one piece having an aperture, a simulated nail adapted to be driven into said aperture with a force fit, comprising: a hollow tubular body member having a somewhat elliptical crosssection including a major axis having a larger dimension than said aperture, whereby said body member forms an interference fit with said aperture; one end of said member being closed and the other end being open, a head structure integral with said open end and comprising a comparatively flat upper surface portion extending outwardly from said open end and an encompassing sidewall portion depending from the outer edge of said flat upper surface portion, said encompassing sidewall portion being spaced outwardly from said tubular body member; and a plurality of circumferentially spaced gusset members extending radially between said tubular body member and said encompassing sidewall portion and integral therewith and with said flat upper surface portion, said gusset members extending axially along said tubular body member a greater distance than said encompassing sidewall portion and terminating in axially facing shoulders, said shoulders being of less diameter than said encompassing sidewall portion.