Geometric amusement set

Claim 1

A geometric building and amusement set comprising a plurality of generally equilateral triangularly cross sectioned pieces having substantially flat parallel upper and lower surfaces joined by side surfaces disposed substantially perpendicular to the upper and lower surfaces, the set having three distinctly shaped groups of pieces which can be assembled to form three dimensional geometric figures; a. a first group of pieces having formed on a first side surface a generally rectangular male connector protruding outwardly therefrom and forming a major widthwise extent of said first side surface and having pivotal joining means formed on opposite ends of the male connector, a generally rectangular female connector recess formed in a second side surface and proportioned to accept a male connector of an adjacent piece and having cooperating pivotal joining means releasably engageable with the corresponding joining means formed on a male connector of an adjacent piece, said joining means comprising a protuberance formed in each end portion of the female connector recess and a corresponding recess formed in each end of the male connector, the protuberances and corresponding recesses forming the pivotal axis of adjacent connected pieces and so formed as to permit at least 180° of relative rotation, and a third continuously flat side surface free of functional discontinuities therein and of any means for interconnecting with other pieces; b. a second group of pieces formed with only said male connector on one side surface and the remaining side surfaces being continuously flat and free of functional discontinuities therein and of any means for interconnecting with other pieces; and c. a third group of pieces formed with only the female connector recess on one side surface and the remaining side surfaces being continuously flat and free of functional discontinuities therein and of any means for interconnecting with other pieces.