Structural units and method of assembling them

Claim 1

A structure comprising a plurality of elongated bodies, each in cross section at the ends thereof including a pair of spaced bars intermediately connected by a web portion, and means connecting said bodies comprising a flat elongated connecting member having spaced flat ends defining bifurcated leg portions slotted inwardly in the same plane, the sides of said slots embracing said web portions whereby said elongated bodies are united with the spaces between said bars in the same plane in adjacent connected bodies, each of said elongated bodies comprising a pair of substantially parallel spaced allochiral bars, each bar on its outer side having two substantially straight portions extending in opposite directions from said web portion and slightly angularly positioned relative to one another, said outer sides defining the upper and lower horizontal faces of said elongated bodies, the included angles between said straight portions in each bar being slightly less than 180*, and each bar on its inner side being connected to said web portion and having two substantially straight portions each extending in opposite directions from said web portion, the opposed inner sides of said bars defining acute angles therebetween, the outer edges of said opposing inner straight portions defining the vertical sides of said elongated bodies and being spaced to form trackways receiving the leg portions of said connecting member therebetween, said bodies being connected so that said trackways adjacent one another in adjacent connected bodies are in the same horizontal plane.