Patent ID: 6959520

Claim:
A structural beam elongated in a first direction and transverse to said direction of elongation comprising; two flanges joined by a web, said web being substantially perpendicular to said flanges and joining said flanges roughly at a central point, and at least two angle sections, each said angle section connected to said web near one of said flanges and forming an acute angle with the portion of said web closest to said near flange, said near flange and each of said at least two angle sections forming a roughly dovetail shaped channel with an aperture opening into an interior cavity, said dovetail shaped channel having a seal surface on one side, a lock surface roughly opposed to said seal surface on the other side and having a bottom section facing said aperture and connecting said seal surface with said lock surface; whereby, a number of larger structures with integral connection to said structural beams with a variety of energy saving features can be constructed.