Chair frame and associated chair framing material

A Chair frame, said chair frame comprising an upper frame portion for supporting a seat and a plurality of leg members, said chair frame being fabricated of elongated bar material of extruded aluminum, said elongated bar material having an extruded configuration defining a substantially rectangular cross-section with corners defining expanded areas of substantially solid extruded aluminum such that reenforcing ribs are provided along the length of said elongated bar material, each said reenforcing rib defining first and second opposing, substantially parallel exterior surfaces which extend at substantially 45.degree. angles from an adjoining exterior primary wall surface of said elongated bar material and define third and fourth exterior surfaces which adjoin said first and second exterior surfaces, respectively, at substantially 45.degree. angles, and which converge in a rounded exterior corner surface.