Structural frame corner assembly for electrical switchboards and the like

Claim 1

A structural frame corner assembly for enclosures such as electrical switchboards and the like, said assembly comprising, in combination: A. an elongated width post, an elongated depth post and an elongated vertical post arranged in mutually perpendicular relationship with a terminal portion of said vertical post disposed in intermediate, abutting relation with terminal portions of said width and depth posts at a corner of the enclosure frame, (1) each of said posts being C-shaped in cross-section to provide a coextensive slot flanked by flanges having corresponding patterns of holes preformed therein; B. a sheet metal gusset sub-assembly including (1) a brace integrally formed having a pair of elongated legs arranged at a right angle; (2) vertically spaced patterns of preformed holes distributed along the lengths of said legs; (3) a triangular gusset plate affixed to said legs to reinforce their right angular relationship; and (4) a finger integrally formed with the free end of each said leg and bent back in directions away from said gusset plate, the lengths of said fingers being slightly in excess of the depth of said post slots; and C. self-threading screws utilizing said preformed holes in said post flanges and said brace legs to assemble said gusset sub-assembly to said width, depth and vertical posts and thus rigidly preserve their mutually perpendicular relationship, said fingers resiliently engaging said width and depth posts through said slots therein to tension said assembly.