Patent ID: 7722138

Claim:
A file cabinet having a cabinet housing comprising: a multi-sided housing unit comprising a back wall disposed between side walls in a U-shape which said back wall and said side walls are defined by a single continuous sheet of a rigid sheet material so as to be joined one with the other along corners thereof in a rear portion of said housing unit, said side walls being disposed in laterally spaced but opposing relation and have rear edge sections joined laterally together by said back wall wherein respective top and bottom edges of said back wall and said side walls define open top and bottom sides of said housing unit, said side walls further including front edge sections in a front portion of said housing unit which are laterally spaced apart to define an open front side of said cabinet housing which opens into a hollow interior of said cabinet housing wherein rigid horizontal support structure rigidly maintains said front edge sections in spaced relation, said housing unit further including a top wall which is positioned onto said top edges of said back wall and said side walls to enclose said open top side of said housing unit; and a reinforcement box comprising a planar back panel having a shape which corresponds to said back wall and interconnected edge panels, which said back wall and said edge panels are interconnected together so as to be movable together as a single integral unit that is positionable in said housing unit for reinforcing the rear portion of said housing unit, said edge panels extending about the periphery of said back panel and projecting forwardly therefrom to define front panel edges wherein said edge panels, including said front panel edges, are contained in the rear portion of said hollow interior, said edge panels being rigidly joined in end-to-end relation at corners defined therebetween and joined rigidly with said back panel about said periphery to define an open-sided box shape, said reinforcement box being positioned within said hollow interior and having an opposite pair of said edge panels which each extend vertically and are disposed in opposing contacting relation with an interior surface of a respective one of said side walls, said edge panels being immovably fastened directly to rear portions of said side walls along a vertical length thereof to fixedly and rigidly secure said side walls to said vertical edge panels of said reinforcement box and non-movably fix said rear portions of said side walls sidewardly relative to each other by said reinforcement box, said immovable fastening preventing displacement of said reinforcement box forwardly and rearwardly relative to said side walls and preventing said side walls from moving laterally outwardly away from said edge panels of said reinforcement box.