Patent ID: 7343864

Claim:
A modular shelving unit comprising a pair of vertical side panels interconnected together by horizontal cross-bars to maintain said side panels in vertical parallel relationship to one another, said side panels having a pair of symmetrical side walls, immovably secured back-to-back in spaced-apart parallel relationship by integrally formed securement flanges projecting from opposed side edges of said sidewalls; said securement flanges of each said panels when placed back-to-back, being welded together to immovably secure said side panels; each side wall having a pair of outwardly projecting elongated formations formed in a front and rear portion of said side wall, said side wall having a recessed intermediate section between said pair of outwardly projecting elongated formations and a plurality of horizontally aligned connecting slots in said pair of projecting elongated formations, said slots in said front and rear portion of said side wall being aligned with one another, at least some slots in said projecting elongated formations of said front portion of said side walls having opposed cavities formed in a top and bottom edge of said at least some of said slots adjacent an end thereof to form an enlarged slot section for receiving an extension pin projecting from an end edge of a shelf in a forward portion thereof with said extension pin supported below said bottom edge of said slot having said enlarged slot section thereby supporting said shelf at an angle between said vertical side panels, said cavities formed in said top and bottom edge of said at least some of said slots permitting one of said side walls of said side panel to be inverted whereby said cavities or interconnected side walls are disposed in aligned relationship while permitting said extension pin to lie below said bottom edge of said slot.