Unitary knockdown file box

Claim 1

A storage box used for a file container or the like comprising: a single piece, corrugated cardboard blank that is foldable into a completed configuration that has openable and closable top without requiring strings, latches, latch buttons and the like; said blank including two outer side walls, each side wall having hingedly connected at respective ends via foldable creases respective fold-over end portions that have respective interlocking tabs for allowing said end portions to be folded into position and locked with said tabs to facilitate additional folding into a finished box, said end portions having corrugations traversing longitudinally upwardly from said bottom in the finished box position; bottom hingedly connected with said two sides at their bottoms with a foldable crease; two respective box ends having respective inner and outer portions and hingedly connected at a respective inner end of said inner portions to said bottom by a foldable crease; each said box end having adjacent its midpoint a lock aperture and a 180° foldable crease such that its inner and outer portions can fold over and encompass said respective end portions of said sides and leave said lock aperture exposed to received a lock tab for holding a top closed; said ends thereby comprising triple strength panels with vertical corrugations for high strength for stacking; said ends having longitudinally disposed corrugations such that said corrugations are vertical in the finished box and parallel with the corrugations in said end portions of said sides in said finished box for stacking strength; said ends having respective lifting means for lifting said box, each lifting means in said ends comprising mating apertures in each respective pair of said inner and outer portions of said ends and a cut out recess in said end portions of said sides, said cut out recess also providing space for receiving a lock tab of a foldable flap of a top panel; two respective oppositely disposed top panels hingedly connected respectively at one end with the respective tops of respective said side walls by a foldable crease; one of said top panels having a foldable flap adapted to fold over the free end of the oppositely disposed top panel, said foldable flap having hingedly connected at each end by a foldable crease a lock tab adapted to be lockingly inserted within said lock aperture and said cut out recess of said ends for holding said top closed and being lifted from said lock aperture for easy opening of said top panel to allow access to the interior of said storage box as infrequently desired.