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Lock bottom carton
| Details |
Inventors: Rosenbaum, II, Walter J.;
Assignee: Inland Container Corporation (Indianapolis, IN)
Primary Examiner: Moorhead; Davis T.
Assistant Examiner:
Attorney, Agent or Firm: Fitch, Even, Tabin & Luedeka
A carton includes bottom flaps that, upon erection of the carton, fold inwardly and interlock to form a strong lock bottom carton ready for immediate loading without the aid of fastening means. The structure allows the carton to be used as a retripper whereby the bottom flaps are folded inwardly as the carton is collapsed to a flat, shipping state with the relation between the interlocked flaps being such as to allow ready return of the lock bottom condition upon re-erection of the carton. |
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DETAILED DESCRIPTION What is claimed is: 1.
A lock bottom carton having a perimeter of four connected walls having hinged top flaps and hinged bottom flaps folded and interlocked to form a closed, generally flat bottom, the improvement comprising: a first bottom flap folded generally in the plane of the bottom and hingedly connected to one pair of adjacent walls and a second bottom flap folded generally in the plane of the bottom and hingedly connected to the other pair of adjacent walls, each said bottom flap comprising a folded portion and an unfolded portion, the unfolded portion being hingedly connected to one of the walls of the pair of adjacent walls to which its bottom flap is connected and the folded portion being hingedly connected to the other of the walls, a division between the folded and unfolded portions occurring along a score that extends transversely of the bottom flap and intersects the corner formed between the pair of walls to which the bottom flap is connected, the unfolded portion having a free tapering side edge that extends from a point along its hinge spaced from said corner and that is directed inwardly of the perimeter of the connected walls, and said folded portion having a part folded internally of the carton back on itself along a fold line that forms one side edge of the fold portion and that is directed inwardly of the perimeter from said corner, the non-folded side edge of each folded portion internally overlapping the free tapered side edge of the opposing non-folded portion, thereby forming a strong lock bottom in said carton without stitching, staples, glue or other fastening means, said bottom being pushable internally after use to collapse the carton for reshipment to another location for re-use, the lock bottom automatically reforming upon opening the carton from the collapsed state.
2.
A carton in accordance with claim 1 further including an internal slot in each said bottom flap that extends along an axis that coincides with said score line that forms the division between the folded and the unfolded portions, said slot extending from said corner to a point that is more than half, but not the entire, distance to the free edge of the flap
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