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Glueless Automatic Bottom Carton Disclosure Number: IPCOM000079239D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 54K

Publishing Venue


Related People

Dunning, ND: AUTHOR [+4]


A box which is cheaper to make and simplifies the necessary equipment to manufacture the box is shown.

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Glueless Automatic Bottom Carton

A box which is cheaper to make and simplifies the necessary equipment to manufacture the box is shown.

The container is a single, die-cut sheet of fiberboard where two opposing tab members 12, 14 are formed with tips that engage and interlock each other, when the box is forced from its flat position to its set-up position. Tabs 12, 14, 16, and 18 are folded up onto the main panels of the container 20, 22, 24, and 26. This fold is such that the flaps have a tendency to spring back. Then the side panels of the container are folded and the ends joined to form the enclosure.

As the box is pushed on diagonally opposite corners 28 30 for setup, the resilience of the fiberboard material at the fold between the side panels and the flaps tend to cause the flaps to flatten out to form a bottom, in response to their effort to restore to their original unfolded position. As this occurs, the tips of panel 12 and 14 interfere with each other and die-cut edges 12' and 14' engage each other in a hooking fashion, pulling the flaps down to form a bottom in the box. Flaps 16 and 18 are then folded down over flaps 10 and 12 to complete the set-up operation.

Previous, folded automatic bottom boxes are known but they all require a glued connection between the end flap and the side flap at diagonal corners of the enclosure, to cause the side and end flaps to properly flex to form the bottom of the carton enclosure. This gluing operation is expensive and...