Patent ID: 7267261

Claim:
A box which has an opening-resistant base with break-off portions and is formed from a single piece of cardboard, comprising: four lateral walls, at least one base projecting from an end of one of said lateral walls, two flaps each projecting from the end of one of said lateral walls of adjacent the wall from which said base projects, said base consisting of a panel projecting directly from the lateral wall of the box and a tab projecting from an end of said panel, the panel being separated from the respective lateral wall and from the tab by parallel folding lines, said flaps also being separated from the respective lateral walls by folding lines and each having a hook-shaped tooth provided in proximity to the free end of the flap on a side thereof opposite the box base panel, the length of the two flaps being such that when they are folded one towards the other in the box when closed, the hook-shaped tooth of one flap becomes superposed on the hook-shaped tooth of the other flap, there being provided in the box base tab, in proximity with the folding line which separates the box base tab from the base from which said box base tab projects, a single central cut through which the hook-shaped teeth projecting from the two flaps on which the base panel is superposed in the box when closed are positioned and extend, wherein a breakable knurling extends on said base panel from each end of said cut as far as an adjacent lateral edge of the base panel such that said box is openable only by tearing of said knurling.