| 摘要 |
PROBLEM TO BE SOLVED: To firmly connect mutual boxes to keep a stacked state by integrally forming corner plates which are foldable at folds where the upper parts thereof are inclined somewhat inwardly from a perpendicular line and integrally and erectably forming a pair of erecting plates oppositely arranged at respective side edges of the bottom plate. SOLUTION: Engaging holes 3a are formed at the shorter side edges of a bottom plate 3. Corner plates 9 which can be folded at folds inclined somewhat inwardly are formed at both ends of first side plates 5. On assembling the box, the corner plates 9 are erected somewhat slantly toward the inside. The erecting plates 13 constituting second side plates 7 are a little inclined inwardly together with engaging projections 15b integrally formed therewith. In this stackable paper box 1, the engaging projections 15b of the lower stacking paper box 1 are engaged with the engaging holes 3a of the upper stacking paper box 1 to stack it. In this time, since the engaging projections 15b have a height equal to the longitudinal width of the top face plate 15 and slanted inwardly, the engaging strength of the projections with the engaging holes 3a is increased. |
