| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging box whose lid flaps can be locked in a state of being turned back. SOLUTION: At respective ridges formed by side boards 1, 2 and the lid flaps 4, 5, respective two cut lines 8, 9 forming locking strips 10 are slanted in the same direction, and each locking strip 10 is folded in a twisted move by the thumbs of hands with which the lid flaps 4, 5 are opened. As a result, the part of each rock strip 10 that faces the outward cut line 8 is engaged with respective cut edge of the lid flaps 4, 5 to lock the turned back lid flaps. COPYRIGHT: (C)2004,JPO
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