| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a box which has excellent rigidity and permits no dust to enter the inside of the box. SOLUTION: Folding lines 6, 11 are formed at side plates 4 and end plates 9. Supporting pieces 7 which meet the inner surface of the end plate 9 are formed at both edges of the side plate 4 positioned above the folding line 6, and the heights of the upper edge of the supporting piece 7 and the upper edge of the side plate 4 are roughly made to meet each other. The end plate 9 and the side plate 4 are restrained from inclining by the supporting piece 7 to hold its shape firmly. A clearance between the side plate 4 and the end plate 9 is covered to inhibit dust from entering the inside of the box.</p> |
