| 摘要 |
The filler opening is formed by the forward edges of four walls (3,5,7,9). There are two opposite walls (5,9) which each have a movable supporting flap (29,30) at the forward edge, and which can be folded inside the opening. The free ends of the flaps are bent back against the inside surfaces of the respective walls and fixed to them, typically by gluing. The box can be formed by a single cut-out sheet, and the flap ends can form column-type round or polygonal hollow bodies. The flaps can extend for between 90% and 100% of the height of their respective walls, which can be of the same height as the other walls.
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