| 摘要 |
Each of the side faces (3) of the cardboard box is extended by a flap. Each flap has four horizontal folding lines (b,c,d,e). The vertical distance separating the lines (b & c,d & e) is slightly greater than the length of the front face (4). Each of the two flaps is folded down through 180 deg along a folding axis (c) and assembled by sticking its side (9) on the inside of the side face which it adjoins. A pressure on each flap outer side (6) directed horizontally inwards forms the flaps into a parallelogram. When the flaps are in contact on their internal face (7) a vertical pressure on their outer faces forces them inside the box where they remain locked.
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