| 摘要 |
The method involves forming seat with a base on which rests a flat support surface, all made from a semi-rigid sheet material. The method involves forming the base and the support surface by self-locking folding of a single blank of material. The blank can have a rectangular section with transverse fold lines (5a-d). The fold lines separate the rectangle into at least three walls (6-10), two of which are connected by male-female joints.
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