| 摘要 |
The invention relates to a structure which can be folded flat, in a semi-rigid material such as cardboard. This structure comprises at least three flat parts 1, 2, 3 which adjoin along parallel folding lines which are cut out in such a way that they can be folded, thus forming, seen parallel to the said folding lines, a triangle which rests on one of its sides 1 forming a support and of which the other two sides 2, 3 bear on each other so as to form cross-bracing, one of the said other sides 2 being oriented vertically or slightly inclined to the vertical and possibly extending outside the triangle beyond the vertex opposite the side 1 forming a support. <IMAGE>
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