| 摘要 |
<p>At least two creases (3, 4) are made near the upper part of a folding line (2) of a cardboard sheet. The creases extend diagonally from the folding line to the edge of the cardboard sheet. A perforation (5) is in the folding Ine between the diagonal creases and at a distance from the edge. When the cardboard sheet is folded into a folder along the folding line, the cardboard is also pushed inwards between the creases, wherein an internal nose is formed between the folds of the sheets. When the folder is now opened the nose also opens and the perforation in the middle of the nose becomes visible. A pen can then be pushed through this nose (21). The perforation has been made so that when the pen is in its position the force caused by edges of the perforation against the sides of the pen keeps it tightly in its place and prevents it from sliding away from the perforation. <IMAGE></p> |
