| 摘要 |
An improved self-lifting apparatus for box cover comprising a <custom-character file="US20040016675A1-20040129-P00900.TIF" wi="20" he="20" id="custom-character-00001"/>-shaped bar provided on the box cover with both ends bended to accommodate elastic component. The elastic component is provided with extended arms on both ends, one end pressing the <custom-character file="US20040016675A1-20040129-P00900.TIF" wi="20" he="20" id="custom-character-00002"/>-shaped bar and the other end being inserted into the hole of the box, thereby simplifying the production procedure and allowing box cover to be lifted automatically. With the elastic component, the <custom-character file="US20040016675A1-20040129-P00900.TIF" wi="20" he="20" id="custom-character-00003"/>-shaped bar can be used as file holder in the box and the box can be used for a longer period of time.
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