1. Field of the Invention
The present invention relates to an improved self-lifting apparatus and, more particularly, to an improved self-lifting apparatus for box cover and is conveniently assembled, and allows box cover to be lifted automatically and can be used as file clip in the box.
2. Description of the Prior Art
As shown by
The conventional self-lifting apparatus is useful for the non-complicated boxes, such as cashbox and pencil box, and is, however, inconvenient for the complicated products such as portable safe. Disadvantages are as illustrated as follows:
1. The conventional self-lifting apparatus is assembled in a fixed manner that requires both iron wire and wrapping edge to be installed in the box before the parts are assembled and, therefore, production becomes time-consuming and the apparatus can be broken easily. When installed in the safe made of hard materials, the conventional self-lifting apparatus can be used approximately five thousand times only.
2. The conventional self-lifting apparatus allows box cover to be lifted with its flexibility. To include file holders in the box, holed pieces have to be installed underneath the cover to allow the -shaped bars with outward-bended ends to penetrate through and, therefore, the production requires a few more steps and the costs of materials and labors increase as well.
To solve the problems related to the conventional self-lifting apparatus, the present invention is provided with an improved self-lifting apparatus comprising a -shaped bar provided on the box with both arms bended to accommodate elastic component. The elastic component is provided with extended arms on both ends, one end pressing the -shaped bar and the other end being inserted into the holes of box, and thus simplifies the production procedure, facilitates the assembly process, and allows the box cover to be lifted automatically. With the elastic component, the -shaped bar can be used as file clip in the box and the box cover can be used for a longer period of time.
Other advantages of the invention will be evident from the following detailed description when read in conjunction with the accompanying drawings that illustrate one preferred embodiment of the invention.
Referring to
The lower ends of the -shaped bar's both arms 11 bend inwards 12. The bending area 12 and both arms 11 align in “<” shape. The elastic component 3 is a spring pressing the extended arm 31 of the arms 11 and is provided with a bended ring 33.
As shown by
As shown by
As shown by
The self-lifting apparatus of present invention simplifies the production procedure and can be used as file holder and, most importantly, can be used at least ten thousand times, thereby upgrading quality and durability of products.
Number | Name | Date | Kind |
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790578 | Kirby | May 1905 | A |
2442873 | Graham | Jun 1948 | A |
2557048 | Haase | Jun 1951 | A |
2682969 | Sunko | Jul 1954 | A |
3438152 | Cadiou | Apr 1969 | A |
4458379 | Shelton | Jul 1984 | A |
4524438 | Einhaus | Jun 1985 | A |
4590692 | Leonardi | May 1986 | A |
5041818 | Liu | Aug 1991 | A |
Number | Date | Country |
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438877 | Jun 1967 | CH |
Number | Date | Country | |
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20040016675 A1 | Jan 2004 | US |