| 摘要 |
There is disclosed a device for retaining a stack of hole-punched papers in a file, e.g. an arch lever mechanism for an arch lever file. The device comprises: a base (10); at least two rings (14) secured to and extending upwardly from the base for engaging the punched holes in the papers, each ring having a pin (16) for holding the papers when the file is closed and an arched section (18), whereby papers on the top of a stack can be slid over the first section and retained on the second section so that papers lower down the stack can be exposed; and a mechanism for holding the first and second sections in a closed position in which the first and second sections form a closed ring and an open position (as shown) in which the pins and the arched sections are separated to allow papers to be added to, ro removed from, the rings and two additional pins (20) without corresponding arched sections, the use of the additional pins which has the advantage that papers are held more securely on the pins (16, 20) than is the case with only two pins and yet the mechanism for opening and closing the rings is identical to the two ring device and is simpler than a device with four rings. |
