| 摘要 |
A locking loose-leaf binder mechanism which has a curved housing retaining two hookplates, to which binder rings are attached. A control slide attached to each end of the housing includes one or two cam surfaces to engage the hookplates. In an embodiment incorporating two cam surfaces, one cam surface locks the binder rings in a closed position when the slides are fully retracted into the coverplate, and a second cam surface similarly locks the rings when the slides are fully extended from the coverplate. When the slides are neither fully extended nor retracted, the cam surfaces are in a neutral position and the rings may be opened. In further embodiments of the invention, a single cam surface may be employed, either to lock the rings when the slides are fully extended, or fully retracted. Each control slide end further includes a specially formed hanger tab to suspend the binder on a file-frame when the control slides are fully extended. This provides a rigid means to store the binder in a securely locked, inverted orientation. Binder appplications which do not require file-frame hanging capability may be fitted with only a single control slide.
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