Molded plastic one-piece loose-leaf binder ring structure
US5618122A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Mar 3, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42F13/22
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A molded plastic one-piece loose-leaf ring binder for use in binding loose perforated sheets, book pages and the like. A plastic elongated base strip is ridgidified by ribs extending longitudinally thereof, and has paired integral flexible lugs spaced longitudinally on opposite longitudinal sides of the base strip and extending laterally therefrom. The individual lugs each have an integral arm curved along a length of the arm extending laterally away from the corresponding lug and side of the base strip and each curves in a direction back toward the strip. The curved arms have a cross-section thickness greater than the thickness of the corresponding lug so that their curvature is maintained. The curved arms are paired on opposite sides of the strip and are sufficiently rigid as ring-forming elements insertable into holes of perforated sheets and free ends thereof of a pair locked together to define binder rings. The flexible paired lugs each form a hinge for corresponding paired curved arms on opposite sides of the strip to be manually biased toward each other and free-end portions thereof positioned in overlying relationship for manual pressing of the overlying free-end portions t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.