| 摘要 |
An improved "twist-lok" binder ring metal 10 includes binder rings (12-16) comprised of pairs of binder ring halves having an end attached to leaves (18, 20). Each leaf has swedges (18a, 18b, 20a, 20b) are spaced along the length of the metal. A cover (22) fitting over the leaves has spaced openings (24) through which ring halves extend. The cover and leaves only have a point contact with each other, and the leaves extend away from the cover at a relatively shallow angle. The binder is opened by someone exerting finger pressure on one of the rings and twisting the ring halves apart. Because of the shallow angle of the leaves with respect to each other, the leaves do not readily rotate to a ring open position if the binder is dropped or bumped. The result is a ring metal readily opened by use of finger pressure on a binder ring, but which will not open if the binder is bumped or dropped.
|
