Twist lock ring binder

Details Twist lock ring binder Twist lock ring binder

2005-09-30

2008-12-09

Ross, Dana (Department: 3725)

Binder device releasably engaging aperture or notch of sheet

Resilient sheet retainer requiring deflection for sheet removal

Opposed sheet retainers

C402S019000

Reexamination Certificate

active

07461994

ABSTRACT:
An improved “twist-lok” binder ring metal10includes 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.

REFERENCES:
patent: 5660490 (1997-08-01), Warrington
patent: 5816729 (1998-10-01), Whaley
patent: 6036394 (2000-03-01), Cheng
patent: 6116804 (2000-09-01), Mehta
patent: 6328497 (2001-12-01), To
patent: 6764100 (2004-07-01), Miro
patent: 2005/0163557 (2005-07-01), England
patent: 2006/0153628 (2006-07-01), Tanaka et al.

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