Looseleaf binder

Details Looseleaf binder Looseleaf binder

1990-03-15

1991-07-02

Watts, Douglas D.

Binder device releasably engaging aperture or notch of sheet

Resilient sheet retainer requiring deflection for sheet removal

Opposed sheet retainers

402 19, 402 39, 402 44, B42F 1302

Patent

active

050281593

ABSTRACT:
An economical lightweight looseleaf binder combines the functionality of a standard ring binder with easy-to-use characteristics of report covers. The cover is folded to define front and back panels as well as a spine portion, and additionally includes a crease at the longitudinal center line of the two ring assemblies which are both secured to the back panel. The ring assemblies include a series of hooks having complementary notched profiles which firmly engage one another when closed, yet may be easily disengaged through flexure of the cover. In one construction, the binder comprises a pressboard cover to which is attached a pair of plastic ring assemblies. The hooks are configured to permit filler sheets to lie flat and to facilitate transfer of sheets from one side to the other.

REFERENCES:
patent: 2071768 (1937-02-01), Schade
patent: 2178767 (1939-11-01), Unger et al.
patent: 2223030 (1940-11-01), Edler et al.
patent: 2363848 (1944-11-01), Emmer
patent: 2399561 (1946-04-01), Murphy
patent: 2664897 (1954-01-01), Derringer
patent: 3827111 (1974-08-01), O'Connell
patent: 4582442 (1986-04-01), Rager
patent: 4607970 (1986-08-01), Heusinkveld

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