04522526 is referenced by 69 patents and cites 8 patents.

Ring mechanism for loose leaf binders, and method of manufacture therefor, which has actuating or booster levers which serve both to open and close the rings. Mating ring segments or portions are affixed at corresponding spaced locations to a pair of metallic rods or rails. The outer ends of the rods of oval cross section include crank arm portions, with flattened tangs at the terminal ends thereof formed during fabrication on a rail of continuous length which is then severed to provide identical rail and ring segment components. The rail and ring components are then assembled in parallel relation within the inturned edge channels of a spring metal cover plate or case of arcuate cross section which is tensioned to hold the ring segments in closed relation. Each of the booster levers is slotted to engage opposite surfaces of the tangs for pivoting the rods about their longitudinal axes in response to pivotal movement of the booster levers whereby the rings are selectively opened and closed by said levers.

Title
Ring mechanism for loose leaf binders and method of manufacture therefor
Application Number
6/392559
Publication Number
4522526
Application Date
June 28, 1982
Publication Date
June 11, 1985
Inventor
William H Lucey
Holyoke
MA, US
Arthur Lozfau
Belchertown
MA, US
Agent
Chapin Neal & Dempsey
Assignee
Dennison National Company
MA, US
IPC
B42F 13/36
B42F 3/04
B42F 13/22
B42F 13/00
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