Binder device releasably engaging aperture or notch of sheet – Sheet retainer travels arcuate path – Travel in plane perpendicular to axis of rotation
Patent
1984-01-16
1986-01-28
Bell, Paul A.
Binder device releasably engaging aperture or notch of sheet
Sheet retainer travels arcuate path
Travel in plane perpendicular to axis of rotation
402 33, 402 41, B42F 304, B42F 1316, B42F 1330
Patent
active
045668175
ABSTRACT:
A ring binding mechanism, for use with a binder or book having a backbone, has a curved housing which pivotally retains a pair of hinge plates carrying binding rings. A control bar, moveable between a first position and second position, is slideably affixed to the housing independent of the backbone by means of retaining rivets extending through the housing and through a slotted opening in the control bar. The control bar includes cam surfaces positioned to force the hinge plates inward towards the housing to close the binding rings as the control bar is moved to the first position, and cam surfaces positioned to force the hinge plates towards the housing to open the binding rings as the control bar is moved to the second position. The control bar further includes ratchet grooves which engage an intermeshing tongue to lock the control bar in a closed position.
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Bell Paul A.
Heyrana Sr. Paul M.
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