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US 4,813,803 AGranted
Trigger mechanism for ring binder
AssigneeWilson Jones Company
InventorRichard L. Gross
Life of this patent
Estimating the term…
Abstract
A loose-leaf sheet binder mechanism with a case, hinge plates, ring halves and trigger lever to operate the hinge plates for opening and closing the ring halves. The case has first lock means on it in the form of a raised or dimpled member and the trigger lever has complementary second lock means on it.
Claims4
In a loose-leaf sheet lock mechanism having a case member, a pair of elongated hinge plates, ring halves mounted on the plates operable to form loose-leaf retaining rings, a trigger lever operable to move the plates from an open ring position to a closed ring position, the improvement comprising
- blister means on said case member;
- a convex section of trigger lever for positioning in and engagement with such blister means;
- first locking means formed in the blister means of the case member;
- and
- a second locking means on the trigger lever for interacting with the first locking means when the trigger lever is moved against the blister means.
2 more elements
Dependencies are inferred from the claim text.