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US 2006/0216106 A1Published application
Easy to open ring binder mechanism
OwnerWang Laminventor
Life of this patent
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Abstract
The ease with which a metal ring binder mechanism can be opened is improved by adding at least one auxiliary helper spring for reducing the spring force applied by the spine to the blades which support the rings, so as to decrease the force required to open the rings, without affecting the page-retaining power of the binder mechanism.
Claims5
In a ring binder mechanism comprising a metal spine having lateral edges,
- a pair of blades held in edgewise compression between the lateral edges of the spine whereby the spine provides a spring action affecting hinging movement of the blades, and
- at least two rings formed in two halves, each ring half having a lower end affixed to one of the blades and a tip adapted to engage the tip of an opposite counterpart ring half when the rings are closed, the improvement comprising
- at least one helper spring for reducing the spring action of the spine upon the blades so as to decrease the force needed to open the rings.
Dependencies are inferred from the claim text.