Ring Binder Mechanism

A ring binder mechanism for retaining loose leaf pages includes a frame having a first frame element and a second frame element. At least one ring has a first ring member mounted on the first frame element and a second ring member mounted on the second ring element. The first and second frame elements include ears projecting outward from the first and second frame elements. The ears receive a hinge pin to pivotally interconnect the first and second frame elements for pivoting motion relative to each other between closed and opened positions. A biasing member mounted on the hinge pin biases the first and second frame elements to the open position.