Connected disk binding mechanism

A booklet comprising:

• a plurality of binding members coaxially aligned to form a booklet hinge, the binder members including:
• a first disk ring portion configured for reception in a first binding recess of sheet members, the first disk ring portion has an inner surface that faces radially inward for engaging and retaining a first binding protrusion of the sheet members for binding the sheet members;
• a second disk ring portion configured for reception in the first binding recess of the sheet members, the second disk ring portion has an inner surface that faces radially inward for engaging and retaining a second binding protrusion of the sheet members for binding the sheet members;
• and
• an axial extension member associated with the first disk ring portion and extending generally in an axial direction with respect thereto, wherein the second disk ring portion is connected to the axial extension on an opposite side thereof from the first ring portion,
• wherein the first disk ring portion and the second disk ring portion are associated for cooperatively maintaining the first binding protrusion and the second binding protrusion engaged thereto and are configured for allowing the bound sheet members to slide around the first disk ring portion and the second disk ring portion while retaining the engagement;
• and
• a sheet binding portion of the sheet members for receiving and engaging to the binding members such that the sheet members are slidable around the binding members to move the sheet members around the booklet hinge,
• wherein the sheet binding portion defines binding recesses for receiving the binding members, such that the sheet member can be flipped around the binding members to turn the sheet member,
• wherein at least one of the sheet members is an expandable sheet member that includes
• a first sheet member portion having a binding edge and a second sheet member portion having a bindable edge opposite the binding edge, the first sheet member portion and the second sheet member portion hinged to each other at the intra-sheet hinge disposed between the binding edge and bindable edge,
• wherein at least one of the binding recesses is disposed on the binding edge and the bindable edge for engaging the binding members, and
• wherein the bindable edge has fewer of the binding recesses than the binding edge for easier engagement and disengagement of the bindable edge to the binding members coaxially aligned to form the booklet hinge.