Patent ID: 7673407

Claim:
A document case comprising, a) a substantially planar frame having at least a first and second planar portion, each planar portion including a common sides surface that is adjacent one another and an opposite side surface opposite the common side surface, b) at least one hinge providing a hinged connection along the common side surface, the hinge having a rotary axis disposed parallel and coupled to the common sides surface, wherein the planar portions fold towards each other, wherein the common side surfaces form the interior of the case and the opposite sides surfaces thereof form the exterior of the case, c) two pairs of roller supports extending upward from the periphery of common side surface of each of the first and second planar portions of said substantially planar frame by a vertical distance, each of said pair of roller supports defining an axial support for a roller, the axes thereof being parallel to the rotary axis of the hinge, d) wherein a first of the two pairs of the roller supports are disposed on the first planar portion a first distance and a second of the two pairs of the roller supports are disposed on the second planar portion a second distance, wherein the first and second distances are non-equidistant from the rotary axis and are offset from one another by an offset distance.