Ring binder
AssigneeWorld Wide Stationery Manufacturing Company Limited
InventorCheng H. Yu
Life of this patent
Estimating the term…
Abstract
A ring binder includes a base member supporting a plurality of ring members, and an opening mechanism at each end of the base member for opening the plurality of ring members, each opening mechanism including lock means to lock the opening mechanisms in its closed position, the base member comprising a rigid upper structure supporting a pivotable lower structure to which the ring members are mounted, wherein at each end of the binder, the opening mechanism is coupled to and pivotally supported in the lower structure. In another embodiment the opening mechanism has an inbuilt degree of play before before acting to urge the lower structure to close the ring members for ease of operation.
Claims19
A ring binder including a base member supporting a plurality of ring members, the base member comprising a rigid upper structure supporting a pivotable lower structure to which the ring members are mounted, an opening mechanism at one or each end of the base member for opening the plurality of ring members, wherein the sides of the opening mechanism are permanently in contact with and pivotably supported on and by the lower structure, and lock means to lock the opening mechanism in its closed position.
A ring binder including a base member supporting a plurality of ring members, the base member comprising a rigid upper structure supporting a pivotable lower structure to which the ring members are mounted and an opening mechanism at one or each end of the base member for opening the plurality of ring members wherein the opening mechanism is pivotable about a fulcrum formed by the upper structure to urge the lower structure from a first to a second stable position, wherein the mechanism is disengaged from the fulcrum in an angular range, and wherein the fulcrum is at an angle relative to the rest of the upper structure.
Dependencies are inferred from the claim text.