A space-saving ring binder is in a collapsed position when not in use, for example, during packing, shipping, storage, occupying shelf space, and in an upright position when in use retaining paper. The thickness of the ring binder is significantly less when in the collapsed position than when in the...http://www.google.de/patents/US5642954?utm_source=gb-gplus-sharePatent US5642954 - Space-saving collapsible ring binder
