Ring binder

  • US 5,354,142 A
  • Filed: 12/04/1991
  • Issued: 10/11/1994
  • Est. Priority Date: 05/03/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. 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.

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