Plastic multi-ring paper binding system using one piece cover

Abstract From the Canadian patent

A binder apparatus for use in binding together sheets of paper, each correspondingly pre-aperatured with multiple openings along a margin includes a three panel one piece cover with a front and rear cover connected by a smaller cover spine portion with parallel scores defining respectively pivotal connections between each of the covers and the spine portions. A plastic ring-type binder includes a spine having an inner concave surface and an outer convex surface and parallel side portions, one side portion having multiple closely spaced flexible rings extending therefrom each with a single free end portion. One or more elongated adhesive bead member extends along the plastic spine convex …