File binding system

A file binding system comprising a pair of elongated rigid support members for supporting a file along its edge, securing members for securing the support members in a binding position, each of the securing members being provided with securing portions adapted for fitting through and securing the support members from their outer sides to provide an effective clamp of the file between the support members, and adjustable extension members along the outer sides of said rigid support members, said rigid support members being separable from one another when removed from the binding position and said securing members being independent of said rigid support members other than in the binding position to facilitate binding adjustment, each of said extension members being two-tiered in construction and comprising a lower hollow tier and an upper tier section raised and extended relative to the lower tier, the lower tiers of said extension members being slidable within the support members which are shaped to cooperate with the lower tiers and which are undercut to secure the lower tiers therein, the upper tiers of said extension members being adapted to override the securing portions of the securing members, each of which is made of resilient material with said securing portions being folded beneath the hollowed triangular tiers of extension members, the resiliency of each securing member driving said securing portions to a locking engagement with said extension members, said extension members being retractable inwardly of the securing portions of the securing members to gain access to said securing portions.