Filing frame of film mounts

Claim 1

A filing frame for film mounts, comprising a substantially rectangular plate-like framework having a plurality of rectangular window openings disposed in a lattice form; a plurality of longitudinal straight ribs disposed on the upper surface of the framework parallel to a longitudinal edge of the rectangular framework and extending along longitudinal edges of the window openings with a spacing therefrom, the spacing between adjacent longitudinal ribs being not less than the lateral width of each film mount to be held by the filing frame; a plurality of lateral straight ribs disposed on the upper surface of the framework at right angles to the longitudinal ribs and extending along lateral edges of the window openings with a spacing therefrom, the spacing between adjacent lateral ribs being not less than the longitudinal width of each film mount to be held by the filing frame; seating ledges extending between the edges of the window openings and the ribs; a pair of resilient holding lugs extending along opposing side edges of each window opening, each holding lug extending from the top of one of said ribs and being so inclined as to gradually approach the seating ledge as the lug extends away from said rib; and a pair of notches for each window opening comprising cut-away parts of the seating ledges underneath the holding lugs, said notches having bottom edges and border edges between said bottom edges and the edges of the remaining portions of said seating ledges, the space between said bottom edges of each window being free and of a length not less than said longitudinal width of the associated film mount whereby each film mount being filed can swing about said border edges of the seating ledges while allowing a part of the film mount to freely pass through the notches.