Roll film cassette

#This invention relates to a film cassette and in particular to a cassette for roll film.

#Roll film is supplied in cassettes having in their circumferential wall an axially extending slot through which the film is incrementally withdrawn by the camera mechanism from the film coil inside the cassette. The film is wound onto a spool in the camera. When the film length is used up, i.e., when all exposures are made, the film is retracted into the cassette by reversing the film winding direction, and the cassette is then ready to be opened for removal of the film for developing of the same.

#Such cassettes are conventionally either constructed as a can having one permanently closed axial end and one open end which is provided with a cover, or else the tubular wall has both of its axial ends open and each of these ends is provided with a separate cover.

#The single FIGURE is an exploded perspective view, showing a roll film cassette according to the invention as well as a cover-removing tool.

#The FIGURE shows a novel roll film cassette in an exploded view. In addition, it illustrates a tool for removing the cover of the cassette; this is done for a better understanding of the inventive concepts but the tool itself does not form part of the invention.

#The cassette has a tubular or circumferential wall 1 which is provided with a longitudinally (i.e., axially) extending film slot 2 through which roll film (not shown) is withdrawn in a camera for purposes of making exposures and through which the same film is subsequently retracted again into the space bounded by the wall. To avoid the entry of light through slot 2 the opposite sides thereof are bounded by sealing strips 3, e.g., strips of synthetic plastic, felt or the like, which engage the film.

#Both axial ends of the tubular wall 1 may be closed by covers 6, or, as illustrated, one axial end may be permanently closed by a bottom wall which forms with the tubular wall 1 a "film can".