Film cassettes
AssigneeIlford Limited
InventorClifford Mangan
Life of this patent
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Abstract
Cassette for a spool of photographic film, having a pair of lips through which the leading end of a roll of photographic film located in the cassette protrudes, the pair of lips consisting of an upper extended lip and a lower co-acting lip, the pair of lips leading to an internal extended peripheral slot through which the film is to be led, the slot consisting of an upper and a lower channel member, each channel member having an outer portion and a inner curved portion, the inner curved portion of the upper channel member forming part of the wall of the cylindrical cassette, the outer portion of the pair of lips being set at an angle to the cylindrical body of the cassette so as to constitute a tangent to a concentric circle which has a diameter of less than 0.8 of the internal diameter of the cylindrical cassette.
Claims31
A cylindrical cassette for a spool of photographic film, said cassette including a pair of lips through which the leading end of a roll of photographic film located in the cassette protrudes, said pair of lips comprising an upper extended lip and a lower co-acting lip, said pair of lips leading to an internal extended peripheral slot through which the film is to be led, the slot consisting of upper and lower channel members, each channel member having a outer portion and a inner curved portion, the inner curved portion of the upper channel member forming part of the wall of the cylindrical cassette, the extended portion of the pair of lips being set at an angle to the cylindrical body of the cassette so as to constitute a tangent to a concentric circle which has a diameter of less than 0.8 of the internal diameter of the cylindrical cassette.
A light proof film cassette which comprises a film spool in a casing which comprises two semi-cylindrical body members of opaque plastics material, which members are provided with end walls having semi-circular openings adapted to receive the hub of a film spool having at each end a flange, each of which abuts an end wall of the two assembled body members, the bottom and side edges of the said members having interlocking means to render light-tight the assembled cassette, one of said members having an extended lip and the other a co-acting lip, the lips forming a narrow slot for the passage of the film from the spool out of the cassette, the end walls of said lips having interfitting members, each body member having at each end a semi-cylindrical axial extension of the body on which are present two lugs, one at each end of the extension, each of said lugs on one body member being adapted to co-act with the corresponding lugs on the other body member to form four pairs of locking means which hold the two body members locked together when the cassette is in the assembled state.
Dependencies are inferred from the claim text.