Endless film cartridge and pressure support plate therefor
AssigneeC. A. Parshall, Inc.
InventorLeon M. Levy
Life of this patent
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Abstract
A film cartridge is provided to hold an endless film strip for storage and display. The cartridge includes a pressure support plate to hold the film in a focus plane for projection, which plate is a resilient, generally ellipsoidal loop with a front projection opening and means for securing the loop to the cartridge in a position to resiliently and uniformly press against the perimeter of the front opening in the cartridge to thereby guide and control motion of the film strip.
Claims11
A pressure support plate for film in a film cartridge adapted to hold an endless strip of film for storage and for display in a projector, said cartridge including a housing with upper and lower surfaces, a front and sides, a projection aperture in said front, a film storage chamber, and guide members for directing said film serially from said chamber to said projection chamber and back, said support plate including
- an ellipsoidal loop having elongated front and rear sections,
- said front section being generally planar and having a projection opening in the center thereof and projector alignment openings in at least one edge thereof,
- said front and rear sections being spaced sufficiently to receive a projection mirror between them and in line with said front projection opening,
- means formed integrally with said rear section for securing said loop to one of said surfaces,
- said loop being made of resilient material and dimensioned relative to its mounting position on said surface, to resiliently press toward the perimeter of said front projection aperture,
- whereby film may be driven in said cartridge and will be held in a projection plane at said projection aperture.
A molded plastic film cartridge adapted to hold an endless strip of film for storage and for display in a projector, said cartridge including
- a housing formed of upper and lower complementary sections secured together and including a film storage chamber and guide means for directing said film into and out of said chamber,
- a projection aperture in the front of said housing
- an ellipsoidal plastic loop mounted behind said aperture, said loop including a front planar surface and a rear portion, said front planar surface including a projection opening, said rear portion being secured to one of said housing sections, and said front surface being proximate to the periphery of said projection aperture, said loop being made of resilient material and dimensioned relative to its position on said housing section to resiliently press toward the perimeter of said front projection aperture,
- whereby said endless strip of film will, when driven in said cartridge, be held in a projection plane at said projection aperture.
Dependencies are inferred from the claim text.