Importance

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Abstract

A roll of film is formed without a spool or core and the innermost end of the roll of film is formed into a closed loop of predetermined diameter. In a film viewing device, in which film is normally transported from a supply shaft to a take-up shaft, the supply shaft is provided with an adaptor which is mounted thereon for rotation therewith and is resiliently biased to be radially expandable from a diameter smaller than to a diameter larger than the predefined diameter. The roll film structure is mounted on the adaptor and the resilient biasing of the adaptor then forces it radially outward against the closed loop and securely holds the roll film for take-up. In a preferred embodiment the aforesaid adaptor comprises a stationary member adaptor to be mounted on the supply shaft or takeup shaft of a conventional viewing device, a pivotable member, means mounting the pivotable member to the stationary member for pivotal movement about an axis parallel to the shaft on which the stationary member is mounted, and resilient means mounted to urge the pivotable member away from be stationary member. The stationary and pivotable members are provided with opposed projections which are urged towards each other as the pivotable member is pivoted away from the stationary member. This construction permits the adaptor to be used not only on the supply shaft to receive a coreless roll film structure, but also as the reel on the take-up shaft.

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First Claim