Signals and indicators – Navigation devices
Patent
1976-02-24
1977-07-05
Gonzales, John
Signals and indicators
Navigation devices
116114J, 354215, 354217, G03B 1900
Patent
active
040343936
ABSTRACT:
A device for providing means enabling a user to rewind a partially-exposed film strip packaged in a film cassette, to then remove the cassette from the camera, and thereafter to reinsert the film into the camera with the assurance of correct registration of the previously-exposed frames with the shutter opening and with the camera frame counter. This invention also pertains to the method of modifying the film strip to form the device. One embodiment of the device is a small, rectangular laminated tab having a body of flexible plastic material formed into a compressible hook at one end, which tab is installed near the tongue end of the film either by the user or by the film manufacturer. The bottom lamination of the tab is of self-adhesive material for adhering the tab to the tongue end of a film strip and the top lamination is a decalcomania having film index marks and a set of numerals at least equal to the number of exposure frames of the film printed thereon, the numerals being of a rub-off nature. When the tab is properly installed on the film tongue end, installed in a camera, and the index marks aligned with the camera drive sprocket teeth, a desired number of exposures is then made. The film can then be rewound into the cassette with the tab hook preventing rewinding of the tongue into the cassette, the cassette removed from the camera, and the last exposed frame number recorded by rubbing off the corresponding numeral from the decalcomania. Subsequently, the cassette can be reinstalled in the camera, the index marks realigned with the drive sprocket teeth, and the film accurately advanced to the next unexposed frame.
REFERENCES:
patent: 2591417 (1952-04-01), Frye
patent: 3460449 (1969-08-01), Eagle
patent: 3894507 (1975-07-01), Koechlin
Gonzales John
Wiggins Macdonald J.
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