Card – picture – or sign exhibiting – Photographic transparency viewer – e.g. – x-ray viewer
Patent
1979-04-02
1980-10-07
Pitrelli, John F.
Card, picture, or sign exhibiting
Photographic transparency viewer, e.g., x-ray viewer
40564, 40575, 353DIG1, G02B 2702
Patent
active
042260388
ABSTRACT:
A device for displaying photo-slides having a panel with a light source behind it and several sets of parallel rails to support photographic slides for viewing. Each set of rails has an upper and lower rail that are spaced to support the top and bottom of the back surface of the photo-slides, and on the upper rail there is a series of pick off teeth with a stop surface protruding above the rail at a height slightly less than the thickness of a photo-slide. A slide handler box receives a stack of photo-slides and slides along, astride the upper and lower rails so that as the stack engages a pick-off tooth, a single photo-slide is engaged, stripped away, and stopped in place on the rail. The back of the handler box has an opening at the bottom just wide enough to allow one photo-slide to pass. The upper rail has a shorter support rail alongside it and the lower rail has a taller support rail alongside it, so that when the panel is tilted, the photo-slides fall off the upper and lower rails to be supported on the upper side of the lower support rail, free of restraint of the pick-off teeth. Therefore, when the panel is lowered, the photo-slides are free to slide along the upper slide support rail and the lower rail and are aligned by the rails for stacking in the handler box.
REFERENCES:
patent: 1629104 (1927-05-01), Honey
patent: 2812056 (1957-11-01), Jenkins
patent: 3244273 (1966-04-01), Niklund
patent: 4152852 (1979-05-01), Brown
Pitrelli John F.
Skillington G. Lee
Stidham Melvin R.
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