1975-02-21
1976-12-21
Braun, Fred L.
354328, 354335, B01F 1300, G03D 304
Patent
active
039984346
ABSTRACT:
Apparatus for rocking photographic developing trays includes an open frame for holding a plurality of rectangular trays of preselected size nested within the frame. Rocker tabs attached to each end support the frame for rocking motion on a suitable flat surface. A separate base member includes a pivot for positioning the base with respect to a pivot point at the center of a transverse brace joining opposite sides of the frame. An electrical drive motor mounted on the base member is eccentrically coupled to the frame for rocking the frame on the rocker tabs at predetermined amplitude and frequency. The frame is assembled from flat metal strips, two U-shaped ends joined by two straight center strips; so that the frame is stiff in bending to support the weight of the trays but can warp to provide a twisting rocking motion for improved mixing of the tray contents. Transverse tray racks can be laid across the frame to support trays smaller than the preselected size for processing small print batches.
REFERENCES:
patent: 766483 (1904-08-01), Wolfe
patent: 1352330 (1920-09-01), Tyler
patent: 2494866 (1950-01-01), Fressola
patent: 2877700 (1959-03-01), Keller
patent: 3478666 (1969-11-01), Bishop
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