Photographic enlarging equipment and method

Details Photographic enlarging equipment and method Photographic enlarging equipment and method

1977-03-04

1978-04-25

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

With temperature or foreign particle control

355 77, G03B 2752, G03B 2732

Patent

active

040860094

ABSTRACT:
A selectively operable switch, separate and distinct from the conventional on/off switch, is electrically connected into the fan control circuit of a photographic enlarger, for selective operation, as by the foot of the operator, to turn off the fan, and thus eliminate any vibrations caused by same, for certain operations, as when making an internegative; and for turning the fan back on after such operations to provide cooling air to protect the lenses and other components within the enlarger head. Alternatively, the fan and its drive motor are housed at a location removed from the enlarger head with a flexible tube connecting the outflow from the fan to the enlarger head to provide the air for cooling the enlarger lenses and other components housed within the enlarger head.

REFERENCES:
patent: 2014285 (1935-09-01), Morrall
patent: 2344558 (1944-03-01), Moore
patent: 2849915 (1958-09-01), Kennedy
patent: 3025758 (1962-03-01), McAdam et al.
patent: 3222985 (1965-12-01), Remesat
patent: 3252370 (1966-05-01), Luther

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