Film strip advance mechanism

Details Film strip advance mechanism Film strip advance mechanism

1974-02-21

1976-02-10

Aegerter, Richard E.

Optics: image projectors

Selective slide and film strip projector

352129, G03B 2300

Patent

active

039375684

ABSTRACT:
Advance shaft carries a sprocket for film engagement and carries manual knob for manually-controlled rotation. Framing shaft is rotatable with respect to projector housing and has an o-ring therebetween to serve as a drag brake. Advance shaft is detented with respect to framing shaft by means of an embracing spring. The drag brake of the framing shaft has a greater torque than the detent of the advance shaft with respect to the framing shaft.

REFERENCES:
patent: 1727900 (1929-09-01), Patterson
patent: 2330709 (1943-09-01), Harper et al.
patent: 2783680 (1967-05-01), Goldberg
patent: 3003393 (1961-10-01), Kilday
patent: 3628856 (1971-12-01), Jungjohann

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