Centrifugal brakes for focal plane shutters

Details Centrifugal brakes for focal plane shutters Centrifugal brakes for focal plane shutters

1978-09-13

1980-05-27

Gonzales, John

354252, G03B 932

Patent

active

042047625

ABSTRACT:
In a focal plane shutter having two curtains which unwind from shafts after being released, the shaft controls a master gear, causing a keying pin on the latter to activate braking action on the curtain at a time interval near the terminal end of running-down movement of the curtain, as a pair of heavy expanding frictional shoes are driven to rotate at accelerated speeds and pressed against the internal surface of a fixed drum by a centrifugal force. During the shutter cocking operation, the key is taken out of connection with the brake so that the driving torque of the film winding shaft is correspondingly decreased.

REFERENCES:
patent: 1707849 (1929-04-01), Fairchild
patent: 2758527 (1956-08-01), McFadden

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