Driving force-adjusting mechanism for camera shutter

Details Driving force-adjusting mechanism for camera shutter Driving force-adjusting mechanism for camera shutter

1977-01-21

1978-05-23

O'Connor, Edna M.

354242, G03B 962

Patent

active

040914011

ABSTRACT:
The operating mechanism for a camera shutter comprises a pivoted actuating member for opening the shutter and a pivoted actuating member for closing the shutter. A driving spring for biasing each of the actuating members in actuating direction has one end acting on the respective actuating member and the other end supported by a ratchet wheel which is coaxial with respective actuating member so that the spring bias can be varied by rotary movement of the ratchet wheel. Spring finger portions of a spring plate which overlies the shutter operating mechanism engage the ratchet wheels to retain them in selected angular positions against the reaction forces of the respective springs. Portions of the spring plate support the spring fingers intermediate their attachment to the spring plate and their free ends engaging the respective ratchet wheels.

REFERENCES:
patent: 2257012 (1941-09-01), Hineline
patent: 3739704 (1973-06-01), Akiyama

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