Electric shutter with positive motion device

Details Electric shutter with positive motion device Electric shutter with positive motion device

1974-04-10

1976-03-23

Hix, L. T.

354245, 354246, G03B 940, G03B 962

Patent

active

039464148

ABSTRACT:
An electric shutter with a positive motion device that insures positive action of the shutter. The shutter has a depressable release member that is restored by a spring when pressure thereon is released so that the release member is reset when the shutter is opened. When the shutter is cocked the mechanical positive motion device is mechanically releasably locked maintaining the shutter blade or blades against biasing springs. When the release member is depressed the shutter is opened and an electromagnet of an exposure control circuit is energized and an attractable lever in the positive motion device is held attracted by the energized electromagnet releasably controlling the release of members that release the shutter blade or blades for actuation to a shutter-closing position. A mechanical locking member in conjunction with a press lever in the positive control device positively locks the attractable lever in the same position as when attracted when the shutter is cocked. Upon energization of the electromagnet the mechanical locking member is released and positive actuation of the attractable element is insured even though the release member is restored by a biasing spring thereof.

REFERENCES:
patent: 3535989 (1970-10-01), Kitai
patent: 3601019 (1971-08-01), Kitai
patent: 3645186 (1972-02-01), Kitai
patent: 3698304 (1972-10-01), Tenkumo
patent: 3722392 (1973-03-01), Kitai

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