Shutter release and film advance interlock mechanism

Details Shutter release and film advance interlock mechanism Shutter release and film advance interlock mechanism

1987-05-07

1987-12-01

Hix, L. T.

G03B 1742

Patent

active

047100060

ABSTRACT:
A camera is provided wherein accidental manual rotation of a thumbwheel to advance film in the camera is prevented whenever the shutter is opened to take a picture. According to the invention, when a trigger button is manually depressed, a high energy member in a cocked position is unlatched to permit the high energy member to travel a first increment to momentarily open the shutter. The film advance thumbwheel remains locked by a locking member to prevent any rotation of the thumbwheel. When the trigger button is manually released to return to its original position, the trigger button disengages from the high energy member, permitting the high energy member to travel a second increment. During its second increment of travel, the high energy member moves the locking member out of locking relation with the thumbwheel. Thus the thumbwheel cannot be operated to advance film until picture-taking is completed.

REFERENCES:
patent: 3577900 (1971-05-01), Pickering et al.
patent: 3829874 (1974-08-01), Morino
patent: 3906530 (1975-09-01), Oshima
patent: 4193678 (1980-03-01), In Son
patent: 4595269 (1986-06-01), Wong

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