Camera with film thread indicating mechanism

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

354212, G03B 1700, G03B 100

Patent

active

043347533

ABSTRACT:
A unitary, movable lever permits a photographic camera to be test operated in the absence of film and, when the camera is loaded with film, permits an exposure to be initiated only if the film has been properly threaded and advanced. With no film in the camera, the lever is urged to a first position which permits actuation of the shutter. When the camera is initially loaded with film, a sensing pin engages an edge of a laterally trimmed film leader and moves the lever to a second position in which it blocks actuation of the shutter and provides a visual indication of the blockage in the camera viewfinder. If the film is properly attached to the take-up spool and advanced a sufficient distance, a widening portion of the leader, adjacent the full-width of the light sensitive film portion moves past the sensing pin. The sensing pin is moved by the widening leader thereby causing the lever to move to a third position in which it again permits actuation of the shutter.

REFERENCES:
patent: 1389164 (1921-08-01), Roikjer
patent: 2766669 (1956-10-01), Weisse et al.
patent: 4104664 (1978-08-01), Winkler et al.
patent: 4134657 (1979-01-01), Nomura
patent: 4176927 (1979-12-01), Wagensonner

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Camera with film thread indicating mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Camera with film thread indicating mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera with film thread indicating mechanism will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1916525

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.