Camera range-finder adjustment system

Claim 1

A PHOTOGRAPHIC CAMERA COMPRISING A HOUSING, A DROP BE, A HINGE CONNECTING SAID DROP BED TO SAID HOUSING, A LENS CARRIER ADAPTED TO RECEIVE ANY ONE OF A PLURALITY OF LENSES EACH OF PREDETERMINED DIFFERENT FOCAL LENGTH, A TRACK LOCATED ON SAID DROP BED, SAID CARRIER BEING SUPPORTED ON SAID TRACK, MEANS FOR DISPLACING SAID TRACK AND SAID CARRIER ALONG SAID DROP BED TO ASSUME VARIOUS POSITIONS OF FOCUS, A MOVABLE RANGEFINDER ACTUATING MEMBER MOUNTED ON SAID HOUSING, A FIRST ROTARY CAM DISC PROVIDED WITH SEPARATE CAM SURFACES EXTENDING OVER DIFFERENT ANGULAR RANGES OF THE CAM DISC, EACH OF SAID SURFACES BEING SHAPED IN ACCORDANCE WITH A RESPECTIVE LENS OF PREDETERMINED FOCAL LENGTH, A SECOND ROTARY DISC MOUNTED ON THE DROP BED FOR ROTATION ABOUT THE SAME AXIS AS THE SAID FIRST ROTARY CAM DISC, MEANS FOR ROTATING SAID SECOND ROTARY DISC IN DEPENDENCE ON THE DISPLACEMENT OF SAID TRACK, A CAM FOLLOWER MEMBER ENGAGING A SELECTED CAM SURFACE AND ACTING TO ADJUST THE MOVABLE RANGEFINDERACTUATING MEMBER AND THUS THE RANGEFINDER IN ACCORDANNCE WITH THE POSITION OF THE SAID TRACK ON THE SAID DROP BED, AND MEANS FOR SECURING SAID FIRST AND SAID SECOND ROTARY DISCS TOGETHER FOR CONJOINT ROTATION, SAID MEANS INCLUDING A LOCK MEMBER, A RESILIENT MEMBER CONNECTING SAID LOCKING MEMBER OF SAID SECOND ROTARY DISC, MEANS ON SAID FIRST ROTARY CAM DISC FOR COOPERATION WIITH SAID LOCKING MEMBER, AND MEANS TO RELEASE SAID LOCKING MEMBER TO PERMIT RELATIVE ROTATION OF SAID DISCS.