Photographic cameras provided with exchangeable objectives

Claim 1

A PHOTOGRAPHIC CAMERA DESIGNED TO HAVE ATTACHED TO ITS CASING ANY ONE OF A PLURALITY OF EXCHANGEABLE OBJECTIVES, EACH OF WHICH INCLUDES AN OBJECTIVE MOUNT, A SPRING DIAPHRAGM THEREIN, A DIAPHRAGM ADJUSTING RING (3) ON SAID MOUNT, A DIAPHRAGM GROOVE RING (5) IN SAID MOUNT HAVING AN AXIAL PROJECTION (8) EXTENDING OUTWARDLY OF SAID MOUNT, AND COUPLING MEANS ON SAID MOUNT FOR DETACHABLY SECURING SAID OBJECTIVE TO SAID CASING, THE LATTER HAVING ROTATABLY MOUNTED THEREIN ABOUT THE OPTICAL AXIS OF SAID OBJECTIVE A DIAPHRAGM CLOSURE RING (9) HAVING AN AXIAL PROJECTION (10) WHICH WHEN THE OBJECTIVE IS ATTACHED TO SAID CASING ABUTS ONE SIDE OF SAID AXIAL PROJECTION (8) ON SAID DIAPHRAGM GROOVE RING (5) AND MOVES THE DIAPHRAGM TO ITS FULLY OPEN POSITION, MANUALLY OPERABLE MEANS WITHIN SAID CAMERA FOR ENGAGING A PROJECTION (13) ON SAID DIAPHRAGM ADJUSTING RING (3) FOR MOVING THE LATTER TO A POSITION INDICATING A PRESELECTED DIAPHRAGM APERTURE, SAID DIAPHRAGM ADJUSTING RING (3) HAVING THEREON A FURTHER RADIAL PROJECTION (4) FOR STOPPING SAID DIAPHRAGM GROOVE RING (5) WHEN THE LATTER IS RELEASED BY THE CAMERA SHUTTER, WHEREBY THE DIAPHRAGM IS ADJUSTED TO AN APERTURE WHICH CORRESPONDS TO SAID PRESELECTED APERTURE INDICATED BY THE POSITION OF SAID DIAPHRAGM ADJUSTING RING.