Iris diaphragm shutter

Claim 1

A PHOTOGRAPHIC SHUTTER MECHANISM COMPRISING, IN COMBINATION, SUPPORTING MEANS; A SHUTTER MOUNTED ON SAID SUPPORTING MEANS AND INCLUDING AN IRIS DIAPHRAGM MOVABLE BETWEEN A CLOSED POSITION AND A PLURALITY OF OPEN POSITIONS DEFINING DIFFERENT APERTURES, SAID SHUTTER INCLUDING SHUTTER OPERATING RING AND A PAIR OF PINS SECURED TO SAID RING, SAID RING AND SAID PINS BEING MOVABLE BETWEEN A POSITION OF REST IN WHICH SAID IRIS DIAPHRAGM IS IN SAID CLOSED POSITION, AT THE PLURALITY OF OPERATIVE POSITIONS IN WHICH SAID IRIS DIAPHRAGM IS IN SAID OPEN POSITIONS, RESPECTIVELY; A SUPPORTING PLATE TURNABLY MOUNTED ON SAID SUPPORTING MEANS FOR TURNING MOVEMENT ABOUT AN AXIS COINCIDING WITH THE CENTER OF SAID IRIS DIAPHRAGM, AND HAVING A PAIR OF PART-CIRCULAR SLOTS, SAID PINS BEING RESPECTIVELY, LOCATED IN SAID SLOTS, SAID PLATE BEING TURNABLE WITH SAID SLOT RELATIVE TO SAID PINS BETWEEN A POSITION OF REST, AND A PLURALITY OF SETTING POSITIONS IN WHICH THE END OF AT LEAST ONE OF SAID SLOTS IS LOCATED IN THE PATH OF MOVEMENT OF THE RESPECTIVE PIN FOR STOPPING THE SAME AND THEREBY SAID RING IN SAID OPERATIVE POSITIONS, RESPECTIVELY; AND A SHUTTER ACTUATING MECHANISM MOUNTED ON SAID PLATE AND INCLUDING A FIRST SPRING-LOADED MEMBER INCLUDING A FORKSHAPED PORTION EMBRACING THE OTHER PIN, A SECOND SPRINGLOADED MEMBER, AND A RELEASE LEVER, SAID RELEASE LEVER TENSIONING SAID SECOND SPRING-LOADED MEMBER WHILE TURNING THE SAME FROM A POSITION LOCATED ON ONE SIDE OF SAID FIRST SPRING-LOADED MEMBER TO A POSITION LOCATED ON THE OTHER SIDE OF SAID FIRST SPRING-LOADED MEMBER SO THAT UPON RELEASE OF SAID SECOND SPRING-LOADED MEMBER, SAID SECOND SPRING-LOADED MEMBER MOVES RAPIDLY AGAINST SAID FIRST SPRING-LOADED MEMBER TO MOVE THE SAME WITH SAID FORKSHAPED PORTION AGAINST SAID OTHER PIN FOR MOVING SAID OTHER PIN UNTIL SAID ONE PIN IS STOPPED BY THE END OF SAID SLOT, WHEREUPON SAID FIRST AND SECOND SPRING-LOADED MEMBERS TURN TO THEIR INITIAL POSITIONS.