Photographic shutter mechanism

Claim 1

A SHUTTER MECHANISM FOR PHOTOGRAPHIC APPARATUS COMPRISING: MEANS DEFINING AN EXPOSURE APERTURE; AN OPENING BLADE NORMALLY BLOCKING THE EXPOSURE APERTURE, SAID OPENING BLADE BEING MOUNTED TO PIVOT ON A FIRST PIVOT AXIS TO UNBLOCK THE EXPOSURE APERTURE TO INITIATE EXPOSURE; A CLOSING BLADE NORMALLY UNBLOCKING THE EXPOSURE APERTURE, SAID CLOSING BLADE BEING MOUNTED TO PIVOT ON SAID OPENING BLADE ON A SECOND PIVOT AXIS SPACED FROM SAID FIRST PIVOT AXIS TO CLOSE THE EXPOSURE APERTURE TO TERMINATE EXPOSURE; SPRING MEANS FOR BIASING SAID OPENING BLADE TOWARD A LIGHT UNBLOCKING POSITION AND FOR BIASING SAID CLOSING BLADE TOWARD A LIGHT BLOCKING POSITION; FIRST LATCH MEANS FOR RETENTIVELY ENGAGING SAID OPENING BLADE; SECOND LATCH MEANS FOR RETENTIVELY ENGAGING SAID CLOSING BLADE AT A PREDETERMINED RADIAL DISTANCE FROM SAID FIRST PIVOT AXIS; AND AN ACTUATING MEMBER MOUNTING SAID OPENING BLADE AND BEING MOUNTED ON THE BASE MEMBER TO PIVOT ON A THIRD PIVOT AXIS DISTINCT FROM SAID FIRST AND SECOND PIVOT AXES FROM A NORMALLY CLOSED POSITION OVER THE EXPOSURE APERTURE TO A POSITION UNBLOCKING THE EXPOSURE APERTURE DURING THE EXPOSURE INTERVAL, WHEREBY ROTATION OF SAID ACTUATING MEMBER TO ACTUATE THE SHUTTER MECHANISM DRAWS SAID OPENING BLADE FREE OF SAID FIRST LATCH MEANS TO INITIATE EXPOSURE AND ROTATION OF SAID OPENING BLADE THROUGH A PREDETERMINED ANGULAR DISPLACEMENT DRAWS SAID CLOSING BLADE FREE OF SAID SECOND LATCH MEANS TO TERMINATE EXPOSURE.