Double torsion spring energy-storage photographic shutter

Claim 1

IN A PHOTOGRAPHIC SHUTTER HAVING TWO BLADE DEVICES OPERATING IN AN ALTERNATING SEQUENCE TO COMPLETE AN EXPOSURE FOR EACH PAIR OF SUCH OPERATIONS, A SYMMETRICAL SPRING DRIVE CONNECTED TO OF SAID BLADE DEVICES, INDIVIDUAL MEANS FOR LATCHING SAID SPRING DRIVES IN RESPECTIVE TENSIONED STATES TO HOLD THEIR BLADE DEVICES RESPECTIVELY CLOSED AND OPEN, MEANS FOR SEQUENTIALLY RELEASING THE INDIVIDUAL LATCHING MEANS TO INTIATE OSCILLATIONS OF SAID RESPECTIVE SPRING DRIVES FROM THEIR INITIAL TENSIONED STATES THROUGH THEIR UNSTRESSED NEUTRAL CONDITION AND TRANSIENTLY INTO PARTIALLY TENSIONED STATES OPPOSITE TO THOSE LAST OCCUPIED TO COMPLETE RESPECTIVE SHUTTER OPENING AND SHUTTER CLOSING PHASES OF ONE EXPOSURE, MEANS FOR LATCHING EACH OF SAID SPRING DRIVES ITS NEWLY ACQUIRED STATE OF PARTIAL OPPOSITE TENSION, AND MEANS FOR FURTHER AND FULLY TENSIONING EACH SPRING DRIVE IN ITS SAID NEWLY ACQUIRED STATE, IN PREPARATION FOR A FOLLOWING EXPOSURE IN WHICH THE OPENING AND CLOSING FUNCTIONS OF SAID BLADE DEVICES WILL BE INTERCHANGED.