Clutch and brake shutter operating mechanism

Claim 1

A SHUTTER OPENING AND CLOSING MECHANISM COMPRISING A PRIME MOTOR FOR OPENING AND CLOSING A SHUTTER AND HAVING A DRIVING SHAFT, A MAIN CLUTCH COUPING DISC HAVING AN ENGAGING PART ON ITS COUPLING END SURFACE SLIDABLY MOUNTED ON SAID DRIVING SHAFT, AN AUXILIARY CLUTCH COUPLING DISK HAVING AN ENGAGING PART ENGAGEABLE WITH AND DISENGAGING FROM THE ENGAGING PART OF SAID MAIN CLUTCH COUPLING DISK LOOSELY FITTED ON SAID DRIVING SHAFT, A DRIVEN SHAFT ARRANGED COAXIALLY WITH SAID DRIVING SHAFT AND ADAPTED TO BE COUPLED TO A SHUTTER, A FURTHER CLUTCH COUPLING DISK SLIDABLY MOUNTED ON SAID DRIVEN SHAFT, THE RESPECTIVE OPPOSED SURFACES OF THIS COUPLING DISK AND SAID AUXILIARY CLUTCH COUPING DISK HAVING A PLURALITY OF SLOTS THEREIN HAVING A SHAPE FOR RECEIVING A BALL AND BEING ARRANGED IN A PLURALITY OF PAIRS, A SPHERICAL BODY HAVING A SLIGHTLY SMALLER DIAMETER THAN THAT OF THE PAIR OF SLOTS POSITIONED IN EACH PAIR OF OPPOSED SLOTS, A CASING, A CONE BRAKE BETWEEN SAID FURTHER CLUTCH COUPLING DISK AND THE INNER WALL OF SAID CASING, AND RESILIENT MEANS URGING SAID FURTHER CLUTCH COUPLING DISK TOWARD SAID AUXILIARY CLUTCH COUPLING DISK, WHEREBY DRIVING CONTROL CAN BE FREELY ACHIEVED IN RESPONSE SOLELY TO TORQUE CONTROL WITHOUT REQUIRING RELATIVE MOVEMENT BETWEEN THE DRIVING AND DRIVEN SHAFTS; AND AN ACTUATING CLUTCH DISK FOR RELEASING SAID BRAKE COUPLED TO SAID BRAKE AND LOOSELY FITTED ON THE DRIVING SHAFT, A CABLE COUPLED TO SAID ACTUATING CLUTCH DISK, A FIXED CLUTCH DISK, FIXEDLY SECURED, TO THE CASING AND LOOSELY FITTED AROUND THE DRIVING SHAFT AND OPPOSED TO SAID ACTUATING CLUTCH DISK, WHEREBY UPON PULLING SAID CABLE, THE BRAKE CAN BE MANUALLY RELEASED AND ALSO THE ENGAGEMENT BETWEEN SAID MAIN AND AUXILIARY CLUTCH COUPLING DISK CAN BE SIMULTANEOUSLY RELEASED.