Rotor driving mechanism

Claim 1

A ROTOR HEAD COMPRISING A FIXED HOLLOW MAST, ADAPTED TO BE SUPPORTED BY A FUSELAGE, A SHAFT, A UNIVERSAL JOINT INTERMEDIATE THE ENDS OF SAID SHAFT CONNECTING SAID SHAFT AND MAST AND HOLDING SAID SHAFT AGAINST LONGITUDINAL MOVEMENT AND AXIALLY ROTATION AND SUPPORTING SAID SHAFT FOR UNIVERSAL INCLINATION, A ROTOR HUB ROTATABLY SUPPORTED ON AND ADJACENT ONE END OF SAID SHAFT, BEARING MEANS HOLDING SAID HUB AGAINST AXIAL, TILTING, AND TRANSVERSE MOVEMENT WITH RESPECT TO SAID SHAFT AND ROTATABLY CONNECTING SAID HUB WITH SAID SHAFT FOR ROTATION ABOUT THE AXIS OF SAID SHAFT AND UNIVERSALLY INCLINABLE WITH SAID SHAFT, A REDUCTION GEAR HAVING A FIXED ANNULAR CASING AND SUPPORT FIXED WITH RESPECT TO SAID MAST AND COMPRISING AN ANNULAR SUN AND RING GEAR AND PLANET GEARS THEREBETWEEN SUBSTANTIALLY CONCENTRIC WITH AND SURROUNDING SAID MAST AND SHAFT, MEANS FOR DRIVING SIAD SUN AND RING GEARS IN OPPOSITE DIRECTIONS AROUND SAID MAST, A PLANET GEAR CAGE SUPPORTING SAID PLANET GEARS, UNIVERSAL JOINT MEANS HAVING A CENTER COMMOM WITH SAID UNIVERSAL JOINT FROM SAID PLANET CAGE AXIS, ARMS PIVOTED ON SAID HUB FROM SAID PLANET CAGE AXIS, ARMS PIVOTED ON SAID HUB AND EXTENDING OUTWARDLY FROM SAID ROTOR HUB AXIS, AND A UNIVERSAL JOINT CONNECTING THE OUTER ENDS OF EACH PAIR OF SAID ARMS FOR DRIVING SAID ROTOR HUB, SAID SHAFT EXTENDING AXIALLY THROUGH SAID HOLLOW MAST, SAID ANNULAR SUN GEAR AND REDUCTION GEAR AND SUPPORTING SAID ROTOR ADJACENT ONE SIDE OF SAID REDUCTION GEAR, MEANS ON THE OTHER SIDE OF SAID REDUCTION GEAR AND ADJACENT THE OTHER END OF SAID SHAFT FOR MOVING SAID SHAFT TRANSVERSELY ABOUT ITS UNIVERSAL JOINT WITHIN SAID HOLLOW MAST AND REDUCTION GEAR FOR BODILY TILTING SAID ROTOR.