Magnetic coil clutch

Claim 1

A FRICTION COUPLING HAVING, IN COMBINATION, TWO MEMBERS DISPOSED END TO END AND MOUNTED FOR RELATIVE TURNING ABOUT A COMMON AXIS, ANNULAR FRICTION SURFACES ON THE PERIPHERIES OF THE RESPECTIVE MEMBERS, MEANS COACTING WITH SAID SURFACES TO FORM A MAIN FRICTION CLUTCH ADAPTED WHEN ACTIVATED TO COUPLE SAID MEMBERS FRICTIONALLY AND INCLUDING A HELICAL COIL OF MAGNETIC MATERIAL TELESCOPED WITH AT LEAST ONE OF SAID SURFACES, MEANS ANCHORING ONE END TURN OF SAID COIL TO ONE OF SAID MEMBERS, THE TURN AT THE OPPOSITE END OF SAID COIL BEING FREE AND CONSTITUTING A MAGNET ARMATURE, A MAGNETIC PILOT FRICTION CLUTCH OPERABLE WHEN ACTIVATED TO DERIVE A TORQUE FROM THE RELATIVE TURNING OF SAID MEMBERS AND APPLY SUCH TORQUE TO SAID ARMATURE, SAID PILOT CLUTCH PROVIDING A TOROIDAL FLUX PATH THREADING INTO AND OUT OF SAID ARMATURE AND INCLUDING A RADIAL FLANGE ON THE OTHER OF SAID MEMBERS PROVIDING AN AXIAL FACE DISPOSED OPPOSITE AND OVERLAPPING THE INNER PORTION OF THE END FACE OF SAID ARMATURE, A MAGNETIC RING ENCIRCLING SAID FLANGE AND PROVIDING AN OUTER FACE OVERLAPPING THE OUTER PORTION OF SAID ARMATURE FACE, AND A NONMAGMETIC MEANS RIGIDLY JOINING THE ADJACENT EDGES OF SAID RING AND SAID FLANGE, AND TORQUE TRANSMITTING MEANS ON SAID RING ADAPTED TO BE COUPLED TO A ROTARY PART FOR EFFECTING THE TRANSMISSION OF ROTARY POWER RADIALLY BETWEEN SAID RING, SAID NONMAGNETIC MEANS, SAID FLANGE AND SAID MAIN CLUTCH.