Magnetic clutch

Claim 1

A MAGNETIC CLUTCH COMPRISING A DRIVE SHAFT, A ROTOR MOUNTED ON SAID SHAFT AND SECURED TO TURN THEREWITH, AN ARMATURE MOUNTED FOR FREE ROTATION ON SAID SHAFT, A STATIONARY COIL SHELL COAXIALLY MOUNTED RELATIVE TO SAID SHAFT, A COIL CONTAINED WITHIN SAID SHELL WHEREBY THE FLUX DENSITY IS INCREASED IN THE SHELL AND DECREASED IN THE ARMATURE WHEN SAID COIL IS ENERGIZED, AND A PERMANENT MAGNET WITHIN SAID ROTOR, SAID ROTOR BEING COMPRISED OF INNER AND OUTER ROTOR MEMBERS EACH CONTACTING A DIFFERENT POLE SURFACE OF SAID MAGNET, EACH SAID MEMBER HAVING A ROTOR POLE FACE ON A SIDE THEREOF ADJACENT SAID ARMATURE, SAID ARMATURE INCLUDING AN ARMATURE DISC, SPRING MEANS NORMALLY URGINGH SAID DISC AWAY FROM SAID ROTOR, THE POLE FACE OF WHICH DISC IS OPPOSITE AND NORMALLY ENGAGED WITH SAID ROTOR POLE FACES, MEANS PROVIDING AN AIR GAP BETWEEN AN OUTER CIRCULAR PORTION OF SAID SHELL AND SAID OUTER ROTOR MEMBER, AND MEANS PROVIDING AN AIR GAP BETWEEN AN INNER CIRCULAR PORTION OF SAID SHELL AND SAID INNER ROTOR MEMBER, BOTH SAID AIR GAPS BEING OF LENGTH AND WIDTH PROPORTIONS TO RESULT IN THE LARGEST PORTION OF THE MAGNETIC FLUX FROM THE PERMANENT MAGNET TO BE CONDUCTED THROUGH THE ROTOR POLE FACES AND ARMATURE DISC, AND THE LESSER PORTION THROUGH THE COIL SHELL, AND WHEREBY HIGH MAGNETIC INDUCTANCE IS RETAINED IN THE PERMANENT MAGNET.