Magnetic particle clutch

Claim 1

A MAGNETIC COUPLING COMPRISING A PAIR OC CONCENTRICALLY RELATED, INNER AND OUTER, CYLINDRICAL COUPLING MEMBERS COMPRISING MAGNETIC MATERIAL AND MOUNTED FOR ROTATION RELATIVE TO THE OTHER AND HAVING RADIALLY OUTWARDLY AND INWARDLY FACING ADJACENT CYLINDRICAL SURFACES RESPECTIVELY, SAID SURFACES BEING RADIALLY OPPOSITE AND CLOSELY SPACED FROM EACH OTHER TO FORM AN AXIALLY EXTENDING INNER CYLINDRICAL AIR GAP THEREBETWEEN, MAGNETIC PARTICLES IN SAID AIR GAP, SEALING MEANS HAVING SEALING CONTACT WITH SAID COUPLING MEMBERS FOR CONFINING SAID MAGNETIC PARTICLES IN A SPACE WITHIN SAID RADIALLY INWARDLY FACING CYLINDRICAL SURFACE OF SAID OUTER COUPLING MEMBER AND CONTAINING SAID INNER COUPLING MEMBER AND SAID AIR GAP, A MAGNETIZING FIELD STRUCTURE SUPPORTED ADJACENT SAID OUTER CYLINDRICAL COUPLING ELEMENT, SAID MAGNETIZING STRUCTURE COMPRISING A MAGNETIC CORE ENCIRCLING SAID OUTER COUPLING MEMBER AND COMPRISING FLAT, THIN, GENERALLY U-SHAPED LAMINATIONS OF MAGNETIC MATERIAL, EACH HAVING A PAIR OF LATERALLY SPACED APART LEG PORTIONS JOINED TOGETHER AT ONE END BY AN INTERCONNECTING PORTION AND EACH LYING SUBSTANTIALLY IN A RADIALLY DIRECTED PLANE CONTAINING THE AXIS OF SAID COUPLING MEMBERS AND ARRANGED IN A PLURALITY OF CIRCUMFERENTIALLY ALIGNED AND SPACED SETS OF LAMINATIONS STACKED TOGETHER IN SUPERPOSED RELATIONSHIP, SAID SETS EACH HAVING A MAGNETICALLY INTERCONNECTED PAIR OF