Magnetic particle clutch

Claim 1

A MAGENTIC COUPLING DIVICE COMPRISING A PAIR OF MAGNETIC RELATIVELY ROTATABLE COUPLING MEMBERS, ONE MEMBER HAVING A PLURALITY OF CONCENTRIC CYLINDRICAL SURFACES, THE OTHER MEMBER FORMING A SUBSTANTIALLY SEALED CHAMBER ENCLOSING SAID ONE MEMBER AND HAVING INNER AND OUTER CONCENTRIC MAGNETIC MEMBERS AND A NON-MAGNETIC RING SEPARATING THE INNER AND OUTER MEMBERS, SAID OUTER MEMBER HAVING A MAGNETIC SURFACE CONCENTRIC WITH AND OF GREATER DIAMETER THAN SAID CYLINDRICAL SURFACES OF SAID ONE MEMBER, SAID INNER MEMBER HAVING A MAGNETIC SURFACE CONCENTRIC WITH AND OF LESSER DIAMETER THAN SAID CYLINDRICAL SURFACES OF SAID ONE MEMBER, SAID SURFACES OF BOTH COUPLING MEMBERS BEING SPACED TO DEFINE A PLURALITY OF CONCENTRIC CYLINDRICAL GAPS, MAGNETIC PARTICLES IN SAID GAPS, AND A STATIONARY MAGNETIZING ELEMENT HAVING CONCENTRIC ANNULAR OPPOSING POLES, THE POLE OF GREATER DIAMETER AND AT LEAST A PORTION OF SAID OUTER MEMBER BEING RADIALLY SPACED FROM EACH OTHER IN TELESCOPED CONCENTRIC RELATION AND THE POLE OF LESSER DIAMETER BEING ADJACENT TO BUT SPACED FROM SAID INNER MEMBER TO FORM A MAGNETIC CIRCUIT INCLUDING SAID POLES, SAID INNER AND OUTER MAGNETIC MEMBERS, AND SAID GAPS WITH THE MAGNETIC PARTICLES THEREIN, SAID MAGNETIC CIRCUIT BEING ADAPTED TO DIRECTE FLUX SUBSTANTIALLY RADIALLY THROUGH SAID GAPS.