Electromagnetically operated clutch-brake

Claim 1

IN AN ELECTROMAGNETICALLY OPERATED CLUTCH-BRAKE UNIT, A CYLINDRICAL CASING MEMBER OF MAGNETIC MATERIAL HAVING A RADIAL END FACE COMPRISING A BRAKE SURFACE, AN ANNULAR RECESS IN SAID FACE AND AN ELECTROMAGNETIC WINDING IN SAID RECESS, A CUP-SHAPED CASING MEMBER OF NONMAGNETIC MATERIAL COAXIAL WITH SAID CYLINDRICAL CASING MEMBER AND HAVING ITS OPEN END CONNECTED THERETO ADJACENT TO SAID RADIAL END FACE WHEREBY THE INTERIOR OF SAID CUP-SHAPED MEMBER AND SAID RADIAL END FACE FORM A GENERALLY CYLINDRICAL CHAMBER, A SHAFT EXTENDING AXIALLY THROUGH SAID CASING MEMBERS AND HAVING BEARING IN SAID CYLINDRICAL CASING MEMBER, A ROTOR MEMBER HAVING BEARING ON SAID SHAFT, A BEARING BETWEEN SAID ROTOR MEMBER AND SAID CUP-SHAPED CASING MEMBER, SAID ROTOR MEMBER HAVING A RADIALLY ENLARGED PORTION IN SAID CHAMBER COMPRISING A DRIVING CLUTCH MEMBER, CAN ANNULAR CLUTCH-BRAKE MEMBER IN SAID CHAMBER BETWEEN THE CLUTCH MEMBER AND SAID RADIAL FACE AND HAVING A CIRCUMFERENTIAL PORTION FOR FRICTIONAL DRIVING ENGAGEMENT WITH SAID DRIVING CLUTCH MEMBER, SAID CASING MEMBER END FACE AND THE ADJACENT FACE OF SAID CLUTCH-BRAKE MEMBER HAVING BRAKING ENGAGEMENT WHEN SAID ELECTROMAGNETIC WINDING IS ENERGIZED, A FLEXIBLE RELATIVELY FLAT ANNULAR DIAPHRAGM HAVING ITS OUTER MARGINAL PORTION FIXED TO SAID CLUTCH-BRAKE MEMBER AND ITS INNER MARGINAL PORTION FIXED TO SAID SHAFT WHEREBY SAID CLUTCH-BRAKE MEMBER HAS LIMITED AXIAL MOVEMENT RELATIVE TO SAID SHAFT BY FLEXURE OF SAID DIAPHRAGM BUT IS FIXED BY SAID DIAPHRAGM AGAINST RELATIVE ROTATIVE MOVELMENT RELATIVE TO SAID SHAFT, AND A COMPRESSION COIL SPRING ACTING BETWEEN SAID CASING AND SAID CLUTCH-BRAKE MEMBER URGING THE LATTER TO CLUTCHING POSITION WITH RESPECT TO SAID DRIVING CLUTCH MEMBER.