Automotive plate spring friction clutch

Claim 1

A CLUTCH OF THE CLASS DESCRIBED, COMPRISING: A REVOLUBLE DRIVING MEMBER, A REVOLUBLE DRIVEN MEMBER COAXIAL WITH SAID DRIVING MEMBER, A PRESSURE RING CONNECTED FOR ROTATION COAXIALLY WITH SAID DRIVING MEMBER, SAID PRESSURE RING BEING AXALLY DISPLACEABLE WITH RESPECT TO SAID DRIVING MEMBER, SAID DRIVEN MEMBER HAVING A PERIPHERAL PORTION INTERPOSED BETWEEN SAID DRIVING MEMBER AND SAID PRESSURE RING, MEANS DEFINING FRICTION SURFACES FOR COUPLING SAID DRIVEN MEMBER BOTH TO SAID DRIVING MEMBER AND TO SAID PRESSURE RING UPON THE APPLICATION OF AXIALLY DIRECTED PRESSURE TO SAID PRESSURE RING URGING SAID PRESSURE RING TOWARD SAID DRIVING MEMBER, A CIRCULAR RADIALLY SLOTTED PLATE SPRING MEMBER COAXIAL WITH SAID DRIVING MEMBER AND HAVING TONGUE PORTIONS WHICH EXTEND INWARDLY FROM THE PERIPHERAL PORTION THEREOF, SAID PERIPHERAL PORTION ENGAGING SAID PRESSURE RING, FULCRUM MEANS CARRIED BY SAID DRIVING MEMBER AND ENGAGING SAID PLATE SPRING MEMBER SUBSTANTIALLY AT THE ROOTS OF SAID TONGUE PORTIONS, AN AXIALLY DISPLACEABLE CIRCULAR CONTROL MEMBER COAXIAL WITH SAID DRIVING MEMBER, SAID CONTROL MEMBER BEING CENTERED AND SUPPORTED BY THE FREE ENDS OF CERTAIN REGULARLY ARRANGED ONES OF SAID TONGUE PORTIONS, SAID CONTROL MEMBER HAVING A CIRCULAR FULCRUM RIDGE FORMED ON THE