Accessory drive mechanism

Claim 1

A VARIABLE SPEED DRIVE FOR DRIVING AN ACCESSORY OF AN INTERNAL COMBUSTION ENGINE COMPRISINGA FIXED DIAMETER V-PULLEY DRIVEN BY THE ENGINE AND A FIXED DIAMETER PULLEY CONNECTED TO SAID ACCESSORY, A DOUBLE V-PULLEY HAVING SPACED CONICAL END MEMBERS FIXED AGAINST AXIAL MOTION, AND A DOUBLE CONED MEMBER DISPOSED BETWEEN SAID END MEMBERS AND MOVABLE AXIALLY WITH RESPECT TO SAID END MEMBERS, BELTS CONNECTING THE OPPOSITE HALVES OF SAID DOUBLE V-PULLEY TO SAID FIXED DIAMETER PULLEYS, RESPECTIVELY, AN AXIALLY MOVABLE HEADER TOTATABLE WITH SAID DOUBLE V-PULLEY AND FORMING WITH ONE OF SAID END MEMBERS A CHAMBER ADAPTED TO RECEIVE VACUUM AT ONE END OF SAID DOUBLE V-PULLEY, MEANS CONNECTING SAID HEADER TO SAID DOUBLE CONED MEMBER WHEREBY SAID DOUBLE CONED MEMBER AND SAID HEADER ARE AXIALLY MOVABLE AS A UNIT, MEANS CONNECTING SAID VACUUM CHAMBER TO A SOURCE OF VARIABLE VACUUM, SPRING MEANS OPERABLE ON SAID HEADER FOR YIELDABLY OPPOSING THE EFFECT OF VACUUM IN SAID CHAMBER, PASSAGE MEANS FOR ADMITTING ATMOSPHERIC PRESSURE TO SAID CHAMBER, A FLEXIBLE SEAL DISPOSED BETWEEN SAID ONE END MEMBER AND SAID HEADER, SAID SEAL HAVING A SURFACE THEREOF SUBJECT TO VACUUM IN SAID CHAMBER AND NORMALLY EFFECTIVE TO BLOCKOFF SAID CHAMBER FROM ATMOSPHERE, SAID SURFACE BEING MOVABLE IN RESPONSE TO CENTRIFUGAL FORCE TO CONNECT SAID CHAMBER TO ATMOSPHERE THROUGH SAID PASSAGE MEANS.