Selective drive transmission

Claim 1

A SELECTIVE DRIVE MECHANISM COMPRISING: (A) A ROTATABLY MOUNTED SHAFT; (B) FIRST, SECOND AND THIRD CLUTCH PLATES COAXIALLY MOUNTED AND KEYED TO SAID SHAFT IN AXIALLY SPACED RELATIONSHIP FOR SIMULTANEOUS ROTATION WITH SAID SHAFT, THE SECOND CLUTCH PLATE BEING INTERMEDIATE THE FIRST AND THIRD CLUTCH PLATES AND SECURED AGAINST AXIAL MOVEMENT, THE FIRST AND THIRD CLUTCH PLATES BEING MOVABLE AXIALLY OF SAID SHAFT; (C) A FIRST PULLEY COAXIALLY MOUNTED UPON SAID SHAFT AND INTERMEDIATE SAID FIRST AND SECOND CLUTCH PLATES, A SECOND PULLEY COAXIALLY MOUNTED UPON SAID SHAFT AND INTERMEDIATE SAID SECOND AND THIRD CLUTCH PLATES, SAID FIRST AND SECOND PULLEYS EACH BEING FREELY ROTATABLE ON SAID SHAFT AND HAVING CLUTCHING DISCS MOUNTED ON BOTH SIDES THEREOF AND MATABLE WITH ADJACENT CLUTCH PLATES; (D) MEANS FOR SIMULTANEOUSLY URGING SAID FIRST AND THIRD CLUTCH PLATES IN ONE AXIAL DIRECTION, PLACING SAID FIRST CLUTCH PLATE INTO ENGAGEMENT WITH ITS ASSOCIATED FIRST PULLEY CLUTCHING DISC AND PLACING THE THIRD CLUTCH PLATE OUT OF ENGAGEMENT WITH ITS ASSOCIATED SECOND PULLEY CLUTCHING DISC; AND (E) MANUALLY OPERABLE MEANS FOR MOVING SAID FIRST AND THIRD CLUTCH PLATES IN THE OPPOSITE AXIAL DIRECTION, PLACING THE THIRD CLUTCH PLATE INTO ENGAGEMENT WITH ITS ASSOCIATED SECOND PULLEY CLUTCHING DISC AND PLACING THE FIRST CLUTCH PLATE OUT OF ENGAGEMENT WITH ITS ASSOCIATED FIRST PULLEY CLUTCHING DISC.