Multi-position vacuum motor

Claim 1

IN A VACUUM MOTOR CONTROL SYSTEM: A CUP-SHAPED HOUSING HAVING A GENERALLY CLOSED BOTTOM END WALL AND AN INTERNAL CHAMBER OPENING OUTWARDLY OF THE OPEN END OF SAID CUP-SHAPED HOUSING; A MOVABLE WALL IN SAID INTERNAL CHAMBER, THE SIDES OF SAID MOVABLE WALL HAVING A PREDETERMINED CLEARANCE WITH RESPECT TO THE SIDEWALLS OF SAID INTERNAL CHAMBER; A CURTAIN DIAPHRAGM OVERLYING SAID MOVABLE WALL WITH A ROLLING U-SHAPED PORTION EXTENDING INTO SAID PREDETERMINED CLEARANCE TO ROLL BETWEEN THE SIDEWALLS OF SAID CHAMBER AND THE SURFACE OF SAID MOVABLE WALL DURING MOVEMENT OF SAID MOVABLE WALL, AND ITS OUTER EDGE SEALINGLY FIXED TO THE SIDEWALLS OF SAID HOUSING; A DRIVEN SHAFT EXTENDING THROUGH SAID END WALL OF SAID HOUSING AND OPERATIVELY CONNECTED TO SAID MOVABLE WALL; MEANS BIASING SAID MOVABLE WALL TO A NORMAL POSITION ADJACENT THE OPEN END OF SAID INTERNAL CHAMBER; A FIRST VACUUM VALVE PORT IN THE END WALL OF SAID INTERNAL CHAMBER ADJACENT SAID SHAFT; VALVE SHUT-OFF MEANS CARRIED BY SAID SHAFT FOR CLOSING SAID VACUUM VALVE PORT WHEN SAID MOVABLE WALL MOVES FROM ITS NORMAL POSITION INWARDLY TO A FIRST ACTUATED POSITION; ABUTMENT MEANS LIMITING INWARD MOVEMENT OF SAID MOVABLE WALL TO A SECOND ACTUATED POSITION WHEREIN SAID MOVABLE WALL IS SPACED INWARDLY FROM SAID FIRST ACTUATED POSITION; A SECOND VACUUM PORT OPENING INTO SAID INTERNAL CHAMBER AND WHICH IS NOT CLOSED OFF BY SAID MOVABLE WALL; SAID VALVE SHUT-OFF MEANS REMAINING CLOSED AS SAID MOVABLE WALL MOVES FROM SAID FIRST ACTUATED POSITION TO SAID SECOND ACTUATED POSITION; AND VALVE MEANS FOR SELECTIVELY APPLYING VACUUM TO RESPONSIVE FIRST AND SECOND VALVE PORTS.