Vacuum pump drive and seal arrangement

Claim 1

IN A VACUUM PUMP PROVIDED WITH A HOUSING, SAID HOUSING DEFINING AN INTERNAL CAVITY, GAS AND DISCHARGE MEANS FORMING A PART OF SAID HOUSING AND IN COMMUNICATION WITH A CAVITY THEREOF, GAS MOVING MEANS IN SAID CAVITY TO MOVE GAS THERETHROUGH FROM SAID INTAKE MEANS TO SAID DISCHARGE MEANS, SHAFT MEANS ROTATABLY DRIVING SAID GAS MOVING MEANS IN SAID CAVITY, AT LEAST ONE END PORTION OF SAID SHAFT MEANS EXPOSED EXTERNALLY OF SAID HOUSING, JOURNAL MEANS SUPPORTING SAID SHAFT MEANS IN SPACED PORTIONS OF SAID HOUSING, AND SHAFT SEALING MEANS COOPERATING WITH ONE SAID JOURNAL MEANS THROUGH WHICH SAID ONE END PORTION OF SAID SHAFT MEANS EXTENDS SAID SEALING MEANS BEING ARRANGED TO PREVENT HIGHER EXTERNAL PRESSURE LEAKAGE IN SAID CAVITY ALONG SAID SHAFT MEANS, THE IMPROVEMENT COMPRISING THE PROVISION OF LUBRICANT SUPPLY SUMP MEANS IN SAID CAVITY ADJACENT SAID SHAFT MEANS AND SAID SEALING MEANS, LUBRICANT PUMPING MEANS ON SAID SHAFT MEANS FOR OPERATION THEREWITH TO PUMP LUBRICANT AXIALLY TO SAID SEALING MEANS TO ASSIST SAID SEALING MEANS IN PREVENTING LEAKAGE INWARDLY ALONG SAID SHAFT MEANS, MEANS COMMUNICATING SAID SUMP MEANS WITH SAID PUMPING MEANS TO SUPPLY LUBRICANT TO SAID PUMPING MEANS, AND PASSAGE MEANS COMMUNICATING WITH SAID SHAFT MEANS BETWEEN SAID PUMPING MEANS AND SAID SEALING MEANS COMMUNICATING WITH THE OTHER OF SAID JOURNAL MEANS SPACED FROM SAID ONE JOURNAL MEANS TO DELIVER LUBRICANT TO SAID OTHER JOURNAL MEANS UNDER PRESSURE DEVELOPED BY SAID PUMPING MEANS.