Top-entering mixer drive

Claim 1

A DRIVE FOR A TOP-ENTRANCE MIXER TANK HAVING INTERNAL PRESSURE, SAID DRIVE COMPRISING A HOUSING HAVING A VERTICAL PORTION ADAPTED FOR MOUNTING ON THE TOP OF SAID TANK OVER SAID TOP ENTRANCE; A HOLLOW CYLINDRICAL QUILL MOUNTED FOR AXIAL ROTATION IN SAID HOUSING; DRIVE MEANS FOR DRIVING SAID QUILL ROTATIONALLY; A CYLINDRICAL TUBING MOUNTED ON THE TOP OF SAID TANK SURROUNDING SAID TOP ENTRANCE AND EXTENDING UPWARDLY IN COAXIAL ALIGNMENT WITH SAID QUILL FOR EXTENDING THE TANK PRESSURE TO A LEVEL ABOVE THE TANK TOP AND WITHIN SAID HOUSING; ANNULAR SEALING MEANS AT THE UPPER END OF SAID TUBING FOR SEALING SAID TANK PRESSURE; ADAPTOR COUPLING MEANS DISCONNECTABLY SECURED TO THE UPPER END OF SAID QUILL AND CONNECTABLE TO THE UPPER END OF A UNITARY IMPELLER SHAFT INSERTABLE DOWNWARDLY THROUGH SAID COAXIALLY ALIGNED QUILL, TUBING AND TOP ENTRANCE OF SAID TANK, SAID SHAFT WHEN FULLY INSERTED EXTENDING ABOVE SAID QUILL; AND AUXILIARY LOWER SUPPORT MEANS FOR SUPPORTING THE INSERTED SHAFT WHEN SAID ADAPTOR COUPLING MEANS IS REMOVED, SAID SEALING MEANS BEING REMOVABLE AS A UNIT, WHEN SAID ADAPTOR COUPLING MEANS IS REMOVED, BY MOVING SAID SEALING MEANS AXIALLY UPWARD WITH RESPECT TO SAID SHAFT AND OVER THE UPPER END THEREOF.