Mechanical seal assembly

Claim 1

A PUMP INCLUDING A PUMP HOUSING AND AN IMPELLER SHAFT EXTENDING THROUGH AN APERTURE IN THE PUMP HOUSING; A PAIR OF HOLLOW CASING SECTIONS MOUNTED ON THE SHAFT WITH THE CASING SECTIONS AXIALLY ALIGNED AND FACING EACH OTHER; EACH OF SAID CASING SECTIONS INCLUDING A FLANGE ON THE OUTSIDE THEREOF THAT EXTENDS CIRCUMFERENTIALLY ABOUT AND PROJECTS RADIALLY OUTWARDLY FROM THE SHAFT, AND SAID FLANGES OF THE TWO CASINGS SECTIONS HAVING COMPLEMENTING SIDES THAT ARE DIRECTLY ADJACENT AND FACE EACH OTHER; MECHANICAL SEAL STRUCTURE WITHIN THE CASING INCLUDING SPRING MEANS BIASING THE CASING SECTIONS AXIALLY APART; A WALL IN THE PUMP HOUSING SUPPORTING ONE OF THE FLANGES OF SAID CASING; A FIRST SERIES OF BORES IN SAID WALL; ELONGATED SCREW-FASTENER MEANS IN THREADED ENGAGEMENT WITH SAID ONE FLANGE CONNECTING THE TWO FLANGES OF THE CASING SECTIONS TOGETHER, AND HAVING ENDS LOOSELY RECEIVED WITHIN SAID FIRST SERIES OF BORES; SAID FASTENER MEANS HAVING A RETRACTED POSITION, WHERE THE ENDS OF THE FASTENER MEANS ARE RETRACTED FROM SAID FIRST SERIES OF BORES AND IN THREADED ENGAGEMENT WITH SAID ONE FLANGE, AND SAID FASTENER MEANS THEN OPERATING TO HOLD THE CASING SECTIONS WITH AN AXIAL SPACING INTRODUCED THEREBETWEEN AND WITH ACCOMPANYING RELAXATION OF THE SPRING MEANS BIASING SAID CASING SECTIONS APART; A SECOND SERIES OF BORES IN SAID WALL; AND SCREW-FASTENER MEANS PASSING LOOSELY THROUGH THE FLANGES EXTENDING INTO SAID SECOND SERIES OF BORES AND IN THREADED ENGAGEMENT WITH SAID WALL.