Mechanical seal for fluid transfer means

Claim 1

A FLUID TIGHT MECHANICAL SEALING STRUCTURE COMPRISING, IN COMBINATION: (A) A ROTARY SHAFT JOURNALED TO ROTATE IN A HOUSING, (B) SAID HOUSING DEFINING A FLUID CHAMBER CONTAINING FLUID TO BE SEALED; (C) AN ANNULAR SEAL MEMBER JOURNALED FOR ROTATION WITH SAID SHAFT AND HAVING A FIRST SEALING FACE; (D) COOPERATING CLOSURE MEANS COMPRISING AN END CAP CLOSING OFF A RECESS PORTION OF THE HOUSING THROUGH WHICH SAID SHAFT EXTENDS; (E) SAID CLOSURE MEANS DEFINING A STATIONARY AND ANNULAR SEALING FACE AT AN EDGE PORTION THEREOF AND IN MUTUAL ENGAGEMENT WITH SAID FIRST SEALING FACE TO FORM A PRIMARY SEAL; AND (F) A FLEXIBLE AND RESILIENT DIAPHARGM MEMBER TRANSVERSE TO SHAFT EXTENDING FROM SAID SEAL MEMBER HAVING AN EDGE PORTION MAINTAINING A CLOSE RUNNING FIT AND FORMING THEREWITH A SECONDARY SEAL, AND DE FINING WITH SAID CLOSURE MEANS A LUBRICANT CHAMBER, SAID DIAPHRAGM BEING DIRECTLY EXPOSED TO SAID FLUID AND SUFFICIENTLY RESPONSIVE TO INCREASED PRESSURE TO URGE LUBRICANT FROM SAID LUBRICANT CHAMBER TOWARD SAID PRIMARY SEAL.