bursak

Claim 1

A ROTARY PUMP COMPRISING: A GEAR HOUSING HAVING FRONT AND REAR WALLS, A PUMP CASING PROVIDED WITH A PAIR OF INTERSECTING POCKETS AND INLET AND OUTLET PORTS COMMUNICATING WITH SAID POCKETS, SAID PUMP CASING HAVING UNINTERRUPTED INTERIOR SURFACES AND INCLUDING AN END WALL RELEASABLY SECURED TO THE FRONT WALL OF SAID GEAR HOUSING, SAID END WALL PROVIDED WITH A PAIR OF SPACED OPENINGS AND A PAIR OF COUNTERBORES IN ITS EXTERIOR SURFACE CONCENTRIC WITH SAID OPENINGS TO DEFINE ANNULAR SHOULDER PORTIONS, A CLOSURE PLATE RELEASABLY SECURED TO SAID PUMP CASING TO DEFINE A PUMP CHAMBER WITH SAID POCKETS, A PAIR OF SPACED, PARALLEL SHAFTS JOURNALED FOR ROTATION IN SAID GEAR HOUSING WALLS AND ALIGNED WITH SAID OPENINGS, EACH OF SAID SHAFTS HAVING A PORTION WHICH PROJECTS INTO SAID PUMP CHAMBER THROUGH ONE OF SAID OPENINGS, INTERMESHING GEARING ON SAID SHAFTS WITHIN SAID GEAR HOUSING, A PAIR OF IMPELLERS REMOVABLY MOUNTED ON SAID SHAFTS AND EACH WITHIN ONE OF SAID POCKETS, EACH OF SAID IMPELLERS HAVING A CENTRAL AXIAL BORE WHICH TERMINATES SHORT OF ONE FACE OF SAID IMPELLER TO DEFINE AN END SEAL WALL AND A SLEEVE PORTION EXTENDING FROM AN OPPOSITE FACE OF SAID IMPELLER PROVIDING A CONTINUATION OF SAID AXIAL BORE, SAID CENTRAL AXIAL BORES RECEIVING THE PROJECTING PORTIONS OF SAID SHAFTS AND SAID SLEEVE PORTIONS EXTENDING ALONG SAID SHAFTS THROUGH SAID OPENINGS, AN ANNULAR SEALING RING WITHIN EACH OF SAID COUNTERBORES ABOUT A RESPECTIVE SLEEVE PORTION AND SEALING THE PERIPHERIES OF SAID SLEEVE PORTION FROM SAID PUMP CHAMBER, AN ANNULAR RETAINING MEMBER RECEIVED WITHIN EACH OF SAID COUNTERBORES AGAINST SAID SEALING RINGS, AND BIASING MEANS ANCHORED ON THE FRONT WALL OF SAID GEAR HOUSING AND URGING SAID RETAINING MEMBERS AXIALLY AGAINST SAID SEALING RINGS TO SEAT SAID SEALING RINGS AGAINST SAID SHOULDER PORTIONS.