Hydraulic machines

Claim 1

IN A ROTARY PUMP WHICH IS CAPABLE OF OPERATING AS A MOTOR WHEN SUPPLIED WITH FLUID UNDER PRESSURE, IN COMBINATION, A HOUSING HAVING AN INLET AND AN OUTLET; AT LEAST ONE ROTARY PUMP MEMBER THEREIN; A PAIR OF STUB SHAFTS FIXED TO AND EXTENDING COAXIALLY FROM THE OPPOSITE SIDES OF THE MEMBER, RESPECTIVELY; AT LEAST ONE MOVABLE BEARING WALL LOCATED IN SAID HOUSING ON ONE SIDE OF SAID MEMBER AND FORMED WITH AT LEAST ONE BEARING OPENING WHICH RECEIVES THE STUB SHAFT ON THE SIDE OF SAID MEMBER ON WHICH SAID BEARING WALL IS LOCATED, SAID MEMBER HAVING ADJACENT SAID LATTER SHAFT A CONTINUOUS ANNULAR SURFACE PORTION CONFRONTING SAID WALL AND SAID WALL BEING FORMED AT A PORTION SPACED FROM SAID INLET AND OUTLET WITH A PASSAGE SPACED FROM SAID BEARING OPENING AND EXTENDING FROM A FACE PORTION OF SAID WALL WHICH IS CONFRONTED BY SAID ANNULAR SURFACE PORTION OF AND DIRECTED TOWARD SAID MEMBER, AT A PART OF SAID FACE WHICH DOES NOT COMMUNICATE WITH SAID INLET AND OUTLET, TO THE OPPOSITE FACE OF SAID WALL WHICH IS DIRECTED AWAY FROM SAID MEMBER, SAID HOUSING HAVING A WALL ADJACENT TO BUT SPACED FROM SAID OPPOSITE FACE OF SAID BEARING WALL; AND ENDLESS SEALING RING MEANS LOCATED BETWEEN AND ENGAGING SAID HOUSING WALL AND BEARING WALL AT SAID OPPOSITE FACE OF THE LATTER, SURROUNDING THE END OF SAID PASSAGE AT SAID OPPOSITE FACE OF SAID BEARING WALL, AND FORMING IN SAID HOUSING A CLOSED CHAMBER DEFINED BY SAID ENDLESS SEALING RING MEANS AND THE SURFACE PORTIONS OF SAID HOUSING WALL AND SAID OPPOSITE FACE OF SAID BEARING WALL WHICH ARE RESPECTIVELY SURROUNDED BY SAID ENDLESS SEALING RING MEANS, SAID CLOSED CHAMBER COMMUNICATING ONLY WITH SAID PASSAGE SO THAT THE FLUID LOCATED BETWEEN SAID MEMBER AND SAID PART OF SAID FACE OF SAID BEARING WALL DIRECTED TOWARD SAID MEMBER CAN FLOW THROUGH SAID PASSAGE TO SAID CLOSED CHAMBER TO PROVIDE IN THE LATTER FLUID UNDER PRESSURE ACTING IN OPPOSITION TO THE PRESSURE OF THE FLUID BETWEEN SAID MEMBER AND SAID PART OF SAID FACE OF SAID BEARING WALL DIRECTED TOWARD SAID MEMBER.