Rotary pump

Claim 1

IN A ROTARY PUMP, A HOUSING, A FIRST SHAFT ROTATABLY MOUNTED IN SAID HOUSING, A SECOND SHAFT ECCENTRICALLY JOURNALLED IN SAID FIRST SHAFT, A TIMING PLATE AFFIXED TO THE HOUSING, MEANS FORMING A CONNECTION BETWEEN THE SECOND SHAFT AND THE TIMING PLATE TO PREVENT ROTATION OF THE SECOND SHAFT BUT PERMITTING CIRCULAR GYRATORY MOVEMENT OF THE SECOND SHAFT AS THE FIRST SHAFT IS ROTATED, A SEPARATE CASING REMOVABLY MOUNTED ON SAID HOUSING AND HAVING INLET AND OUTLET OPENINGS, SAID CASING ALSO HAVING INNER AND OUTER CONCENTRIC CYLINDER WALLS DEFINING A WORKING SPACE, PARTITION MEANS CARRIED BY THE CASING IN THE WORKING SPACE SEPARATING THE INLET OPENING FROM THE OUTLET OPENING, AND A PISTON AFFIXED TO SAID SECOND SHAFT AND MOVABLE THEREWITH, SAID PISTON HAVING A RADIALLY EXTENDING FLANGE ENGAGING THE OUTER CONCENTRIC WALL OF THE CASING, THE PISTON HAVING A CYLINDER OPERATING IN SAID WORKING SPACE TO PROVIDE TWO PUMPING CHAMBERS IN THE WORKING SPACE, SAID PISTON HAVING A SLOT STRADDLING SAID PARTITION MEANS FOR PERMITTING CIRCULAR GYRATORY MOVEMENT OF THE PISTON ABOUT THE PARTITION MEANS.