Portable pump with interchangeable drive unit

Claim 1

IN A MOTOR-PUMP ASSEMBLY IN WHICH VERTICALLY ALIGNED DRIVING AND DRIVEN SHAFTS ARE DIRECTLY COUPLED TOGETHER, A PUMP ASSEMBLY COMPRISING A CASING HAVING A PUMP CHAMBER THEREIN, A STATIONARY CORROSION RESISTANT LINING COATING THE ENTIRE INTERIOR SURFACE OF SAID CHAMBER, A ROTARY IMPELLER MOUNTED ON SAID DRIVEN SHAFT ECCENTRICALLY WITHIN SAID CHAMBER, FLEXIBLE AND NON-METALLIC RADIALLY EXTENDING VANES ON SAID IMPELLER CONTINUOUSLY ENGAGING AND MAINTAINING A SEALING CONTACT WITH SAID LINING THROUGHOUT THE ROTATION OF SAID IMPELLER WHEREBY TO EFFECT A POSITIVE DISPLACEMENT OF FLUID THROUGH SAID CHAMBER, ALIGNED FLUID INLET AND OUTLET PORTS COMMUNICATING WITH SAID CHAMBER THROUGH THE WALLS THEREOF, THE AXES OF SAID PORTS BEING HORIZONTALLY ALIGNED AND LYING IN A VERTICAL PLANE WHICH IS PARALLEL TO THE VERTICAL PLANE THROUGH THE AXIS OF SAID DRIVEN SHAFT, WHEREBY SAID VANES WILL BE FLEXED AS THEY PASS THROUGH THE AXES OF SAID PORTS THEREBY VARYING THE VOLUME OF THE SPACE LYING BETWEEN ADJACENT VANES.