Pump construction

Claim 1

IN A FLUID PUMP, A HOUSING DEFINING: (A) A CHAMBER HAVING SPACED PARALLEL END WALLS AND A CYLINDRICAL SIDE WALL, AND HAVING CIRCUMFERENTIALLY SPACED INLET AND OUTLET PORTS COMMUNICATING WITH SAID CHAMBER, (B) A SHAFT JOURNALLED FOR ROTATION IN AT LEAST ONE OF SAID END WALL ON AN AXIS RADIALLY OFFSET FROM THE AXIS OF SAID CHAMBER, (C) A ROTOR FAST ON SAID SHAFT WITHIN SAID CHAMBER, SAID ROTOR COMPRISING: (1) A HUB CONCENTRIC WITH SAID SHAFT AND EXTENDING BETWEEN SAID END WALLS, (2) A PLURALITY OF CIRCUMFERENTIALLY SPACED RADIALLY OUTWARDLY PROJECTING FLEXIBLE RESILIENT VANELIKE IMPELLER ELEMENTS FAST ON SAID HUB, (3) SAID IMPELLER ELEMENTS ALSO EXTENDING BETWEEN SAID END WALLS AND HAVING CONSTANT SWEEPING ENEGAGEMENT WITH SAID CYLINDRICAL SIDE WALL DURING ROTATION THEREOF AND BEING FLEXED REARWARDLY IN VARYING DEGREES DURING SUCH ROTATION, (4) SAID IMPELLER ELEMENTS DEFINING A PLURALITY OF CIRCUMFERENTIALLY SPACED AXIALLY EXTENDED POCKETS OF VARYING CAPACITY, (D) ONE OF SAID POCKETS DEFINING A CIRCUMFERENTIALLY AND RADIALLY ENLARGED CHANNEL, AND (E) A RELATIVELY RIGID IMPELLER ELEMENT MOUNTED AND GUIDED IN SAID CHANNEL FRO LIMITED GENERALLY RADIAL RECIPROCAL MOVEMENTS WITH RESPECT TO SAID ROTOR AND WHICH DURING ROTATION OF SAID ROTOR IS IN SUBSTANTIALLY CONTANT ENGAGEMENT WITH SAID CYLINDRICAL SIDE WALL, (F) THE TRAILING SIDE WALL OF SAID CHANNEL GUIDING SAID IMPELLER ELEMENT IN ITS GENERALLY RADIAL RECIPROCAL MOVEMENTS AND POSITIVELY RETAINING SAID IMPELLER ELEMENT WITHN SAID CHANNEL DURING SAID ROTATION.