Vane pumps

Claim 1

A ROTARY PUMP, COMPRISING AN OUTER CASING HAVING A LONGITUDINAL AXIS AND HAVING AN INNER SPACE WITH TRANSVERSE END WALLS AND A PERIPHERAL WALL HAVING AT LEAST A PART-CYLINDRICAL PORTION, A SHAFT MEANS MOUNTING SAID SHAFT ROTATABLY IN SAID CASING WITH SAID SHAFT EXTENDING AXIALLY, THE AXES OF SAID SHAFT AND SAID PART-CYLINDRICAL PORTION BEING CO-INCIDENT, A CYLINDRICAL ROTOR, MEANS MOUNTING SAID ROTOR IN SAID CASING SO THAT ITS AXIS IS OFFSET WITH RESPECT TO AND PARALLEL TO SAID LONGITUDINAL AXIS, SAID SHAFT EXTENDING THROUGH SAID ROTOR, SAID ROTOR HAVING AXIAL SLOTS EXTENDING IN THE DIRECTION OF LENGTH THEREOF AND EQUALLY CIRCUMFERENTIALLY SPACED, AN ELASTOMER HUB FIXEDLY MOUNTED ON SAID SHAFT AND OF GENERALLY CYLINDRICAL SHAPE, SAID HUB HAVING UNITARY, EQUALLY CIRCUMFERENTIALY SPACED, INTEGRAL, CIRCUMFERENTIALLY FLEXIBLE AND RESILIENT PROJECTIONS EXTENDING RADIALLY THEREFROM IN RESPECTIVE GENERAL CORRESPONDENCE WITH RESPECTIVE ROTOR SLOTS AND LOCATED RADIALLY INWARDLY OF SAID ROTOR, RIGID VANES RESPECTIVELY SECURED TO THE RESPECTIVE HUB PROJECTIONS, SAID VANES EXTENDING GENERALLY RADIALLY FROM SAID HUB AND ALSO EXTENDING LONGITUDINALLY, SAID VANES BEING OF LENGTH CORRESPONDING TO THE AXIAL LENGTH OF SAID ROTOR SLOTS, SAID HUB AND SAID PROJECTIONS BEING OF GENERALLY THE SAME LENGTH AS SAID VANES, SAID VANES RESPECTIVELY EXTENDING SLIDABLY THROUGH THE RESPECTIVE ROTOR SLOTS, THE TIPS OF SAID VANES BEING LOCATED IN A CYLINDER OF REVOLUTION WHOSE AXIS IS SAID LONGITUDINAL AXIS, SAID PART-CYLINDRICAL PERIPHERAL WALL PORTION HAVING A RADIUS SUCH AS TO RECEIVE THE TIPS OF THE ROTATING VANES IN CLOSE, GENERALLY UNIFORMLY SPACED RELATIONSHIP TO SAID PART-CYLINDRICAL PERIPHERAL WALL PORTION.