Pump

Claim 1

AN IMPELLER FOR A CENTRIFUGAL PUMP COMPRISING A SUBSTANTIALLY CIRCULAR SHROUD ADAPTED TO BE ROTATED ABOUT ITS AXIS AND A CONTINUOUS VANE EXTENDING ACROSS ONE SIDE OF THE SHROUD FORMING ONE END OF THE IMPELLER WHICH VANE, WHEN VIEWING SAID ONE END OF THE IMPELLER, INCLUDES ONE SECTION THAT STARTS AT A MARGINAL PORTION OF THE SHROUD AND THENCE IN OUTLINE ARCUATELY CURVES IN ONE DIRECTION PROGRESSING TOWARD THE AXIS OF THE IMPELLER, AND ANOTHER SECTION JOINED TO SAID ONE SECTION AT THE AXIS OF THE IMPELLER WHICH IN OUTLINE ARCUATELY CURVES IN THE OPPOSITE DIRECTION PROGRESSING FROM THE AXIS OF THE IMPELLER TOWARD ANOTHER MARGINAL PORTION OF THE SHROUD WHICH IS SPACED CIRCUMFERENTIALLY ON THE THROUD FROM SAID FIRST-MENTIONED MARGINAL PORTION, THAT SIDE OF EACH VANE SECTION WHICH IS THE CONVEX SIDE, ON VIEWING SAID ONE END OF THE IMPELLER, FORMING THE LEAD SIDE OF THE VANE SECTION ON OPERATION OF THE IMPELLER WHICH MOVES INTO FLUID TO WORK THEREON, AND SUCH CONVEX SIDE BEING DEFINED BY A WALL THAT CURVES WHEN VIEWING THE IMPELLER FROM ITS SAID ONE END TO PRODUCE THE ARCUATE OUTLINE FOR THE VANE SECTION, BUT WHICH IS SUBSTANTIALLY STRAIGHT AND LIES AT A STEEP ANGLE RELATIVE TO THE SHROUD VIEWING CROSS SECTIONS OF THE IMPELLER TAKEN THROUGH THE AXIS OF THE IMPELLER, THAT SIDE OF EACH VANE SECTION WHICH IS THE CONCAVE SIDE, ON VIEWING SAID ONE END OF THE IMPELLER, FORMING THE TRAILING SIDE OF THE VANE SECTION ON OPERATION OF THE IMPELLER, AND SUCH CONCAVE SIDE BEING DEFINED BY A WALL THAT CURVES WHEN VIEWING THE IMPELLER FROM ITS SAID ONE END TO PRODUCE THE ARCUATE OUTLINE FOR THE VANE SECTION, SAID WALL ALSO CURVING CONCAVELY IN CROSS-SECTIONAL VIEWS OF THE IMPELLER TAKEN THROUGH THE AXIS OF THE IMPELLER, AND FURTHER CURVING IN A CONCAVE CONTINUOUS SWEEP PROGRESSING REARWARDLY OF THE VANE SECTION FROM ADJACENT THE LEAD SIDE OF THE IMPELLER IN A CROSS-SECTIONAL VIEW OF THE IMPELLER TAKEN ALONG A LINE THAT CURVES AROUND THE AXIS OF THE IMPELLER.