Method of making centrifugal blower wheel

Claim 1

A METHOD FOR MAKING A CENTRIFUGAL BLOWER WHEEL COMPRISING THE STEPS OF PROVIDING A PLURALITY OF SIMILAR AIR MOVING BLADES EACH FORMED WITH A NOTCH EXTENDING INTO THE BLADE FROM ONE BLADE EDGE, EACH OF SAID NOTCHES BEING PARTIALLY CIRCULAR WITH AN ARCUATE EDGE WHICH IS SUBSTANTIALLY IN EXCESS OF 180* IN LENGTH, ASSEMBLING SAID BLADES IN LONGITUDINAL POSITIONS AND IN AN ANNULAR SERIES ABOUT A LONGITUDINAL AXIS WITH THEIR NOTCHES FORMING AN ANNULAR SERIES AND OPENING INWARDLY, PROVIDING A SHEET METAL SUPPORTING DISC HAVING A GENERALLY RADIAL INNER PORTION AND AN INTEGRAL OUTER PORTION IN THE FORM OF AN ANNULAR FLAGE WHICH PROJECTS GENERALLY AXIALLY FROM SAID INNER PORTION IN ONE DIRECTION WITH ITS FREE EDGE OF CIRCULAR FORM AND OF A DIAMETER SLIGHTLY LESS THAN THE DIAMETER BETWEEN THE INNER EDGES OF THE ASSEMBLED BLADES, POSITIONING SAID DISC WITH ITS SAID FREE EDGE IN REGISTER WITH THE NOTCHES IN THE ANNULARLY ASSEMBLED BLADES, AND AXIALLY PRESSING SAID DISC TO EFFECT RELATIVE AXIAL MOVEMENT BETWEEN SAID BLADES AND SAID DISC INNER PORTION AND TO CAUSE SAID FREE EDGE ON SAID FLANGE TO MOVE GENERALLY RADIALLY OUTWARDLY INTO THE BLADE NOTCHES, SAID PRESSING STEP INCLUDING THE STEP OF OBSTRUCTING THE OUTWARD MOVEMENT OF SAID FLANGE EDGE IN INTERBLADE REGIONS AND IN SUCH MANNER THAT AN ANNULAR PORTION OF THE FLANGE ADJACENT SAID EDGE IS CURLED TO A PARTIALLY CIRCULAR CROSS-SECTIONAL SHAPE COMPLEMENTARY TO THE EDGE-TO-EDGE DIMENSIONS OF SAID NOTCHES AND IS INHERENTLY STRESSED DURING CURLING SO AS TO BE IN PRESSURE ENGAGEMENT WITH THE EDGES OF SAID BLADE NOTCHES WHEREBY TO LOCK THE BLADES IN FIXED RELATIONSHIP TO THE DISC UPON RELEASE OF SAID AXIAL PRESSURE.

Claim 2

A METHOD FOR MAKING A CENTRIFUGAL BLOWER WHEEL COMPRISING THE STEPS OF PROVIDING A PLURALITY OF SIMILAR AIR MOVING BLADES EACH FORMED WITH A NOTCH EXTENDING INTO THE BLADE FROM ONE BLADE EDGE, EACH OF SAID NOTCHES BEING PARTIALLY CIRCULAR WITH AN ARCUATE EDGE WHICH IS SUBSTANTIALLY IN EXCESS OF 180* IN LENGTH, ASSEMBLING SAID BLADES IN LONGITUDINAL POSITIONS AND IN AN ANNULAR SERIES ABOUT A LONGITUDINAL AXIS WITH THEIR NOTCHES FORMING AN ANNULAR SERIES AND OPENING INWARDLY, PROVIDING A SHEET METAL SUPPORTING DISC HAVING A GENERALLY RADIAL INNER PORTION AND AN INTEGRAL OUTER PORTION IN THE FORM OF AN ANNULAR FLAGE WHICH PROJECTS GENERALLY AXIALLY FROM SAID INNER PORTION IN ONE DIRECTION WITH ITS FREE EDGE OF CIRCULAR FORM AND OF A DIAMETER SLIGHTLY LESS THAN THE DIAMETER BETWEEN THE INNER EDGES OF THE ASSEMBLED BLADES, POSITIONING SAID DISC WITH ITS SAID FREE EDGE IN REGISTER WITH THE NOTCHES IN THE ANNULARLY ASSEMBLED BLADES, AND AXIALLY PRESSING SAID DISC TO EFFECT RELATIVE AXIAL MOVEMENT BETWEEN SAID BLADES AND SAID DISC INNER PORTION AND TO CAUSE SAID FREE EDGE ON SAID FLANGE TO MOVE GENERALLY RADIALLY OUTWARDLY INTO THE BLADE NOTCHES, SAID PRESSING STEP INCLUDING THE STEP OF OBSTRUCTING THE OUTWARD MOVEMENT OF SAID FLANGE EDGE IN INTERBLADE REGIONS AND IN SUCH MANNER THAT AN ANNULAR PORTION OF THE FLANGE ADJACENT SAID EDGE IS CURLED TO A PARTIALLY CIRCULAR CROSS-SECTIONAL SHAPE COMPLEMENTARY TO THE EDGE-TO-EDGE DIMENSIONS OF SAID NOTCHES AND IS INHERENTLY STRESSED DURING CURLING SO AS TO BE IN PRESSURE ENGAGEMENT WITH THE EDGES OF SAID BLADE NOTCHES WHEREBY TO LOCK THE BLADES IN FIXED RELATIONSHIP TO THE DISC UPON RELEASE OF SAID AXIAL PRESSURE.