Segmented mold for blower wheels

Claim 2

An adjustable, multiple-part mold for the injection molding of bladed blower wheels of varying blade lengths, comprising a base part defining one end surface of such blower wheel, an intermediate mold section comprising a stacked series of intermediate parts, each said intermediate part being of limited axial length and including an independent inner portion having means defining an annular series of blade-forming slots open and spaced along the periphery thereof and an independent encircling outer portion forming a cylindrical outer closure wall for said slots, means joining said intermediate parts with said blade forming slots in alignment, a mold-closing end part defining a cavity with said intermediate section for forming an end wall of such blower wheel, the number of said intermediate parts being selectable to produce blower wheels having blades of differing lengths.

Claim 3

The mold of claim 1 in which said base part includes a generally cylindrical mandrel extending coaxially of said intermediate section and terminating adjacent said end part, said intermediate section being mounted on said mandrel.

Claim 4

The mold of claim 2 in which said mandrel defines with said end part a cavity forming an axial hub of such blower wheel.

Claim 5

The mold of claim 3 comprising a pin in said mandrel at said hub cavity forming a shaft opening in the blower wheel hub.

Claim 6

A multiple-part mold for molding plastic blower wheels comprising a mandrel base part defining the axially open end of said wheel, a first intermediate part including an independent inner portion mounted on said mandrel base part and defining a plurality of peripherally open and spaced blade slots, and an independent outer annular portion forming a cylindrical closure wall to said blade slots and defining with said base part the blade reinforcing ring cavity, at least one additional said intermediate part of limited axial length having an independent inner portion mounted on said base part defining additional said peripherally open and spaced blade slots axially aligned with the slots in said first intermediate portion and further having an independent annular outer portion forming a cylindrical closure wall to said slots, a mold-closing end part defining a cavity with the adjacent said intermediate part for forming the end wall of such wheel, and means mounting said outer portions on said end part.

Claim 7

A multiple-part mold for molding plastic blower wheels comprising a mandrel base part defining the axially open end of said wheel, a first intermediate part including an independent inner portion mounted on said mandrel base part and defining a plurality of peripherally open and spaced blade slots, and an independent outer annular portion forming a cylindrical closure wall to said blade slots and defining with said base part the blade reinforcing ring cavity, at least one additional said intermediate part of limited axial length having an independent inner portion mounted on said base part defining additional said peripherally open and spaced blade slots axially aligned with the slots in said first intermediate portion and further having an independent annular outer portion forming a cylindrical closure wall to said slots, a mold-closing end part defining a cavity with the adjacent said intermediate part for forming the end wall of such wheel, and means mounting said outer portions on said end part.

Claim 8

A multiple-part mold for molding plastic blower wheels comprising a base part defining the axially open end of said wheel and having a central axially extending mandrel, a first intermediate part including an independent inner portion mounted on said mandrel and defining a plurality of peripherally open and spaced blade slots, and an independent outer annular portion forming a cylindrical closure wall to said blade slots and defining with said base part the blade reinforcing ring cavity, at least one additional said intermediate part of limited axial length having an independent inner portion mounted on said mandrel defining additional said peripherally open and spaced blade slots axially aligned witH the slots in said first intermediate portion and further having an independent annular outer portion forming a cylindrical closure wall to said slots, a mold-closing end part defining a cavity with said mandrel and with the adjacent said intermediate part for forming the end wall of such wheel, and means connecting said inner portions to said base part and said outer portions to said end part.

Claim 9

A multiple-part mold for molding plastic blower wheels comprising a base part defining the axially open end of said wheel and having a central axially extending mandrel, a first intermediate part including an independent inner portion mounted on said mandrel and defining a plurality of peripherally open and spaced blade slots, and an independent outer annular portion forming a cylindrical closure wall to said blade slots and defining with said base part the blade reinforcing ring cavity, at least one additional said intermediate part of limited axial length having an independent inner portion mounted on said mandrel defining additional said peripherally open and spaced blade slots axially aligned witH the slots in said first intermediate portion and further having an independent annular outer portion forming a cylindrical closure wall to said slots, a mold-closing end part defining a cavity with said mandrel and with the adjacent said intermediate part for forming the end wall of such wheel, and means connecting said inner portions to said base part and said outer portions to said end part.