Method of blow molding a composite wheel
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United States of America Patent
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May 21, 1996
Issued Date -
N/A
app pub date -
May 26, 1994
filing date -
Apr 29, 1992
priority date (Note) -
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Abstract
A composite molded wheel assembly and method of construction wherein a separately formed injection molded tread is flow melt bonded to a blow molded rim. The tread may comprise multiple tread pieces which are spaced over a tread surface. Bond enhancing grooves and/or projections may be provided on inner surfaces of the tread pieces and/or rim. The tread pieces flow melt bond to the rim during the molding of the rim. The rim includes an axle bore containing hub, a tread support wheel box and a plurality of connecting spokes and intervening web pieces. The method includes the steps of preparing and retaining the tread within the rim forming mold, introducing a parison of rim material having a melt temperature greater than the tread material, injecting pressurized air or gas to conform the rim material to the mold and tread pieces and controlling the molding cycle temperature, pressure and time parameters to promote bonding.
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