Semi-manufacture pulley forming apparatus
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United States of America Patent
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-
Feb 27, 2007
Grant Date -
Jun 30, 2005
app pub date -
Feb 28, 2005
filing date -
Apr 25, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A pulley is made by fixing an edge of an opening of a plate by using a first upper mandrel ring installed at a lower end of a first supporting pin of a first forming device. A supporting block disposed around an upper end of a first spindle is rotated with the first spindle. An inner hub of the pulley is formed by inwardly pressing an upper surface of the plate against a first pressing roller to reduce the thickness of the plate while drawing the plate around a first mandrel ring. The plate is fixed to a second spindle of a second forming device, so the plate rotates with the second spindle. An outer hub is formed by pressing a convex bead toward the inner hub by using a fourth pressing roller and by drawing the outer hub.
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