Method for manufacturing double-gear trains
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United States of America Patent
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-
Mar 29, 1983
Grant Date -
N/A
app pub date -
Oct 21, 1980
filing date -
Dec 24, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for manufacturing double-gear trains in which gears of double-gear trains are molded already in engagement with one another. Upper and lower gear molding cavities are formed in upper and lower molds between which is sandwiched an intermediate mold. Apertures are formed in the intermediate mold for molding shafts which join gear pairs. Thin wall dividing portions are provided between adjacent gears which are molded in engagement with one another. A molten resin introducing cavity is formed between an outer mold and the upper mold. Coupling pieces may also be molded simultaneously with the formation of the double-gear train.
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