System and method for molding plastic gear suppressing...

Plastic article or earthenware shaping or treating: apparatus – Shaping surface including means to release or remove product... – By movable ejector means entering mold cavity

Reexamination Certificate

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C425S175000, C425S554000

Reexamination Certificate

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07086850

ABSTRACT:
A gear molding method for molding a plurality of plastic gears having a different number of ribs without changing costly gates uses a mold having a prescribed gear shape including a prescribed number of grooves substantially radially arranged in the mold. A prescribed number of gates is provided for pouring molten plastic into the mold. When a plastic gear is molded and separated from the mold, a prescribed number of grooves are additionally cut at a middle angular position between each of the pair of neighboring grooves without changing the gates. Then, another gear having increased number of ribs is molded using the same gates.

REFERENCES:
patent: 4050283 (1977-09-01), Schober
patent: 4223125 (1980-09-01), Bier et al.
patent: 4603831 (1986-08-01), Krishnakumar et al.
patent: 5595090 (1997-01-01), Moribayashi
patent: 6000295 (1999-12-01), Kimizuka
patent: 6181899 (2001-01-01), Fukuchi
patent: 8-6437 (1996-01-01), None
patent: 9-230657 (1997-09-01), None

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