Method and apparatus for molding clay pigeons and the like

Details Method and apparatus for molding clay pigeons and the like Method and apparatus for molding clay pigeons and the like

1978-07-19

1981-06-30

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

425549, 425566, 425571, B29F 103

Patent

active

042760151

ABSTRACT:
An injection molding machine includes complementary mold members which cooperate to present a mold cavity in the shape of a clay pigeon or other articles. An injection passage leading to the mold cavity receives a slidable pin of smaller diameter than the passage. The pin has a tapered tip which, when the pin is extended by a power cylinder, seats in an outlet opening of the passage to block the opening in a manner to prevent the formation of a sprue on the part. The pin is heated along with a surrounding sleeve to maintain the material in the passage in a molten state and to assure proper release of the part from the mold. When the pin is retracted, molding material is able to flow around it, through the injection passage, and into the mold cavity.

REFERENCES:
patent: 2773284 (1956-11-01), Kelly
patent: 3945535 (1976-05-01), Leiste
patent: 4125352 (1978-11-01), Gellert

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