Stack mold with spring loaded blow off pin

Details Stack mold with spring loaded blow off pin Stack mold with spring loaded blow off pin

1991-07-01

1994-10-18

Nguyen, Khanh

Plastic article or earthenware shaping or treating: apparatus

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

With product ejector

425422, 425437, 425444, 249 67, 249 68, B29C 4540, B29C 4543

Patent

active

053562844

ABSTRACT:
The present invention provides a mold with gas ejection of pieces formed in the mold. The mold includes a female body part and a male body part. The male body part includes a male molding surface with a surrounding plastic injection shut off face and a reciprocable gas controlling blow off pin slideably trapped within a pin recess at the shut off face. The pin has an enlarged bottom portion and a narrowed upper portion with a gas passage starting upwardly through the lower bottom portion into the upper portion and opening sideways through the pin which has a solid top surface above the sideways opening. The pin receiving recess has an undercut configuration including a small diameter upper region and a larger diameter base region with clearance for sliding of the pin in the recess. The clearance is at a minimum near the solid top surface of the pin and increases downwardly from the upper to the lower portion of the pin. The mold further includes a spring fittable chamber beneath and opening into the pin receiving recess. The spring fittable chamber has a diameter less than the bottom portion of the pin to prevent downward movement of the pin into the spring fittable chamber.

REFERENCES:
patent: 1930815 (1933-10-01), Lund
patent: 3363040 (1968-01-01), Aoki
patent: 3963209 (1976-06-01), Muller
patent: 4050666 (1977-09-01), Van Tichelt
patent: 4452420 (1984-06-01), Lundquist
patent: 4653997 (1987-03-01), Sheffield et al.
patent: 4710124 (1987-12-01), Harrison

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