B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/713
B29C 45/40 (2006.01) B29C 45/43 (2006.01)
Patent
CA 1299831
ABSTRACT OF THE DISCLOSURE The present invention provides a mold with gas ejection of pieces formed in the mold. The mold comprises 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 option chamber beneath and opening into the pin receiving recess. The spring option chamber, which can be fitted with a spring member, has a diameter less than the bottom portion of the pin to prevent downward movement of the pin into the spring option chamber.
566859
Dennison Associates
Izon Industries Ltd.
LandOfFree
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