B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/03 (2006.01) B29C 45/17 (2006.01) B29C 45/18 (2006.01)
Patent
CA 2044101
A gas assisted injection molding apparatus of the type in which a supply of resin is introduced into a cavity in a mold at a resin injection location and gas injection means are provided to introduce gas into the mold cavity at a gas injection location removed from the resin injection location to assist the resin in filling out the mold cavity. The gas injection means includes a bore in the mold communicating with the mold cavity, a pin having a size to fit slidably in the bore and including a central axial passage for delivery of gas into the mold cavity through the pin, a power cylinder assembly mounting the pin for movement between an advanced gas injection position in which the pin is positioned in the bore with its forward tip in communication with the mold cavity and a retracted position in which the mold cavity is vented through the bore, and means defining an annular edge on the pin operative to remove obstructions with each forward movement of the pin from its retracted position to its advanced position.
Loren Norman S.
Ridout & Maybee Llp
LandOfFree
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