Nitrojection Corporation

Steven L Johnson

A readily replaceable pin-in-sleeve device (A, B) for gas-assisted injection molding is used with a two-part mold to form an injection molded product from a plastic material. A sleeve (,) has a threaded exterior surface that is shaped to be received in a socket (,) of a mold member (,) opening into a mold cavity. A longitudinally extending bore (,) extends through the sleeve. The bore has a first portion (,) adjacent the cavity, and a second, larger diameter portion (,), spaced from the cavity. A pin (,) extends through the sleeve and has a forward section and an enlarged base, which are received in the bore first and second portions, respectively. A tortuous path for an injection fluid is defined between the pin and the bore to inhibit transport of plastic material into the device when the injection fluid is vented from the mold cavity. A filter,positioned in the bore, behind the pin, filters traces of plastic material from the vented injection fluid. A simple tool, such as a socket wrench, quickly unscrews the device from the mold member.

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East Claridon, OH, United States of America

Steven L Johnson