Charlotte Pipe and Foundry Company

Jasper D Barber

The internal core of a molding apparatus does not have to be axially moved for molding a plastic pipe provided with a peripheral groove therein. This is accomplished by providing the internal core with a groove of such narrow width as to always be open to the surrounding cooperating mold body while at the same time preventing plastic material from entering the groove as the plastic material is being introduced into the mold cavity.

Apparatus for molding plastic pipe fitting with internal groove therein

An injection molding apparatus, including a mold having a mold cavity therein defining the outer periphery of a pipe fitting, has a core pin assembly adapted to be positioned in the cavity and which comprises opposing distal core sections whose proximal ends abut an intermediate core section therebetween. The core sections are mutually separable and have passages for accommodating a fluid coolant therein, and when the core sections are assembled, at least certain passages in either or both distal core sections are in fluid intercommunicating relation with passages in the intermediate core section. Means is provided for circulating fluid coolant through passages in all the core sections and comprises pump means for pumping fluid coolant at a predetermined pressure through the intercommunicating passages and for concurrently withdrawing the coolant therefrom at a suction pressure greater than the predetermined pressure to prevent leakage of the coolant from the intercommunicating passages outwardly between the abutting proximal ends of the corresponding core sections and into the mold cavity.

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Charlotte, NC, United States of America

Jasper D Barber