Lock mold assembly for a container mold

Claim 1

A mold assembly adapted for injection molding multipartitioned, thin walled containers comprising in combination a core member having a plurality of depending core segments each fixedly mounted at one end, a cavity member for receiving the core member, port means in the cavity member adjacent the free ends of the core segments for injecting moldable material into the space between the cavity member and the core member, locking means within the core segments extendable to engage the port means and thereby lock the free ends of the core segments in fixed position during injection of the moldable material and retractable after the space between the core member and cavity member has been filled with the moldable material to allow such material to then fill the space initially occupied by the locking means when engaged with the port means said locking means include an elongated rod positioned and movable within each core segment and having a generally concave terminal section, said port means being integral with the cavity member and each in registry with a corresponding locking means and each having a generally raised conical shape so as to mate into and with the corresponding concave terminal section of the elongated rod and to form therebetween at least one runner for passage of the moldable material from the port means into the space between the cavity member and the core member.