Injection molding cooled socket holder for a heated nozzle

An injection molding integral cooled socket holder to be seated in a well in a cavity plate, the socket holder having a forward end, a rear end, and a central socket extending therethrough to receive an elongated heated nozzle to convey melt to a cavity, the socket holder comprising:

• (a) a hollow rear collar portion having a central opening therethrough, a cooling fluid inlet passage and a cooling fluid outlet passage, the inlet passage having an inlet and an outlet, the outlet passage having an inlet and an outlet,
• (b) a forward socket portion having an opening therethrough to receive a forward nose portion of the heated nozzle and to provide a gate leading to the cavity, the forward socket portion having a circular cooling fluid conduit with an inlet and an outlet to convey cooling fluid around the forward nose portion of the nozzle adjacent the gate, and
• (c) a hollow central tube portion of a preselected length with a central cylindrical opening therethrough extending between the rear collar portion and the forward socket portion, the tube portion having a cylindrical outer surface, the outer surface having first and second outwardly open longitudinal grooves therein, a first small diameter tube of a preselected length being received in the first groove to provide a cooling fluid inlet duct and a second small diameter tube of a preselected length being received in the second groove to provide a cooling fluid outlet duct, the inlet duct connecting the outlet from the inlet passage in the rear collar portion to the inlet to the fluid conduit in the forward socket portion, and the outlet duct connecting the outlet from the fluid conduit in the forward socket portion to the inlet to the outlet passage in the rear collar.