Injection molding nozzle having circumferentially spaced conductive probes

In a heated injection molding nozzle to be seated in a well in a cavity plate to convey melt through the nozzle from a nozzle inlet towards a plurality of spaced gates extending through the cavity plate adjacent the nozzle, the nozzle having a central portion, a rear end and a collar portion adjacent the rear end, the central portion having a forward end and a cylindrical outer surface extending from the collar portion, the nozzle having a central melt bore which extends from the inlet at the rear end to the forward end of the central portion, the nozzle having an electrically insulated heating element with a rear end portion and a spiral portion which is integrally brazed in a channel in the cylindrical outer surface of the central portion of the nozzle, the rear end portion of the heating element extending out through the collar portion to an electrical terminal, the improvement wherein;

• the nozzle has an outer sleeve portion which encircles the cylindrical outer surface of the central portion of the nozzle adjacent the forward end of the central portion, the sleeve portion having a plurality of longitudinal conductive probes spaced around the sleeve portion, the probes each having a forward portion which extends a predetermined distance forwardly of the forward end of the central portion of the nozzle to provide additional heat to the melt which flows past the forward portion to one of the gates.