Patent ID: 7329117

Claim:
An injection molding nozzle, comprising: an inner insert; an outer insert; and a sealing surrounding piece, wherein on the outside the outer insert has a threaded portion for engagement in a nozzle housing, followed by a first scalloped portion for centering in the nozzle housing, a second scalloped portion for centering of the sealing surrounding piece, a portion shaped for torque, and a small cylindrical portion which forms a primary seal against the mold pocket, wherein the back end of the inner insert has a shape designed for torquing, and wherein the inner insert is configured to be threadably engaged in the outer insert, on the inside, the inner insert has a large central duct for the delivery of molten plastic, and wherein the sealing surrounding piece is configured to become compressed between the outer insert and the nozzle housing as the outer insert is tightened in the nozzle housing to create an axial seal, which sealing surrounding piece has an outer portion configured to contact the mold pocket, so as to create a leak-proof secondary seal, on the inside, the sealing surrounding piece has a slightly tapered, guide-in portion, followed by a cylindrical portion, where contact between the outer insert's second scalloped portion and the inner cylindrical portion of the sealing surrounding piece ensures centering between these two components.