Injection molding shut-off bushing with separate material flow path

An injection mold bushing comprising:

• an elongated body member having a longitudinal axis;
• said body member having two ends and a first elongated passageway substantially centrally located in said body member and substantially parallel to said longitudinal axis;
• said body member having a second longitudinal passageway substantially parallel to said longitudinal axis;
• an inlet on a first end of said body member for introducing molten plastic material into said second elongated passageway;
• a tip member positioned on a second end of said body member, said tip member having an orifice therein for passage of molten plastic material therethrough, and having a discharge chamber therein;
• a wear bushing member positioned in said chamber and at said second end of said body member;
• said wear bushing member having a first opening therein in alignment with said first elongated passageway and a second opening therein in alignment with said second elongated passageway;
• and
• an indexing member for accurately positioning said wear bushing relative to said body member such that said second opening is in alignment with said second elongated passageway.

An injection mold bushing comprising:

• an elongated body member having a longitudinal axis;
• said body member having two ends and a first elongated passageway substantially centrally located in said body member and substantially parallel to said longitudinal axis;
• said body member having a second longitudinal passageway substantially parallel to said longitudinal axis;
• an inlet on a first end of said body member for introducing molten plastic material into said second elongated passageway;
• a tip member positioned on a second end of said body member, said tip member having an orifice therein for passage of molten plastic material therethrough, and having a discharge chamber therein;
• and
• a wear bushing member positioned in said chamber and at said second end of said body member;
• said wear bushing member having a first body portion positioned adjacent said second end of said body member and a second body portion which extends into and partially fills said discharge chamber.

An injection mold bushing comprising:

• an elongated body member having a longitudinal axis;
• said body member having two ends and a first elongated passageway substantially centrally located in said body member and substantially parallel to said longitudinal axis;
• said body member having a second longitudinal passageway substantially parallel to said longitudinal axis;
• an inlet on a first end of said body member for introducing molten plastic material into said second elongated passageway;
• a tip member positioned on a second end of said body member, said tip member having an orifice therein for passage of molten plastic material therethrough, and having a discharge chamber therein;
• and
• a wear bushing member positioned in said chamber and at said second end of said body member;
• said wear bushing member having a first opening in alignment with said first elongated passageway and a second opening in alignment with said second elongated passageway;
• said wear bushing also having a first body portion positioned adjacent said second end of said body member and a second body portion which extends into and partially fills said discharge chamber.