초록 ▼

A mold for use in a plastic injection molding system includes a venting pin assembly which can not only vent an article-defining cavity in the mold but can also eject a formed plastic article in an open position of the mold. A porous insert of the assembly permits air from the article-defining cavit

A mold for use in a plastic injection molding system includes a venting pin assembly which can not only vent an article-defining cavity in the mold but can also eject a formed plastic article in an open position of the mold. A porous insert of the assembly permits air from the article-defining cavity to flow there-through while preventing the passage of molten plastic from the article-defining cavity in a closed position of the mold. A venting pin of the assembly in the form of a hollow ejector pin has an elongated aperture formed therethrough to permit the flow of air therethrough. The porous insert is positioned in the aperture at a gas hole formed through an end surface of the ejector pin. The insert and the gas hole are sized so that the insert and the end surface help to form a "Class A" surface on the article formed in the article-defining cavity.

대표청구항 ▼

[ What is claimed is:] [1.] A mold for use in a plastic injection molding system, the mold comprising:a first mold half;a second mold half, the first and second mold halves being movable relative to each other between an open position and a closed position, wherein the first and second mold halves d

[ What is claimed is:] [1.] A mold for use in a plastic injection molding system, the mold comprising:a first mold half;a second mold half, the first and second mold halves being movable relative to each other between an open position and a closed position, wherein the first and second mold halves define an article-defining cavity; anda venting pin assembly including:a venting pin slidably fit within the second mold half and which partially defines the article-defining cavity in a closed position of the mold and is movable relative to the second mold half to eject an article formed within the article-defining cavity in the open position of the mold, the venting pin having an elongated aperture formed completely therethrough in communication with the article-defining cavity to permit air from the article-defining cavity to flow therethrough; anda porous insert positioned in the aperture, the insert permitting the flow of air therethrough but prevents the passage of molten plastic from the article-defining cavity into the aperture wherein the venting pin has an end surface with a gas hole formed therethrough to permit the air from the article-defining cavity to flow therethrough, the insert being located at the hole so that the insert and the end surface partially defines the article-defining cavity wherein the insert and the gas hole are sized so that the end surface and the insert help to form a "Class A" surface on the article formed in the article-defining cavity and the venting pin including means for holding the insert in position within the aperture.