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US 2008/0175948 A1Published application
Sprue-cutting accessory for injection molds
OwnerAlberto NAVARRA PRUNAinventor
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OwnerAlberto NAVARRA PRUNAinventor
Estimating the term…
Inside a base element (3) that is designed to be attached to one of the two parts of the mold, specifically to the part in which the material inlet to the corresponding cavity (7) is situated, a cylindrical insert (1) is in turn situated, mounted with the freedom to rotate in the corresponding housing (2), which is also cylindrical, the material inlet (5) being established in the base (4) of said insert (1) next to the molding cavity (7), which leads with a curved path and a progressively decreasing section to the access (6) to the molding cavity (7), which is also situated in correspondence with said base (4). Thus, at the end of the injection stage of each piece, an angular rotation of the cylindrical insert (1) makes the edge of the material outlet (6), which takes the form of a sharp edge, cause the cut that shears the injection branch, thus achieving a perfect finish of the surface of the piece and preventing the usual formation of protuberances, draws and other irregularities that have a negative effect on the appearance and/or safety of the plastic piece.
Sprue-cutting accessory for injection molds, particularly for plastic pieces, wherein the molding cavity, when closed, receives the plastic injection material through at least one inlet situated in any appropriate part of said cavity, characterised in that it includes a rotating mechanism through which the melted plastic material enters the cavity that forms the mold, said mechanism rotating on itself during the mold-opening manoeuvre, bringing about the shearing of the sprue.
Sprue-cutting accessory for injection molds, particularly for plastic pieces, having a molding cavity operable to be closed, and having at least one inlet opening to receive plastic injection material and form a sprue in said inlet, characterised in that
Dependencies are inferred from the claim text.