Patent ID: 6056533
Filing Date: 2000-05-02
Classification: B29C

Abstract:
An extrusion assembly comprising:a stationary housing;an outer die and mandrel defining an annular passageway centered about an axis, wherein said outer die and mandrel are held stationary against rotational motion about said axis;a rotor rotationally supported within said housing, for rotational motion about said axis, said rotor including a melt channel for rotationally conveying an extrusion to the annular passageway, so as to form a helically wound conduit that advances linearly through the annular passageway;a central shaft defining said axis, wherein said rotor rotates about said central shaft;said central shaft being held stationary and said rotor rotates about said central shaft through a gear train;said gear train including a planetary gear mounted on said stationary housing, and wherein the gear train further includes a reduction gear assembly that rotates around said central shaft to hold it stationary.