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US 2007/0184147 A1Published application
Tapered hollow pole extruder
OwnerGlen DeFreitasinventor
Life of this patent
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Abstract
An extrusion mold head is provided having outer mold tapered cams that form an automatically contracting or expanding mold surface during extrusion of the poles, allowing the formation of tapered outer diameter on each pole. The extrusion mold head also has an inner mold tapered mandrel that is advanced or withdrawn in concert with the movement of the outer mold head pieces. The inner mold surface thereby automatically contracts or expands as required during extrusion of the poles to form either a uniform thickness or a tapering thickness of the wall of each pole.
Claims29
A tapered hollow pole extruder comprising:
- a) an extrusion mold housing with a plastic material supply inlet;
- b) a mold head comprising:
- i) coordinated arms that are moveable within the mold head and that define a periphery of an extrusion aperture;
- and
- ii) a tapered mandrel that is moveable within the mold head and defines a blockage in a central portion of the extrusion aperture;
- in which the periphery of the aperture varies in size depending on movement of the coordinated arms within the mold head, and the blockage of the central portion of the aperture varies in size depending on the movement of the tapered mandrel within the mold head.
3 more elements
Dependencies are inferred from the claim text.