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US 7,458,799 B2Granted
Tapered hollow pole extruder
OwnerGlen DeFreitasinventor
Life of this patent
Estimating the term…
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 The extrusion mold head also has an inner mold tapered mandrel that is advanced or withdrawn in concert with the movement of the outer mold head pieces.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.
Claims24
A tapered hollow pole extruder comprising:
- a) an extrusion mold housing with a plastic material supply inlet;
- b) a mold bead comprising:
- i) a cylindrical cam sleeve comprising a plurality of circumferential grooves on the inner surface of said cylindrical cam sleeve;
- ii) coordinated arms that are rotatable within the mold head and that define a periphery of an extrusion aperture, wherein each of said coordinated arms comprises a plurality of teeth that are adapted to engage said circumferential grooves;
- and
- iii) a tapered mandrel that is moveable within the mold head and defines a blockage in a central portion of the extrusion aperture;
- in which movement of said cylindrical cam sleeve along its longitudinal axis effects rotation of the coordinated arms, and the periphery of the aperture varies in size depending on rotation 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.
4 more elements
A tapered hollow pole extruder comprising:
- a) an extrusion mold housing;
- b) a earn housing comprising an attachment surface on the inner surface of said cam housing;
- c) coordinated arms that are rotatable within the cam housing and that define a periphery of an extrusion aperture, wherein each of said coordinated arms comprise an engagement surface tat is adapted to engage said attachment surface;
- and
- d) a tapered mandrel that is moveable within the cam housing and defines a blockage in a central portion of the extrusion aperture;
- in which lateral movement of said cam housing effects rotation of the coordinated arms, and the periphery of the aperture varies in size depending on the rotation of the coordinated arms within the, cam housing, and the blockage of the central portion of the aperture varies in size depending on the movement of the tapered mandrel within the cam housing.
3 more elements
Dependencies are inferred from the claim text.