Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream... – Including auxiliary shaping means associated with molding...
Reexamination Certificate
2006-02-03
2008-12-02
Davis, Robert B. (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
Including auxiliary shaping means associated with molding...
C425S327000, C425S465000, C425S466000
Reexamination Certificate
active
07458799
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 The extrusion mold head also has an inner mold tapered mandrel that is advanced or withdrawn in concert with the movement of the outer mold head pieces.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.
REFERENCES:
patent: 1440007 (1922-12-01), Freeman et al.
patent: 2780835 (1957-02-01), Sherman
patent: 2966934 (1961-01-01), Huet
patent: 3178770 (1965-04-01), Willis
patent: 3480999 (1969-12-01), Carlo
patent: 3932090 (1976-01-01), Brumlik
patent: 5989466 (1999-11-01), Kato et al.
patent: 2003/0206990 (2003-11-01), Edmondson et al.
Chan Lawrence
Davis Robert B.
Leyson Joseph
Smiths IP
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