High-performance and high-efficiency rolled fin tube and...

Details High-performance and high-efficiency rolled fin tube and... High-performance and high-efficiency rolled fin tube and...

2006-10-13

2008-09-02

Tolan, Edward (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

With tool surface orbiting around axis parallel to direction...

C072S077000, C072S098000, C072S370160

Reexamination Certificate

active

07418848

ABSTRACT:
Disclosed herein is a forming disk for fabricating a fin tube. The forming disk comprises a substantially circular plate having a shaft connection hole formed adjacent a center thereof for receiving a shaft of a form rolling machine. A plurality of projections having a first length are formed along a circumference of said plate at substantially regular angular intervals in such a way as to protrude in a radial direction, and a round curvature is formed in the formed fin at certain axial pitch periodically in a radial direction. Also disclosed is a high-performance and high-efficiency fin tube having formed fins. Each formed fin comprises a generally circular plate having a crest and a valley formed in both side faces at certain angular intervals along the circumference thereof so as to form a continuous curvature.

REFERENCES:
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patent: 4612791 (1986-09-01), Przybyla et al.
patent: 4915166 (1990-04-01), Cunningham et al.
patent: 7197808 (2007-04-01), Zimprich

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