Method of manufacturing a heat exchanger tube with parallel...

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work

Reexamination Certificate

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C072S100000, C072S370160

Reexamination Certificate

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06904779

ABSTRACT:
A method of forming a finned tube in which the fins are planar, paralleled and extend radially to the tube longitudinal axis, including the steps of positioning at least one rotating forming roll against the tube exterior surface, the forming roll being spaced from the tube and rotatable about an axis that is parallel to said tube longitudinal axis, the forming roll having on the surface thereof an elongated helically arranged fin forming protrusion, the helical protrusion having a pitch of “x” and linearly advancing the tube past the forming tool a distance of “x” for each revolution of the forming roll.

REFERENCES:
patent: 4299106 (1981-11-01), Hague
patent: 4612791 (1986-09-01), Przybyla et al.
patent: 4901553 (1990-02-01), Kuroda et al.
patent: 5003690 (1991-04-01), Anderson
patent: 5146979 (1992-09-01), Zohler
patent: 5222299 (1993-06-01), Zohler
patent: 5803164 (1998-09-01), Schuez et al.
patent: 5916318 (1999-06-01), Anderson

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