Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate
2005-11-29
2005-11-29
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
C072S078000, C072S098000, C072S100000, C072S105000, C072S121000, C072S703000
Reexamination Certificate
active
06968719
ABSTRACT:
A machine may produce a tube having textured internal and external surfaces in a single operation. Inner and outer knurling tools may form the textured surfaces. The texturing of the internal and external surfaces may be helical patterns of ribs and grooves. The height of the ribs formed in the internal and external surfaces may be less than about 35 mils. The angles of the patterns relative to a longitudinal axis of the tube may be less than about 45°. The angle of the helical pattern allows textured tubes to be used as heat exchanger elements wherein flow is directed substantially coaxial to the longitudinal axes of the tubes. The helical pattern formed in the external surface may be oriented in a right hand or left hand helical orientation. Similarly, the helical pattern formed in the internal surface may be oriented in a right hand or left hand orientation.
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Meyertons Eric B.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Packless Metal Hose Inc.
Tolan Ed
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