Method of manufacturing lateral header extensions
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United States of America Patent
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-
Jul 21, 1987
Grant Date -
N/A
app pub date -
Jan 31, 1986
filing date -
Jan 31, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An aluminum header tube having a plurality of integral and regularly spaced lateral extensions is formed according to a method which includes the steps of forming stubs for the extensions, inserting a tool through each stub and into the interior of the header tube, sizing each stub to reduce its inside and outside diameter and, while maintaining the clamp, withdrawing the tool through the stub to cause metal to flow outwardly, thus raising or lengthening the stub to the desired degree.
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