Method of manufacturing lateral header extensions

Details Method of manufacturing lateral header extensions Method of manufacturing lateral header extensions

1986-01-31

1987-07-21

Goldberg, Howard N.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291573R, 291574, 72359, 72391, 165173, B21D 5300

Patent

active

046808450

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.

REFERENCES:
patent: 4152818 (1979-05-01), Mort et al.
patent: 4290413 (1981-09-01), Goodman et al.

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