Method and apparatus for fabricating arcuate sheet metal...

Metal working – Method of mechanical manufacture – Assembling or joining

Reexamination Certificate

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C072S252500, C072S366200, C072S377000

Reexamination Certificate

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07493685

ABSTRACT:
A method and apparatus for fabricating arcuate sheet metal components for HVAC duct systems passes an elongate straight preformed strip of metal between a pair of rollers to deform the strip to form arcuate sheet metal duct components.

REFERENCES:
patent: 1761888 (1930-06-01), Junkers
patent: 4367640 (1983-01-01), Heitzman
patent: 4707899 (1987-11-01), Singer
patent: 5253501 (1993-10-01), Spath
patent: 6286352 (2001-09-01), Hackstock
patent: 7124609 (2006-10-01), Hermanson
patent: 2002/0124614 (2002-09-01), Hermanson
patent: 2004/0250596 (2004-12-01), Hermanson

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