Method and apparatus for manufacturing a helically-wound lock-seam tube having air nozzles
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United States of America Patent
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-
Sep 24, 2002
Grant Date -
N/A
app pub date -
Sep 5, 2000
filing date -
Sep 6, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method of manufacturing a helically-wound lock-seam tube for a ventilation duct system, the tube is provided with a plurality of air nozzles through its wall. The method involves the steps of: feeding a strip of sheet metal from a supply to a punching and pressing unit; punching and pressing the strip in the punching/pressing unit to form two rows of spaced openings through the strip; feeding the punched strip to a roller unit, in which a longitudinal bead is formed in the strip; feeding the punched and beaded strip to a forming head in which the strip is helically-wound to form a tube having a helical lock seam; feeding the helically-wound lock-seam tube out of the forming head; and cutting the tube into desired lengths. The apparatus has components for carrying out the various method steps, and the finished tube is provided with a desired pattern of air nozzles.
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