Patent ID: 7096585
Filing Date: 2006-08-29
Classification: B21C,Y10T

Abstract:
1. A method for forming a duct member for use in an air handling system comprising the steps of: a) providing a tubular work piece having a general constant diameter along the length of the tube; b) inserting the tubular work piece into an automatic adjustable duct machine and performing the following steps c) through i) without removing the tubular work piece from the automatic adjustable duct machine; c) clamping the bottom of the work piece d) cutting and preforming the tubular work piece into a first work piece portion and a second work piece along a plane at an angle to a radial plane perpendicular to the longitudinal axis of the work piece; e) rotating the first work piece portion 180 degrees relative to the second work piece portion such that the first work piece portion is angled to the second work piece portion by an angle generally equivalent to twice the angle of the cut; f) adjustably connecting the first work piece portion to the second work piece portion while the first work piece portion is angled to the second work piece portion by an angle generally equivalent to twice the angle of the cut; g) rotating the reconnected work piece 180 degrees; h) moving the work piece longitudinally to a second position; i) repeating steps d–f j) releasing the clamped bottom of the work piece such that the work piece can be removed from the automatic adjustable duct machine.