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US 6,643,930 B2Granted
Method and apparatus for producing end flange member for cylindrical duct
OwnerRobert Issagholian-Havaiinventor
Life of this patent
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Abstract
A method for producing a cylindrical flange for the end of an air duct is produced by compressing a panel by differing amounts to cause the panel to take on an arcuate cylindrical shape.
Claims1
A method for producing a hollow cylindrically shaped flange to be mounted on the end of a hollow cylindrical duct, comprising the steps of
- (a) providing a substantially rectangular panel of metal having at least first and second spaced apart generally parallel peripheral edges;
- (b) rolling the first edge around an elongate metal rod;
- (c) folding the panel of metal along a line generally parallel to the edges to produce an elongate generally L-shaped metal piece;
- and,
- (d) rolling the L-shaped metal piece to compress selected areas of the L-shaped metal piece such that the metal piece takes on a cylindrical shape.
2 more elements
Dependencies are inferred from the claim text.