Metal deforming – By tool-couple pressing together adjacent surface portions... – To form longitudinally-seamed tube
Patent
1991-01-25
1992-04-21
Larson, Lowell A.
Metal deforming
By tool-couple pressing together adjacent surface portions...
To form longitudinally-seamed tube
72306, 72319, B21D 3902
Patent
active
051056402
ABSTRACT:
An improved method and apparatus for forming box-shaped sheet metal ducts with Pittsburgh-type seams. The improved method is a continuous process in which the sheet metal is fed from an uncoiler, and after straightening and notching, the leading edge is fed into a single apparatus that performs all of the remaining forming functions. In this single apparatus, the leading edge of the material is formed into the male portion of the Pittsburgh seam, after which the box is formed and then the female portion of the Pittsburgh seam is formed and the material sheared to complete the box section. Using this improved method eliminates the moving of separate parts from one station to another, thereby improving the efficiency of the forming operation and the quality of the resulting box section.
REFERENCES:
patent: 2159784 (1939-05-01), Demmin
patent: 3269164 (1963-08-01), Rutter
patent: 3726120 (1973-04-01), Hugert
patent: 4043165 (1977-08-01), Badger et al.
patent: 4803879 (1989-02-01), Crawford
Iowa Precision Industries, Inc.
Larson Lowell A.
McKeon Michael J.
Nemmers James C.
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