1975-12-10
1978-04-18
Larson, Lowell A.
72393, B21D 5332
Patent
active
040845265
ABSTRACT:
A method of forming annular rings having portions of the ring material disposed radially of the ring axis from strips of flat material by forming cylindrical work-pieces from elongated strips of material with the ends of each of the strip being welded together to form a cylindrical work-piece having its material extending axially of the ring, supporting spaced annular portions at the inner circumference of the work-piece, and displacing a portion intermediate the internal annular portions of the work-piece radially outwardly while the outer perimeter of the work-piece is unsupported.
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patent: 3357229 (1967-12-01), Luedi
patent: 3798728 (1974-03-01), Beisch
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