Metal working – Means to assemble or disassemble – Overedge assembling means
Patent
1984-08-31
1987-09-15
Godici, Nicholas P.
Metal working
Means to assemble or disassemble
Overedge assembling means
72 48, 72 18, 413 27, 413 30, 413 31, B21D 3904
Patent
active
046929800
ABSTRACT:
A method and apparatus are disclosed for fabricating an arcuate seam between two pieces of sheet metal. The method involves a three-step process in which an arcuate standing seam is formed on a first piece of sheet metal, the marginal edge of a second piece of sheet metal is inserted into the pocket of the standing seam, and the pocket of the standing seam and the marginal edge inserted therein are simultaneously bent so that they lie along the surface of the first piece of sheet metal, thus locking together the two pieces of sheet metal. The arcuate standing seam is formed by an apparatus including a plurality of form roller pairs arranged along an arc. Each pair of form rollers has complementary edges that form a nip through which the arcuate edge of the sheet metal workpiece is passed, the shapes of the edges of the successive roller pairs along the arc gradually attaining the shape of the standing seam. The workpiece is secured in a pivoting hold-down means in which the pivot point is coincident with the center of curvature of the arc described by the form rollers. After the workpiece edge passes through the form rollers, the seam formed thereon is forced through a straightener having a converging passageway that removes the waves left in the seam due to its formation. The locking seam is completed by securing the second piece to a circular drum having the same radius of curvature as the arcuate standing seam. The marginal edge of the second piece extends beyond the edge of the drum a sufficient distance to fit within the pocket of the arcuate standing seam. The first piece is then secured to end of the drum with the marginal edge portion of the second piece inserted into the pocket of the standing seam. The drum is then rotated to pass the pocket of the standing seam and the edge through a series of form rollers that simultaneously bends the pocket of the standing seam and the marginal edge of the second piece inserted therein so as to lie along the surface of the first piece, thus locking the two pieces together.
REFERENCES:
patent: 2264060 (1941-11-01), Whyte
patent: 2825384 (1958-03-01), Goldsmith
patent: 4006520 (1977-02-01), Wachter
patent: 4406199 (1983-09-01), Rom
Catalog: "Lockformer Where the Machines of Tomorrow are Made Today", LC 82-15, The Lockformer Company.
Catalog: "Roll Forming Profile Ideas", Catalog 1070, revised 880, The Lockformer Company.
Catalog: "New Lockformer LC Series Roll Formers", Catalog No. 676, The Lockformer Company.
Carroll Michael W.
Harwood Michael E.
Godici Nicholas P.
Kearns Jerry
North American Agricultural, Inc.
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