Method and apparatus for the fabrication of metal cylinders
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United States of America Patent
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Mar 3, 1998
Grant Date -
N/A
app pub date -
Jan 22, 1996
filing date -
Jan 16, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for the fabrication of a metal cylinder from a flat metal sheet is described. The cylinder is preferably, but not exclusively, for use in the construction of an outer casing for a hot water heater. Particularly, the method and apparatus is suitable for the fabrication of cylinders of different diameters with minor adjustments being necessitated to the assembly apparatus. A flat metal sheet is fed through a roll former where a curved sheet defining an unconnected cylinder having opposed overlapping free side edges is formed. Flanges are formed along the elongated edges of the cylinder with the flange of the outer overlapping edge being inturned and the flange of the inner overlapping edge being outturned. These flanges form troughs with adjacent side wall portions of the unconnected cylinder and the flanges are guidingly displaced within the trough of the opposed flanges and are clamped in overlapping engagement and secured in this position to form an open-ended cylinder of predetermined diameter. These overlapped flanges can also be spot-welded together or otherwise immovably secured.
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