1978-07-27
1980-05-20
Keenan, Michael J.
113120C, 72389, B21D 5118
Patent
active
042033799
ABSTRACT:
A stainless steel tub is made from sheet metal panels which are pressed to position and then welded instead of being drawn from a metal blank. The tub is made from a flat metal sheet having a bottom panel and four side panels with each side panel attached along one edge of the bottom panel. The side panels are pressed from the flat position to an upright position with respect to the bottom panel, and the pressing steps are performed with a press having an upper die constructed with a slot which receives and permits movement of one upright side panel within the slot during the time that a second adjacent side panel is being pressed upright for subsequent connection to the first panel. The press also is constructed to produce a curve in a side margin of the second side panel simultaneously with and as part of the step which pressed the first side panel to the upright position. The upper die of the press is shaped to produce a smoothly curved transition between the bottom panel and each side panel, and V shaped notches are formed at locations in the flat sheet to permit these inner curved surfaces between the side panels and the bottom panel to meet in a compoundly curved surface without buckling and without any substantial gap in the corner formed between adjacent side panels and the bottom panel.
REFERENCES:
patent: 1974794 (1934-09-01), Blickman
patent: 3127862 (1964-04-01), Presnick
patent: 3994152 (1976-11-01), Wolters
Feix Donald C.
Keenan Michael J.
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