G - Physics – 09 – F
Patent
G - Physics
09
F
26/184, 20/27
G09F 15/00 (2006.01) B21C 37/08 (2006.01) E01F 9/011 (2006.01)
Patent
CA 1309566
METALLIC WALL HAVING COINED KNOCKOUTS AND METHOD OF FORMING Abstract of the Disclosure A metallic wall having coined knockouts. The wall includes a first surface and a second surface spaced from the first surface. A plurality of spaced knockout portions are positioned in incipient apertures in the wall and are disposed substantially between the surfaces. Each knockout portion is defined by a first indentation encompassing the knockout portion and extending from the first surface, and by a second indentation encompassing the knockout portion and extending from the second surface. These indentations are in alignment with a web of material of substantially uniform thickness throughout its length spacing the indentations. The outside surface defining the first indentation is inclined inwardly. A coating is applied to the second surface after formation of the indentations. A sharp blow to the knockout portion from the second surface factures the web to allow removal of the knockout portion without any material of the wall extending substantially beyond the first surface. A method of fabricating galvanized steel tubing having the knockout portions is also disclosed.
598596
Patel Vijay B.
Pavlov Zorica
Allied Tube & Conduit Corporation
Macrae & Co.
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