Metallic wall having coined knockouts and method of forming

Details Metallic wall having coined knockouts and method of forming Metallic wall having coined knockouts and method of forming

1988-05-03

1989-09-26

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having marginal feature for indexing or weakened portion for...

428571, 428577, 40606, G09F 1500, E01F 901

Patent

active

048699691

ABSTRACT:
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 form 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 fractures 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.

REFERENCES:
patent: 2109921 (1938-03-01), Leach
patent: 2350004 (1944-05-01), Whistler et al.
patent: 2401208 (1946-05-01), Walensky
patent: 2781097 (1957-02-01), Nold
patent: 3359773 (1967-12-01), Stuchbery
patent: 3583266 (1971-06-01), Kondo et al.
patent: 4348464 (1982-09-01), Khoury
patent: 4362078 (1982-12-01), Ohnishi et al.
patent: 4477537 (1984-10-01), Blase et al.
patent: 4487539 (1984-12-01), Taylor et al.
patent: 4561579 (1985-12-01), Fleming et al.
patent: 4611480 (1986-09-01), Willets

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