Static structures (e.g. – buildings) – Sheetlike element assembled parallel to existing wall,... – Element spaced from wall – ceiling – or floor and held by...
Patent
1993-03-04
1994-09-20
Friedman, Carl D.
Static structures (e.g., buildings)
Sheetlike element assembled parallel to existing wall,...
Element spaced from wall, ceiling, or floor and held by...
525731, 52DIG5, E04B 900
Patent
active
053477839
ABSTRACT:
The grid member is formed of sheet metal and has an inverted T-shape with a bulb at the top, a double thickness central web and oppositely disposed flanges at the bottom. To achieve controlled expansion, two parallel lances are cut along opposite sides of the bulb near the top of the bulb. No metal is removed at this area of maximum bending stress. Further, staggered cutouts are placed in the two thicknesses which make up the web. By staggering the cutout areas of adjacent web layers, the overall web strength is maintained. These web cutouts and the lance at the top of the bulb cooperate upon thermal expansion, causing the bottom flanges to buckle down, and the web and sides of the bulb to separate laterally and fold, and the top of the bulb to buckle up. The folded web configuration directed by the staggered cutout pattern will maintain longitudinal rigidity.
REFERENCES:
patent: Re33501 (1990-12-01), Platt et al.
patent: 3175655 (1965-03-01), Brown et al.
patent: 3189138 (1965-06-01), Znamirowski
patent: 3189139 (1965-06-01), Znamirowski
patent: 3388519 (1968-06-01), Downing, Jr.
patent: 3390503 (1968-07-01), Emerick, Jr. et al.
patent: 3397501 (1968-08-01), Jahn
patent: 3496690 (1970-02-01), Jahn
patent: 3589089 (1971-06-01), Kedel
patent: 3807111 (1974-04-01), Brady
patent: 4016701 (1977-04-01), Beynon
patent: 4128978 (1978-12-01), Beynon
patent: 4598514 (1986-07-01), Shirey
patent: 4785595 (1988-11-01), Dunn
patent: 4893444 (1990-01-01), Ollinger et al.
Frecska Sandor A.
Nute, Jr. Ernest B.
Sauer Gale E.
Armstrong World Industries Inc.
Friedman Carl D.
Wilkeus Kevin D.
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