Static structures (e.g. – buildings) – Including design feature accommodating dimensional variation...
Patent
1993-06-07
1994-09-27
Friedman, Carl D.
Static structures (e.g., buildings)
Including design feature accommodating dimensional variation...
5250607, 52 1, 52DIG5, 52232, E04C 242, E04C 252
Patent
active
053498038
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, an extended angular lance is cut at the top of the bulb. 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 bulb to separate laterally and fold. The folded web configuration directed by the staggered cutout pattern will maintain longitudinal rigidity.
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Armstrong World Industries Inc.
Friedman Carl D.
Wood Wynn E.
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