专利名称：Fire-rated runner
发明人：Sandor A. Frecska,Gale E. Sauer 申请号：US07/864315
恋爱小故事
申请日：19920406
公开号：US05313750A
公开日：婚前协议书正规范本
叶卡捷琳娜堡
19940524
专利内容由知识产权出版社提供
烤冷面图片高清图
青春无悔作文摘要：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 dispod flanges at the bottom. To achieve controlled expansion, an extended angular lance is cut at the top of the bulb. No metal is removed at this area of maximum bending stress. Further, staggered cutouts are placed in the two thickness which make up the web. By staggering the cutout areas of adjacent web layers, the overall web strength is maintained. The 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 parate laterally and fold. The folded web configuration directed by the staggered cutout pattern will maintain longitudinal rigidity.
申请人：ARMSTRONG WORLD INDUSTRIES, INC.
元宝叠法
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