| 摘要 |
A roll formed sheet metal grid tee, having a multilayer web, is rigidified by a series of longitudinally spaced tabs lanced through the web. The tabs are cut with a dovetail shape and are foreshortened relative to the holes, made when they are formed, by bending them along a line parallel to a side of the tab that remains uncut. After being foreshortened, the tab is pressed back into its associated hole and tight locking interference is developed between the divergent dovetail sides of the tab and the hole. The tab is incompletely pushed back into the hole so that the layers of the tab are misaligned with corresponding respective layers of the web to assure that the tabs prevent relative shear-like movement and/or spreading of the web layers.
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