| 摘要 |
<p>Conventionally, two lengths of cross T-bar engage one upon each side of the main T-bar. In the usual construction, the ends of the cross bar portions just rest on the flange of the main T-bar and are therefore easily displaced. In another construction, they interlock through a slot in the web, can still twist and need upper clearance to engage same with the main T-bar. The present invention consists of each cross bar portion having a projecting nose portion upon the ends thereof with a hook or notch formed on the underside thereof. The projecting web end engages through a slot in the web of the main T-bar and the notch or hook is engaged over an upstanding channel formed along the edge of the flange of the main T-bar so that twisting of the cross bars relative to the main Tbar is avoided and engagement can be made from below with practically zero clearance between the ceiling and the main T-bar. Further projections from the ends of the flanges of the cross T-bar may engage notches in the flanges of the main T-bar and firmly lock the cross bars into position to prevent movement up or down or from side to side as well as preventing twisting from occurring.</p> |
