| 主权项 |
1. A suspended ceiling grid comprising a plurality of parallel regularly spaced main runners, each one of a pair of opposed oppositely facing channels being disposed adjacent one end of said main runners, said channels each having a vertical web and a horizontal flange at top and bottom edges of the web, a bracket at each end of each main runner, the bracket being attached to the main runner with a first self-drilling screw and to the web of the channel with a second self-drilling screw, each main runner extending in one piece from one channel to the other channel and being exclusively supported by the channels with sufficient support capacity to permit the main runners to support a conventional acoustical ceiling while being free of suspension wires or other overlying support elements along the full length of the main runners between said channels, each main runner having an upper reinforcing bulb and a lower flange, the bracket having a main runner engaging portion with upper and lower edges extending along the portion, the lower edge being straight along its full flange engaging length and fitted to the flange such that there is essentially no ability of the bracket to rotate perceptively relative to the main runner and otherwise allow the main runner to droop perceptively below its originally installed position, the flange at the top of the channel web serving to stiffen the channel web to prevent the channel web from pulling away from the respective wall due to a load imposed on the channel by the main runners. |
