High strength runner

Abstract

A suspended ceiling grid beam is provided that has an increased beam height to provide enhanced resistance to downward deflection. The beam has a cross-section generally in the form of an inverted T, with a central web, a pair of panel support flanges extending from one edge of the web, and a reinforcing bulb extending from the other edge of the web. The reinforcing bulb has a generally planar, fin-like structure extending therefrom opposite to and generally co-planar with the central web.

1 . A grid tee for a suspended ceiling having a cross-section generally in the form of an inverted T with a central web with first and second opposed edges, a pair of panel support flanges extending from the first edge of the web, a reinforcing bulb extending from the second edge of the web, and a fin that is generally co-planar with the central web extending from the reinforcing bulb opposite to the central web.  
   
   
       2 . The grid tee of  claim 1  wherein the fin and the reinforcing bulb each having a height that is variable, with the sum of the heights of the fin and the bulb being a predetermined value.  
   
   
       3 . The grid tee of  claim 1  wherein the fin comprises a double layer web with a reinforcing strip disposed between the layers.  
   
   
       4 . The grid-tee of  claim 1  wherein the fin includes a series of spaced apertures adapted to receive hangar wire for suspending the grid tee.  
   
   
       5 . The grid tee of  claim 1  wherein the fin includes a series of spaced embossments, each embossment having an aperture adapted to receive a hangar wire for suspending the grid tee.  
   
   
       6 . The grid tee of  claim 1  wherein the fin has an inverted, drop-shaped cross section.  
   
   
       7 . The grid tee of  claim 1  wherein the web comprises a double layer, the layers being secured together by a plurality of stitches at spaced intervals along the web, the stitches being formed with a pair of opposed horizontally oriented cuts through the two layers of the web and each stitch including a vertical displacement to resist motion in a horizontal direction.  
   
   
       8 . The grid tee of  claim 7  wherein the vertical displacement in each stitch comprises a vertical cut through the stitch.  
   
   
       9 . The grid tee of  claim 7  wherein the vertical displacement in each stitch comprises a central portion of each stitch being displaced back into a plane defined by the layers of the web.  
   
   
       10 . A grid tee for a suspended ceiling, having a cross-section generally in the form of an inverted T with a central double layer web having first and second opposed edges, a pair of panel support flanges extending from a first edge of the web, a reinforcing bulb extending from the second edge of the web, and a plurality of stitches at spaced intervals in the web to secure the layers together, the stitches being formed with a pair of opposed, horizontally oriented cuts through the two layers of the web and each stitch including a vertical displacement to resist motion in a horizontal direction.  
   
   
       11 . The grid tee of  claim 10  wherein the vertical displacement in each stitch comprises a vertical cut through the stitch.  
   
   
       12 . The grid tee of  claim 10  wherein the vertical displacement in each stitch comprises a central portion of each stitch being displaced back into a plane defined by the layers of the web.  
   
   
       13 . A grid tee for a suspended ceiling having a cross-section generally in the form of an inverted T with a central web with first and second opposed edges, a pair of support flanges extending from the first edge of the web, and a reinforcing bulb extending from the second edge of the web, the reinforcing bulb having a cross section with a narrow central portion and a relatively wider top and bottom portion.