Patent ID: 6722098
Filing Date: 2004-04-20
Classification: E04B

Abstract:
In a suspended ceiling (25) having sheets of drywall (20) secured b self-tapping screws (21) to beams (23) that form a grid (22), each of the beams (23) having an inverted T cross-section with a bulb (59) at the top, a layered web (55, 56) extending downwardly from the bulb, and flanges (61, 62) extending oppositely from the web, the improvement comprising:a. a portion extending continuously along the edge of each flange (61, 62) that is folded downwardly and inwardly on the bottom of each flange to form a hem (65) that reinforces the flanges and retains the screws (21) on the flanges, and b. upward indentations (60) on the bottom of each flange (61, 62) that seat the screws to permit the screws to engage and penetrate the flanges.