Patent ID: 9021759
Filing Date: 2015-05-05
Classification: E04B,E04C,Y10T

Abstract:
1. A grid runner for a suspended ceiling comprising an elongated hollow metal reinforcing bulb having a central depending rib, an elongated metal flange having a central upstanding rib, and an elongated sheet metal web having a continuous serpentine profile characterized by a plurality of crests and a plurality of valleys, each crest being situated between two valleys, the crests being fixed to the bulb rib and abutting the bulb, the valleys being fixed to the flange rib and abutting the flange, the web maintaining the bulb and flange ribs vertically spaced from one another and providing open areas between the bulb and flange ribs in areas below the crests and/or above the valleys, the sheet metal web being formed of one or more elongated sections made from coil stock of conventional width, the web being formed with slots for receiving cross tees, the web being sheared from sheet metal stock such that an upper edge of the sheared web has a profile that is the same as a bottom edge of the web, whereby the bottom edge is a geometric complement of and is of the same length as the upper edge.