Louvered ceiling

Claim 1

In a louvered ceiling having at least one runner of upwardly open first channel section, comprising a first sidewall, a second sidewall and a first base wall joining said sidewalls, and having a louver adapted to be supported on said runner and comprising at least one upwardly open channel member having a third sidewall, a fourth sidewall and a second base wall joining said sidewalls, the improved assembly comprising a substantially planar tab or tabs joined to the end of at least one of said sidewalls of said channel member along an upper length thereof, said length extending downwardly from the top of said end to a point above the bottom of said end; each of said tab or tabs extending from said end of said sidewall in a direction perpendicular to that sidewall and away from the other sidewall; each of said tab or tabs defining one edge of a first slot between said end of said sidewall and said tab, said first slot extending upwardly from the lowermost portion of said tab to said point along said upper length along which said tab is joined to said end; a downwardly extending second slot disposed in said first sidewall of said runner, said second slot having an outwardly widened upper portion and having a narrowed portion, said narrowed portion being of such width as to firmly but slidingly accommodate said sidewall or sidewalls of said second channel member which are provided with said tab or tabs; said second slot being sufficiently narrow at all points so that when said sidewall or sidewalls of said second channel member which are provided with said tab or tabs are inserted into said second slot, the open area defined by said second slot is entirely overlapped by the combined areas of said tab or tabs and the space between said third and fourth sidewalls.