An elongated ceiling grid member and a ceiling grid assembly that includes a plurality of the elongated ceiling grid members are disclosed. The elongated ceiling grid member may include an upper portion, a lower portion and a middle portion that connects the upper portion and the lower portion. The upper portion may include a first pair of spaced and substantially parallel sidewalls having ridged interior surfaces that face each other. Similarly, the lower portion may include a second pair of spaced and substantially parallel sidewalls. Each sidewall of the second pair of sidewalls may include upper and lower ridged interior surfaces, with the distance between the upper ridged interior surfaces being different than the distance between the lower ridged interior surfaces. A plurality of the elongated grid members can be connected at their ends to form a grid of the plurality of elongated grid members.

A ceiling system having a perimeter frame; a grid configured to support a plurality of substrates; and a plurality of bracket assemblies coupling the grid to the perimeter frame, the plurality of bracket assemblies adjustable between a plurality of states in which the grid is supported at a different height relative to the perimeter frame in each of the plurality of states.

A method, system, and tool are disclosed for installation of ceiling tiles in an improved mounting hook assembly to form a concealed grid system The system includes elements for attaching the mounting hook assembly to the tile; rotating a load bearing lever member; rotating a positioning lever member to position the load bearing member on a flange of a T grid bar; and fixing the tile below the T grid at a distance that is greater than the thickness of the tile so that when the tile is lifted up, the load bearing lever is returned to a position above the flange level of the T grid and any tile can be removed or installed in a totally concealed grid system without dislocating tiles already laid. A tool is used to engage and disengage the tiles.

A ceiling suspension system is disclosed and includes a plurality of grid members configured to form a grid for the ceiling suspension system, each grid member comprising a bulb, a web and a flange. The system also includes a plurality of wall support brackets configured to mount the grid to walls in a structure. Each wall support bracket comprises a vertical back, a lower flange at a lower end of the vertical back, and an upper flange at an upper end of the vertical back. Further, the upper flange is generally V-shaped when viewed longitudinally and each wall support bracket only one tab in the lower flange for each grid member. Moreover, the only one tab is configured to engage and retain the flange of a respective grid member, such that the respective grid member rests on the lower flange.

A ceiling suspension system is disclosed and includes a plurality of grid members configured to form a grid for the ceiling suspension system, each grid member comprising a bulb, a web and a flange. The system also includes a plurality of wall support brackets configured to mount the grid to walls in a structure. Each wall support bracket comprises a vertical back, a lower flange at a lower end of the vertical back, and an upper flange at an upper end of the vertical back. Further, the upper flange is generally V-shaped when viewed longitudinally and each wall support bracket only one tab in the lower flange for each grid member. Moreover, the only one tab is configured to engage and retain the flange of a respective grid member, such that the respective grid member rests on the lower flange.

A cross member of a T bar ceiling system is designed to be part of the ceiling grid system and adapted to releasably receive a strip light beneath the cross T member. The strip light provides support flanges beneath the T member for supporting a ceiling panel edge at the conventional height. With this arrangement the grid system can be installed in the normal manner with these cross T's at positions where strip lights are to be secured. The strip lights can be installed at a later point in time. Preferably a push type releasable connection is used.

A universal partition clip is formed from a single piece of sheet metal and is adapted to be efficiently mounted to the underside of a T-bar flange. The clip comprises a bottom panel of generally uniform width and a pair of parallel side panels with a pair of generally coplanar lips spaced above the bottom panel. Integral resilient tabs are spaced above the bottom panel and have portions slightly above the lips. The tabs and lips cooperate to mount the clip to the flange portion of the T-bar member.

A universal partition clip is formed from a single piece of sheet metal and is adapted to be efficiently mounted to the underside of a T-bar flange. The clip comprises a bottom panel of generally uniform width and a pair of parallel side panels with a pair of generally coplanar lips spaced above the bottom panel. Integral resilient tabs are spaced above the bottom panel and have portions slightly above the lips. The tabs and lips cooperate to mount the clip to the flange portion of the T-bar member.

The invention provides a bracket design for connecting cross and main tees of a suspended ceiling in non-rectangular joints to provide a wide variety of ceiling patterns including rhombic and triangular shapes.

The invention provides a bracket design for connecting cross and main tees of a suspended ceiling in non-rectangular joints to provide a wide variety of ceiling patterns including rhombic and triangular shapes.