Adjustable mounting bracket for suspended ceiling
A load bearing assembly for supporting a lighting or fan fixture on a drop ceiling having a grid supporting structure. The assembly includes a single center bar, two end brackets with widely spaced support legs, and an electrical box. The support legs include removable portions that allow rapid modification to accommodate ceiling tiles of uniform thickness or ceiling tiles having a stepped edge. By adjusting the length of the legs, the lower surface of the tiles is leveled with the lower edge of the electrical box for either tiles of uniform thickness or those having stepped edges. A fastening arrangement enables adjustment of the end brackets with respect to the center bar, thereby allowing rapid fitting to adjacent T-rails. A locking arrangement enables easy adjustment of the location of the electrical box along the length of the center bar, thereby allowing the assembly to be rapidly fitted to a desired location on a drop ceiling.
1. A load bearing assembly for supporting a lighting or fan fixture on a drop ceiling comprising:
an elongated one-piece center bracket having a longitudinal central channel, a top portion, and a bottom portion;
a one-piece elongated tubular bar of rectangular cross section extending through said central channel, said tubular bar having two ends;
said bracket extending around the periphery of said tubular bar;
an elongated end bracket at each end of said tubular bar, said end bracket having two ends and two sides;
widely spaced support legs extending downwards from each of said ends of said end brackets;
a turnbuckle having an upper and a lower end;
said lower end of said turnbuckle pivotally attached to said center bracket;
said support legs include lower ends;
notches in said support legs located a first distance above said support leg lower ends;
said notches creating removable end portions on said support leg lower ends;
stubs of rectangular cross section extending from said sides of said end brackets, said stubs received within said tubular bar and slideable with respect to said bar;
a flat bracket back plate enclosed within said tubular bar; and
an electrical box secured to said bottom portion of said center bracket.
2. The assembly of claim 1 wherein said center bracket extends a measurable distance along said bar.
3. The assembly of claim 1 including
an opening extending longitudinally along said top portion of said center bracket;
two sides at said opening of said top portion; and
a wing oriented longitudinally with respect to said tubular bar and extending upwards from each side of said top portion at said opening and thereby forming opposing wings planar to one another.
4. The assembly of claim 3 including
an aperture in each of said wings, said apertures in axial alignment;
said lower end of said turnbuckle including a hook with an opening therein; and
a bracket fastener through said wings and said opening of said hook;
whereby said bracket fastener in a loosened state enables pivoting of said turnbuckle longitudinally with respect to said tubular bar.
5. The assembly of claim 1 wherein
said turnbuckle is capable of being pivoted longitudinally with respect to said tubular bar;
said assembly includes an operational configuration in which said turnbuckle is locked vertically upwards with respect to said tubular bar; and
said assembly includes a shipping configuration in which said turnbuckle is locked horizontally and longitudinally with respect to said elongated tubular bar.
6. The assembly of claim 1 including
a lower edge on said electrical box;
said lower edge of said electrical box level with said lower end of said support legs; and
removing said removable end portions locates said lower edge of said electrical box below said lower ends of said support legs by said first distance.
7. The assembly of claim 1 wherein said tubular bar includes a rectangular shaped channel therein.