Patent ID: 7269927

Claim:
A support frame in combination with a dropped ceiling formed of a plurality of individual ceiling panels, said support frame comprising: a plurality of elongated primary rails disposed substantially parallel to one another, each having an upper face adapted to be suspended to a ceiling and opposing sides having one of a male member and a female member, said upper face having at least one protruding member; and a plurality of elongated secondary rails disposed substantially parallel to one another, each one of said secondary rails including an upper face and opposing first and second ends, at least one of said opposed first and second ends having the other of one of the male member and the female member for matingly engaging the one of said opposing sides of said primary rails for supporting said secondary rails and forming a grid pattern, said upper face having at least one protruding member mounted proximate to one of said first and second ends engaging said primary rail and being in registry with said at least one of protruding member of said primary rail, said protruding members of said primary and secondary rails being connected with at least one connecting member, and wherein a housing covers an assembly of two protruding members connected by said connecting member.