Lighting fixture with uniform mounting frame for old installations

Claim 1

A lighting fixture adapted to be mounted to a tile ceiling structure or the like having an aperture formed therein comprising a support frame including side and end portions defining a generally rectangular configuration having an opening, a transversely directed gap formed in one of said portions and extending to said opening, said frame including a generally planar undersurface portion adapted to rest on the upper surface of said ceiling surrounding said aperture, a plurality of angularly spaced apart guideway portions formed in said frame in proximate spaced relation to and extending in a direction generally parallel with said undersurface, a mounting member supported in each said guideway, said mounting members being generally U-shaped in transverse section and including a first leg slidably supported in said guideway for movement in a plane generally parallel with said undersurface, and a branch portion extending downwardly from said first leg to a position below the plane of said undersurface and an attachment leg of shorter length than said first leg and disposed in parallel spaced relation therebeneath, said attachment leg including a sharpened end portion adapted to be embedded into the material of said ceiling responsive to outward sliding movement of said mounting members in said guides, thereby clampingly to support said frame to said ceiling, said fixture including a reflector member and means for removably supporting said reflector member in said opening.