Loading patent…
AssigneeH. H. Robertson Company
InventorsCharles R. Gray, John O. Hazen, Charles J. Kelly
Estimating the term…
A floor structure comprising a metal subfloor including metal cellular units providing plural enclosed cells; housings associated with certain of the cells, each adapted to provide future access to different electrical services at one location in the floor structure; a covering layer of monolithic concrete covering the subfloor and the housing, and a layer of fireproofing material covering the lower face of the metal subfloor. Activating means is provided establishing access to the enclosed cells through the housing without significantly reducing the desired fire endurance of the floor structure and without increasing the thickness of the layer of fireproofing material. The fireproofing material has a thickness which is less than that required to provide the floor structure with a desired fire endurance when the housing is activated. A method is disclosed for establishing acess to the enclosed cells through the insert while maintaining the fire endurance capability of the floor structure.
In a floor structure of the type comprising a metal subfloor providing generally parallel enclosed cells separated by lengthwise troughs;
The floor structure of claim 2 or 1 wherein said rigid insulation block comprises glass fiber board.
A two-piece insulated cover for an underfloor electrical housing, each piece of said cover comprising:
A two-piece insulated cover for an underfloor electrical housing, each piece of said cover comprising:
Dependencies are inferred from the claim text.