Underfloor assembly system having sub-floor accessory panels

Claim 1

An underfloor assembly for a building, comprising a plurality of elongated, corrugated, metal flooring units and a plurality of elongated, metal, cable distribution ducts arranged side-by-side with said flooring units, said flooring units and said cable distribution ducts being adapted to be supported by the structural beams of the building; a plurality of spaced-apart elongated cable trenches adapted to carry cables of different types therein and extending over and transversely across said flooring units and said cable distribution ducts; said cable distribution ducts comprising an elongated, longitudinally extending base means and wall means secured thereon defining at least two cell means longitudinally extending along said base means for containing and separating cables of different types, said wall means being cut away at the intersections of said trenches and said cable distribution ducts to provide an area on said base means free from any cell means, said base means having openings therein at desired free areas thereof, and an open pan means depending from said base means and extending through a said opening; said trenches comprising an open, longitudinally extending, U-shaped base pan means having a bottom portion and opposed side portions, and cover means removably secured to and closing said open U-shaped base pan means, said bottom portion of said base pan means having apertures therein at said intersections of said trenches and said distribution ducts for permitting direct access from said trench to the distribution duct and pan means below.