Abstract: An improved cold formed, sheet metal profiled building unit and method of making the same are disclosed. The building unit incorporates at least one longitudinal stiffening rib in a longitudinal flat region of the type having a tendency to buckle when subjected to compressive forces. The longitudinal stiffening rib is formed not by drawing-in sheet metal as in current roll forming practices, but, instead, by stretching a segment of the sheet metal. Each longitudinal rib has a profile width, as measured along the centerline of the rib, which is greater than the linear of the sheet metal segment from which it was stretched-in. Roll forming machines incorporating the principles of this invention utilize fewer roll stands than do roll forming machines incorporating the principles of current roll forming practices.

Abstract: An improved cold formed, sheet metal profiled building unit and method of making the same are disclosed. The building unit incorporates at least one longitudinal stiffening rib in a longitudinal flat region of the type having a tendency to buckle when subjected to compressive forces. The longitudinal stiffening rib is formed not by drawing-in sheet metal as in current roll forming practices, but, instead, by stretching a segment of the sheet metal. Each longitudinal rib has a profile width, as measured along the centerline of the rib, which is greater than the linear of the sheet metal segment from which it was stretched-in. Roll forming machines incorporating the principles of this invention utilize fewer roll stands than do roll forming machines incorporating the principles of current roll forming practices.

Abstract: A raceway forming member for use with a cellular or non-cellular flooring unit having at least two longitudinal, spaced-apart, inverted channels connected by a web to define a trough therebetween. The raceway forming member comprises a longitudinal cover element sized to span the trough at a selected upper point of said channels and having edge means adapted to abut said channels, and at least one longitudinal separator member depending from and coextensive in length with said cover element to define at least two cell raceway.

Abstract: Apparatus for fireproofing an underfloor access chamber of an electrical wiring distributing floor structure. The access chamber is formed between a cellular unit and a covering layer of concrete. The access chamber has at least one inlet opening communicating with a raceway presented by the cellular unit; and an outlet opening providing access to the chamber from the space above the concrete. An unobtrusive strip of fire-resistant material, disposed within the chamber, covers substantially entirely all of the bottom portion and obstructs the inlet opening. The strip shields the upper portion of the chamber from heat transfer by convection and by radiation. Slit means formed in the strip allows passage of wiring without significantly deteriorating obstruction of the inlet opening.

Abstract: An electrical activating assembly provides a flush-with-the-surface electrical receptacle. The assembly includes a closure member providing access to a simplex or duplex receptacle supported by a support plate substantially flush with a barrier upper surface. The closure member includes a perimeter bead extending upwardly from the member upper face to provide a cover socket. A cover fitting within the cover socket is pivotally and removably connected to the perimeter bead for access to the receptacle. An alternative closure member is disclosed for use with a high voltage simplex receptacle. A cover fits within the cover socket, is secured to the receptacle, and includes an access opening exposing the outlet.

Abstract: 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.