Abstract: A lightweight, strong, economically-manufactured, and safely transportable modular unified floor assembly includes a lengthwise wooden girder beam formed with male and female ends to facilitate cooperative integration thereby to another similar floor assembly. In another aspect of the invention, the floor assembly is manufactured with a stairwell opening of selected size and at a selected location. The floor assembly even with a stairwell opening according to this invention is strong enough to be transported comfortably and safely from its point of manufacture to the site at which it is to be located for use.

Abstract: A towable unified floor frame assembly derives lengthwise strength from two elongate I-beams disposed symmetrically about a longitudinal axis. The I-beams are separated by a plurality of angle-sectioned metal cross members welded therebetween. A plurality of trusses, corresponding in number and location to the metal cross members, is disposed to support an outer perimeter and a floor thereabove. Each truss incorporates upwardly inclined bracing elements located outwardly of the I-beams connected to flat metal connecting elements individually unified to the I-beams, preferably by welding. A waterproof and dirt-excluding cover entirely covers the underneath of the floor frame assembly. Heating and ventilating ducts, power and telephone wires, water and waste pipes, thermal insulation and the like, are installed within the floor frame assembly.

Abstract: A unified floor frame assembly has two elongate outer load-supporting beams formed of wooden elongate beam sections that may be selected to have different vertical cross-sectional dimensions and, optionally with two thicknesses united, are butt-spliced to be cambered in parallel vertical planes to counter forces that may tend to cause sagging of the floor frame assembly during transportation. A wheel carrier assembly is detachably mountable thereto with a plurality of wheels partially recessed within the floor frame assembly and a towing hitch assembly is attachable to a forward end of the floor frame assembly for applying a towing force thereat. Wooden I-beams are used as transverse frame members to provide lightweight strength and floor frame widths of the order of 18 ft. to 20 ft.

Abstract: A unified floor frame assembly has two elongate outer load supporting beams formed of elongate beam sections that are butt-spliced to be cambered in parallel vertical planes to counter forces that may tend to cause sagging of the floor frame assembly during transportation. At inner vertical perimeter surfaces of the elongate beams are provided attachment plates for attachment, first, of a wheel carrier assembly detachably mountable thereto with a plurality of wheels partially recessed within the floor frame assembly and, second, a towing hitch assembly attachable to a forward end of the floor frame assembly for applying a towing force thereat. A moisture, dirt, insect and pest excluding thin covering is provided underneath the floor frame assembly and sections of heating and ventilating ducting, piping, wiring and the like are includable during manufacture of the floor frame assembly.

Abstract: A floor frame assembly, formed principally of wood material, has two load-bearing outer beams and front and rear end members defining a periphery and a plurality of transverse load-supporting trusses connected normal to the outer beam between the end members. In a preferred embodiment, each truss has an upper elongate member, a shorter central elongate member attached parallel thereto by vertical cross-braced elements, and on either side of the central member a braced vertical member spaced therefrom to provide gaps of predetermined height and width. Each truss also has an end portion of the upper elongate member in cantilever form for contact thereat with a load-supporting surface at the permanent location of the floor assembly, so that additional external beams or continuous wall surfaces to support the completed floor frame assembly and any superstructure thereon is rendered unnecessary.