Floor structure for cargo container

Claim 1

In a portable cargo carrying container for use in storing and transporting freight, a metal floor structure for said container comprising, a rigid rectangular metal frame member including side and end rails, a plurality of elongated relatively stiff metal cross-members laterally spaced apart at intervals along the length of said side rails, said cross-members each provided with a web portion having its marginal side edge portions depressed below its top level by a predetermined amount, a wall depending from each depressed side edge of the web portion, a plurality of elongated metal plate members, each located between a pair of adjacent spaced apart cross-members and welded at its side edges to the depressed marginal edge portions of the web portions, the thickness of said plate members being substantially equal to the amount by which the marginal side edge portion of a web portion is depressed, said side rails each including a vertical wall, the end edges of said plate members of said web members and of the depending walls of the web portion abutting the vertical wall and being welded thereto, to secure said plate members, cross-members and side rails together into a unitary selfcontained structure free of external fastening devices and/or overlapping portions of materials.