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Aug. '27, 1946. _ H. s. NAGIN STRUCTURAL MEMBER ' 2,406,557 Filed.v June 2, 1943 % 4 0° - _ INVENTOR HafJyS 2,406,557 Patented Aug. 27, 1946 UNITED STATES PATENT OFFICE 2,406,557 STRUCTURAL MEMBER Harry S. Nagin, McKeesport, Pa., assignor to Re liance Steel Products Company, McKeesport, Pa., a corporation of Pennsylvania ‘ Application June 2, 1943, Serial No. 489,330 1 Claim. 1 (CI. 94—30) > 2 My invention relates to structural members, and is particularly adapted to gratings and floors. suitable thickness. The platform ll between the bearer bars has been expanded from the condi The members are made from a single unitary tion shown in Figure 1, and resembles a sheet of metal shape. expanded metal which extends between the bearer It is customary to make gratings either by cast 5 bars IQ and is integral therewith. The portions ing, usually but not necessarily in one piece, or of the platform immediately overlying the bearer by fabricating the grating from rolled metallic bars have upstanding projections Ill’. The sec members. The latter method commonly includes tion from which the grating is formed is illus the use of longitudinal bearing bars secured in trated in Figure 1 which shows the section after spaced parallel relation by spaced cross bars 10 it has been rolled or extruded and slits 12' formed which are joined to the bearing bars by welding therein, but before it has been deformed. The or by deformation of parts of the bars. Another 1 expanding operation and suitable apparatus for type of grating includes spaced longitudinal bear performing this operation are well known to those skilled in the art and need not be explained'here. ing bars, secured to bent bars, portions of which extend between the bearing bars and usually are 15 The proportioning of the ribs ID, the spacing fastened thereto by riveting. thereof, the thickness of the platform I l and the vMy invention provides a structural member or size of the openings are matters of design. Suf grating which is made from a single member, ?ce it is to say that the sections can bedesi'gned which may be a rolled metal shape or an extruded . to carry loads of various magnitudes, depending metal shape. The rolled shape consists of a plat 20 on the conditions of use. '7 form which is substantially ?at and depending In FigureZa the grating’consists of spaced de spaced apart ?anges, narrow and relatively deep. pending bearer bars Illa and a connecting plat In one form of the grating, the platform between form I la, having opening therein. It is made the ?anges is slitted and then deformed so as to in the same manner as the grating shown in Fig form spaced apart openings, generally similar 25 ure 2 is made, except that the platform or top to the openings found in expanded metal sheet. In the expanding operation the portions of the platform between the ribs are widened, and con sequently the spacing between the ribs increased. portion is substantially ?at. This ?atness can be obtained in the operation of expanding the shape shown in Figure 1., or by subjecting the deformed portions of the platform of the grating shown in The ?anges or ribs are of sufficient depth and 30 Figure 2 tea ?attening operation such as for ex thickness to economically carry the load to which ample may be performed in a press. The section the member is subjected. When the member or may be formed without the projection l0’ shown grating is in use, the ?anges rest upon or are in Figures 1 and 2. secured to a suitable support, and the platform The grating made according to this invention is in contact with the traffic. 35 has the great advantage that it is formed from I also contemplate roughening the top of the a single section, so that there are no joints, welded platform by forming therein grooves, depression, or otherwise, to work loose. Such gratings are and projections. much cheaper to make than gratings heretofore The main object of the invention is to provide known. a unitary grating which is made from a single 40 While I have described presently preferred em- metal member formed either'by rolling or ex bodiments of my invention, it is apparent that the trusion. ' In the accompanying drawing wherein I have shown, for purposes of illustration only, certain preferred embodiments of my invention; Figure 1 is a perspective view of 'a suitable shape, which has been slitted but not expanded, Figure 2 is a sectional view of the shape shown invention can be otherwise embodied and prac tised within the scope of the following claim. I claim as my invention: An integral grated ?ooring structural panel comprising a rolled or extruded continuous ?at platform having integral therewith a plurality of more than two spaced, parallel disposed, solid, in Figure 1, after the shape has been expanded . ?anges depending from one surface only of said to form the completed member, and 50 ?at platform and serving as bearer ‘bars, said plat Figure 2a is a view similar to Figure 2 but show form being of uniform thickness between saidv ing the top portion of the member as being sub bearer bars, said platform being slit and expanded stantially ?at. between the said bearer bars to form a grating The grating shown in sectional view in Figure comprising a plurality of bearer bars with ex‘ 2 consists of a series of spaced apart substan 55 panded metal structure between said bars ‘and tially parallel bearer bars or ribs IU of suitable integrally connected therewith. dimensions which depend from a platform ll of HARRY S. NAGIN.