Gct. 3, 1946. ' . J. 5. SWANN 2,409,079 RAILWAY ‘CAR ROOF ‘STRUCTURE Filed April 2,‘ 1945 ' > 2 Sheets—$heet 1 4/ ZIII’IIIIMMIAIWIIIAYJI/Z \\\\\\\\\\\\\\\\\\\\\‘\\\\\,\\\\\\ INVENTOR. _ James 5 ?warzzz, Mu 3.» 19%‘ J. 5.‘ SWANN 1 2,409,079 RAILWAY cm ROOF STRUCTURE Filed April 2, 1945 - " " 5 ' 2 Sheets-She’et 2 INVEN T0R. Jcz/vzea 5 Jar/mm, BY Patented Oct. 8, 1946 ' 2,409,079 UNITED STATES PATENT OFFICE 2,409,079 RAILWAY CAR ROOF STRUCTURE James S. Swann, Homewood, Ill., assignor to Standard Railway Equipment Manufacturing Company, Chicago, 111., a corporation of Dela ware Application April 2, 1945, Serial No. 586,090 5 Claims. (01. IDS-5.4) I The invention relates to roofs for railway cars wherein a plurality of metallic roof sheets ex tend between the opposite side walls of the car and are formed to provide integral beams or re inforcements to transpose the load imposed there on to the side walls of the car. Such sheets are frequently joined together along their meeting edges or margins to provide additional beams or reinforcements. 2 tangularity of the car superstructure by resisting the tendency of the side walls to spread or come toward each other when the car is in service. These stresses are quite severe under coupling shocks. Such tendency puts beam stresses upon _the aforementioned beams or reinforcements. In the drawings: ' Fig. 1 shows a cross section of a railway car having a typical roof to which the invention is The invention is an improvement on a type 10 adaptable. It also shows my embossment in the roof sheet. of such roof now in general use, wherein the ad Fig. 2 is an enlarged section on line 2-2 of Fig. jacent margins of adjacent sheets are offset up 1 showing a joint between the sheets. wardly and such offset margins are provided with upwardly projecting ?anges and the ?anges of Fig. 3 is a cross section of another roof to which adjacent sheets are secured together by a cap my invention is adaptable, wherein the ?anges of or welding material. The o?set portions of ad adjacent sheets are secured together by a cap. jacent sheets and ?anges (and cap if used) co The roof sheet is also formed with a panel in the operate to form a reinforcement or beam between middle of the sheet. the side walls of the car. Such roof sheets are Fig. 4 shows a part of a roof sheet adjacent the generally also each formed with an upwardly apex and adjacent the offset margin with the projecting panel which is preferably midway be embossment formed in the sheet. tween the o?set portions and extends between Fig. 5 is similar to Fig. 4 with the embossment opposite side walls of the car so as to provide an omitted. other beam or reinforcement between the side Fig. 6 shows a part of a roof sheet adjacent the walls. apex, which sheet is formed with a panel and my Such roofs are necessarily pitched from oppo embossment. site sides of a central ridge to provide water sheds. In the form of the invention shown in Figs. 1, The ridge may be formed by bending the roof 2 and 4 each roof sheet 2 comprises a main por sheets on a line to form an apex, which apex tion 3 and an o?set marginal portion 4 in a plane may be eased by a radius, or the sheets may be 30 substantially parallel to the main portion, and an arched from side wall to side wall on a large inclined web 5 connecting the main portion 3 and radius. the o?set portion 4. The offset portions 4 are The object of the invention is to provide means joined to the adjacent roof sheet in any conven so that a roof sheet having parts thereof in spaced ient manner, such as upstanding ?anges 6 welded substantially parallel planes connected by a web 35 together (7) , as shown in Fig. 2. may be bent over a line or radius substantially normal to the web or transversely of the sheet without seriously concentrating the internal strains set up by such bending at one place or a small region. In other words, the object is to dis perse or distribute the strains over a large area of the sheets. Such internal strains may crack the plate or crack the galvanization, or other coating, while the sheet is being bent, or such Fig, 5 shows a roof sheet having a raised margin 4 bent to form a ridge 9 (but not having my em bossment) to show that when such a roof sheet is bent on a line (9) or radius the metal is com pressed and disrupted in the neighborhood of the points II and 52 because in that region the sheet is simultaneously bent on two lines at right angles to each other. Actual practice shows that strains may cooperate with stresses imposed on 45 in service roof sheets sometimes do crack in this region. the sheet after it is in service to crack the sheet. My invention comprises forming an embossment My invention is especially adapted to thin (as shown as 20 in Fig. 4) which springs from the metallic coated sheets, as thin sheets tend to main portion 3 of the sheet on opposite sides of buckle or tear when formed between reciprocal dies, and furthermore, such action tends to crack 50 the ridge 9 and merges into the web 5 on oppo site sides of the ridge 9, thus materially reducing a. coating, such as galvanization, therefore, an the angularity (2|, Fig. 2) between the main por other object is to provide a roof sheet which can tion 3 of the sheet and the web 5 and and conse be manufactured of very thin metallic sheet with quently eliminating the sharp bends shown as out localizing the strains. The roof of a railway car must preserve the rec 55 H and 12 in Fig. 5. Preferably the embossment 2,409,079 3 4 20 also merges into the offset portion, as shown l. A car roof sheet of thin metallic material in Fig. 4. having a main portion, an offset portion in a The ridge 25 of the embossment 20 is connected plane substantially parallel to said main portion, to the main part 3 and the web 5 of the portions and a, web connecting said portions, said portions 26, as shown in Fig. 4, which portions 26 are made ‘IR and said web being bent to form a ridge extend wide enough and long enough to distribute the ing transversely of said sheet, said sheet formed strains as heretofore mentioned. with an embossment springing from the ridge of On the line |4—-l5 of Fig. 4 and line I~B-—I'l said main portion and merging with the adjacent of Fig. 5 the Web 5 has an inclination of about 60 degrees (2| , Fig. 2) from the main portion 3 bf 10 ' the roof sheet, In my improved roof sheet hav ing the embossment 20 formed therein the in clination at the ridge 9 is decreased so that the angularity (22) between the main part 3 ‘and the ridge 25 of the embossment is materially de creased, thus distributing the strains, due to bending the roof sheet to form a ridge, and pre venting the concentration of the strains at points ll and/or 12. In other words, localization is pre vented. 20 edge of the ridge of the oifset portion and merg ing into said main portion and web on opposite sides of said ridge. 2. A car roof sheet of thin metallic material having a main portion, an offset portion in a plane vsubstantially parallel to said main portion, 3! formed therein incorporating my improvement. This panel extends between the side walls of the and a web connecting said portions, said portions and said web being bent to form a ridge extend ing transversely of said sheet, said sheet formed with an embossment extending from an edge of the ridge of the offset portion across said web and merging into said main portion and said web on opposite sides of said ridge. 3. A car roof sheet of thin metallic material having a. main portion, an offset portion in a car and constitutes a beam between said walls. plane substantially parallel to said main portion, Figs. 3 and 6 show a roof sheet having a panel In this modi?cation the sheet comprises main 25 and a web connecting said portions, said portions portions 3!], panels 3| connected by webs 32, all and said web being bent to form a ridge extend of which are bent across a line forming the ridge ing transversely of said sheet, said sheet formed 33. The embossment 34 has a ridge 35 connected with an embossment which springs from said to the main part 30 and the web 32 by the portion main portion on opposite sides of said ridge and 36, all similar to the embossment 2U heretofore v30 merges into said web adjacent opposite sides of described. the ridges thereof. While I have shown in the drawings the sheet 4. A roof sheet as de?ned in claim 3 wherein formed in a plurality of ?at planes connected by said embossment extends to and merges into the sharp angles for simplicity, it is understood that adjacent edge of the ridge of said oifset portion. the various parts may be formed on curves con 35 5. A metallic roof sheet having ends adapted nected by radii and still come within the scope of to :be supported by the side walls of a railway the invention. car; said roof sheet having a panel formed there Also while I have described the invention as in extending substantially between the ends of applicable to a roof sheet it is obvious that the the sheet to provide a beam between the side walls same could be employed in any sheet wherein 40 of the car, said panel comprising an offset por similar conditions exist and wherever used. tion connected by webs to the sheet, said sheet The accompanying drawings illustrate the pre and said panel being bent to form a ridge extend ferred form of the invention, though it is to be ing transversely of said sheet, said sheet being understood that the invention is not limited to formed with an embossment on each side of said the exact details of construction shown and de panel, each embossment springing from the ridge scribed, as it is obvious that various modi?cations of said sheet and merging with the adjacent edge thereof, within the scope of the claims, will occur of the panel and also merging into said sheet and to persons skilled in the art. web on opposite sides of said ridge. I claim: JAMES S. SWANN.