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Nov. 19, .1946. H. w. DODSON 2,411,149 CLOSURE FOR SHEET-METAL CONTAINER OPENINGS Original Filed July 20, 1939 2 Sheets-Sheet 1 . .. r . ..~ . . A _. V. n .. \u ..\ . _ . V ‘. n _ .. . . . . . . . . . . . .“ . , . . . . . . . . _ . . _ . . . , . . . . _ . . . \ .V \\.. 1. 1NVENTOR; HOWARDW Doosou BY 56 A ' ORNEY, Nov. 19, 1946. H. w. DODSON ' 2,411,149 CLOSURE FOR SHEET-METAL CONTAINER OPENINGS Original Filed July 20, 1939 2 Sheets-Sheet 2 ' \ ,.....,...\.\ 80 INVENTOR. HOWARD V D0050»: BY %4@ A ' ‘ ORNEY. Patented Nov. 19, 1946 2,411,149 ‘ ‘UNITED STATES PATENT OFFICE 2,411,149 ‘I CLOSURE FOR SHEET-lVlETAL CONTAINER OPENINGS Howard W. Dodson, Philadelphia, Pa., assignor to United Steel Barrel Company, Philadelphia, Pa., a corporation of Pennsylvania Original application July 20, 1939, Serial: No. 285,477. Divided and this application August 12, 1943, Serial No. 498,289 ' 1 Claim. ’ (Cl. 220—39) 1 The present invention relates to certain new and useful closures for sheet-metal containers such as steel drums and the like, and it relates more particularly to certain constructions in the openings and the closures therefor whereby said steel or other sheet metal containers may be emptied and re?lled. 2 r of the container is designated generally 'by the , numeral 20 in all the ?gures. In the embodiment of the invention shown in Figure 1, the sheet metal of the wall 20 is pro vided with a suitable hole, and the sheet metal is then ?anged inwardly around the hole as shown in Figure 2 to provide. a more or less For the purpose of illustrating the invention, cylindrical ?ange 2| formed integrally with the there are shown in the accompanying drawings sheet metal of the wall 20. Intermediate the forms thereof which are at present preferred, 10 more or less cylindrical ?ange 2| and the main since the same have been found in practice to body portion 20, the sheet metal is also prefer give satisfactory and reliable results, although it ably provided with a generally annular rib-like is to be understood that the various instrumen~ talities of which the invention consists can be depression 22 or elevation 23 (in the form of con struction shown in Figure 1, it is in the form variously arranged and organized and that the 15 of a depression while in the form of construc invention is not limited to the precise arrange_ tion shown in Figure 3, it is an elevation). A ment and organization of the instrumentalities generally flat annular gasket-seat 24 surrounds as herein shown and described. the ‘?ange 2| in the embodiment of Figure 1 The present application is a division of my while a generally ?at annular gasket-seat 36 application Serial No. 285,477, ?led July 20, 1939, 20 surrounds the flange 2| in the embodiment of which issued into Patent 2,343,286, on March 7, Figures 3 and 4. _ 1944. The annular ribs 22 and 23 serve as a sti?fening In the accompanying drawings, in which like reference characters indicate like parts, reinforcement around the opening de?ned by the generally cylindrical ?ange 2| and also Figure 1 represents a cross-sectional perspec 26 around the generally flat annular gasket-seat 24 tive view of one form of construction embody-v which surrounds the generally annular ?ange 2| ing the present invention. in the embodiment of Figure 1 or around the Figure 2 represents a fragmentary cross-sec ?ange~base portions 25 in the forms of construc tional perspective view of the container of Figure tion shown in Figures 3 and 5; all the above 30 1 as it appears in an intermediate stage of con named portions, namely the ?ange 2|, the gasket struction. ' Figure 3 represents a cross-sectional perspec tive view of another embodiment of the present invention. . Figure 4 represents a fragmentary cross-sec tional perspective view of still another form of seat 24 and the reinforcing ribs 22 or 23 and ?ange-base 25, being formed integrally with each _ other and drawn or pressed out of the same metal as that of which the body 20 is formed. 35 The sheet metal 20 may beof 12 to 26 gauge construction embodying the present invention. sheet-steel. The ?ange 2| is then threaded by means of Figure 5 represents a cross-sectional perspec tive view of still another form of construction two or more coacting thread-forming rolls (of the form well known in the art) by means of tion. of tin cans, in that the rolled thread on tin canned 40 which the metal of the ?ange 2|, which is ini embodying the present invention. Figure 6 represents a sectional perspective view tially in the form shown in Figure 2, is de-iormed showing another embodiment of the present in in such a way that a thread 26 of the character vention. shown in Figure 1 is produced. This thread (26) Figure '7 represents a sectional perspective view 45 differs essentially from the rounded-cross-section thread commonly rolled onto the discharge spout of still another embodiment of the present inven ' ?anges is produced merely by bending the sheet Figure 8 represents a sectional perspective view of a further embodiment of the present invention. metal, whereas the thread 26 hereinabove indi In the drawings, only a fragmentary portion of 50 cated is produced by an actual deformation or ?owing of the comparatively heavy gauged sheet~ one of the sheet~metal walls of the sheet-metal steel under the pressure of the thread-forming container is shown; it being understood that this sheet-metal wall is generally an end wall of a more or less cylindrical container, although it may be a side wall also. The sheet-metal wall rolls, to form a more or less sharp thread. A plug 21 of cast metal or die-cast metal, or a plug, like plugs 28, 29, 30 or 32, pressed out of 9,411,149 ' 3 . ' I 4 direction so as to prevent its spreading unduly and thereby loosening the “see-1;” ,with a cut thread 33 as in Figure l and with a The relationship of the gasket-con?ning rolled thread 34 ,as in Figures 3, 4, 5, 6, 7 and 8 ?anges BI and 53 might be either that indi (formed in the same manner as the thread 28), cated in Figures 3 and 7, where the ?ange ex corresponding generally to the thread 28 of the tends below the gasket-seat 24 or 38, or it may ?ange 2|, and having a laterally extending ?ange be that illustrated in Figure‘5 where it extends 35, in juxtaposition to the gasket-seats 24 and only down to the depth of the gasket 31. The 38 and adapted to engage the annular sealing gasket-con?ning ?anges may also be provided on gasket 31 between itself and the gasket-seats 24 and’ 36, respectively, so as to form a ?uid 10 the cast plugs, such as the cast plugs 21 indicated in Figure 1, by merely extending the cast metal tight seal. The cavity 33 in the plug 21 may be of portions downwardly, that is, by extending a any suitable non-circular cross-section, as for downward gasket-con?ning ?ange from the lat instance, square, hexagonal, or triangular, for the eral ?ange 33 at a diametral point just su?lcient reception of a wrench or other instrument by 15 to clear the outer diameter of the gasket 31. means of which the plug may be turned. In the form of construction shown in Figure 6, In the form of construction shown-in Figure 1, the axial distance or axial extent of bung-?ange the annular wall. portion 45 of the annular rein 2| and of the threaded portion of the plug may forcing rib 22 (that is, the portion of the sheet be so related or proportioned as to be substan metal wall directly adjacent to the gasket-seat sheet’ metal is provided with a cast thread or 24) is turned or formed or spun inwardly slightly 20 tially equal, thereby permitting the interposition of a second sealing gasket 55 between the lower so as to form a shoulder against which the ?ange periphery of the threaded portion 34 of the plug 46 of a thin sheet-metal tamper-proo?ng cap 34 and the ?ange-base 'portion2i, as indicated in may be crimped inwardly, so as to prevent the Figure 6. . ' removal of the plug 21 without detection. The tamper-resistant cap 58, shown in Figure In the embodiment of the invention shown in 25 3, may be crimped inwardly against the outer Figures 3 and 4, the annular reinforcing bead or surface of the threaded ?ange 2| as at 51. As rib 23 is raised upwardly intermediate the main shown in Figure 3, the cap 56 (which is of read body portion 23 of the sheet-metal wall of .the ily-deformable material such as very thin sheet container and the annular portion 25 which forms a base for the upwardly extended bung 30 metal or the like) is somewhat over-size relative to the bung 28 so that an annular radial clear ance is provided therebetween; it being impos ?ange 2| in the form of construction shown in Figures 3 and 4 (and also for the form of con sible to remove the cap 58 from about the bung struction shown in Figure 6). opening without substantial deformation of said The bung-?ange 2|, in the forms of construc tion shown in Figures 3 and 6, is extended up 35 cap. In Figures 5 and 6, two further alternative forms of tamper-resistant cap arrangement are wardly from the basal portion 25, and can be ter shown. In Figure 5, the tamper-resistant cap 58 minated in a more or less sharp or ?attened edge is an outwardly ?ared skirt portion 59 which is 36 constituting a gasket-seat as in Figures 3, 6 adapted to be snapped into or to be spread out and 7. _ . It should be understood the the screw-thread 40 into ‘the annular inwardly enlarged portion 80 formed intermediate the inclined portion 8| and on the bung-?ange 2|, in each of the modi?ca the main body portion 20 of the sheet metal of tions shownin Figures 3, 4, 5, 6, 7 and 8, is formed The tamper-resistant cup 62 container. shown in Figure 6 (likwise formed of thin sheet tion or swaging the metal into the screw-thread 45 metal) is on the other hand provided with the inwardly crimped skirt 63 which is crimped formation. around the undercut outer shoulder 64 of the The pressed or stamped sheet-metal plugs 28, raised rib 23. . 29, 30, 3| and 32 are formed in generally cup In the form of construction shown in Figure 7, shape; the plugs 28, 29, 3| and 32 being “cupped” in the same manner as hereinabove indicated with . the respect to Figures 1 and 2, namely, by deforma generally downwardly while the plug 30 is cupped 50 the down-turned ?ange 53 of the plug is also threaded to engage one or more turns of the generally upwardly. A transverse rib 48 may be pressed out of the central or more or less ?at'por thread 28 of the bung-?ange 2 | . In Figure 8, there is shown another embodi- . tion of the cup-shaped plugs 28, 29 and 30, either ment of the present invention in which the stiff extending entirely across the diameter thereof, or extending only across a part of the diameter 55 ening rib 23 is pressed outwardly and surrounds the gasket-seat 24; the rib 23 serving radially to thereof, whereby the plug may be engaged by a con?ne the gasket 31 when the latter is com suitable tool such as a, wrench, pliers or the like, pressed by the shoulder 35 of the plug 29. The or as in the case of the rib 49 in Figure 6, it may inwardly crimped skirt 83 of the tamper-resistant be engaged by any ?at object such as a wide screw driver or any ?at piece of metal. If desired, a 60 cap 62 is crimped around the undercut ‘outer shoulder 34 of the rib 23 as in the embodiment solid metallic rib 50 may be extended across the of Figure 6. ?at part of the plug and spot-welded thereto or It ‘will be understood that the various fea otherwise secured thereto, for the same purpose tures illustrated in the several ?gures of draw as in the plug 32 of Figure 7. ings may be interchanged with the correspond The plugs 28, 29,, 30 and 32 may also be pro 65 ing features shown in modi?cations illustrated in vided with gasket-con?ning ?anges, as for in other ?gures of the drawings. ' stance, the annular ?anges 5| shown in Figures The present invention may be embodied in 3 and 5, or by the inwardly crimped ?ange 53 other speci?c forms without departing from the shown in Figure 'l, or, as in the case of the type 70 spirit or essential, attributes thereof, and it is of plug 30 shown in Figure 6, the central part of the plug may be depressed to form the inner gasket-con?ning ?ange 54; By this means, the gasket 31 is not only con?ned in a generally axial direction, but is also con?ned in a generally radial 75 therefore desired that the present embodiments be considered in all respects as illustrative and not restrictive, reference being had to the ap pended claim rather than to the foregoing de scription to indicate the scope of the invention. 2,411,149 ' 5 Having thus described the invention, what I claim as new and desire to protect by Letters Patent is: ' In a sheet metal container, 9. generally cylin drical bung-?ange drawn integrally from said container and de?ning an opening in a wall there of, said bung-?ange extending outwardly from 6 threads or said bung-?ange, said bung having an annular transversely-extending shoulder formed thereon for compressing said gasket upon said gasket-seat, said shoulder having an annular ?ange formed thereon for enclosing said gasket seat and for con?ning said gasket therewithin, and an over-size tamper-resistant cap of readily deformable material ?tted over said bung and said wall and providing a gasket seat at its outer 7 end, said bung-?ange being helicaliy corrugated said bung-?ange and generally spaced apart to provide an internal screw-thread and an ex 10 therefrom, said cap being crimped against the ex ternal screw-thread thereon, an annular gasket ternal screw threads or said bung-?ange and disposed upon said gasket-seat, a screw-threaded bung operatively engaged with the internal screw being incapable of removal without deformation. HOWARD W. DODSON.