[1]Patented Feb. 39 1942 2t27lt762 UNITED STATIE@S PAT,'ENT @OFFICE METHOD OF MAKING,BUNG OPENI[NGS Charles T. Draper, Cleveland Heights Ohlo,@ss-; signor to The Diaper Manufaci company" Cleveland, Ohio,: a corporation of Ohio Application Dec@mber 16,1938, $erW No. 246 119 9 Claims. (Cl. 29-148.2) The @invention relates generally to bung open- It i@ a further object of the present Invention ings for, met provide a method, for makin an liiteg'ral bung alile contai,.iers, barrels, drums, vesto 9 , sels. packages and the like, utilized for shipping, openirig nec.k in a wall of: a metallic container f6ui to t,@velve gau . ge r6lied storing, and dispensing fluid, liquid or'semisolid formed frorii twent materials; and relates more particularly to the 5 steel with internal a@d exteriial roller sw I aged manufacture of a threaded containerbung openthread foriiiations. one 6t which is a standard ing neck integrally in a single sheet metal blank pipe thread. by drawing, rolling and metal working operait' i@ likewise an co@ject of th@ present invention method . of tions. to provide' making an outwardly Metallic containers heretofore have been proit) projecting in.tegral bung opening neck in a sheet vided almost:um'versally with cgst, forged or spemetal container wall terminating in ah,6uttumed cially pressed bung rings or bushings having inflange -and having iriner and outer pipe thread temal threads; the bung rin ati gs being sedured in fo.rm ons in the neck bet*een the,wau and a liquid-tight manner by. seamihg, welding, or flange, one of which i I s a standard pipe thread. the like,: to the container wall. Or I dinarily, 1 5 Moreover, it@ is an object of the present inventhreads are cut in the bung rmgs @or bushin s tion to provide a m6thod of making an outwardly @ g before the same are secured to the c6ntainer - projecting bung opening,neck terminating in an wall. outturned flange integrally in a sh6et iiietal conThe manufacture of such bun rihgs , the tainer wall having @an internal standard pipe @ 9 threading of the same, and the securing ;'f the 20 thread formation in.th6 ri@ck between the wall bung rings to the container wall, are each relaand flange. tively expensive o@erations, aldding materi,@ally to It is also an object of the@i,.)res,ent invlention to the cost of manufacturing metallic containers, i@rovide a metho.d of making an outwardly proMoreover, with prior construttions, it is frejecting bung @ oppriing neck integral with' a.sheet quently necessary to utilize @two or more gi)@kets 25 m6tal coritainer wall and teriiiinating in a flange, in order to assure a liquid-tight closur@ between hav'mg tiireads fornied in the neck between the the bung opening and plug, and at the place of wall and flange disposed from the neck ooposecurement between the bung ring and the consit@ly from the direction in which the I flange tain6r waU. extends. I have developed an entirely new type of, in3(l Moreover, it is an object of the present inventegral threaded bung opening for a metallic conI tion to provide a m6thod of making an' outwardly ,tainer by providing a sheet I I I Iing threaded bung, openin neck integral metal wall c)f a conproject 9. tainer with @an integral tubular neck having inwith a sheet-metal container wall in which the ternal and. external V-'sided threads formed metal in the neck wall @Ls swagpd deformed cold therein, one of which Is a standard pipe - thread, .3 r, rolled, ..ironed,, burnished,, spun, 'stretched, and the metal forming the internal and extemal 'SM60th@d and hardened@ by working between rollthreads being internaily and externauy roller 'er dies to thicken th6, same at di@fferent regions ding for providing V sided pipe threads 'm said neck swaged thr'oughout as shown in niy co-pen ication. Serial No. 181 75 filed December 27, wall,, one of which is a stanclurd 1)ipe thread. PPI 18 1 :1937 (Patent No. 2,156,237); 'and the threading 40 Mbreover, it@is an object of the pre@erlt 'mvenof such a neck niay- be carried out on apparatu@ tion t6 Provide a method of making a container such as disclosed in my co-pending@ application, bung opening -construction having characteristics Serial No. 181,874,' M@d December 27', @1937 (Patdesciibed W. olie or inore of the @receding Ob6nt No. 2,145,587). @Jects, and which is adapted to receive any @ one It is desir'able, if not necessary, that such en 4.ls of a numbet of dffferent iyi*s 6f closure pliigs Integral threaded ni@dk be provided with a flange at its outer end, not only for seating a liquidtight sealing gasket between the same and a lapping part of a closure plug, but also for providing s should6r for securing a tamper sealing cap to the container closure construction. It is therefore a primary object of the present invention to,reduce the cost of manufacturing metawc containers by greatly, reducing the:eost pf providing bung openings therefor, Provlded with, standard pide tjii6ads. Also, it Is an object of the present invention to @provide a method of making a cont@@er @ung @opening constriietion ha@ing charieteristics de5(i fined in. one or more of the above bbjects, tb which a tamper-seal may be readily applied. These and other-oblects and advantages a I pparent to those skuled in the art fro @ th foim e lowing description and claims may be attained 55 by the inethods, method steps @nd o@ere@tioris of
[2]making a bung opening hereinafter met forth In detall and claimed, preferred steps of which are shown in the accompanying drawings, and'which may be stated in general terms as including, drawing a sheet metal blank to form an Integral 5 neck prbiecting therefrom defining an opening; forming an lnternel standard pipe thread in said neck preferably @ by- working, swaging, deforming, cold rouing, @ burnishing, stretdhing, displacing, smoothing and hardening the metall in'the neck io ent regions; and then 'fo ing an outtumed flange at. the outer end . of said@ threaded neck spaced f-rom the wall from which the Lneck proin which an improved integral threaded bung opening neck is to be formed, the location Lof such a ndek being Indicated, for example, by 20 dot-dash lines; Mg. 2 Is an enlarged vertical section through the flat sheet metal blank shown in Plig. 1; Fig. 3 is a v al section similar to Fig. 2 after a-'@cup drawing operation has been Per- 2.5 formed on the blank of Plig. 1; Mg. 4 illustrates a , combined drawing and punching bpm6ration performed on the cupped blank of Mg. 3 to provide 6,n integral neck deR13Li]U a bmg opening; 30 Flg. 5 is a siniilar view illustrating the Op'eration of roller swaging intemal' and extemal Vsided pipe threads, one of which is a standard pipe thread, irx the integral neck shown irx FU. 4, between -the sheet nietal wall and the end of the 3.5 neck; Plg. 6 illustrates an operation of forming, rolling or turning an outwardly projecting annular flange at the end of the threaded neck shown in Fig. 5; 40 Mg. 7 illustrates a slightly modified form Of construction in L which a flanged sleeve is slipped over the threaded neck of Mg. 5 and is thereafter secured to the sheet metal wall by forming, roll9,271,702 such as disclosed in my copendiw application Serial No. 181,874, matured in Ti. S. Iietters Patent No. 2,145,587 as by telescoping the neck 13 (Flg. 5) over a roller die 14 provided with a threaded annular surface having. a standard pipe thread form. Another similar oppo4tely threaded roller die I 5 may then be moved - radially toward roller die 14 and at the same, tinie the axis of rouer the 15 may be iotated.abotit the neck and about the axis of roller die 14 so as to swage, between roller dies to twcken the same at differ-'. @ @.deform, cold roll, iron, bumish, spin, stretch, smooth, harden and work the zone of metal indicated @at :I 6 between the roller dies 14 and 15 to prov,ide V-sided,pipe threads II in the zone II of Jects' after the neck has been threaded. @15 said:@ neck 13 which is atiffined and str.engthened In the accompanyibg drawings by the cold working and :the provision -of FUue 1 is a plan view of a sheet metal blank threads. The working operation thickens the threaded neck wall in various regions so that the thickness of the swaged metal In the thread apices is greater In a diametrical directioni than the thickness of Lth'e ' swaged @ metal In the side waU of a thread common to both the internal and external thread surfaces. The movement of the roller the 15 radially toward the rober the IL4 owes the metal in the neck 13 being worked under considerable pfessure; and suincient pressure is applied aAd maintained and the cold rolling and ironing operation is carried 6ut for a sufficient nmber @ of revolutions that accurate V shape pipe threadt are formed. As a resiilt the thread-formationSL present very smooth, cold rolled surfaces which will not seize, even if the threaded neck is formed in a steel sheet and another threaded steel@member la engaged with the threaded nec]L moreover, as shown in iiig. 5, the Internal threaded surface L has a@ standard pipe thread formation and the intemal threads project inWardly of the location of the, zone II of the neck *an prior to being threaded' Thlis, the improved method provides for forming standard PiPe threads in the thin sheet metsl neck wall 13 iiit6gral with the blank wall IO withing or tuming an outturned flange on the neck; 4.5, Out cutting the metal; which prodUCt is diSclOged and in niy copending application Serial No. 181,875. After the threads 11 have been rolled in:the zoile I 6 I of the I neck 13 the sheet'metal blank;10 may be further workea to form, turn or roll an outtumed flange II (Eng. 6) at the outer end of the threaded neck 13 as by engaging a roller 19 3 and m g a cooperating roller against neck i ovin .20 radially toward roller i9. The flange II thus foms an abutznent against may be desired to foi@in a bung opening in either r) - wh'ch a liquid sealing igsket MaY be clamped by or both of a barrel head or side w9M aS b@r loc@ting 4 plosure plug threaded into the threaded bung the same in the blank I 0 in the position indicat@d opening neck;, and the fange i 8, may also be enby dot-dash lines at I I In Fig. 1. gaged by a tamper-sealing cap for sealini the Ulustrated in said ill 60 copending product applic&tion Serial No. 181,875. (Mg. 3) at the location lncitcated at I I in @vlig. i, after which the Bheet MetLIL blank I 0 cupped at In some cases it maY be deSiMble to extend a 12 may be furt,'Aer formed by a succeeding opera- flange butward considerably further than shown tion in suitably shaped drawing and piercing dies n Flg. 6 and it may Ilkewise be desirable @to, proto draw the neck 13 (Mg. 4) aud punch c@ut a cen-' vide a shoulder on the -top surfacle of. the: flange. ter disk (not shown) so that I the neck 13 delftnes (15 This may be accomplished as shown in Plgs. 7 a bung opening in the sheet metal blarik I 0. The an(I 8 by telescoping a flanged ring 21 around invention, however, is not limited to the specific the threaded neck 13 (M. 7), and then rolung, .forining or tuming flange II. as shown in Plg. 8, number and cl,.aracter of drawing operations used 1 I I so as to clamp the flanged ring 21 between flange to form the integral neck 13 as these may be var- 70 ied in accordance with usual practice, depending .1 8 and wail I 0. Thus, the nange at the outer end upon the size and proportions of the opening, and ' Of the threaded neck Is in effect, extended out.w 9 , on the properlties of the sheet metal blank and on ard farther by flange 22 of Lflanged rin 2 1, and the results desired. flange IS and ftange 2 2 cooperate to form a shOUlThe neck 13 may then be threaded in apparatus; 75 der 23, wh'ch is an exceedingly advantageous Fig. 8 iuustrates the operation of forming a flange on the threaded neck of Flg. 7 to sedure the flange extending ring thereto. SimHar, nil-erals refer to sim.ilar parts 50 throughout the various flguies of the drawings. . A sheet metal blank indicated at 10 in Fig. 1, which may be.the blank from which either'a b@ead or side waU of a metahic barrel is formed; and it The blank IO may be introduced between suitclosure construrtion , &U Eibly shaped draw dies to draw a cup 12 there
[3].form of abutment against which a liquid seau" ouket mi@y be@clams)ed. Thus, the impr6ved'3nethoa pro@ides ii6t only for formizig a threaded bung 6pe@ing@ neck' integr&Uy in a sheet metal *aU I)ut aisci pio@ides"for b'@ locating such an lnt@grea thteaded @neek eceentricauy in a sheet metal wall as iii&cated at I I in pig. 1. Moreover, the improved method provides for the fo.rmation of Internal and extemal roller io swaged thread formations, one of wbicu is a standard pipe thread, in a neck integral *Ith a, sheet metal waU. In addition. the Improved method provides for the mnufacture of a threaded bung openft neck 15 terminating in an o uttumed flange integrally. In a abeet inetal wall Thus the present improvement s appreciably re - duce the cost of providing bung openings for meIn 16, shoot,,Inetal wi%U to defte in ovenint thereatiriiur@:izd:@intenmuy roller swagft a zone of Wd neck. to form external Lnd:internal miiooth v@@@ads therein, iiiid.then formlng an outtumed ftnge@oft@Bgd neek@Bpeced from.mdd wan. 2. Thi6 iiiidthod-of@ Kirin ail, inte" threaded ftm6d@ bung opening@ neek'izi- i sheet @iiietel wall Including the steps of drawing an &=ular, neck in &;sheet metal@w&U to defli@e an openmg theri6In. displacing a zone 6f -the 1 metal Jn aid neck by extemauy and Internally swaging the same between roller:dia to form external and lnter@ V_Sded ppe thre&da therein, one of wbich ii a standard Pipe t-hnad, and then forniing an outon "L, tumed said neck spaced frora aWd wan, 3. The method of @makin& a threaded flanged bung opening neck in a sheet metal wall in tauic containers and therefore appreciably rego cluding the steps In the order named of drawduce the cost of manufacturing such metallit :an inte" annul metal llig ar, neck in a sheet L containers; and the present improvements Over- wall to define an opening thereii4 formlng come the dimculties and eliminate many of the threads in @ said neck, placing a nmged rjnt on ezjwnsive and compucated operations involved in sOd neck, and then forming an outtumed Jlange ttie prior practice of making and securing, bung d neck and simigtaneously securing said 23@ on sai ring flanged thereto. 4.@ The method of making a threaded fianged bung opening neck in a sheet metal wall including the steps th the order named of drawiug an iritegral annliar: neck in a sheet metal I wag to define an opening in; there forming threads in ssid neck, placing a ring having a fumge at the outer end@i thereof about wAd neck, :and then tuming a ftange at'the outer'end of aid neck and siinultaneously samtting and clamping the same agaimt the ring fiange. 5. The Me t h o d O f m a k t u e i i i n t e g r a l t h r e a d e d @ @@bung opening neck in Sheet Met&l W&ll including the steps of - drawing an amui ar neck In La sheet met&IL W&B to define an -opening therein. deforming a zone of'the metal in said neck to tbicken the asme in different regiona bv ext emallv and lntemaby swaong and working@ the same between roher dies to form external and intemal V-sided pipe threads, therein, one of which Is a standard pipe thread, and th fo 0 en rmIng gm outturned :flange on, said neck spaced from said wall. 6. The method of making an integral threaded are Intended to refer to the various standard DiPe 5o bung - opening,neck In a sheet metal wsll includ@f ing the steps drawing a]a annular neck Lin a sheet metal wall to define@- --au openft therein; displacing a zone of the t&l inwardly of said me neck b*. extemauy,L and intern&Uy SW&ging and workim the metal between@ rolier dies to form e3tWrtW and intemal V-sidqo pip@L threads In S&id neck, the internd threo& being standard pip-6 t hreoas Projecting inwardly of mdd neck; and then fonning sn OuttUrUed flange ori said nwk imaced from mad waii 7. 'Me Met hod of making'94 Integral threaded fi=ged bung openft lieck In- p6 sheet metal wan including the steps of drawing an a=ular n I mk mmutlicaUY in a sheet metal blank to denne an openbw ttierein.: extem&U and y i n u m a n y rOUer xwgging a zone of mdd neck t46 forrd externsl &nd intemal smooth V_threads therein, and then fomitng an outturned flange ;on.the outer end of old beck. S. The meth od of maki ng an inuv@al threaded bunff opening:neck in a sheet metal wall including the steps of, dmwing = wmult%r neck 6ccerLUUMW in a 3heet,metal WaU to: deftne an openft ther ein, and then exte rnad y and lnter - Including the 3teps of drawing an annular neck 75 roll rouer pmging a mon of S&Jd@ e n e c k t o f o x = rings to metauic containers in the foregoing de;;cription, certain terms have been utiuzed for brevity, cleamess and understanding; bilt no tmnecessary Umitations are to be iinplied therefrom beyond the requirements 30 of the prior art; because such. words a-ile - utilized for descriptive purposes herein and not for the purpose of limitation, and are intended to@ be broadly construed Moreover, the ivention is nbt limited tO the@ 3. pr6duction of the ex@et structures shown hereof the openin.g May, be VaXied, in bmaun the size the length of the neck maY be varied, and the size and. shape of the@ flange. at the end @ of the axied, to proiide structural neck mav be v 40 embo&ments without departing from the scope of L the present method invention for manufactliring the vexious struetwes. The words "sheet metal" used herein and in t,he
