US1990189A - Dome cover for tank cars - Google Patents

Description

Feb. 5, 1935. e. w. KING I DOME COVER FOR TANK CARS Filed NOV. 2'7, 1931 Patented Feb. 5, 1935 w p 1,990,189 'poMi; oovEle FORITANK'CARS -George King, Coffeyville, Kans., assignor of v two-twelfths to Lee '1; Englund, two-twelfths to John-,E..=Mahan, both of Coffeyville, Kan s.,

"and, sieyen twelfthsf to' Roy T. Osborn, New

Y rkY,

1 Application November 27 1931, Serial No. 577,488 Qlairns. (o1.z 2o z4) My invention relates to dome covers fortank cars and is primarily concerned with providing a cover that may be readily interchanged with present types of threaded dome'icovers without requiring any modifications of existing strucf" tures. I,

One object of my invention to devise a dome characteristics sufiiciently adequate to meet the requirements of a casing head gasoline tank car dome cover.

A further objectis to provide a dome cover' which permits the utilization ofthe-fpresentdome ring and which enablesthe'cover proper to be secured in positionby attachment" other than screw threads, sdthat the cover will-provideaf moreeffective seal agai ns t vapor pressure.

character indicated which is held in position by a series of swingably mounted'bolts' which are permanently attached to-a collar fixed to the dome of the tank car, the position of the bolts when the cover is in securing position being such that, when the bolts are being loosened to per mit removal of the cover, a sufiicient retaining engagement of the bolts with th'e'cover is main i H V I U showing the same in relation to a portion-of a tamed-while the cover'is capacitatedfor a slight movement away fronr the valve seat to relieve any excessive pressure within the tank car.

A large number of the tank cars now in operation are provided with the old screw type of dome cover which, through continued use, becomes so battered and worn as to be very objectionable, particularly where the car is being employed for the transportation of volatile, inflammable vapors and liquids. The screw type of dome cover is intended to form a sealing engagement with the dome ring through the medium of a lead packing ring, but this ring, over a period of time, becomes dented and will not satisfactorily operate as a sealing element. The latter condition obtains particularly when the car is being coupled in train, causing, a spraying of the contents outwardly on the surface of the car between the cover and dome ring; The threads on these types of covers also become worn with the result that the cover elventually reaches a condition of the so-called drop lid, necessitating an actual prying of the cover out of the ring by a bar or other suitable tool. The latter action obviously is very detrimental to the soft lead sealing ring. The screw cover, moreover, frequently exhibits a tendency to stick and in the A further object is to "provide a cover of the effort tolloosen the cover, it is very often cracked and'there, is always the dangenofbreating a spark during such removal with obvious results, 7

where the car is loaded with inflammablematerial.

The present invention is intended to over-- come the foregoing objections through providing a dome cover which may be readily mounted on those cars whichare now provided with the screw type of cover. The nature of the proposed arrangementQi's'such that the degree of sealing engagement obtainable, if the other parts of the V car. are'in a proper condition, will satisfactorily meet the requirements established bythe American Railway Association for Class IV tank cars.

The new cover possesses inherent features in that, during the process of removing the cover, any excessive pressure obtaining within the tank carwill be relieved prior to a complete removal of'the cover; r.

These and further objects of my invention will f be set forth in the following specification, reff- I claims.

tank car dome.

Fig. 2 is a section" along. the line =2 2 in Fig. 1, I

2, looking in the direction of the arrows, and

showingthe manner of hingedly connecting the cover to the accompanying structure.

Referring to Fig. 2, the numeral 10 designates a'portion of a tank car dome which is provided with the usual dome ring 11 that is internally threaded as at 12. A collar 13 which is exteriorly threaded adjacent its lower end is screwed into the ring 11 and the opposite end of said collar is provided with a beveled valve seat 14. Intermediate its ends, the collar 13 is provided with an annular, exteriorly positioned flangev 15, between which and the ring 11 is interposed a sealing ring 16, thus providing a vapor-tight joint in the indicated location when the collar 13 isin position.

Above the flange 15, the collar 13 is provided Wit h '3, plurality of lugs 1''! which are preferably arranged in spaced pairs around the periphery of this collar. Bridged between each pair of said lugs is a pin 18 upon which is pivotally mounted the apertured end of an eye-bolt 19.

'erence being had to the accompanying drawing, and the novelfmeans by which said objects are eifectuated will be definitely pointed out in the' 25, I

Accordingly, these eye-bolts are permanently and that during this relief, the cover 21 will still be swingably mounted on the collar 13. The threadadequately, held against any sudden movement ed stem of each eye-bolt 19 is intended to pass outwardlyby the bolts 19. The improved cover between a pair of lugs 20 which are provided on may be readily substituted for existing threaded 5 a dome cover 21, it being understood that there covers without requiring any changes in the pre- 5 are as many pairs of 1ugs20 as there are eye-* maining portionoif'the dome structure. v bolts 19. The ,undersi deof theicover zizisfurther While. I'have shown one set of elements'iand provided with a preferably circular shou1der--22" combinations thereof for 'efl'ectuating my imhaving a curved cross-section which is intended proved dome cover, it will be understood that the 10 to cooperate with the valve seat 14. When the--- same is intended for illustration only and in no 10 cover is in the sealing position shownrin Figtz, wise-t0,-restrietA;he device to the exact forms and the bolts 19 are swung upwardly to pass between structures shown, for many changes may be made the indicated pairs of lugs 20; whereupon-the-nuts therein without departing from the spirit of my 23 on said bolts may be tightened to'securelyjh'ol'd' invention psuchasMthe adaptation of the dome said cover in sealing position: 'l a 'cove'i imtanksingenerm; The application of the 15 As an improvement on the present method of' improved domecoverto tank cars has been adoptholcling a screw type of dome cover with a chain, ed for purpose of'desc'ription only and is not to it is contemplated that theido xne "cover-1:213 wi-lIri bmconsidereduaatre'strictive in nature, although be hingedly connected to the collar 13. To this ,the'domewover does have specific advant e 7 end, a hinge part 24 is provided on said collar and in respect ora, tank car. 7 20 is .eshaped itoaextendeupwardlyiiand outwardlyt- I claim; 1 v a a t I Y therefrom. Ar quadrant shaped. slot l25tis formed; 1. I ln attank Lear theicombination-of -.amEinter-FM in the hinge-24pm receive ,a hinge in za that. ism u x dome iring jntefided-ito,.n01m3,1ly mountedimthecoverm, lttzwillibevobseryed that -receive-a.threaded dometcover a collar threaded 251., the shape ofthe slot 25 is such that the cover-.21.:insaidhring andxhaving atvalyetseat i u is moi Z znwfl d yt d.=t en -Outwardly aw y having sealing contact with said ring,vbolt meansfrom athaentrance toctheu dome-110, while. stillsmountedt omsaid-gcollar a ncov'en. lhavingz -a parts maintainingt-anwadequateTandfixedl connection l for sealablyr coopemtingrzwith saidlseat m pse tothe collar:;13'.,-i a t "on saidr cover.icooperatingt with,saidbolt' means:

1, Ina-applying theadome ecoyer above described forholdingtheicovermtpositionm. I i t toa :tankecaniwhichihasrtheretoforeabeenwpro 1 In,,a tank .caxwthencombination vof -an-inteize vided withthe ordinary screwtype of. cover, itis: nally thrMaded. dome. .ring.,intended rto normally yi-QEGQSSM?! toe emo-vlfi ihe latter -and-mo re?receive a threaded dome cover, a collarc threaded I place, where; necessarygsa meWLJseaIing-JingJ for- -intsaidt ringand haying; at yalveiseat, said; collar theyring denoted-,by;the,numeral .16 Thereafter, having sealing contactt withvsaid rina a plurality; 35

the collars-1111 isthreaded in= h =domeering lyandw of ,securina-bqltsswin abln mountedionsaid ..co1.-:; theccoverz 21 may -imDQ F L. vfl fi lary a eovenhavinaa pant fortsealablmcooperatingt,1 described-:1 I withgsaidseat -anmspacedzelugsbn-trsaidccover The.maturesofa-th n e fieieting val e .-parts-. ,-of.-.. operatinalnbemunction-iwithsaidboltsrand nutsi 40 ,the cover and collar is such that a veryr efiec-tivemr iq b it f holdmg the; cpye tjn position.

EM mnvided: against Waller pre sure, w hrth 3.11m t=atank cararthefmombination of annin-F, further advantage that zsuchtvalve parts are :not:.-ternal1y threadedigemeging,intendedto nOrmally easily: -,damaged ,in -.usem 'l'he: collar ?13, ;Wi h ritS---reeeiye.- .a threaded r domepcover ia pollarrhavingm; associatedh eyeebolts,;-.remains;lpermanentlm in a valve seat thneadeddnesaidringgand beinefi {11 511510112ontthea erl avinerpnlmthead ecev vided-rvithtamamiulaaflange overlyinsnsaid rins; 21 to be loosened and swung outwardly on itsn fonsealjnggontact ithelFeWith;-;&-;BOYB1 haying ac" h n 24. Du n su h l s ine lnevement it part;for :sealablyfimflpeaating witksaidrseatpears will be obviousvthat the initial unscrewing move extendingqoutwardly; from said collaeabove saidt mentof thetnuts 23 willapermit ai-sufiieientraxi wagflangegandfbolt.means-mountedmnsaidears and. movem nt of the v r to r li ve a y-exces ;v pors-enga ing saidicoveetwhem thesamevin position.,- 50 pressure. thatmmayiiobtaipnwithinmthe tank and GEQRGE-,-W-.-'KING.-

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