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Publication numberUS1379339 A
Publication typeGrant
Publication date24 May 1921
Filing date10 Oct 1917
Priority date10 Oct 1917
Publication numberUS 1379339 A, US 1379339A, US-A-1379339, US1379339 A, US1379339A
InventorsHaskell George D
Original AssigneeUs Machine Gun Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1379339 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



1,379,339, Patented May 24, 1921.

Invenov UNIT-sn STAT-es;

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'Patented May'za, 1921.

Apiuicatio filed October 1o, 1917. serial No. 195,812.

To LZZww/mz't may cof/www.' Y Y. i Be it known that IQGEORGE D. HAsKnnL, a citizen of the United Stated-and a 'resident of Concord, countylof Middlesex, and

`State of Massachusetts, .whose post-office address is 40 State street, Boston, Massa- J chusetts, have invented an Improvement in Machine-Guns, of which thek following description, in VAconnection with. the accompanying drawings, isa specication, like characterson-the drawings representing like `This invention relates to firearms and moreparticularlfyto machine guns and automaticguns, and has for its object more especially to provideimproved means for airi cooling Ythe same.

The objects land" aims Aofthe invention will be best understood from the :following description, taken in connection with the y.accompanying drawings,- of---Several 'embodi- :ments ofthe invention'shown' and described for illustrative purposes, Vit being .under- Stood that the inventionvin its 'true Scopefis definitely set forth by the claims.

In the drawings: j

kFgure l is Ya side elevation ofa rpart of 4a machine igunl embodyingl one illustrative .form of the 'present invention; v

` Fig. Q'iSalOngitudinal section of Fig. l, thebarrel and cooling sleeve surroundin same beingl shown ln'elevatlon;

Fig. 3` is `a longitudinal section, similar to 2, invention; y l n Fig. 14-is `a longitudinal section, similar tol F ig.` 2, vof a further 4embodiment of the invention;A 'Y

'of another embodiment of the Fig..j'5 is,V a cross 'Section5-online l5--15 of Fig. 1,'Ona somewhat ,enlarged scale,

-Fig.` 6 fis -adetailofoneillustrative means eningr thev sleeve surrounding the ,4 y

` -to that,T end IiS Anot Secured 'toSa-idnozzle 14 and member .4, butis'fmounted for ,swing-f i nl .the renewing Luegeiiptin, muy so much of the gunstructure will'bedescribed f Yas is necessary to an understanding fof the ,present inventions"- To the ybarrel 2.- there -is rigidly lsecured adjacent the rear' Vend thereof' andvinV any Y suitablejfmannen a sleevelike member 4 surrounding i'said barrel and-*providing an y,air space' around the latter; Said` member respectively, as

"41s. pr0videa wana port s, Saiaprtgin 55 l s VVVthey illustrative embodiments of the inven-j' tionl herein disclosed, lbeing provided at the under side of saidmember 4 and being-off* suiiicient Size'to'allow freeaccess Yofthe n outer air to .the interior of saidmemben 60 .It-,1s -to 'be understood, however, that said portcould be otherwiselocated in ysaid mem- ,ber orthatseveral vports could be provided; suitably placed with good results, but -,the

particular Aarrangement herein shown and described is of special utility.; c

Adjacent the m-uzzle of the barrel there Ais removably secured to the latter a spider@` l0, said spider.beinghereinshownas,se-

vcuredvto said muzzle by a clamping screw .or screws `12. Saidspideryl() has rigidly l, secured thereto Vby Vrivfetingor otherwise in any suitable'manner lanozzlev 14', surround-fv That Y part ofthe barrel 'between ,the ,noz-f jzleV 14 and` the xmember l4vis normallyA in- 80 Yclosed by a cylindricalbasing, said casing being ofv somewhat largerdiameter atvits endswhichv it over therear end of the noz-5 2 zle 14 and thev front end of the member 4,.

.clearlyv shown' in Figs. 2,13 85 and4f 'V- y n accordance with the `present invention, t this 'casing'l is fmade in two parts,fthe vlower;

part or lhalf lfbeing rigidly securedat l front a-nd rear .endsfbyrivetingor in `any other [suitable manner .to the rear end ofthe VVnozzle 14. and Lthe frontend of themember t 4, respectively Ywhile the. upper part. ore;

. half" l8gof' saidg-casing is intended 'tobef movable to exposerfthdbarrel. for a pur- 'n pose hereinafter more fullyffdescribed, 'and ingf-movement Aupon the Alower halfv 16; Herein the upper part1or.,-,sectionfl8 ofthe v10() casing is .hinged to the lower-fsectionl, as shown .ijnuFigs.` `l and 5, inthe-embodiment of .the invention shown Vin said.;

, three such hingesY-QObeing used` for thepur-" Y pose, butit will beapp'arent that anyother 105 means 'could Vbe uemployed @to permit `the v casing to be opened, without departing from vthe soopefof thev-lnvention, n L gi Any suitable means may be provided yin accordance with this Vinvention for securiingfthe upper section'18 ofthe casing 1n closed position, such as one or more swing bolts 22dpivoted to ears24 upon thevupper section and adapted to lcooperate Zinwell'y known vmanner with ears 28 upon'fthe lower [section 16, said swing bolts being provided"v ywith wing nuts 26. Thetwov sections landy f 18 being closed andv said wing nuts being loosened,-the bolts 22 canl be swung inwardly to'engage between ears 28, whereupon-by tightening vsaid Vwing nuts the secy llliclampedtogether. f The ears28 will preff tions 16vfand'1-8 rof the ca'singfwill besecurely erably beV provided ywith afdownwardly prol vrjecting lip 30vr at their outer edges, behind which i' the vwing nut becomes seated f when' tightened, thus 'adding'to the security of the fastening. `Only one of V`said VVVfastening means isiherein shown in Figs. 5 and 6, but preferably'onewill lbe provided `opposite each of the hinges. f v f In theembodiments of the invention herein shown, the barrel 2 is provided withj a fsleeve 32 that is lo'ngitudinallyvr iuted vr*or groovedfor provided with longitudinal ribs,

as shown at 34, upon lits outer surface, said `grooves',flutings or ribs, preferably extendving spirally about said sleeve,l

The sleeve 32 wi h `'ts' ribsor iutings l Vis Vintended to promote the dissipationlof ISIS- heat and thus' assist in cooling the'barrel, and. f i that"J this may be accomplished. as.effectivelyvk Vas possible said sleeve and the'flutings or ribs thereon will preferably be made of some material possessing `a ,high coeiiicient :of thermal conductivity, such as aluminum. The casing may also be made Vof similar material to the same end. For thesamev purpose, the sleeve with its ribs and the 'casing will preferably be blackened.

In the embodimentsof the invention herein disclosed, the sleeve .32V is applied to aV portion of the barrel only, herein the reary portion, that is to say to'that portion which becomes the most heated'by'the ring of the gun, but it will be apparent that the sleeve 32 could be extended throughoutja greater length of the barrel or even throughout the whole length thereof if that should be lfound expedient or desirable.

With the twofsections 16 and 18of the casing Vsurrounding the barrel securely closed, Y M Qtheffiring of thelgun will at each'shot expel a portion ofthe'air from the nozzle 14 and V'thus cause a certain amountof the outer air to enter the vrear end ofsaid casing through the port 8, and in' continuous firing a substantially'constant or continuous flow of air will thus beproduced along and about the barreland sleeve 32 within said casing, lthe air entering at'the rear of said casing Vand pouring out through the nozzlel4, and

this continuous flow of fresh air Vover the y vIt is.v found ,in

provided with -ilutings vor ribs 34 will *carry off the 'heat radiated thereby,r thus cooling they .Sleeve f,

and barrel. f Y p i practical-henares that wherebursts of firing arelc'ontinuousl-y prolonged beyond agcertain point, say for example l1000 shots, the heatis generated or stored up within the casing morelrapidly y,

thanit cank lbe carried olf bythe; draft of air through the casing and a point will yinevitably be reached where the barrellbe-v comesL so heatedthat, in order to avoid intothe gun, the firing must be'sus-` pended'and the .gunallowedto cool before f rin'gy can be resumed.vv y It has been, found,y howevenithat owing'to'the'great amount ofA f heatV that has.` become stored up lwithin'y the casingthe gun cools very slowlygfor the fir# ing having ceased-there is no longeicreated' adraft Vthrough the casing andthe heat has such action, the'k lay or. of the. lgun i v'By theil'lustrative arrangement above "described permitting the vcasing 'to be opened,

means are provided whereby the gun -can'be quickly cooled whenever desired; yFurther- `100k more, this can be accomplished without changing the position of :the gun or V,dis-

turbingthe aimiit being only necessary to unfasten the swing'bolts 22 and throw back the upper section of the casing as' soon as Vthe fringrceases, thus alfording-free'egress' to the heat so that thefgu'n isquickly cooled to a point where `firing can be resumed.`

ln order to secure' a tightclo'sing of the casing and thus not-impair the draft there sok through during the firing of theI gun, the-A i upper section 18 -of the casing-willprefen ably be provided with a recess 36 along each edge, see Fig 5, into which fitsr a corresponding rib 38 Vprovided Valong the inner edges of the lower Vsection 16.

V*In Fig.3,the inner wall of the casing is annular projections "40 throughout a part. of its length,',thusbring-V ing/the circulating airint'o moreintimatev Contact with thesleeve 32 atfthosepoints.'

In :F 1g. 4, the casing is shown as lprovided Lwith raidally disposed ribs or fins 42 dis- -posed'longitudinally of itsinner wall and with further'radially4 disposed ribs or fins tor, or, if integral with thecasing, the cas- 44'jeritending longitudinally of its gouter fwall to assistrin thedispersion of the heat. These iins or ribs'42 and 44 may be' made of aluminum' or any Vother goodheat 'conducing itself may be made of that metal or material. i

In the embodiment of the invention shownV in Figs. 4 and 7, to form the upper and lower sections 18 and l16, the casing is divided through the two diametrically opposed horizontal ribs 42 and 44, and two divided portions of the rib 44 upon one side of 'said casing being hinged together at 46, as shown in Fig. 7, by three suitably'spaced hinges for example, and the two parts of the divided rib 44 upon the opposite side of the casing being detachably secured together by swing bolts 48 each pivoted in a slot l50 of the upper part of said rib and engaging a slot 52 provided in the lower part of said rib.

In this construction also, in order lto secure a tight closure of the casing, the upper parts of the divided ribs 44 are provided with longitudinally extending ribs 54 that engage corresponding longitudinally extending recesses 56 in the lower parts of said ribs.

It will thus be seen that there is herein described apparatus in which the several features of this invention are embodied, and which apparatus in its action attainsl the v various objects of the invention and'is well suited to meet the requirements of practical use.

As many chanes could be made in the construction described, and many apparently widely different embodiments of the invention couldV be constructed without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limited-sense.


1. A gun having in combination, a barrel, a casing surrounding the same and extended forwardly beyond the muzzle of the barrel, air ports entering said casing near its opposite end, whereby firing ofthe gun will cause a current of air to enter the casing at said port, flow'along the barrel to cool the same and escape at the outer end of the casing, said. casing having outwardly extended heat radiating ribs thereon, the casing'split longitudinally through'a plurality of Said ribs, and hinged to open along one of the rib ends, recesses in two of the split vportions of said ribs and beads on the opposite split portions of said ribs to enter the recesses whereby the casingymay be opened throughout its length to further admit air within the same. V

2. AV gun having in combination, a barrel, l

an aluminum casing surrounding the same and extended forwardly beyond the muzzle of the barrel, air ports entering said casing near its opposite end, whereby firing of the gun will cause a current'of air to enter-the casing at said port, flow along the barrel to about, and a fixed casing member 16 therefor, having a nozzle 14 extending beyondV the muzzle of the gun, said casing having the port 8 at its rear end, outwardly ex- 1 tended ribs 44 thereon7 the casing split-longitudinally through said-ribs and hinged.

thereat, to open along Y onerof said ribs'to admit air to the barrel throughout substantially the length thereof, twoA of said split v rib portions having recesses 56 in the faceof the same andthe corresponding splitv rib portions havingbeads 54 thereon to enter'v said recesses when the casing members are closed.

4.In a gun, the combination withitheV barrel 2, of the sleeve 4, having the port-8, spider 10 and nozzle 14, the casing comprising the closed section'l16 and hinged section 18, swing bolts 22 on the section 18 adapted to coperate with the ears 28 on the section 16; andthe sleeve 32 on the barrel 2.'

In testimony whereof, I have signed my.

name to this specification.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2775052 *21 Nov 195225 Dec 1956Dietsch Francis WBipod and face shield for a rifle
US2952934 *14 Feb 195720 Sep 1960Lazare YovanovitchFirearm with rearward swinging breech block
US3090150 *13 Jun 196021 May 1963Fairchild Engine & AirplaneHand guard construction
US3118243 *17 May 196121 Jan 1964 Rifled barrel for firearms
US4638713 *25 Nov 198527 Jan 1987Vickers Public Limited CompanyThermal sleeve for gun barrels
US6945154 *15 Jan 200420 Sep 2005Luth Randy EFinned carbine handguard assembly
US7963203 *15 Sep 201021 Jun 2011Davies Robert BRifle
US9658010 *13 Oct 201523 May 2017Paul OglesbyHeat shielding and thermal venting system
US20090133308 *27 Nov 200728 May 2009Sako OyDevice, method and arrangement to warm or cool a firearm
U.S. Classification89/14.1
International ClassificationF41A13/12, F41A13/00
Cooperative ClassificationF41A13/12
European ClassificationF41A13/12