专利US8443730B2.docx

专利US8443730B2.docx

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专利US8443730B2

[公开号]:

US8443730B2

[专利名称]：

HIGHSTRENGTHPOLYMER-BASEDCARTRIDGECASINGANDMANUFACTURINGMETHOD

[公开日]:

May21,2013

[国际分类]:

F42B5/SO（2006.01）

[申请号]:

13/350,607

[申请日]:

Jan.13,2012

[发明人]：

CharlesPadgett,Orlando,FL（US）

[申请人]：

PCPTactical,LLC,VeroBeach,FL（US）

[优先权号]：

US2012/0180688A1Jul.19,2012

[同族专利]：

[发明摘要]：

Ahighstrengthpolymer-basedcartridgecasingcanincludeafirstendhavingamouthandaneckextendingawayfromthemouth.Next,ashoulderextendsbelowtheneckandawayfromthefirstend.Thecartridgecanbehaveafrangibleportioncapableofbeingsplitupondischargeofaprojectile.Theshouldercanhaveunequaloutsideandinsideshoulderangles.Thecasingcanalsoincludeaninserthavingarimatoneendorapluralityofribsextendinglongitudinallyalongawallbetweentheshoulderandthebottomofthecartridgeandspacedradiallyfromeachotheraroundacircumferenceofthewall.Aprojectilecanbedisposedinthemouthandareliefcanbedisposedonthenecknearthemouthandprojectile.Thereliefcanformagapbetweentheneckandtheprojectiletoreceiveanadhesive.

[发明领域（关键词）]:

Thepresentsubjectmatterrelatestoammunitionarticleswithplasticcomponentssuchascartridgecasingbodies,and,moreparticularly,tomakingammunitionarticleswithribs,avariablewidthshoulder,aninsert,andfrangibleneck.

[发明背景]：

Itiswellknownintheindustrytomanufacturecartridgecasesfromeitherbrassorsteel.Typically,industrydesigncallsformaterialsthatarestrongenoughtowithstandextremeoperatingpressuresandwhichcanbeformedintoacartridgecasetoholdthebullet,whilesimultaneouslyresistrupturingduringthefiringprocess.

Conventionalammunitiontypicallyincludesfourbasiccomponents,thatis,thebullet,thecartridgecaseholdingthebullettherein,apropellantusedtopushthebulletdownthebarrelatpredeterminedvelocities,andaprimer,whichprovidesthesparkneededtoignitethepowderwhichsetsthebulletinmotiondownthebarrel.

Thecartridgecaseistypicallyformedfrombrassandisconfiguredtoholdthebulletthereintocreateapredeterminedresistance,whichisknownintheindustryasbulletpull.Thecartridgecaseisalsodesignedtocontainthepropellantmediaaswellastheprimer.

However,brassisheavy,expensive,andpotentiallyhazardous.Forexample,theweightof.50caliberammunitionisabout60poundsperbox（200cartridgespluslinks）.

Thebulletisconfiguredtofitwithinanopenendormouthofthecartridgecase.Certainbullets,mainlyfornon-militaryuses,canincludeagroove（hereinafterreferredtoasacannelure）formedinthemidsectionofthebullettoacceptacrimpingactionimpartedtothemetalliccartridgecasetherein.Whenthecrimpedportionofthecartridgecaseholdsthebulletbylockingintothecannelureorontothediameter,abulletpullvalueisprovidedrepresentingapredeterminedtensionatwhichthecartridgecaseholdsthebullet.Thebulletpullvalue,ineffect,assistsimpartingaregulatedpressureandvelocitytothebulletwhenthebulletleavesthecartridgecaseandtravelsdownthebarrelofagun.

Furthermore,thebulletistypicallymanufacturedfromasoftmaterial,suchas,forexampleonly,lead.Thebulletisacceptedintothemouthofthecartridge,andthenthecartridgealoneiscrimpedtoanyportionofthebullettoholdthebulletinplaceinthecartridgecase.Though,typically,thecartridgecaseiscrimpedtothecannelureofthebullet.

However,onedrawbackofthisdesignisthatthecrimpedneckdoesnotreleasefromaroundthebulletevenlywhenfired.Thisispartlyduetothefactthatthebrasscasingisnotmanufacturedperfectly.Thematerialthicknessaroundtheneckisslightlydifferentcausingthecasetodeformatslightlydifferentratesthusallowingthebullettobepushedslightlyoffcenterwhencomingout.Thisleadstouncertainperformancefromroundtoround.Pressurescanbuildupunevenlyandaltertheaccuracyofthebullet.

Thepropellantistypicallyasolidchemicalcompoundinpowderformcommonlyreferredtoassmokelesspowder.Propellantsareselectedsuchthatwhenconfinedwithinthecartridgecase,thepropellantbumsataknownandpredictablyrapidratetoproducethedesiredexpandinggases.Asdiscussedabove,theexpandinggasesofthepropellantprovidetheenergyforcethatlaunchesthebulletfromthegraspofthecartridgecaseandpropelsthebulletdownthebarrelofthegunataknownandrelativelyhighvelocity.

Theprimeristhesmallestofthefourbasiccomponentsusedtoformconventionalammunition.Asdiscussedabove,primersprovidethesparkneededtoignitethepowderthatsetsthebulletinmotiondownthebarrel.Theprimerincludesarelativelysmallmetalcupcontainingaprimingmixture,foilpaper,andrelativelysmallmetalpos