专利US8443730B2文档格式.docx
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[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