LIMITED DEFORMATION CONTACT ELEMENT FOR AN ELECTRICAL SOCKET

Abstract

Contact element for an electrical socket to receive a plug contact pin, comprising a connection base for connecting a conductor, and two spring-loaded contact arms forming an entry opening configured to receive the contact pin such that the two spring-loaded socket arms are deflected outwards under spring load upon insertion, where the connection base comprises an arrangement of projections configured to work in conjunction with an external wire connection element such that connection points are kept aligned when the contact pin is inserted into the entry opening.

Description

BE2025 / 5016 2 compromisingfunctionalityorsafety.Miniaturizationalsoallowsfortheintegrationof additionalfeatures,suchassurgeprotectionorsmartconnectivity,withinthesame compactformfactor.However,whilereducingthesizeoftheseelements,careful considerationmustbegiventomaintainingtheirelectricalperformance,heatdissipation, andmechanicalintegrity.Thisensuresthatevenasthecomponentsshrink,theycanstill5 handletherequiredelectricalloadsandprovidereliableandsafeconnectionsover extendedperiodsofuse. Further,thecontactforceofacontactpininaplug-and-socketassembly playsacriticalroleinensuringreliableelectricalconnections.Theforceexertedbythe10 contactpinagainstthesocket’sconductiveelementsmustbesufficienttomaintainstable electricalcontinuitywhileavoidingexcessivewearordeformationofeitherthepinorsocket. Typically,thedesignofthecontactpinandthesocket'sreceptaclemustaccountforfactors suchasmaterialproperties,surfacetreatments,andthemechanicaltolerancesthataffect thefrictionandpressureatthepointofcontact.Optimizingthiscontactforceisessentialfor15 reducingcontactresistance,preventingoverheating,andensuringthedurabilityand performanceoftheplug-and-socketsystem. DocumentEP2223391B1disclosesadesignaimedatimprovingconnectivity andreliabilityinvariousapplications.However,whilethedesignseekstoaddressthe20 challengesofmaintainingstableelectricalconnectionsunderconditionslikevibrationand thermalexpansion,itreliesonstressabsorptionthroughthebendingofthecontactmaterial. Thisapproach,whileeffectiveintheory,mayintroducepotentialdrawbacks,suchas materialfatigueovertimeorlimitationsindurabilityunderextrememechanicalstresses. Furthermore,thisapproachresultsinadesignthatcanbecomedisproportionatelylarge,25 potentiallylimitingitssuitabilityforcompactapplicationswherespaceisacriticalfactor. DocumentFR3002088A1describesanelectricalcontactforpowersockets composedofmultiplepieces,whichincreasesmanufacturingcomplexityandcost.Whileit aimstoimproveelectricalconnectivityandsafety,themulti-piecedesignintroduces30 potentialdisadvantages,suchashighersusceptibilitytomechanicalwearandassembly challenges.Thesefactorsmayaffecttheoverallreliabilityanddurabilityoftheconnection, particularlyindemandingorhigh-useenvironments.Additionally,thecomplexityofthe designmakesitlesscompetitivecomparedtosimpler,morerobustalternativesalready available.35 2025 / 5016 BE2025 / 5016 3 DocumentEP0908966A1disclosesacontactblockforelectricalsocketbases. Whilethecontactblockaimstoenhancesafetyandreliability,thediscloseddesignallows thebasetoextendwhenwiresareinserted,potentiallyformingariskofmisalignmentor instabilityintheelectricalconnection.Thiscouldcompromisethedurabilityandsafetyof thesocketinpracticalapplications.5 GermanutilitymodelDE8235048U1describesadeviceforconnectingtwo conductorswithoutscrews.However,duetotheopenbottominthebase,additional componentsarerequiredtoproperlysecureandconnectthewires,whichcomplicates installationandincreasematerialcostscomparedtodesignswithanenclosedbase.10 Thosedevicespresentdifferentdrawbacks.Firstly,whencomponentsare miniaturized,somerelyonexternalelements,suchasthehousing,togeneratethenecessary contactforce.Thisreliancepresentsadisadvantage,asdamagetoeitherthecomponent orthehousingcanrendertheentiresysteminoperative.15 Anotherdisadvantageidentifiedbytheinventoristheoccurrenceof increasedmechanicalstressduetotherequirementforahighcontactforce.Thiselevated stresscanleadtoacceleratedwearanddegradationofthecomponents,reducingthe overalldurabilityandoperationallifespanofthedevice.Additionally,thehigher20 mechanicalforcesinvolvedmaynecessitatetheuseofmorerobustmaterials,whichcan increasemanufacturingcomplexityandcosts.Thesechallengesareparticularly pronouncedinapplicationswherecompactdesignsandlong-termreliabilityarecritical.Thirdly,aspreviouslynoted,thedesignmuststrikeabalancebetweenuser25 comfortandfunctionalrequirements.Specifically,theforcerequiredtoremovetheplug mustnotbeexcessivelyhightoensureeaseofuse,whilesimultaneouslymaintaininga sufficientcontactforcetoensurereliableelectricalconnections.However,theinventorhas observedthatachievingthisbalanceisparticularlychallenging.Inmanyinstances,existing designsfailtoadequatelyreconciletheseopposingrequirements,resultingeitherin30 excessiveforcerequiredforplugremoval,whichcanbecumbersomefortheuser,orin insufficientcontactforce,whichcompromisesthereliabilityandsafetyoftheconnection. Thislackofanoptimalbalancehighlightsasignificantdesignlimitationinthecurrentstate oftheart. 35 2025 / 5016 BE2025 / 5016 4 Briefsummaryoftheinvention Theobjectiveofthepresentinventionistoprovideanelectricalsocketthat ensuresreliability,safety,andoptimalfunctionalperformance,addressingtheneedsof modernelectricalsystems.Specifically,theinventionaimstodeliverarobustanddurable5 solutioncapableofwithstandinglong-termusewhilemaintainingasecureandconsistent electricalconnection.Furthermore,theinventionaimstoaccomplishthesegoalsinadesign wherethecomponentsareminiaturized,allowingforcompactandspace-efficient applicationswithoutsacrificingthemechanicalrobustnessorelectricalreliabilityofthe system.Byaddressingthechallengesofminiaturization,theinventionovercomesthe10 limitationsofexistingdevicesandoffersasolutionthatmeetsfunctionaldemands.Accordingtotheinvention,thisobjectiveissolvedbythepoleterminal accordingtothefirstclaimmanufacturablefromaflatsheetthroughafoldingprocessand configuredforanelectricalsocketforreceivingacontactpinofaplug,thepoleterminal15 comprising: -aterminalbaseforconnectingaconductor; -tworesilientcontactingarmsextendingfromtheterminalbasefromtwo correspondingconnectionjoints,eachcomprisinganouterlegandaninnerlegwith abentendpositionedbetweenthem,theinnerlegsbenttowardseachother20 therebyforminganinsertionopeningpositionedbetweentheouterlegsconfigured toreceivethecontactpinsuchthatthetworesilientsocketarmsaredeflected outwardinaspring-loadedmanneruponinsertionofthecontactpinintothe insertionopening; CHARACTERIZEDINTHAT25 theterminalbasecomprisesanarrangementofprotrusionsconfiguredtointerfacewithan externalwireterminalelementsuchthattheconnectionjointsarekeptalignedwhenthe contactpinisinsertedintotheinsertionopening.Firstly,beforediscussingthedetailsofthetechnicalfeaturesofthepole30 terminalandtheadvantagesthereof,itisnotethatthepoleterminalismanufacturable fromaflatsheetthroughafoldingprocess.Thismeansthataflatsheetistransformedintoa three-dimensionalstructure.Theflatsheetmaterialisfirstcuttosizeandcleanedtoensure optimalfoldingconditions.Next,foldinglinesontheflatsheetaredefinedthroughscoring, perforating,and / ormarkingdefinedbythegeometryofthecapandmoulddie.Thisensures35 thefoldsoccursatpreciselocationsandreducesstressonthematerialduringbending. 2025 / 5016 BE2025 / 5016 5 Further,theflatsheetissecuredin,forexample,afoldingjig,clamp,ormachinetomaintain stabilityduringthefoldingprocess.Subsequently,acontrolledforceisappliedalongthe scoredormarkedlinesusingtoolssuchaspressbrakes,rollers,ormanualtechniques.After folding,thestructureforalignment,angles,andoverallintegrityisinspectedtoensurethe foldedpoleterminalmeetsthedesignspecifications.5 Thisapproachsignificantlyreducesmaterialwastecomparedtotraditional manufacturingmethodsthatinvolvecuttingandmachining.Additionally,flatsheet materialsareoftenreadilyavailableandcost-effective,simplifyingsupplychainlogistics. Thefoldingprocessalsominimizestheneedforcomplextooling,reducingproductioncosts10 andleadtimes.Furthermore,theflatsheetdesignallowsforcompactstorageand transportationpriortoassembly,makingithighlyefficientforlarge-scalemanufacturingand distribution. Itshouldbefurtherunderstoodthattheflatsheetmaterialiscomposedofan15 electricallyconductivematerial,suchascopper,aluminium,brass,oranyothersuitable conductivematerial. Thepoleterminalcomprisesaterminalbaseandtworesilientcontacting arms.Theterminalbaseisconfiguredforconnectingandsecuringaconductor.This20 conductormaytaketheformofawire,contact,connector,oranyothersuitabletype. Moreover,theterminalbasemaybeconfiguredtoconnectmultipleconductors.Itshould benotedthattheconductoritselfisnotanintegralpartoftheterminalbase.The conductor'sfunctionistodeliverelectricalvoltagefromanelectricalsourcetotheterminal base,andfurthertothetworesilientcontactingarmssuchthatwhenaplugisinserted,a25 voltagedifferenceisestablishedallowingcurrenttoflow. Thepoleterminalfurthercomprisestworesilientcontactingarmsextending fromtheterminalbasefromtworespectivecorrespondingconnectionjoints.Inthecontext ofthepresentinvention,thetworesilientsocketarmsdefineaninsertionopeningfor30 receivingaplug'scontactpin.Thesesocketarmsareconfiguredtoflexoutwardlywhenthe pinisinserted,allowingafirmandreliableconnection.Eacharmincludesanouterlegand aninnerleg,withtheinnerlegsbenttowardseachothertoformaninsertionopening betweentheouterlegs.Abentendispositionedbetweentheouterandinnerlegsand formstheconnectionpointsbetweenthem.Thestructureisspecificallydesignedsothat35 whenacontactpinisinsertedintotheinsertionopening,thetworesilientarmsaredeflected 2025 / 5016 BE2025 / 5016 6 outwardinaspring-loadedmanner.Thespring-loadeddeflectionensuresasecureand reliableelectricalconnectionbymaintainingcontactpressureontheinsertedpin,thus improvingconductivityandreducingthelikelihoodofconnectionfailureduetoloosening orexternalvibrations.Thedesignensuresthattheinsertionprocessissmoothwhileallowing forrepeatedconnectionsanddisconnectionswithoutdegradingtheintegrityofthe5 connection.Thisconfigurationprovidesrobustmechanicalandelectricalcoupling,whichis crucialforconsistentandreliableoperationinelectricalsystems. Theinsertionopeningisfurtherknownasabuttjoint,abuttingjoint,end-to- endjoint,flushjoint,buttconnection,straightjoint,orface-to-facejoint.Asisknowninthe10 priorart,aninsertionopeningmayfurthercompriseanalveole.Itreferstosmall,recessed compartmentsorcavitiesdesignedtoreceivetheprongsorpinsofaplug.Thesecavities guidetheinsertionoftheplugintothesocket,ensuringproperalignmentandconnection betweentheconductiveparts.Thealveolehelpsprovideasecurefitfortheplug.Hence, althoughitisnotanessentialelementofthedisclosedinvention,thepoleterminalpreferably15 comprisessuchanalveole.TheshapethereofcomprisesaV-shapeform,aroundshape form,oranotherformsuitableforreceivingaplug. Accordingtoanewandinnovativeaspectoftheinvention,thepoleterminal, andmoreinparticulartheterminalbasefurthercomprisesanarrangementofprotrusions20 configuredtointerfacewithanexternalwireterminalelementsuchthattheconnection jointsarekeptalignedwhenthecontactpinisinsertedintotheinsertionopening. Theexternalwireterminalelement,aswillbefurtherexplained,servesadual purpose.Firstly,itensuresthatasecureandreliableconnectionwhenanexternalwireis25 insertedintotheterminalbase.Secondly,inconjunctionwiththearrangementof protrusions,theterminalactsasaholderfortheconnectionjoints,keepingthemaligned. Maintainingthealignmentoftheconnectionjointsensuresaproperfunctionalityofthepole terminalandenhancesitsoverallperformance.Thisisbecauseitincreasesthecontactforce therebyensuringimprovedelectricalconductivityandenhancedreliabilityofconnections.30 Uponinsertionofthepinintotheinsertionopening,theinnerlegsoftheresilient contactarmsextend.Thisoccursbecausethediameteroftheinsertionopening,defined bytheseinnerlegs,issmallerthanthatofthepin,causingtheinnersurfacesofthelegsto bendaroundthepin.Additionally,thepinofaplugtypicallyhasaroundedshapeatitstip,35 whichfacilitatesagradualextensionoftheinnerlegs—particularlywhenthepoleterminal 2025 / 5016 BE2025 / 5016 7 comprisesanalveole,aspreviouslydescribed.Moreover,astheinnerlegsextend,theouter legsalsoextendduetotheirmechanicalcouplingthroughthebentends. Withoutthepresenceofthearrangementofprotrusionscombinedwiththe externalwireterminalelementinsertedintotheterminalbase,theextensionoftheouterlegs5 causesadeformationoftheterminalbase.Thisdeformationoccursattheconnectionjoints becauseofthemechanicalforcetransmissionwhenthepinisinserted.Thisdeformationis determinedbythedifferenceindiameterbetweenthepinandtheinsertionopening, namelyagreaterdiameterdifferenceresultsinabiggerdeformation. 10 Thedeformationresultsinthetwoconnectionjointsshiftingfurtherapart, whichleadstoalessreliableconnection.Thisdisplacementincreasesthespacingbetween thejoints,consequentlycausingboththeouterandinnerlegstomoveapart.Astheinner legsformtheinsertionpoint,thisseparationleadstoanenlargementoftheinsertion opening.Suchanenlargementposesasafetyconcern,asitmaycompromisetheintegrity15 oftheelectricalconnectionbetweenthepoleterminalandthepinofaplug,potentially resultinginalooseorunreliableconnection. Thepresenceofthearrangementofprotrusions,wheninterfacedwiththe externalwireterminalelement,playsacrucialroleinmaintainingthealignmentofthe20 connectionjoints.Theprotrusionsactasstabilizingfeatures,ensuringthattheconnection jointsareheldsecurelyinplace.Bypreventingsuchunintendedmovementordisplacement ofthejoints,asinthepriorart,thedesigneffectivelyeliminatestheriskoftheinsertionpoint enlarging.Thisstabilizationisparticularlybeneficialasitensurestheinsertionpointretainsits originaldimensions,therebymaintainingasecureandreliableconnectionwithapinofa25 plug.Thealignmentprovidedbytheprotrusionsnotonlyenhancesthemechanicalstability ofthepoleterminalbutalsopreventspotentialsafetyissues,suchaspoorelectricalcontact, whichcouldarisefromanenlargedinsertionpoint. Accordingtoanembodiment,theterminalbaseencompassesabar-shaped30 spaceconfiguredforreceivingtheexternalwireterminalelement,andwherebythe arrangementofprotrusionsisorientedwithinthespace.Thisbarshapedspacehasan openingwhereintheexternalwireterminalelementcanbeinsertedtohouseit. Furthermore,accordingtoanembodiment,theterminalbasecomprisesanelongated openingalongitslongitudinaldirection.Thiselongatedopeningderivesfromthefolding35 process.Thebar-shapedspaceiscreatedthroughaseriesoffolds,withtheopening 2025 / 5016 BE2025 / 5016 8 resultingfromthefoldthatcompletesthebarstructure.Furthermore,accordingtothis embodiment,thearrangementofprotrusionsislocatedatthesideofthiselongated opening,wherebytheareformedbyfoldingtheprotrusionsintotheencompassedspace. Thisisadvantageousbecauseitallowstheprotrusiontobeformedefficientlyandwith minimalcomplexity.5 Accordingtoapreferredembodiment,thearrangementofprotrusionsis locatedonthesideneartheinsertionopening.Thiswaytheyarepositionednearthe connectionjoints,ensuringefficientmechanicalalignmentwheninterfacingwiththe externalwireterminalelement.10 Accordingtoanembodimenttheterminalbasefurthercomprisesclamping meansconfiguredforclampingtheexternalwireterminalelementwheninserted. Theterminalbasemayfurtherbeequippedwithclampingmeansspecifically15 designedtosecurelygriptheexternalwireterminalelementuponinsertion.Theseclamping meansensureareliableandstablehousingoftheexternalwireterminalelement,thereby preventingunintentionaldisconnectionormovementoftheexternalwireterminalelement. Thisdesignfeaturesimplifiesassemblywhilemaintainingarobustinterfacebetweenthe terminalbaseandtheexternalwireterminalelement.20 Preferably,thepoleterminalispositionedinareflectionalsymmetrical manner.Thissymmetricalarrangementensuresoptimalmechanicalbalance,which enhancesthestructuralstabilityandreducesthelikelihoodofunevenstressdistribution.This configurationenhancestheuniformityofcontactpressureacrosstheelectricalconnection,25 ensuringimprovedelectricalconductivityandstability.Furthermore,thedesignsimplifiesthe assemblythroughthefoldingprocess.Fromamanufacturingperspective,thissymmetry allowsforuniformityinproduction,reducingcomplexityandcost.Additionally,the reflectionalsymmetryfacilitateseasierintegrationwithcorrespondingcomponents,suchas anelectricalsocket.30 Accordingtoasecondaspectoftheinventionanexternalwireterminal elementisdisclosedconfiguredtobeinsertedintothepoleterminalaccordingtothefirst aspectoftheinvention.Tothisend,theexternalwireterminalelementcomprisesan arrangementofprotrudingarmsconfiguredtointerfacewiththearrangementofprotrusions35 oftheterminalbase. 2025 / 5016 BE2025 / 5016 9 Thearrangementofprotrudingarmsisshapedtocorrespondwiththe arrangementofprotrusionsoftheterminalbase,allowingthemtohooksecurelyontoeach other.Toensurethealignmentoftheconnectionjoints,thearmsapplyinwardpressureon theprotrusions,creatingastableandreliableconnection.Thisdesignprovidesmechanical stability.Theinwardforceexertedbythearmsensuresthattheconnectionjointsaresecurely5 heldtogether,evenunderconditionsofmechanicalstressorvibration. Accordingtoanembodiment,theexternalwireterminalelementfurther comprisesaresilientbodyconfiguredtofacilitateaconnectionwithaconductor.10 Theexternalwireterminalelementisdesignedwitharesilientbody, specificallyconfiguredtofacilitateanefficientandsecureconnectionwithaconductor, alternativelytwoconductors.Thisresilienceallowstheterminaltoadapttoslightvariations insizeorshapeoftheconductor,ensuringasnugandreliablefit.Theflexiblenatureofthe resilientbodyminimizestheriskofdamagetotheconductorduringinserting,while15 maintainingconsistentcontactpressuretoenhanceelectricalconductivity.Additionally, theelasticityofthematerialhelpsabsorbmechanicalstresses,suchasvibrationsorthermal expansion,preventinglooseningordegradationoftheconnectionovertime.Preferably, theresilientbodyispositionedawayfromthearrangementofprotrudingarms. 20 Accordingtoanembodiment,theexternalwireterminalelementfurther comprisesasetofrecessesconfiguredtointerfacewiththeclampingmeansoftheterminal basewhenpresent.Thiswaytheexternalwireterminalelementissecurelyhousedbythe terminalbaseasexplainedabove.25 Similarly,theexternalwireterminalelementis,accordingtoanembodiment, positionedinareflectionalsymmetricalmannerensuringconsistentalignmentandbalance. Thissymmetricalpositioningenhancescompatibilitywiththepoleterminal. Accordingtoathirdaspectoftheinventionakitofpartsisdisclosed30 comprisingthepoleterminalaccordingtothefirstaspectoftheinventionandtheexternal wireterminalelementaccordingtothesecondaspectoftheinvention. Accordingtoafourthaspectoftheinventionanelectricalsocketisdisclosed comprisingapoleterminalaccordingtothefirstaspectoftheinvention.Additionally,the35 2025 / 5016 BE2025 / 5016 10 electricalsocketcomprisestheexternalwireterminalelementaccordingtothesecond aspectoftheinvention. Anelectricalsocketgenerallycomprisesahousingwithatleasttwoprong- receivingopeningsconfiguredtoaccommodatestandardelectricalplugs.Insidethe5 housing,conductiveterminalsarestrategicallypositionedtoestablishsecureanelectrical contactwiththepinsofaninsertedplug.Theseterminalsarepoleterminalsasdescribed above.Thepoleterminalcomprisesaprong-receivingopeningalsodefinedasaninsertion opening.Thepoleterminalisconfiguredtoreceiveacontactpinofaplug,whichmeans thatthepoleterminalcomprisessaidinsertionopeningaswillbeexplainedbelowwherein10 thepincanbeinserted. BriefdescriptionoftheDrawings Exemplaryembodimentsoftheinventionaredescribedusingthefigures.15 Itistobeunderstoodthatthesefiguresmerelyserveasexamplesofhowtheinvention canbeimplementedandareinnowayintendedtobeconstruedaslimitingforthe scopeoftheinventionandtheclaims.Figure1isasideviewofthepoleterminalandtheexternalwireterminal20 elementinanunassembledconfigurationaccordingtoanembodimentoftheinvention; Figure2isasideviewcorrespondingtotheperspectiveofFigure1,inan assembledconfiguration; 25 Figures3and4areothersideviewsofthepoleterminalandtheexternalwire terminalelementinanunassembledconfigurationaccordingtoanembodimentofthe invention; Figures5and6arefurthersideviewsofthepoleterminalandtheexternalwire30 terminalelementinanassembledconfigurationaccordingtoanembodimentofthe invention; Figure7isatopviewofthepoleterminalandtheexternalwireterminal elementinanassembledconfigurationaccordingtoanembodimentoftheinvention;35 2025 / 5016 BE2025 / 5016 11 Figure8isabottomviewofthepoleterminalandtheexternalwireterminal elementinanassembledconfigurationaccordingtoanembodimentoftheinvention;and Figure9illustratesanelectricalsocketcomprisinganoutershellandahousing comprisingpoleterminalsaccordingtoanembodimentoftheinvention.5 Inthedrawings,thesamereferencenumbershavebeenallocatedtothe sameoranalogueelement. Detaileddescriptionofanembodimentoftheinvention10 Othercharacteristicsandadvantagesofthepresentinventionwillbederived fromthenon-limitativefollowingdescription,andbymakingreferencetothedrawingsand theexamples. 15 Figure1illustratesasideviewofthepoleterminal100andtheexternalwire terminalelement101inanunassembledconfigurationinaccordancewithanembodiment oftheinvention,providingadetaileddepictionofitsstructuralconfigurationandrelevant featuresforbetterunderstandingofitsdesignandfunction.Thestructuralconfigurationand keyfeaturesofthepoleterminal100andtheexternalwireterminalelement101willbe20 describedindetail,withspecificreferencetothevariouselementsandcomponents identifiedbythecorrespondingreferencenumeralsintheaccompanyingfigures.Tofurtherenhanceunderstanding,Figure2depictsthesamepoleterminal andtheexternalwireterminalelementinanassembledconfiguration200,thereby25 providingfurtherdetailsandfacilitatesamorecomprehensiveanalysisofitsdesignand functionality. Thepoleterminal100comprisesaterminalbase112withanopening108 throughwhichtheexternalwireterminalelement101canbeinsertedasshowninFigure2.30 Inthisassembledconfiguration200,oneormoreexternalconductorscanbeinsertedinto theopening108. Theterminalbase112furthercomprisesclampingmeans109forclampingthe externalwireterminalelement101wheninserted.Tothisend,theexternalwireterminal35 element101comprisesrecesses113.Withreference201itisillustratedhowtheclamping 2025 / 5016 BE2025 / 5016 12 means109clamptheexternalwireterminalelement101.Theterminalbase112furtherhas anelongatedopening106alongitslongitudinaldirection. Thepoleterminalfurthertworesilientcontactingarms102,103extendingfrom theterminalbase112fromtwocorrespondingconnectionjoints110,111.Thetworesilient5 contactingarms102,103formaninsertionopening104,105,wherebyreference104isthe bottomandreference105isthetop.WithreferencetoFig.5whichisatopsideview500of theassembledpoleterminal112withtheexternalwireterminalelement101,theinsertion opening105isconfiguredtoreceiveacontactpinofaplug.Inthisembodimentitisshaped asaroundshapealveole105.Thisinsertionopening103isthusthesecondaryinterfacefor10 connectingacontactpinfromanelectricalsocket.Itshouldbeunderstoodthatthe insertionpointatthebottomside104isnotsuitableforreceivingacontactbeingbecause oftheabsenceofanalveole. Whenacontactpinisinsertedintotheinsertionopening105,atightfitis15 createdensuringasecureengagementbetweenthecontactpinandthepoleterminal.A consequencethereofisthatthetworesilientcontactingarms102,103bendwherebythe outerlegsrotateoutwardswithconnectionsjoints102,103beingthepointsofrotation.In theabsenceofthedisclosedexternalwireterminalelement101theseconnectionjoints102, 103aredeflectedoutward.WithreferencetoFigures3and4whichareothersideviewsof20 thepoleterminal112andtheexternalwireterminalelement101inanunassembled configuration,thepoleterminal112comprisesanarrangementofprotrusions301.The protrusions301interfacewiththearrangementofprotrudingarms107ofthepoleterminal 101wheninsertedinthebaseterminal. 25 Intheassembledconfiguration200theexternalwireterminalelement101 ensuresthattheconnectionjoints110,111arekeptalignedwhenacontactpinisinserted intotheinsertionopening105.Theexternalwireterminalelement101furtherhasaresilient body402configuredtofacilitateaconnectionwithoneormoreconductors.Thisresilient body402ispositionedawayfromthearrangementofprotrudingarms107andrecesses103.30 Figures7and8areatoprespectivelyabottomviewthepoleterminal112 andtheexternalwireterminalelement101inanassembled.Fromtheseviewsitisclearthat thepoleterminal112andtheexternalwireterminalelement101arepositionedina reflectionalsymmetricalmanner.35 2025 / 5016 BE2025 / 5016 13 Figure9illustratesanembodimentofanelectricalsocketcomprisinga housing901thatcomprisesterminalpoles901,902co.