Mechanicalarmsystemforopeningadoor.docx

Mechanicalarmsystemforopeningadoor.docx

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Mechanicalarmsystemforopeningadoor

Mechanicalarmsystemforopeningadoor

BACKGROUNDOFTHEINVENTION

1.FieldoftheInvention

Thepresentinventionrelatestoautomaticdooropenersandothersystemsforopeningorclosingadoor.Moreparticularly,thepresentinventionrelatestoamechanicalarmsystemforopeningadoor,especiallyaSensitiveCompartmentedInformationFacility（SCIF）door,inwhichnocomponentofthemechanicalarmsystemismountedon,ormakespermanentcontactwith,thedoor.

2.BackgroundArt

Automaticdooropeners,formanydifferentapplications,arewellknownintheart.Automaticdooropenersmaybeequippedondoorsofpublicfacilitiestoallowpassagethroughthedoorwayofpeoplewithouttheirmanualoperation.Automaticdooropenersmayincorporatehydraulic,pneumatic,andelectromechanicaldevices.Forexample,aconventionalautomaticdooropenerforopeningorclosingadoorincludesanacontrolunit,anactuatordrivingadriveshaftandanarticulatedopenerarmextendingbetweenthedriveshaftandthedoor.Anendoftheopenerarmiseitherpermanentlymountedononeofthedoororthedoorframe,withtheactuatoranddriveshaftcombinationmountedontheotherofthedoorframeorthedoor.Theopenerarmrespondstomovementofthedriveshafttoextendorcontractsoastomovethedoortoanopenorclosedposition,respectively.Thecontrolunitmayincludeadjustabletimersandsensorstocontrolthemovementofthedoor,andtoidentifywhenanobstacleisencounteredinthedoor'spathway.Typically,thedooropenermustcompleteitsopeningprocessofplacingthedoorintheopenpositionbeforeclosureofthedoorcanbeinitiated.

Consequently,suchaconventionaldooropenerisunacceptableforusewithaSCIFdoor.TherequirementsforanSCIFdooraredictatedbytheU.S.government,andtwooftheserequirementsprovidethat,exceptforthelock,keybypass,adoorcloser,andcrash-putbar,nothingadditionalcanbeinstalledwhichmakespermanentcontactwiththedoorandthatthedoormustbeabletoreturntoitsclosedstate,quickly,atanypointinitsforwardopeningcycle.

Whatisneeded,therefore,isamechanismforautomaticallyopeningadoor,inwhichnoneofthemechanism'scomponentsaremountedonthedooritself,andfurtherallowsforclosureofthedoorfromanypositionduringthedooropeningprocess.Thepresentinventionsatisfiestheseandotherneeds,aswillbemadeapparentbythedescriptionofthepresentinventionthatfollows.

BRIEFSUMMARYOFTHEINVENTION

Amechanicalarmsystemforopeningadoorispresented.Inoneembodiment,thesystemincludesanactuatorassemblyhavinganoutputshaftandanarmdrivenbytheoutputshaftformovingthedoorfromaclosedpositiontoanopenposition.Theactuatorassemblyismountedtoasupportmemberadjacentthedoor,andthearmselectivelycontactsthedoortomovethedoortowardtheopenposition.Thearmismoveablebetweenapositioninwhichthearmcontactsthedoorintheopenpositionandaretractedpositioninwhichthearmisfreefromcontactwiththedoorintheclosedposition.Thedoormaybemanuallyopenedaswell.Theactuatorassemblymaybesupportedonawallabovethedoor.

Inoneembodiment,thearmpivotsinafirstdirectionforcontactingthedoorandaseconddirectionforretractingfromcontactwiththedoor,thearmpivotingwithrotationoftheoutputshaft.Theactuatorassemblymayincludeahydraulicrackandpinionrotaryactuatorhavingapistonthatdrivesarackwhichmesheswithapinion,andtheoutputshaftiscoaxialwiththepinionandrotateswithrotationofthepinion.Themechanicalarmsystemmayincludeacontrollerunit,whichactivatesanddeactivatesthehydraulicactuatorandcontrolsarotationaldirectionoftheoutputshaftsoastopivotthearminthefirstdirectionortheseconddirection.Thesystemmayfurtherincludeahydraulicpumpforsupplyingfluidtothehydraulicactuator,andthecontrollerunitcontrolsstartandstopofthehydraulicpumpsoasactivateanddeactivatethehydraulicactuator,andcontrolsthedirectionoffluiddisplacementbythepumpsoastocontroltherotationaldirectionoftheoutputshaft.Anopenswitchmaybeincludedforinitiatingmovementofthedoortowardtheopenpositionunderforceofthearm.Whentheopenswitchhasbeenactivated,thecontrollerunitcontrolstherotationaldirectionoftheoutputshaftsoastopivotthearminthefirstdirection,wherebythearmcontactsthedoorandmovesthedoortowardtheopenposition.Astopswitchmaybeincludedforabortingmovementofthedoortowardtheopenpositionunderforceofthearm.Apressureoverloadsensormaybeincludedforsensingwhenthehydraulicpressureoffluidsuppliedtothehydraulicactuatorrisesaboveapre-setlimit.Whenthepre-setpressurelimith