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外文资料--PORTABLE HYDRAULIC CRANE.doc

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外文资料--PORTABLE HYDRAULIC CRANE.doc

ABSTRACTThecranehavingagenerallytrapezoidalframewithacasterwheelateachcorner.Amastismountedonthefrontoftheframewithabracebetweeneachrearcornerandtopofthemast.Springloadedpinsareusedfortheseconnections.Aliftingramispivotallyconnectedtothemastandtoatelescopicboompivotedonthemast.Theframehasasocketoneachsideandatelescopiclegincludinginnerandoutertubesismountedineachsocket.Aspringloadedpinfixesthetubesrelativetoeachother.Theendofeachleghasawheel.Eachlegcanpivotrelativetoitssleevetoenableraisingthelegtopositionthedistalendnearthemast.Thelegscanbedisconnectedfromthesleevesandalockingdevicepreventsremovalofthelegs.18Claims,3DrawingSheets1PORTABLEHYDRAULICCRANEThisisacontinuationofU.S.patentapplicationSerNo.281,490,filedDec.8,1988nowabandoned.FIELDOFTHEINVENTIONTheinventionrelatestoportablehydrauliccranesofthetypeusedinautomotivemaintenanceandrepairandinothersimilarapplicationsBACKGROUNDOFTHEINVENTIONPortablehydraulicallyoperatedcranesarecommonlyusedinautomotiverepairshopsandservicestations,aswellasbyindividualsinhomeautorepairandareprovidedbyrentalagenciesforhomeautomoliverepair.Whenaportablecraneisnotinuse,itmustbestored.Somepriorartcranesaredesignedsuchthattheycanbetakenaparttobestoredinmorecompactspace.Othercranesaredesignedsuchthatvariousportionsofthecranescanbefoldedforstorage.AnexampleofapriorartcraneincludingsomecomponentswhichcanbedisassembledforstorageisillustratedintheZehrungetal.U.S.Pat.No.3,521,860issuedJuly28,1970.Thatcranehasthedisadvantageofrequiringaseparatecartforstorageormovementofthecranewhenitisdisassembled.SUMMARYOFTHEINVENTIONThisinventionprovidesanimprovedportablecranewithlegswhichcanbeeitherreadilyremoved,oralternatively,pivotedtoafoldedstorageposition.Thecranealsoincludesameansforsupportingthecraneboomsuchthatitcanbeeitherreadilyremoved,oralternalively,foldedtoastorageposition.Thecraneembodyingtheinventionisalsoprovidedwithwheelswhichfacilitatemovementofthecraneandcanserveasdollywheelswhenthefoldedcraneistiltedbackformovewent.Nospecialtoolsareneededfordisassemblyofthecranenorfoldingofthecranetoafoldedstorageposilion,andthelocks,pinsandthelikewhichholdthecranepartsinassembledpositionarebuiltinorotherwiseretainedtoreducethelikelihoodoftheusersubstitutinginferiororweakerparts.Morespecifically,thisinventionprovidesacranehavingagenerallytrapezoidalbaseorframeonwhichamastismounted.Aboomissupportedbytheupperendofthemast.Eachofthedivergingsidesofthebaseorframeincludesatubeorsocketwhichhousesanendofatubularlegassemblyintelescopingrelation.Alockmemberorlatchismountedinthesocketandseleclivelyinterfereswithremovalofthetubularlegfromthesocketbyengagingabracketfixedinsidethetubularleg.ThelatchcanbeselectivelymovedtoanoninterferingpositionbymanuallydepressinganactuatortabtopermitremovalofthetelescopinglegfromthesocketAnotherfeatureofthecraneembodyingtheinvenlionisthatthebracketinthetubularlegincludesahookedendwhichcanengagethelatchmountedinthesocketandserveasapivotsupportingthelegsuchthatitcanswingupwardlymorethan900toastorageposilionAnotherfeatureofthecraneembodyingtheinvenlionisthatthemast,boompowerunitandsidebracescanbeeasilyremovedwithouttools.Themastisatubewhichfitsinasocketonthebase,andsidebracesare2connectedtothemastandframebysimplepinswhichcantbelost.Thecranecanbefoldedintothestoragemodebyfoldingthelegsandboomtopositionsgenerallyparallel

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