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  • Stabilus gas springs

    Copyright SKF 2004The contents of this publication are thecopyright of the publisher and may notbe reproduced (even extracts) unlesspermission is granted. Every care hasbeen taken to ensure the accuracy ofthe information contained in this publi-cation but no liability can be acceptedfor any loss or damage whether direct,indirect or consequential arising out ofthe use of the information containedherein.Previous catalogues, in which the datadeviate from those given here, arerendered invalid. The right is reservedto make changes necessitated bytechnological developments.

    Catalogue 5507 EJune 2004

    Printed in France

    SKF is a registered trademarkof SKF AB, Sweden.

    The gas springs are developed and produced in Germany by STABILUS GmbH.

    Linear Motion

  • General Other productsSKF GroupThe SKF Group is an internationalindustrial corporation owned by SKFSweden AB. Founded in 1907, thecompany has some 39 000 employ-ees, 80 manufacturing sites and asales network via its own sales com-panies, distributors and dealers cover-ing 150 countries around the world.SKF is the world leader in the rollingbearing business.

    SKF Linear MotionSKF Linear Motion belongs to theSKF Group and is specialised in themanufacturing and sales of a widerange of high precision components,units and systems for linear move-ments, providing solutions for guiding,driving, actuation and positioningtasks. In addition, SKF Linear Motionalso offers a large assortment of pro-ducts which are in synergy to the line-

    ar motion range and are providingcomplete solutions for applications.SKF Linear Motion comprises 4 pro-duct lines with 10 specialised salescompanies in Europe and NorthAmerica; additionally, product availabi-lity and product application support isprovided worldwide by the internatio-nal sales network of the SKF Group.

    A complete range from a single source for alllinear motion functions.Guiding Driving

    Actuation Positioning

    Furniture gas springs. Gas springs for comfortable table heightadjustment.

    Stainless steel gas springs. Stab-O-Focs for opening and clo-sing system.

    2 SKF SKF 99

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    !NOTHERSUPPORTLOCATIONFORTHEPISTONRODISTHEGUIDEELEMENTATTHEENDOFTHEPRESSURETUBE)MMEDIATELYBEHINDITISTHESEALTHATPREVENTSTHEPRESSURIZEDGASFROMESCAPINGWHICHINEVITABLYWOULDREDUCETHEFUNCTION$EPENDINGONTHEMOUNTINGORIENTATIONOFTHEGASSPRINGTHEREAREDIFFERENTSEALSYSTEMSTOENSURETHEHIGHESTLEVELOFFUNCTIONALSAFETY

    &IG SHOWS THREE GAS SPRING VARIANTSWHICH ONLY DIFFER IN THESTRUCTUREOF THEIRSEALANDGUIDEELEMENTS6ARIANT)WITH THESTANDARDSEALSHOULDPREFERABLYBEINSTALLEDWITHTHEPISTONRODPOINTINGDOWNTOENSURECONTINUOUSLUBRICATIONOFTHESEALWITHTHELUBRICANTACCUMULATINGINTHESEAL6ARIANT))HOWEVERHASTHE34!"),53DOUBLESEALSYSTEMWHICHALLOWSFORMOUNTINGINANYORIENTATION%VENIF THEGASSPRINGISMOUNTEDWITHTHEPISTONRODPOINTINGUPWARDTHEOILENCLOSEDBETWEENTHESEALSENSURESTHELUBRICATIONOFBOTHSEALS4HESECONDSEALEXTENDSTHELIFEOFTHEGASSPRINGTHEREFORETHISMODELISUSEDINAPPLICATIONSTHATREQUIREAHIGHNUMBEROFDUTYCYCLES&IG

    6ARIANT)))HASTHE34!"),53OILCHAMBER4HISVARIANT ISSUITABLEFORAPPLICATIONSWHERE THEGASSPRINGSWIVELSWHEN THEAPPLICATION ISADJUSTEDTHUSCHANGINGITSPOSITION)FTHEGASSPRINGISMOUNTEDWITHTHEPISTONRODPOINTINGDOWNITlLLSUPTHEOILRESERVOIRINWHICHTHEOILmOWSALONGTHEFREERINGSLOTONTHEOILCHAMBERJACKET)FTHEGASSPRINGTHENSWIVELSFOREXAMPLEWHENTHEAPPLICATIONISOPENEDANDTHEPISTONRODPOINTSUPWARDTHEREWILLSTILLBEENOUGHOILINTHERESERVOIRTOLUBRICATETHESEAL!LLSEALSYSTEMSCANBEAUGMENTEDBYAiFELTCHAMBERwUPONREQUEST)NTHATCASEAFELTRINGIMPREGNATEDWITHSPECIALGREASEPROVIDESADDITIONALLUBRICATIONOFTHEPISTONRODACROSSTHEENTIRESTROKE4HISREDUCESTHEFRICTIONANDBREAKAWAYFORCEFURTHERTHUSENSURINGTHEOPTIMUMFUNCTIONOFTHEGASSPRINGEVENINSENSITIVEAPPLICATIONS

    $USTANDCONTAMINANTDEPOSITSONTHEPISTONRODCANHAVEANEGATIVEIMPACTON THE LIFEOFGASSPRINGS )NENVIRONMENTALCONDITIONS THATARELESS THANOPTIMALAPROTECTIVE TUBEOFFERSPROTECTIONAGAINSTCONTAMINANTSDUSTMOISTUREORPOSSIBLEMECHANICALIMPACTONTHEPISTONROD)NTHATCASEAMOUNTINGORIENTATIONSHOULDBESELECTEDTHATPREVENTSTHEPROTECTIVETUBEFROMGETTINGlLLEDWITHCONTAMINANTSORMOISTURE)NORDERTOIMPROVETHEFUNCTIONALSAFETYANDCORROSIONRESISTANCEEVENFURTHERADDITIONALPROTECTIVECAPSMADEOFPLASTICPROTECTTHECRIMPINGANDBEADINGAREAOFTHEGASSPRINGAGAINSTMOISTUREDUSTANDCONTAMINANTS

  • 3+&

    4ECHNICALINFORMATION

    ,)&4/-!4SEALANDGUIDEELEMENT

    ,)&4/-!4%ND&ITTINGS

    !LARGEVARIETYOFENDlTTINGSALLOWSFORFASTANDEASYINSTALLATIONOFTHEGASSPRINGINTHEAPPLICATION&IG SHOWSASELECTIONOF3TABILUS,)&4/-!4GASSPRINGENDlTTINGSFORMOUNTINGONTHEPISTONRODSIDEORONTHEPRESSURETUBESIDE

    ,)&4/-!4'AS3PRINGWITH(YDRAULICAND$YNAMIC-OTION$AMPING

    4OAPPROACHTHEENDPOSITIONCOMFORTABLYENDPOSITIONDAMPINGISPROVIDED INMOSTAPPLICATIONCASES &IGS A AND B SHOW THE TWOPRINCIPLESTHATCANBEUSEDFORDAMPINGTHEPISTONRODMOTIONHYDRAULICANDDYNAMICDAMPING

    ,)&4/-!4WITHHYDRAULICDAMPING

    4HE,)&4/-!4WITHHYDRAULICDAMPINGTAKESADVANTAGEOFTHEmOWRESISTANCEOFTHEPISTONNOZZLEWHICHISLOWERINGAS&IGAPNEUMATICDAMPINGRANGESTHANINOIL&IGAHYDRAULICDAMPINGRANGES)FTHEGASSPRINGISMOUNTEDVERTICALLYWITHTHEPISTONRODPOINTINGDOWNTHEOILACCUMULATESATTHESEALANDGUIDEELEMENTOFTHEGASSPRING!SSOONAS THEPISTONDIPS INTO THEOILWHEN THEPISTONROD ISPUSHEDOUTTHEPISTONRODMOVESMUCHMORESLOWLY7ITHACOMBINATIONOFDIFFERENTOILSANDLABYRINTHPISTONSTHISBRAKINGEFFECTCANBECUSTOMIZEDTOTHEAPPLICATION4HEPISTONRODEXTENSIONSPEEDSTHATCANBESELECTEDFORHYDRAULICDAMPINGRANGEFROMTOMS4HELENGTHOF

    THEHYDRAULICDAMPINGSECTIONISGIVENBYTHEAMOUNTOFOILINTHEDEVICE(OWEVERTHISDAMPINGEFFECTCANONLYBEUTILIZEDINAVERTICALMOUNTINGORIENTATIONWITHTHEPISTONRODPOINTINGDOWN

    3ELECTIONOF,)&4/-!4STANDARDlTTINGS

    ,)&4/-!4WITHHYDRAULICDAMPING

    'AS3PRINGSFOR&ORCE3UPPLY

  • 3+&

    ,)&4/-!4WITHHYDRAULICDAMPING

    5NLIKEHYDRAULICDAMPINGTHE,)&4/-!4WITHHYDRAULICDAMPINGCANBEMOUNTEDINANYORIENTATION4HEEXTENSIONSPEEDOFTHEGASSPRINGISCONTROLLEDBYALONGITUDINALGROOVEINSIDETHEPRESSURETUBE)NTHISCASETHEPISTONRODDOESNOTHAVEAmOWCHANNELSOTHATTHEGASmOWSTHROUGHTHEFREEGROOVECROSSSECTIONWHENTHEPISTONRODISADJUSTED"YVARYINGTHEGROOVEGEOMETRYITISPOSSIBLETOADJUSTTHEMOTIONSPEEDOFTHEPISTONRODOVERTHEENTIRESTROKETHUSOPTIMIZINGITTOTHERESPECTIVEAPPLICATION&IGBSHOWSANEXAMPLEOFTHEEXTENSIONSPEEDBEHAVIOROFAGASSPRINGWITHAGROOVECROSSSECTIONTHATTAPERSOFFTOWARDTHEENDPOSITIONOF THESTROKE4HEMOTIONPROCEEDSATACONTINUOUSLYDECREASINGEXTENSIONSPEEDUNTILTHEPISTONRODCOMESALMOSTTOAHALTTHUSENSURINGASMOOTHSTOPOFTHEAPPLICATION7HENUSINGTHISTECHNOLOGYDAMPINGINTHECOMPRESSIONDIRECTIONISALSOPOSSIBLETHISCANBEUSEFUL INAPPLICATIONSUCHASCARHOODS,IKEWISEDIFFERENTGROOVEGEOMETRIESAREPOSSIBLEFOREXAMPLEFORDAMPEDAPPROACHINGOFINTERIMPOSITIONS

    ,)&4/-!4WITHDYNAMICDAMPING

    ,)&4/-!4WITHA$ECREASINGOR0ROGRESSIVE3PRING#HARACTERISTIC#URVE

    3OME APPLICATIONS DO NOT REQUIRE A LINEAR BUT A SPECIALLY ADJUSTEDSTROKECONTROLLEDFORCESUPPLY3UCH ISOFTENTHECASE INENDPOSITIONSOFAPPLICATIONSTHATREQUIREDISPROPORTIONATELYHIGHORLOWSPRINGFORCESRELATIVETOTHEMAINADJUSTMENTRANGE4HE,)&4/-!4GASSPRING ISPARTICULARLY SUITED TO THIS SINCE ITS SPRINGCHARACTERISTIC CURVECANBEEASILYCUSTOMIZEDTOTHEAPPLICATIONBYSIMPLEADDITIONOFCOILSPRINGS

    0ROGRESSIVE3PRING#HARACTERISTIC#URVE

    !COILSPRINGBETWEENPISTONANDPRESSURETUBEBOTTOMCREATESAPROGRESSIVESPRINGCHARACTERISTICCURVEASSHOWNIN&IG 4HEGASSPRINGISSUPPORTEDBYTHEFORCEOFTHECOILSPRINGWHICHINCREASESTHEGAS SPRING FORCEWHEN THE PISTON ROD IS COMPRESSED4HIS SOLUTION ISSUITABLEINCASESWHEREAPARTICULARLYHIGHEXTENSIONFORCEINTHECOMPRESSEDPOSITIONOFTHEGASSPRINGISNEEDED

    $ECREASING3PRING#HARACTERISTIC#URVE

    )FTHECOILSPRINGISPLACEDBETWEENTHEPISTONANDTHESEALONTHEPISTONRODTHEGASSPRINGFORCEISREDUCEDBYTHEFORCEOFTHECOILSPRING

    4HERESULTISADECREASINGSPRINGCHARACTERISTICCURVE4HESPRINGFORCEOFTHEEXTENDEDGASSPRINGISTHUSAPPROPRIATELYLOWERTHANTHEFORCEOFTHESTANDARDGASSPRING

    4HESPRINGCHARACTERISTICCURVESOFBOTHVARIANTSCANBEVARIEDBYSELECTINGADIFFERENTCOILSPRINGLENGTHITDETERMINESTHEBREAKPOINTSOFTHESPRINGCHARACTERISTICCURVEANDTHECOILSPRINGFORCEITDETERMINESTHESLOPEOFTHESPRINGCHARACTERISTICCURVEINBREAKPOINTS/FTENARUBBERCUSHIONISUSEDINSTEADOFTHECOILSPRINGSOTHATINADDITIONTOTHESPRINGEFFECTOFTHECUSHIONTHEENDSTOPISDAMPEDWHENTHEPISTONRODISPUSHEDINOROUT!COMBINATIONOFBOTHVARIANTSISALSOUSED

    ,)&4/-!4WITHPROGRESSIVEANDDECREASINGSPRINGCHARACTERISTICCURVE

    ,)&4/-!4WITH%ND0OSITION,OCKING

    )F LEGAL REQUIREMENTS DEMAND SAFETY PRECAUTIONS AGAINST UNINTENTIONAL ADJUSTMENT OR IF THEGASSPRING IS SUBJECTED TOAPPLICATION FORCESTHAT EXCEED ITS EXTENSION FORCE ADDITIONAL STOP DEVICES ARE THE IDEALSOLUTION7ITH INTEGRATED MECHANICAL STOP ELEMENTS &IG THE,)&4/-!4CANLOCKTHEAPPLICATION!TYPICALAPPLICATIONEXAMPLEAREMOBILE SALES STANDS INWHICH THE,)&4/-!4CANBEUSED TOOPEN

  • 3+&

    4ECHNICALINFORMATION

    mAPSASWELLASALOCKINGELEMENTAGAINSTUNINTENTIONALCLOSINGEGUNDERAHEAVYWINDORSNOWLOAD)FMORETHANONEGASSPRINGISUSEDIN AN APPLICATION IT IS USUALLY SUFlCIENT TO EQUIP JUST ONE OF THE GASSPRINGSWITHTHEMECHANICALSTOPELEMENT

    4HEADVANTAGESOFAMECHANICALENDPOSITIONLOCKIN,)&4/-!4GASSPRINGSCANBEPUTINANUTSHELLn,OCKINGANDUNLOCKINGDIRECTLYINTHEADJUSTMENTELEMENTn!DDITIONALPROTECTIONAGAINSTUNINTENTIONALCLOSINGn!BSORPTIONOFEXTERNALFORCESSUCHASWINDANDSNOWLOADS

    3TABILUSOFFERSTWOGASSPRINGVARIANTSWITHAMECHANICALSTOPELEMENTFORLOCKINGFORCESOFUPTO.MAX

    %XTERNALMECHANICALLOCKING

    )NTHISVARIANTASUPPORTTUBEISlTTEDONTHEPISTONRODENDWHICHPIVOTSOUTWHENTHEGASSPRINGREACHESTHEFULLYEXTENDEDPOSITION)FTHEEXTERNALLOADEXCEEDSTHEGASSPRINGFORCETHETUBEWILLSUPPORTITSELFONTHEFRONTSIDEOFTHEPRESSURETUBETHUSPREVENTINGTHEPISTONRODFROMCOMPRESSING&IG 4ORELEASETHEPOSITIONALLOCKINGTHESUPPORTTUBEMUSTBEREMOVEDFROMTHELOCKEDPOSITIONBYPRESSINGTHEBUTTONLABELEDi02%33wATWHICHPOINTITSWIVELSOUT)NADDITIONTOTHELOCKINGFUNCTIONTHESUPPORTTUBEOFFERSPROTECTIONAGAINSTCONTAMINATIONOFTHEPISTONROD

    )NTERNALMECHANICALLOCKING

    4HEDESIGNOFTHISLOCKINGFUNCTIONISSIMILARTOTHATOFTHEBALLPOINTPENPRINCIPLE!SSHOWNIN&IG ITISLOCATEDINTHEPRESSURETUBE4HEMECHANICALLOCKKICKSINWHENTHEPISTONRODISPUSHEDINSLIGHTLYFROMTHEEXTENDEDPOSITION

    ,)&4/-!4WITHEXTERNALANDINTERNALENDPOSITIONLOCKING

    4OENSURE THAT THEPOSITIONAL LOCKDOESNOT RELEASEAUTOMATICALLY THELOADONTHEPISTONRODMUSTBEGREATERTHANTHEEXTENSIONFORCEOFTHEGASSPRINGTHEREFORETHESPRINGFORCEOFTHIS,)&4/-!4GASSPRINGSHOULDBELOWERTHANTHEEXTERNALLOADEXERTEDBYTHEAPPLICATION4ORELEASETHELOCKINGTHEPISTONRODSHOULDBEPUSHEDBRIEmYINTOTHEDIRECTIONOFEXTENSION3INCETHEEXTERNALLOADEXCEEDSTHEEXTENSIONFORCETHE,)&4/-!4 COMPRESSES IN A DAMPEDMANNER! STICKER ON THEGASSPRINGSHOWSTHEPROPERPROCEDURE!MAJORADVANTAGEOFTHISVARIANTCOMPAREDWITHEXTERNALENDPOSITIONLOCKINGIS2ELEASINGTHEGASSPRINGANDADJUSTINGTHEAPPLICATIONCANBEDONEWITHONEHAND

    2%)",)&4/-!4

    )N ADDITION TO FORCE SUPPLY SOME APPLICATIONS ALSO REQUIRE VARIABLE POSITIONING CAPABILITY OVER THE ENTIRE ADJUSTMENT RANGE 4HE2%)",)&4/-!4FULlLLSBOTHREQUIREMENTS&IG

    2%)",)&4/-!4STRUCTURE

    4HEONLYDIFFERENCETOTHE,)&4/-!4ISAFRICTIONELEMENTINTEGRATEDINTHEPISTONPACKAGEWHICHINCREASESTHEFORCEFORPUSHINGINTHEPISTONROD!TTHESAMETIMETHISREDUCESTHEEXTENSIONFORCEOFTHEGASSPRING4HESPRINGCHARACTERISTICCURVEOFTHE2%)",)&4/-!4ISTHEREFOREBROADERTHANTHATOFTHE,)&4/-!4GASSPRING&IG

    'AS3PRINGSFOR&ORCE3UPPLY

  • 3+&

    2%)",)&4/-!4SPRINGCHARACTERISTICCURVEANDHOLDINGRANGEOFTHEAPPLICATION

    )FTHECHARACTERISTICCURVEOFTHEAPPLICATIONLOAD&!ISWITHINTHESPRINGCHARACTERISTICCURVEOFTHE2%)",)&4/-!4THEAPPLICATIONCANBEVARIABLYPOSITIONEDACROSSTHEENTIREADJUSTMENTRANGE$UETOTHERELATIVELY LOWiHOLDING FORCEw THEAPPLICATIONCANBEOPENEDANDCLOSEDEASILYWITHMINIMALMANUALSUPPORT)FA,)&4/-!4GASSPRINGWERETOBEUSEDFORTHEAPPLICATIONLOADCURVESHOWNTHEAPPLICATIONiHOLDINGRANGEwCOMPAREDWITHTHE2%)",)&4/-!4WOULDBEREDUCED)NRANGES!AND",)&4/-!4ENSURESAUTOMATICOPENINGORCLOSINGOFTHELIDWHEREASTHE2%)",)&4/-!4PROVIDESFORFULLYVARIABLEPOSITIONINGOFTHELIDINTHESERANGES

    34!"),53'AS3PRING(9$2/,)&4

    *USTLIKETHE2%)",)&4/-!4THE(9$2/,)&4PROVIDESFORCESUPPLYANDFULLYVARIABLEPOSITIONINGINTHEAPPLICATION(OWEVERTHEPISTONOFTHE(9$2/,)&4FEATURESAPRESSUREVALVEONTHEBACKOFTHEPISTON4HEVALVEPREVENTSTHEGASEXCHANGEORTHECOMPRESSIONOFTHEPISTONRODUNTIL THESPRINGPRELOADEDSEAL RELEASES THEPISTONBORE"ECAUSEOF THESPRINGLOADINGOF THESEAL THE FORCENEEDEDTOPUSH IN THEPISTONRODISGREATERTHANTHEFORCEOFTHEREGULAR,)&4/-!4GASSPRING&IG

    4HECOMPRESSIONFORCEOFTHEGASSPRINGANDORTHEBANDWIDTHOFTHESPRINGCHARACTERISTICSCANBECUSTOMIZEDTO THERESPECTIVEAPPLICATIONBYTHERIGHTCHOICEOFVALVECOILSPRING&IG

    (9$2/,)&4WITHhHOLDSINKANDFALLRANGE

    4HEEXTENSIONFORCEOFTHE(9$2/,)&4ISSELECTEDSOTHATTHEPISTONRODINTHEAPPLICATIONCANONLYBEEXTENDEDWITHADDITIONALFORCEEGMANUALFORCEREQUIREDTOOPENALID)FTHEEXTERNALLOADOFTHEAPPLICATIONISSMALLERTHANTHECOMPRESSIONFORCEOFTHE(9$2/,)&4THELIDREMAINSINITSPOSITIONWITHINTHEiHOLDINGRANGEw&IG

    $EPENDING ON THE DESIGN OF THE (9$2/,)&4 THE HOLDING FUNCTION CAN BE ACTIVE ACROSS THE ENTIRE ADJUSTEMENT RANGE AS IN THE2%)",)&4/-!4OR INONEORMOREPARTIALRANGESOF THEAPPLICATION)NADDITIONTOTHEiHOLDINGRANGEw&IGSHOWSTWOOTHERFUNCTIONRANGESOFTHEAPPLICATION4HEiSINKRANGEwISACHIEVEDWITHONEORMOREGROOVESINTHEPRESSURETUBEWHICHSERVEASPISTONBYPASSESTHUSNEUTRALIZINGTHEFUNCTIONOFTHEPRESSUREVALVE4HEiFALLRANGEwISCREATEDBYEXPANDINGTHEPRESSURECYLINDERCROSSSECTION)FTHEPISTONREACHESTHEiSINKRANGEwWHENTHEPISTONRODISPUSHEDINITREDUCESTHEGASSPRINGFORCEORTHEMANUALFORCENEEDEDTOCLOSETHELID)NTHEiFALLRANGEwTHELIDTHENCLOSESAUTOMATICALLY

    34!"),53'AS3PRING(9$2/,)&444HEOPENINGANDCLOSINGFORCESOFAmAPWITHGASSPRINGSAREAFFECTEDBYTHEAMBIENTTEMPERATUREDUETOLAWSOFPHYSICS!TLOWERTEMPERATURESTHElLLINGMEDIUMNITROGENCONTRACTSANDTHESPRINGFORCEDECREASES!THIGHERTEMPERATURESTHElLLINGMEDIUMEXPANDSANDTHESPRINGFORCEINCREASES4HE(9$2/,)&44WASDEVELOPEDTOKEEPTHETEMPERATUREINmUENCEASLOWASPOSSIBLEONTHEFUNCTIONALFORCESOFAmAP4HISDEVICEISEQUIPPEDWITHANADDITIONALBIMETALCONTROLLEDPISTONVALVE!TTEMPERATURESABOVE#THEVALVEISOPEN!TTEMPERATURESBELOW#THEVALVECLOSESANDINCREASESTHEHOLDINGFORCE7HILEACHIEVINGASAFEHOLDINGFORCEATTEMPERATURESASLOWAS#THISFUNCTIONALLOWSFORALOWEREXTENSIONFORCE

    4HEOVERALLLOWERFORCELEVELRELIEVESTHECOUPLINGPOINTSOFTHEGASSPRINGWHICHMAKESCLOSINGWITHLESSEFFORTMUCHMORECOMFORTABLE&IG

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  • 3+&

    4ECHNICALINFORMATION

    3TRUCTUREOF(9$2/,)&44

    34!"),53'AS3PRING+/-"),)&47HATMAKESTHE+/-"),)&4SPECIALAREITSTWOPRESETTABLEPOSITIONSOFTHEEXTENDEDLENGTHWHICHCANBEAHELPFUL FEATUREINAPPLICATIONSSUCHASTAILGATESOFTALLVEHICLESVANSTOPREVENTTHEMFROMBUMPINGINTO THEGARAGEROOFORDOOR3HORTPERSONSCAN LIMIT THEOPENINGANGLE OF THE TAILGATEMAKING CLOSING IT EASIER4O ACHIEVE THIS FUNCTIONTHE+/-"),)&4HASASWITCHON THEPISTON RODWHICHOPENSORCLOSESTHEVALVEINTHEPISTON&IG4HEPRESSURETUBEHASAGROOVETHATACTSASABYPASSINACERTAINRANGE$UETOTHISCOMBINATIONTHE+/-"),)&4ISPARTLYALOCKINGANDPARTLYANONLOCKINGGASSPRINGnASTHEPRODUCTNAMEINDICATES

    3TRUCTUREANDAPPLICATIONSAMPLE+/-"),)&4

    )FTHEVALVEREMAINSOPENSWITCHPOSITIONTHEPISTONRODEXTENDSFULLY(OWEVERIFTHEVALVEISCLOSEDSWITCHPOSITIONTHEPISTONRODEXTENDSONLYPARTIALLYNAMELYINTHEGROOVEAREA4OEXTENDITFURTHERALLTHATISNEEDEDISACHANGEINSWITCHPOSITIONWHICHOPENSTHEVALVE$UETOTHESPECIALDESIGNOFTHEPISTONTHEPISTONRODCANBECOMPRESSEDWITHOUTLOCKINGREGARDLESSOFTHEPRESETSWITCHPOSITION

    34!"),53'AS3PRING).4%234/04HE).4%234/0MAKESITPOSSIBLETOLIMITTHEOPENINGANGLESOFmAPSWHICH ISUSEFUL FOR TAILGATES INGARAGESWITH LOWCEILINGSOR FORHOODSWITHANORMALOPENINGPOSITIONANDASERVICEPOSITION&ORTHISPURPOSETHEFUNCTIONOFA,)&4/-!4WITHHYDRAULICDAMPINGISCOMBINEDWITHTHEHOLDINGFUNCTIONOFA(9$2/,)&45NLIKEINTHE(9$2/,)&4THEHOLDINGFORCEOFTHE).4%234/0ACTSINTHEEXTENSIONDIRECTION$EPENDINGONTHEAPPLICATIONTWODIFFERENTSYSTEMSCANBEUSED

    ).4%234/0WITHOUTHOLDINGRANGE

    )NTHElRSTPARTOFTHESTROKERANGE)THE).4%234/0WORKSLIKEAGASSPRINGWITHDYNAMICDAMPING4HEDEVICESTOPSSMOOTHLYATTHEHOLDINGPOINT7ITHMANUALSUPPORTINTHEOPENINGDIRECTIONTHEVALVEINTHEPISTONOPENSGASISEXCHANGEDBETWEENTHEFUNCTIONAREASANDTHEHOLDINGPOINTISOVERCOME4HEHOLDINGFORCEMUSTBECHOSENASTOENSURETHESTOPFUNCTIONATATEMPERATUREOF#)NTHESECONDPARTOFTHESTROKERANGE)))THEDEVICEACTSLIKEANORMALGASSPRINGANDAPPROACHESTHEENDSTOPINADAMPEDMOTION

    $IFFERENTOPENINGFUNCTIONSOFTHE).4%234/0

    4HE CLOSING OF A mAP WITH ).4%234/0 IS THE SAME AS WITH A,)&4/-!4

    ).4%234/0WITHHOLDINGRANGE

    )NTHElRSTPARTOFTHESTROKETHEDEVICEACTSASDESCRIBEDBEFORE)NTHEHOLDINGRANGEWHICHISTHELATTERPARTOFTHESTROKETHEPISTONVALVEISOPENEDWITHADDITIONALMANUALEFFORTTHUSENABLINGCONTINUOSPOSITIONINGOFTHEmAPUNTILTHEENDSTOP

    34!"),53'AS3PRING%,%+42/,)&44HE%,%+42/,)&4 HAS THE SAME TECHNICAL PROPERTIES AS THE STANDARD,)&4/-!4%QUIPPEDWITHASLIDINGCONTACTATTHEPISTONPLASTIC END lTTINGS ANDAN INSULATING PLASTIC SHRINKTUBE &IG THE%,%+42/,)&4CANALSOCONDUCTANELECTRIC CURRENTOF!MAXAT6&LATCONNECTORSPROVIDEDATTHEPISTONRODANDPRESSURETUBEENDSACT AS ELECTRICAL CONNECTIONS "ARE OR INTERFERING CABLE CONNECTIONSSUCHASCABLESTOTHEREARWINDOWWIPERORHEATERINTHEVEHICLECANBE

    'AS3PRINGSFOR&ORCE3UPPLY

  • 3+&

    OMITTED )NAPPLICATIONSWHERE THE%,%+42/,)&4 IS TOBEUSEDASAGROUNDCONNECTORONLYMETALlTTINGSCANREPLACETHEPLASTIClTTINGS

    )NADDITIONTHE%,%+42/,)&4CANASSUMEASWITCHFUNCTIONTHUSELIMINATINGANADDITIONALELECTRICALSWITCHINTHEAPPLICATION)NTHATCASETHEREISAPLASTICCAPATTHEPRESSURETUBEENDWHENTHEPISTONRODISCOMPRESSEDTHESWITCHINGCONTACTLIESONTHECOLLAROFTHECAP!SSOONAS THESWITCHINGCONTACT TOUCHES THEPISTON RODDURINGEXTENSION THEELECTRICCIRCUITISCLOSED4OSETTHESWITCHINGPOINTTHISVARIANTISAVAILABLEWITHANADJUSTABLESWITCHINGCONTACT FOREXAMPLEFOR TRUNK LIGHTINGAPPLICATIONS

    %,%+42/,)&4VARIANTS

    ,IGHTWEIGHT$ESIGN'AS3PRINGSWITH!LUMINUM0RESSURE4UBE

    4OMEETTHENEEDFORWEIGHTREDUCTIONTHROUGHLIGHTWEIGHTDESIGN3TABILUSALSOOFFERSGASSPRINGSWITHALUMINUMPRESSURETUBES$EPENDINGONTHEDIMENSIONSOFTHEPRESSURETUBEITISPOSSIBLETOACHIEVEAWEIGHTREDUCTIONOFUPTOCOMPAREDWITHCONVENTIONALGASSPRINGSWITHSTEELPRESSURETUBE4HANKSTOTHEIRBRIGHTPOLISHEDMETALSURFACEGASSPRINGSWITHANALUMINUMPRESSURETUBEFEATUREANATTRACTIVEHIGHTECHDESIGN

    'AS3PRINGSWITH3HRINK4UBE!SDESCRIBEDIN&IG THEGASSPRINGSHOULDBEINSTALLEDPREFERABLYWITHTHEPISTONRODPOINTINGDOWNTOENSURECONTINUOUSLUBRICATIONOFTHESEALWITHTHELUBRICANTACCUMULATINGINTHESEAL)FTHEGASSPRINGISINSTALLEDATASLOPETHEMAXIMUMSLOPEDEPENDSONTHEOILlLLAMOUNT)NTHATCASEPLEASENOTIFYUSOFTHEMOUNTINGORIENTATIONOFTHEGASSPRINGINYOURAPPLICATION)FTHEGASSPRINGPIVOTSAROUNDTHEHORIZONTALDURINGADJUSTMENTTHEMOUNTINGORIENTATIONOFTHEGASSPRINGDEPENDSONTHEMOSTFREQUENTAPPLICATIONENDPOSITION

    'ASSPRINGSWITHSHRINKTUBE

    4IPSON)NSTALLATIONAND5SE)NTHISAPPLICATIONCASETHEGASSPRINGSHOULDBEEQUIPPEDWITHANOILCHAMBERSYSTEM)FTHEPISTONRODPOINTSPERMANENTLYUPWARDINTHEAPPLICATIONA34!"),53GASSPRINGWITHADOUBLESEALSYSTEMSHALLBEUSED

    4RANSVERSEFORCESMAYRESULT INTHEPREMATUREWEAROFTHEGASSPRING4HEMOUNTINGANDACTUATIONOFTHEGASSPRINGSHOULDTHEREFOREBEFREEOFTRANSVERSEFORCES)FTHEGASSPRINGNEEDSTOMOVEINADIMENSIONALPLANEBALLJOINTS&IG CANBEUSEDASCONNECTINGELEMENTSTOPREVENTJAMMING

    4HEDESIGNOFTHESTANDARDGASSPRINGISCHOSENSOITCANBEUSEDINAMBIENTTEMPERATURESOF#TO#!BRIEFEXPOSURETOMAXHOURISPERMISSIBLE4HEGASSPRINGISMAINTENANCEFREE

    7HENMOUNTINGANDOPERATINGTHEGASSPRINGPLEASEMAKESURETHATTHEPISTONRODINPARTICULARISPROTECTEDFROMCONTAMINANTSPAINTANDDAMAGE7EHAVEPREPAREDADIRECTIVEFORTHEDISPOSALOFGASSPRINGSWHICHYOUCANORDER0LEASEALSOFOLLOWOURTIPSANDHINTSONTHECORRECTINSTALLATIONOFGASSPRINGSWHICHCANBEFOUNDINOUR#OMPREHENSIVE'AS3PRING#ATALOGASWELLASONTHE)NTERNETATWWWSTABILUSDE

  • 3+&

    4ECHNICALINFORMATION

    'AS3PRINGSFOR&ORCE3UPPLYAND6ARIABLE0OSITION,OCK

    )N ADDITION TO THE ABOVE MENTIONED FUNCTIONAL CHARACTERISTICS OF THE,)&4/-!4 GAS SPRING SUCH AS ADJUSTMENT AND DAMPING LOCKINGGASSPRINGSHAVETHEADDEDPROPERTYOFINlNITELYVARIABLEPOSITIONLOCKS4HISPROPERTYISACHIEVEDWITHASMALLSIZEDINTEGRATEDVALVESYSTEMTOMAINTAINTHECOMPACTDESIGNOFTHEGASSPRING4HEREARETWOBASICTYPESOFLOCKINGGASSPRINGS&IG PROVIDESANOVERVIEWANDSHOWSTHEMAJORAREASOFAPPLICATION

    /VERVIEWOFLOCKINGGASSPRINGSFROM34!"),53

    34!"),53'AS3PRING",/#/,)&4

    4HETHEORETICALPRINCIPLEOFTHE",/#/,)&4GASSPRINGWASEXPLAINEDIN#HAPTER4HESTRUCTUREANDSPECIALTYOFTHE",/#/,)&4GASSPRINGISSHOWNIN&IG )NTHEPISTONAVALVECANBEUSEDTOSEPARATETHETWOPRESSURECHAMBERSTOTHELEFTANDTHERIGHTOFTHEPISTONINAGASLEAKPROOFMANNER)FTHEVALVEISOPENEDBYTAPPETACTUATIONTHE",/#/,)&4 ACTS LIKE A ,)&4/-!4GAS SPRING ANDPROVIDESFORCESUPPLY

    4HEPISTONRODEXTENDSDAMPEDBYTHEGASSPRINGFORCEOR ITCANBECOMPRESSEDAGAINSTTHEFORCEOFTHEGASSPRING!SSOONASTHEVALVETAPPETISRELEASEDFROMTHEOUTSIDETHEVALVEPINCLOSESAUTOMATICALLYDUETOTHEGASPRESSUREACTINGONIT4HEGASEXCHANGEBETWEENPRESSURECHAMBERANDISINTERRUPTEDANDTHEPISTONORPISTONRODOFTHE",/#/,)&4GASSPRING IS LOCKED4HISWAY",/#/,)&4CANBELOCKED INANYSTROKEPOSITION&URTHERCRITERIA FOR LOCKINGGASSPRINGSWHICHNEEDTOBECUSTOMIZEDFORTHERESPECTIVEAPPLICATIONAREINADDITIONTOTHEEXTENSIONFORCE

    n!CTUATIONFORCEn!CTUATIONRANGEn$AMPINGn,OCKINGCHARACTERISTICSSPRINGLOCKINGORRIGID

    6ALVE!CTUATION2ANGEAND$AMPING)NADDITIONTOTHE",/#/,)&4SPRINGCHARACTERISTICCURVESHOWNIN&IG THEREISALSOAVALVEFORCECHARACTERISTICCURVE4HEVALVEACTUATIONFORCEDEPENDSONTHEDIAMETERSOFTHEPISTONRODTHEVALVEPINASWELLASTHElLLINGPRESSUREOFTHEGASSPRING3INCETHEDIAMETEROFTHEVALVEPINISTHESAMEDIFFERENTPISTONRODDIAMETERSRESULTINDIFFERENTACTUATIONFORCES&ORDEVICESWITHAMMPISTONRODDIAMETER

    THEYAREAPPROXIMATELYFORDEVICESWITHANMMPISTONRODDIAMETERTHEAREAPPROXOFTHEEXTENSIONFORCEOFTHEGASSPRING4HEACTUATIONRANGEDEPENDSONTHEDESIGNOFTHEVALVESYSTEMANDRANGESFROMTOMMSEE#HAPTER

    4HEEXTENSIONSPEEDOFTHEPISTONRODANDTHEDAMPINGCANBESPECIlEDINTHE",/#/,)&4WITHDIFFERENTDIAMETERSOFTHENOZZLEBOREINTHEPISTON4HE",/#/,)&4SHOWNIN&IG SHOULDBEINSTALLEDWITHTHEPISTONRODPOINTINGDOWNTOALLOWTHELUBRICANTINTHEDEVICETOCOLLECTINTHESEAL)FAGASSPRINGISEQUIPPEDWITHADOUBLESEALSYSTEMSIMILARTO&IG ITCANBEUSEDINANYMOUNTINGPOSITION

    ",/#/,)&4STRUCTUREVALVE FUNCTIONANDSPRINGCHARACTERISTICCURVE

    ",/#/,)&43TANDARD!CTUATION"ASICALLYTHEREARETWODIFFERENTVALVEDESIGNSTHESLIDINGVALVEANDTHESEATVALVE"OTHTYPESARESHOWNIN&IG

    ",/#/,)&4STANDARDANDSHORTACTUATION

    !

    'AS3PRINGSFOR&ORCE3UPPLYAND6ARIABLE0OSITION,OCK

  • 3+&

    3LIDINGVALVE

    4HESLIDINGVALVEISUSEDINDEVICESWITHSTANDARDACTUATION4HEACTUATIONRANGEFOROPENINGTHEVALVEISAMAXIMUMOFMM4HISDESIGNISRESISTANT TOPRESSUREANDTENSION THAT IS THEVALVEREMAINSCLOSEDEVENWHENSUBJECTEDTOEXTERNALPRESSUREANDTENSILE FORCESFROMTHEAPPLICATION

    3EATVALVE

    4HEADVANTAGEOFTHISTYPELIESINTHEVERYSHORTACTUATIONRANGEMAXMMFOROPENINGTHEVALVEWHICHRESPONDSIMMEDIATELYWHENACTUATEDAND RELEASESOR LOCKS THEGASSPRING,IKE THESEATVALVE THESLIDINGVALVEISPRESSURERESISTANT7HENSUBJECTEDTOHIGHTENSILEFORCESITOPENSBECAUSEDUETOTHESHAPEOFTHEVALVEPINTHEPRESSUREDAREAATTHEVALVESEATINCREASESRELATIVETOTHEVALVESHAFTAREA

    ,OCKING#HARACTERISTICSOF",/#/,)&4'AS3PRINGS

    $EPENDING ON THE APPLICATION RIGID OR SPRINGLOCKING CAN BE USED4HESE CHARACTERISTICS CAN BE ACHIEVED WITH THE RIGHT STRUCTURE OF",/#/,)&4GASSPRINGS7HENRIGIDLOCKINGISCHOSENTHELOCKINGDIRECTIONCANBECHOSENASWELL&URTHERMOREONEDIFFERENTIATESBETWEENPOSITIONDEPENDENTANDPOSITIONINDEPENDENTTYPES

    ",/#/,)&43PRINGLOCKING)NCERTAINAPPLICATIONSFOREXAMPLEINTHEBACKRESTADJUSTMENTOFSWIVELCHAIRSSPRINGYmEXIBLELOCKINGISDESIRABLE&IG SHOWSASPRINGLOCKING",/#/,)&4GASSPRING"ECAUSETHElLLINGGASCANBECOMPRESSEDASPRINGEFFECTRESULTSEVENWHENTHEVALVEISCLOSED

    &IRST THEPISTON RODCANBEPUSHED INEASILYBUTAFTERA FEWMINUTESITBECOMESHARDERTOCOMPRESSITAGAINSTTHEINCREASINGGASPRESSURE4HISPHYSICALEFFECTCANBECOMPAREDTOTHEFUNCTIONOFANAIRPUMPWITHTHEAIR PUMPVALVE CLOSED"ECAUSEOF THE lLLINGPRESSUREOF THEGASSPRINGTHESTROKEOFTHEGASSPRINGWITHACLOSEDVALVEISMUCHSMALLERTHANTHEAIRPUMPSTROKE4HERELATIVEDEmECTIONOFTHESPRINGUNDEREXTERNALLOADDEPENDSONTHEEXTENSIONFORCEOFTHEGASSPRINGTHEPISTONRODDIAMETERANDTHERESPECTIVEPOSITIONOFTHELOCKEDPISTONINTHEPRESSURETUBE)FTHEPISTONISNEARTHEPRESSURETUBECLOSEDENDTHEREWILLBEASMALLDEmECTIONINTHECOMPRESSEDDIRECTIONANDACOMPARATIVELYLARGEDEmECTIONINTHEEXTENSIONDIRECTION)FTHEPISTONISLOCKEDINTHEMEDIUMRANGEOFTHESTROKETHESPRINGCOMPRESSIONANDEXTENSIONDEmECTIONWILLBETHESAME

    ",/#/,)&4SPRINGLOCKINGWITHDOUBLESEAL

    ",/#/,)&42IGID,OCKING)NNUMEROUSAPPLICATIONS FOR EXAMPLE IN STEERING COLUMNADJUSTMENTORBACKRESTADJUSTMENTINCARSRIGIDLOCKINGISABSOLUTELYNECESSARY)NPRINCIPLERIGIDLOCKINGCOULDBEACHIEVEDBYlLLINGTHEPRESSURETUBEWITHOILTHATCANNOTBECOMPRESSED(OWEVERSINCETHEVOLUMEOFTHEPISTONRODTOBEPUSHEDINHASTOBEDISPLACEDTHEGASSPRINGCANNOTBElLLEDCOMPLETELYWITHOILACERTAINGASVOLUMEMUSTREMAIN

    )FTHE",/#/,)&4GASSPRINGISINSTALLEDWITHTHEPISTONRODPOINTINGDOWNOILWILLCOLLECTABOVETHEPISTONBECAUSEOFGRAVITY(OWEVERIFTHEPISTON RODCANNOTBEMOUNTEDPOINTINGDOWNASEPARATINGPISTONWILLENSUREFUNCTIONALPOSITIONINGOFTHEOIL4HERESULTINGTWOTYPESAREEXPLAINEDHEREAFTER

    ",/#/,)&40OSITIONINDEPENDENT2IGID,OCKING)FTHEAPPLICATIONISTOREMAINRIGIDLYLOCKEDWHENSUBJECTEDTOHIGHEXTERNALLOADSRIGIDLOCKING",/#/,)&4GASSPRINGSAREUSED)NTHISCASE",/#/,)&4ISEQUIPPEDWITHASEPARATINGPISTONTHATSEPARATESTHEGASANDOILCHAMBERS7HEREASTHEGASCHAMBERCOMPENSATESTHECOMPRESSEDPISTONRODVOLUMEANDTHEOILEXPANSIONCAUSEDBYTHEHEATTHEOILENABLESRIGIDLOCKING4HESEPARATINGPISTONCANBEPLACEDASSHOWNIN&IG EITHERONTHEPISTONRODORBETWEENPISTONANDPRESSURETUBEEND)NBOTHCASESTHEWORKINGCHAMBEROFTHEPISTONISlLLEDCOMPLETELYWITHOIL3INCEOILCANNOTBECOMPRESSEDVARIANT ) ISRIGID IN COMPRESSIONDIRECTION VARIANT )) IS RIGID INEXTENSIONDIRECTIONWHENTHEVALVEISCLOSED&IG

    ",/#/,)&4POSITIONINDEPENDENTRIGIDLOCKINGINEXTENSIONORCOMPRESSIONDIRECTION

  • 3+&

    4ECHNICALINFORMATION

    4HEMAXIMUMPERMISSIBLEOIL LOCKINGFORCEDEPENDSONTHEEXTENSIONFORCEOFTHEGASSPRINGANDTHEDEVICESTRENGTHTAKINGINTOCONSIDERATIONALLREQUIREDSAFETYFACTORS

    )F THEPISTON ISCHARGED IN THEDIRECTIONOF THEGASCHAMBERWHILE THEVALVEISCLOSEDVARIANT)INEXTENSIONDIRECTIONVARIANT))INCOMPRESSIONDIRECTION THEN THE",/#/,)&4 IS RIGIDLY LOCKED IN THISADJUSTMENTDIRECTIONUPTOTHERESPECTIVEGASLOCKINGFORCE(IGHEREXTERNALFORCESWILLRESULTINPISTONRODDEmECTIONBECAUSETHESEPARATINGPISTONISDISPLACEDDUETOTHEEXTERNALLOADANDTHEGASVOLUMEISCOMPRESSED4HEGASLOCKINGFORCEVARIESWITHEXTENSIONFORCE&ANDTHECHARGINGPRESSUREOFTHEGASSPRING4HEGASLOCKINGFORCEEXTENSIONFORCERATIOCORRESPONDSTOTHERATIOOFTHESEPARATINGPISTONPISTONRODCROSSSECTIONFORDESIGNTYPE)ITISAPPROXIMATELYFORDESIGNTYPE))APPROXIMATELY"OTHGASSPRING TYPESCANBEUSED INANYMOUNTINGORIENTATION7HILEVARIANT))DOESNOTREQUIREADDITIONALDESIGNELEMENTSFORTHISPURPOSEVARIANT)ISEQUIPPEDWITHTHE34!"),53DOUBLESEALSYSTEMALSOSHOWNIN&IG

    ",/#/,)&40OSITION$EPENDENT2IGID,OCKING)T IS POSSIBLE TO ACHIEVE THE FUNCTION OF THE VARIANT DESCRIBED IN&IG LESSEXPENSIVELYIFTHE",/#/,)&4CANBEMOUNTEDINTHEAPPLICATIONASSHOWNIN&IG (EREADDITIONALCONSTRUCTIONELEMENTSEGSEPARATINGPISTONCANBEOMITTED

    )FTHEGASSPRINGISMOUNTEDWITHTHEPISTONRODPOINTINGDOWNTHEOILINTHEDEVICECOLLECTSUNDERTHEPISTON4HISGASSPRINGCANTHENBELOCKEDRIGIDLYINEXTENSIONDIRECTIONASLONGASTHEPISTONISCOVEREDWITHOIL)FTHEPISTONRODISPOINTEDUPTHEGASSPRINGCANBELOCKEDRIGIDLYINCOMPRESSIONDIRECTION

    ",/#/,)&4 POSITIONSPECIlC RIGID LOCKING IN EXTENSION ORCOMPRESSIONDIRECTION

    )FTHEOPPOSITELOADISAPPLIEDTOTHE",/#/,)&4THEPISTONRODWILLDEmECTWHEN THEEXTERNAL LOADEXCEEDS THEGAS LOCKING FORCE4HEOILANDGAS LOCKING FORCESOF THESEVARIANTSCORRESPONDTO THOSEDEVICESWITHPOSITIONINDEPENDENTMOUNTINGORIENTATION"OTHVARIANTSCANALSOBEMOUNTEDATANINCLINE(OWEVERINTHISCASETHEADJUSTMENTRANGEWHERETHEPISTONISCOVEREDWITHOILISSMALLERTHANWHENTHEGASSPRINGISINSTALLEDVERTICALLY4HUS",/#/,)&4CANONLYBELOCKEDRIGIDLYINTHISLIMITEDSTROKERANGE)NADDITIONGASSPRINGISEQUIPPEDWITHADOUBLESEALSYSTEMFORLUBRICATIONOFTHEPISTONRODSEAL

    4IPSON)NSTALLATIONAND5SE4HE NOTES IN CHAPTER ON THE ,)&4/-!4 ALSO APPLY TO THE",/#/,)&4GASSPRING4HEDEVICEDESCRIPTIONCONTAINSINSTRUCTIONSONTHEINSTALLATIONPOSITIONDUETOTHEDIFFERENTLOCKINGFUNCTIONS

    )F OILLOCKING GAS SPRINGS SEE #HAPTER ARE USED IN CHANGINGAMBIENT TEMPERATURES CARE SHOULDBE TAKEN THAT THEGASSPRING CANMOVEFREELYONONEENDACCORDINGTOTHETHERMALEXPANSIONOFTHEOILEVENWHENTHEGASSPRINGISLOCKED!LOADONTHEGASSPRINGBEYONDTHELOCKINGFORCECANRESULTINDESTRUCTIONORMALFUNCTIONOFTHESPRING",/#/,)&4 IS LOCKED SAFELYWHEN THERE IS LITTLE PLAY BETWEEN THEOUTERACTUATIONSYSTEMANDTHEVALVEISLOCKED4OUNLOCKTHEDEVICETHEVALVETAPPETSHOULDBEPUSHEDINBYTHEAMOUNTINDICATEDONTHEGASSPRINGDRAWING4HEMAXIMUMVALVESTROKEDEPENDSONTHEDEVICEDESIGNANDISINDICATEDINTHEGASSPRINGDRAWING

    3TABILUS'AS3PRINGS34!"/-!4AND34!"/",/#

    34!"/-!4 AND 34!"/",/# ARE SPRINGLOCKING GAS SPRINGSUSED IN SWIVEL CHAIRS FOR SUSPENSION VARIABLE LOCKING AND DAMPEDHEIGHT ADJUSTMENT EVENUNDER ECCENTRIC LOADS&OR THIS PURPOSE THEPRESSURETUBEORTHESUPPORTTUBEOFTHESEDEVICESAREDIMENSIONEDTOACCOMMODATETHETRANSFEROFBENDINGMOMENTS&ORBOTHGASSPRINGSTHE LOCKING VALVE IS LOCATED ON THE PRESSURE TUBE END AS SHOWN IN&IG &OR THIS REASONAGUIDE TUBE ISNECESSARYWHICH FORMSANANNULARGAPBETWEEN ITSOUTERDIAMETERAND THEPRESSURE TUBE INNERDIAMETER4HEGUIDE TUBE IS LOCATEDBETWEEN THEVALVEBODYANDTHESEALANDGUIDEELEMENT4HISPRESSUREANDGUIDETUBECOMBINATIONOFAGASSPRINGISALSOCALLEDADOUBLETUBESYSTEM4HEPISTONOFTHE34!"/-!4OR34!"/",/#ISCLOSED

    7HEN THE VALVE IS OPEN AND THE PISTON ROD PUSHED IN THE GAS FROMPRESSURE CHAMBER CAN mOW THROUGH THE ANNULAR GAP INTO PRESSURECHAMBER7ITHTHEVALVECLOSEDTHESPRINGDEmECTIONANDTHESPRINGCHARACTERISTICSDURINGEXTENSIONANDCOMPRESSIONOFTHEPISTONRODCORRESPONDTOTHOSEOFTHESPRINGLOCKED",/#/,)&4S#HAP4HEEXTENSION FORCEOF THE34!"/-!4AND34!"/",/# IN THESWIVELCHAIRAPPLICATIONISUSUALLYBETWEEN.AND.4HEDAMPINGEFFECTDURINGCOMPRESSIONANDEXTENSIONISDETERMINEDBYTHECHOICEOFTHENOZZLEBOREDIAMETER

    4HEDIFFERENCEBETWEENTHESETWOLOCKINGGASSPRINGSLIESINTHEIRSTRUCTURE4HE34!"/-!4 ABSORBS THE LOADS RESULTING FROM THEWEIGHTON THE SEAT AND BENDINGMOMENTS CAUSED BY UNEVENWEIGHT DISTRIBUTIONON THESEATWITH THEPROPERLYDESIGNEDPRESSURE TUBE IN THE34!"/",/# THE FUNCTIONS OF iSUSPENSION DAMPING AND ADJUSTINGwAREPERFORMEDBYTHEINTERNALPRESSURETUBEANDTHEiTRANSMISSIONOFBENDINGMOMENTwBYTHEOUTERSUPPORTTUBE

    'AS3PRINGSFOR&ORCE3UPPLYAND6ARIABLE0OSITION,OCK

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    34!"/-!4AND34!"/",/#STUCTURES

    "ECAUSE OF THESE PROPERTIES THE34!"/-!4 IS CONSIDERED iSELFSUPPORTINGw AND THE 34!"/",/# IS iNONSELFSUPPORTINGw4HE COMBINATION OF 34!"/",/# WITH SUPPORT TUBE IS CALLEDi34!"/",/#4ELESCOPEw4HE 34!"/",/# CAN BE FASTENEDINTHESUPPORT TUBEWITHASCREWCAP4HISWAY ITCANEASILYBEREPLACEDWITHOTHEREXTENSIONFORCEVARIATIONSWITHOUTHAVINGTOCHANGETHESUPPORTTUBEWHICHISFASTENEDTOTHESEATCARRIER4HESTRENGTHOFTHETAPERATTHEENDOFTHEPRESSUREORSUPPORTTUBEWHICHISCLAMPEDINTOTHESEATCARRIEROFTHESWIVELCHAIRDETERMINESTHEBENDINGMOMENTTHATCANBETRANSMITTED34!"),53TAPERSAREDESIGNEDFORREVERSEDBENDINGMOMENTSOFUPTO.MACCTO$).AND4HEPERMISSIBLEREVERSEDBENDINGSTRESSFORTHERESPECTIVETAPERDIMENSIONSCANBEFOUNDINTHE34!"),53GASSPRINGPRODUCTLINECATALOG34!"/-!4AND34!"/",/#4ELESCOPEAREAVAILABLEWITHTHESAMEFORCESANDDIMENSIONSSO THAT THEYARE INTERCHANGEABLE4HEEXTENDED LENGTHOFGASSPRINGSINSTANDARDDEVICESISBETWEENMMANDMMWITHSTROKES RANGING FROMMM TOMM4HECONNECTIONGEOMETRYATTHEPISTONRODENDISDESIGNEDFORTHEDEVICESTOBEFASTENEDTOANOUTERTUBETOGETHERWITHANAXIALBALLBEARING&IG

    34!"/-!4UND34!"/",/#6ENTILSYSTEME

    4HEVALVEBODYOFTHE34!"/-!4AND34!"/",/#CANBEEQUIPPEDWITHASLIDINGORSEATVALVECOMPARE",/#/,)&4&IG 4HISWILLRESULTINDIFFERENTVALVESTROKESORACTUATIONRANGESANDFORCESFORRELEASINGTHEGASSPRING4HEFOLLOWINGTABLESHOWSALLACTUATIONVARIATIONS4ABLE

    6ALVEAND!CTUATION6ARIATIONS

    4HE STANDARD TAPPET HEIGHT &IG IS MM FOR THE34!"/",/#MMFORTHE34!"/-!4GASSPRINGS4OLIMITTHEPLAYBETWEENTHERELEASEMECHANISMINTHESEATCARRIERANDTHEACTUATORPINOFTHEGASSPRINGALLACTUATORVARIANTSAREAVAILABLEWITHANADJUSTABLETAPPETCANBESETWITHASCREW

    34!"/-!4AND34!"/",/##OLUMNS

    34!"/-!4 AND34!"/",/#4ELESCOPE AND AN OUTER TUBE ARECOMBINEDINTOASWIVELCHAIRCOLUMN&IG SHOWSAGASSPRINGCOLUMNWITHASTANDARDOUTERTUBEWITHTHEGASSPRINGSHOWNINTHECOMPRESSEDANDEXTENDEDPOSITION

    34!"/-!4AND34!"/",/#COLUMNSSTRUCTURESWITHSTANDARDOUTERTUBE

    !TAPERATTHEOUTERTUBEENDENSURESEASYMOUNTINGANDSAFEATTACHMENTOFTHEGASSPRINGCOLUMNSTOTHESTARBASEOFTHESWIVELCHAIR4HE34!"/-!4AND34!"/",/#4ELESCOPEARESECUREDTOTHEOUTERTUBEWITHASAFETYCLAMPATTHEPISTONRODEND4HEPRESSUREORSUPPORTTUBEENDISTHENPOINTEDUPFORFASTENINGTOTHERESPECTIVEOPPOSITETAPEROFTHESEATCARRIER4HEVALVETAPPETISEASILYACCESSIBLEFORTHERELEASESYSTEMSONTHESEATCARRIER )N THECOMPRESSIONDIRECTIONOF THEGASSPRINGTHEEXTERNALLOADISSUPPORTEDBYTHEAXIALBALLBEARINGSE

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    4ECHNICALINFORMATION

    CUREDTOTHEENDOFTHEPISTONRODWHICHSIMULTANEOUSLYENSURESASLIGHTROTATIONOFTHESEATCARRIER)NTHEONEPIECEVERSIONTHEBEARINGISACAPTIVEUNITTHUSCONTRIBUTINGTOEASYINSTALLATIONORREMOVALOFTHEGASSPRING4HERUBBERCUSHIONPOSITIONEDBETWEENTHEPRESSURETUBEENDANDTHEAXIALBEARINGISASOFTSTOPINTHELOWESTSEATPOSITIONWHENTHEGASSPRINGISCOMPRESSEDANDCANNOTDEmECTANYFURTHER&OROPTIMIZEDGUIDANCEWHENADJUSTINGANDSWIVELINGTHEGASSPRINGORTHESEATCARRIERTHEOUTERTUBEHASAlTTEDGUIDEBUSHING4HELENGTHOFTHISBUSHINGISDESIGNEDTOTRANSMITTHEBENDINGMOMENTSTHATARELEDINTOTHEPRESSUREORSUPPORTTUBESAFELYTOTHEOUTERTUBE4HESTROKEANDEXTENDEDLENGTHOFTHEGASSPRINGASWELLASTHELENGTHOFTHEOUTERTUBEMUSTTHEREFOREBEMATCHED4HEPISTONRODOFTHEGASSPRINGISTHENFREEFROMTRANSVERSEFORCESANDBENDINGMOMENTS4HEREQUIREDGUIDEDLENGTHOFTHEGASSPRINGWHENEXTENDED&IG DEPENDSONTHEGASSPRINGSTROKE4HEEFFECTIVELENGTHSHOULDBEATLEASTMM

    !DDITIONALCOLUMNVERSIONSAREAVAILABLE TO INCREASE THEEASEOFGASSPRINGADJUSTMENTANDBOUNCEPROPERTIESOFTHESWIVELCHAIRTHEYAREDESCRIBEDINTHEFOLLOWINGSECTIONS

    34!"),53/UTER4UBEWITH"OTTOM3PRING3PECIAL SEATING COMFORT CAN BE ACHIEVED IF IN ADDITION TO A RUBBERCUSHIONACOILCOMPRESSIONSPRINGSHOWNIN&IG ISINTEGRATEDINTHEOUTERTUBE4HISSPRINGISCONNECTEDTOTHEPISTONRODOFTHEGASSPRINGVIAmEXIBLECOUPLING

    34!"),53SWIVELCHAIRCOLUMNWITHBOTTOMSPRING

    )FTHEPISTONRODISCOMPRESSEDANDTHEGASSPRINGCANNOTDEmECTFURTHER A COIL COMPRESSION SPRING PROVIDES AN ADDITIONAL BOTTOM SPRINGFUNCTION)NALLOTHERSTROKEPOSITIONSOFTHEGASSPRINGTHEGASSPRINGANDTHECOILCOMPRESSIONSPRINGACTTOGETHERWHICHENSURESPLEASANTRESILIENCEWHENTHEGASSPRING IS LOCKED!SANALTERNATIVETO THECOILSPRINGSPECIALENDPOSITIONBUFFERSCANBEUSEDWHICHALSOOFFERMORECOMFORTINTHELOWESTSEATPOSITION

    34!"),534ELESCOPE/UTER4UBE4HE HEIGHT ADJUSTMENT OF 34!"/-!4 AND 34!"/",/# GASSPRINGSISUSUALLYLIMITEDBYTHEREQUIREDGUIDEDLENGTHINTHEOUTERTUBE!NINCREASEDADJUSTMENTRANGEAUTOMATICALLYRESULTSINALONGEROUTERTUBETHUSCAUSINGTHELOWESTSEATPOSITIONTOBEHIGHER

    4HE 34!"),53 4ELESCOPE /UTER 4UBE SOLVES THIS PROBLEM &OR THISPURPOSEA TELESCOPING TUBE IS INTEGRATED IN THEOUTER TUBE7HILE THEGASSPRINGISGUIDEDINTHETELESCOPETUBETHETELESCOPETUBEISGUIDEDINTHEOUTERTUBE&IG)TEXTENDSASSOONASTHEPINONTHEGASSPRINGREACHESTHEGUIDEBUSHINGDURINGADJUSTMENTOFTHEGASSPRING

    34!"),53SWIVELCHAIRCOLUMNWITHSTANDARDANDTELESCOPEOUTERTUBESTRUCTURE

    -ULTIFUNCTION#OLUMN)T IS NOT ALWAYSDESIRABLE THAT SWIVEL CHAIRS REMAINAT THE SET HEIGHTBUTRETURNTOACERTAINPOSITIONUPONREMOVALOF THELOAD4HE-5,4)&5.#4)/.#/,5-.NOTONLYRETURNSTOTHEHIGHESTSEATPOSITIONBUTALSOSWIVELSBACK TO THESTARTINGPOSITION4HISENSURESANAPPEARANCEOFiNEATNESSwATALLTIMES.ATURALLYALLOTHERFUNCTIONSOFVARIABLESEATADJUSTMENTARESTILLAVAILABLEINTHE-5,4)&5.#4)/.COLUMN4HE-5,4)&5.#4)/.#/,5-.ISESPECIALLYSUITEDFORCONFERENCEROOMCHAIRSANDSPECIALCHAIRAPPLICATIONSFOREXAMPLEINTHE'ERMAN0ARLIAMENTIN"ERLINORTHE%UROPEAN0ARLIAMENTIN3TRASBOURG

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    -ULTIFUNCTION#OLUMN.%7

    .ONTWISTINGCOLUMN

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    #OLUMNWITH!DDITIONAL3TOP&UNCTION

    4HETELESCOPECOLUMNWITHSTROKECONTROLLEDSTOPFUNCTIONPROTECTSSTOOLSANDTASKCHAIRSFORSTANDINGSEATEDWORKSTATIONSINASPECIlCRANGEAGAINSTACCIDENTALROLLINGAWAY!BOVEADElNEDACTUATIONPOINTWITHINTHESTROKERANGEARUBBERSTOPPERREBOUNDSOUTOFTHECOLUMNWHENALOADISAPPLIEDBYTHEUSEROFTHECHAIRTHUSPREVENTINGTHECHAIRFROMROLLINGAWAY"ELOWTHISACTUATIONPOINTTHESTOPPERREMAINSINANDTHECHAIRCANBEUSEDANDADJUSTEDLIKEANORMALSWIVELCHAIR

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    4IPSON)NSTALLATIONAND5SE

    4HEMOUNTINGORIENTATIONOFTHE34!"/-!4AND34!"/",/#4ELESCOPE ISDETERMINEDBY THE RESPECTIVEENDlTTINGS4HE TAPERAT THEPRESSUREORSUPPORT TUBEEND ISATTACHED TO THEOPPOSITE TAPEROF THESEATCARRIER4HEOUTERTUBETAPERISINSTALLEDINTHERESPECTIVEOPPOSITETAPEROFTHESTARBASE4HEPISTONRODOFTHEGASSPRINGSHOULDALWAYSPOINT DOWN0LEASE FOLLOW THE STRENGTH CLASSES AND TAPER DIMENSIONSGIVENINTHE34!"),53'AS3PRING#ATALOGASWELLASTHERESPECTIVESTANDARDSEG$).FOROFlCESWIVELCHAIRSIN'ERMANY4OPROTECTTHEPISTONRODFROMTRANSVERSEFORCEANDBENDINGMOMENTLOADSORJAMMINGTHEPRESSURETUBEOFTHEGASSPRINGSHALLBEPROPERLYGUIDEDINTHEGUIDEBUSHINGOFTHEOUTERTUBE4HEPISTONRODENDISATTACHEDTOTHEOUTERTUBEBOTTOMALLOWINGFORSOMERADIALPLAY7HENUSING34!"),53GASSPRINGCOLUMNSBOTHAREAUTOMATICALLYGUARANTEED

    7HENMOUNTING THEMULTIPARTAXIALBEARINGS THEASSEMBLYSEQUENCEACCORDINGTOTHEDRAWINGSHALLBEFOLLOWED4HESWIVELCHAIRCANTHENBESWIVELEDNOISELESSLYANDCOMFORTABLY&ORFURTHERAPPLICATIONHINTSSEE#HAP

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  • 3+&

    4ECHNICALINFORMATION

    ARESCREWEDONTOTHEPISTONRODANDSECUREDWITHANUT4HEYALSOCONTAINTHEPISTONRODSIDECONNECTIONTOTHEAPPLICATIONWHICHALLOWSFORACOMPACTDESIGNANDEASYINSTALLATIONOFTHEGASSPRING4HE"OWDENCABLEISINSTALLEDBYPLACINGTHESLEEVEONTHEJIBOFTHEACTUATIONHEAD4HEDESIGNOF THERELEASEHEADOF THE34!"/",/#34!"/-!4GASSPRINGISDESIGNEDTOINCLUDETHERELEASEHEADINTHEPRESSURETUBETA

    PER)TCANBEREMOVEDANYTIMEBYRELEASINGTHEFASTENINGCLAMPS4HELEVERAND"OWDENCABLELENGTHSDEPENDONTHERESPECTIVEAPPLICATION$IMENSIONSSTRENGTHSAND INSTALLATION TIPS FOR THEACTUATIONSYSTEMSAREINCLUDEDINTHE34!"),53SPECIlCATIONS$EPENDINGONTHEINSTALLATIONSITUATIONRADIALGUIDANCEOFTHE"OWDENCABLEMIGHTBEMOREFAVORABLE4HEREISASPECIALCONlGURATIONAVAILABLEFORTHISASWELL

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  • 3+&

    34!"),53LOCKINGELEMENTSWITHOUTEXTENSIONFORCE(9$2/",/#

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