Muelles Gas SKF
Transcript of Muelles Gas SKF
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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
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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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$USTANDCONTAMINANTDEPOSITSONTHEPISTONRODCANHAVEANEGATIVEIMPACTON THE LIFEOFGASSPRINGS )NENVIRONMENTALCONDITIONS THATARELESS THANOPTIMALAPROTECTIVE TUBEOFFERSPROTECTIONAGAINSTCONTAMINANTSDUSTMOISTUREORPOSSIBLEMECHANICALIMPACTONTHEPISTONROD)NTHATCASEAMOUNTINGORIENTATIONSHOULDBESELECTEDTHATPREVENTSTHEPROTECTIVETUBEFROMGETTINGlLLEDWITHCONTAMINANTSORMOISTURE)NORDERTOIMPROVETHEFUNCTIONALSAFETYANDCORROSIONRESISTANCEEVENFURTHERADDITIONALPROTECTIVECAPSMADEOFPLASTICPROTECTTHECRIMPINGANDBEADINGAREAOFTHEGASSPRINGAGAINSTMOISTUREDUSTANDCONTAMINANTS
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4ECHNICALINFORMATION
,)&4/-!4SEALANDGUIDEELEMENT
,)&4/-!4%ND&ITTINGS
!LARGEVARIETYOFENDlTTINGSALLOWSFORFASTANDEASYINSTALLATIONOFTHEGASSPRINGINTHEAPPLICATION&IG SHOWSASELECTIONOF3TABILUS,)&4/-!4GASSPRINGENDlTTINGSFORMOUNTINGONTHEPISTONRODSIDEORONTHEPRESSURETUBESIDE
,)&4/-!4'AS3PRINGWITH(YDRAULICAND$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
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5NLIKEHYDRAULICDAMPINGTHE,)&4/-!4WITHHYDRAULICDAMPINGCANBEMOUNTEDINANYORIENTATION4HEEXTENSIONSPEEDOFTHEGASSPRINGISCONTROLLEDBYALONGITUDINALGROOVEINSIDETHEPRESSURETUBE)NTHISCASETHEPISTONRODDOESNOTHAVEAmOWCHANNELSOTHATTHEGASmOWSTHROUGHTHEFREEGROOVECROSSSECTIONWHENTHEPISTONRODISADJUSTED"YVARYINGTHEGROOVEGEOMETRYITISPOSSIBLETOADJUSTTHEMOTIONSPEEDOFTHEPISTONRODOVERTHEENTIRESTROKETHUSOPTIMIZINGITTOTHERESPECTIVEAPPLICATION&IGBSHOWSANEXAMPLEOFTHEEXTENSIONSPEEDBEHAVIOROFAGASSPRINGWITHAGROOVECROSSSECTIONTHATTAPERSOFFTOWARDTHEENDPOSITIONOF THESTROKE4HEMOTIONPROCEEDSATACONTINUOUSLYDECREASINGEXTENSIONSPEEDUNTILTHEPISTONRODCOMESALMOSTTOAHALTTHUSENSURINGASMOOTHSTOPOFTHEAPPLICATION7HENUSINGTHISTECHNOLOGYDAMPINGINTHECOMPRESSIONDIRECTIONISALSOPOSSIBLETHISCANBEUSEFUL INAPPLICATIONSUCHASCARHOODS,IKEWISEDIFFERENTGROOVEGEOMETRIESAREPOSSIBLEFOREXAMPLEFORDAMPEDAPPROACHINGOFINTERIMPOSITIONS
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3OME APPLICATIONS DO NOT REQUIRE A LINEAR BUT A SPECIALLY ADJUSTEDSTROKECONTROLLEDFORCESUPPLY3UCH ISOFTENTHECASE INENDPOSITIONSOFAPPLICATIONSTHATREQUIREDISPROPORTIONATELYHIGHORLOWSPRINGFORCESRELATIVETOTHEMAINADJUSTMENTRANGE4HE,)&4/-!4GASSPRING ISPARTICULARLY SUITED TO THIS SINCE ITS SPRINGCHARACTERISTIC CURVECANBEEASILYCUSTOMIZEDTOTHEAPPLICATIONBYSIMPLEADDITIONOFCOILSPRINGS
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!COILSPRINGBETWEENPISTONANDPRESSURETUBEBOTTOMCREATESAPROGRESSIVESPRINGCHARACTERISTICCURVEASSHOWNIN&IG 4HEGASSPRINGISSUPPORTEDBYTHEFORCEOFTHECOILSPRINGWHICHINCREASESTHEGAS SPRING FORCEWHEN THE PISTON ROD IS COMPRESSED4HIS SOLUTION ISSUITABLEINCASESWHEREAPARTICULARLYHIGHEXTENSIONFORCEINTHECOMPRESSEDPOSITIONOFTHEGASSPRINGISNEEDED
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4ECHNICALINFORMATION
mAPSASWELLASALOCKINGELEMENTAGAINSTUNINTENTIONALCLOSINGEGUNDERAHEAVYWINDORSNOWLOAD)FMORETHANONEGASSPRINGISUSEDIN AN APPLICATION IT IS USUALLY SUFlCIENT TO EQUIP JUST ONE OF THE GASSPRINGSWITHTHEMECHANICALSTOPELEMENT
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'AS3PRINGSWITH3HRINK4UBE!SDESCRIBEDIN&IG THEGASSPRINGSHOULDBEINSTALLEDPREFERABLYWITHTHEPISTONRODPOINTINGDOWNTOENSURECONTINUOUSLUBRICATIONOFTHESEALWITHTHELUBRICANTACCUMULATINGINTHESEAL)FTHEGASSPRINGISINSTALLEDATASLOPETHEMAXIMUMSLOPEDEPENDSONTHEOILlLLAMOUNT)NTHATCASEPLEASENOTIFYUSOFTHEMOUNTINGORIENTATIONOFTHEGASSPRINGINYOURAPPLICATION)FTHEGASSPRINGPIVOTSAROUNDTHEHORIZONTALDURINGADJUSTMENTTHEMOUNTINGORIENTATIONOFTHEGASSPRINGDEPENDSONTHEMOSTFREQUENTAPPLICATIONENDPOSITION
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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
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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
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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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.ONTWISTINGCOLUMN
)NCERTAINAPPLICATIONSSWIVELCHAIRSSHOULDNOTTURNEITHERDUETOTHESITUATIONSORFACILITIESTHEYAREUSEDIN4HISCANBEENSUREDWITHNONTWISTINGCOLUMNS!TTHESAMETIMEALLADVANTAGESANDTHEFULLCOMFORTOFTHEVARIABLELOCKINGHEIGHTADJUSTMENTFUNCTIONSOFTHE34!"/-!4AND34!"/",/#COLUMNSAREAVAILABLE
#OLUMNWITH!DDITIONAL3TOP&UNCTION
4HETELESCOPECOLUMNWITHSTROKECONTROLLEDSTOPFUNCTIONPROTECTSSTOOLSANDTASKCHAIRSFORSTANDINGSEATEDWORKSTATIONSINASPECIlCRANGEAGAINSTACCIDENTALROLLINGAWAY!BOVEADElNEDACTUATIONPOINTWITHINTHESTROKERANGEARUBBERSTOPPERREBOUNDSOUTOFTHECOLUMNWHENALOADISAPPLIEDBYTHEUSEROFTHECHAIRTHUSPREVENTINGTHECHAIRFROMROLLINGAWAY"ELOWTHISACTUATIONPOINTTHESTOPPERREMAINSINANDTHECHAIRCANBEUSEDANDADJUSTEDLIKEANORMALSWIVELCHAIR
#OLUMNWITHADDITIONALSTOPFUNCTION.%7
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
34!"),53!CTUATION3YSTEMSFOR,OCKING'AS3PRINGS
4HEACTUATIONSYSTEMCONSISTSOFANACTUATIONELEMENTFOREXAMPLEONTHESEATCARRIERTHERELEASEHEADONTHEGASSPRINGANDnFORiREMOTECONTROLwnA"OWDENCABLEAS THE TRANSMISSIONELEMENTBETWEENACTUATIONELEMENTANDRELEASEHEAD4HECHOICEOFACTUATIONELEMENT ISUSUALLY DETERMINED BY THE FREE INSTALLATION SPACE AND THE CUSTOMERSWISHESREGARDINGFORMANDFUNCTION
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4HERELEASEHEADORVALVETAPPETOFTHE",/#/,)&4GASSPRINGCANBEOPERATEDBYRELEASELEVEROR"OWDENCABLE"OTHRELEASEHEADTYPES
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4ECHNICALINFORMATION
ARESCREWEDONTOTHEPISTONRODANDSECUREDWITHANUT4HEYALSOCONTAINTHEPISTONRODSIDECONNECTIONTOTHEAPPLICATIONWHICHALLOWSFORACOMPACTDESIGNANDEASYINSTALLATIONOFTHEGASSPRING4HE"OWDENCABLEISINSTALLEDBYPLACINGTHESLEEVEONTHEJIBOFTHEACTUATIONHEAD4HEDESIGNOF THERELEASEHEADOF THE34!"/",/#34!"/-!4GASSPRINGISDESIGNEDTOINCLUDETHERELEASEHEADINTHEPRESSURETUBETA
PER)TCANBEREMOVEDANYTIMEBYRELEASINGTHEFASTENINGCLAMPS4HELEVERAND"OWDENCABLELENGTHSDEPENDONTHERESPECTIVEAPPLICATION$IMENSIONSSTRENGTHSAND INSTALLATION TIPS FOR THEACTUATIONSYSTEMSAREINCLUDEDINTHE34!"),53SPECIlCATIONS$EPENDINGONTHEINSTALLATIONSITUATIONRADIALGUIDANCEOFTHE"OWDENCABLEMIGHTBEMOREFAVORABLE4HEREISASPECIALCONlGURATIONAVAILABLEFORTHISASWELL
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34!"),53LOCKINGELEMENTSWITHOUTEXTENSIONFORCE(9$2/",/#
$AMPEDADJUSTMENTANDINlNITELYVARIABLELOCKINGARETHECHARACTERISTIC FUNCTIONALPROPERTIESOF THE(9$2/",/#4HISCONSTRUCTIONTYPEDOESNOTHAVEANEXTENSIONFORCEANDISTHUSMOSTSUITABLEFORAPPLICATIONSTHATDONOTREQUIREANYFORCESUPPORTBUTDAMPINGANDINlNITELYVARIABLELOCKING!PPLICATIONEXAMPLESAREFOUNDINTHEAUTOMOBILEINDUSTRYFORTHELENGTHADJUSTMENTOFTHESTEERINGCOLUMNANDINFURNITUREASANADJUSTMENTELEMENTFORBACKRESTSASWELLASFORSEATINCLINATIONADJUSTMENT &IG SHOWSTHESTRUCTUREOF THE(9$2/",/#4HE(9$2/",/# DIFFERS FROM THE ",/#/,)&4 IN ITS INNER STRUCTURE4HEPISTONOFTHEDEVICEISARRANGEDINSUCHAWAYTHATINADDITIONTOAPISTONRODPOINTINGOUTWARDSITHASROOMFORAGIMBALlXEDCOMPENSATIONPISTONROD4HEUSEOFACOMPENSATIONPISTONRODRESULTSINTHECOMPONENTSOFTHEINTERNALPRESSUREOFTHEDEVICEBEINGMUTUALLYELIMINATEDINTHEAXIALDIRECTION4HEPISTONRODTHUSHASNORESULTANTOUTPUTFORCE4OADJUSTTHE(9$2/",/#ITISONLYNECESSARYTOOVERCOMETHEFRICTIONFORCEOFTHESEALELEMENTSANDmOWRESISTANCEOFTHEPISTONNOZZLESASSHOWNINTHECHARACTERISTICCURVEIN&IG
(9$2/",/#STRUCTUREANDCHARACTERISTIC
4HE FRICTION IS SLIGHTLY GREATER IN THIS CONSTRUCTION TYPE THAN IN THE",/#/,)&4BECAUSEOFTHEADDITIONALSEALREQUIREDFORTHECOMPENSATIONPISTONROD4HEDAMPINGOFTHEADJUSTMENTMOTIONMAYBEDETERMINEDBYVARYINGTHENOZZLEDIAMETERASISTHECASEFORTHE",/#/,)&44HESEPARATIONPISTONSEPARATESTHEPRESSURELESSCOMPENSATIONCHAMBERFROMTHEPISTONWORKCHAMBER4HECOMPENSATIONCHAMBERONLYSERVESTOACCEPTANDPROTECTTHECOMPENSATIONPISTONRODWHENADJUSTINGTHEDEVICEINTHECOMPRESSIONDIRECTION4OCOMPENSATEFORTHECHANGEINOILVOLUMEDURINGTEMPERATURECHANGESTHEWORKCHAMBERCONTAINSAPRESSURISEDGASPOCKET7HENTHEVALVEISCLOSEDTHE(9$2/",/#CONSEQUENTLY BEHAVES SIMILARLY TO THE GASLOCKED ",/#/,)&4&IG (OWEVERTHESPRINGEFFECTINTHE(9$2/",/#ISCONSIDERABLYLESSBECAUSEOFTHERELATIVELYSMALLGASPOCKETSOTHATITLOCKSRIGIDLYINBOTHADJUSTMENTDIRECTIONS4HEVALVERELEASEFORCEISAPPROX.THEVALVESTROKEISMM&IG SHOWSANOTHERCONSTRUCTIONOF THE(9$2/",/#4HE CONSTRUCTIONSDIFFER IN THE SEPARATIONPISTONSUPPORT7HEREAS THESEPARATIONPISTONOF THE(9$2/",/#SHOWN IN &IG IS POSITIONEDAGAINST THE RADIAL GROOVE THE COILSPRINGSHOWN IN &IG SUPPORTS THESEPARATIONPISTON4HE TEMPERATUREDEPENDENTOILEXPANSIONISCOMPENSATEDBYTHECOILSPRINGAGASPOCKETINTHEWORKCHAMBERISNOTNECESSARY4HISISWHYTHEDEVICEISRIGIDINBOTHADJUSTMENTDIRECTIONSWHENTHEVALVEISCLOSED)TISONLYWHENTHEEXTERNALLOADEXCEEDSTHEINITIALTENSIONFORCEOFTHECOILSPRINGTHATTHEPISTONRODCANBECOMPRESSED/NTHISDEVICEVARIANTTHEVALVERELEASEDFORCEISMAINLYDETERMINEDBYTHEFORCEOFTHEVALVESPRING)TISAPPROX.ANDTHEVALVESTROKEMM
(9$2/",/#WITHTHEINITIALTENSIONONTHECOILSPRINGOFTHESEPARATIONPISTON
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4ECHNICALINFORMATION
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