Designation:F851−87(Reapproved2013)StandardTestMethodforSelf-RisingSeatMechanisms1ThisstandardisissuedunderthefixeddesignationF851;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodevaluatestheperformanceofself-risingorautomatic-liftingseatmechanismsofchairsinplacesofassembly.1.2Thistestmethodaddressesonlytheraisingoftheseat.Itdoesnotaddresstheloadthatmaybeplacedonthatseat.CommitteeF15isconsideringastandardaddressingthisload.1.3Thevaluesasstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesinparenthesesareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SummaryofTestMethod2.1Theprincipleofthetestmethodistotestthereliabilityoftheseat-liftingmechanism.2.2Thistestmethodconsistsofusinghardrubberrollersattachedduallytotheendofanactuatingbartolowertheseat.Theseatisthenreleasedandallowedtoliftautomaticallytothe“at-rest”or“raised”position.Thetestmethodrequirestheseattobecycledataspecifiedrate,andallowsforthenumberofcyclescompleted,withoutfailure,tobemeasured.2.3The“at-rest”positionforanauditoriumchairisthe“raised”position.Theseatisloweredtoallowtheoccupanttobeseated.Whenreleased,theseatisautomaticallyreturnedtothe“raised”positionbyuseofaspringreturnmechanismorcounter-weightforgravitylift(seeFigs.1and2).3.SignificanceandUse3.1Thistestmethodprovidesthecriteriaforapractical,reproducibletestforassuringtheproperlife-cycleofself-risingorautomatic-liftingseatmechanismsofchairs.3.2Thistestmethodshouldbeconsideredsuitableforthetestingrequiredfordesignpurposes,manufacturingcontrol,serviceevaluation,specificationaccep...
