HumanPoweredVehicleChallenge

(HPVC)SafetyCheckIllustrationsofSafeandUnsafeelements

Published5/25/20161

Outline

• RolloverProtectionSystem(RPS)• Harness/seatbelt• SteeringSystem• BrakingSystem• SharpEdges,protrusions,pinchpoints• Screws• Weldedjoints

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RolloverProtectionSystem(RPS)• Mustclearthehelmetoftallestrider• Mustpreventriderfromcontactwithground• Protectiononsidesandtopofvehicle

SatisfactoryCompositeRPSà Side&topprotection

SatisfactoryRPSà Clearshelmetbyseveralinches

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UnsatisfactoryRPSà Helmettouchesground

SatisfactoryRPSà NosidecontactNote:Inanaccident,flailing

legsandarmscouldstillcontacttheground

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UnsatisfactoryRPSà InadequateProtection

RPSàSinglePost

UnsatisfactoryRPSà InsufficientRPSheight

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Harness/SeatBeltSatisfactoryshoulder strapàWidthandattachment

Unsatisfactorylapbeltà Toonarrowà Should be46mmwide

Goodharnesssystem

Goodattachmentmethodà Boltedtoframe

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SteeringSystem• Nolooseness

• Allcomponentsstructurallysoundandsecurelyattached

• TierodswithadequatestiffnessUnsatisfactorysteeringarmweldà Safetycriticalcomponentà Reweld required topass

Unsatisfactoryhandlebarà Madeofconduità Insufficient strength

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TieRodsTierodsshouldbestrongandstiffenoughtopreventbucklingTubes,particularlylargerdiametertubes,workwell

GoodTieRoddesignà Tubularwithadequate

diameterPoorTieRoddesignàLong, small-diameterrodàPronetobuckling

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BrakingSystem

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Unsatisfactoryadjustmentà Levertoucheshandlebar

UnsatisfactoryàNofrontbrakeàFrontbrakeprovidesmuchmorebrakingforcethanrearbrake Satisfactoryadjustment

à Thumbfitsbetweenleverandhandlebar

OpenTubeEnds• Opentubeendsmustbeclosed• Handlebarplugsmustbeinstalled• Plasticormetalplusworkwell

Unsatisfactoryà Opentubeswillfailsafety

GoodsolutionàHandlebarendplugàPlastictubeplug

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OpenTubeEndsMarginallySatisfactoryà Tapeopenendssecurely

AcceptableàSecurelytapefoamplugàSecurelytapetennisballorsimilaràEnsuresafetyaccommodationsareobvious tospeedupyoursafetycheck

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Screws Suspension screwmissingnut

Nuts/screwsmustbeproperlysecured.àPropertorqueàThreadlockingcompoundàLockingdeviceorlockwire

MarginallyAcceptableàTubingcoversscrewà Betterthantape

UnsatisfactoryàMorethan3threadsexposed

Bestà Lessthan3threadsexposed

AcceptableàSecondnut12

SharpEdges

Betterà Cornersrounded

Unsatisfactoryà Sharpedgesjustinfront

ofseat

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Poorpenetration,onesideweld

Welds

Unsatisfactoryweldà Poorpenetrationà Visiblegaps

Unsatisfactoryweldà Poorpenetrationà Weldononesideonlyà Seat/Harnessattachmentissafety

criticalcomponent!

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ContactInformation

QuestionsaboutsafetycanbedirectedtotheHPVCforum:https://groups.google.com/forum/#!categories/asme-hpvc/design-and-safety

Oremailcanbesenttohpvcasme@gmail.com

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ThankstoMarkArchibald

MarkArchibaldcreatedthissetofslidesafterservingasthesafetyjudgeattheHPVCEast2016.MarkisaprofessoratGroveCityCollegeandisthepastChiefJudgeandpastChairoftheHPVC.Heisawealthofknowledgeabouthumanpoweredvehiclesandwegreatlyappreciatehiscontributions.

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