Personal Mobility LiftPersonal Mobility Lift

2006-2007 Capstone2006-2007 CapstoneTeam Members:Team Members:

Jim FolgateJim FolgateBill BeersBill Beers

Ryan PeltonRyan PeltonDavid ZuercherDavid Zuercher

IntroductionIntroduction

PDSPDS

Concept SelectionConcept Selection

Design SelectionsDesign Selections

AnalysisAnalysis

FabricationFabrication

VerificationVerification

AdditionsAdditions

Product Design Product Design SpecificationsSpecifications

Mission StatementMission Statement: : This project requires the team to design and build a This project requires the team to design and build a small functional device that will lift a person from the small functional device that will lift a person from the floor (2”) to the height of a wheelchair or walker (24”-floor (2”) to the height of a wheelchair or walker (24”-30”.) The device will be firmly mounted to a wall, and 30”.) The device will be firmly mounted to a wall, and be powered by the person being lifted. This product be powered by the person being lifted. This product will be designed for anyone requiring the additional will be designed for anyone requiring the additional

mobility afforded by such a device.mobility afforded by such a device.

High Priority RequirementsHigh Priority Requirements

Lifting RangeLifting RangeLowers Easily and Lowers Easily and SafelySafelyHuman PoweredHuman PoweredSecure MountingSecure MountingErgonomic/ComfortErgonomic/ComfortMaintenance FreeMaintenance FreeLong Wearing FinishLong Wearing FinishCostCost

Concept SelectionConcept Selection

Weight Hand winchHydraulicScissor Ratchet

Performance 3 2 5 2

Ergonomics 2 3 3 3

Quality/Reliability 3 4 4 5

Safety 3 3 4 3

Aesthetics 1 2 4 4

Cost 2 4 2 3

Totals 43 53 46

Detail Design DecisionsDetail Design Decisions

Bottle JackBottle Jack– Inexpensive $10Inexpensive $10– FunctionalFunctional– Lifting PowerLifting Power– Built in featuresBuilt in features

PumpPump

Release valveRelease valve

Scissor LiftScissor Lift– Number of LinkagesNumber of Linkages– LengthsLengths– Beam analysisBeam analysis

FastenersFasteners– Diameters selected for Diameters selected for

strengthstrength– Lengths selected Lengths selected

based on design based on design geometrygeometry

Bushing BlocksBushing Blocks– Bronze BushingBronze Bushing– Steel mounting Steel mounting

Guide RodsGuide Rods– Solid Steel ShaftsSolid Steel Shafts– Precision machinedPrecision machined

FrameFrame– 3/16” A36 Steel3/16” A36 Steel– Doubles as the housing for Doubles as the housing for

the lifting device, and a the lifting device, and a supportive back for the supportive back for the chairchair

Pump HandlePump Handle– Steel pipe with bungee Steel pipe with bungee

cordcord

Powder CoatPowder Coat

AnalysisAnalysis

FEA analysis of frameFEA analysis of frame

Beam Analysis for the Beam Analysis for the Scissor membersScissor members

Lateral Forces on the Lateral Forces on the Guide rodsGuide rods

Fastener Shearing Fastener Shearing AnalysisAnalysis

Fabrication at Warn IndustriesFabrication at Warn Industries

AssemblyAssembly

VerificationVerification

Lifting RangeLifting Range– Lifts from 1/2” to 28”Lifts from 1/2” to 28”

Human PoweredHuman Powered– CheckCheck

Secure MountingSecure Mounting– Mounted to wall studs Mounted to wall studs

and flooringand flooring

ErgonomicsErgonomics– Smooth pumping actionSmooth pumping action– Pillow-top seat (add-on)Pillow-top seat (add-on)

Lowers easily and safelyLowers easily and safely– Controlled by the release Controlled by the release

valve of the jackvalve of the jack

Long wearing finishLong wearing finish– Powder CoatPowder Coat

Maintenance FreeMaintenance Free– No required maintenanceNo required maintenance

CostCost– Final Prototype Cost $165Final Prototype Cost $165

Lifting CapacityLifting Capacity– PDS requirement not metPDS requirement not met

New AdditionsNew Additions

Some unpredicted motion of the chair has Some unpredicted motion of the chair has cause the team to redesign and add a cause the team to redesign and add a guide block and bearings to the design. guide block and bearings to the design. The bearings will be attached to the The bearings will be attached to the centerline of bolts on the scissor members centerline of bolts on the scissor members and will ride up a vertical block to stabilize and will ride up a vertical block to stabilize the vertical motion of the lift.the vertical motion of the lift.

QuestionsQuestions