P14007: Wheelchair Assist

Che-An LeePhil MedalieDan Schuster

Tom Elliot

Team RolesMember Role

Che-An Lee Industrial Engineer/Project Manager

Phil Medalie Mechanical Engineer

Dan Schuster Mechanical Engineer

Tom Elliot Electrical Engineer

Agenda● Background● Problem Statement● Current Product● Stakeholders● Project Deliverables● Use Scenarios● Needs List● Theory of Operation● Engineering Requirements● House of Quality● Project Schedule

Background

• Current manual wheel chair users face many daily challenges

• Wheel Chair Assist Devices• Movement Assist Devices• Anti-Roll back Devices• Anti-Tip Devices

Problem Statement• Current State

– Current anti-roll back and anti-tip products exist that can be added onto wheel chairs, as well as motorized wheel chairs to provide movement assistance

– Majority of manual chairs do not come standard with these devices – Many of these assistance devices are expensive and inhibit some of the benefits of manual chairs

• Desired State– The device should maintain all of the benefits of a manual wheel chair(light weight, small turning

radius, compact, etc.)– The device should also be able to aid the user when traversing inclines and declines, as well as

prevent roll back/tip-over movements• Project Goals

– Design a system that encompasses the 4 desired properties while maintaining the key benefits of a manual chair

– Key Desired Properties• Ability to provide movement assist up inclines• Ability to decelerate the user when moving down declines• Ability to prevent the wheel chair from rolling back down a hill and slipping out from under user• Ability to prevent the wheel chair from tipping over backwards

• Constraints– The wheel chair should still meet ADA standards regarding size constraints(doorways, buildings, etc.)– System Cost

Current Products• Anti-Tip Devices• Anti-Rollback Devices• MagicWheels

• Manual Chairs• Motorized Chairs

Image References: http://www.rehabmart.comhttp://www.magicwheels.com/

Stakeholder

● Wheelchair User● Caretaker● Inventor● MSD Team● RIT

Project Deliverables

• Functional prototype which can be marketed to manufactures and a basis for a product that will ultimately be manufactured

• Test data verifying engineering requirement• User’s guide for operation• Alternative design for future project

P 14007 Needs ListNeed Priority

Anti-Roll Back 9Anti-Tip Over 9De-acceleration Downhill 9Movement Assist Uphill 9Detachable Design 3Low Weight 3Collapsible 3Low Cost 3Medically Approved for Use 3Small Turning Radius 9Size, Overall 9Large User Weight Range 3Chair is Stable when Transferring In/Out

9

Disengageable Device 9

Use Scenarios Considered

• User is going up a ramp, user regain grip and chair stops, incline assist activates to stops the chair from rolling down the ramp and provide energy to assist user move up the ramp

• User is going down a ramp, user activates decline assist, chair de-accelerate and maintain a constant speed

• User transporting in/out from the chair, anti-rollback activates to prevent chair rollback

Theory of Operation

Engineering Requirement

Engineering Requirement Cont’d

Engineering Requirement Cont’d

House of Quality

9 X X9 X9 X9 X X3 X X3 X3 X3 X3 X X9 X9 X X3 X9 X9 X X X X

Measure lbf seconds Degrees seconds Degrees mph seconds ft mph seconds lbf $ in ft lbf minutes in in cycles binary binary in

Engineering Requirement

Low Cost

Anti-Roll BackAnti-Tip Over

Min

imum

Spe

ed U

p In

clin

e of

10

Deg

ree w

ifth

of

300l

bf u

sing

Mov

emen

t Ass

ist

De-acceleration DownhillOmvement Assist UphillDetachable DesignLow WeightCollapsible

Needs Priority

Disengagable Devices

Medically Approved for Small Turning RadiusOverall SizeLarge User Weight RangeChair is Stable when

Len

gth

of W

heelch

air +

Mov

emen

t Sys

tem

Max

imum

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t at I

nclin

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10

Deg

rees

whe

re

the W

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ot R

oll B

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ars

Max

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Spe

ed a

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Deg

rees

at

300

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ser W

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Whe

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Eng

agem

ent A

ngle

Use

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Max

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efor

e Tip

ping

Ove

r Bac

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ith U

ser W

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Use

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ack

Whe

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idth

whe

n Fo

lded

Cos

t of W

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ssist

Sys

tem

Tim

e to

Rem

ove W

heelch

air A

ssist

Sys

tem

Max

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Sta

tic U

ser W

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t

Whe

elch

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Rad

ius

Whe

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Sys

tem

Weigh

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Use

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ssist

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Use

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Dist

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Cha

ir R

olls

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ir

Cor

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All

Part

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asily

Rep

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Critic

al M

echa

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ave X

num

ber of

U

se C

ycles

Wid

th o

f Whe

elch

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Mov

emen

t Sys

tem

Key Performance Metric

Project Schedule

Questions/Comments?