P14007: Wheelchair Assist
description
Transcript of P14007: Wheelchair Assist
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
Weigh
t at I
nclin
e of
10
Deg
rees
whe
re
the W
heelch
air do
es n
ot R
oll B
ackw
ars
Max
imum
Dow
nhill
Spe
ed a
t Dec
line of
10
Deg
rees
at
300
lbf u
ser W
eigh
t
Whe
elch
air A
nti-T
ip R
otat
ion
Eng
agem
ent A
ngle
Use
r/A
ssist
or D
iseng
agea
lble A
nti-T
ip O
ver
Max
imum
Inclin
e A
ngle, B
efor
e Tip
ping
Ove
r Bac
kwar
ds w
ith U
ser W
eigh
t of 3
00lb
f
Use
r/A
ssist
or D
iseng
agea
lbe A
nti-R
oll B
ack
Whe
elch
air W
idth
whe
n Fo
lded
Cos
t of W
heelch
air A
ssist
Sys
tem
Tim
e to
Rem
ove W
heelch
air A
ssist
Sys
tem
Max
imum
Sta
tic U
ser W
eigh
t
Whe
elch
air Tur
ning
Rad
ius
Whe
elch
air A
ssist
Sys
tem
Weigh
t
Use
r/A
ssist
or D
iseng
agea
ble M
ovem
ent A
ssist
Mov
emen
t Ass
ist R
ange
at m
inim
um sl
ope of
1/1
2 at
300
lbf
Use
r/A
ssito
r D
iseng
agea
lbe D
ownh
ill D
eacc
eler
ator
Dist
ance
Cha
ir R
olls
Forw
ards
or Bac
kwar
ds w
hen
Tra
nsfe
rrin
g To/
From
Cha
ir
Cor
rosio
n R
esist
ant C
ompo
ents
All
Part
s/Com
pone
nts a
re E
asily
Rep
lace
eabl
e
Critic
al M
echa
nica
l com
pone
nts h
ave X
num
ber of
U
se C
ycles
Wid
th o
f Whe
elch
air +
Mov
emen
t Sys
tem
Key Performance Metric
Project Schedule
Questions/Comments?