Adaptation of Van with a Wheelchair Lifting System
Group Eight Members:
Bill Fotoples- Team Leader
Chad Wainscott- Technical Liaison/Web Page Specialist
Ryan Keeler- Purchasing Agent
Faculty Advisors- Dr. Hefzy & Dr. Pourazady
Client- Ms. Jill Caruso
Sponsors- Ability Center and National Science Foundation
03/24/07 Bill Fotoples 2
Problem Statement Sliding door opening is roughly 28” wide Wheelchair is roughly 35”x 26” (footprint) Chair is initially parallel to the van but must be rotated
perpendicular to fit through the door With less than 1 inch of clearance on both sides of the chair, the
device must be very consistent and accurate
03/24/07 Bill Fotoples 3
Client Preferences
No traditional platform lifts Keep it simple - Client is willing and able to
“help” the chair into the van however possible Do not decrease resale value of the vehicle by
making too many permanent changes Would like to be able to easily transplant the
device to a new van in the future
03/24/07 Ryan Keeler 4
Design Ideas
1: Platform Lift 2: Side-Bar Lift
3: Under-Seat Lift 4: Winch Assisted Lift
03/24/07 Ryan Keeler 5
House of Quality
CUSTOMER REQUIREMENTSCUSTOMER
IMPORTANCE RATING
DESIGN 1: PLATFORM LIFT
DESIGN 2: SIDE-BAR LIFT
DESIGN 3: UNDER-SEAT
LIFT
DESIGN 4: WINCH
ASSISTED LIFT
EASE OF USE 5 4 4 4 2
EASILY TRANSPLANTED 4 1 2 3 5
SAFETY 4 4 3 3 3
RELIABILITY 3 4 4 4 5
UNINTRUSIVE 4 1 2 3 5
VALUE 56 60 68 77
03/24/07 Ryan Keeler 6
Best Option… Design #4
Best design to use with minimal space allowed
Easily placed in new vehicle because of plywood base
Tracks allow process and placement to be extremely accurate and repeatable
03/24/07 Bill Fotoples 7
3D model of final design
Entire assembly is on a 13.5 degree angle in relation to van entrance
Inner tracks will be adjustable to allow different width wheelchairs to be used
03/24/07 Bill Fotoples 8
Prototype/Replica Testing and Analysis
Constructed mock-up of interior van layout Conducted testing to analyze entry angle, winch placement and
ramp assist design
03/24/07 Bill Fotoples 9
Prototype/Replica Testing and Analysis
Created computer models based on replica testing to further analyze setup
03/24/07 Chad Wainscott 10
Material Selection
Winch Support Beam Material: 3x1x1/8” Rectangular Tubing
High strength to weight ratio, easily welded and fabricated 0.25 inch weld to 1/8” steel base
Ramp Material: 16 GA (0.060”) Low Carbon Steel
Reinforced using track material
Base Material: ¾” Plywood - Carpeted
Track Material: General-Purpose Low-Carbon Steel
1-½” Leg Length 3/16” Thickness
03/24/07 Chad Wainscott 11
Ramp Calculations
AutoCAD was used to analyze ramp to formulate dimensions
03/24/07 Chad Wainscott 13
Winch Support Beam Weld Analysis
Weld Analysis
V 85 Sy 50 000
b 3 Ssy 28850
c 0.5 d 1
MA 85.1 15( ) 45 3.5( )
MA 1.434 103
h 0.25 Assumed 0.25'' weld
Aweld 0.707h 3 3 1 1( )
V
Aweld Shear Stress
60.113
Iud2
63 b d( )
I 0.707h Iu Second moment of inertia
MA c
I Normal stress
2.434 103
total 2
2
total 2.435 103
nSsy
total
n 11.85
03/24/07 Ryan Keeler 14
HP/Force RequirementsWinch analysis
Wc 31 Weight of chair (lb)
Weight of winch (lb)Ww 14
V 14 Velocity of winch cable (ft/min)
Fc31
sin9
Initial force required to pull chair (lb)
Fc 90.638
HPreq
Fc V
33000
Required horse power to pull chair
HPreq 0.038
HPrated 1.5 Winch rated horse power
FSw
HPrated
HPreq
Factor of safety for the winch
FSw 39.009
03/24/07 Ryan Keeler 15
Bolt AnalysisBolt Analysis
r1 1.41697 inN 3 bolts
e 3.5 in r2 1.41697 in
P 45 lbfr3 3.75 in
FprimeP
N
Fprime 15lbs
bolt
Fdp1
P e r1
r1 r2 r3 Fdp1 33.897
F1 Fprime2Fdp1
2 F1 37.067 lbf
Fdp2
P e r2
r1 r2 r3 Fdp2 33.897
F2 Fprime2Fdp2
2 F2 37.067 lbf
Fdp3
P e r3
r1 r2 r3 Fdp3 89.707
F3 Fprime2Fdp3
2 F3 90.952 lbf
03/24/07 Ryan Keeler 16
Bolt Analysis
dbolt 0.25 t1 0.125 t2 0.375 Abolt
dbolt2
4 Aplate t1 dbolt
Sybolt 95725 Ssybolt Sybolt 0.577 Syplate 26000
Shear Stress Analysis Factor of Safety
1F1
Abolt 1 755.126 FS1
Ssybolt
1 FS1 73.144
2F2
Abolt 2 755.126 FS2
Ssybolt
2 FS2 73.144
3F3
Abolt 3 1.853 10
3 FS3
Ssybolt
3 FS3 29.81
Plate Bearing Failure Factor of Safety
1F1
Aplate 1 1.186 10
3 FSp1
Syplate
1 FSp1 21.92
2F2
Aplate 2 1.186 10
3 FSp2
Syplate
2 FSp2 21.92
3F3
Aplate 3 2.91 10
3 FSp3
Syplate
3 FSp3 8.933
03/24/07 Chad Wainscott 19
BudgetITEM EXPLANATION OF USE
PROPOSED COST
QUANTITY
TOTAL PROPOSED
COST
ACTUAL PURCHASE
PRICE
WINCH PULL CHAIR INTO VAN $200.00 1 $200.00 $53.36
PLYWOOD BASE OF ASSEMBLY $10.00 1 $10.00
CARPET COVER BASE AND TRACKS $20.00 1 $20.00
ANGLE IRON (1.5" x 6') TRACKS/CHAIR ALIGNMENT $21.00 2 $42.00
PIANO HINGEATTACH FOLD OUT TRACK
EXTENSION$20.00 1 $20.00
MISC. (BOLTS, SCREWS, ETC.)
INSTALLING COMPONENTS $20.00 1 $20.00
DOOR MODIFICATION SLIDING DOOR ASSIST $50.00 1 $50.00
PROTOTYPE MATERIAL INITIAL TESTING $25.00 1 $25.00 $25.00
STEEL U-CHANNELWINCH PLATFORM REINFORCEMENT
$48.00 1 $48.00
SHEET METAL (3' x2') RAMP/"C" WINCH PLATFORM $36.50 2 $73.00
WINCH HOOK ATTACH WINCH TO CHAIR $30.00 1 $30.00
MACHINE SHOP LABOR $65/Hr 3 $195.00
TOTAL W/ LABOR $733.00
TOTAL W/O LABOR $538.00
BUDGET REMAINING $459.64
03/24/07 Bill Fotoples 20
Future Activities
Complete FEA analysis of ramp and finalize calculations
Finalize CAD drawings for machine shop Order material and begin final assembly
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