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 12

Winch Support Beam Deflection Analysis

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 Ryan Keeler 17

Door assist analysis

03/24/07 Chad Wainscott 18

Timetable

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

03/24/07 21

QUESTIONS?