Post on 26-Dec-2015
Telescoping Wheelchair Ramp
Frank Genova – Team Leader Daniel PetersAnthony RossiDean Perdikakis
Department of Mechanical Engineering Villanova University
Telescoping Wheelchair RampIntroduction:
Difficulties in today’s society for handicapped individuals.
Ramps on the market not efficient in many cases.
Maneuver, Ease of Use, Weight Reduction
Telescoping Wheelchair RampBackground state of the art:
Research, 2-3 step vertical rise (24”).
ADA requirements:
Power Wheelchair
ADA adjustments
I ncline Chart
16.5° 34"
15.5° 32"
14.5° 30"
17° 13.5° 28"
15.7° 12.5° 26"
16.6° 14.5° 11.5° 24"
15.2° 13.2° 10.6° 22"
16.1° 13.8° 12° 9.6° 20"
14.5° 12.4° 10.8° 8.6° 18"
15.5° 12.8° 11° 9.6° 7.7° 16"
17° 13.5° 11.3° 9.6° 8.4° 7.7° 14"
14.5° 11.5° 9.6° 8.2° 7.2° 5.7° 12"
16.1° 12° 9.6° 8° 6.8° 6° 4.8° 10"
14.5° 10.8° 8.6° 7.2° 6.2° 5.4° 4.3° 9"
12.8° 9.6° 7.7° 6.4° 5.5° 4.8° 3.8° 8"
17.5° 11.2° 8.4° 6.7° 5.6° 4.8° 4.2° 3.3° 7"
14.5° 9.6° 7.2° 5.7° 4.8° 4.1° 3.6° 2.9° 6"
12° 8° 6° 4.8° 4° 3.7° 3° 2.4° 5"
9.6° 6.4° 4.8° 3.8° 3.2° 2.7° 2.4° 1.9° 4"
7.2° 4.8° 3.6° 2.9° 2.4° 2° 1.8° 1.4° 3"
Rise in
inches
2’ 3’ 4’ 5’ 6’ 7’ 8’ 10’
Ramp Length
4.8° - Americans with Disabilities Act standards suggests 1 foot of ramp for every 1 inch of vertical rise.
Telescoping Wheelchair RampBackground state of the art:
Separate Runners
Weight Reduction (PRO) -Aluminum Design
Set-up, Maneuverability, Transportation (CON)
Telescoping Wheelchair RampBackground state of the art:
Roll up Ramp
Weight Reduction (PRO) -Aluminum Design.
Wide 30” Surface (PRO)
Structural Integrity (CON) -Max 5’ Length
Telescoping Wheelchair RampBackground state of the art:
Full Width Ramp
Only Van Design Exists
Extends up to 8’ (PRO)
30” driving surface (PRO)
Ramp weighs 65 lbs (CON)
Cumbersome telescoping system (CON)
QFD:
Telescoping Wheelchair RampProduct Design Specification:
Product Title Purpose New or Special
Features Competition Intended Market Need for Product Relationship to
existing products line Market Demand
Price Functional
Performance Physical Requirements Service Environment Life-cycle Issues Human Factors Corporate Constraints Legal Requirements
Telescoping Wheelchair RampPreliminary Designs:
Telescoping Mechanism
Ease of use and maneuverability
Two ideas proposed
Spring Loaded Snap System
Pulley System
Telescoping Wheelchair RampSpring Loaded Snap System:
Side View
Telescoping Wheelchair RampSpring Loaded Snap System:
Top View
Telescoping Wheelchair RampPulley System:
Side View
Telescoping Wheelchair RampPulley System:
Top View
Telescoping Wheelchair RampComposites: Composite design
Information received through Dr. Brian Sullivan, specializing in composites.
Model as simply supported (max. deflection in center, max. moments at fixed ends).
Transverse, uniaxial loading
Carbon fiber reinforced epoxy (E = 3.4E+6).
0/45/90/-45 Layup
Layup
Telescoping Wheelchair RampStatement of Work and Design:
Spring Loaded Pin System chosen
Interlocking aluminum guide rails on one side
Ramp adjustable to any length
360° wheels on underside for ease of opening
Composite Panels
Rubber non-slip surface
Rubber Ends
Telescoping Wheelchair RampTime Allotment of Tasks:
TASK WEEKS GROUP MEMBER(S) ON TASK HOURS
Find / design individual parts for design 2 Frank, Dan, Tony, Dean 24Calculate stress on pins (hand) 1 Frank, Dan 4Calculate stress on aluminum runners (hand) 1 Frank, Dan 4Calculate stress on aluminum guides (hand) 1 Frank, Dan 4
Calculate stress in composite material, with stress concentration factors for fasteners and wholes (hand) 2 Frank, Dan 8Calculate stress on underside supports (hand) 2 Frank, Dan 8Model aluminum runners (AutoCAD / Solid Works) 1 Tony, Dean 8Model aluminum guides (AutoCAD / Solid Works) 1 Tony, Dean 8Model snap pin system in AutoCAD / Solid Works 1 Tony, Dean 8Model composite panel in AutoCAD / Solid Works 1 Tony, Dean 8Model underside supports in AutoCAD / Solid Works 1 Tony, Dean 8Build physical model of design 3 Frank, Dan, Tony, Dean 60Test device for working ability and safety 2 Frank, Dan, Tony, Dean 35Adjust and recalculate for final design 2 Frank, Dan, Tony, Dean 32Write mid semester progress report 1 Frank, Dan, Tony, Dean 16Write final report 2 Frank, Dan, Tony, Dean 32Prepare for oral presentation 2 Frank, Dan, Tony, Dean 48
Telescoping Wheelchair RampGantt Chart:
TasksWk 1 Wk 2 Wk 3 Wk 4 Wk 5 Wk 6 Wk 7 Wk 8 Wk 9
Wk 10
Wk 11
Wk 12
Find / design individual parts for design
Calculate stress on pins by hand
Calculate stress on aluminum runners by hand.
Calculate stress on aluminum guides by hand.
Calculate stresses in composite
Calculate stress on underside supports by hand.
Model aluminum runners in AutoCAD / Solid Works.
Model aluminum guides in AutoCAD / Solid Works.
Model snap pin system in AutoCAD / Solid Works.
Model composite panel in AutoCAD / Solid Works.
Model underside supports in AutoCAD / Solid Works.
Build physical model of design.
Test device for working ability and safety.
Adjust and recalculate for final design.
Write mid semester progress report
Write final report
Prepare for oral presentation
Telescoping Wheelchair RampCost Analysis:
*costs based on an individual production basis. If large production of these ramps occurs, prices will dramatically decrease.
Item Approximate Cost
Composite Panels – Three 35” x 30” panels (carbon fiber reinforced epoxy)
$150/each
Spring Loaded System – Two pins in the middle panel of the ramp
$50
Rubber non-slip surface – (Soft Tread) Should cover the length of the ramp plus ends
$60
Interlocking Aluminum Rails – Covering both sides of ramp.
$60
Other Costs: fasteners, tools, etc. $50
TOTAL COST $670
Telescoping Wheelchair RampConclusion:
Overall design is feasible
Composites complicated and detailed
Panel construction and “prepreg” construction
Company location