1. 2.009 Green B Sketch Model Review October 5th, 2006
Eye to Eye Wheelchair
2.009 Green B
Sketch Model Review
October 5th, 2006

2. Presentation Outline Customer Needs Customer & Market Product Design
Technical Feasibility
Future Steps
Questions

3. Eye-to-Eye for the first time!
Customer Needs
Eye-to-Eye for the first time!

4. Customer & Market Customer Market Size
Athletic, Younger, Stronger Wheelchair Users
Hospitals
Rentals/Lend-outs
Market Size
3 Million Wheelchair Users
Target Market: ~ 1 Million

5. Product Design

6. Technical Feasibility
Mechanisms Used
Ratcheting Lift System
Belt Driven Wheels
Assumptions
100 kg person
Lift distance of 0.5 m
Cost ~ $1000

7. Future Steps Design Areas Contact: TBD Appropriate lift mechanism
Drive System
Ergonomics
Contact: TBD

8. Questions?

9. Backup Slides

10. Technical Details Ratchet Force (for lift) Wheel Ratio
10 ratchet pushes required
If ~30 degrees, requires 50N of force each time  Reasonable
Wheel Ratio
1:1 possible for: 100kg person, coefficient of friction = 1.7 (tire with concrete)
Reasonable equivalence at 5mph chair speed

11. Cost Breakdown $400 Wheelchair Base $100 Modified Seat
$200 Extra Frame
$200 Extra Wheels
$50 Air Jack
TOTAL ~ $1,000
Electric/Fancy Manual WCs are $1500-$2000