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Enhanced Mobility Wheelchair
Addressing the Systemic Barriers
of Ordinary Wheelchair Use
Jared Uramowski
Matthew Levy
Jon ...
Motivation for Accessibility Focused Project
● Relatives with underlying medical conditions
that hinder mobility
● Freedom...
Initial Concepts
● Offroad Wheelchair
○ Allows outdoorsman to keep their hobbies, such as hiking or fishing
● Winter-use W...
User Group Consultation - Mike Frogley
● National Academy Director and Head Coach of
Wheelchair Basketball Canada
● Helped...
Considerations for a Wheelchair Alternative
● Traditional chair operation causes fatigue
● High value on user independence...
Solution
● Improve ergonomics through a new
propulsion system using rowing
motion
● Allow variable speed and output force
...
Prototype Chair CAD Model and Features
7
Lever Rotation
Bicycle Wheels
Chain Drive
between
Lever and
Wheel
Final Result
8
Final Result
9
Final Result Details
10
● Lever connected to a ratchet
mechanism
● Ratchet has a sprocket
attached, which drives chain
● C...
Final Result Details
11
● Bicycle brakes added for
higher braking force
● Brake lever and shifter
used from a bicycle
Prototype Validation - Functionality
7° incline
holding
force
● Braking distance greatly improved
● Jogging speeds can be ...
Prototype Validation - Ergonomics
13
● Ergonomic Validation done by Andrew Hopf, MSc, CSCS and Zack
Marchildon, MSc Kinesi...
Future Considerations
14
● Use sprag clutches for smoother operation and no “ratcheting” noise
● Investigate a more effect...
Thank You!
15
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FWD50 2019 - In Conversation With The 2019 IDeA (Innovative Design For Accessibility) Winners

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Jared Uramowski - Winner, 2019 IDeA Canada Competition, Architectural / Industrial Design barriers
Matthew Levy - Winner, 2019 IDeA Canada Competition, Architectural / Industrial Design barriers

How do we use technology to make society better for all? Each year, the IDeA (Innovative Design for Accessibility) awards showcase outstanding innovations that use technology to make the world more accessible for everyone.

In this series of case study presentations, three IDeA winners will discuss how they identified accessibility issues and potential solutions, what they did to understand users and their needs, and the results of their work. Come and see how great design and smart technology can raise the bar for everyone!

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FWD50 2019 - In Conversation With The 2019 IDeA (Innovative Design For Accessibility) Winners

  1. 1. Enhanced Mobility Wheelchair Addressing the Systemic Barriers of Ordinary Wheelchair Use Jared Uramowski Matthew Levy Jon Cameron Kristian Vande Kemp Evan McColl Advised by: Professor Peter Teertstra, University of Waterloo 1
  2. 2. Motivation for Accessibility Focused Project ● Relatives with underlying medical conditions that hinder mobility ● Freedom limited to “accessibility” areas when relying on medical assist devices ● Users fear loss of independence and poor quality of life 2
  3. 3. Initial Concepts ● Offroad Wheelchair ○ Allows outdoorsman to keep their hobbies, such as hiking or fishing ● Winter-use Wheelchair ○ Enables independence year round, even in harsh conditions ● Electric Assist Wheelchair with Regenerative Braking System ○ Able to assist with hill climbing, without the ties of a fully electric chair 3
  4. 4. User Group Consultation - Mike Frogley ● National Academy Director and Head Coach of Wheelchair Basketball Canada ● Helped to narrow the project scope ● Discussed the divide between assist device applicability ● Trade-off between maneuverability and efficiency 4
  5. 5. Considerations for a Wheelchair Alternative ● Traditional chair operation causes fatigue ● High value on user independence ● Current alternatives (electric) are expensive and revoke self-sufficient use ● Users value appearance of the chair ● Few options currently satisfy all requirements for everyday use; long term use without fatigue, maneuverability, and efficiency 5
  6. 6. Solution ● Improve ergonomics through a new propulsion system using rowing motion ● Allow variable speed and output force with varying gear ratios ● Build onto a typical wheelchair to retain maneuverability 6
  7. 7. Prototype Chair CAD Model and Features 7 Lever Rotation Bicycle Wheels Chain Drive between Lever and Wheel
  8. 8. Final Result 8
  9. 9. Final Result 9
  10. 10. Final Result Details 10 ● Lever connected to a ratchet mechanism ● Ratchet has a sprocket attached, which drives chain ● Chain drives gears inside rear-wheel hub Chain Lever and ratchet Rear Wheel Hub
  11. 11. Final Result Details 11 ● Bicycle brakes added for higher braking force ● Brake lever and shifter used from a bicycle
  12. 12. Prototype Validation - Functionality 7° incline holding force ● Braking distance greatly improved ● Jogging speeds can be reached with ease ● Reduction in hill climb force
  13. 13. Prototype Validation - Ergonomics 13 ● Ergonomic Validation done by Andrew Hopf, MSc, CSCS and Zack Marchildon, MSc Kinesiology ● Lever drive uses larger muscle groups, such as pectorals and the teres major ● Ordinary wheelchair uses many small muscles in the wrist and arms, which are what often causes fatigue ● Results confirmed in a test by a family relative who is a wheelchair user ○ Ease of operation uphill, less strain noticed on arm muscles
  14. 14. Future Considerations 14 ● Use sprag clutches for smoother operation and no “ratcheting” noise ● Investigate a more effective reverse mechanism ● Adjustable lever height ● Adding a neutral gear and a parking brake would make it easier to enter/exit chair
  15. 15. Thank You! 15

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