1. Developing the Folding 3-Wheeler March 6, 2007

2. Background/Justification Allow user to gain access to public transportation. Facilitate the process of transporting the user and the wheelchair safely.

3. Goal To design a folding three wheeled wheelchair that has the kinematic advantages of a 3-wheeler, but the portability of a folding 4-wheeler.

4. Original Functional Requirements Fold compactly when not in use Be comfortable and ergonomic Light enough so the user can carry it

5. But then…

6. Primary Functional Requirements Ability to fold compactly Made from cheap and available materials Easy to manufacture Sturdy

7. Design Parameters

8. Cheap and Available Materials Design constraints  Joints must be prismatic or revolute.  Use of only 25mm pipe.  26” wheels.  Limited tool set. Design Freedoms  Use of bike parts

9. Easy to Manufacture Timeline to completion: 3 days  Can extend production time to 4 days. Cost vs. Benefit

10. Sturdy Sacrifice portability for rigidity?

11. Current Brainstorming/ Strategies

13. Countermeasures Modularity  Easily detachable features  “snap together”  Only uses one “extra” tool

14. Questions?