Concepts for the Folding 3-Wheeler

March 22, 2007

Community Needs

• Allow user to gain access to public transportation.

• Facilitate the process of transporting the user and the wheelchair safely.

Functional Requirements

• Ability to fold compactly• Made from cheap and

available materials• Easy to manufacture• Sturdy

Gantt Chart

23-Mar 30-Mar 6-Apr 13-Apr 20-Apr 27-Apr 4-May 11-May 18-MayConcept Presentation

Determine Final ConceptDefine Most Critical ModuleDesign Most Critical ModuleManufacturing Plan/Techniques for MCM

Presentation/Prototype of MCMComplete Design of Other ModulesManufacture Prototype of Other Modules

Poster for Museum of ScienceAssemble and Integrate ModulesFunctional Testing of Completed ProductIterations of Modules

Final Presentation

Most Critical Module

What to do with the 3rd Wheel?

Ideas

• 90 Degree Front Wheel• Revolving Front Wheel• Lazy Tong• Z-Fold• Telescoping• Removable

The Pugh Chart

The Actual Pugh Chart

90° Front WheelRevolving Front WheelLazy Tong

Z-FoldTelescoping

Removal

Joint Strength 0 0 -2 -1 1 1Cost 1 0 -3 0 -1 1

Ease of Manufacturing

1 0 -2 0 -1 1

Durability 1 1 -2 0 -1 4Ease of

Maintenance0 -1 -2 -1 -1 2

Ease of Use 1 0 3 0 -1 -2Projected

Weight0 0 -1 0 -1 0

Aesthetics 1 2 3 2 1 0Availability of

Parts1 1 -3 -2 0 1

Totals 6 3 -9 -2 -4 8

Other Modules

How else can we reduce the size?

Other Modules

• Folding Seat Back• Folding Seat Butt• Folding Chassis

Countermeasures

Countermeasures

• Take this seminar again!• Fold in only one direction• Prepare a packet with our

engineering drawings and a CD of our animations