Developing the folding 3 wheeler
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Developing the Folding 3-Wheeler. March 6, 2007. Background/Justification. Allow user to gain access to public transportation. Facilitate the process of transporting the user and the wheelchair safely. Goal.

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Background justification
Background/Justification

  • Allow user to gain access to public transportation.

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


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.


Original functional requirements
Original Functional Requirements

  • Fold compactly when not in use

  • Be comfortable and ergonomic

  • Light enough so the user can carry it



Primary functional requirements
Primary Functional Requirements

  • Ability to fold compactly

  • Made from cheap and available materials

  • Easy to manufacture

  • Sturdy



Cheap and available materials
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


Easy to manufacture
Easy to Manufacture

  • Timeline to completion: 3 days

    • Can extend production time to 4 days.

  • Cost vs. Benefit


Sturdy
Sturdy

  • Sacrifice portability for rigidity?



Countermeasures
Countermeasures

  • Modularity

    • Easily detachable features

    • “snap together”

    • Only uses one “extra” tool



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