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Trike Frame Redesign Concept Design

Trike Frame Redesign Concept Design. Fiona Hughes Gina Policelli Jodie Wu. Community Partners Response. Biggest problem with current tricycle frames: (i)The Frame is not adjustable though it is made of standard size to suit most users and small size is also available. (ii)It is very bulky

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Trike Frame Redesign Concept Design

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  1. Trike Frame RedesignConcept Design Fiona Hughes Gina Policelli Jodie Wu

  2. Community Partners Response • Biggest problem with current tricycle frames: • (i)The Frame is not adjustable though it is made of standard size to suit most users and small size is also available. • (ii)It is very bulky • Reasons for current tricycle breakage: • “Our design is made of round tubing having several bends forming a base frame. If the tube is flattened on bending or the material is a bit thin then it breaks easily. Also if the type of tubing frame do not withhold the weight of the persons then it breaks.” • Most time consuming part of building a frame: Bending the frame • Most expensive frame material: Round hollow tubing 25 X1.5 mm for base frame. • Man-hours to produce a frame: 5 hours

  3. Community Partners Concerns • Does the size and weight of tricycle cause problems for the users? • Yes it is bulky and weighs almost 25kg. • Are there any size limitations? • Yes. The oversize people will have to use the stronger material and also the tricycle has to be wider and extra large for accommodation. • Where are the tricycles sold? • Large number of tricycles are given free to the disabled persons wither from the workshops or the specified project where they are delivered for handing over. • How are they transported from the shop to the users home? • They are transported by vehicles e.g. courier services it far or the owners come for handing over and cycle them to their homes.

  4. Functional Requirements • Strength: withstand 350 lbs of load • Strengthen and stiffen high moment areas • Manufacturing time: <=5 hours • Frame Materials: Cost<$200-TBD • Size: <= 50” in length and 26” in width (including wheels) • Seat: More comfortable, adjustable, waterproof • Shippable: Stackable Design

  5. Defining the Concept • Concept: • Adjustable to the user • Stackable Frame for shipping • Goals: • To address this concept by developing modules • Develop Most Critical Module

  6. Our Concept and Modules

  7. Features/Advantages: Rectangular pieces (stronger base) Distribution of load Risks: 1) Joint issues between square and circular cross sections 2) Attaching the stem in terms of sturdiness Countermeasures: 1) Place circular pipe against the square pipe rather than square pipe against the circular pipe 2) Use a pipe fitting in the section Most Critical Module:Sturdy Base Frame

  8. Features/ Advantages: Shippable to more clients Lowers shipping cost Countermeasures: 1) Provide a manual (with drawings) 2) Increase the safety factor Risks Assemblers on receiving side may not be able to put trike together Possible weakening of structure Stackable Frame

  9. Features/Advantages: Adjustable to user Biomechanically optimized Risks: 1) Adjustability over time Countermeasures: Maintenance Guide The Adjustable Seat (with hand tools)

  10. The Sliding Tray/Storage • Features/Advantages: • Convenience • Small Business Possibilities • Risk: 1) May tip tricycle over • Countermeasures: • Provide Counterweights, lower center of gravity

  11. Plan and Countermeasures • Plan: • Develop most critical module first • Solid model everything • Gather all materials and arrange lab times by end of April • Build Prototype • Countermeasure: • Build upon solid model to make a manual so design can be constructed in machine shop in Africa

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