Trike Frame Redesign Concept Design

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 lt5 hours
• Frame Materials Costlt200-TBD
• Size lt 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
Most Critical ModuleSturdy Base Frame

• 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

• 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

8
Stackable Frame

• 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

9
The Adjustable Seat (with hand tools)

• Features/Advantages
• Adjustable to user
• Biomechanically optimized
• Risks
• 1) Adjustability over time
• Countermeasures
• Maintenance Guide

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