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-May
Concept Presentation
Determine Final Concept
Define Most Critical Module
Design Most Critical Module
Manufacturing Plan/Techniques for MCM
Presentation/Prototype of MCM
Complete Design of Other Modules
Manufacture Prototype of Other Modules
Poster for Museum of Science
Assemble and Integrate Modules
Functional Testing of Completed Product
Iterations 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
Joint Strength
Cost
Ease of
Manufacturing
Durability
Ease of
Maintenance
Ease of Use
Projected
Weight
Aesthetics
Availability of
Parts
Totals
Re
m
ov
al
co
pi
ng
les
Te
ZFo
ld
La
zy
To
ng
t
Re
v
W olvi
he ng
el
Fr
on
90
°F
ro
nt
W
he
el
The Actual Pugh Chart
0
1
0
0
-2
-3
-1
0
1
-1
1
1
1
0
-2
0
-1
1
1
1
-2
0
-1
4
0
-1
-2
-1
-1
2
1
0
3
0
-1
-2
0
0
-1
0
-1
0
1
2
3
2
1
0
1
1
-3
-2
0
1
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