The eBrush
Elana ChengAvery Horn
Jasmin KhooAlex Kun
Outline
• General plan• Survey • Dissection• Data• Concepts
Project Management
Final hierarchal customer needs chartRevised problem statement
The purpose of this project is to redesign an electric toothbrush that will better serve the customer. After research and data collecting it has been determined that the toothbrush’s noise is too loud and it is a bulky figure. The purpose of this project is to redesign a mechanical toothbrush to decrease the vibration sounds and the energy required to run. To decrease the size of the base of the toothbrush to decrease cost and materials needed for mass reproduction. The team has decided to take a mechanical engineering discipline to improve on these issues.
1 Maintenance 1.1 Water-proof seal for batteries 1.2 Easy to clean 1.3 Minimal Crevices2. Green C.1 Less plastic 2.2 Speed Settings 2.3 More power effi cient3. User Friendly 3.1 Light weight 3.2 Easy to Hold C.2 Low noise 3.4 Interchangable heads 3.5 Longer neck 3.6 More flexible head4. Image 4.1 Oral-B ID 4.2 Colors
Summary of external search activities
• Patents• Concepts• Benchmarking• Product archeology
Power generation concepts
Energy mechanism for brush head Concepts
Brush Head Concepts
Human factors body design Concepts
Morphological chart
Criteria for concept selection
• Customer needs– Easy to hold– Interchangeable heads– Longer neck– Easy to clean– Water proofing– More power efficiency– Maintenance
Power GenerationSize Cost Weight Sum Rank
Relative weight 0.25 0.25 0.25Concepts
2 AA batteries 0 1
3 AAA batteries -1 0 -1 -0.5 2
Chargeable -1 -1 0 -0.5 2
Charging dock 0 -1 -1 -0.5 2
Iteration 1 & 2
Size Cost Weight Sum Rank
Relative weight 0.25 0.25 0.25
Concepts
2 AA batteries +1 0 +1 0.5 1
3 AAA batteries 0 2
Chargeable -1 -1 -1 -0.75 3
Charging dock -1 -1 -1 -0.75 3
Energy Mechanism for Brush HeadSize Cost Weight Sum Rank
Relative weight 0.25 0.25 0.25Concepts
Dual Spin 0 1
Up & Down -1 0 0 -0.25 2
Back & Forth -1 -1 0 -0.5 3
Spin 360° -1 -1 0 -0.5 3
Size Cost Weight Sum Rank
Relative weight 0.25 0.25 0.25Concepts
Dual Spin +1 -1 0 0 1
Up & Down 0 1
Back & Forth -1 0 0 -0.25 2
Spin 360° +1 -1 -1 -0.25 2
Iteration 1&2
Brush Head DesignSize Cost Weight Sum Rank
Relative weight 0.2 0.2 0.2
ConceptsColor ID 0 1
One spinning 0 -1 0 -0.2 2Dual Spin 0 -1 +1 0 1
1 move 2 stationary -1 -1 -1 -0.6 3Side to side -1 -1 -1 -0.6 3
Size Cost Weight Sum RankRelative weight 0.2 0.2 0.2
ConceptsColor ID +1 +1 +1 0.6 1
One spinning +1 0 -1 0 2Dual Spin +1 +1 +1 0.6 1
1 move 2 stationary 0 2Side to side 0 0 0 0 2
Iteration 1 & 2
Human Factors Body DesignSize Cost Weight Sum Rank
Relative weight 0.2 0.2 0.2
ConceptsTwist power 0 3
Form to hand 0 +1 +1 0.4 1Gel handle 0 +1 0 0.2 2Thick gel 0 +1 -1 0 3
Power button 0 +1 +1 0.4 1
Iteration 1& 2
Size Cost Weight Sum Rank
Relative weight 0.2 0.2 0.2
Concepts
Twist power 0 -1 0 -0.2 2
Form to hand 0 1
Gel handle 0 0 -1 -0.2 2
Thick gel 0 -1 -1 -0.4 3
Power button 0 0 0 0 1
Final Design
• 2 AA batteries• Color ID• Dual spin head• Form to hand grip• On/off button• Single motor
CAD Drawing
How does it work?
• Motor spins moving two pieces separately.• Moves two different parts of the brush head• Two rotating heads maximize cleaning ability
Final Design VS Customer Needs
• 2AA batteries• Different plastic• Under $20• On/off button & Color
ID
• Rechargeable dock• Green• Price• Ease of use
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