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