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Toothbrush Design P roject. February 20, 2013 David Alvarado Ethan Kruder Kirk Santure Jessica Spoll. Design Process. Initial Problem Statement Customer Needs Assessment Hierarchal Customer Needs Pairwise Comparison Chart Weighted Hierarchal Customer Needs - PowerPoint PPT Presentation
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Toothbrush Design Project
February 20, 2013
David AlvaradoEthan KruderKirk Santure
Jessica Spoll
Initial Problem Statement Customer Needs Assessment◦ Hierarchal Customer Needs◦ Pairwise Comparison Chart◦ Weighted Hierarchal Customer Needs
Revised Problem Statement External Search◦ Product Dissection◦ Patent Search◦ Product Archaeology◦ Benchmarking
Concept Generation◦ Morphological Charts◦ Pugh Charts / Concept Selection
Final Design
Design Process
Task Days Needed Dates
Start 0 1/9
Team Assessment/ Introduction 3 1/9 to 1/11
Visual Inspection and Market Research 2 1/16 to 1/18
Customer Needs 7 1/18 to 1/25
Product Dissection 3 1/23 to 1/25
Patent Search 2 2/1 to 2/2
Concept Generation 3 2/8 to 2/11
Morphological Charts 2 2/11 to 2/13
Pugh Charts / Concept Selection 3 2/14 to 2/17
Solid Model of Design 1 2/17 to 2/18
Final Report 7 2/18 to 2/25
Presentation Preparation 3 2/17 to 2/20
Project Due 0 2/25
Project Management
1.Portable 1.1 Lightweight 2. User-Friendly 2.1 Low Noise 2.2 Comfortable Grip 2.3 Bristle Design 2.4 Left-hand Accessible 2.5 Rechargeable Battery 3. Durable 3.1 Strong Material 3.2 Sustainable motor 3.3 Battery Life
Hierarchal Customer Needs
Revised Problem Statement:
Our mission is to redesign an electric toothbrush so that it is sustainable and consumer friendly. According to the customer assessments, it is important that the toothbrush have a rechargeable battery and be somewhat lightweight. It is also important that the bristles be uniquely designed to be better at cleaning teeth and increasing dental hygiene. Our design will also aim to improve the grip, and to make it more ergonomic and user-friendly.
To aid our redesign process, we collected external research:◦History of electric toothbrushes on the market◦Cost of other products on the market◦Patented features already in existence
We completed benchmarking tables with information about features of other electric toothbrushes on the market:◦Battery life◦Noise level◦Bristle Design◦Grip
External Search
Feature OralB (our toothbrush) Crest Spinbrush Colgate Motion Phillips Sonicare
Battery life / Power 41 days – batteries 53 days - batteries 65 days - batteries Rechargeable battery
Noise level 70 dB 22.25 dB 86 dB Very loud (unknown specifics)
Bristle design Small oscillating circle Blue color signal bristles Small oscillating circle plus large brush
Larger brush head for whitening and removing plaque
Cost 16.99$ 14.90$ 6.99$ 99.95$
Grip/Comfort Blue rubber grip Varied color rubber grips Green rubber White and light blue plastic
Benchmarking Charts
Feature OralB (our toothbrush) Crest Spinbrush Colgate Motion Phillips Sonicare Category Weight
Battery life / Power 1 2 3 5 40%
Noise level 3 5 2 1 10%
Bristle design 2 3 4 5 35%
Cost 5 4 5 1 10%
Grip/Comfort 3 3 2 4 5%
Total score (weighted) 2.05 2.9 3.4 4.15
Rank 4 3 2 1
These charts helped us determine which features made other existing toothbrushes successful, and thus were used to help us with our concept generation.
Brush Head Design
Dual action head Outside spins clockwise, inside spins counter clockwise
Split head design
Inner circle of bristles oscillate
Intricate bristle design rotates clockwise
Inner and outside section oscillate independent of each other
Human Factors and Body Design
Grip has space on back for fingers
Grip design provides space for thumb and index finger
Toothbrush shape is wide in the middle and tapered at the ends
Finger grips on the side enhance ability to grip toothbrush
Basic electric toothbrush design with a curved grip and square bottom
Design similar to non-electric toothbrush, very skinny and easily fits in your hand
Energy Mechanisms for brush head
Conveyor belt system constantly spins head in one direction
Drive shaft system, the wheel on the bottom will rotate causing the brush head to spin
Motor with a piston that fires vertically causing the brush head to oscillate
Servomotor will spin the head and then return to its original position
Magnetic drive shaft, magnets will push and pull drive shaft connected to brush head
Pulley system will allow cables to twist brush head
Power Generation and Power Accessories
USB charger, plugs into outlet and bottom of toothbrush
Multiple battery packs that can be easily removed and put on charger
Charger that is powered by solar panel
Charger is connected to hamster wheel for unlimited power source
Charging station allows for storage and charging of battery
Charging basket provides a place to wirelessly charge toothbrush and store toothpaste
Morphological Chart
Morphological Chart
Morphological Chart
Concept Selection and Pugh Charts
Brush Head DesignIteration 1 Iteration 5
Sustainability Portability User-Friendly Sum Rank Sustainability Portability User-Friendly Sum Rank Weighting 0.262 0.126 0.611 Weighting 0.262 0.126 0.611
Concepts Concepts1- - - 0 6 1- 0 0 0 22- 1 0 0.126 5 2- 1 -1 -0.485 43- 0 1 0.611 2 3- -1 0 -0.126 34- 0 -1 -0.611 7 4- 1 -1 -0.485 45- -1 1 0.485 4 5- - - 0 26- 0 1 0.611 2 6- 0 1 0.611 17- -1 -1 -0.737 8 7- 0 -1 -0.611 58- 1 1 0.737 1 8- 0 -1 -0.611 6
Iteration 2 Iteration 6Concepts Concepts
1- 0 1 0.611 2 1- 0 0 0 22- - - 0 3 2- 1 -1 -0.485 33- -1 1 0.485 4 3- 0 0 0 24- 0 1 0.611 2 4- 1 -1 -0.485 35- 0 1 0.611 2 5- 0 1 0.611 16- 1 1 0.737 1 6- - - 0 27- 0 0 0 3 7- 1 -1 -0.485 38- 0 0 0 3 8- 1 -1 -0.485 3
Iteration 3 Iteration 7Concepts Concepts
1- 0 0 0 3 1- 0 1 0.611 22- 1 -1 -0.485 4 2- 0 0 0 43- - - 0 3 3- -1 1 0.485 34- 1 0 0.126 2 4- 0 1 0.611 25- 0 1 0.611 1 5- 1 1 0.737 16- 0 1 0.611 1 6- 1 1 0.737 17- 1 0 0.126 2 7- - - 0 48- 1 0 0.126 2 8- 0 0 0 4
Iteration 4 Iteration 8Concepts Concepts
1- -1 1 0.485 2 1- 0 1 0.611 22- 0 0 0 4 2- 0 0 0 43- -1 1 0.485 2 3- -1 1 0.485 34- - - 0 4 4- 0 1 0.611 25- -1 1 0.485 2 5- 1 1 0.737 16- 1 1 0.737 1 6- 1 1 0.737 17- 1 0 0.126 3 7- 0 0 0 48- 1 0 0.126 3 8- - - 0 4
Iteration 1 Iteration 5Sustainability Portability User-Friendly Sum Rank Sustainability Portability User-Friendly Sum Rank
Weighting 0.262 0.126 0.611 Weighting 0.262 0.126 0.611Concepts Concepts
1 - - - 0 4 1 1 1 -1 -0.2 32 1 -1 1 0.747 2 2 1 1 1 1 13 1 1 1 1 1 3 1 1 1 1 14 1 1 1 1 1 4 1 1 1 1 15 -1 -1 1 0.223 3 5 - - - 0 26 -1 -1 -1 -1 5 6 0 0 0 0 27 0 0 0 0 4 7 1 0 -1 -0.3 4
Iteration 2 Iteration 6Concepts Concepts
1 -1 1 -1 -0.747 3 1 1 1 1 1 12 - - - 0 2 2 1 1 1 1 13 0 0 0 0 2 3 1 1 1 1 14 1 1 1 1 1 4 1 1 1 1 15 -1 -1 -1 -1 4 5 0 0 0 0 26 -1 -1 -1 -1 4 6 - - - 0 27 -1 1 -1 -0.747 3 7 1 1 1 1 1
Iteration 3 Iteration 7Concepts Concepts
1 -1 -1 -1 -1 3 1 0 0 0 0 42 0 0 0 0 2 2 1 -1 1 0.75 23 - - - 0 2 3 1 1 1 1 14 1 1 1 1 1 4 1 1 1 1 15 -1 -1 -1 -1 3 5 -1 0 1 0.35 36 -1 -1 -1 -1 3 6 -1 -1 -1 -1 57 -1 -1 -1 -1 3 7 - - - 0 4
Iteration 4Concepts
1 -1 -1 -1 -1 22 -1 -1 -1 -1 23 -1 -1 -1 -1 24 - - - 0 15 -1 -1 -1 -1 26 -1 -1 -1 -1 27 -1 -1 -1 -1 2
Concept Selection and Pugh ChartsEnergy Mechanism for Brush Head
Iteration 1 Iteration 5
Sustainability Portability User-Friendly Sum Rank Sustainability Portability User-Friendly Sum Rank Weighting 0.262 0.126 0.611 Weighting 0.262 0.126 0.611
Concepts Concepts1- - - 0 4 1 -1 1 1 0.475 12 1 1 1 0.999 1 2 1 0 0 0.262 23 0 1 0 0.126 3 3 -1 1 1 0.475 14 0 -1 1 0.485 2 4 0 -1 -1 -0.737 55 1 -1 -1 -0.475 7 5- - - 0 36 -1 0 0 -0.262 6 6 -1 1 1 0.475 17 1 -1 -1 -0.475 7 7 1 -1 -1 -0.475 48 0 -1 0 -0.126 5 8 1 0 0 0.262 2
Iteration 2 Iteration 6Concepts Concepts
1 1 0 0 0.262 2 1 0 1 1 0.737 12- - - 0 4 2 1 -1 -1 -0.475 63 1 0 1 0.873 1 3 0 0 1 0.611 24 0 -1 -1 -0.737 7 4 0 -1 0 -0.126 55 1 -1 -1 -0.475 5 5 1 -1 -1 -0.475 66 0 0 0 0 4 6- - - 0 47 1 -1 -1 -0.475 5 7 1 -1 -1 -0.475 68 0 1 0 0.126 3 8 1 1 0 0.388 3
Iteration 3 Iteration 7Concepts Concepts
1 0 1 1 0.737 1 1 -1 1 1 0.475 12 0 0 1 0.611 2 2 -1 1 1 0.475 13- - - 0 5 3 -1 1 1 0.475 14 0 -1 0 -0.126 6 4 0 -1 -1 -0.737 55 1 -1 -1 0.475 3 5 1 -1 -1 -0.475 46 0 0 0 0 5 6 -1 1 1 0.475 17 1 -1 -1 0.475 3 7- - - 0 28 1 1 0 0.388 4 8 -1 1 0 -0.136 3
Iteration 4 Iteration 8Concepts Concepts
1 1 1 1 0.999 1 1 0 1 1 0.737 12 1 -1 1 0.747 2 2 1 0 0 0.262 23 0 1 1 0.737 3 3 1 0 0 0.262 24- - - 0 6 4 0 -1 -1 -0.737 65 1 -1 -1 0.475 4 5 1 -1 -1 -0.475 56 0 0 0 0 6 6 0 1 0 0.126 37 1 -1 -1 0.475 4 7 1 -1 -1 -0.475 58 1 1 0 0.388 5 8- - - 0 4
Power Generation
Iteration 1 Iteration 5
Sustainability Portability User-Friendly Sum Rank Sustainability Portability User-Friendly Sum Rank Weighting 0.262 0.126 0.611 Weighting 0.262 0.126 0.611
Concepts Concepts1- - - 0 4 1 1 1 1 1 12 1 1 1 1 1 2 1 1 1 1 13 1 -1 -1 -0.475 5 3 1 1 1 1 14 1 1 1 1 1 4 1 1 1 1 15 0 -1 -1 -0.737 6 5- - - 0 46 0 0 1 0.611 2 6 1 1 0 0.388 37 0 1 0 0.126 3 7 0 1 1 0.737 28 -1 -1 -1 -1 7 8 0 0 -1 -0.611 5
Iteration 2 Iteration 6Concepts Concepts
1 -1 -1 -1 -1 4 1 0 0 0 0 22- - - 0 2 2 1 1 1 1 13 1 -1 -1 -0.475 3 3 1 -1 -1 -0.475 34 1 1 1 1 1 4 1 1 1 1 15 -1 -1 -1 -1 4 5 -1 -1 -1 -1 46 -1 -1 -1 -1 4 6- - - 0 27 -1 -1 -1 -1 4 7 0 0 0 0 28 -1 -1 -1 -1 4 8 -1 -1 -1 -1 4
Iteration 3 Iteration 7Concepts Concepts
1 -1 1 1 0.475 2 1 0 -1 0 -0.126 42 -1 1 1 0.475 2 2 1 1 1 1 13- - - 0 3 3 1 0 0 0.262 24 1 1 1 1 1 4 1 1 1 1 15 -1 -1 -1 -1 4 5 -1 -1 -1 -1 66 -1 -1 -1 -1 4 6 0 0 0 0 37 -1 -1 -1 -1 4 7- - - 0 38 -1 -1 -1 -1 4 8 0 -1 -1 -0.737 5
Iteration 4 Iteration 8Concepts Concepts
1 -1 -1 -1 -1 4 1 1 1 1 1 12 -1 0 0 -0.262 2 2 1 1 1 1 13 0 -1 -1 -0.737 3 3 1 1 1 1 14- - - 0 1 4 1 1 1 1 15 -1 -1 -1 -1 4 5 0 0 0 0 36 -1 -1 -1 -1 4 6 1 1 1 1 17 -1 -1 -1 -1 4 7 0 1 1 0.737 28 -1 -1 -1 -1 4 8- - - 0 3
Body Design and Human Factors
Concept Selection and Pugh Charts
We averaged the rankings from each iteration to get the top ranked concept in each category to get our final design.
Concept Selection and Pugh Charts
• For the head we have an alternating rotation of the bristles. Outside bristles rotate in the opposite direction of the inside bristles.
• The body features an ergonomic handle built for comfort.
• It comes with a charging base that can be plugged into the wall.
• The toothbrush is powered by a servomotor which spins the head of the toothbrush.
Final Toothbrush Designand How it Works
Concluding Remarks