1. ELECTRIC TOOTHBRUSH DESIGN PROJECT Team 15: Mike Roemer John Shrefler Troy McCrum 10/7/2011

2. Project Outline Customer Needs Assessment and Revised Problem Statement Focus group opinions and individual interviews Organized hierarchy created with weighting (AHP) External Searching Patent search, benchmarking, and literature review Product Dissection Bill of materials, component separation Concept Generation Sketches, morphological chart Concept Selection Pugh charts Final Design

3. Project Management Customer Needs: Mike Roemer & Troy McCrum Benchmarking: John Shrefler Literature Review and Patent Search: Troy McCrum Bill of Materials: Mike Roemer Morphological and Pugh Charts: Mike Roemer Sketches: John Shrefler & Mike Roemer SolidWorks Models: John Shrefler

4. Customer Needs Chart 1. Portable 1.1 Light 1.2 Rechargeable F.1 Plug-in Dock C.1 No more than 6 -8 inches in length 2. User friendly 2.1 Durable F.2 Removable brush heads F.3 Rubberized Grip 2.2 Easy to use 2.3 Quiet 2.4 Safe F.4 Waterproof F.5 Small parts secured 2.5 Powerful F.6 Up to date brushing technology 2.6 Stylish 3. Flexible 3.1 Works for all ages 3.2 Fits all mouths 4. Durable 4.1 Easy Maintenance 4.2 Relatively maintenance free C.2 Retails under $20.00 Hierarchal Customer Needs List Obtained from Focus Group and Individual Interviews

5. External Search Activities Literature Review Patent Search Benchmarking Product Dissection Design Target FUNCTION ART Highly-Efficient Motor Same button turns toothbrush off and on Built into body Two separate brushes on head Recharges inside body of the toothbrush Low noiseUS 7356866 On/off Button US 5943723 Battery usability light US 5003250 Dual toothbrush US 3800350 Rechargeable battery US 4374354

6. Brush Head Concepts Top: standard bristle formation Bottom: Curved bristle formation Both: Rubber Drive Shaft Cover

7. Brush Head Concepts Large, rotating brush head Angled Bristles Dual-Rotation

8. Body Concepts On/off switch in one button Thicker body for better grip “Battery is low” light

9. Body Concepts Hook on back for hanging Longer Neck

10. Energy Mechanism Concepts Rotating Drive Shaft Vibration-Based Rubber coating on drive shaft to reduce noise

11. Power Generation Concepts Removable Battery Rechargeable Battery Built in (Plug in at bottom) Rechargeable Battery Built in (USB Plug-in)

12. Power Generation Concepts Rechargeable Battery Dock Rechargeable “Quick-swap” Packs (One sits in dock while other is used)

13. Morphological Chart Brush HeadBody / GripPower GenerationEnergy Mechanism Concept 1 standard bristle placement single on/off button on face of grip replaceable AA battery thin drive shaft that connects to rotating brush head to turn bristles Concept 2 360 degree-rotation headthick body for better grip built-in rechargeable battery that plugs in at bottom thicker drive shaft that delivers large vibrations Concept 3 large, rotating brush head"low battery" lightUSB capable rechargeable battery rubber-coated drive shaft to reduce noise Concept 4 vibration-powered angled bristles hanging hooks that snap on the back docking station for chargingnone Concept 5 2 small, rotating brush heads longer neck for more brushing leverage rechargeable "quick-swap" packs for charging none

14. Concept Selection: Pugh Charts Brush Head Concepts Durable (.2)Quiet (.42)Powerful (.12)TotalRank Standard bristle placement 00002 360-degree rotation 0 -0.324 Large, circular brush head 0110.541 Vibration-powered only 00002 2 small circular heads 1-0.55

15. Concept Selection: Pugh Charts Body & Grip Concepts Durable (.2)Ease of Use (.2)Weight (.35)TotalRank “low battery” and single on/off button 00001 Thicker body 1 -0.352 Hanging hooks 0 -0.553 Longer neck 0 -0.553

16. Concept Selection: Pugh Charts Power Generation Concepts Safe (.06)Weight (.35)Ease of Use (.2)TotalRank Replaceable AA battery 00002 Built-in rechargeable battery that plugs directly into wall 01-0.153 USB-rechargeable battery 00-0.25 Charge dock 1010.261 “quick-swap” packs 01-0.153

17. Concept Selection: Pugh Charts Energy Mechanism Concepts Durable (.2)Quiet (.42)Powerful (.12)TotalRank Thin drive shaft for less noise 00002 Thicker drive shaft for more vibration 01-0.33 Rubber-coated drive shaft to reduce noise 1100.621

18. Concept Selection: Pugh Charts Final Concepts Portable (.29) User Friendly (.61) Flexible (.1)Durable (.2)TotalRank Roemer (single AA battery, rotating head) 000002 Shrefler (rechargable battery, rotating head) 1010.521 Mccrum (built-in rechargable battery, oscillating head) 0 0-0.713

19. Final Design Single on/off function “Battery is Low” Light Rechargeable battery with small charging dock Rubber coating on drive shaft to reduce noise

20. Final Design (Drawings)

21. How It Works When toothbrush is turned on, the DC motor starts running. Power generated from the motor is converted by the driveshaft into a spinning brushing motion that is used to clean teeth. Rubber drive shaft cover eliminates clacking from the vibrations in the brush When battery life decreases to a certain point, battery light turns on, warning consumer that the brush is close to dying.

22. Closing Remarks We believe that our redesigned product has successfully addressed customer needs at a good cost. “Low Battery” light, a single on/off button, and the drive shaft cover were all accomplished objectives from our revised problem statement Overall, our product is an effective electric toothbrush that is reasonably priced, convenient to consumers and travel- friendly.