1. Travel Brush Design Report Team #5 Steven Aloia Eric VanArsdale Kory Barnoff 7 October 2011

2. Design Sequence Introduction Initial problem statement Customer Needs Assessment Weighting of customer needs Revised Problem Statement External Search Literature Review Patent Search Benchmarking Product dissection Concept GenerationConcept Selection Final Design Deign Drawings Parts list Bill of materials Testing (How does it work?) Conclusions Citation of References Used

3. Project Management Project Initiation Design Objective Project Goals Project Planning Project Direction Work Plan Brainstorm Ideas Time frame Design strategy Project Managing Status tracking Group member assignments Design goal management Project Closeout Project acceptance Post review Completion report Design testing Outcome assessment

4. Hierarchal Needs Chart 1. Portable (0.42, 0.42) C1. Compact 1.2 Easily stored and packed (1.47, 0.35) 1.3 Rechargeable battery (0.12, 0.29) 1.4 Light weight (0.10, 0.24) 1.5 Collapsible (0.08, 0.18) F1. Universal USB charging 2. User friendly (0.17, 0.17) C2. Long battery life 2.2 Comfortable (0.02, 0.13) 2.3 Appealing exterior (0.03, 0.18) 2.4 Quiet (0.03, 0.18) 2.5 Ease of operation (0.02, 0.13) 2.6 Large brush surface (0.01,0.02) 2.7 Pressure sensor (0.01, 0.07) 3. Versatility (0.25, 0.25) 3.1 Changeable bristle type (0.08, 0.33) 3.2 Disposable heads (0.11, 0.44) 3.3 Adjustable brush head angle (0.06, 0.22) 4. Reliability (0.17, 0.17) 4.1 Long lasting product (0.10, 0.60) C3. Waterproof 4.3 Self-cleaning (0.07, 0.40) Revised Problem Statement After weighing all the customer needs, the desired electric toothbrush model needs to be above all portable, then versatile, then user friendly, and lastly reliable. These needs reflect the customer’s desire for a travel electric toothbrush, not an advanced home toothbrush.

5. External Search Summary External Search Literature Review Patent SearchBenchmarking Product Dissection Literature Review Article pertaining to USB charging port for toothbrush charging(Adrain August 12, 2011) Advertisement for international plug adapters for USB plugs Patent Search Rechargeable : US 7,570,018 USB port: US 2007/ 0094822 Large Battery: US 2003/ 0041396 Detachable head: US 2007/0094822 Benchmarking Tooth Brushes Used in benchmark comparison: Braun Battery Powered Travel Crest Spinbrush Precision Clean Oral-B Rechargeable Colgate Motion Compared the size, aesthetics, ease of clean, convenience, price, cleaning power, and charging ability of each brush. Product Dissection Noise Measurement Power Measurement Brush Dissection Battery Life Measurement

6. Concept Generation Power Generation and Power Accessories Concept 1: Rechargeable flat lithium batteries built in USB for power recharge Concept 2: AAA Battery designConcept 3: Detachable battery packConcept 4: Single AA Battery

7. Concept Generation Energy Mechanism for Brush Head Concept 1: Offset weight in head for high frequency vibration Concept 2: Offset cam for up- and-down motion of head Concept 3: Direct motor head connection Concept 4: Spider gear translation

8. Concept Generation Brush Head Design Concept 1: Ball-and-socket head swivel Concept 2: Up-and-down motion brush head Concept 3: Multiple detachable heads Concept 4: Spinning part and up-and-down part combination

9. Concept Generation Human Factors Body Design Concept 1: Rubber grip with natural fit Concept 2: Naturally placed on- and-off button Concept 3: Collapsible designConcept 4: Portable size

10. Morphological Chart Label In Category Power Generation and Accessories Energy Mechanism for Brush Head Brush Head Design Human Factors body design Concept 1 Rechargeable flat lithium batteries built in USB for power recharge Offset weight in head for high frequency vibration Ball-and-socket head swivel Rubber grip with natural fit Concept 2 AAA Battery designOffset cam for up- and-down motion of head Up-and-down motion brush head Naturally placed on- and-off button Concept 3 Detachable battery pack Direct motor head connection Multiple detachable heads Collapsible design Concept 4 Single AA BatterySpider gear translation Spinning part and up- and-down part combination Portable size

11. Criteria for Concept Selection Design should be light weight and travel friendly Portable Easy to program and operate User Friendly Changeable brush heads, user adjustable Versatile Long lasting and durable Reliable

12. Pugh Charts Power Generation and Power Accessories The best option according to the Pugh charts is the USB rechargeable toothbrush

13. Pugh Charts Energy Mechanism for Brush Head Based upon the energy mechanism Pugh Charts, the best option is concept 4.

14. Pugh Charts Brush Head Design The best option from the brush head design Pugh charts is combination of the spinning head and up-and-down head.

15. Pugh Charts Human Factors Body Design The Pugh charts for the human factors section of the concept selection are the hardest to read. However, given the data from the charts, we have decided that all the concepts except concept 3 can be combined with no loss in any area.

16. Sketch and Details of Final Design Sketch of Final DesignCAD Drawing

17. Technological Description Power supply through USB cable 4 flat rechargeable batteries insure a long life between charges

18. Technical Description Power transfer via rotating drive shaft from motor Transferred through ball joint with a universal joint Rotation is transferred 90 degrees with spider gears A pin from the rear and outer edge of the gear hits lobes on the brush head creating brush motion http://www.daerospace.com/Mechanical Systems/GearsGen.php http://www.progressiveautomoti ve.com/Copy%20of%20Double%20 U%20Joint%20Steel.jpg

19. Concluding Remarks Common USB jack for recharging with a computer or wall outlet adapter Never hassle finding the correct batteries Ball joint allows perfect brushing angle for maximum brush-tooth contact Tried and true rubber grip and thumb located power switch add comfort and ease of use