Travel Brush Design Report

Team #5Steven Aloia

Eric VanArsdale

Kory Barnoff

7 October 2011

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 Generation

Concept Selection

Final Design•Deign Drawings•Parts list •Bill of materials

•Testing (How does it work?)

Conclusions

Citation of References Used

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

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.

External Search Summary

External

Search

Literature Review

Patent Search

Benchmarking

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

Concept Generation Power Generation and Power Accessories

Concept 1:  Rechargeable flat lithium batteries built in USB for power recharge

Concept 2: AAA Battery design

Concept 3: Detachable battery pack

Concept 4: Single AA Battery

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

Concept GenerationBrush 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

Concept Generation Human Factors Body Design

Concept 1: Rubber grip with natural fit

Concept 2: Naturally placed on-and-off button

Concept 3: Collapsible design

Concept 4: Portable size

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 design Offset 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 Battery Spider gear translation

Spinning part and up-and-down part

combination

Portable size

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

Pugh Charts Power Generation and Power Accessories

The best option according to the Pugh charts is the USB rechargeable

toothbrush

Pugh ChartsEnergy Mechanism for Brush

Head

Based upon the energy mechanism Pugh Charts, the best option is

concept 4.

Pugh ChartsBrush Head Design

The best option from the brush head design Pugh charts is combination of the spinning head and up-and-down head.

Pugh ChartsHuman 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.

Sketch and Details of Final Design

Sketch of Final Design CAD Drawing

Technological Description

• Power supply through USB cable

• 4 flat rechargeable batteries insure a long life between charges

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/MechanicalSystems/GearsGen.php

http://www.progressiveautomotive.com/Copy%20of%20Double%20U%20Joint%20Steel.jpg

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