1. Rishi Savaliya, Mitch Reid, Kelsey Barrera

2.  Define the Problem  Time Management  Survey  Brainstorming  Research  Donation Letters  Existing Solutions  Group Solutions  Selecting an Approach  First Prototype  Second Prototype  Third Prototype  Test Procedures  Test Results and Evaluation  Refinements

3. Problem Statlement According to the US Department of Transportation’s National Highway Traffic Safety Administration (NHTSA), approximately 57 million people in the United States rode a bicycle in the year 2002. The first bicycle that used a chain was invented in 1885. This resulted in the problem of bicycle chains falling off the gears. In a class of 27 students, 20 agree that bicycle chains falling is a problem that occurs very often and should be solved.

4. Statement of Purpose Create a product that will prevent the chain from falling off the gear of a bicycle.

6.  Survey population: 145  Goals of conducting our survey  Target Market Information  Multiple causes of falling bicycle chains  Problem Justification  Product Pricing

7.  Age groups:  14 and under  15 to 25  Ride bikes on average of 1 to 5 times weekly

11.  Determine what specifically causes chains to fall off  Create possible designs  No restraints  All ideas welcome  Build off of team member’s ideas for best preliminary design

12.  Why do bike chains fall off?  Decreased tension makes chain loose  Misalignment of chain and sprocket  Does not mean that bike can not be used

13.  Explained reason for writing  Asked bike manufacturers to donate bikes  Schwinn  Mongoose/Pacific Cycle  Trek Bicycle  Raleigh America Inc.  Cannondale Bicycle Corp.  Benefits to companies for contributions

14.  Drive-shaft driven bicycle  Eliminates chain Patent 5078416

15.  Chain catcher for bicycles  Does not prevent chain from falling Patent 5184984

16.  Motorized bike with gear and chain cover Patent 6591929

17.  Design 1

18.  Design 2

19.  Design 3

20.  Design 4

21.  Easy to use  Aesthetics  Functionality  Material  Cost  Feasibility  Adaptability

22. ConstraintWeightDesign 1Design 2Design 3Design 4 Ease of Use51525 Aesthetics21534 Functionality52444 Material31123 Cost41123 Feasibility31143 Adaptability41115 Total-316966103

23.  Created a build process  Completed material and cost analysis  Created technical drawings for concept

24.  Foam

25.  Too large for bike  Wheels on prototype don’t align  Not a good material  Very hard to construct  Arms too far from base

26.  Design 5

27. ConstraintWeightDesign 1Design 2Design 3Design 4Design 5 Ease of Use515255 Aesthetics215345 Functionality524445 Material311234 Cost411234 Feasibility311435 Adaptability411155 Total-316966103123

28. SpecificationWoodPlasticSteelCardboardFoamAluminum Durability345215 Cost531551 Machinability552552 Availability553543 Aesthetics455115 Total22 161816

29.  Wood

30. ItemQuantitySpecificationsPrice Wood12" X 4" X 2'$ 1.98 Screws with Bolts2 packs of 31/4" 20$ 1.49 per pack Rubber BandsA ball of them Multiple sizes and strengthsAlready Owned Total--$ 4.90

31.  Chain Alignment  Chain must stay aligned with prototype wheels  Drop Test  See effect of various riding terrains on prototype  Durability Test  Chain stays aligned for a given period of time  Rider Interference  Prototype cannot prevent rider from pedaling properly

32.  Wooden prototype passed all tests

33.  Lots of broken parts  Very close to wheel  Very close to pedal

34.  Redo dimensions  Arm  Wheel  Base  Create new piece  Attachment Piece  New Material  ABS Plastic

35.  ABS Plastic

36.  Prototype with bike

37. ItemQuantitySpecificationsPrice Screws and Bolts2 packs of 31/4" 20$1.49 per pack Rubber BandsA ball of them Multiple sizes and strengthsPre-owned PlasticABS Plastic Total--

38.  Duration test completed  Passed  Chain alignment test completed  Passed  Other tests still to be determined

39.  Plastic is layered  Easier to break

40.  New material  Steel  Aluminum  New elastic  Design is still the same