Hang Tight

1. Rishi Savaliya, Mitch Reid, Kelsey Barrera Hang Tight

2. Define the Problem Time Management Survey Brainstorming Research Donation Letters Existing Solutions Group Solutions Selecting an Approach First Prototype Second Prototype Agenda • 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. Define the problem

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

5. Gantt chart

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

7. Age groups: • 14 and under • 15 to 25 • Ride bikes on average of 1 to 5 times weekly Survey data – Target market information

8. Survey data – causes for faulty chains

9. Survey data – Problem justification

10. Survey data – product pricing

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 brainstorming

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 research

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 Donation letter

14. Drive-shaft driven bicycle • Eliminates chain Existing solutions Patent 5078416

15. Chain catcher for bicycles • Does not prevent chain from falling Existing solutions Patent 5184984

16. Motorized bike with gear and chain cover Existing solutions Patent 6591929

17. Design 1 Group solutions

18. Design 2 Group solutions

19. Design 3 Group solutions

20. Design 4 Group solutions

21. Easy to use Aesthetics Functionality Material Cost Feasibility Adaptability Criteria and constraints

22. Select an approach

23. Created a build process Completed material and cost analysis Created technical drawings for concept Develop a design proposal

24. Foam First prototype

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

26. Design 5 New design

27. Design matrix

28. Material selection matrix

29. Wood Second prototype

30. Bill of Materials – Second Prototype

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 Test procedures

32. Wooden prototype passed all tests Test result and evaluation

33. Lots of broken parts Very close to wheel Very close to pedal Second prototype – Problems

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

35. ABS Plastic Third prototype

36. Prototype with bike Third Prototype

37. Bill of Materials – Third Prototype

38. Duration test completed • Passed • Chain alignment test completed • Passed • Other tests still to be determined Test result and evaluation

39. Plastic is layered • Easier to break Third prototype – problem

40. New material • Steel • Aluminum • New elastic • Design is still the same refinements

41. Final product

42. Summary

43. Questions?

44. Thank you