Altshuller Institute for TRIZ Studies Outline of Talk TRIZCON2009 We are going to report a case study of applying USIT USIT Case Study: to a familiar problem of improving bicycles A Mom’s Bicycle by a group of participants at a USIT 2-Day Training Seminar. for Safely Carrying Two Children The outputs of group practice were documented and later refined via email discussions. Hiroshi Sakata (Hitachi Research Lab.), Tetsuya Sudo (Sekisui House), The whole process is presented here along the USIT process: Keiichi Hasegawa (Bridgestone), Problem definition, Katsura Hino and Akira Kato (Kokuyo Furniture), and Problem analysis of the present system and the ideal system, Toru Nakagawa (Osaka Gakuin Univ.) Solution generation. Mar. 16-18, 2009 Some discussions are given in comparison with other solutions. Hilton Woodland Hills, CA, USA Aims of the Present Paper: Mothers with two children on bicycles. For learning problem solving methodologies, such as TRIZ and USIT, learning the way of thinking is important but difficult. But all these mothers are violating Road Traffic Law There are various ways of learning: in Japan!! Reading textbooks, Listening lectures and seminars, On a bicycle, only one child Training practices, Solving real problems, etc. is allowed to carry. Case study reports are very useful to learn TV news (NHK, Mar. 4, 2008): if the actual ways of thinking in the problem solving are "The National Police Agency has suggested recently, described in a vivid way traceable by the readers, on the strong requests from mothers, to modify the law to allow to carry two children on a bicycle and are discussed objectively on critical issues. if bicycles are improved to do so safely." This paper intends to be such a Case Study report On Mar. 7-8, 2008, at a USIT Training Seminar, of applying USIT to a familiar real problem we tried to propose solutions to this problem using USIT. in a recent 2-Day USIT Training Seminar.
Problem Solving with USIT in 2-Day Training Seminar USIT 2-Day Training Seminar Session Problem Mar. 7-8, 2008, Tokyo. Instructor: Toru Nakagawa Define the Problem in a Well-defined Form [1] Definition Open-entry multi-company situation. Understand the Present System: Group practices for solving 3 real problems in parallel. Problem [2] Functional Analysis, Attribute Analysis Analysis Space and Time Characteristics Analysis Understand the Ideal System: [3] Desirable Actions and Properties Idea Generation: [4] Solution Write down generated ideas freely. Generation [5] Explore the Solution Space Systematically Evaluate Ideas Quickly and [6] After Build Up Conceptual Solutions USIT ( Implement into Real Solutions ) ( Implementation) [Session 1] Problem Definition Agenda of USIT 2-Day Training Seminar Sharing the Problem: Photo of the original record in Japanese 9:00 10:00 (L0) Introduction (L4) Analysis of Ideal System (L1) Introduction to Group Work (3) TRIZ/USIT 12:30 P & D Lunch 11:15 13:30 (L5) Solution Generation 12:00 Presentation of Problems Lunch 13:00 (L2) Problem Definition Group Work (4) 14:45 P & D 14:30 Group Work (1) Group Work (5) Presentation & Discussions 16:30 P & D 16:15 16:45 (L3) Analysis of Present System Group Work (6) Group Work (2) P & D 17:30 (L6) Promotion in Industries P & D General Discussion 18 ： 00 19:00
Problem Definition Sharing the Problem and Examining the Scope 5 items with are requested by USIT ★ Unwanted effect (later redrawn in a Mind Map in English) Unsteady Stop and lean to one Fall over due to handling at low (A) side insufficient leg speed (Jam the feet to the support ground) Be injured Separate theme (B) The child falls from the seat when getting on/off the bike. ⇒ We have chosen the problem (A) more significant. ★ Problem definition statement : The design should enable steady riding at low speed, easy supporting with legs when stopping and leaning to one side, and preventing from falling over. ★ Sketch : Next slide When a bicycle stops, it falls over without a support. ★ Root cause : ★ Minimal set of related objects Ground, wheels, bicycle components, parent, child A, and child B [Session 2] Understanding the Present System (Brushed up later) Sketch of the Present System Time-Characteristics Analysis (Brushed up later) The child seat is Shallow handlebar fixed to the Parent handlebar High center of Swerving gravity position Pedaling When suddenly Child B braking Child A When Unsteady and apt to fall over Stopping The center of gravity starting off Easy to slip (Jam the feet position is separated to the Slowly Taking Suddenly from the handlebar axis Turning ground) accelerating braking child B off Putting When the bike child B on Reaching the When the bike stopping peak of a Engaging getting Front and back slope the Riding the kickstand wheels are the Accelerating off bike Accelerating same size When Easy to slip High center of (rider) down a slope gravity Narrow space mounting Getting off Brake position to move the the bike decelerating Decelerating Stable riding (rider) legs Putting up a slope Taking child A on child A off the bike Stable riding Disengaging the bike Stable riding the Stable riding kickstand ⇒ There are 5 dangerous situations, namely, when mounting, starting off, suddenly braking, stopping, and getting off. Stopping Time
Refined after the Seminar. This diagram was refined Attribute Analysis Functional Analysis after the seminar. Reveal any attribute which is relevant to the unwanted effect. Draw the intention of the current design (i.e. useful functions) (Increasing relationship) (Decreasing relationship) Child A Parent Child B Unwanted effect Support Support Support Maniulate Child seat Attribute of object Attribute of object the direction • Weight of 2 children Support • Length of wheelbase Give Saddle Child seat diving force • Distance between handlebar axis and • Grip force of wheel Handlebar Support child's center of gravity Support Unsteady • Friction with ground Support Transmit Hold at low speed • Weight of bicycle • Height of child's center of allowing rotation Fork Frame • Size of back wheel gravity • Size of front wheel • Height of bicycle's center of Transmit Support Support Set the direction driving power • Bumpiness of ground gravity Front wheel Pedal Back wheel Reciprocal relationship? Height of child's ⇒ Weigh the advantages and Difficult to support Push Support, transmit center of gravity disadvantages . Support when stopping and Set the direction back reaction power ⇒ Sure enough, a low center leaning to one side Height of bicycle's of gravity is center of gravity Ground advantageous! Space Characteristic Analysis Drawn after the Seminar. [Session 3] Understanding the Ideal System Front view has revealed the effect of the position (height) of the children. USIT requests to 'Draw an image of the Ideal System Original without drawing any means for achieving it.' drawings The bike frame is The bike frame is leaning to one side and straight up the parent is supporting the weight on one leg. Parent Child Difficult to Easy to support with the support with leg and need to the leg. step outside. When stopping and leaning When stopping and leaning When riding normally to one side, low position to one side, high position
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