AbstractCycling is closed connected with human’s life
In 1791 , the French West Flachi Grams invented the primitive bike, it had no gearing but only two wheels, People riding on it, need two pedals to drive the roll-forward
With the innovation and improvement of science , the bicycle nowadays has developed from a large volume into a folding one , moreover, it has started to gradually increase the ancillary functions
Cycling is no longer a simple means of transport , the addition of the ancillary functions can solve some problems that people encounter when out
With the enhancement of today's living requirements, the subsidiary functions are extended on an innovative breakthrough in bicycle design
Key Words:Folding bike, Accessory function, Extensions design引 言在生活质量日益提高的经济形势下,产品的技术创