| 摘要 |
PROBLEM TO BE SOLVED: To propel a bicycle by rotating a chain by force pressed by both legs since the force is weak only by one leg and a person is easily tired although a conventional bicycle is propelled by rotating a pedal by force descended by one leg. SOLUTION: The pedal of the bicycle is changed to dual-leg pedal pressing type one. A helical shaft is rotated as shown in Fig. 2 and a chain receiving gear is rotated by cooperation of gears 1, 2, 3 to advance the bicycle. COPYRIGHT: (C)2007,JPO&INPIT |
