| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that there is possibility of a wheelchair falling with conventional wheels where there are many irregularities, small step differences or grooves on a road surface and it is hard to get on in the case of the step differences, it requires large labor, it is hard to travel in safety and there are inconveniences and risks when the wheelchair travels not indoor but in a city area. SOLUTION: An air ball is installed as a cushioning effect by using a caterpillar chain a part to finish getting on the step difference after making contact with it after immediately before making contact with it of which has the most suitable large circular arc and a ball caterpillar of which is small in a circular arc for returning as a wheel having a large circle diameter is favorable but inconvenient in use. Additionally, the wheelchair never falls in a vertical groove in the forwarding direction with the ball caterpillars installed in right and left two rows. COPYRIGHT: (C)2009,JPO&INPIT
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