| 摘要 |
<p>PURPOSE:To allow a hauler to travel on a staircase or a rough terrain having a step difference when transporting persons and freights in a factory, building, hospital, etc. CONSTITUTION:As for wheels 3, 4, 5 and 6, a coil spring 9 is wound in ring form onto a ring body 7 so that the center axis is set along the outer periphery of the ring body 7, and each loop 12 of the coil spring 9 is supported so as to turn around a hole 8 opened on the ring body 7.</p> |
