| 摘要 |
PROBLEM TO BE SOLVED: To provide a carrier capable of easily moving on the stairs and steps. SOLUTION: A plurality of rollers are arrayed in a row with an axial angleθ. At this time, the rollers adjacent to each other are arrayed such that both end parts thereof are stacked in the vertical directions of roller arraying columns 6 and 7. Further, another plurality of rollers are arrayed in a row in a direction opposite that of the axial angleθ. These two roller arraying columns 6 and 7 are maid a pair and attached to the bottom part of a carrier. When the carrier is moved on the stairs or the steps, the plurality of rollers are moved on the corners of the steps sequentially and thus smooth stepping- over movement is performed.
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