| 摘要 |
PROBLEM TO BE SOLVED: To solve problems in a conventional cargo transportation vehicle for stairs such that a load applied on an operation handle fluctuates when the vehicle goes up and down stairs and causes a burden on a person gripping the operation handle. SOLUTION: A lifting sensor 5 senses a difference in steps, a lifting arm 6 is turned by its signal, and a tread F of stairs K is pressed by its tip part to float a rear end part of a vehicle body 1 to move a running wheel 3 by one step. A front end part of the vehicle body 1 is moved by rotating an arm member 8b using a small wheel 8a in contact with the tread F as a fulcrum to move the small wheel 8a of other adjacent arm member 8b by one step in accordance with the travel of the running wheel 3.
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