| 摘要 |
PROBLEM TO BE SOLVED: To provide a traveling truck of magnetic attraction type capable of stably running on the measurement object, even the surface of which is rusted. SOLUTION: The travelling truck of magnetic attraction type provided with a plurality of wheels 10 which generate magnetic force for running on the surface of a magnetic substance (large diameter steel pipe 100) while attracting the surface of a magnetic substance. The nonmagnetic caterpillars (belts 90) which are covering over the treads of plurality of wheels 10 are provided, and the scrapers 92 are also provided at places apart from the wheels 10. COPYRIGHT: (C)2007,JPO&INPIT
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