| 摘要 |
PROBLEM TO BE SOLVED: To prevent a scraper, removing soil on an inner peripheral surface of a crawler belt of a crawler type traveling device to a side part, from becoming resistance during work. SOLUTION: The scraper 63 can move between a use position removing the soil on the inner peripheral surface 14a of the crawler belt to the side part, and a retract position retracting from the use position. COPYRIGHT: (C)2009,JPO&INPIT
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