| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensive device of high safety and excellent durability for automatically reducing soil on a reflecting material provided at a columnar marker with the reflecting material without manual operation even if wind force is weak. <P>SOLUTION: An automatic cleaning device comprises annular squeegees inserted around the columnar marker with the reflecting material and vertically moved by the wind force to scrape away dust on the reflecting material, and fall preventing stoppers provided with inclined faces for guiding the wind to the annular squeegees from below. <P>COPYRIGHT: (C)2010,JPO&INPIT |
