| 摘要 |
PROBLEM TO BE SOLVED: To provide a hang type free movement device in which falling off from a running surface is prevented even if load more than magnetic absorption force is applied. SOLUTION: A chassis 2 having a ferromagnetic body which is mounted on, for example, the under surface of a ceiling 1 by magnetic suction force to run has rotatably a magnetic circuit device 3 for generating magnetic suction force and a shaft 7. The one end of a wire 10 is combined with the shaft. A constant force spring device containing a constant force spring 5 and a main drum 8, or the like, is mounted between the shaft and the chassis. The constant force spring device is used to wind a wire round the shaft and to apply constant force to the wire. |
