| 摘要 |
PURPOSE:To eliminate the necessity for a sealing process at sealing of oil in a cylinder of a dashpot and simplify its construction, by building only a plunger in the cylinder and providing a return spring externally of the cylinder. CONSTITUTION:A hole is provided in an arm part 12 of an L-shaped yoke 11, and a cylinder 13 is fixed to said hole. Then magnetic fluid 14 is housed in a groove formed in an internal wall of the cylinder 13, further a plunger 24 is housed in the cylinder 13 simultaneously an opening of the cylinder 13 is sealed by a cylinder head 15. while a coil 16 is provided in the periphery of the cylinder 13. Further a supporting element 21 of an L-shaped armature 18 is pivotally mounted to a supporting part 17 of the yoke 11 by a pivot 22, and a return spring 25 is mounted to the yoke 11 and an end part of the armature 18. Further a permanent magnet 23 is mounted to the periphery of the cylinder 13 in the vicinity of the magnetic fluid 14. In this way, only the plunger 24 is arranged internally of the cylinder 13, and an expected object can be attained. |
