| 摘要 |
PURPOSE:To speed up the movement of a plunger by exerting a load force to the plunger by the use of a permanent magnet fitted. CONSTITUTION:A plunger 3, freely and vertically movable, is set in the center of a coil 2 wound in a yoke 1, and a plunger rod 4, united to the plunger 3 and protruded from the yoke upwards, is coupled with some device such as a breaker. A permanent magnet 5, attached to the lower end plane of the plunger 3, is attracted to the magnetic stopper 6 at the starting position of the plunger 3 so that a load force due to the attracting force of the magnet 5 is exerted to the plunger 3. |
