| 摘要 |
PURPOSE:To prolong the life for opening and closing by providing a braking member which increase the braking force to a driving member following the displacement operation of the driving member to the opening direction of a contact. CONSTITUTION:A compression coil spring (a braking member) 23 to increase the braking force to an iron core 20 as the dispacement amount of a driving member BB (the movable iron core 20 precisely) to the contact opening direction is increased, when the contact part of a seal contact AA is opened, is provided. As a result, the opening force of the contact is not reduced too much to the level to give an influence to the extinction of arc, and the restoring operation speed of the iron core 20 when the iron core 20 is restored a specific distance and reaches to a regulating position, that is, a part of a housing 24, is braked and reduced by the spring 23. Consequently, the shock of the collision at that time is moderated, an impact force transmitted to a bellows connected to a movable shaft 12 driven by a driving pin 20a fixed to the iron core 20 through an intermediate movable member 25 is also weakened, and the bellows is never hurt, so as to extend the opening and closing life. |
