| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum switching device reduced in required operation force in closing it by reducing load variation of the operation force. SOLUTION: This vacuum switching device is equipped with an insulation lever supported to an insulation mold frame, connected to a moving electrode of a vacuum valve at one end, and connectable to an operation mechanism at the other end; a contact pressure spring is installed between the insulation lever and the moving electrode to provide contact pressure; a release spring is installed between the moving electrode and the vacuum valve to keep the moving electrode opened; and spring action force of the release spring provided for the moving electrode is set smaller than that of the contact pressure spring. The release spring is so structured as to be extended and contracted only between opening dimensions, and closing operation force after contact touch in closing can be reduced. COPYRIGHT: (C)2005,JPO&NCIPI
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