| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the size of a grounding switch by providing a fitting frame, which houses a grounding blade in slits at a nongrounding time, causing the fitting frame to function as a shield and reducing the distance between the grounding blade and a charging part. SOLUTION: With the use of sticking boards 54a, three pairs of through- terminals 54 required for three phases are fixed with a fitting board 47 put into hermetically. To the tip of each through-terminal 54, one end of a grounding blade 55 is fitted rotatable. Then the grounding blade 55 is put in the slits 48a, 48b of a fitting frame 48. Under a non-grounded condition where the grounding blade 55 is separated from stationary contacts 50a, 51a, the grounding blade 55 is put into the slit 48b, and does not protrude from the surface of the fitting frame 48. If a drive shaft 59 is rotated in an anticlockwise direction by operating a final control element 58, six grounding blade 55 rotate toward the outsides, and their tips fit into the cutouts of the stationary contacts 50a, 51a. Then, upper and lower conductors 50, 51 are grounded via the grounding blade 55 and via terminals 54.</p> |
