| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum valve changeover switch where the device as a whole can be greatly downsized by downsizing a resistor by shortening the difference in current flow time. SOLUTION: In the vacuum valve changeover switch where a vacuum valve operation mechanism is activated by controlling the rotational speed of a driving shaft by a speed control device provided to an energy storing mechanism and having the entire torque that is transmitted to the driving shaft from an operation mechanism when a tap is changed-over to an even number side is made to be; decrease speed, minute increase of speed and then decrease speed and a piston is plunged into the even number side cylinder in a speed control device, the even number side cylinder has a first orifice formed in a cylinder tube in a state so that the entire torque in the first decrease in speed range is communicated with the outside and closed after the minute increase in speed range. Then, a path is provided on the outside of the tube and a relay orifice and a second orifice are provided for the tube, the piston is provided with an eject groove in one end and the second orifice and the eject groove are not communicated up to the minute increase in speed range of the entire torque and communicated with the outside continuously through the last speed decreasing range.
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