Buffering device for the operating mechanism of a switchgear, and method of lubrication thereof
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United States of America Patent
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Sep 30, 2014
Grant Date -
Sep 27, 2012
app pub date -
Oct 7, 2010
filing date -
Oct 9, 2009
priority date (Note) -
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Abstract
A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.
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