The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2012
Filed:
Nov. 12, 2009
Ayumu Morita, Hitachi, JP;
Takashi Sato, Mito, JP;
Tomoaki Utsumi, Hitachi, JP;
Makoto Yano, Mito, JP;
Kenji Tsuchiya, Hitachi, JP;
Masato Kobayashi, Hitachi, JP;
Shuichi Kikukawa, Hitachi, JP;
Junichi Katagiri, Naka, JP;
Ayumu Morita, Hitachi, JP;
Takashi Sato, Mito, JP;
Tomoaki Utsumi, Hitachi, JP;
Makoto Yano, Mito, JP;
Kenji Tsuchiya, Hitachi, JP;
Masato Kobayashi, Hitachi, JP;
Shuichi Kikukawa, Hitachi, JP;
Junichi Katagiri, Naka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A vacuum switchgear has a vacuum valve including a movable conductor connected to an insulating rod, and a fixed conductor connected to a bus bar or to a load cable, a vacuum chamber encasing the vacuum valve, an insulating envelope covering the vacuum chamber, the outer surface thereof being covered with an electro-conductive layer thereby to earth the envelope, and an insulating lid gas-tightly fitted to the insulating envelope. The lid has an insulating bushing through which an insulating rod penetrates, the insulating rod being connected to an operating mechanism, wherein the insulating rod except a portion exposed from the bushing is gas-tightly confined in insulating gas atmosphere formed between the insulating envelope and the insulating lid.