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:
Mar. 22, 2011
Filed:
Dec. 20, 2007
Ayumu Morita, Hitachi, JP;
Minoru Hosoda, Hitachinaka, JP;
Yoshihiko Matsuda, Hitachiota, JP;
Masato Suzuki, Hitachi, JP;
Keiichi Miyashita, Hitachi, JP;
Shigetoshi Oouchi, Hitachi, JP;
Masaaki Saitou, Hitachi, JP;
Akihito Yano, Hitachiota, JP;
Ayumu Morita, Hitachi, JP;
Minoru Hosoda, Hitachinaka, JP;
Yoshihiko Matsuda, Hitachiota, JP;
Masato Suzuki, Hitachi, JP;
Keiichi Miyashita, Hitachi, JP;
Shigetoshi Oouchi, Hitachi, JP;
Masaaki Saitou, Hitachi, JP;
Akihito Yano, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A circuit breaker includes a vacuum valve, an electromagnet including a first coil for driving an operating shaft of the vacuum valve toward an opening direction by electromagnetic repulsion, a movable core and a permanent magnet. Further, an operating mechanism is provided which excites the first coil to close the vacuum valve, holds the vacuum valve closed by an attractive force of the permanent magnet and excites the first coil in a direction reverse to an excitation direction in closing operation to open the vacuum valve. In the circuit breaker, together with the first coil, a second coil is disposed which is excited simultaneously with an electromagnetic repulsion coil for a quick opening operation by electromagnetic repulsion is provided in the electromagnet.