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:
Jan. 20, 2015
Filed:
Jun. 14, 2011
Kenji Suzuki, Kounosu, JP;
Yasuhiro Naka, Kounosu, JP;
Kouetsu Takaya, Kounosu, JP;
Yuji Shiba, Kounosu, JP;
Yuichi Yamamoto, Kounosu, JP;
Kenji Suzuki, Kounosu, JP;
Yasuhiro Naka, Kounosu, JP;
Kouetsu Takaya, Kounosu, JP;
Yuji Shiba, Kounosu, JP;
Yuichi Yamamoto, Kounosu, JP;
Fuji Electric Co., Ltd., Kawasaki-shi, Kanagawa, JP;
Abstract
An electromagnetic switch has a contact device having a pair of fixed contacts fixed inside an arc extinguishing chamber housing and a movable contact disposed to contact with and separate from the fixed contacts; and an electromagnetic device having a movable plunger moving between an opened position wherein the movable contact separates from the fixed contacts and a closed position wherein the movable contact contacts with the fixed contacts and pressed down. The arc extinguishing chamber housing is provided with permanent magnets to extinguish an arc generated at an opening time when the movable contact separates from the fixed contacts from a state in the closed position wherein the movable contact is contacting with the fixed contacts. In a state wherein the movable plunger is in the opened position, a magnetic circuit is formed starting from the permanent magnets and returning to the permanent magnets through the movable plunger.