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:
Sep. 14, 1999
Filed:
Jun. 25, 1998
Ayumu Morita, Hitachi, JP;
Takashi Sato, Hitachi, JP;
Youichi Ohshita, Hitachinaka, JP;
Tooru Tanimizu, Hitachi, JP;
Masayoshi Hayakawa, Hitachi, JP;
Toshio Horikoshi, Fujioka, JP;
Ryutaro Yamamoto, Komae, JP;
Hitachi, Ltd., Tokyo, JP;
The Tokyo Electric Power Co., Ltd., Tokyo, JP;
Abstract
In a vacuum type switch gear device an L shaped stationary and movable conductors arrangement, a transitive portion from one spiral arc groove to a neighboring another spiral arc groove on the surface of a movable electrode defined by the terminating end portion of the one spiral groove, the starting end of the adjacent neighboring other spiral groove and the outer circumferential edge portion of the movable electrode is arranged in a substantially overlapping relationship in a vertical direction with the movable conductor. Thus an adverse effect of a current loop flowing through the movable conductor against an arc generated between movable and stationary electrodes is limited to thereby improve the circuit breaking performance.