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:
Apr. 23, 2013
Filed:
Apr. 21, 2009
Kazuhiro Nagatake, Numazu, JP;
Tooru Kobayashi, Mishima, JP;
Yoshihiko Matsui, Numazu, JP;
Meiden T&D Corporation, Tokyo, JP;
Abstract
Vacuum circuit breakers are to gain an extended lifetime by reducing contact face damage of moving and fixed electrodes with improved voltage withstand performance therebetween and enhanced interruption performance. Vacuum circuit breaker of the present invention has bulbhaving: insulative vacuum tube; and fixed electrodeon end of current-carrying conductorand moving electrodeon end of another current-carrying conductorarranged in insulative vacuum tubewith their electrode contact faces opposed each other. Operation system for manipulating current-carrying conductorof moving electrodeis equipped with compression-springand auxiliary compression-springthat increases initial opening speed of moving electrode. Auxiliary compression-springceases energizing in the middle of a circuit breaking movement of moving electrodeand begins storing spring energy in the middle of a circuit closing movement of the same.