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:
Jul. 25, 1989
Filed:
Jun. 10, 1988
Mamoru Hosomi, Amagasaki, JP;
Takashi Yonezawa, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a puffer type gas-blast circuit breaker, a fixed arc contact (1) which has a hollow (1a) therein, with at least one vent (1b) on an end part thereof, stores a high pressure insulation gas which is heated and expanded by an arc formed between the fixed arc contact (1) and a moving arc contact (6) and is pressurized by passing through a nozzle (8) in an operation breaking a current, and after breaking of the current, the insulation gas stored in the hollow (1a) flows out of the vent (1b) and expands around the end part of the fixed arc contact; whereby a dielectric strength of the space around the end of the fixed arc contact (1) is strengthened so that reignition between the fixed arc contact (1) and the moving arc contact (6) is avoided.