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:
Nov. 19, 2002
Filed:
Apr. 25, 2001
Denis Dufournet, Sathonay-Camp, FR;
Wolfgang Grieshaber, Lyons, FR;
Michel Perret, Bourgoin-Jallieu, FR;
Alstom, Paris, FR;
Abstract
An insulating blast nozzle for a circuit breaker, the circuit breaker having a first arcing contact and a second arcing contact that separate from each other when the circuit breaker is opened subsequent to prior separation of permanent contacts, said insulating blast nozzle being secured to one of the permanent contacts and being generally horn-shaped, having a throat and defining a volume of revolution having an upstream portion and a downstream portion joined by the throat, in which the inside volume is cylindrical and closed by the second arcing contact when the circuit breaker is closed and for a few milliseconds after the arcing contacts have separated, the wall of the nozzle in its portion defining the upstream portion of said volume of revolution surrounding said first arcing contact, the downstream portion of said volume comprising a first conical portion, wherein said first conical portion is followed by a second conical portion having a flare angle that is more open than that of said first conical portion.