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:
Feb. 04, 1997
Filed:
May. 15, 1995
Denis Dufournet, Bron, FR;
Gec Alsthom T & D SA, Paris, FR;
Abstract
A circuit-breaker including two arcing contacts that co-operate with each other, at least one of which is part of a moving contact assembly that is secured to a drive member and that is constituted by a first tube carrying the moving arcing contact at its end, and by a second tube that is coaxial with the first tube so as to define firstly an expansion chamber on one side of an annular wall, and secondly a compression chamber on the other side of the annular wall, the compression chamber being closed by a piston. A compression device is provided for compressing the gas in the compression chamber during a first portion of the displacement of the moving contact assembly, and a pressure-reducing device is provided for reducing the pressure of the gas in the compression chamber during a second portion of the same displacement of the moving contact assembly. The compression device comprises the fixed piston that co-operates with the first tube over a certain travel distance x, and the pressure-reducing device includes a device for exhausting the gas contained in the compression chamber from the compression chamber, and which operates once the distance x has been travelled.