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:
Jan. 01, 1985
Filed:
Jul. 25, 1983
Samuel Berg, Ludvika, SE;
ASEA Aktiebolag, Vaster.ang.s, SE;
Abstract
A puffer type circuit breaker is provided with a pump means consisting of a piston and a cylinder for producing a blast of arc-extinguishing gas. The movable arcing contact of the circuit breaker and the cylinder are connected to an operating device via a rod axially displaceable through an opening in the piston. In the piston there is arranged a check valve, which upon closing of the breaker opens for subsequent filling of the pump chamber with arc-extinguishing gas. The check valve comprises a guiding sleeve of a ductile material (e.g. polyetrafluoro ethylene), which sealingly surrounds the rod and is fixed with a certain axial mobility in the opening in the piston arranged for the rod. The sleeve controls (or is fixedly connected to) the movable valve means of the check valve and, in addition, serves as a seal and a bearing between the rod and the piston.