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. 27, 1982
Filed:
Jan. 21, 1980
Peter Kull, Schafisheim, CH;
Sprecher & Schuh AG, Aarau, CH;
Abstract
A gas-blast switch containing both a stationary and a movable contact element. At one of these contact elements there is arranged a blast nozzle whose inlet chamber or compartment is connected with the outlet of a pump chamber containing an extinguishing gas and which can be placed under pressure during the cutoff stroke. Between the inlet chamber of the blast nozzle and the pump chamber there is a valve arrangement which is pre-biased in the closing direction. The valve arrangement responds when there is an excess pressure in the pump chamber and opens in the direction of the inlet chamber or compartment. To prevent escape of the extinguishing gas heated by the arc at the region of the blast nozzle, and thus, placed under pressure, and therefore, to also reduce the mechanical and thermal loading of the blast nozzle, the valve arrangement comprises a switching valve which, in the rest position, connects at least part of the inlet chamber of the blast nozzle with the space or chamber surrounding such blast nozzle and upon response of such switching valve disconnects the aforesaid part of the inlet chamber from the space surrounding the inlet chamber of the blast nozzle.