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:
Mar. 08, 1977
Filed:
Aug. 11, 1975
Richard Thaler, Unterentfelden, CH;
Sprecher & Schuh AG, Aarau, CH;
Abstract
A gas-blast switch comprising two contact elements which can be brought into and out of engagement with one another, a drive means for actuating at least one of said contact elements, and a pump device consisting of a piston and cylinder actuatable in response to the switching movements of the gas-blast switch. During the cut-off movements of the gas-blast switch the pump device conveys an extinguishing agent out of a pump compartment of the pump device through a nozzle into an extinguishing or blow-out compartment or chamber, the nozzle being constructed to take-up the switching arc existing between the separating contact elements. The piston consists of a plurality of piston portions guided to be relatively displaceable in a gastight fashion within one another and dividing the piston surface confronting the pump compartment, one of the piston portions being positively connected with the drive means. Between the one piston portion positively connected with the drive means and a second piston portion and between such second piston portion and the pump cylinder there is arranged a respective releasable coupling mechanism which upon cut-off of the gas-blast switch and as a function of the pressure difference between the pump compartment and the exhaust compartment selectively positively connects the second piston portion either with the one piston portion below a pre-selected excess pressure boundary or limit prevailing in the pump compartment or with the pump cylinder when there prevail pressure values which are above the pre-selected pressure limit.