Gas-blast switch
US4011421A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Aug 11, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H33/884
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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 o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.