Buffering device for the operating mechanism of a switchgear, and method of lubrication thereof
US9570891B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2014 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | May 12, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/605
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.