Hydraulic pressure actuating apparatus for circuit breaker
US6815629B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2003 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | May 16, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2033/308
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a hydraulic pressure actuating apparatus for a circuit breaker, contacts of the circuit breaker have a moving contact and a stationary contact for turning on/off current. A shaft, at an end portion of which is attached the moving contact, and at the other end of which is attached a piston, is received within a cylinder. A directional control valve exchanges oil pressure for actuating the piston. For changing over the directional control valve, pilot valves are provided. Each pilot valve has a pair of valve bodies, each opposing to each other, and springs. One of the valve bodies is able to stroke up to contact with the valve body of the other valve body, therefore giving no ill influences upon actuating time, even if drawback occurs in the pilot valves in the hydraulic pressure actuating apparatus for the circuit breaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.