Circuit breaker with smooth sliding operation
US4945325A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1988 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Nov 17, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H77/104
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit breaker wherein at least a pin sliding surface of a guide hole of a first contact arm, at least a pin sliding surface of a long hole of a second contact arm, and at least a contact surface of a second pin in contact with both the pin sliding surfaces, are treated by low-friction treatment to reduce frictional resistance, and surface-treated to provide surfaces exempt from attachment of molten metal caused by arcing; and furthermore at least the pin sliding surface of the first contact arm and at least the pin sliding surface of the long hole of the second contact arm are hardened to provide both the pin sliding surfaces with greater hardness than the second pin, thereby ensuring smooth movement of the second pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.