Bell alarm for system power breaker
US5714940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1996 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Sep 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H83/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A bell alarm system is provided for a circuit breaker in which the actuation of a flux shift trip device causes an electrical switch to be energized thus providing a bell alarm indication that the circuit breaker has been tripped. The flux trip device impinges against a pivotally rotated lower lever mechanism which has a knee which causes rotation of an upper lever against the influence of a spring attached between the two levers. As the knee moves along a surface of the upper lever mechanism, the relative rotation of the two lever members about their support pins is such as to cause the tension on the spring to increase. Because of this vibration in the circuit breaker itself or minute low level movements of the plunger mechanism will not cause the bell alarm to be actuated. The bell alarm will not be actuated until the aforementioned lower knee has rotated sufficiently far along the previously described surface to clear an upper knee in the upper lever mechanism thus allowing the force of the spring to cause the upper lever to actuate the bell alarm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.