Contact assembly for high voltage fuse
US4109227A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Nov 11, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/143
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a high voltage expulsion type fuse, a fusible element is connected between an arcing rod and a contact element. The arcing rod is biased for movement by a spring, and when the fuse is assembled, the contact element is pulled through the fuse compressing the spring until the contact element is pulled partially through an opening in a contact bridge which is threaded into the metal exhaust ferrule of the fuse. Once the contact element is in the correct position, the bridge is swaged to attach the element to the bridge. The element has tapered grooves at the end that is inserted into the bridge so that when the bridge is swaged, the tapered grooves tend to force the contact element further into the opening so that a shoulder on the element remains firmly against the bridge. A threaded member attached to the end of the element may be engaged to pull the element through the bridge. After the bridge has been swaged, the thread member is broken off since it is no longer needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.