Electric switch with counteracting electro-electro-dynamic forces
US4849590A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Apr 1, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/018
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch has contacts constructed so that an electro-dynamic force is created by the current flowing through the switch which tends to maintain the switch in a closed state. This force counteracts other electro-dynamic forces which tend to open the switch. The contact design is particularly adapted from use in a single pole-double throw switch having a contact arm that is movable between two fixed contacts. The electro-dynamic force compensation exists between the contact arm and whichever one of the fixed contacts the contact arm is against. The fixed contacts also include arc runners so that any arc that develops as the contacts separate eliminates electro-dynamic force which tends to maintain the switch in a closed state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.