Bistable electromagnetic relay
US6831535B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2003 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Nov 25, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2051/2218
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is disclosed an electromagnetic relay comprising a stationary first member and a second member adapted to move towards and away from the first member such that when the second member move towards the first member an electrical contact is closed. Spring means biases the members apart, and permanent magnet means are provided for generating a force of attraction between the members, and selectively operable means is provided for generating an electromagnetic force. The permanent magnet means has a strength such that when the first and second members are apart the permanent magnet means is insufficient to overcome the spring means, but when the members are brought together the permanent magnet means is able to hold the members together against the spring means. The means for generating an electromagnetic force can be operated in a first condition to provide an attractive force between said members sufficient with the permanent magnet means to overcome the spring means and to bring the members together, and in a second condition to provide a repulsive force between members sufficient with the spring means to overcome the permanent magnet means and move the members apart.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.