Electromagnetic relay
US4689587A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | May 2, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H50/548
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnetic relay has a hollow coil having a magnet system forming a flux guidance loop in a circuit with a portion extending outside of and parallel to the coil, and another portion, formed by the armature, extending through the interior of the hollow coil. The loop is interrupted by a working air gap, which is slanted relative to the longitudinal axis of the coil, and which is completely encompassed within the interior of the coil. The air gap is formed by a wedge-shaped portion of the armature in registry with a wedge-shape pole piece. The slanted surfaces are longer in length than surfaces parallel to the coil axis, thereby providing a larger area for flux transfer through the air gap. Additionally, by slanting the flux transfer faces within the hollow coil, the overall size of the relay is not increased. The free end of the armature at which the flux transfer surface thereof is disposed as a continuation which engages a contact spring disposed at one end face of the coil body, for moving the contact spring with respect to one or more stationary contact elements for electrical connection and disconnection therewith.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.