Electromagnetic switching device
US3987383A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jul 31, 1975 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | Jul 31, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H51/2254
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnetic switching device comprises a bobbin with a coil mounted thereon, the bobbin forming a protective tube with a contact chamber at each end. Embedded in the bobbin are a plurality of terminals connected to the coil, pole shoes, and contact terminals connected to the pole shoes. An armature is disposed in the tube and has two free end portions coated with contact material facing end portions of the pole shoes that extend from opposite walls of a respective one of the contact chambers. At least one permanent magnet is mounted between flanges of the bobbin at each end of the tube, these magnets and the pole shoes being disposed symmetrically in relation to the longitudinal axis of the tube and at least one further axis perpendicular to such longitudinal axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.