Magnetic latch construction
US3984795A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1976 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Feb 9, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H71/322
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrically releaseable permanent magnet latch includes a magnetic tube disposed within a U-shaped magnetic frame. Disposed within the tube are a lightweight armature and a coil spring biasing the armature forward. An electromagnet coil is wound about the tube and a pair of permanent magnets are inside the frame outboard of the tube. Magnetic diverter plates abut the magnets and are interposed between the magnets and coil. A collar on the tube provides a direct magnetic bridge to the diverters. Energization of the coil creates a flux which bucks the permanent magnet flux to permit the spring to overcome the armature holding force whereby the spring operates the armature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.