Movable yoke-type lifting magnet device
US4840417A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 27, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Nov 27, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/206
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A movable yoke-type lifting magnet device including a main core wound with a coil and at least one yoke magnetically coupled to the core. The movable mechanism of the yoke enables the yoke to freely follow the contour of a workpiece to be lifted. An auxiliary core may be provided between each said at least one yoke to provide a yoke-type lifting magnet device. The auxiliary core greatly increases the magnetic forces induced between the cores and the yoke. Combination of the magnetic coupling between the yokes and the core and the provision of the auxiliary core provides a movable yoke-type lifitng magnet device wherein the yoke can freely follow the contour of a workpiece and the magnetic forces between the cores and the yoke are greatly increased. Such a combination prevents the yoke from slipping relative to the cores and stable lifting is possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.