Magnetic screw device, method of manufacturing magnetic screw device, and conveying device with magnetic screw
US5913401A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1996 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Aug 26, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2600/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnetic screw device comprising an internal (male) magnetic screw having the even number of magnetized bands spirally magnetized on an outer surface with contiguous magnetized bands having opposite polarities and an external (female) magnetic screw having the even number of magnetized bands spirally magnetized on the same outer surface with contiguous magnetized bands having opposite polarities. The internal and external magnetic screws are composed of a plurality of spiral cylindrical magnets disposed in its axis direction, the spiral cylindrical magnet being formed of short cylindrical permanent magnet materials on each outer or inner surface which is spirally magnetized. The internal magnetic screw includes a rod member to support the inner spiral cylindrical magnets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.