Rotary actuator
US5634390A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Oct 25, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19712
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed is a rotary actuator utilizing magnetic screws which are stably rotatable at a great torque with little torque variation. The rotary actuator comprising (a) a closed hollow cylinder, a piston sliding within the cylinder, and a rotary shaft which rotates with the sliding of the piston, has (b) a first magnetic screw member which makes a linear motion in synchronism with the sliding of the piston, and is provided with a first spiral magnetized band, and (c) a rotary shaft rotatably supported in relation to the first magnetic screw member, and having a second magnetic screw provided with a second spiral magnetized band. (d) With the sliding of the piston, the second magnetic screw receives the magnetic force from the first magnetic screw to thereby rotate the rotating shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.