Rotary actuator
Patent 5634390 Issued on June 3, 1997. Estimated Expiration Date: 
October 25, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 25, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesBall screw actuator Motion converting mechanism Air-powered splined rotary actuator Pressure cylinder with low tolerance fit capable of supporting large transverse loads Magnetic transmission mechanism and applications thereof Patent #: 5456134 InventorsAssigneeApplicationNo. 548258 filed on 10/25/1995US Classes:92/33, Element extends through working member portion74/89, Reciprocating or oscillating to or from alternating rotary74/424.73, Threadless92/5R, WITH (1) SIGNAL OR INDICATOR OR (2) INSPECTION WINDOW IN EXPANSIBLE CHAMBER WALL PORTION92/32Working fluid-actuated interengaging means permits unidirectional rotation of element relative to fixed partExaminersPrimary: Denion, ThomasForeign Patent References
International ClassF01B 003/00Foreign Application Priority Data1994-11-19 JPAbstractDisclosed 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.Other References
Field of SearchRECTILINEARLY MOVING WORKING MEMBER AND COAXIAL OR PARALLEL ELEMENT SLIDABLY INTERENGAGED FOR RELATIVE ROTARY MOVEMENTWorking fluid-actuated interengaging means permits unidirectional rotation of element relative to fixed part Element extends through working member portion WITH (1) SIGNAL OR INDICATOR OR (2) INSPECTION WINDOW IN EXPANSIBLE CHAMBER WALL PORTION Planar surface with orthogonal movement only Reciprocating or oscillating to or from alternating rotary | |
