Linear actuator

Details Linear actuator Linear actuator

1989-06-27

1991-11-12

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335278, H01F 708

Patent

active

050651269

ABSTRACT:
In a linear actuator including a casing, an output shaft passing through the casing and being mounted slidably in a direction along the axis thereof, a solenoid coil disposed within the casing in coaxial relation to the output shaft, a magnet disposed in such a manner that the magnetic flux thereof is linked with windings of the coil, the output shaft mechanically connected to one of the magnet and the coil to form a movable part, and a spring adapted to urge the output shaft in one direction along the axis thereof, and a spacer made of high permeability material and interposed between the casing and either the coil or the magnet, whichever is fixed on the casing to form a stationary part.

REFERENCES:
patent: 4558293 (1985-12-01), Haneda et al.
patent: 4649359 (1987-03-01), Doki et al.
patent: 4698608 (1987-10-01), Kimble
patent: 4703297 (1987-10-01), Nagasaka
patent: 4808955 (1989-02-01), Godkin et al.

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