Linear actuator

Details Linear actuator Linear actuator

1989-07-10

1991-02-12

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335223, H01F 708

Patent

active

049927663

ABSTRACT:
In a linear actuator provided with a first projection on a movable part which is linearly driven with the electromagnetic force, so as to engage with one end of a compressing coil spring, and/or a second projection on a stationary part as opposed to the movable part, so as to engage with the other end of the coil spring, and a cup-like washer interposed between said at least one of the projections and said coil spring, a washer is so adapted that said at least one of projections is allowed to collide with the inner bottom part thereof. The linear actuator may comprise a resin film of small friction coefficient interposed between the movable part and the stationary part destined to contact with each other, a thermosensitive resistor which has an opposite resistance-temperature coefficient of the coil and is connected in series to the coil, and/or a means for detecting the relative position of the movable part with respect to the stationary part.

REFERENCES:
patent: 4649359 (1987-03-01), Doki et al.
patent: 4703297 (1987-10-01), Nagasaka et al.
patent: 4808955 (1989-02-01), Godkin et al.

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