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US 6,805,012 B2Granted
Linear actuator
AssigneeMicro Motion, Inc.
InventorsRoger Scott Loving, Anthony William Pankratz
Life of this patent
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Abstract
The present invention relates to a linear actuator that maximizes the flux density in the air gap where work is to be done by increasing the lines of flux that are captured while keeping the cost of production and mass relatively low. This is achieved by an improved linear actuator, which is characterized by a keeper comprised of a cross-shaped piece of ferromagnetic material bent such that the four ends of the cross are located perpendicular to the longitudinal axis of the magnet.
Claims34
An apparatus for substantially enclosing a magnet, the apparatus comprising:
- a keeper having a base;
- and
- at least three legs extending from the base, each leg having
- a bottom member attached to and extending radially away from the base,
- a side member attached to and extending upwardly from the bottom member, where at least a portion of the side member is parallel to the longitudinal axis of the base, and
- a top member attached to and extending inwardly from the side member towards the longitudinal axis of the base, where at least a portion of the top member is perpendicular to the longitudinal axis of the base.
3 more elements
Dependencies are inferred from the claim text.