Mpc Products Corporation

Jerry D Hielkman

Gary A Sparks

David J Treadwell

A solenoid has a multistage telescoping plunger which together produce a single stroke. Each plunger stage has a separate air gap individually associated therewith. As the first air gap closes responsive to movement of a first telescoping plunger stage, a portion of the stator becomes magnetically saturated; however, magnetic material has moved with the first plunger stage in order to bridge the saturated position which switches the flux path to a second air gap via a second of the telescoping plunger stages. An advantage is that the solenoid has a long stroke with a high pulling force on both the initial and the final ends of a continuous stroke formed by the separate movements of the first and second plunger stages.

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Franklin Park, IL, United States of America

Jerry D Hielkman