The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2001
Filed:
Jul. 26, 2000
Pierre Baginski, Grenoble, FR;
Daniel Rota, Vif, FR;
Square D Company, Palatine, IL (US);
Abstract
An electromagnetic actuator comprises a fixed magnetic circuit made of ferromagnetic material and a movable assembly designed to slide axially between a rest position and an active position. Two return springs bias the movable assembly to its rest position, the second spring having a greater stiffness than the first one. An excitation circuit generates a magnetic flux which is designed, in inrush mode, to move the movable assembly from its rest position to its active position and, in holding mode, is sufficient to hold the movable assembly in the active position. In a first part of the axial travel of the movable assembly from its rest position to its active position, the action of the first spring is preponderant, whereas in the remaining travel up to the active position, the action of the second spring is preponderant.