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:
Nov. 24, 1992
Filed:
Oct. 29, 1990
Hendrik A Bosch, Hengelo, NL;
Soedjimat F Darmohoetomo, Halle, NL;
Holec Systemen & Componenten B.V., Hengelo, NL;
Abstract
An improved trip device for an electric switch comprises a yoke, a permanent magnet immovably positioned with respect to the yoke and a movably supported armature forming a first magnetic circuit, in which the armature is able to assume a first position under the influence of the magnetic field of the permanent magnet. A magnet winding and spring are provided for causing the armature to assume a second position in response to the magnetic field generated by an electric current, flowing during operation in the magnet winding. For adjusting the threshold value at which the armature is moved to its second position, a second magnetic circuit in the form of shunt interacting with the yoke and the permanent magnet is provided. The magnetically effective surface area of the shunt is smaller in the vicinity of the section thereof which interacts with the yoke than in the vicinity of the section which interacts with the permanent magnet.