Katten Muchin Zanis Rosenman
Electromagnetic relay, apparatus and method for making it
An electromagnetic relay is basically constructed by an insulation base and an armature block. Herein, the insulation base is constructed by a fixed-side terminal set including fixed contacts, a coil block in which a coil is wound about a middle portion of a U-shape iron core, and a permanent magnet, all of which are integrally held together by a fixed-side insulator. The armature block is constructed by a moving-side terminal set including moving contacts and an armature, all of which are integrally held by a moving-side insulator. The armature block is mounted on the insulation base in such a way that the moving contacts are placed opposite to the fixed contacts respectively, and it is supported by a support point to pivotally move on the permanent magnet under an effect of electromagnetic force. Specifically, the fixed-side insulator is made by molding using resin material to integrally hold the fixed-side terminal set, coil block and permanent magnet together at prescribed positions, so it is possible to improve an accuracy in positioning of them. In addition, the fixed-side insulator is formed in a prescribed shape having a contact fixing portion that partly extends to provide engagement portions by which the permanent magnet and U-shape iron core are tightly fixed together under a contact condition where the permanent magnet is placed in tight contact with the side-end portions of the U-shape iron core.
NEC Corporation
H H
H01F H01H
additional inventional
Masao Yoshiyuki Kazuyuki Masaaki Naohiro
Saito Hosaka Oyama Sato Tanioka