Electromagnetic relay

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive

Patent

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Details

336196, 336206, 336208, H01H 5122

Patent

active

060140682

ABSTRACT:
A miniature electromagnetic relay is capable of increasing the coil packing density, yet assuring electrical insulation of the coil from a core of the electromagnet. The relay includes a pair of movable and fixed contacts, an armature carrying the movable contact, and an electromagnet block having an excitation coil which moves the armature for closing and opening the contacts upon being energized. The electromagnet block includes a generally U-shaped core with a center core and a pair of yokes extending from opposite ends of the center core, flanges of dielectric material molded respectively around portions of the yokes, and a dielectric tape fitted around the center core over substantially the entire length of the center core to receive therearound the excitation coil in an electrically insulating relation from the core. Each of the flanges is formed integrally with an inward sleeve which extends over a limited length along the center core in such a relation that the dielectric tape overlaps the inward sleeves at opposite width ends of the tape. Thus, the coil can be wound over the substantially full length of the core and be successfully insulated from the core over the full length thereof without requiring additional separate member.

REFERENCES:
patent: 2180420 (1939-11-01), Larsen
patent: 3043994 (1962-07-01), Anderson et al.
patent: 5374308 (1994-12-01), Dittman et al.
A. B. Brown, "Fabrication of Ultrathin Bobbins", IBM Technical Disclosure Bulletin, Jun. 1970.

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