Nec Corporation

Nippon Electric Co., Ltd.

Kunio Naito

Akira Sekiguchi

Yuichi Kamo

Kazutoshi Wakamatsu

Nobuo Mikami

Takashi Inagawa

Naoto Kushida

Matujiro Ikeda

Hidetoshi Sugawara

In a transfer-type electromagnetic relay comprising first and second lead members (26, 27) for first and second fixed contact studs (31, 32), respectively, and a third lead member (28) for an armature (36), first and second permanent magnets (46, 47) are directed to back surfaces of the first and the second lead members, respectively, with poles of the same name brought nearer to the respective leads. A single permanent magnet may be placed in the above-mentioned manner. Preferably, first and second arm members (43a, 43b) are attached to a leaf spring (37') fixed to the armature and extended from a central portion of the leaf spring on both sides thereof in directions different from each other. The leaf spring is manufactured without any bend and is therefore substantially flat. The third lead member partially comprises a non-magnetic portion at a center area thereof to support the armature. In order to provide make-before-break contacts, an armature height is rendered lower than a sum of a fixed contact height and a movable contact height given by each fixed contact stud and each movable contact stud.

Transfer-type electromagnetic relay comprising a permanent magnet under

A flat electromagnetic relay which includes a base member having at least two projections extending from a flat surface thereof. At least one hole (or indent), fitting a pertinent one of the projections, is formed in each supporting block that holds a contact, yoke, a hinging spring, or the like. These and similar members are successively stacked on the surface of the base member, with the projections fitted through the holes in the supporting blocks. The free ends of the respective projections are then deformed to secure and hold the components in position. A contact actuating card is put in place after the stack of contact holding blocks is assembled and locked in position. The block through which a contact carrying leaf spring is molded preferably has an end surface formed at an angle such that a portion of the leaf spring may be subsequently bent to extend substantially perpendicular to the remainder of the leaf spring, thereby forming a solder terminal. When used between the base member surface and one of the blocks, a return spring is precisely positioned preferably by an additional projection formed on the base member surface. A dust cover for the relay may have a ridge for restricting the return movement of the armature.

Flat electromagnetic relay

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Tokyo, Japan

Kunio Naito