Patent ID: 9741516
Date: 2017-08-22
CPC Classifications: H01H

Claim:
1. An electromagnetic relay, comprising: a base; an iron core around which a coil is wound; a yoke which supports the iron core and forms a magnetic path together with the iron core; a contact portion which is configured with a movable contact and a fixed contact between the base and the coil; a coil terminal to which the coil is connected; a fixed contact terminal which is inserted at the base; a movable contact terminal which is attached to a vertical wall of the yoke; and a movable contact spring which is attached to the vertical wall of the yoke, wherein: the movable contact spring supports the movable contact of the contact portion, the movable contact spring supports the movable contact such that the movable contact is configured to contact and separate with respect to the fixed contact, the movable contact spring has a first attaching seat attached to the vertical wall of the yoke, and an operating piece that is bent and extends from the first attaching seat to be interposed between the base and the coil, the movable contact is attached to a front end of the operating piece, an iron piece is installed on a surface of the operating piece at the coil side, the operating piece is installed so that the iron piece is separated from the iron core, when the iron core is magnetized as a first electric current is applied to the coil, the operating piece is elastically deformed, the iron piece is adhered onto the iron core, and such that the movable contact comes into contact with the fixed contact and a second electric current is supplied to the fixed contact terminal and the movable contact terminal, the yoke has an upper wall facing the base with a certain gap therebetween, and the vertical wall of the yoke that is bent and extends in a direction approximately vertical to the upper wall, the iron core is fixed to the upper wall and a first end of the movable contact spring, and a first end of the movable contact terminal is fixed to the vertical wall of the yoke so as to be aligned in a short direction of a direction in which the upper wall and the vertical wall of the yoke are connected of the yoke, the movable contact terminal, comprising an external connecting portion, is molded integrally to a second attaching seat attached to the vertical wall of the yoke and the external connecting portion of the movable contact terminal that extends from the second attaching seat toward a side opposite to the yoke while interposing the base, the first attaching seat of the movable contact spring includes a first arm portion that is arranged on a width direction of the vertical wall of the yoke, the second attaching seat of the movable contact terminal includes a second arm portion that is arranged on the width direction of the vertical wall of the yoke, the second arm portion being adjacent to the first arm portion along the width direction of the vertical wall of the yoke, a first welding point, positioned between the vertical wall of the yoke and a first end of the first attaching seat, a second welding point, positioned between the vertical wall of the yoke and a first end of the second attaching seat, and a magnetic field, formed by supplying the second electric current to the fixed contact terminal and the movable contact terminal, is in a same direction as a magnetic field formed by supplying the first electric current to the coil.