Patent ID: 8274345
Filing Date: 2012-09-25
Classification: H01H

Abstract:
1. An electromagnetic relay comprising: a case; a coil configured to generate an electromagnetic force when the coil is energized; a movable member movable in a direction parallel to an axial direction of the coil; a plate-shaped first fixed contact support having a first fixed contact; a plate-shaped second fixed contact support having a second fixed contact; a plate-shaped movable body configured to contact and be separated from the first and second fixed contact supports, the movable body having first and second planar surfaces substantially perpendicular to the axial direction of the coil; a pressure spring in contact with the first planar surface of the movable body and configured to urge the movable body such that the movable body contacts the first and second fixed contact supports; and a return spring configured to urge the movable body via the movable member such that the movable body is separated from the first and second fixed contact supports, wherein the movable body contacts the first fixed contact at a first contact portion, and the movable body contacts the second fixed contact at a second contact portion, when the movable member is driven by the electromagnetic force of the coil, the second fixed contact support further has a third fixed contact, the movable body contacts the third fixed contact by a point contact when the movable body contacts the first and second fixed contacts, the first and second fixed contact supports are fixed to the case, one end of each of the first and second fixed contact supports is located in a housing space formed in the case, the second and third fixed contacts are integrally formed on the one end of the second fixed contact support and spaced from each other in a lengthwise direction of the second fixed contact support, the movable member and the pressure spring are substantially coaxial with each other and are arranged on opposite sides of the movable body, the movable member contacts the second planar surface of the movable body to urge the second planar surface in the coaxial direction and to drive the movable member against resilience of the pressure spring thereby separating from the first fixed contact, the second fixed contact and the third fixed contact, when the coil is de-energized, and the movable member separates from the second planar surface of the movable body in the coaxial direction thereby causing the movable body to contact the first fixed contact, the second fixed contact, and the third fixed contact by resilience of the pressure spring, when the coil is energized.