ELECTROMAGNETIC SWITCH

摘要

Two protrusions are disposed on the fixed contact along a lateral direction on a contacting surface. The two protrusions are disposed in a longitudinal direction with a predetermined interval on the contacting surface, and a planar portion is formed between the two protrusions. A single projection that intersects perpendicular to the two protrusions disposed on a first fixed contact and another single projection that intersects perpendicular to the two protrusions disposed on a second fixed contact are disposed on a movable contact. Thereby, when the movable contact contacts to a pair of fixed contacts, since the protrusions disposed on the fixed contact and the projections disposed on the movable contact contacts only at intersections of each other, a contacting surface pressure is increased and a crushing force for ice frozen on a surface of the fixed contact becomes large.

主权项

1. An electromagnetic switch comprising:
a solenoid that forms an electromagnet by energization to a coil; a pair of fixed contacts respectively connected to a power supply side and a load side of an electrical circuit via two connecting terminals; and a movable contact that conducts and cuts off between the pair of fixed contacts in response to respective ON/OFF operation of the solenoid; wherein, the pair of fixed contacts has a first fixed contact disposed in one side in a radial direction that intersects perpendicular to an axial direction of the solenoid and a second fixed contact disposed in another side in the radial direction; when a direction which intersects perpendicular to the radial direction on a plane of the fixed contact is referred to as a longitudinal direction and another direction which intersects perpendicular to the longitudinal direction is referred to as a lateral direction, the fixed contact has two protrusions extending in the lateral direction on a contacting surface that faces the movable contact; the two protrusions are disposed in the longitudinal direction with a predetermined interval therebetween, and a planar portion recessed relative to apexes of the protrusions is formed between the two protrusions; the movable contact has a first contacting surface facing the first fixed contact and a second contacting surface facing the second fixed contact; a single projection that intersects perpendicular to the two protrusions disposed on the first fixed contact is disposed on the first contacting surface; and another single projection that intersects perpendicular to the two protrusions disposed on the second fixed contact is disposed on the second contacting surface.