Electromagnetic relay

Abstract

An electromagnetic relay includes an exciting coil, a pair of fixed contacts, a movable spring, a magnet, and a yoke in contact with the magnet. The pair of fixed contacts is arranged along a first direction. The movable spring comes into contact with or moves away from the fixed contacts in response to the turn on or off of current to the exciting coil. The magnet prolongs the arc generated between the fixed contacts and the movable spring. The magnet is adjacent to the fixed contacts along a second direction orthogonal to the first direction, and is adjacent to the exciting coil along a third direction orthogonal to the first direction and the second direction. The yoke is adjacent to the fixed contacts along the third direction in a state where the yoke is in contact with the magnet.

What is claimed is: 
     
       1. An electromagnetic relay comprising:
 an exciting coil; 
 a pair of fixed contacts arranged along a first direction; 
 a movable spring which comes into contact with or moves away from the pair of fixed contacts in response to current to the exciting coil being turned on or off; 
 a magnet which prolongs an arc generated between the pair of fixed contacts and the movable spring; and 
 a yoke in contact with the magnet, 
 wherein the magnet is adjacent to the pair of fixed contacts along a second direction orthogonal to the first direction, and is adjacent to the exciting coil along a third direction orthogonal to the first direction and to the second direction, and the yoke is adjacent to the pair of fixed contacts along the third direction when the yoke is in contact with the magnet, 
 wherein edges of the yoke extend beyond edges of the magnet in the first direction and the second direction to provide a planar surface in the third direction, 
 wherein the magnet overlaps the yoke along the third direction, and 
 wherein the fixed contacts and the magnet are arranged along the second direction. 
 
     
     
       2. The electromagnetic relay according to  claim 1 ,
 wherein the yoke includes a pair of adjacent portions that are adjacent to the pair of fixed contacts, and is provided with a cutout between the pair of adjacent portions. 
 
     
     
       3. The electromagnetic relay according to  claim 1 ,
 wherein the yoke is longer than a distance between the pair of fixed contacts in the first direction. 
 
     
     
       4. The electromagnetic relay according to  claim 1 , further comprising:
 a case that stores the exciting coil, the pair of fixed contacts, and the movable spring, 
 wherein the case is provided with a recess that opens outwardly at a position adjacent to the exciting coil in the third direction, 
 the magnet is stored in the recess, and 
 the yoke is in contact with an outer surface of the case when the yoke is in contact with the magnet. 
 
     
     
       5. The electromagnetic relay according to  claim 1 ,
 wherein the movable spring opposes the pair of fixed contacts in the second direction, and 
 the magnet has:
 a first pole which is in contact with the yoke; and 
 a second pole which opposes the exciting coil, and the magnet is adjacent to the pair of fixed contacts on an opposite side to the movable spring, and is capable of generating a magnetic flux in the third direction between the movable spring and the pair of fixed contacts. 
 
 
     
     
       6. The electromagnetic relay according to  claim 1 , wherein a first end of said movable spring comes into contact with or moves away from the pair of fixed contacts and an opposite end of the movable spring is connected to the another yoke. 
     
     
       7. The electromagnetic relay according to  claim 1 , the exciting coil including an aperture within which a core is received, the and another yoke including an aperture that receives a portion of the core. 
     
     
       8. The electromagnetic relay according to  claim 1 , said movable spring comprising a generally L-shaped spring member, a first leg of said L-shaped spring member connected to said another yoke, and a second leg of said L-shaped spring member including a pair of contact portions configured to come into contact with said fixed contacts. 
     
     
       9. The electromagnetic relay according to  claim 1 , said yoke further comprising another yoke including a generally L-shaped member having two legs, one end of said movable spring being connected to one leg of said other yoke, said one leg being positioned opposite said magnet with respect to said exciting coil. 
     
     
       10. The electromagnetic relay according to  claim 1 , further comprising an armature attached to a portion of the movable spring, said armature being configured to move into and out of contact with said exciting coil in a direction substantially the same as a direction of movement of said movable spring towards and away from contact with the pair of fixed contacts. 
     
     
       11. An electromagnetic relay comprising:
 an exciting coil;   a first fixed contact;   a second fixed contact;   a movable contact provided on a movable spring that bends around a fixed portion, such that the movable contact moves along a path to come into contact with or move away from the first fixed contact or the second fixed contact in response to a current to the exciting coil;   a yoke adjacent to the movable contact and extending along said path on a side of the movable contact opposite to said fixed portion; and   a magnet connected with the yoke, the magnet and the yoke generating a flux proximate the movable contact, wherein the magnet is positioned proximate to the movable contact in a direction along said path,   wherein the yoke extends along two extending directions to provide a planar surface of the yoke in an orthogonal direction that is orthogonal to the two extending directions,   wherein the magnet extends along the two extending directions to provide a planar surface of the magnet in the orthogonal direction that is orthogonal to the two extending directions,   wherein a size of the planar surface of the magnet being larger than a size of each side surface of the magnet orthogonal to the planar surface of the magnet, and   
       wherein the planar surface of the magnet is in contact with the planar surface of the yoke.  
     
     
       12. The electromagnetic relay according to claim 11,
 wherein the yoke is longer than a distance between the first fixed contact and the movable contact in said direction when the movable contact is disconnected from the first fixed contact.