Electromagnetic relay

• US 10,361,049 B2
• Filed: 06/12/2017
• Issued: 07/23/2019
• Est. Priority Date: 07/05/2016
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Kohinata, Hiroaki, Uchiyama, Yusuke, Kobayashi, Koyuru, Takano, Satoshi
• Primary Examiner(s): Ismail, Shawki S
• Assistant Examiner(s): Homza, Lisa N
• Application Number:
  US15/619,660
• Publication Number:
  US 20180012717A1
• Time in Patent Office: 771 Days
• Field of Search: 335 83
• CPC Class Codes: H01H 45/02 Bases; Casings; Covers frames for mounting two or more relays or for mounting a relay and another electric component H02B1/01, H04Q1/08, H05K
• CPC Class Codes: H01H 45/10 Electromagnetic or electrostatic shielding casings H01H45/02
• CPC Class Codes: H01H 50/041 Details concerning assembly of relays
• CPC Class Codes: H01H 50/18 Movable parts of magnetic circuits, e.g. armature
• CPC Class Codes: H01H 50/24 Parts rotatable or rockable outside coil
• CPC Class Codes: H01H 50/321 the mechanical latch being controlled directly by the magnetic flux or part of it
• CPC Class Codes: H01H 50/56 Contact spring sets
• CPC Class Codes: H01H 50/58 Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature
• CPC Class Codes: H01H 50/642 intermediate part being generally a slide plate, e.g. a card
• CPC Class Codes: H01H 51/01 Relays in which the armature is maintained in one position by a permanent magnet and freed by energisation of a coil producing an opposing magnetic field H01H51/02 - H01H51/26 take precedence
• CPC Class Codes: H01H 51/287 Details of the shape of the contact springs

Abstract

An electromagnetic relay includes an electromagnet, an armature configured to shift in response to a magnetic force generated by the electromagnet, a movable spring having a movable contact disposed thereon, a fixed spring including a first contact strip and a second contact strip, the first contact strip having a first fixed contact disposed thereon, the second contact strip having a second fixed contact disposed thereon, the first fixed contact and the second fixed contact facing the movable contact, and a linkage member configured to link the armature and the movable spring to shift the movable spring in conjunction with movement of the armature.

Claims

1. An electromagnetic relay, comprising:

an electromagnet;

an armature configured to shift in response to a magnetic force generated by the electromagnet;

a movable spring having a movable contact disposed thereon;

a fixed spring including a first contact strip and a second contact strip, the first contact strip having a first fixed contact disposed thereon, the second contact strip having a second fixed contact disposed thereon, the first fixed contact and the second fixed contact facing the movable contact; and

a linkage member configured to link the armature and the movable spring to shift the movable spring in conjunction with movement of the armature

wherein the first contact strip and the second contact strip are configured to be elastically deformable independently of each other.

2. The electromagnetic relay as claimed in claim 1, wherein the linkage member is connected to a linkage point of the movable spring, the linkage point being situated between the movable contact and a fixed end of the movable spring, and the linkage point of the movable spring is situated between a fixed end of the fixed spring and a branch point of the fixed spring in a plan view taken in a direction in which the movable contact moves, the branch point being a point at which the fixed spring divides into the first contact strip and the second contact strip.

3. The electromagnetic relay as claimed in claim 1, wherein the fixed spring is a plate-shaped spring that has the fixed end and a free end, the fixed spring dividing into the first contact strip and the second contact strip toward the free end.

4. The electromagnetic relay as claimed in claim 3, wherein the movable spring is a plate-shaped spring that has a fixed end and a free end, the free end having the movable contact disposed thereon, and the movable spring is configured to exhibit elastic torsion between the fixed end and the free end.

5. The electromagnetic relay as claimed in claim 4, wherein the linkage member is configured to push the movable spring at a point situated between the movable contact and the fixed end of the movable spring.

6. The electromagnetic relay as claimed in claim 5, wherein the movable spring is configured to exhibit elastic torsion between the free end and the point at which the movable spring is pushed by the linkage member.