Electromagnetic contactor

Patent metadata

Field	Value
Publication number	US-9520246-B2
Application number	US-201514676896-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	Dec 5, 2012
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

An electromagnetic contactor includes a contact mechanism having a pair of fixed contacts disposed to maintain a predetermined interval in a longitudinal direction, and a movable contact disposed above the pair of fixed contacts, the movable contact contacting to and detaching from the pair of fixed contacts. Each of the pair of fixed contacts has a fixed contact portion, the movable contact extends in a longitudinal direction thereof and has a pair of movable contact portions contacting the pair of fixed contacts, and the movable contact is disposed so as to move in a vertical direction thereof on a connecting shaft fixed to a movable plunger and is pressed down by a biasing force of a contact spring in a downward direction thereof on a central portion of the movable contact in the longitudinal direction, the movable contact being held on the connecting shaft.

First claim

What is claimed is:

1. An electromagnetic contactor, comprising:
a contact mechanism having a pair of fixed contacts disposed to maintain a predetermined interval in a longitudinal direction thereof; and a movable contact disposed above the pair of fixed contacts, the movable contact contacting to and detaching from the pair of fixed contacts,
wherein each of the pair of fixed contacts has a fixed contact portion, the movable contact extends in a longitudinal direction thereof and has a pair of movable contact portions contacting the pair of fixed contacts, and the movable contact is disposed so as to move in a vertical direction thereof on a connecting shaft fixed to a movable plunger and is pressed down by an urging force of a contact spring in a downward direction thereof on a central portion of the movable contact in the longitudinal direction thereof, the movable contact being held on the connecting shaft,
a plate spring member, extending in a longitudinal direction thereof and having, in vicinities of two outer ends in the longitudinal direction of the plate spring member, a pair of urging force application portions that applies a predetermined urging force in the downward direction to the pair of movable contact portions, is attached to the connecting shaft, and
the plate spring member includes an attachment plate portion arranged between the contact spring and the movable contact so that the movable contact is urged by the urging force of the contact spring and the plate spring member.

2. The electromagnetic contactor according to claim 1 , wherein the contact spring is fixed between an upper end of the connecting shaft and the plate spring member so that the contact spring applies the urging force to the central portion of the movable contact and the pair of urging force application portions applies urging force to two outer ends of the movable contact.

3. An electromagnetic contactor, comprising:
a contact mechanism having a pair of fixed contacts disposed to maintain a predetermined interval in a longitudinal direction thereof; and a movable contact disposed above the pair of fixed contacts, the movable contact contacting to and detaching from the pair of fixed contacts,
wherein each of the pair of fixed contacts has a fixed contact portion, the movable contact extends in a longitudinal direction thereof and has a pair of movable contact portions contacting the pair of fixed contacts, and the movable contact is disposed so as to move in a vertical direction thereof on a connecting shaft fixed to a movable plunger and is pressed down by an urging force of a contact spring in a downward direction thereof on a central portion of the movable contact in the longitudinal direction thereof, the movable contact being held on the connecting shaft,
a plate spring member, extending in a longitudinal direction thereof and having, in vicinities of two outer ends in the longitudinal direction of the plate spring member, a pair of urging force application portions that applies a predetermined urging force in the downward direction to the pair of movable contact portions, is attached to the connecting shaft, and
the plate spring member includes
an attachment plate portion disposed between a lower end of the contact spring and an upper surface of the movable contact and gripped between the lower end of the contact spring and the upper surface of the movable contact by the urging force of the contact spring,
a pair of inclined portions extending diagonally upward and outward from two outer ends of the attachment plate portion in a longitudinal direction thereof,
a pair of horizontal portions extending outward horizontally in the longitudinal direction of the attachment plate portion from an end portion of each of the pair of inclined portions, and
the pair of urging force application portions, standing downward from an outer end portion of each of the pair of horizontal portions in the longitudinal direction of the attachment plate portion, and applying a predetermined urging force in the downward direction to the pair of movable contact portions.

4. An electromagnetic contactor, comprising:
a contact mechanism having a pair of fixed contacts disposed to maintain a predetermined interval in a longitudinal direction thereof; and a movable contact disposed above the pair of fixed contacts, the movable contact contacting to and detaching from the pair of fixed contacts,
wherein each of the pair of fixed contacts has a fixed contact portion, the movable contact extends in a longitudinal direction thereof and has a pair of movable contact portions contacting the pair of fixed contacts, and the movable contact is disposed so as to move in a vertical direction thereof on a connecting shaft fixed to a movable plunger and is pressed down by an urging force of a contact spring in a downward direction thereof on a central portion of the movable contact in the longitudinal direction thereof, the movable contact being held on the connecting shaft,
a plate spring member, extending in a longitudinal direction thereof and having, in vicinities of two outer ends in the longitudinal direction of the plate spring member, a pair of urging force application portions that applies a predetermined urging force in the downward direction to the pair of movable contact portions, is attached to the connecting shaft, and
the plate spring member includes
an attachment plate portion disposed between an upper end of the contact spring and a C-ring attached to the connecting shaft and gripped between the upper end of the contact spring and the C-ring by the urging force of the contact spring,
a pair of inclined arm portions extending diagonally downward and outward from two outer ends of the attachment plate portion in a longitudinal direction thereof, and
the pair of urging force application portions, provided on an end portion of each of the pair of inclined arm portions, and applying the predetermined urging force in the downward direction to the pair of movable contact portions.

Assignees

• Fuji Electric Fa Components & Systems Co Ltd

Inventors

• Naka Yasuhiro
• Takaya Kouetsu
• Suzuki Kenji
• Shiba Yuji
• Takemoto Takanori

Classifications

• H01H50/60

  moving contact being rigidly combined with movable part of magnetic circuit {(for polarised relays H01H51/2254, H01H51/2281)} · CPC title

• H01H50/42

  Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement · CPC title

• H01H51/065

  Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles (details H01H50/20) · CPC title

• H01H2050/025

  containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction · CPC title

• H01H50/546 Primary

  for contactors having bridging contacts · CPC title