Electromagnetic relay

Patent metadata

Field	Value
Publication number	US-9793078-B2
Application number	US-201514609506-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Feb 19, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

An electromagnetic relay includes: an electromagnet; a twin contact set that includes first twin contacts provided on a first movable spring, and second twin contacts that are provided on a first fixed contact plate and disposed opposite to the first twin contacts; a single contact set that includes a first single contact provided on a second movable spring, and a second single contact that is provided on a second fixed contact plate and disposed opposite to the first single contact; and a card that moves in response to excitation or non-excitation of the electromagnet, and moves the first and the second movable springs simultaneously with the movement of the card.

First claim

What is claimed is:

1. An electromagnetic relay comprising:
a base;
an elongated electromagnet having first and second opposite longitudinal sides, and first and second opposite ends;
a movable card spaced from and substantially parallel to the base and having first and second opposite longitudinal sides corresponding to the longitudinal sides of the electromagnet, and first and second opposing ends,
wherein the electromagnet is positioned between the base and the card;
a plurality of first projections that are arranged in a row along a longitudinal direction of the electromagnet, each first projection extending from the base toward the card and being positioned at the first longitudinal side of the electromagnet;
a plurality of second projections that are arranged in a row along the longitudinal direction of the electromagnet, each second projection extending from the base toward the card and being positioned at the second longitudinal side of the electromagnet;
an armature that is opposite to the first end of the electromagnet, has one end rotatably fixed to the base, a second end, and is attracted by an electromagnetic force of the electromagnet;
a return spring that is opposite to the second end of the electromagnet, and has a first end fixed directly to the base and a second end received by the card,
wherein the card is biased toward the armature by the return spring;
a twin contact set positioned at the first longitudinal side of the electromagnet and including first twin contacts provided on a first movable spring having a first end received in the base and a second end received in the first longitudinal side of the card, and second twin contacts that are provided on a first fixed contact plate received in the first projection, the second twin contacts being disposed opposite to the first twin contacts; and
a single contact set positioned at the second longitudinal side of the electromagnet and including a first single contact provided on a second movable spring having a first end received in the base and a second end received in the second longitudinal side of the card, and a second single contact that is provided on a second fixed contact plate received in the second projection and that is disposed opposite to the first single contact,
wherein the card moves parallel to the base via the armature being responsive to excitation of the electromagnet, and simultaneously moves the first and the second movable springs received therein.

2. The electromagnetic relay as claimed in claim 1 , further comprising:
a third movable spring received by the base and having third twin contacts thereon and facing the first fixed contact plate having fourth twin contacts thereon; and
a fourth movable spring received by the base and having a third single contact thereon and facing the second fixed contact plate having a fourth single contact thereon;
wherein the first and third twin contacts on the first and third movable springs, respectively, and the second and fourth twin contacts on the first fixed contact plate form a first normally-on switch and a first normally-off switch,
the first and third single contacts on the second and fourth movable springs and the second and fourth single contacts on the second fixed contact plate form a second normally-on switch and a second normally-off switch, and
the first normally-off switch and the second normally-off switch are simultaneously turned on in response to the excitation of the electromagnet, and the first normally-on switch and the second normally-on switch are simultaneously turned on in response to de-excitation of the electromagnet.

3. The electromagnetic relay as claimed in claim 2 , wherein the card includes a plurality of projections extending along the first and second longitudinal sides thereof, and
wherein the first, second, third and fourth movable springs contact, respectively, one of the plurality of projections, respectively, and follow the movement of the card.

4. The electromagnetic relay as claimed in claim 1 , wherein each of the movable springs includes two spring elements on which the twin contacts are provided, respectively.

5. The electromagnetic relay as claimed in claim 4 , wherein the base includes holes adjacent one of the first projections and one of the second projections for receiving, respectively, the first ends of each of the movable springs therein.

6. The electromagnetic relay as claimed in claim 5 , wherein each of the movable springs includes a first stopper that limits insertion of each of the movable springs into each of the holes.

7. The electromagnetic relay as claimed in claim 4 , wherein a cut is formed between the spring elements.

8. The electromagnetic relay as claims in claim 5 , wherein each of the movable springs is bent near the first stopper so as to extend closer to the respective fixed contact plate.

Assignees

• Fujitsu Component Ltd

Inventors

• Takahashi Katsuyuki
• Kurata Yoshinori
• Kitajima Daishi

Classifications

• H01H50/56 Primary

  Contact spring sets · CPC title

• H01H50/642

  intermediate part being generally a slide plate, e.g. a card · CPC title

• H01H50/042

  Different parts are assembled by insertion without extra mounting facilities like screws, in an isolated mounting part, e.g. stack mounting on a coil-support · CPC title

• H01H1/26

  with spring blade support · CPC title