JPH06283088A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To enable two independent electrical contacts to open and close alone by magnetizing each pole face of two armatures faced to one pole face of an electromagnetic block with different polarity. CONSTITUTION:Two armatures 5 formed like rod type out of permanent magnet are kept faced to the lower pole 2a of an iron core 2 projected from both sides of a coil bobbin 3 through the opening thereof, via an electromagnetic block 1. In this case, the two armatures 5 are freely rotatable about respective support points 5a, and magnetic poles at the side of each point 5a are magnetized to different polarity. As a result, when the direction of a current flow in a coil 4 is changed to select polarity appearing on the magnetic pole of the block 1, either one of pole faces of two armatures 5 can be selectively adsorbed to the pole of the block 1. According to this construction, two electrical contacts independent from each other can be opened and closed with a single electromagnetic relay. A compact type, therefore, can be realized and cost can be lowered, compared with a case where two electromagnetic relays are used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, two electromagnetic relays are required to drive a motor in the forward and reverse directions as in the case of driving a power window of an automobile, and two electromagnetic relays are used for such a purpose. For example, there is a relay housed in the same housing.

[0003]

However, when two electromagnetic relays are used as described above, there is a problem that the device becomes large and the cost becomes high. The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide an electromagnetic relay capable of opening and closing two electrical contacts independently of each other.

[0004]

In order to achieve the above object, the present invention provides an electromagnet block formed by winding a coil around an iron core and a permanent magnet, and the magnetic pole surface at one end is an electromagnet block. Two armatures that face the magnetic pole surface and pivotally support the other end and are rotatably provided on the electromagnet block; one end is fixed and a movable contact is provided at the free end, and the armatures are arranged in parallel with each other. The two contact springs, the movable contact provided at the free end of each contact spring, and the fixed contact that opens and closes the movable contact, and the armature corresponding to each contact spring, are provided. An electromagnetic relay is formed from the card that drives each contact spring, and the magnetic pole surfaces of the two armatures facing one magnetic pole surface of the electromagnet block are magnetized to have different polarities.

[0005]

In the structure of the present invention, the electromagnet block is formed by winding the coil around the iron core and the permanent magnet, and one end of the magnetic pole surface is opposed to the magnetic pole surface of the electromagnet block.
Two armatures pivotally mounted on the electromagnet block with the other end pivotally supported, and two contact springs fixed at one end and provided with movable contacts at the free ends and arranged in parallel with each armature, A card that is provided to face the movable contacts provided at the free ends of the contact springs and that is fixed to the movable contacts and that opens and closes to each movable contact, and to the armature that corresponds to each contact spring and that drives each corresponding contact spring. Since an electromagnetic relay is formed from and the magnetic pole surfaces of the two armatures facing one magnetic pole surface of the electromagnet block are magnetized to have different polarities, the direction of the current flowing through the coil is changed to the magnetic pole of the electromagnet block. By switching the appearing polarity, either one of the two magnetic pole faces of the permanent magnet formed by the permanent magnet is selectively attracted to the magnetic pole of the electromagnetic block, the contact spring is driven by the armature, and the movable contact spring is provided. It is to open and close the electrical contacts made of the point and the fixed contact.

[0006]

EXAMPLES The present invention will be described in detail below based on examples. FIG. 1 is a sectional view of an essential part of an electromagnetic relay according to this embodiment. A coil bobbin 3 made of an insulating material is mounted on the body of an iron core 2 having a substantially I-shaped cross section, and a coil 4 is wound around the surface of the coil bobbin 3 to form an electromagnet block 1. The coil 4 may have one turn as shown in FIG. 2 (a) or two turns as shown in FIG. 2 (b). Then, on the lower magnetic pole 2a at the end of the electromagnet block 1 and below the iron core 2 projecting from the openings on both sides of the coil bobbin 3, two armatures 5 formed in a rod shape by permanent magnets are provided. And the two ends of the armature 5 with the fulcrum 5
As a, the lower magnetic pole 2a of the iron core 2 is pivotally supported by a hinge spring 6, and the two armatures 5 are rotatable about their respective fulcrums 5a. Here, in the hinge spring 6, the spring piece 6a is formed in a substantially U-shape, the substantially center of the spring piece 6a is fixed to the bottom portion of the iron core 2, and both ends of the spring piece 6a are fixed to the respective armatures 5. There is. Further, in the two armatures 5, the magnetic poles on the side of each fulcrum 5a are magnetized to have different polarities.

A card 7 having insulating properties and provided with engaging recesses 12 is provided in each armature 5, one end of which is fixed to a terminal 9 and movable contacts 10 are provided on both front and back surfaces of the free end. The two contact springs 8 provided with are respectively locked in the engaging recesses 12 provided in the card 7. Therefore, by rotating the two armatures 5, the contact springs 8 locked to the respective armatures 5 can be driven. Furthermore, each armature 5 is
The contact springs 8 are engaged with each other and are pulled outward, that is, in a direction away from the electromagnet block 1. In addition, a pair of fixed terminals 11 are arranged for each movable contact 10 so as to face each other with the movable contact 10 sandwiched between them in the operation plane where the armature 5 rotates.

Now, when a current is passed through the coil 4 in a direction in which the upper magnetic pole 2b of the electromagnet block 1 becomes the N pole, FIG.
As shown in FIG. 5, the one of the two armatures 5 whose magnetic pole surface 5b facing the upper magnetic pole 2b of the electromagnet block 1 is magnetized to the S pole is attracted to the electromagnet block 1, The contact spring 8 locked to the armature 5 is driven, and the movable contact 10 provided on the contact spring 8 is fixed to the fixed terminal 1.
It is closed to the normally open fixed contact 11b provided on the other side of No. 1. However, since the magnetic pole surface 5b magnetized to the N pole of the other armature 5 repels the upper magnetic pole 2b of the electromagnet block 1, the movable contact 10 of the contact spring 8 locked to this armature 5 is It is closed to the normally closed fixed contact 11a.

When the current flowing through the coil 4 is turned off from this state, the armature 5 that is attracted to the electromagnet block 1 is pulled by the contact spring 8 that is locked by the armature 5 and the electromagnet is pulled. After moving away from the block 1, the movable contact 10 of the contact spring 8 closes to the normally closed fixed contact 11a.
After all, as shown in FIG. 3B, the movable contacts 10 of the contact springs 8 locked to the two armatures 5 are both closed to the normally closed fixed contact 11a.

Next, when a current is passed through the coil 4 in the direction in which the upper magnetic pole 2b of the electromagnet block 1 becomes the S pole, FIG.
As shown in FIG. 5, the armature 5 whose magnetic pole surface 5 b facing the upper magnetic pole 2 b of the electromagnet block 1 is magnetized to the N pole is attracted to the electromagnet block 1 and locked to the armature 5. The movable contact 10 provided on the contact spring 8 is closed to the normally open fixed contact 11b. On the other hand, the armature 5 whose magnetic pole surface 5b facing the upper magnetic pole 2b of the electromagnet block 1 is magnetized to the S pole receives a repulsive force from the upper magnetic pole 2b of the electromagnet block 1 and is locked to the armature 5. The movable contact 10 provided on the contact spring 8 remains closed to the normally closed fixed contact 11a.

[0011]

According to the present invention, an electromagnet block formed by winding a coil around an iron core and a permanent magnet are used. One end of the magnetic pole surface is opposed to the magnetic pole surface of the electromagnet block, and the other end is formed. Two armatures that are pivotally supported and rotatably provided on the electromagnet block, two contact springs that have one end fixed and a movable contact at the free end, and are arranged in parallel to each armature, and the freeness of each contact spring. It is provided facing the movable contact provided at the end,
An electromagnetic relay is formed from a fixed contact that opens and closes each movable contact, and a card that is provided on the armature corresponding to each contact spring and drives each corresponding contact spring, and faces one magnetic pole surface of the electromagnet block. Since the magnetic pole surfaces of the two armatures are magnetized to have different polarities from each other, by changing the direction of the current flowing in the coil to switch the polarities appearing in the magnetic poles of the electromagnet block, either of the two magnetic poles formed of permanent magnets can be used. One of the magnetic pole faces is selectively attracted to the magnetic pole of the electromagnetic block, the contact spring locked to the armature is driven, and the electric contact consisting of the movable contact and the fixed contact provided at the free end of the contact spring is opened and closed. Can be done. As a result, two independent electrical contacts can be opened and closed by one electromagnetic relay, and the electromagnetic relay can be downsized and the cost can be reduced as compared with the case of using two electromagnetic relays. .

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining a method of winding a coil around the iron core, wherein FIG. 2A is a diagram showing a case of a one-turn coil, and FIG. 2B is a diagram showing a case of a two-turn coil.

3A and 3B are diagrams illustrating the above-described operation, FIG. 3A is a diagram showing a state in which a coil current is passed in a direction in which an upper magnetic pole of an electromagnet block is an N pole, and FIG. 3B is a state in which the coil current is turned off. The figure showing the state, (c), the upper magnetic pole of the electromagnet block is S
It is a figure which shows the state which sent the coil current to the direction which becomes a pole.

[Explanation of symbols]

 1 electromagnet block 2 iron core 2a upper magnetic pole 2b lower magnetic pole 3 coil bobbin 4 coil 5 armature 5a fulcrum 5b magnetic pole surface 6 hinge spring 7 card 8 contact spring 9 terminal 10 movable contact 11 fixed terminal 11a normally closed fixed contact 11b normally open fixed contact 12 Engagement recess

Claims (1)

[Claims] 1. An electromagnet block formed by winding a coil around an iron core, and a permanent magnet. One end of the magnetic pole surface is opposed to the magnetic pole surface of the electromagnet block, and the other end is pivotally supported. Two armatures rotatably provided on the electromagnet block, one end fixed, a movable contact provided on the free end, two contact springs arranged in parallel to each armature, and the free end of each contact spring One of the electromagnet blocks is composed of a fixed contact that is provided so as to face the movable contacts and that opens and closes each movable contact, and a card that is provided on the armature corresponding to each contact spring and that drives each corresponding contact spring. An electromagnetic relay in which each magnetic pole surface of two armatures facing the magnetic pole surface is magnetized to have different polarities.