JPH05159678A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay having a different contact structure while having nearly the same structure as in the past. CONSTITUTION:A movable block 30 is formed by juxtaposing movable contact pieces 32, 32 on both sides of a movable iron piece 31 and integrating them in a central support base 33. By the oscillation of the movable block 30, a movable contact 36 provided on the free end part of the movable contact piece 31 is made closer to and separated from a fixed contact 49a provided on a base block 40. The base block 40 is formed by cutting a pair of lead frames consisting of a pair of contact bases 49 having fixed contacts 49a, and a pair of holding parts 48 selectively either between the contact bases 49, 49, or between the contact bases 49, 49 and between the contact part 49 and the holding part 48, and then insert-molding them on both end parts of a plate body 41. In this contact structure, thus, when the lead frame is cut in the former position, a contact 2c can be formed, and when the frame is cut in the latter position, a contact 1a or 1b can be formed.

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, as an electromagnetic relay, for example, as shown in FIG. 7, generally, a base 1, a coil block 2,
It consists of a movable block 3 and a case 4, and has a contact structure of 2
There is a c-contact.

That is, in the base 1, the common terminals 5 are integrated in the central portions on both sides, and the fixed contact pieces 7a, 7b are integrated in the four corners. Then, the welded portion 6 of the common terminal 5 and the fixed contacts 8a, 8 of the fixed contact pieces 7a, 7b.
b are exposed above the base 1.

On the other hand, a movable block 3 which is swingably arranged above the coil block 2 housed in the base 1.
The movable contact pieces 10 are arranged in parallel on both sides of the movable iron piece 9 and are integrated by the support base 13. A connecting portion 11 extends from the movable contact piece 10 to the side of the supporting base 13, and the connecting portion 11 is electrically connected to the welding portion 6 of the common terminal 5. ..

Therefore, when the coil block 2 is excited and demagnetized to swing the movable block 3, the movable contacts 12a and 12b provided at both ends of the movable contact piece 10 are alternately contacted with the fixed contacts 8a and 8b. When separated, the common terminal 5 and the fixed contact pieces 7a and 7b are alternately conducted.

[0006]

However, the electromagnetic relay can be used only for a circuit whose application requires the 2c contact, and its application range is limited. Therefore, for example, when a contact structure applicable to a large current circuit is required, there is a problem that an electromagnetic relay having a completely different structure must be newly manufactured. Therefore, an object of the present invention is to provide an electromagnetic relay in which different types of contact configurations can be obtained by only partially modifying the lead frame.

[0007]

According to the present invention, in order to achieve the above-mentioned object, movable contact pieces are arranged in parallel on both sides of a movable iron piece, and a movable block formed integrally with a central support is rocked. An electromagnetic relay in which a movable contact provided at a free end portion of the movable contact piece is brought into contact with and separated from a fixed contact provided at a base block, the base block includes a pair of contact bases having fixed contacts, and a pair of holding portions. After cutting either of the contact blocks of the pair of lead frames, or cutting off one of the contact blocks and cutting between the other contact block and the leg part, both ends of the base are selected. Are formed by insert molding.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the electromagnetic relay according to the present invention will be described with reference to FIGS. As shown in FIG. 1, this electromagnetic relay generally includes a first base block 2
0, the movable block 30, the second base block 40 serving as an insulating member, the coil block 50, and a case (not shown).

The first base block 20 is a substantially rectangular plate-like body, and pedestals 21 are provided at the four corners. A claw portion 22 is extended in each pedestal portion 21 in the directions of arrows A and A ′, and a groove portion 24 having a first guide portion 23 on a side surface of each pedestal portion 21.
Are provided, and a protrusion 24a is provided in each groove 24.

Further, common terminals 25, 25 are insert-molded in the central portions of both long side edges of the first base block 20, respectively. The upper ends of the two common terminals 25, 25 are substantially T-shaped welded portions 26 protruding from the upper surface of the first base block 20 and bent sideways. In addition,
A groove 27 is formed in the center of the upper surface of the welded portion 26 in the directions of arrows B and B '.

Further, the first base block 20 has a second guide portion 2 near both sides of the welded portions 26, 26.
8 is provided, and a pair of protrusions 29, 29 is provided at a portion located between both common terminals 25, 25. The protrusions 29, 29 are movable blocks 30 described below.
Is for preventing the connecting portion 35 from being deformed when a vertical impact load is applied.

In the movable block 30, movable contact pieces 32, one end of which is cut, are arranged in parallel on both sides of a movable iron piece 31, and are integrally formed by a support portion 33 made of a resin material.
The movable iron piece 31 has a narrow I-shape except for the both ends. On the other hand, the movable contact piece 32 is made of a conductive thin plate and is bent in a shape along the side surface of the movable iron piece 31. A so-called twin structure movable contact 34 is provided at the free end of the movable contact piece 32, and a substantially T-shaped connection portion 35 extends laterally from the support portion 33.
A recess 36 is provided at the center of the upper surface of the support portion 33 so that the upper surface of the movable iron piece 31 is exposed.

As shown in FIGS. 2 and 3, the second base block 40 is formed at both ends of a rectangular plate 41 made of an insulating resin material by changing the cutting positions of lead frames of the same shape. Holding member 42 and fixed terminal member 4
3 is insert molded.

As shown in FIG. 2, a long hole 44 extending in the directions of arrows B and B'is provided in the central portion of the plate-like body 41, and engaging groove portions 45, 45 are provided in the central portions of both short sides. Are formed respectively. Further, as shown in FIG. 3, table portions 46 are provided at the four corners of the lower surface of the plate-like body 41 so as to project therefrom.
An engaging recess 46a is formed on the side surface of the.

Both the holding member 42 and the fixed terminal member 43 are formed by changing the cutting positions of lead frames having the same shape. That is, the lead frame is
Fixed part 47 inserted into the plate-like body 41 (see FIG. 2)
A holding part 48 for holding the first base block 20 (see FIG. 3), and a contact base 49 for providing a fixed contact 49a.
It consists of and. The holding member 42 is cut off from the contact base 49, and the fixed terminal member 43 is cut off from the holding portion 48 and other portions.
Integrated into 1.

As shown in FIG. 3, the holding portion 48 extends downward from the inside of the engaging recess 46a formed in the base portion 46 of the plate-like body 41, and the extending lower end portion has the first portion. A through hole 48a that engages with the protrusion 24a of the 1 base block 20 is provided. The contact base 49 projects from both sides of the short side end of the plate-like body 41, and the fixed contact 4 is provided on the lower surface thereof.
9a is provided.

As shown in FIG. 1, in the coil block 50, one end of a substantially U-shaped iron core (not shown) is bent outward, and the permanent magnet 52 is brought into contact with the central portion of the coil block 50. The coil 54 is wound after being integrated by a spool 53 made of. Coil terminals 56, 56 are insert-molded at both upper ends of the collar portions 55, 59 formed at both ends of the spool 53, and step portions 55a, 59a are formed at the lower ends thereof. The coil terminal 5
The upper end of 6 serves as a barb 57, 57 from the coil lead wire and projects upward from the collar 55, 59 of the spool 53.

On the other hand, the leg portion 58 of the coil terminal 56 is
The intermediate portion of the adjacent coil terminals 56, 56 is insert-molded on the side plate 65 at the same time as the insert molding described above. The side plate 65 has a through hole 66 for contact follow measurement, a wide portion 67 is provided at the lower end portion, and engaging portions 67a and 67a are formed at the base portion thereof.

Before the coil terminal 56 is attached to the first coil block 20, the leg portions 58 extend in the directions of the arrows A and A'and are bent as shown in FIG. 1 at the time of attachment. Further, among the coil terminals 56, those provided on the collar portion 59 are dummies to which the coil 54 is not connected.

Next, the assembling work of the electromagnetic relay having the above construction will be described. First, while guiding the connecting portion 35 of the movable block 30 by the first guide portion 28, the connecting portion 35 is brought into contact with the welding portion 26 of the common terminal 25 so as to contact the movable block 30.
Are placed on the first base block 20. Then, by welding the connecting portion 35 and the welding portion 26, the movable block 30 is rotatably supported with the connecting portion 35 as a fulcrum.

Then, the second base block 40 is assembled to the first base block 20. In this assembly, first
Holding part (piece) 4 of holding member 42 and fixed terminal member 43
8 is pressed against the side surface of the first base block 20 and spread out, thereby elastically deforming in the directions of arrows B and B ′.
Then, the through hole 48 a provided in the holding portion (piece) 48 is engaged with the protrusion 24 a of the first base block 20 to prevent the holding portion (piece) 48 from coming off. This makes the second
The base block 40 is temporarily fixed to the first base block 20, and the second base block 40 has the first base block between the holding portion (piece) 48 and the engagement recess 46a formed behind the holding portion (piece) 48. The 20 first guide portions 23 are engaged and positioned. After that, the protrusions 24 a are caulked by heat to fix the second base block 40 to the first base block 20.

As described above, with respect to the first base block 20, the movable block 30 has its connecting portion 35 as the second guide portion 28, and the second base block 40 has its engaging concave portion 46.
Since the position of a is regulated by the first guide portion 23,
The positional relationship between the movable contact 34 and the fixed contact 49a can be set accurately.

Thereafter, the coil block 50 is attached to each member.
Before assembling, the leg portion 58 of the coil terminal 56 is in a state of extending in the directions of arrows A and A '. Therefore, first, the step portions 55a, 5 of the collar portions 55, 59 of the spool 53 are
9a is engaged with the engaging groove portion 45 of the second base block 40, and the spool 53 is positioned on the second base block 40. Then, the leg portion 58 is bent and the engaging portion 67 a of the side plate 65 is engaged with the claw portion 22 of the first base block 20 to fix the coil block 50 to the first base block 20.

In this state, the lower end surface of the permanent magnet 52 is guided by the recess 36 of the movable block 30 through the elongated hole 44 of the second base block 40, and the lower end surface of the permanent magnet 52 is movable. It contacts the movable iron piece 31 of the block 30. Also, the coil 54 and the contacts 34, 49a
Is partitioned by the plate-like body 41 of the second base block 40 and the collar portions 55, 59 of the coil block 50, and sufficient insulation is secured despite the short linear distance between the two.

Then, a non-magnetic thin plate is inserted through the through hole 66 formed in the side plate 65, and the contact follow is measured. Here, if the desired contact follow cannot be obtained, the claw portion 22 of the first base block 20.
After bending, the engagement with the engagement portion 67a of the side plate 65 is released, the coil block 50 is removed, and then the contact base 49 of the fixed terminal member 43 provided with the fixed contact 49a is deformed and adjusted.

Finally, the ceiling surface of a case (not shown) is brought into contact with the upper surfaces of the collar portions 55 and 59 of the spool 53, and the first
After fitting the base block 20 and sealing the fitted portion with a seal member, the internal gas is discharged from a gas vent hole (not shown) and heat sealed to complete the assembly work.

In the electromagnetic relay thus assembled, one end of the iron core of the coil block 50 is bent outward in the non-excited state in which no voltage is applied to the coil 54, and its area is larger than that of the other. The movable iron piece 31 is rotated to one side, and the movable contact 34 is separated from the fixed contact 49a, because the movable iron piece 31 is rotated to one side.

When a voltage is applied to the coil 54 to excite the coil block 50 from this state, the movable iron piece 31 rotates to close the movable contact 34 to the fixed contact 49a, and the common terminals 25, 25 are connected to each other. Is conducted. On the contrary, when the excitation is released, the movable iron piece 31 returns to the original position again, the movable contact 34 is separated from the fixed contact 49a, and the common terminals 25 and 25 are disconnected.

As described above, the contact structure of the electromagnetic relay is a so-called 1b contact which closes a contact of one circuit by exciting the coil block 50 from the state where the contact is normally opened. And in this electromagnetic relay, the common terminals 25, 25
Since conduction and interruption of electricity between the contacts are performed by opening and closing the contacts at two locations, the distance between the contacts can be doubled and the insulation is enhanced. However, the contact structure of the electromagnetic relay is 1
Although the contact point is the b contact point, the contact point may be a normally closed 1a contact point.

By the way, the electromagnetic relay can be made into a 2c contact by changing the design of the movable contact piece 32 and the like. That is, as shown in FIGS. 4 to 6, in the movable block 30, the central portion of the movable contact piece 32 is integrated by the support base 33, and the movable contacts 38, 38 are provided at both ends thereof.
Is provided. On the other hand, the second base block 40
The fixed contact pieces 70 are formed by cutting the contact blocks 49, 49 of the lead frame having the same shape as the electromagnetic relay, and insert-molded at the four corners of the rectangular plate 41. In the electromagnetic relay formed by using both the members, when the coil block 50 is excited and demagnetized and the movable block 30 is swung, the movable contacts 38, 38 provided at both ends of the movable contact piece 37 alternate. To and from the fixed contact 71. As described above, the 2c contact can be easily obtained only by changing the cut portion of the lead frame.

[0031]

As is clear from the above description, according to the electromagnetic relay of the present invention, the cutting positions of the lead frames serving as the movable contact piece and the fixed contact piece can be changed as appropriate so that the other constituent members can be cut. The contact structure can be easily changed without changing the design.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay having a 1a contact according to the present embodiment.

FIG. 2 is a plan view of a second base block of FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is an exploded perspective view of an electromagnetic relay having a 2c contact according to the present embodiment.

5 is a plan view of a second base block of FIG.

FIG. 6 is a front view of FIG.

FIG. 7 is an exploded perspective view of an electromagnetic relay according to a conventional example.

[Explanation of symbols]

30 ... Movable block, 31 ... Movable iron piece, 32 ... Movable contact piece, 33 ... Support part, 34 ... Movable contact point, 35 ... Connection part, 4
0 ... 2nd base block, 42 ... Holding member, 43 ... Fixed terminal member, 47 ... Fixed part, 48 ... Holding part, 49 ... Contact stand, 49a ... Fixed contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Sato 10 Odoron-cho, Hanazono-cho, Ukyo-ku, Kyoto City Kyoto Prefecture OMRON Corporation

Claims (1)

[Claims] 1. A movable contact piece is provided side by side on both sides of the movable iron piece,
An electromagnetic relay in which a movable contact provided at the free end of the movable contact piece is brought into contact with and separated from a fixed contact provided on the base block by swinging the movable block integrated with a central support base, Is cut between the contact points of the pair of lead frames consisting of a pair of contact points having fixed contacts and a pair of holding parts, or one of the contact points is cut off and the other contact point is between the legs. An electromagnetic relay characterized by being formed by insert molding at both ends of the base after selecting one of the two.