JPH05205600A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay which has contact point structure composed of 4 poles and can be manufactured by existing working line to manufacture the contact points. CONSTITUTION:A first base block 20 is formed by inserting common terminals 25a, 25b, which are divided into two along the longitudinal direction, in the center parts of both sides. A movable block 30 is composed by arranging movable contactors 32a, 32b, which are divided into two at the center, in parallel in both sides of a movable iron core 31 and movable contact points 34a, 34b are respectively installed in the upper and lower faces of the movable contactors 32a, 32b. A second base block 40 are put between the movable block 30 and a coil block 50 and a contact point stand 48b of a fixed contactor 42b is extended in U-shape and a fixed contact point 49b is installed on the opposite side of the lower face side.

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, an electromagnetic relay generally comprises, for example, as shown in FIG. 9, a first base block 1, a movable block 2, a second base block 3, a coil block 4, and a case (not shown). (See Japanese Patent Application No. 02-319922).

The first base block 1 is formed by insert-molding common terminals 6 and 6 at the central portions on both sides of a plate-like body 5. The upper ends of the common terminals 6 and 6 are bent sideways to form welded portions. It is 7,7.

In the movable block 2, movable contact pieces 9, 9 are arranged in parallel on both sides of the movable iron piece 8 and are integrated by a support base 11. The movable contact piece 9 is provided with movable contacts 10 having a so-called twin structure on the upper surfaces of both ends thereof, and a substantially T-shaped connecting portion 9a is extended from the central portion to the side of the support base 11. ing.

The second base block 3 is a plate-shaped body 12.
The fixed contact pieces 13 are insert-molded at the four corners. The fixed contact piece 13 has a contact base 14 provided with fixed contacts 14a on the lower surface from both end surfaces of the plate-shaped body 12 and protrudes from the both ends.
Legs 15 extend downward from the side surface of the plate-shaped body 12.

The coil block 4 is formed by winding a coil 17 around an iron core (not shown) via a spool 16. Collars 16 formed at both ends of the spool 16
The coil terminal 18a and the terminal member 18 are provided on a and 16b.
Each pair of b is insert molded, and simultaneously with this insert molding, the leg portions of the coil terminal 18a and the terminal member 18b are integrated with the side plate 19.

In the electromagnetic relay, the contact structure is such that the coil block 4 is excited and demagnetized to oscillate the movable block 2 so that the movable contacts 10 provided at both ends of the movable contact piece 9 alternate with the fixed contact 14a. To form a so-called 2c contact in which the common terminal 6 and each fixed contact piece 13 are alternately conducted.

[0008]

However, the electromagnetic relay can be used only in a circuit that requires the 2c contact, and its application range is limited. Therefore, when an electromagnetic relay having a four-pole contact structure such as 4a and 4b contacts is required, 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 having a 4-pole contact structure that can be manufactured by utilizing an existing processing line for manufacturing the 2c contact.

[0009]

In order to achieve the above object, the present invention integrates a common terminal formed by bending an upper end portion of a plate material at a substantially right angle in a central portion on both sides of the plate member. The first base block and the movable contact pieces are arranged side by side on both sides of the movable iron piece, and are integrated by a central support base, and the central portion of the movable contact piece is extended laterally from the central support base. By forming a connecting portion and welding the connecting portion to the upper end portion of the common terminal, a movable block disposed above the first base block and an iron core around which a coil is wound via a spool to move the movable portion. The coil block arranged above the block and fixed contact pieces are integrated at the four corners of the resin plate-like body, and the contact bases of the fixed contact pieces are brought into contact with the movable contacts provided at both ends of the movable contact piece. A fixed contact is installed so that it can be separated from the coil In the electromagnetic relay composed of the second base block arranged between the movable block and the movable block, the common terminal is divided into two in the width direction, and the movable contact piece is divided into two in the center, so that one of the two is free. On the top at the end,
While the movable contact is provided on the lower surface at the other free end, one of the contact blocks of the fixed contact piece is provided on the lower surface.
On the other hand, the edge portion is extended and fixed contacts are provided at positions facing the movable contacts provided on the lower surface of the movable contact piece so that the fixed contacts can be separated from each other.

[0010]

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 FIGS. 1 and 2, this electromagnetic relay is roughly composed of a first base block 20, a movable block 30, a second base block 40, a coil block 50, and a case 70.

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, as shown in FIG. 5, common terminals 25a and 25b divided into two are insert-molded at the central portions of both long side edges of the first base block 20,
The upper end of the welded portion 26a protrudes from the upper surface of the first base block 20 and is bent laterally.
It is 26b.

Further, the first base block 20 is provided with second guide portions 28 near both sides of the welded portions 26a, 26b, and a pair of second guide portions 28 are provided at a portion located between the common terminals 25a, 25b. The protrusions 29, 29 are provided in a protruding manner. When the movable block 30 described below receives an impact load in the vertical direction, the protrusions 29, 29 are connected to each other by the connecting portion 3.
This is for preventing the deformation of 5a and 35b.

In the movable block 30, movable contact pieces 32a and 32b, which are divided into two in the central portion, are arranged in parallel on both sides of the movable iron piece 31, respectively (see FIG. 6), and a support portion 3 made of a resin material is provided.
It is the one integrated by molding in 3. The movable iron piece 31 has a substantially I-shape with a narrow intermediate portion. On the other hand, the movable contact pieces 32a and 32b are made of a conductive thin plate and are bent in a shape along the side surface of the movable iron piece 31. A movable contact 34a is provided on the upper surface of the free end of the movable contact piece 32a, and a movable contact 34b is provided on the lower surface of the free end of the movable contact piece 32b in a so-called twin structure. And
From the movable contact pieces 32a, 32b, connecting portions 35a, 35b projecting from the side surface of the supporting portion 33 respectively extend (see FIG. 6), and further, their tips extend in opposite directions. .. An opening 36 is provided at the center of the upper surface of the support portion 33, and the upper surface of the movable iron piece 31 is exposed.

As shown in FIGS. 7 and 8, the second base block 40 is formed by insert-molding fixed contact pieces 42a and 42b at four corners of a rectangular plate 41 made of an insulating resin material. .. A long hole 43 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 44, 44 are formed in the central portions of both short sides (see FIG. 7). .. Further, a base portion 45 is projectingly provided at four corners of the lower surface of the plate-like body 41, and engaging recesses 45a are formed on an outer surface of the base portion 45 (see FIG. 8).

Legs 46 of the fixed contact pieces 42a, 42b
a and 46b are, as shown in FIG.
Through the through hole 47 in the upper part.
Is provided. Further, the contact bases 48a and 48b of the fixed contact piece 42a project from the end surfaces of the plate-like body 41 on the short side in the directions of arrows A and A ', respectively. A fixed contact 49a is provided on the lower surface of the contact base 48a. On the other hand, the contact base 48b has a side edge extending downward, is bent and has a substantially U-shaped cross section, and a fixed contact 49b is provided on the lower inward surface.

As shown in FIG. 1, in the coil block 50, one end of a substantially U-shaped iron core (see FIG. 2) is bent outward, and a 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 56a and terminal members 56b 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 upper end portion of the coil terminal 56a is a barb 57, 57 of the coil lead wire.
It projects upward from the collar portions 55, 59 of the. The terminal member 56b has the same structure as the coil terminal 56a, but is used only for positioning when mounting on the printed circuit board.

On the other hand, the leg portions 58 of the coil terminal 56a and the terminal member 56b are insert-molded into the side plate 65 at the same time as the above-mentioned insert molding. 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.

Next, the assembling work of the electromagnetic relay having the above construction will be described. First, the connecting portions 35a and 35b of the movable block 30 are guided by the first guide portion 28 and brought into contact with the welding portions 26a and 26b of the common terminals 25a and 25b, respectively, and the movable block 30 is mounted on the first base block 20. Place. Then, the connection parts 35a, 3
5b and the welded portions 26a and 26b are welded to each other to connect the movable block 30 to the connection portions 35a and 3a.
It is rotatably supported with 5b as a fulcrum.

Then, the second base block 40 is assembled to the first base block 20. In this assembly, first
The leg portions 46a and 46b of the fixed contact pieces 42a and 42b are first
The base block 20 is elastically deformed in the directions of arrows B and B ′ by pressing it against the side surface of the base block 20 and spreading it. And
The through holes 47 provided in the leg portions 46a and 46b are formed in the first
The leg 4 is engaged with the protrusion 24a of the base block 20.
Prevent 6a and 46b from coming off. As a result, the second base block 40 is temporarily fixed to the first base block 20,
The second base block 40 includes the legs 46a, 46.
b and the engaging recess 45a formed behind it,
The first guide portion 23 of the first base block 20 is 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.

Thus, with respect to the first base block 20, the movable block 30 has its connecting portions 35a and 35b as the second guide portion 28, and the second base block 40 has its engaging recess 45a as the first guide portion. 23, the movable contacts 34a, 34b and the fixed contacts 49a,
The positional relationship with 49b can be set accurately.

Then, the coil block 50 is attached to each member.
Before the assembly, the coil terminals 56a and the leg portions 58 of the terminal members 56b are in a state of extending in the directions of arrows A and A '. Therefore, first, the collar portion 5 of the spool 53
The step portions 55a and 59a of 5, 59 are engaged with the engaging groove portions 44 of the second base block 40, and the spool 53 is positioned on the second base block 40. And the leg 5
8 is bent, the engaging portion 67a of the side plate 65 is engaged with the claw portion 22 of the first base block 20, and the coil block 50 is fixed to the first base block 20.

In this state, the lower end surface of the permanent magnet 52 is guided by the opening 36 of the movable block 30 through the long hole 43 of the second base block 40, and the lower end surface of the permanent magnet 52 is moved to the movable block. It is attracted to the movable iron piece 31 of 30. Further, the coil 54 and the contacts 34a, 34
b, 49a, and 49b are partitioned by the plate-like body 41 of the second base block 40 and the flange portions 55 and 59 of the coil block 50, so that they are sufficient even though the linear distance between them is short. Insulation is secured.

Then, a non-magnetic thin plate is inserted from the through hole 66 formed in the side plate 65, and contact follow is measured. Here, if the desired contact follow cannot be obtained, the claw portion 22 of the first base block 20 is bent to release the engagement with the engagement portion 67a of the side plate 65, and the coil block 50 is removed. After the removal, the contact bases 48a and 48b provided with the fixed contacts 49a and 49b are deformed and adjusted.

Finally, the ceiling surface of the case 70 is spooled 5
3 is brought into contact with the upper surfaces of the flange portions 55 and 59 of the third fitting portion, fitted into the first base block 20, and the fitting portion is sealed with a sealing member 71, and then internal gas is discharged from the gas vent hole 72 to perform heat sealing. By doing so, the assembly work is completed.

In the electromagnetic relay thus assembled, one end of the iron core 51 of the coil block 50 is bent outward, and its area is the other when the coil 54 is in a non-excited state with no voltage applied. The movable iron piece 31 is rotated in the clockwise direction in FIG. 2 because it is widened and the magnetic balance is lost, and the movable contacts 34a and 34b are rotated.
Are separated from the fixed contacts 49a and 49b.

When a voltage is applied to the coil 54 to excite the coil block 50 from this state, the movable iron piece 31 rotates and the movable contacts 34a and 34b are closed to the fixed contacts 49a and 49b. Thereby, conduction between the common terminals 25a, 25b and the fixed contact pieces 42a, 42b is achieved via the movable contact pieces 32a, 32b. That is, it is possible to open and close the contacts at four locations at once. On the contrary, when the excitation is released, the movable iron piece 31 returns to its original position, and the movable contacts 34a and 34b move to the fixed contacts 49a and 49b.
The common terminals 25a and 25b and the fixed contact pieces 42a and 42b are disconnected from each other.

As described above, the electromagnetic relay is a so-called 4a contact that can simultaneously conduct four circuits based on the excitation and demagnetization of the coil block 50 from the normally open state. Of course, it is also possible to use this contact structure as a 4b contact that opens from the normally closed state.

Moreover, the electromagnetic relay can be easily manufactured by slightly modifying the processing line of the contact structure having the 2c contact structure shown in FIG. That is, the common terminals 25a and 25b are
It can be manufactured simply by adding the process of dividing into two in the center. Further, the movable contact pieces 32a and 32b are added with a step of dividing the movable contact piece 9 into two at the center in the processing line of the movable contact piece 9.
It is only necessary to make 0 the lower surface of the free end. Furthermore, the fixed contact pieces 42a and 42b need only change the punching shape of the fixed contact piece 13 by pressing. Then, in this case, each component can be insert-molded by using the same mold. In other words, in the same processing line,
It can be easily manufactured by slightly changing the manufacturing process of each component. Of course, the coil block 50
And the movable iron piece 31 remains as it is, and the magnetic circuit does not change at all.

[0030]

As is apparent from the above description, according to the electromagnetic relay of the present invention, the contact terminals of the common terminal, the movable contact piece and the fixed contact piece of the electromagnetic relay having a contact structure of 2c are formed. The contact structure can be changed to 4a with a slight change.
Since the contact point or the 4b contact point is used, it is not necessary to newly provide a processing line by adding a slight modification to the processing line which has been conventionally used, and no extra cost is required.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay having a 4a contact according to the present embodiment.

FIG. 2 is a front view of the electromagnetic relay shown in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a side view of FIG.

FIG. 5 is a partial perspective view of a first base block.

FIG. 6 is a partial perspective view of a movable block.

FIG. 7 is a plan view of a second base block.

FIG. 8 is a front view of FIG. 7.

FIG. 9 is an exploded perspective view of an electromagnetic relay having a 2c contact.

[Description of Reference Signs] 20 ... First base block, 25a, 25b ... Common terminal, 30 ... Movable block, 31 ... Movable iron piece, 32a, 3
2b ... Movable contact piece, 33 ... Support part, 34a, 34b ... Movable contact, 35a, 35b ... Connection part, 40 ... Second base block, 42a, 42b ... Fixed contact piece, 48a, 48b
... Contact blocks, 49a, 49b ... Fixed contacts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Nakanishi, Omron Co., Ltd. 10 Hanazono Dodo-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture

Claims (1)

[Claims] 1. A first base block in which a common terminal formed by bending an upper end of a plate material at a substantially right angle is integrated with central portions on both sides of a plate-like body, and movable contact pieces on both sides of a movable iron piece. Are arranged side by side and are integrated by a central support base, and the central part of the movable contact piece is extended laterally from the central support base to form a connection part, and the connection part is formed at the upper end of the common terminal. A movable block disposed above the first base block by welding to the portion, a coil block wound around an iron core via a spool, and disposed above the movable block; Fixed contact pieces are integrated at the four corners of the body, and fixed contact points are provided on the contact bases of the fixed contact pieces so as to face the movable contacts provided at both ends of the movable contact piece so that the fixed contact pieces can come into contact with and separate from each other. A second base plate arranged between the movable block and the movable block. In an electromagnetic relay configured with a lock, the common terminal is divided into two in the width direction, the movable contact piece is divided into two in the center, and one free end portion is an upper surface, and the other free end portion is a lower surface. While each movable contact is provided, one of the contact bases of the fixed contact piece has a lower surface and the other has an edge portion extended to face the movable contact provided on the lower surface of the movable contact piece so as to be contactable and separable. An electromagnetic relay characterized by having a fixed contact at each position.