JPH05166446A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To connect accessories of action display device or the like without soldering to an electromagnetic coil. CONSTITUTION:An electronic part is mounted on a lead frame 1 of integrally molding a synthetic resin holder 3 to constitute an accessory unit 4, and a tongue piece-shaped connecting piece 1a integrally formed with the lead frame 1 is forced to be press-attached from above to a pair of relay terminals 12 secured to a coil bobbin 10. Lead wires 11a, 11b of winding start and winding end of a coil winding are respectively soldered to the relay terminals 12, and the accessory unit 4 is connected without being soldered to an electromagnetic coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay provided with an operation display device, a surge absorber, etc. as accessories.

[0002]

2. Description of the Related Art An electromagnetic relay may be equipped with an operation display device for displaying an operating state by an LED or the like, and a surge absorbing device for absorbing a surge voltage generated during self-demagnetization of coils. A surge absorbing device generally uses a diode for a DC circuit and a so-called CR circuit including a capacitor and a resistor for an AC circuit. Conventionally, the electronic components constituting the above-mentioned accessory device are mounted on a printed board, and this printed board is connected to the coil terminals by soldering.

[0003]

Conventionally, as described above, the printed board on which the electronic component is mounted is connected to the coil terminal by soldering. However, soldering is generally labor-intensive, and the flux contained in the solder causes contact failure when it adheres to the contacts, so soldering is a work that should be avoided as much as possible. Therefore, this invention eliminates the need for soldering to attach accessories,
It is an object of the present invention to provide an electromagnetic relay that saves man-hours and improves contact reliability.

[0004]

In order to achieve the above object, the present invention mounts an electronic component on a lead frame integrally molded with a holder made of synthetic resin to form an accessory unit, while a bobbin for an electromagnetic coil. A relay metal fitting is fixedly attached to the one end, and the lead wire of the coil winding is connected to one end of the metal fitting and the lead frame is connected by pressure welding. In that case, various advantages can be obtained by connecting the other end of the relay metal fitting to the coil terminal fixed to the base of the insulator by pressure contact.

[0005]

[Operation] After soldering the electronic parts to the lead frame to form the accessory unit, cleaning this and removing the flux, the accessory unit is connected to the electromagnetic coil by connecting the lead wire of the coil winding. The lead frame is connected to one end of the relay metal fitting by pressure welding. As a result, the circuit on the accessory side and the electromagnetic coil can be connected without using solder.

A coil terminal may be integrally formed on the relay metal fitting fixed to the coil bobbin. However, if the coil terminal is separated from the relay metal fitting and fixed to the base, they are connected by pressure welding at the assembly stage. The work such as winding on the bobbin and soldering the coil lead wire to the relay metal fitting can be performed without the coil terminal, which improves workability. In addition, an electromagnetic relay in which only the shape of the coil terminal is different can be obtained with one type of electromagnetic coil, which is advantageous in production management.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a rear view of the electromagnetic relay in which the accessory unit is attached, FIG. 2 is an exploded rear view illustrating the attachment of the accessory unit to the electromagnetic relay of FIG. 1, and FIG. 3 is the electromagnetic relay of FIG. 4 is an exploded perspective view of the electromagnet part in FIG. 4, FIG. 4 is a side view of the assembled state, FIG. 5 is a plan view of the lead frame of the accessory unit in FIG. 1, FIG. 6 is a perspective view of the accessory unit in FIG. 6 is a connection diagram showing a circuit configuration of the accessory unit shown in FIG. 6, and FIG. 8 is a plan view of a lead frame of another embodiment.

First, in FIG. 5, reference numeral 1 denotes a lead frame whose outline is indicated by a broken line, which is punched from the band 2 into a shape shown by a press. 1a is a lead frame 1
A pair of tongue-shaped connecting pieces integrally formed with the connecting piece 1a. The connecting piece 1a is pressed against the relay terminal of the electromagnetic coil as described later. The synthetic resin holder 3 is integrally molded as shown in the drawing while the lead frame 1 is still connected to the strip 2 at the connecting portion 2a. After that, it is separated at the connecting portion 2a, and electronic parts are mounted to form the accessory unit 4 of FIG. The recess 3c is a relief for the return spring of the movable iron piece (not shown). In the present case, the accessory unit 4 of FIG. 6 is configured as an operation display device. That is, in FIG. 5 and FIG.
5 is an LED, 6 is a resistor, 7 is a diode, 8 is a resistor,
These are connected to each other by the lead frame 1 so as to have the circuit configuration shown in FIG.

On the other hand, in FIGS. 3 and 4, reference numeral 9 is an electromagnetic coil in which the coil winding 11 is wound around the cylindrical body of the bobbin 10, and the lead wire 11a at the start of winding and the lead wire 11b at the end of winding are paired. Rod-shaped relay part 1 of the relay fitting 12 of
2a and is further soldered. The relay metal fittings 12 are embedded on both sides of the one collar portion 10a of the bobbin 10, and the connecting portion 12b on the opposite side of the relay portion 12a is formed in a bifurcated shape. The lead wires 11a and 11b are guided from the coil winding 11 to the relay portion 12a through the groove 10b of the bobbin 10.

Reference numeral 13 is a U-shaped yoke to which a round bar-shaped iron core 14 is connected. An iron core of the yoke 13 is inserted into the hole 15 of the bobbin 10 and, at the same time, the upper plate 13a is fitted into the recess 16 of the flange portion 10a, so that the yoke 13 is combined with the electromagnetic coil 9 as shown in FIG. This york 1
3 is fixed to the base 19 by a screw (not shown) screwed through the through hole 18 into the screw hole 17 of the lower leg 13b. A pair of coil terminals 20 each having a connecting portion 20a formed by bending are fixed to the upper end of the base 19, and when the yoke 13 is fixed, the connecting portion 12b of the relay terminal 12 is press-fitted into the connecting portion 20a.

The accessory unit 4 is mounted from above on the electromagnet section assembled as shown in FIG. 4, as shown in FIG. Prior to mounting the accessory unit 4, a movable iron piece (not shown) is inserted into the yoke 13, and a return spring 21 (FIG. 2) is provided between the movable iron piece and the spring receiver 13c cut and raised from the upper plate 13a. It is installed. here,
The connecting piece 1a formed on the lead frame 1 is provided with a V-shaped notch 22 at the tip and is bent upward in an inverted C shape. A pair of mounting legs 3a facing each other in a hook shape are integrally formed on both sides of the holder 3.

Therefore, when the notch 22 is aligned with the prismatic relay portion 12a of the relay terminal 12 and the inclined tip surfaces of the mounting legs 3a are applied to both sides of the yoke upper plate 13a, the accessory unit 4 is pushed in. The connection piece 1a is elastically deformed inward and pressed against the relay portion 12a, and the mounting leg 3a is elastically deformed outwardly, and then engaged with the back surface of the yoke upper plate 13a to be in the state of FIG. At that time, at the same time, the square hole 3b of the holder 3
The spring receiver 13c is press-fitted into (FIG. 6). This allows
The accessory unit 4 is electrically connected to the coil winding 11 and at the same time mechanically coupled to the yoke 13.

FIG. 8 shows an embodiment in which the connecting piece 1a has a different shape. FIG. 8A is a plan view of the lead frame 1.
(B) is an enlarged view of the connection piece 1a. In this embodiment, the connecting piece 1a is formed in a rectangular shape, and a square hole 23 having opposing projections 23a is formed in the center. When attaching the accessory 4, the projection 23a should be crushed so that the square hole 23
The relay portion 12a is pushed into the
Pressed against a.

According to the configuration described above, the accessory unit 4 in which the electronic components such as the LED 5 and the resistor 6 are soldered to the lead frame 1 can be mechanically connected to the electromagnetic coil 9 after cleaning the flux by itself. Therefore, the contacts in the main body of the electromagnetic relay are not contaminated with the flux of the solder, and the troublesome soldering work is not required, so that the number of assembling steps is reduced.

Particularly, in the illustrated structure, a relay metal fitting 12 which can be connected to the coil terminal 20 by pressure contact is fixed to the bobbin 10,
Since the coil winding is connected to the relay metal fitting 12 and the lead frame 1 of the accessory unit 4 is pressure-welded, the winding of the bobbin 10 and the soldering of the coil lead wires 3a and 3b to the relay metal fitting 12 are performed. Work on the coil terminal 20
This can be done without any marks, which facilitates these operations. Further, by only stocking one kind of electromagnetic coil 9, it is possible to freely assemble electromagnetic relays having different terminal coil 20 shapes.

[0016]

According to the present invention, an electronic component is mounted on a lead frame integrally molded with a holder made of synthetic resin to form an accessory unit, and the accessory unit is pressure-welded to a terminal fitting to which the lead wire of an electromagnetic coil is connected. The connection eliminates the need for soldering work to connect the accessories, eliminates the risk of soiling the contacts inside the electromagnetic relay body with solder flux, and requires only one touch to complete the connection.

Further, in this case, by separating the coil terminal and the relay metal fitting and connecting them by pressure welding, various works can be performed by the electromagnetic coil alone, and the workability is improved. With one type of electromagnetic coil, various electromagnetic relays having different coil terminal shapes can be obtained.

[Brief description of drawings]

FIG. 1 is a rear view of an electromagnetic relay showing an embodiment of the present invention.

FIG. 2 is an exploded view of FIG.

FIG. 3 is an exploded perspective view of an electromagnet section in FIG.

FIG. 4 is a side view of an assembled state of the electromagnet portion of FIG.

5 is a plan view of a lead frame of the accessory unit shown in FIG. 1. FIG.

FIG. 6 is a perspective view of the accessory unit in FIG.

7 is a connection diagram showing a circuit configuration of the accessory unit of FIG.

FIG. 8 shows another embodiment of the present invention, (A) is a plan view of a lead frame, and (B) is an enlarged view of a connecting piece portion thereof.

[Explanation of symbols]

 1 lead frame 3 holder 4 accessory unit 5 LED 6 resistance 7 diode 8 resistance 9 electromagnetic coil 10 bobbin 11 coil winding 11a lead wire 11b lead wire 12 relay metal fitting 13 yoke 19 base 20 coil terminal

Claims (2)

[Claims] 1. An electronic component is mounted on a lead frame integrally molded with a synthetic resin holder to form an accessory unit, and a relay metal fitting is fixed to a bobbin of an electromagnetic coil, and a lead wire of a coil winding is attached to one end thereof. An electromagnetic relay characterized in that the lead frame and the lead frame are connected by pressure welding. 2. The electromagnetic relay according to claim 1, wherein the other end of the relay metal fitting is connected by pressure welding to a coil terminal fixed to a base of an insulator.