JPH0234407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electromagnetic relay having a so-called flap type or hinge type armature whose base end is hinged to a yoke.

[Background technology]

The movable contact plate in this type of electromagnetic relay is generally made of an elastic material, has a movable contact at its distal end, and is attached to an armature at its proximal end. Therefore, even if the armature operates with the fixed contact and movable contact welded together, the driving force of the armature that acts to separate the weld is absorbed by the elasticity of the movable contact plate and makes little contribution to separating the weld. It was hot.

[Purpose of the invention]

The present invention was made in view of the above reasons, and
The purpose of this is that when the armature operates with both fixed and movable contacts welded together, the driving force of the armature efficiently contributes to separating the welds.
An object of the present invention is to provide an electromagnetic relay that can have a long switching life.

[Disclosure of the invention]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 is a yoke, which includes a lower piece 1a, a vertical middle piece 1b, and an upper piece 1.
It is formed in a U-shape at c, and the lower piece 1a is fixed to the base 2. A base end portion of a fixed iron core 4 around which a coil 3 is wound is joined to the vertical middle piece 1b by caulking or the like.

Reference numeral 5 denotes a flapper type armature, the base end 5a of which is hinged to the upper piece 1c of the yoke so that when the coil 3 is excited, the tip 5b is attracted to the front end surface of the fixed iron core 4, and the coil 3 is demagnetized. The return spring 6 is arranged so that the tip part separates from the tip surface of the fixed iron core 4 when
It is spring biased. This return spring 6 is
A coiled tension spring is used to tension and suspend between the base end 5a of the armature and the upper piece 1c of the yoke.

A frame 7 is molded from an insulating material such as resin and is provided on the armature 5. The details of this frame 7 will be described later.

Reference numerals 13, 13 designate fixed contacts, which are provided facing each other on fixed contact plates 12, 12, which are fixed through the base 2 so as to face each other at a predetermined interval.

8 is a movable contact plate with fixed contacts 13, 1 on the tip side.
A movable contact 11 that moves toward and away from the armature 3 is provided, and the proximal end is attached to the armature 5 via a frame 7, which will be described later, and basically responds to the movement of the armature 5.
Both contacts 11 and 13 are brought into contact and separation. More specifically, the distal half 8b provided with at least the movable contact 11 is formed to have a sufficiently thick plate to have rigidity, and the proximal half 8a is formed as a spring plate 9 to have elasticity. There is.

The frame 7 includes opposing pieces 7a, 7a and a connecting piece 7b.
The spring plate 9 of the movable contact plate described above is attached so as to pass through the approximate center of the connecting piece 7b. This attachment is done by simultaneous integral molding or press fitting. And movable contact 1
One opposing piece 7a is attached to the armature 5 so that the armature 1 can move toward and away from the fixed contacts 13, 13.

Furthermore, the frame 7 has protruding pieces 7c, 7c that protrude inward at the tips of both opposing pieces 7a, 7a. These protruding pieces 7c, 7c normally do not contact the movable contact plate 8 (more specifically, the tip half 8b), but when the armature 5 operates with both contacts 11, 13 welded together, The movable contact plate 8 is formed at such intervals that it contacts the movable contact plate 8.

As a result, the movable contact plate 8 is formed to have rigidity and is insulatively and elastically attached to the armature 5.

FIG. 4 shows another embodiment of the invention,
This embodiment differs from the previous embodiment mainly in the shape of the movable contact plate and the structure for attaching it to the frame. Therefore, members that are substantially the same as those in the previous embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The movable contact plate 8 of this device is formed to have rigidity as a whole, and its base end 8a is provided with a through hole 7 provided in the connecting piece 7b of the frame 7 with a margin.
d is inserted. Further, a pin 14 passing through both opposing pieces 7a, 7a and the movable contact plate 8 is attached to the armature 5.
Fixed. In this case, the movable contact plate 8 is provided with a through hole having a diameter sufficiently larger than that of the pin 14. A coiled spring 1 guided by a pin 14 is installed between the movable contact plate 8 and both opposing pieces 7a, 7a.
0 and 10 are compressed and suspended, and the movable contact plate 8 is held between them.

Therefore, this movable contact plate 8 is also formed to have rigidity and is insulatively and elastically attached to the armature 5.

In addition, in the case of a contact type in which the fixed contact 13 exists only on either side, the opposing piece 7 of the frame 7
Corresponding to this, a may also be set to only one side.

〔motion〕

Next, the opening and closing operations of both contacts 11 and 13 will be explained.

Figure 3 A shows that the coil 3 is excited and the armature is 5.
The tip portion 5b of is attracted to the tip surface of the fixed iron core 4,
The movable contact 11 is in contact (closed) with the fixed contact 13 on the right side.

When the coil 3 is demagnetized in this state, the tip 5b of the armature 5 is no longer attracted to the tip surface of the fixed iron core 4, and therefore the tip 5b of the armature 5 is moved to the tip of the fixed iron core 4 by the spring force of the return spring 6. Moving away from the surface, the movable contact 11 contacts (closes) the fixed contact 13 on the left side.

Furthermore, when the coil 3 is demagnetized when both the contacts 11 and 13 are welded together in the state shown in FIG. However, the tip half 8b of the movable contact plate 5 tries to maintain the previous state, and the protruding piece 7 of the opposing piece 7a on the right side of the frame 7
c, hits the tip half 8b hard, as shown in FIG. 3B. Since this tip half portion 8b has rigidity, the driving force of the armature 5 applied by the spring force of the return spring 6 is applied to the movable contact plate 8.
It efficiently contributes to separating the weld without being absorbed by the weld. Therefore, as shown in FIG. 3C, the movable contact 11 opens (closes) from the fixed contact 13 on the right side and contacts (closes) the fixed contact 13 on the left side.
do.

Also, in the embodiment shown in FIG. 4, substantially the same operation is performed.

Note that when welding occurs in the state shown in FIG. 3C, the driving force of the armature 5 applied by the suction force of the fixed iron core 4 acts in the same manner. The force for separating such welded contacts can be increased by increasing the spring force of the return spring 6 and the suction force of the fixed core 4. Furthermore, if the movable contact plate 8 is slightly pushed into the protruding piece 7c of the frame 7 in the states shown in FIG. 3 A and C,
It is also possible to increase the contact pressure and wiping amount,
This will also contribute to improving the contact points and contact reliability.

〔Effect of the invention〕

Since the electromagnetic relay of the present invention is constructed as described above, when the armature operates with both fixed and movable contacts welded together, the driving force of the armature efficiently contributes to separating the welds and pulls them apart. This makes it easy to use, and the opening/closing life can be extended.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is an exploded perspective view thereof, and Fig. 3 A, B, and C are
FIG. 4 is a front view showing another embodiment of the present invention. 1... Yoke, 2... Base, 3... Coil,
4... Fixed iron core, 5... Armature, 5a... Base end, 5b... Tip, 6... Return spring, 7... Frame, 7a... Opposing piece, 7b... Connection piece, 7c
...Protruding piece, 8...Movable contact plate, 8a...Proximal side half, 8b...Distal side half, 9...Spring plate, 11
...Movable contact, 12...Fixed contact plate, 13...Fixed contact.

Claims (1)

[Claims] 1. A yoke formed by joining the proximal end of a fixed core around which a coil is wound, and a base such that the distal end is attracted to the distal end surface of the fixed core when the coil is excited. a fixed contact;
In an electromagnetic relay comprising a movable contact plate that is provided with a movable contact that connects and separates from a fixed contact and responds to the movement of an armature, the movable contact plate is formed to have rigidity and is insulatively and elastically attached to the armature. 1. An electromagnetic relay characterized in that the armature is provided with a frame that hits the movable contact plate hard when the armature operates with both the contacts welded together.