JPS6273517A - Contact switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a contact opening/closing device applied to relays, switches, contactors, etc.

[Background technology]

In general, contact switching devices are required to take measures against contact welding due to arcs generated between contacts during opening/closing operations.

Particularly when the load includes a motor, capacitor, etc., contact welding is more likely to occur due to inrush current flowing.

By the way, by using the deflection of the leaf spring that becomes the movable contact,
Conventional hinge-type relays, which have a contact opening/closing device that relatively slides (wipes) the movable contact and the fixed contact when the contacts make contact, have the effect of cleaning the contact surface, and the wiping action destroys the 78 contacts. I can expect to do that. However, because there are limits to the amount of wiping and the wiping force, it has been difficult to shear the molten bridges on the contact surface.

On the other hand, as shown in FIG. 5, the movable contact 71 facing the fixed contact 70 is fixed to the movable contact 72, and
2 is connected to the contact holder 73 by a shaft 74, a spring 75 is compressed between the contact holder 73 and the movable contact 72,
It has been proposed that the base end of the contact holder 73 is supported by a shaft 76. According to this contact opening/closing device, the contact holder 7
3 rotates around the shaft 76 in the direction of the arrow, the movable contact 7
1 is inserted into the fixed contact 70, and when the contact holder 73 is further rotated in the same direction, the shaft 74 side of the movable contact 73 rotates around the fixed contact 70 as a fulcrum, as shown in fcl in the figure, and the movable contact 71 rolls against the fixed contact 70
While doing so, perform a wiping motion in the direction of the arrow. Therefore, even if a melted prefuge is generated between the contacts due to the arc of the contact bounce at the initial stage of contact closing (state Tbl in the same figure),
This melting bridge can be destroyed by the rotational moment caused by the rolling of the movable contact 71, and welding of the contacts can be reliably prevented.

However, this contact opening/closing device has a complicated structure on the movable contact side, increases the number of parts, and has many problems in terms of manufacturing, such as part stacking and adjustment methods.

[Purpose of the invention]

The purpose of this invention is to make it easy! It is an object of the present invention to provide a contact opening/closing device which has an elegant structure and can reliably prevent contact welding.

[Disclosure of the invention]

The present invention provides a fixed contact and a movable contact whose surfaces are formed so as to be able to roll from one contact position to another in contact with each other, and the movable contact is fixed to a tip and the movable contact is a movable contact having a base end in a rolling direction; a driving means having a rotation center on the distal end side of the movable contact and pressing an intermediate portion of the movable contact by rotation; and a movable contact. The base end of the child is elastically supported, and the movable contact is brought into contact with the fixed contact by the rotating operation of the driving means, and the movable contact is moved with the fixed contact as a fulcrum in a state of contact between the movable contact and the fixed contact. The contact return spring rotates the base end side of the contact point.

According to this invention, the movable contact contacts the fixed contact by the operation of the driving means, and after the contact, the rotary contact rolls to a contact position different from the contact position at the time of closing, thereby reliably preventing contact welding. be able to. In particular, after the movable contact comes into contact with the fixed contact, the drive direction in which the movable contact is pressed is the same as the rotation direction of the movable contact, so the driving force can be smoothly transmitted to the movable contact. Destructive ability can be improved. Further, since such operation is achieved by a movable contact and a return spring for the contact, the structure is simple and manufacturing can be facilitated.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. That is, this contact opening/closing device includes a fixed contact 1 and a movable contact 2, each of which has a surface shape that allows it to roll from one contact position to another while in contact with each other.
a movable contact 5 having the movable contact 2 fixed to a tip 3 and having a base end 4 in the rolling direction of the movable contact 2;
A driving means 7 having a rotation center 6 on the tip 3 side of the movable contact 5 and presses an intermediate portion of the movable contact 5 by rotation; and a driving means 7 that elastically supports the base end 4 of the movable contact 5. Then, the movable contact 2 is brought into contact with the fixed contact 1 by the rotation of the driving means 70, and further, with the movable contact 2 and the fixed contact 1 in contact with each other, the movable contact is moved with the fixed contact 1 as a fulcrum. The contact return spring 8 rotates the base end 4 side of the contact point 5.

The fixed contact 1 has a substantially flat surface, the movable contact 2 has a substantially hemispherical surface, and the movable contact 2 has a substantially flat surface.
(It can roll smoothly against the surface.) The fixed contact 1 is fixed to a fixed contact 9 integrally formed with a terminal 9a. iiJ moving contact r5 is rigid and formed into a long plate shape. The contact return 8 described in iii. is in the form of a long plate having four electric properties, and is bent into a substantially tJ shape as a whole, and this bending enables the rotating and rolling motions of the movable contact 5 described in iii. I have to. One end of the contact return spring 8 is 1i1
It is fixed to the base end 4 of the movable contactor 5 by caulking or the like, and the other end is fixed directly to the terminal IO. +1ij The driving means 7 is an electromagnetic device which will be described later.
It has an engagement recess 11 that engages with the movable contact 5.

FIG. 1 shows the state in which the contacts are open, and FIG. 2 shows the initial state in which the contacts are closed. At this time, the driving means 7 rotates in the direction of the arrow with respect to the rotation center 6 in FIG. The movable contact 2 contacts the fixed contact l. Contact value f of movable contact 2 contacting fixed contact 1 at this time of contact
Let it be iA.

FIG. 3 shows that the driving means 7 further rotates to push the movable contact 5, and the movable contact 5 moves to the base end of the movable contact 5 using the fixed contact 1 as a fulcrum with the movable contact 2 in contact with the fixed contact I. The 4th side rotates. At the same time, the contact return spring 8 is compressed. As a result, the movable contact 2 rolls on the fixed contact 1 and reaches the contact position A.
to the contact position B. At that time, even if contact welding occurs due to the arc generated between the contacts due to contact bounce when the movable contact 2 is closed, etc. at the contact position A, the molten bridge can be reliably destroyed by the rotational moment caused by the rolling of the movable contact 2. becomes. Further, as the contact return spring 8 is compressed and biased, contact pressure is applied between the contacts. Furthermore, in this case, since the rotation direction of the drive means 7 and the rotation direction of the movable contact 5 with the fixed contact 1 as a fulcrum are the same,
The driving force of the driving means 7 can be efficiently transmitted to the movable contact 5, and the transmission loss is extremely small compared to the case where the rotation center 6 of the driving means 7 is at a position other than the above. The breaking capacity of the molten bridge can be increased.

When the suppressing operation of the drive means 7 is released, the movable contact 5 is sequentially reversed from the state shown in FIG. 3 to the open state shown in FIG. 1 by the contact return spring 8.

FIG. 4 shows an example in which this contact switching device is applied to a relay. That is, 12 is a case, 13 is a cover, 14 is a clapper-type IT magnet device constituting the driving means 7, 15 is a yoke, 16 is a coil frame, 17 is an iron core, 18 is a coil, 19 is an armature, and 20 is the coil terminal, 22
is the return spring of the armature 19. Armature 1
9 is provided with a rotation center 6 in the form of a notch in its intermediate portion, and this rotation center 6 is rotatably connected to a pivot piece 21 at the upper end of the yoke 15. This t-magnet device 14 is connected to the case 12.
will be decorated. Further, the terminals 9a and 10 are inserted into the holes 12a in the side wall of the base 12, and the retaining part 5a formed in the middle part of the movable contact 5 is engaged with the engaging recess 11 formed in the armature 19. It matches. Therefore, when the coil 18 is not energized, the movable contact 5 is in an open position by the contact return spring 8 and the return spring 22. The coil terminal 20 is inserted into a hole 12a in a side wall of the case 12 opposite to the side where the fixed contact 9 is inserted. When the coil 18 is energized, the armature 19 is attracted to the end surface of the fixed iron core 17.

At this time, the armature 19 causes the movable contact 5 to move from FIG. 1 to FIG. 3, and the terminal 9a.

1i current will be i1N current during 10 hours.

Because of this structure, this contact switching device has the following advantages. That is, (1) By rolling the movable contact 2 after making contact with the fixed contact 1, it is possible to reliably prevent contact welding due to the arc of contact bounce.

(2) The rolling action of the movable contact 2 is realized by the movable contact 5, the contact return spring 8, and the driving means 7, so the structure is simple and easy to manufacture. (3) The contact return spring 8 is conductive. Because of this, there is no need for a connecting wire between the movable contact 5 and the terminal 12,
Therefore, the number of parts can be reduced and (H) can be easily assembled.

The surface shape of the movable contact 2 is not limited to a hemispherical surface, but may be semi-cylindrical or may have one or more corners on the surface. Further, it may be formed in the fixed contact 1 instead of the movable contact 2, or it may be formed in both the fixed contact 1 and the movable contact 2. Further, the movable contactor 5 may be formed of a temporary spring. Further, the contact return spring 8 is not limited to the shape described above, but may be bent or curved so as to be extendable and contractible, for example, so as to perform the above-described operation.

〔Effect of the invention〕

According to this invention, the movable contact contacts the fixed contact by the operation of the driving means, and after the contact, the rotary contact rolls to a contact position different from the contact position at the time of closing, thereby reliably preventing contact welding. be able to. In particular, after the movable contact comes into contact with the fixed contact, the drive direction in which the movable contact is pressed is the same as the rotation direction of the movable contact, so the driving force can be smoothly transmitted to the movable contact. Destructive ability can be improved. Furthermore, since such an operation is achieved by a movable contact and a return spring for the contact, the structure is simple and manufacturing is easy.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention in an open state;
Figure 2 is a side view of the initial state of contact closing, Figure 3 is a side view of the final contact state, Figure 4 is an exploded perspective view showing the state applied to a relay, and Figure 5 is a side view of 12 examples. . ■...Fixed contact, 2...Movable contact, 3...Tip,
4... Base end, 5... Movable contact, 6... Rotation center, 7... Driving means, 8... Contact return spring Fig. 5

Claims (1)

[Claims] A fixed contact and a movable contact each having a surface shape so as to be able to roll from one contact position to another while in contact with each other, the movable contact being fixed to a tip, and the direction in which the movable contact rolls. a movable contact having a proximal end at the movable contact; a driving means having a rotation center on the distal end side of the movable contact for pressing an intermediate portion of the movable contact by rotation; and a proximal end of the movable contact. is elastically supported, and the movable contact is brought into contact with the fixed contact by the rotating operation of the driving means, and further, with the movable contact and the fixed contact in contact, the proximal end side of the movable contact is made with the fixed contact as a fulcrum. A contact opening/closing device equipped with a contact return spring that rotates the contact.