JPH0520955A - Contact point switching device - Google Patents

Abstract

PURPOSE:To more securely operate an arc contact which is closed first and opened later. CONSTITUTION:A contact switch is provided with a contact switch is provided with a fixed contact plate 1 having a main contact 2 on a fixed side, and a movable contact plate 6 for supporting the base end of a main contact spring 4 having a main contact 5 on a movable side in the vicinity of a free end. An arc contact spring 7 having an arc contact 8 on the movable side in the vicinity of the free end is supported at the base end thereof on the fixed contact plate 1 in parallel to the main contact spring 4. The arc contact 6 on the fixed side is disposed in a movable contact plate 3. The main contact spring 4 is positioned near the free end while the arc contact spring 7 is located near the base end with respect to a relative drive position 9a in the longitudinal direction of the contact springs of a drive member 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact switchgear suitable for an electromagnetic relay or the like having a main contact spring having a main contact and an arc contact spring having an arc contact.

[0002]

2. Description of the Related Art As this type of contact opening / closing device, there is one having a structure shown in FIG. In the figure, A is a fixed contact plate with a fixed main contact B with excellent contact stability and a fixed arc contact C with excellent welding resistance, and D is a movable main contact E with excellent contact stability near the free end. A movable contact plate that supports the base ends of the main contact spring F with the contact point spring F and the movable contact arc contact G with excellent welding resistance near the free end, and J is the main contact points B and E. And arc contact C,
It is a driving member that drives the double contact springs F and H to open and close the Gs. In this case, the contact spring H for arc is
It is bent so that the vicinity of the free end is close to the fixed contact plate A. As a result, when the driving member J is not driving both contact springs F and H, the distance between the arc contacts C and G is mainly. Contact B,
It is smaller than the distance between E. K is an equipment base through which the fixed contact plate A and the movable contact plate D are fixed.

Such a contact opening / closing device is shown in FIGS.
As shown in (d), when the driving member J drives both contact springs F and H, the arc contacts C and G are first closed, and then the main contacts B and E are closed. Further, in the case of the reverse operation, when the driving member J returns, the main contacts B and E are opened first, and then the arc contacts C and G are opened. Therefore, the arc generated during the contact opening / closing operation is borne by the arc contacts C and G, which have excellent welding resistance, and the main contacts B and E, which have excellent contact stability when the contacts are closed, exert their function.

[0004]

The above-mentioned conventional one can improve the welding resistance performance and the contact stability performance, but when the size is reduced and the distance between the contacts is reduced,
It becomes difficult to guarantee the operation of the arc contacts that are first closed and then opened. For example, set the distance between arc contacts to 0.
If you want to make the contact stroke as small as possible by securing 5 mm,
It is desirable to keep the distance between the main contacts to about 0.7 mm at most, but then the difference between the distances between the two contacts will be 0.2 mm, making dimensional control extremely difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a contact opening / closing device capable of more reliably operating an arc contact that is first closed and later opened. is there.

[0006]

In order to solve the above problems, a contact switchgear according to the present invention comprises a fixed main contact, a fixed arc contact, and a movable main contact near the free end. A main contact spring supported by, and an arc contact spring having a base end supported by providing a movable side arc contact near the free end,
In a contact opening / closing device having a driving member that drives both contact springs to open and close the main contacts and the arc contacts, a main contact spring is provided with respect to a relative driving position of the contact members in the longitudinal direction. Is set near the free end, and the contact spring for arc is set near the base end.

In addition to the fixed contact plate provided with the fixed main contact and the movable contact plate supporting the base end of the main contact spring provided with the movable main contact near the free end, the fixed contact plate is provided near the free end. It is preferable that an arc contact spring provided with a movable side arc contact is arranged in parallel with the main contact spring, the base end thereof is supported by a fixed contact plate, and the fixed side arc contact is provided on the movable contact plate.

[0008]

According to this structure, if the distance between the main contacts and the distance between the arc contacts are made approximately the same, the arc contact spring is driven by the drive member at a position near the base end, so that the movable arc is moved. The displacement speed of the working contact becomes higher than the displacement speed of the movable-side main contact, so that the arc contacts are surely closed first and opened later.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 is a fixed contact plate, which is a base 11 for an electromagnetic relay or the like.
The end of the flat portion 1a on the instrument base side is bent into an L shape to form a flat portion 1b on the tip side. Reference numeral 2 denotes a fixed-side main contact, which is made of a material such as a silver-based material having low resistance and excellent contact stability, and is provided on the tip side flat portion 1b by caulking or welding.

Reference numeral 3 denotes a movable contact plate, which is separated from the fixed contact plate 1 by a predetermined distance and is located substantially in the same plane as the flat portion 1b on the tip side and fixedly penetrated through a base 11 such as an electromagnetic relay.
Reference numeral 4 denotes a main contact spring, which has a long plate shape extending from the movable contact plate 3 to the fixed contact plate 1, and has a base end supported by the movable contact plate 3 by caulking or welding. 5 is the movable side main contact, which is made of a material with low resistance and excellent contact stability, and is caulked or welded near the free end of the movable contact plate 3 so that it can be opened and closed with the fixed side main contact 2. And so on. In the normal state, the main contact spring 4 is preliminarily bent near the base end so that the movable main contact 5 maintains a constant contact distance with respect to the fixed main contact 2.

Reference numeral 6 denotes a fixed side arc contact, which is formed of a material having excellent welding resistance such as tin or tungsten, and is provided on the movable contact plate 3 located closer to the equipment base 11 than the main contact spring 4. is there. 7 is an arc contact spring, which is also a movable contact plate 3
The fixed contact plate 1 has a long plate shape, and the base end is supported on the fixed contact plate 1 by caulking or welding. Numeral 8 is a contact for the movable side arc, which is made of a material with excellent welding resistance and is caulked or welded near the free end of the contact spring 7 for the arc so that it can be opened and closed with the contact 6 for the fixed side arc. And so on. In the normal state, the contact spring for arc 7 has the contact 8 for movable arc and the contact for fixed arc.
Constant contact distance for 6 (similar to main contact distance)
The whole is made substantially flat so as to ensure.

Reference numeral 9 denotes a driving member called a card, which is made of an insulating material such as plastic and is arranged so as to respond to a movable member (not shown) of the electromagnet device. The drive member 9 has a linear drive surface 9 that overlaps the contact springs 4 and 7.
Therefore, the contact springs 4 and 7 are driven in response to the driving member of the electromagnet device, thereby opening / closing the main contacts 2 and 5 and the arc contacts 6 and 8. What is important about this drive member 9 is the relative drive position of the two contact springs 4, 7 in the longitudinal direction (the position of the drive surface 9a) .The main contact spring 4 is closer to the free end, and the arc contact spring 7 is That is, it is set near the base end.

Such a contact switching device is shown in FIGS. 2 (a) to 2 (e).
It operates as shown in. (a) is a normal state in which the driving member 9 is not related to both contact springs 4 and 7, that is, the contact is open, and the main contacts 2 and 5 and the arc contacts 6 and 8 are substantially the same contact. They are facing each other with a distance. Next, when the drive member 9 is displaced in response to the movable member of the electromagnet device, the drive surface 9a first contacts the arc contact spring 7 as shown in (b). When the drive member 9 is further displaced, the driving position of the arc contact spring 7 is closer to the base end, so the movable side arc contact 8 is rapidly displaced and contacts the fixed side arc contact 6 as shown in (c). To do. When the drive member 9 is further displaced,
The drive surface 9a comes into contact with the main contact spring 4, and the movable side main contact 5 comes into contact with the fixed side main contact 2 as shown in (d). in this case,
Since the drive position of the main contact spring 4 is closer to the free end, the movable main contact 5 is not displaced as rapidly as the movable arc contact 8. (e) is the maximum drive position of the drive member 9, that is, the contact is closed, and the main contacts 2 and 5 and the arc contacts 6 and 8 are both stationary by wiping. When returning from the contact closed state to the contact opened state, (e) to
It operates in the order of (a).

3 and 4 show an electromagnetic relay in which the above-mentioned contact switching device is partially modified and incorporated. Reference numeral 11 is a base of the electromagnetic relay, in which the fixed contact plate 1, the movable contact plate 3, the fixed contact plate 12 of the auxiliary contact block, the movable contact plate 13, the coil terminal 14 of the electromagnet device, etc. are fixedly mounted. The electromagnet device includes a yoke 15 having a central leg piece and an opposing leg piece, a coil 17 wound around the central leg piece via a coil frame 16, a driving member 9 rotatably supported by the coil frame 16, and an armature piece. And a movable member 18 made of a permanent magnet, etc., and is mounted and fixed on the table 11. Reference numeral 19 is a cover of the electromagnetic relay.

The present invention can be variously modified. That is, in the embodiment, the fixed contact plate 1 has been described as being bent on the end side, but the driving surface 9a of the driving member 9 may be provided with a step to omit the bending. Further, the main contact spring 4 and the arc contact spring 7 are not limited to being arranged in parallel, but the main contact spring 4 and the fixed side related thereto are provided on both sides in the rotation direction of the drive member 9 in the example applied to the electromagnetic relay. Element,
The arc contact spring 7 and the fixed member related thereto may be separately arranged.

[0017]

In the contact opening / closing device of the present invention, if the distance between the main contacts and the distance between the arc contacts are set to be approximately the same, the arc contact spring is driven by the drive member at a position closer to the base end. , The displacement speed of the movable side arc contact is higher than the displacement speed of the movable side main contact, so the operation of the arc contact that is closed first and opened later can be performed more reliably, and the electromagnetic contactor, electromagnetic relay, etc. It can be made smaller.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

2A to 2E are explanatory views schematically showing the operation.

FIG. 3 is a perspective view of an electromagnetic relay to which an embodiment of the present invention is applied.

FIG. 4 is an exploded perspective view thereof.

FIG. 5 is a perspective view of a main part of a conventional example.

6A to 6D are explanatory diagrams schematically showing the operation.

[Explanation of symbols]

1 Fixed contact plate 2 Fixed side main contact 3 Moving contact plate 4 Main contact spring 5 Movable side main contact 6 Fixed side arc contact 7 Arc contact spring 8 Contact for movable side arc 9 Drive member 11 Electromagnetic relay base

Claims (2)

[Claims] 1. A fixed-side main contact, a fixed-side arc contact, a movable-side main contact provided near the free end, a main-contact spring having a base end supported, and a movable-side arc contact provided near the free end. In a contact switching device having an arc contact spring whose base end is supported, and a drive member that drives both contact springs to open and close the main contacts and the arc contacts, the length of both contact springs of the drive member is increased. The contact opening / closing device is characterized in that the main contact spring is set near the free end and the arc contact spring is set near the base end with respect to the relative driving position in the direction. 2. A fixed contact plate having a fixed-side main contact,
And a movable contact plate supporting a base end of a main contact spring having a movable side main contact near the free end, and an arc contact spring having a movable side arc contact near the free end as a main contact spring. 2. The contact opening / closing device according to claim 1, wherein the fixed contact plates are provided side by side in parallel, and the fixed side arc contacts are provided on the movable contact plate.