JPH0877858A - Support structure of movable contactor - Google Patents

Abstract

PURPOSE: To provide a support structure of a movable contactor by which the service life of a contact point can be lengthened by arranging an allowance on the outer periphery of a shaft so as to be capable of swinging a support shaft to rotatably support the movable contactor. CONSTITUTION: A support structure of this movable contactor 1 is provided with the movable contactor 1 having a movable contact point 2 to contact with and separate from a fixed contact point 7, a support member 3 having a support hole 31b in which a support shaft 32 is inserted to rotatably support the movable contactor 1 by being inserted in a through hole 1a bored in the movable contactor 1 and an energizing spring 4 to energize the movable contactor 1 so that contact pressure is applied when the movable contact point 2 comes into contact with the fixed contact point 7. An allowance 33 capable of swinging the support shaft 32 is arranged between an inside edge part 1d of the through hole 1a or the support hole 31b and an outer peripheral part 32a of the support shaft 32. When this allowance is constituted between the inside edge part 1d of the through hole 1a and the outer peripheral part 32a of the support shaft 32 by arranging a positioning means 34 to determine an inserting position of the support shaft 32 in the through hole 1a, insertion positioning of the support shaft 32 in the through hole 1a is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a movable contact provided on a breaker or the like.

[0002]

2. Description of the Related Art Conventionally, as a supporting structure for a movable contact of this type, there is a structure shown in FIGS. This one is inserted into a movable contact C provided with a movable contact B that is brought into contact with and separated from a fixed contact A, and a through hole C ₁ formed in the movable contact C to rotatably support the movable contact C. The support member D provided with the support hole D ₂ into which the support shaft D ₁ is inserted, and the movable contact C so that the movable contact A abuts the fixed contact B and a contact pressure is applied.
And a biasing spring E for biasing the.

[0003] More specifically, between the outer peripheral portion of the through hole C ₁ of the inner edge and the support shaft D ₁ is, there is a slight gap to the extent that the support shaft D ₁ can pivot, the support shaft D ₁ Are inserted and fixed in the support holes D ₂ .

[0004]

In the above-mentioned conventional support structure for a movable contact, the through hole C ₁ of the movable contact C is formed obliquely instead of parallel to the thickness direction of the movable contact C. When the support member D itself is obliquely arranged with respect to the fixed contact A, as shown in FIG. The contact area between A and B becomes smaller, which increases contact resistance and raises the temperature of both contacts A and B, which may shorten the contact life.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a support structure for a movable contact which can prolong the life of the contact.

[0006]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, a movable contact having a movable contact for contacting with and separating from a fixed contact and a penetrating hole provided in the movable contact are provided. A support member provided with a support hole into which a support shaft that rotatably supports the movable contactor is inserted through the hole, and a movable contactor so that the movable contact contacts the fixed contact and a contact pressure is applied. In a support structure for a movable contact, which includes an urging spring for urging, an allowance is provided between the inner edge of the through hole or the support hole and the outer periphery of the support shaft so that the support shaft can swing. It has a different configuration.

According to a second aspect of the present invention, in the first aspect, the margin is provided between an inner edge portion of the through hole and an outer peripheral portion of the support shaft. Positioning means for determining the insertion position of the support shaft in the hole is provided.

According to a third aspect of the present invention, in the first aspect, the margin is provided between an inner edge portion of the through hole and an outer peripheral portion of the support shaft. At least one of the inner edge portion of the hole and the outer peripheral portion of the support shaft is provided with a contact portion that contacts the other.

According to a fourth aspect of the present invention, in the third aspect, the contact portion is formed into a substantially spherical shape.

[0010]

According to the first aspect of the present invention, the through hole of the movable contactor is formed obliquely instead of parallel to the thickness direction of the movable contactor, and the support member itself is arranged obliquely with respect to the fixed contact. Even if both contacts are unevenly contacted due to installation,
When the support shaft swings by the spring bias of the biasing spring within the margin between the through hole or the inner edge of the support hole and the outer periphery of the support shaft, the movable contact contacts the portion contacted due to the bias. Rotate with the fulcrum as a fulcrum and the whole contacts the fixed contact.

According to the second aspect of the present invention, the insertion position of the support shaft in the through hole can be determined by the positioning means only by inserting the support shaft into the through hole, which facilitates the positioning work.

According to the third aspect, the support shaft is
The abutting portion provided on at least one of the inner edge portion of the through hole or the outer peripheral portion of the support shaft has a frictional resistance, so that the abutting portion does not fall off, and the work of adjusting the insertion position in the through hole is facilitated.

According to the fourth aspect of the present invention, since the abutting portion formed in a substantially spherical shape is less likely to damage the abutted portion, abrasion powder from the flaw may enter between both contacts. The contact reliability of both contacts becomes high.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The support structure of the movable contactor is composed of the movable contactor 1, the movable contact 2, the support member 3, and the biasing spring 4, and is disposed inside the breaker to support the movable contactor 1.

The movable contact 1 is made of a conductive plate material such as a copper alloy, and has a movable contact 2 for contacting and separating with a fixed contact 7 fixed to one end thereof, and a first through hole 1a formed substantially in the center thereof. The second through hole 1b is formed near the other end. This second
The insertion shaft 1c is inserted and fixed in the through hole 1b.

The support member 3 includes a support member main body 31 and a support shaft.
It is 32. The support member main body 31 is made of a resin material such as plastic and has a square hole 31a, and both end portions of the support shaft 32 are fixed to the inner edge portions of the square hole 31a facing each other after the insertion. A supporting hole 31b for supporting is formed. The support shaft 32 is the first through hole of the movable contact 1.
The movable contact 1 is rotatably supported by being inserted into the 1a, and in this inserted state, there is a gap between the inner edge portion 1d of the first through hole 1a and the outer peripheral portion 32a of the support shaft 32. margin
33 are provided. Specifically, when the plate thickness of the movable contactor 1 is 2.6 mm, the inner diameter of the first through hole 1a is 2.9.
Since the support shaft 32 has an outer diameter of 2.6 mm, the allowance 33 is 0.3 mm. When the plate thickness of the movable contact 1 is 5.0 mm, the inner diameter of the first through hole 1a is 3.3 mm and the outer diameter of the support shaft 32 is 3.0 mm. It becomes 0.3 mm. Both ends of the insertion shaft 1c are in contact with the inner edges of the square hole 31a that face each other, and the abnormal current detection unit 10 detects an abnormal current and the opening / closing mechanism unit 9 operates to make contact. The position is displaced.

The urging spring 4 is arranged between the insertion shaft 1c located at the other end of the movable contact 1 and one end opening edge of the square hole 31a of the support member 3, and the movable contact 2 is fixed. The movable contactor (1) is urged so as to come into contact with and be applied with contact pressure.

Next, a state in which the support structure for the movable contact described above is arranged on the breaker 20 will be described. This breaker 20
In addition to the movable contact support structure, the case 5, fixed contact 6, fixed contact 7, operating handle 8, opening / closing mechanism 9, abnormal current detector 10, load terminal board 11, flexible wire 12 , Terminal screw
Equipped with 13.

The case 5 is formed in a box shape with an insulating material such as phenol resin. This case 5
The upper wall surface is provided with an operation handle opening 5a, and the left and right side walls are provided with a fixed contactor mounting portion 5b and a load terminal plate mounting portion 5c. Below the case 5, there is an accommodation space for accommodating the support structure for the movable contact.

The fixed contact 6 has a length extending from the inside of the case 5 to the outside when mounted on the fixed contact mounting portion 5b, and is fixed to one end located on the inner side of the case 5. Since the contact 7 is fixed and the other end on the external side also serves as a terminal plate, the terminal screw 13 is screwed.

The operating handle 8 is attached to the opening / closing mechanism 9 so as to be rotatable, and the operating portion 8a located above the operating handle 8 projects from the operating handle opening 5a.

The opening / closing mechanism section 9 is connected to the support member 3, and opens and closes the fixed contact 7 and the movable contact 2 by operating the operation handle 8, and at the same time, detects an abnormal current detection section 10.
When the abnormal current is detected by the
It operates so as to forcibly open the contacts.

The abnormal current detector 10 is connected between the load terminal board 11 and the flexible electric wire 12, and extends from the fixed contact 6 to the load terminal board.
When an abnormal current flows in the circuit leading to 11, the abnormal current is detected.

The load terminal plate 11 is made of a conductive material such as copper alloy, is mounted on the load terminal plate mounting portion 5c, and the terminal screw 13 is screwed therein.

The flexible electric wire 12 is a braided wire that electrically connects the abnormal current detector 10 and the movable contact 1.

Next, when the first through hole 1a of the movable contactor 1 is not parallel to the thickness direction of the movable contactor 1 and is obliquely formed, the contact points of both contacts 2, 7 are contacted. About contact state,
A description will be given based on FIGS. 3A and 3B.

When the first through hole 1a of the movable contactor 1 is formed obliquely, initially, as shown in FIG.
Although the contact points 2 and 7 are biasedly abutted and the contact area between the contact points 2 and 7 is small, the support shaft 32 inserted into the first through hole 1a has an inner edge of the first through hole 1a. In the margin 33 between the portion 1d and the outer peripheral portion 32a of the support shaft 32, the movable spring 2 is rotated by the bias of the biasing spring 4 as a fulcrum and the movable contact 2 is rotated as a fulcrum. As shown in (b), the entire movable contact 2 is swung so as to contact the fixed contact 7.

In the structure for supporting such a movable contact,
As described above, the first through hole 1a of the movable contactor 1 is not formed in parallel with the thickness direction of the movable contactor 1 but is formed obliquely,
Even if both contacts 2 and 7 contact unevenly, the support shaft 32 moves to the first position.
In the margin 33 between the inner edge portion 1d of the through hole 1a and the outer peripheral portion 32a of the support shaft 32, the movable contact 2 is eccentrically abutted by swinging by the spring bias of the biasing spring 4. Since the whole part contacts the fixed contact 7 by rotating with the contact point as a fulcrum, the contact area between both contacts 2 and 7 becomes large and the contact resistance decreases, and the temperature between both contacts 2 and 7 does not rise. . Specifically, as described above, when the margin 33 is 0.3 mm, the temperature is 5 ° C. lower than that of the conventional example. Therefore, the contact life can be extended.

Next, a second embodiment of the present invention will be described below with reference to FIG. The members having substantially the same functions as those in the first embodiment are designated by the same reference numerals, and only different points from the first embodiment will be described.

In the first embodiment, the operator performs the first positioning operation for determining the insertion position of the support shaft 32 in the first through hole 1a.
Although the supporting shaft 32 is appropriately inserted into the through hole 1a, the positioning means 34 is used in this embodiment.

More specifically, the first through hole 1a is provided with a stepped portion 1e whose inner diameter changes at the substantially central portion so that the opening at one end is larger than the opening at the other end. , First
The through hole 1a is provided with a disc 32b which is smaller than the inner diameter of the opening at one end and larger than the inner diameter of the opening at the other end and constitutes the positioning means 34 together with the step portion 1e. Therefore, when the support shaft 32 is inserted from the one end opening portion of the first through hole 1a, the disc 32b of the support shaft 32 contacts the step portion 1e of the first through hole 1a, and further insertion is restricted. The insertion position is positioned.

In the structure for supporting such a movable contact,
In addition to the effects of the first embodiment, the support shaft in the first through hole 1a
The insertion position of 32 can be determined by the positioning means 34 only by inserting the support shaft 31 into the first through hole 1a, which facilitates the positioning work.

Next, a third embodiment of the present invention will be described below with reference to FIG. The members having substantially the same functions as those in the first embodiment are designated by the same reference numerals, and only different points from the first embodiment will be described.

In the first embodiment, the inner edge of the first through hole 1a
While 1d and the outer peripheral portion 32a of the support shaft 32 are parallel to each other, in the present embodiment, the contact portion 1f having a triangular cross section that abuts on the outer peripheral portion 32a of the support shaft 32 is provided at the inner edge portion of the first through hole 1a. It has a structure provided in 1d.

Next, a fourth embodiment of the present invention will be described below with reference to FIG. The members having substantially the same functions as those in the third embodiment are designated by the same reference numerals, and only different points from the third embodiment will be described.

In the third embodiment, the contact portion 1f is provided with the first through hole.
In contrast to being provided on the inner edge portion 1d of 1a, in the present embodiment, it is provided on the outer peripheral portion 32a of the support shaft 32.

In addition to the effects of the first embodiment, the support shaft 32 has the inner edge portion 1d of the first through hole 1a in any of the movable contact support structures of the third and fourth embodiments. Or support shaft
The contact portion 1f provided on the outer peripheral portion 32a of 32 has a frictional resistance so that the contact portion 1f does not fall off, and the first through hole
Adjustment work of the insertion position in 1a becomes easy.

Next, a fifth embodiment of the present invention will be described below with reference to FIG. The members having substantially the same functions as those in the fourth embodiment are designated by the same reference numerals, and only different points from the fourth embodiment will be described.

In the fourth embodiment, the contact portion 1f has a pointed tip, whereas in this embodiment, the contact portion 1f has a substantially spherical shape.

In the support structure for such a movable contact,
In addition to the effect of the fourth embodiment, the contact portion formed in a substantially spherical shape
1f makes it difficult to scratch the inner edge 1d of the first through hole 1a which is the contacted portion, so that abrasion powder from the scratch does not enter between the contact points 2 and 7, and The contact reliability of 7 is high.

In each of the first to fifth embodiments, the allowance 33 for swinging the support shaft 32 is provided between the inner edge portion 1d of the first through hole 1a and the outer peripheral portion 32a of the support shaft 32. However, when the allowance 33 for allowing the support shaft 32 to swing is provided between the inner edge of the support hole 31b and the outer peripheral portion 32a of the support shaft 32, the support member 3 itself does not contact the fixed contact 7. When the contact points 2 and 7 are obliquely arranged and abutted against each other, the support shaft 32 is biased in the margin 33 between the inner edge portion of the support hole 31b and the outer peripheral portion 32a of the support shaft 32. Four
When the movable contact 2 is swung by the biasing force of the
2 The whole contacts the fixed contact 7 and the contact area between both contacts 2 and 7 increases, the contact resistance decreases and the temperature between both contacts 2 and 7 does not rise, and the contact life can be extended. .

In all of the third to fifth embodiments, the contact portion 1f is provided on either the inner edge portion 1d of the first through hole 1a or the outer peripheral portion 32a of the support shaft 32. However, it may be provided on both sides.

Further, although the first to fifth embodiments are all used for the breaker 20, the same effect can be obtained not only for the breaker 20 but also for other contact switching devices. be able to.

[0044]

According to the first aspect of the present invention, the through hole of the movable contactor is formed obliquely instead of parallel to the thickness direction of the movable contactor, and the support member itself is arranged obliquely with respect to the fixed contact. Even if both contacts are unevenly contacted due to installation,
When the support shaft swings by the spring bias of the biasing spring within the margin between the through hole or the inner edge of the support hole and the outer periphery of the support shaft, the movable contact contacts the portion contacted due to the bias. Since it rotates around the fulcrum as a fulcrum and contacts the fixed contact as a whole, the contact area between both contacts increases and the contact resistance decreases.
Since the temperature of both contacts does not rise, the contact life can be extended.

According to the second aspect, in addition to the effect of the first aspect, the insertion position of the support shaft in the through hole is determined by the positioning means only by inserting the support shaft into the through hole. Therefore, the positioning work becomes easy.

According to a third aspect of the present invention, in addition to the effects of the first aspect, the support shaft has a frictional resistance at the abutting portion provided on at least one of the inner edge portion of the through hole and the outer peripheral portion of the support shaft. Since it is provided, it does not fall off, and the work of adjusting the insertion position in the through hole is facilitated.

In addition to the effects of the third aspect of the invention, the abutting portion formed in a substantially spherical shape makes it difficult to scratch the abutted portion. Will not enter between both contacts, and the contact reliability of both contacts will be high.

[Brief description of drawings]

FIG. 1 is a plan view around a supporting member of a breaker using a first embodiment of the present invention.

FIG. 2 is a plan view showing a supporting state of the above movable contactor.

FIG. 3 is a side view showing a contact state of both contacts when a through hole of the movable contact element is formed obliquely.

FIG. 4 is a sectional view of a breaker using the same as above.

FIG. 5 is a plan view showing a supported state of the movable contact according to the second embodiment of the same.

FIG. 6 is a plan view showing a supported state of a movable contact according to the third embodiment of the same.

FIG. 7 is a plan view showing a supported state of a movable contact according to a fourth embodiment of the same.

FIG. 8 is a plan view showing a supported state of the movable contact according to the fifth embodiment of the same.

FIG. 9 is a side view showing a contact state of both contacts when a through hole of a movable contactor of a conventional example is formed obliquely.

FIG. 10 is a side view showing a contact state of both contacts when a supporting member of a conventional example is obliquely arranged.

[Explanation of symbols]

 1 movable contact 1a first through hole 1d inner edge 1f abutment 2 movable contact 3 support member 31b support hole 32 support shaft 32a outer periphery 33 allowance 34 positioning means 4 biasing spring 7 fixed contact

Claims (4)

[Claims] 1. A movable contact provided with a movable contact that comes in contact with and separated from a fixed contact, and a support shaft that is inserted into a through hole formed in the movable contact to rotatably support the movable contact. A support structure for a movable contact, comprising: a support member provided with a support hole; and an urging spring that urges the movable contact so that the movable contact comes into contact with the fixed contact to apply contact pressure thereto. A support structure for a movable contact, characterized in that an allowance for the support shaft to swing is provided between the inner edge of the hole or the support hole and the outer peripheral portion of the support shaft. 2. The margin is provided between an inner edge portion of the through hole and an outer peripheral portion of the support shaft, and a positioning means is provided for determining an insertion position of the support shaft in the through hole. The support structure for a movable contact according to claim 1, wherein: 3. The margin is provided between an inner edge portion of the through hole and an outer peripheral portion of the support shaft, and at least one of the inner edge portion of the through hole and the outer peripheral portion of the support shaft is the other. 2. An abutting portion that abuts against is provided.
The support structure for the movable contact described. 4. The support structure for a movable contactor according to claim 3, wherein the contact portion is formed in a substantially spherical shape.