JPH06236729A - Bipolar circuit breaker - Google Patents

Abstract

PURPOSE:To easily assemble a cross bar after assembling a movable contact plate to a base without damaging the contact fusion preventing effect of an engagement claw by differing the bosom depths of two engagement claws. CONSTITUTION:A cross bar 1 having a main body part 101, a cover inner surface contact part 102, and engagement claws 103, 104 having cutouts 105, 106 differed in depth, and the cutout 105 on the inner surface contact part 102 side is deeper than the other cutout 106. After fixed contacts 4, 4 and movable contact plates 2, 2 are assembled to a base 6, the cross bar 1 is inserted to guide grooves 601, 601, and the claw 103 on the deeper cutout side is obliquely engaged with the one-side plate 2 to the full depth. Thereafter, other constituting parts are assembled, and a cover is put on the base 6, whereby the part 102 makes contact with the inner surface of the cover to arrest the movement of the bar 1 to the left, so that the engagement between the claw 104 and the plate 2 is never released. Thus, fusion generation is suppressed, and the cross bar 1 can be easily assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving workability of a two-pole wiring breaker assembly, which is generally called a safety breaker, and particularly relates to a card or a crossbar for connecting the opening / closing urging force of a mechanism with a contact plate. This relates to the structure of a member called (hereinafter referred to as a crossbar).

[0002]

2. Description of the Related Art An example of the structure of a conventional circuit breaker of this type is shown in FIG. In FIG. 4, 10 and 21 are terminal plates, 11,
12 is a contact point, 13 is a movable contact plate, 14 is an engaging piece, 15 is a bimetal, 16 is a holding plate, 17 is a link, 18 is a handle, 19 is a crossbar, and 20 is a lead wire. The movable contact plate 13 having elasticity for constantly biasing the movable contact 12 is used as an engaging piece 14 and a holding plate 1.
A mechanism composed of 6, a link 17, a handle 18, and a frame (not shown) presses in the contact closing direction against the opening biasing force to close or contact the contact or release the pressing force to move the movable contact plate by itself. Alternatively, the contact is opened by the contact opening force by another force.

Reference numeral 19 denotes a cross bar, which links the above-mentioned mechanism and the movable contact plate, and particularly, the opened and closed states of a single mechanism are simultaneously and electrically connected to two independent movable contact plates. It is intended to be insulated and transmitted, and is attached to a sliding guide groove formed in a frame including a base that slides only in the vertical direction of FIG. 4 and prevents movement in other directions. .

More specifically, when the mechanism is working in the direction to close and close the contacts, the crossbar abutting portion 1602 of the holding plate 16 holds the central upper portion of the crossbar 19,
The crossbar 19 moves in a direction that uniformly presses both of the two movable contact plates 13, 13 to close the contacts.

On the other hand, when the mechanism is operating in the direction of opening the contacts, the pressure constraint on the center upper portion of the crossbar 19 of the crossbar abutting portion 1602 of the holding plate 16 is released, and the movable contact is caused by its own force or other force. By the separating force of the plates 13 and 13, both the crossbar 19 and the crossbar contact portion 1602 are lifted to separate the contacts.

There are two cases in which the above-mentioned contact opens. One is the operation from on to off by the manual handle, and the other is trip off due to an abnormal current from the time of normal on. In case of trip off,
The current to be interrupted is a considerably large current such as an overcurrent or a short-circuit current.
The contacts of either of the two poles may be welded at the beginning of opening. Therefore, as shown in FIG. 5, the crossbar 19 is provided between the two movable contact plates 13, 13 on the back side 1 of the crossbar main portion 1902 mounting surface 1301 of the movable contact plates.
Provided with engaging claws 1901 and 1901 that wrap around 302 and extend outward, when one contact is likely to be welded and difficult to separate, the separating force of the other contact causes a crossbar having an engaging claw. It also works on the contact side, which tends to be welded, to prevent welding.

However, the construction of the crossbar and the movable contact plate as shown in FIGS. 4 and 5 has the following problems when automating the assembly. That is, the outer and outer dimensions of the claws 1901 and 1901 are larger than the inner and outer dimensions of the movable contact plates 13 and 13, and the outer and outer dimensions of the base of one of the claws and the tip of the other claw are larger. The movable contact plates 13 and 13 are assembled to the body, and then the crossbar 1
The order of assembling 9 to the movable contact plate cannot be taken, and the movable contact plates 13 and 13 must be engaged with the claws 1901 and 1901 of the crossbar 19 in advance, and then assembled to the body. It was very inconvenient, and this part made it difficult to improve the workability of assembling this type of circuit breaker.

[0008]

The object of the present invention is to prevent the contact welding of the claws 1901 and 1901 from being impaired and to assemble the claws of the crossbar 19 after the movable contact plates 13 and 13 are assembled to the body. It is an object of the present invention to provide a two-pole wiring breaker which can be assembled by engaging with a movable contact plate and which can be automatically assembled.

[0009]

In order to achieve the above object, the invention of the present case
When the crossbars are inserted between the movable contact plates by making a difference in the depth of the two engaging claws, first, the engaging claws on the deep side of the spaces are fully engaged with one movable contact plate,
Next, when the engaging claw on the shallow side of the corner is engaged with the remaining movable contact plate and the cover of the body consisting of the base and the cover is covered in that state, the cover inner wall abutting part provided on the crossbar is It is regulated by the inner wall of the cover to prevent it from moving to the deep claw side of the foot and disengaging the shallow side of the foot, so that the engaging claw does not come off while engaging with the two movable contact plates. It is a thing.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded view of an embodiment of the present invention. Reference numeral 6 is a base that constitutes a body together with the cover 7, and has fixed contact assembly parts 602 and 602 and movable contact plate assembly parts 603 and 603.
01,601. Reference numerals 4 and 4 are fixed contacts, and reference numerals 2 and 2 are movable contact plates. The base portion 203 is fixed to the assembly portions 603 and 603 of the base 6 by screws 8 and 8 in parallel with each other. Reference numerals 3 and 3 denote movable contact plates fixed to the fixed contact points 4 and 4 at the tips of the movable contact plates 2 and 2, respectively. In addition, 2 and 2 are made of elastic spring plates as a base material, and are fixed to the base so that the contacts 3, 3 and 4, 4 are stable by being separated from each other by their own force or other force.

Reference numeral 1 denotes a crossbar according to the present invention, which has a main body portion 101, a cover inner surface abutting portion 102, and engaging claws 103 and 104 having pockets 105 and 106 having different depths. The side pocket 105 is deeper than the other pocket 106. Engaging claw 103,
The tip end of 104 is arranged in a substantially symmetrical position with respect to the main body 101, and the dimension W ₂ between the tip of the engaging claw 104 on the deep side of the foot 105 on the deep side of the foot and the engaging claw 104 on the side of the shallow foot 106 is attached to the base. It is made a little smaller than the inner space dimension W ₁ of the two movable contact plates 2 and 2 in the opened state.

A pressing plate 5 has a hole 502 for connecting to the mechanism, a crossbar pressing portion 501, and an engaging portion 503. Normally, 503 is engaged with an engaging piece (not shown) and its position is restricted by the mechanism. When the hole 502 is operated, the pressing portion 501 presses the crossbar 1 and urges the movable contact plates 2 and 2 so that the contacts 3, 3 and 4, 4 are closed.

In the above parts, after the fixed contacts 4 and 4 and the movable contact plates 2 and 2 are assembled to the base 6, the crossbar 1 is inserted into the guide grooves 601 and 601 and, as shown in FIG. The claw 103 on the deep side of the foot is obliquely engaged with the movable contact plate 2 on one side to the full extent of the foot.
At that time, since the inner and inner dimensions of the movable contact plates 2 and 2 are W ₁ , the dimension W ₂ between the tips of the push bottom portion 105 and the engaging piece 104 on the deep side of the foot of the crossbar 1 is slightly smaller. It is possible to easily drop the engaging claws 104 from above the movable contact plate 2 in FIG. 2 to below.
Of course, during this time, the crossbar 1 has the base guide grooves 601 and 60.
It is supported by 1 in the front and back directions of FIG.

After that, other mechanical parts (not shown) are assembled, and the cover 7 is put on the base 6 as shown in FIG.
Of the cross bar 1 in FIG. 3 is prevented from moving to the left, and the engagement claw 104 on the shallow side of the corner and the movable contact plate on the right side of the figure cannot be disengaged.

[0015]

[Effect] In the assembled state of the above two-pole circuit breaker, the crossbar cover inner wall contact portion 102 is prevented from moving by the cover inner wall, and the engagement claws 103 and 104 and the movable contact plates 2 and 2 are engaged. If the contact on one side is welded at the time of short circuit or overcurrent interruption, the remaining movable contact plate is opened, so that the contact that is welded Can be separated and the occurrence of welding can be suppressed.

When assembling, in the two-pole circuit breaker having the structure shown in FIG. 5, it is necessary to previously engage the movable contact plates 13 and 13 with the engaging claws 1901 and 1901 of the crossbar 19 and assemble them to the base. However, in the present invention, since the movable contact plates 2 and 2 can be assembled to the base first and then the crossbar 1 can be easily assembled, it is very easy to assemble. convenient. It is obvious that the present invention can be used for circuit breakers other than those for protection of wiring as long as the structures are similar.

[Brief description of drawings]

FIG. 1 is an exploded view of a crossbar peripheral structure of a two-pole circuit breaker of the present invention.

[FIG. 2] Same as above, an explanatory diagram of assembly of a movable contact plate and a crossbar

FIG. 3 is a diagram showing the engagement of the movable contact plate and the crossbar in the assembled state.

FIG. 4 is a structural explanatory view of a circuit breaker for two-pole wiring.

FIG. 5 is a diagram showing engagement between a movable contact plate and a crossbar of a conventional circuit breaker for two-pole wiring.

[Explanation of symbols]

 1 Crossbar 101 ...... Main part 102 ...... Cover inner wall abutting part 103 ...... Engagement claw 104 on deep side of the foot ...... Engagement claw 105 on shallow side of the foot ...... Deep foot 106 ...... Shallow side No. 2 Movable contact plate 201 ...... Contact side opposite side 202 ...... Contact side face 3 Movable contact 4 Fixed contact

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[Procedure amendment]

[Submission date] January 12, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Oath

[Correction content]

[Claims]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takumi Kawabuchi, 3-34, 1-2, Oshu, Minami-ku, Hiroshima City Tempar Industrial Co., Ltd.

Claims (1)

[Claims] 1. A two-pole circuit breaker having a contact that opens and closes, a mechanism that opens and closes the contact, and a means that detects overcurrent, leakage, etc., and pulls out the mechanism to shift the contact from closed to open. A fixed contact, two movable contacts, and each of the two movable contacts fixed to the tip and arranged parallel to each other on the base 2
One movable contact plate, and the two movable contact plates are simultaneously fitted at right angles, and
The crossbar comprises a crossbar that slides in the frame guide groove in the contact opening / closing direction and follows the mechanism to open / close the two contacts, and a cover that is combined with a base to separate the two parts into the outside and the inside. Is a main body placed on the surface of the two movable contact plates opposite to the fixed contact side, and two extending from between the two movable contact plates to the fixed contact side surfaces of the two movable contact plates. It is composed of an engaging claw and a cover inner surface abutting part at one side end of the main body part, and makes a difference in the depth of the foot of the two engaging claws, and at the end of the claw on the shallow side of the foot depth and the deep side. The outer pitch between the bottom and the bottom of the claw of the claw is almost the same as or slightly smaller than the inner pitch between the two movable contact plates arranged on the base, and the cover inner surface abutting part is located on the deep side of the cover. Provided at the end of the main body, the parts are assembled With the bar applied, the position of the crossbar is regulated by the cover inner surface abutting part and the cover inner surface in the direction in which the engagement of the shallow contact point and the movable contact plate is almost full. Two-pole circuit breaker.