JPH07101589B2 - Circuit breaker switching mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing mechanism for a circuit breaker such as a wiring breaker or an earth leakage breaker.

[Conventional technology]

FIG. 6 and FIG. 7 show a conventional structure. FIG. 6 is a side view of the switching mechanism of the circuit breaker in an ON state, and FIG. 7 is a sectional view taken along line VII-VII thereof.

In the figure, a fixed contactor 3 is fixed to a case 1 made of molded resin, and a movable contactor 4 which comes in contact with and separates from the fixed contactor 3 is rotatable via a pin 20 to an insulating holder 7 rotatably supported by the case 1. Held in. Reference numeral 2 is a mold resin cover attached to the case 1.

The opening / closing mechanism that drives the movable contactor 4 to open and close is formed on a pair of left and right side plates 5 that are upright on both sides of the movable contactor 4, as described below. Side plate 5
Is integrally raised from the base 6, and the base 6 is fastened and fixed to the case 1 by screws (not shown).

First, 11 is a latch that is rotatably supported inside the side plate 5 via a latch pin 10.
The latch pin 10 is rotatably supported by the side plate 5 at both ends.

Reference numeral 16 is a toggle link, which is composed of an upper link 13 and a lower link 14 which are connected to each other by a joint pin 15, the upper link 13 is connected to the latch 11 by a pin 18, and the lower link 14 is connected to the movable contact 4 by a pin 17. Has been done.

As can be seen from FIG. 7, both the upper link 13 and the lower link 14 are bifurcated with a pair of left and right arms, the upper link 13 sandwiches the latch 11, and the lower link 14 overlaps the movable contact 4 with the latch 11. Sandwiched.

Reference numeral 9 is a gate-shaped opening / closing lever that extends over the outside of the side plate 5, and is a cylindrical protrusion 21 that projects to the side surface of the side plate 5.
The front end is fitted to and is supported so as to be swingable in the front-rear direction (left and right in FIG. 6). The operation handle 8 is attached to the head portion 9a of the opening / closing lever 9 by fitting.

Reference numeral 19 denotes a pair of left and right opening / closing springs located on both sides of the toggle link 16, the upper end of which is hooked on the head of the opening / closing lever 9 and the lower end of which is hooked on the joint pin 15. In the ON state shown in the drawing, the opening / closing spring 19 is stretched and stores energy, and the toggle link 16 receiving the force stands up and presses the movable contact 4 against the fixed contact 3.

In this state, the latch 11 also opens and closes via the toggle link 16.
Although it is about to rotate counterclockwise in FIG. 6 with the latch pin 10 as a fulcrum under the force of 19, the tip end is locked by the receiving member 12 of the tripping mechanism to prevent the rotation.

From the state shown in the figure, force is applied to the operation handle 8 to open / close the lever 9.
When the projection 21 is tilted to the opposite side with respect to the fulcrum, at the moment when the line of action of the force of the opening / closing spring 19 acting on the joint pin 15 passes through the pin 18 from left to right in FIG.
The effect of is reversed.

As a result, the toggle link 16 in the upright state collapses and becomes an inverted V shape, and accordingly, the movable contactor 4 rotates integrally with the insulating holder 7 and separates to the position shown by the chain line in FIG. Yes (OFF operation). When the open / close lever 9 is tilted to the opposite side from that state, the action of the open / close spring 19 on the toggle link 16 is reversed in the opposite direction, and the movable contactor 4 is closed again in the illustrated state (ON operation).

When an overcurrent flows in the ON state of FIG. 6 and a trip device (not shown) is activated, the latch 11 is released from the latch 12 and jumps counterclockwise in FIG. 6 around the latch pin 10 as a fulcrum. . As a result, the action of the opening / closing spring 19 is reversed as in the OFF operation, and the movable contactor 4 is separated (trip operation).

[Problems to be Solved by the Invention]

However, such a conventional configuration has the following problems.

First, conventionally, the lower link 14 of the toggle link 16 is connected to the movable contactor 4, and the entire opening / closing mechanism serves as a charging section. Therefore, in order to ensure insulation between the left and right adjacent electrodes, the structure of the case 1 has to be complicated by covering the opening / closing mechanism with an insulating partition.

The latch 11 is fixed to the central portion of the latch pin 10 extending over the left and right side plates 5. Therefore, the movable contact 4 which has been separated hits the latch pin 10 and it is difficult to secure a sufficient separation distance L (FIG. 6). Further, even if the alarm switch for detecting the trip operation is operated by the latch 11, the alarm switch interferes with the operation handle 8 and the opening / closing lever 9, so that the installation thereof is difficult.

Therefore, an object of the present invention is to provide an opening / closing mechanism for a circuit breaker which is intended to insulate the movable contactor.

Another object of the present invention is to provide an opening / closing mechanism for a circuit breaker that does not interfere with the opening / closing operation of the movable contactor and the placement of the alarm switch.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a pair of left and right side plates fixed to a case, and rotatably supported by the side plates via latch pins, and is normally rotated by a money received by a tripping mechanism. A latch, the upper link and the lower link are connected to each other by a joint pin, the upper link is a toggle link connected to the latch, and an opening / closing lever swingably supported by the side plate, An open / close spring is provided between the open / close lever and the joint pin, and by inverting the action of the open / close spring with respect to the toggle link, the circuit breaks to open / close the movable contactor via the toggle link. In the opening and closing mechanism of the container, the movable contact is rotatably held by an insulating holder rotatably supported by the case, and the lower link of the toggle link is attached to this insulating holder. With coupling shall be cantilevered support the latch on the outside of the side plate.

[Action]

By connecting the lower link of the toggle link to the insulating holder holding the movable contact instead of directly connecting it to the movable contact, the movable contact and the toggle link are insulated via the insulating holder, and the charging part The opening / closing mechanism is not reached.

Then, by supporting the latch on the outside of the side plate, the latch pin is prevented from crossing between the left and right side plates, and does not interfere with the movable contact.
Further, as a result, the position of the latch pin is shifted laterally from the operation handle and the opening / closing lever, so that the alarm switch for latch operation can be easily installed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 shows the switching mechanism of the circuit breaker.
A side view of the ON state, FIG. 2 is a sectional view taken along the line II-II,
3 is a side view of the opening / closing mechanism portion of FIG. 1 in an OFF state, FIG. 4 is a front view of a main part of the insulating holder in FIG. 1, and FIG. 5 is a side view of FIG. The same reference numerals are used for the parts corresponding to the conventional example, and the description of the parts having the same configuration as the conventional example will be omitted.

First, in FIG. 4 and FIG. 5, the movable contact holding portion of the insulating holder 7 made of molding resin is a pair of left and right side walls.
The front wall 7b has a bifurcated shape in which 7a is connected to each other, and the left and right phase portions (not shown) on both sides thereof are integrally connected by an opening / closing shaft 7c. The side wall 7a is provided with a hole 22 for supporting the pin 20 holding the movable contactor 4.

Further, bifurcated lever arms 7d are formed integrally with the opening / closing shaft 7c on both sides of the movable contact holder, and pins 23 for connecting the lower link 14 and the insulating holder 7 are supported on the lever arms 7d. A hole 24 is drilled.

Under the above-mentioned configuration of the insulating holder 7, the movable contactor 4 has the side wall 7a.
It is rotatably held by the insulating holder 7 by the pin 20 between them. Although not shown, the insulating holder 7 and the movable contactor 4
A contact spring composed of a torsion spring is mounted between the movable contact 4 and the movable contact 4 by the spring force of the pin 20 as a fulcrum.
It is urged counterclockwise in the figure, and in the OFF state shown in the figure, the position is regulated by abutting on the front wall 7b.

As shown in FIG. 2, the insulating holder 7 holding the movable contactor 4 is rotatably supported by the case 1 with the opening / closing shaft 7c supported by the groove of the phase interval wall 1a of the case 1.

Here, in FIGS. 1 to 3, two plate-like latches 11 are provided in a pair of left and right, and these are supported by a latch pin 10 on the outside of the side plate 5 so as to be cantilevered. There is. At the time of assembling, the latch pin 10 having a collar portion at one end is attached to the side plate 5 and the latch.
It is loosely inserted in 11, and then a brim is formed at the other end by caulking.

Also, two sets of toggle links 16 are provided in pairs corresponding to the latch 11 so that the left and right sides are paired, and the upper and lower links 13 and 14 are both formed in a plate shape. The upper link 13 is connected to the latch 11 by a pin 18, and the outer lower link 14 is connected to a lever arm 7d of the insulating holder 7 by a pin 23.

The upper link 13 and the lower link 14 are connected to each other by a common joint pin 15 that passes through the side plate 5 and extends to the left and right. A window hole 25 is provided in a portion of the side plate 5 through which the joint pin 15 penetrates so as to escape the movement trajectory of the joint pin 15 associated with the opening / closing operation.

On the other hand, the opening / closing lever 9 is housed inside the side plate 5 and has a tip end fitted to a protrusion 21 protruding from the side plate 5 and is swingably supported. And its head 9a
A pair of open / close springs 19 are stretched between the joint pin 15 and the joint pin 15.

Reference numeral 26 denotes an alarm switch for detecting a trip operation, which is fixed to the cover 2 in conformity with the latch 11 on one side, and its actuator 26a faces the tip of the latch 11 locked by the receiving metal 12.

With the above configuration, in the ON state of FIG.
The toggle link 16 is erected by the spring force of the insulating holder 7
The movable contactor 4 is in contact with the fixed contactor 3 by being pushed down with the open / close shaft 7c as a fulcrum. In this state, the movable contactor 4 is slightly pushed up against the contact spring with the pin 20 as a fulcrum by the reaction force from the fixed contactor 3, and a required contact pressure is applied between the movable contactor 4 and the fixed contactor 3. ing.

When the open / close lever 9 is tilted to the left or right via the operation handle 8 from this state, the action of the open / close spring 19 on the toggle link 16 is reversed as in the conventional example, and the toggle link 16 collapses, as shown in FIG. The movable contactor 4 is separated.

When an overload current flows through the circuit breaker and the latch 11 is released from the latch 12, the latch 11 jumps up as shown by the chain line in FIG. 1, and the action of the opening / closing spring 19 is also reversed. The movable contactor 4 is separated to the position indicated by the chain line.

At this time, in the alarm switch 26, the actuator 26a is operated by the latch 11 that has jumped up, the contacts are switched, and the trip signal is sent to the outside.

Here, according to the illustrated configuration, the lower link of the toggle link 16
Since 14 is connected to the insulating holder 7 by the pin 23 and is insulated from the movable contactor 4 held by the insulating holder 7 by the pin 20 via the insulating holder 7, the opening / closing mechanism does not serve as a charging section. Therefore, it is not necessary to consider the insulation between the open / close mechanism and the adjacent phase.

In addition, since the movable contactor 4 which rotates about the pin 20 as a fulcrum receives the force only from the fixed contactor 3, the wiping action at the time of closing becomes smooth and the contact pressure between the contacts becomes stable.

Further, in the illustrated configuration, since the latch 11 is cantilevered on the side plate 5 by the latch pin 10, the latch pin 10 is divided into right and left and does not interfere with the movable contactor 4, and the separation distance of the movable contactor 4 is reduced. L ₁ is the conventional L (6th
Can be taken larger than the figure).

Further, since the latch 11 is located beside the operation handle 8 and the opening / closing lever 9, the alarm switch 26 operated by the latch 11 is provided.
Can be installed without being hindered by these.

〔The invention's effect〕

According to the present invention, by connecting the lower link of the toggle link to the insulating holder holding the movable contactor, the opening / closing mechanism does not serve as a charging section, and the insulating structure of the case is simplified.

Also, by supporting the latch on the outside of the side plate by a cantilever, the separation distance of the movable contactor can be increased, so that the breaking performance is improved and the alarm switch operated by the latch can be easily installed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an ON / OFF state of an opening / closing mechanism portion of a circuit breaker showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a side view of the opening / closing mechanism portion of FIG. 1 in the OFF state, FIG. 4 is a front view of the main part of the insulating holder in FIG. 1, FIG. 5 is a side view of FIG. 4, and FIG. FIG. 7 is a side view showing an ON state of an opening / closing mechanism portion of the circuit breaker, FIG. 7 is a sectional view taken along line VII-VII of FIG. 1: case, 2: cover, 3: fixed contact, 4: movable contact, 5:
Side plate, 7: Insulation holder, 9: Open / close lever, 10: Latch pin, 11: Latch, 12: Receiving, 13: Upper link, 14: Lower link, 15: Joint pin, 16: Toggle link, 19: Open / close spring .

Claims (1)

[Claims] 1. A pair of left and right side plates fixed to a case, and a latch rotatably supported by the side plates via a latch pin and normally prevented from rotating by receiving a trip mechanism. An upper link and a lower link are connected to each other by a joint pin, the upper link is a toggle link connected to the latch, an opening / closing lever swingably supported by the side plate, the opening / closing lever and the joint pin. An opening / closing spring that is bridged between the two, and by inverting the action of the opening / closing spring on the toggle link, the opening / closing mechanism of the circuit breaker for opening / closing driving the movable contactor via the toggle link is The contact is rotatably held by an insulating holder that is rotatably supported by the case, the lower link of the toggle link is connected to this insulating holder, and the latch is connected. An open / close mechanism for a circuit breaker, which is supported by a cantilever on the outside of a side plate.