JPH0520998A - Circuit breaker - Google Patents

Abstract

PURPOSE:To facilitate the assembly work of a circuit breaker so as to facilitate the automatic assembly thereof as compared with the case where a draw spring is used, so that the mass-producibility of the circuit breaker may be raised to reduce the manufacturing cost thereof by compressively interposing a reversing spring between a cradle and a movable contact-maker. CONSTITUTION:A compressed reversing-spring 46 is suspended between spring- bearing portions 44 and 45 provided to both of a movable contact-maker 38 and a cradle 31. When a movable contact-point 41 and a stationary contact-point 42 are closed and also when the locking portion 37 of the cradle 31 is locked in the locking bearing portion 51 of an abnormal current detecting means 14, the spring 46 applies contact pressure between both contact-points. When the locking portion 37 is released from the bearing portion 51 of the means 14, the spring makes its reverse movement so that the contact-maker 38 and the cradle 31 may be rotated in a direction wherein the contact-point 41 is detached from the contact point 42. The use of a compressed spring for the reversing spring 46 can facilitate the assembly work of arranging component members and locking the members with one another or the like so as to make even the automatic assembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly to a circuit breaker which is provided with an abnormal current detecting means in addition to a manual opening / closing means and which can appropriately open / close a switching contact means.

[0002]

2. Description of the Related Art As this type of circuit breaker, FSMali
U.S. Pat. No. 4,056,798 by ck. This U.S. Patent shows a circuit breaker including a manual opening / closing means, a trip means as an abnormal current detecting means, and an opening / closing contact means. In this case, the manual opening / closing means is connected to a handle and a rotatable relative to the handle. A cradle is included, the cradle is linked to the movable contactor of the switching contact means via a tension spring, and one end of the cradle is releasably locked to the trip means including the bimetal when an abnormal current is detected.

If the handle is rotated while resisting the spring force of the tension spring, the movable contact can be swung to open / close the opening / closing contact means. On the other hand, when an abnormal current flows in the circuit breaker, the bimetal of the trip means bends and one end of the cradle is released from the trip means, and the spring force of the tension spring displaces the movable contact in the contact opening direction. And the switching contact means are forced into the open state.

[0004]

However, since the circuit breaker according to the above-mentioned US Patent uses a tension spring, it must be done while applying a tension force between the cradle and the movable contactor when assembling the components. Assembling work such as disposing the constituent members or locking the members to each other is complicated, and particularly in the automatic assembling work, it is difficult to automatically feed the parts due to the entanglement of the hooks of the tension springs.

In addition, since the direction in which the spring force of the tension spring is applied during the trip operation at the time of detecting the abnormal current is substantially vertical, if the contact opening force acting on the movable contactor during the trip operation is increased, Since it is necessary to increase the tension spring, there is a problem that the greater the tension spring force, the lower the assemblability. Therefore, the object of the present invention is to
An object of the present invention is to provide a circuit breaker that facilitates assembly work such as arrangement of constituent members and locking of members, and can also realize automatic assembly.

Other objects and advantages of the present invention will become apparent as the description of the embodiments below proceeds.

[0007]

A circuit breaker according to claim 1, wherein a handle having a connecting portion and pivotally supported at a first reference position, and a spring receiving portion are provided at the connecting portion of the handle. A movable contact having one end rotatably held and a movable contact attached to the other end; a fixed contact having a fixed contact that is opened and closed by the movable contact of the movable contact; A cradle pivotally supported at a second reference position by means of a locking portion; an abnormal current detecting means having a locking receiving portion that releasably locks with the locking portion of this cradle; The movable contact is closed to the fixed contact by being compressed and suspended between the spring receiving portion and the spring receiving portion of the cradle, and the locking portion of the cradle is locked by the abnormal current detecting means. When locked in the receiving part, the movable contact and the fixed contact When a contact pressure is applied between the movable contact and the movable contact in a direction in which the movable contact is opened from the fixed contact when the locking portion of the cradle is released from the locking receiving portion of the abnormal current detecting means. And a reversing spring for reversing the cradle to rotate.

A circuit breaker according to a second aspect of the present invention is the circuit breaker according to the first aspect, which has a casing including a casing body having a housing chamber into which the interior member group can be incorporated, and a cover provided over the casing body. is there. Claim 3
The circuit breaker according to claim 2, wherein a mounting frame is installed in the accommodation chamber of the casing body, and a fixed shaft pivotally supporting the handle at a first reference position is provided between the casing body and the mounting frame. Installed at the second reference position of one end of the mounting frame, a pivoting ear portion pivotally supporting one end of the cradle is provided, and the abnormal current detecting means is attached to the other end of the mounting frame. The mounting ear portion is provided.

According to a fourth aspect of the present invention, there is provided the circuit breaker according to the third aspect, wherein the spring bearing portion of the movable contactor and the spring bearing portion of the cradle are provided at respective centers.
A circuit breaker according to a fifth aspect of the present invention is the circuit breaker according to the second aspect, wherein a detection switch is arranged in a space adjacent to the movable contactor and the cradle in the accommodation chamber.

A circuit breaker according to claim 6 is the circuit breaker according to claim 5, wherein the detection switch is in an open position so as to detect at least one of an open state and a trip state between the movable contact and the fixed contact. At least one of the movable contactor and the cradle in the stationary position is provided so as to be capable of detecting. The circuit breaker according to claim 7 is the circuit breaker according to claim 2, wherein a pivotal support portion at one end of the cradle pivotally supported at the second reference position is positioned adjacent to the movable contactor when closed. A leg portion that is arranged and forcibly opens the movable contactor during a trip operation is extended near the pivotal support portion.

A circuit breaker according to an eighth aspect is the circuit breaker according to the third aspect, wherein a pivotal support portion at one end of the cradle pivotally supported at the second reference position is positioned adjacent to the movable contactor when closed. And a leg portion forcibly opening the movable contactor at the time of trip operation is extended near the pivotal support portion.

[0012]

According to the circuit breaker of the first aspect, when the handle is opened and closed, the movable contactor is opened and closed by the reversing operation of the reversing spring, and when an abnormal current flows, the locking portion of the cradle operates as the abnormal current detecting means. The cradle is disengaged from the lock receiving portion and the spring force of the reversing spring rotates the cradle about the second reference position. As a result, the movable contact of the movable contactor is tripped and opened. In this case, since the reversing spring is compressed and interposed between the cradle and the movable contactor, the assembly work such as the arrangement of the constituent members and the mutual engagement of the members can be facilitated and, in comparison with the case where the tension spring is used, Since the assembling becomes easy and the mass productivity can be enhanced, the cost can be reduced.

According to the circuit breaker of claim 2, claim 1
2. The casing according to claim 1, further comprising: a casing body having a housing chamber into which the interior member group can be incorporated, and a cover covering the casing body.
Has the same effect as. According to the circuit breaker of claim 3, in claim 2, a mounting frame is installed in the accommodation chamber of the casing body, and a fixed shaft that pivotally supports the handle at a first reference position is the casing body and the casing frame. A pivot ear portion that is installed between the mounting frame and pivotally supports one end of the cradle is provided at the second reference position at one end of the mounting frame, and the abnormality is provided at the other end of the mounting frame. Since the mounting ears for mounting the current detecting means are provided, the positional accuracy of the interior member group such as the handle and the cradle is improved, and the operation can be confirmed before closing the opening of the casing body with the cover. Further, since the fixed shaft of the handle is supported by the casing body and the mounting frame, the handle is not obstructed when assembling the components to be mounted on the mounting frame, which facilitates the assembly.

According to the circuit breaker of claim 4, claim 3
In, since the spring receiving portion of the movable contactor and the spring receiving portion of the cradle are provided at the center of each,
Easy to install reverse spring. According to the circuit breaker of claim 5, in claim 2, since the detection switch is arranged in the space adjacent to the movable contactor and the cradle in the accommodation chamber, the empty space can be effectively used, There is no need to upsize the casing.

According to the circuit breaker of claim 6, claim 5
In the above, the detection switch is connected to at least one of the movable contact in the open position and the cradle in the stationary position so as to detect at least one of an open state and a trip state between the movable contact and the fixed contact. Since it is provided so as to be capable of detecting, the presence or absence of the open / closed state and the tripped state can be detected by detecting the states of the movable contactor and the cradle, and the state can be identified at a remote place.

According to the circuit breaker of claim 7, claim 2
In, the pivotal support portion at one end of the cradle pivotally supported at the second reference position is disposed so as to be adjacent to the movable contactor at the time of closing, and the movable contactor is forced during the trip operation. Since the leg part to be opened is extended near the pivotal support part, it is possible to increase the opening force of the movable contact at the time of abnormal current without increasing the number of parts, and prevent the inability to cut off due to contact welding. Moreover, the contact opening speed of the movable contact can be increased to improve the performance.

According to the circuit breaker of claim 8, claim 3
In, the pivotal support portion at one end of the cradle pivotally supported at the second reference position is disposed so as to be adjacent to the movable contactor at the time of closing, and the movable contactor is forced during the trip operation. Since the leg part to be opened is extended near the pivotal support part, it is possible to increase the opening force of the movable contact at the time of abnormal current without increasing the number of parts, and prevent the inability to cut off due to contact welding. Moreover, the contact opening speed of the movable contact can be increased to improve the performance.

The present invention will be described below with reference to embodiments, but it is to be understood that the present invention is not limited to these embodiments and includes design modifications included in the appended claims.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, the circuit breaker 10 includes a casing 11, a manual opening / closing means 12, an opening / closing contact means 13, and an abnormal current detecting means 14 forming a trip means. The casing 11 includes a casing body 15 and a cover 16 that covers the casing body. The casing body 15 includes a manual opening / closing means 12 and an opening / closing contact means 13.
In addition, the housing portion 17 for the abnormal current detection means 14 and the like is partitioned. The cover 16 is formed by assembling the above-mentioned interior member group into the accommodation chamber 17 of the casing body 15 and then
A plurality of (18 in the illustrated embodiment) pins 18a-18
fixed by d. A window 19 for a handle is formed on the upper wall of the casing body 15, a fixed contactor / terminal fitting mounting portion 21 including a guide channel 20 is formed on one side wall, and a guide slit 22 is formed on the other end wall. The load terminal / terminal fitting mounting portion 23 including the load terminal / terminal fitting mounting portion 23 is formed. Further, in the accommodation chamber 17, preferably, near the above-mentioned one side wall, a mounting portion 24 is seated, and an end portion of a mounting projection 25 provided upright in the central portion of the accommodation chamber 17 is engaged with a corresponding hole 26. The mounting frame 27 is installed so as to extend toward the other side wall. A cradle pivot support ear 28 is provided at one end of the attachment frame 27, and an abnormal current detecting means attachment ear 29 is provided at the other end.

The manual opening / closing means 12 includes a handle 30 and a cradle 31, and the handle 30 has a body portion 3 having an arcuate surface slidable along the edge of the handle window 19.
2, the operation portion 33 protruding from the handle window 19 is provided upright on the body portion 32, and the operation portion 33 is provided downwardly on the base portion 34.
Is inflated. The base 34 is provided with a shaft hole.
At the reference position, the base portion 34 is pivotally supported by the fixed shaft 35 extending over the corresponding hole of the mounting frame 27 and the corresponding bearing recess of the casing body 15. The cradle 31 has an L-shape as a whole, and a forced opening leg 31a is extended at one end thereof, and in the vicinity of the cradle 31, a cradle pivot support ear portion 28 projecting at a second reference position of the mounting frame 27 is pivoted. A supporting portion 36 that is supported is provided, and a locking portion 37 at the other end extends toward the other side wall of the casing body 15 beyond the fixed shaft 35 located at the first reference position when viewed from the front.

The open / close contact means 13 includes a movable contact 38 and a fixed contact 39, and the movable contact 38 has a pivot pin 40 serving as a connecting portion fixed to the upper end of the handle 30. It is engaged with a corresponding shaft hole formed in the center of the body portion 32, is connected to the handle 30 so as to be relatively movable, and has a movable contact 41 fixedly provided at the lower end portion. On the other hand, the fixed contactor 39 is fitted and fixed in the guide channel 20 formed in one side wall of the casing body 15, and the movable contact 41 and the openable / closable fixed contact 42 are fixedly provided at one end thereof so that the fixed contactor 39 is accommodated in the accommodation chamber 17. And the other end is extended outward from the accommodation chamber 17 and the terminal fitting 43 for the power supply is mounted.
In addition, the compressed reversing spring 4 is provided between the spring receiving portions 44 and 45 at the central portions of the cradle 31 and the movable contact 38.
6, the reversing spring 46 provides a suitable contact pressure between the movable contact 41 and the fixed contact 42 when the opening / closing contact means 13 is closed during normal operation, as will be described later. When an abnormal current is detected, the fixed contact 42 and the movable contact 41 are opened to invert.

The abnormal current detecting means 14 has a bimetal 47.
And the tripping piece 48 made of a magnetic material are included, and the upper end of the bimetal 47 is the mounting ear portion 29 of the other end portion of the mounting frame 27.
The lower end of the trip piece 48 is connected to the lower part of the bimetal 47, preferably via a spring piece 49. Further, a U-shaped suction piece 50 made of a magnetic material is fixedly provided substantially at the center of the bimetal 47. Cradle 31 on trip piece 48
Is formed with a locking hole 51 which is a locking receiving portion for engaging the locking portion 37 of the device during normal operation, and is pulled in response to the bending motion of the bimetal 47 or the suction motion of the suction piece 50 when an abnormal current is detected. When the removal piece 48 is displaced toward the bimetal 47 side, the locking portion 37 of the cradle 31 can be pulled out from the locking hole 51. In addition, the bimetal 47 is connected to the movable contact 38 via a sufficiently flexible connecting wire 52 such as a twisted wire, and is also connected to the load terminal board 54 via another similar connecting wire 53. The load terminal plate 54 extends outwardly from the accommodation chamber 17 while being inserted into the guide slit 22 formed in the other end wall of the casing body 15, and the load terminal metal fitting 55 is attached thereto.

In addition, a detection switch 56 is provided in the vicinity of the lower portion of the abnormal current detection means 14, and the detection switch 56 is preferably a micro switch.
Further, the actuator 57 of the detection switch 56 extends to the opening / closing contact means 13 side, the movable contact 38 swivels with respect to the fixed contact 39 in the opening direction, and the casing body 15
When it hits the stopper 58 bulged from the movable contact 38
It is provided so that it can contact with. Thereby, the opening operation of the movable contact 38 or the movable contact 41 is detected by the detection switch 56, and the detection signal is transmitted through the lead wire 60 led out from the accommodation chamber 17 through the channel 59 to a suitable display device (not shown). Sent to. In this case, if this display device is installed at a position apart from the circuit breaker 10, the operating state of the circuit breaker 10 can be visually recognized at the installation position.

Next, an example of an assembling procedure of the circuit breaker shown in FIGS. 1 to 4 will be described. First, the casing body 15
The fixed contact 39 is inserted and fixed to the guide channel 20 on the side of the fixed contact / terminal fitting mounting portion 21 of one side wall. Next, the fixed shaft 35 is inserted into the shaft hole of the base 34 of the handle 30.
, And one end of the fixed shaft 35 is fitted into a bearing recess formed in the casing body 15 at the first reference position. On the other hand, before the casing body 15 is assembled, the upper portion of the bimetal 47 is fixed to the mounting ear portion 29 of the mounting frame 27 in advance, and the suction piece 50 is attached to the central portion of the bimetal 47.
Is attached and the trip piece 48 is connected to the base of the bimetal 47 with the spring 49 interposed therebetween, the connection wire 52 is interposed with the base of the bimetal 47 to connect with the movable contact 38, and on the upper part of the bimetal 47. The interior assembly is assembled and set by connecting the load terminal plate 54 via the connection line 53, and the interior assembly is arranged in the accommodation chamber 17 of the casing body 15. At this time, the mounting frame 27
The other end of the fixed shaft 35 is fitted into the corresponding hole, and the end portion of the mounting projection 25 is fitted into the corresponding hole 26 to be seated appropriately. At the same time, the load terminal plate 54 is inserted and fixed in the slit 22 of the load terminal / terminal fitting mounting portion 23 on the other end wall of the casing body 15. Next, the pivot pin 40 fixed to the upper portion of the movable contact 38 is inserted into the central shaft hole of the body 32 of the handle 30. Next, the supporting portion 36 of the cradle 31 is pivotally supported by the cradle pivotally supporting ear portion 28 provided at the second reference position of the mounting frame 27, and is compressed between the spring receiving portions 44 and 45 of the cradle 31 and the movable contact 38. After suspending the reversing spring 46, the engaging portion 37 of the cradle 31 is tripped and engaged with the engaging hole 51 of the piece 48. Next, the fixed contacts 39 and the load terminal plate 54 are respectively attached to the terminal fittings 43, 55.
Put on. Next, the detection switch 56 is appropriately installed by the actuator 57 so that the opening operation of the movable contact 38 can be detected, and the lead wire 60 is pulled out from the channel 59 of the casing body 15. Finally, the normal operation state of the opening / closing operation of the opening / closing contact means 13 and the trip operation of the abnormal current detection means 14 is tested, and then the cover 16 is attached to the casing body 15 and the plurality of pins 18a to 18d.
Then, the circuit breaker 10 is fixed and the assembly of the circuit breaker 10 is completed.

The operation of the circuit breaker 10 will be further described.
Now, when the handle 30 is operated along the handle window 19 of the casing body 15, the handle 30 will move to the operating portion 33.
The fixed shaft 35 located at the first reference position is rotated about the support shaft until it contacts one edge of the handle window 19. At this time, the support 36 at one end of the cradle 31 is attached to the second portion of the mounting frame 27.
Of the cradle 31 is pivotally supported by the cradle pivotal ear 28 at the reference position and the locking portion 37 at the other end is engaged with the locking hole 51 of the trip piece 48, and is in a stationary state, and between the cradle 31 and The movable contactor 38, which is linked with the compressed reversing spring 46 interposed therebetween, swings around the fixed shaft 35 as the handle 30.
The lower portion of the movable contactor 38 swings in the same direction as the operating portion 33 of the handle 30 because it is connected to the vicinity of the body portion 32 via the pivot pin 40. As a result, the movable contact 41 of the movable contact 38 contacts the fixed contact 42 of the fixed contact 39, as shown in FIG. 1, and the open / close contact means 13 is closed.
Here, a line of action OL indicated by a chain line in the figure, that is, a line connecting the pivot pin 40 and the spring receiving portion 45 on the movable contact 38 is displaced toward the fixed contact 39 side beyond the first reference position, Therefore, the spring force of the reversing spring 46 is applied between the movable contact 41 and the fixed contact 42 so as to obtain a suitable contact pressure, and the opening / closing contact means 13 is stabilized in the closed state.

On the other hand, the handle 30 is attached to the casing body 15
When it is operated in the opposite direction along the handle window 19 of FIG. 3, the lower end 3 of the body portion 32 of the handle 30 as shown in FIG.
Until the 2a contacts the cradle 31, the fixed shaft 35 at the first reference position is rotated about the support shaft. Along with this, the lower part of the movable contact 38 swings in the direction away from the fixed contact 39 and until it hits the stopper 58, and when the line of action OL exceeds the first reference position, the reversing spring 46 reverses and moves. The movable contact 41 of the contact 38 is a fixed contact 42 as shown in FIG.
On the other hand, the open / close contact means 13 is stabilized in the open state. At this time, the opening operation of the movable contact 38 is detected by the detection switch 56 via the actuator 57, and the detection signal is sent to the outside via the lead wire 60.

If an overcurrent of a predetermined value or more continues to flow in the circuit breaker 10 when the switching contact means 13 is in the closed state, the bimetal temperature in the bimetal 47 rises due to Joule heat, and the bimetal 47 bends. Along with this bending, the tripping piece 48 interlocks via the spring piece 49 and is displaced in the direction away from the switching contact means 13. Cradle 3 at this time
The locking portion 37 at the other end of 1 disengages from the locking hole 51 of the pullout piece 48, and the cradle 31 receives the spring force of the compressed reversing spring 46 and pivots clockwise with the cradle pivotally supporting ear portion 28 as a fulcrum. . As the cradle 31 turns, the compulsory opening leg 31a of the cradle 31 moves relative to the movable contact 38 to the movable contact 3
8 in the direction of separating from the fixed contact 39, and the reversing spring 46 also moves the movable contact 38 and its movable contact 4
1 is moved in the reverse direction so as to move 1 from the fixed contact 39 and its fixed contact 42 in the opening direction, and the opening / closing contact means 13 is forcibly opened as shown in FIG.

When a short-circuit current flows through the circuit breaker 10 when the switching contact means 13 is in a closed state, a large current passing through the bimetal 47 causes the suction piece 50 made of a magnetic material attached to the bimetal 47 and the tripping. A magnetic circuit is formed on the piece 48, and the trip piece 48 is sucked by the suction piece 50.
The tripping piece 48 is displaced in the direction away from the switching contact means 13. Along with this, the locking portion 37 at the other end of the cradle 31 is disengaged from the locking hole 51 of the tripping piece 48, and the cradle 31 and the movable contact 38 are operated in substantially the same manner as when the above-mentioned overcurrent continues to flow. Then, the switching contact means 13 is forcibly opened as shown in FIG.

When an overcurrent or a short-circuit current flows to enter a trip state and the movable contact 38 is opened, that state is detected by the detection switch 56 and a detection signal is sent out. Further, even if the trip piece 48 is displaced due to overcurrent or a short circuit current, when the current flowing through the circuit breaker 10 returns to a normal value, the bimetal 47 is restored or the trip piece 48 is released from the suction force. Since the piece 48 returns to its original position, if the handle 30 is rotated clockwise here, the cradle 31 is swung clockwise by the lower end 32a of the body 32, and the locking portion at the other end of the cradle is rotated. 37 can be engaged in the locking hole 51 of the trip piece 48, and the circuit breaker 10 can be restored from the trip state to the state of FIG.

A second embodiment is shown in FIGS. 5 and 6. That is, in this embodiment, the actuator 57A of the detection switch 56A is extended so as to be able to contact the cradle 31. That is, the actuator 57A comes into contact with the lower portion of the cradle 31 when the locking portion 37 at the other end of the cradle 31 is engaged with the locking hole 51 of the trip piece 48, and the locking portion 37 of the cradle 31 releases the trip piece. It is configured so as to be released when it is disengaged from the locking hole 51 of 48 and is in a trip state, so that when the opening / closing contact means 13 is in the closed state as shown in FIG. 5, when the trip state is shown in FIG. A detection signal of the trip state can be sent from the detection switch 56. Other configurations and operations are similar to those of the embodiment shown in FIGS. 1 to 4. In FIGS. 5 and 6, the same components as those of the embodiment of FIGS. 1 to 4 are designated by the same reference numerals. is there.

A third embodiment is shown in FIG. That is, in this embodiment, the detection switch 56B is provided with two actuators 57B1 and 57B2, the first actuator 57B1 is provided so as to be able to contact the movable contact 38 in the open state, and the second actuator 57B2 is stationary. It is provided so as to be able to contact the cradle 30 in the position. Therefore, according to the present embodiment, the first actuator 57
1 to 4 by separating and contacting B1 with the movable contactor 38.
The open / close operation of the open / close contact means 13 and the presence / absence of a trip state due to the second actuator 57B2 coming in contact with / separating from the cradle 30 as in the embodiment of FIG.
Can be sent from. Other configurations and operations are similar to those of the embodiment shown in FIGS. 1 to 4, and in FIG.
The same components as those in the embodiment of FIG. 4 are designated by the same reference numerals.

According to the above-described circuit breaker of the present invention, in particular, by using the reversing spring 46 compressed between the spring receiving portions 44 and 45 of the cradle 30 and the movable contact 38, the reversing spring 46 is used. It is possible to obtain an assembling property that can be automated, such as an assembling procedure, and to enhance mass productivity. Further, the presence or absence of the open / closed state or the tripped state of the open / close contact means 13 can be detected by the detection switch, the state can be identified at a distant place, and the cradle 31 and the movable contact 38 are provided by utilizing the empty space. It will therefore be appreciated that the initial objectives can be achieved without enlarging the casing 11 of the circuit breaker 10.

In the present invention, various design changes are possible. For example, the first and second reference positions or the connecting position between the handle and the movable contactor, in other words, the action line or the reversal position is not limited to the positional relationship shown in the above-mentioned embodiment, and the same action as that of the above-described configuration can be obtained. Various positional relationships can be obtained. Further, in the embodiment of FIG. 7, the open / closed state of the open / close contact means and the presence / absence of the trip state are detected by a single detection switch, but a set of detection switches having a single actuator can be adopted.

[0034]

According to the circuit breaker of claim 1, since the reversing spring is interposed between the cradle and the movable contactor by compression,
Assembling work such as arranging components and locking members together can be facilitated, and automatic assembly is easier than in the case where a tension spring is used, and mass productivity can be enhanced, thus reducing costs. The effect is that you can do it.

According to the circuit breaker of claim 2, claim 1
2. The casing according to claim 1, further comprising: a casing body having a housing chamber into which the interior member group can be incorporated, and a cover covering the casing body.
Has the same effect as. According to the circuit breaker of claim 3, in claim 2, a mounting frame is installed in the accommodation chamber of the casing body, and a fixed shaft that pivotally supports the handle at a first reference position is the casing body and the casing frame. A pivot ear portion that is installed between the mounting frame and pivotally supports one end of the cradle is provided at the second reference position at one end of the mounting frame, and the abnormality is provided at the other end of the mounting frame. Since the mounting ears for mounting the current detecting means are provided, the positional accuracy of the interior member group such as the handle and the cradle is improved, and the operation can be confirmed before closing the opening of the casing body with the cover. Further, since the fixed shaft of the handle is supported by the casing body and the mounting frame, the handle is not obstructed when assembling the components to be mounted on the mounting frame, which facilitates the assembly.

According to the circuit breaker of claim 4, claim 3
In, since the spring receiving portion of the movable contactor and the spring receiving portion of the cradle are provided at the center of each,
Easy to install reverse spring. According to the circuit breaker of claim 5, in claim 2, since the detection switch is arranged in the space adjacent to the movable contactor and the cradle in the accommodation chamber, the empty space can be effectively used, There is no need to upsize the casing.

According to the circuit breaker of claim 6, claim 5
In the above, the detection switch is connected to at least one of the movable contact in the open position and the cradle in the stationary position so as to detect at least one of an open state and a trip state between the movable contact and the fixed contact. Since it is provided so as to be capable of detecting, the presence or absence of the open / closed state and the tripped state can be detected by detecting the states of the movable contactor and the cradle, and the state can be identified at a remote place.

According to the circuit breaker of claim 7, claim 2
In, the pivotal support portion at one end of the cradle pivotally supported at the second reference position is disposed so as to be adjacent to the movable contactor at the time of closing, and the movable contactor is forced during the trip operation. Since the leg part to be opened is extended near the pivotal support part, it is possible to increase the opening force of the movable contact at the time of abnormal current without increasing the number of parts, and prevent the inability to cut off due to contact welding. Moreover, the contact opening speed of the movable contact can be increased to improve the performance.

According to the circuit breaker of claim 8, claim 3
In, the pivotal support portion at one end of the cradle pivotally supported at the second reference position is disposed so as to be adjacent to the movable contactor at the time of closing, and the movable contactor is forced during the trip operation. Since the leg part to be opened is extended near the pivotal support part, it is possible to increase the opening force of the movable contact at the time of abnormal current without increasing the number of parts, and prevent the inability to cut off due to contact welding. Moreover, the contact opening speed of the movable contact can be increased to improve the performance.

[Brief description of drawings]

FIG. 1 is an internal front view with a cover removed when a switching contact of a first embodiment of a circuit breaker according to the present invention is in a closed state.

FIG. 2 is an exploded perspective view thereof.

FIG. 3 is a front view of the inside of the circuit breaker with the cover removed when the switching contacts of the circuit breaker are in the open state.

FIG. 4 is an internal front view with a cover removed when the circuit breaker is detecting an abnormal current.

FIG. 5 is an internal front view with a cover removed when a switching contact according to a second embodiment is in a closed state.

FIG. 6 is an internal front view with a cover removed when the circuit breaker is detecting an abnormal current.

FIG. 7 is an internal front view with a cover removed when the opening / closing contacts of the third embodiment are in a closed state.

[Explanation of symbols]

14 Abnormal current detection means 30 handles 31 cradle 37 Locking part 38 Movable contact 39 Fixed contact 40 Pivot pin to be the connecting part 41 Moving contact 42 fixed contact 44,45 Spring receiving part 46 Inversion spring 51 Locking hole that serves as a lock receiving

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoichi Aoyama             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Yukihiro Matsuoka             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Tatsuo Hiroshima             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation

Claims (8)

[Claims] 1. A handle having a connecting portion and pivotally supported at a first reference position; and a spring contact portion, one end of which is rotatably held at the connecting portion of the handle and the other end of which is a movable contact. A movable contactor attached to the movable contactor, a fixed contactor having a fixed contact that is opened and closed by the movable contact of the movable contactor, a spring receiving portion and a locking portion, Abnormal current detecting means having a pivotally supported cradle, a locking receiving portion that releasably locks with the locking portion of the cradle, the spring receiving portion of the movable contactor, and the spring receiving portion of the cradle. When the movable contact is closed by being compressed and suspended between the fixed contact and the locking portion of the cradle is locked to the locking receiving portion of the abnormal current detecting means, the movable contact is And contact pressure between the fixed contact and the fixed contact When the locking portion is released from the locking receiving portion of the abnormal current detecting means, the movable contact and the cradle are reversed so as to rotate from the fixed contact to the direction in which the movable contact is opened. Circuit breaker with reversing spring. 2. The circuit breaker according to claim 1, further comprising a casing body including a casing body having a housing chamber into which the interior member group can be incorporated, and a cover provided over the casing body. 3. A mounting frame is installed in the accommodation chamber of the casing body, and a fixed shaft for pivotally supporting the handle at a first reference position is installed between the casing body and the mounting frame. A pivot ear portion for pivotally supporting one end portion of the cradle is provided at the second reference position at one end portion of the frame, and a mounting ear portion for mounting the abnormal current detecting means is provided at the other end portion of the mounting frame. The circuit breaker according to claim 2, which is provided. 4. The circuit breaker according to claim 3, wherein the spring receiving portion of the movable contactor and the spring receiving portion of the cradle are provided at respective centers. 5. The circuit breaker according to claim 2, wherein a detection switch is arranged in a space adjacent to the movable contactor and the cradle in the accommodation chamber. 6. The detection switch detects the at least one of an open state and a trip state between the movable contact and the fixed contact, and detects the movable contact in the open position and the cradle in the stationary position. The circuit breaker according to claim 5, wherein the circuit breaker is provided so that it can detect at least one of them. 7. The pivotal support portion at one end of the cradle pivotally supported at the second reference position is arranged so as to be adjacent to the movable contactor at the time of closing, and the movable contactor at the time of trip operation. The circuit breaker according to claim 2, wherein the leg portion forcibly opening the child is provided in the vicinity of the pivot portion. 8. The pivotal support portion at one end of the cradle pivotally supported at the second reference position is disposed so as to be adjacent to the movable contactor when closed, and the movable contactor is provided during trip operation. The circuit breaker according to claim 3, wherein the leg portion forcibly opening the child is provided in the vicinity of the pivot portion.