JP2000040458A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent recognition error that it is open at tripping when contacts are welded. SOLUTION: A cooperating part 61 cooperating with a switch mechanism part 2 is provided to a movable body 5 so that a handle 17 is stopped in an intermediate position between the on-position and the off-position as the handle 18 is moved from the on-position to the off-position by a handle return spring 8, When a trip body 3 releases locking with an operator 20 by the operation of an abnormal current detecting device 7 under the condition that a movable contact point 38 and a fixed contact point 51 are welded. Further, a hooking piece 60 is provided to the movable body 5 so as to hook on the surface of a movable contact 4 opposite to the a fixed contact 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having a movable body which moves up and down by operating a handle.

[0002]

2. Description of the Related Art As a conventional example, Japanese Patent Publication No. 61-45337, for example, discloses an opening and closing mechanism comprising a handle, a link and an actuator.
A movable body pressed by the actuator, a movable contact with a return spring pressed by the movable body, and a tripping body for detecting an abnormal current engaged with the actuator; The tripping body, the movable contact, and the movable body are configured in a uniform relationship by a return spring.

A movable contact is turned on and off via an operating element and a movable element by rotating a handle, and a tripping element operates to break the uniformity of the operating element in an accident due to an abnormal current. The child is forcibly opened, and at the same time, the handle is returned to the off position by the handle return spring.

[0004]

However, this circuit breaker has a structure in which the movable body is completely separated from the switching mechanism. Therefore, even when an abnormal current flows and the movable contact is welded to the fixed contact, the handle is moved to the off position. As described above, even if the contacts are in the welded state, the handle is in the OFF state, so that the user may erroneously recognize that the contacts are in the open state from the positional relationship of the handle, and the safety is reduced. I have.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a circuit breaker which can prevent erroneous recognition that an electrode is in an open state at the time of contact welding and can improve safety.

[0006]

According to a first aspect of the present invention, there is provided a circuit breaker having a handle rotatably supported in a case, an engagement portion provided at one end, and a link to the handle via a link. An opening / closing mechanism having an actuator connected to the actuator, and an engagement piece engaging with the engagement portion of the actuator, and rotating so that the engagement piece can be disengaged from the engagement portion. Freely provided,
A tripping member spring-biased in the direction of the actuator, a movable contact having a movable contact, and biased in the opening direction by a return spring; and the other end of the actuator and the movable member. The movable contact is disposed so as to be movable between the movable contact and the other end of the movable contact in the opening direction of the movable contact, and the movable contact of the movable contact is pressed by the movable contact. By rotating the handle from the off position to the on position while the mating portion is engaged with the engagement piece, the handle is pushed by the other end of the actuator in the closing direction of the movable contact, A movable body that presses the movable contact to a closed position against the return spring and brings the link into an inverted state; and a fixed contact that contacts the movable contact at the closed position of the movable contact. Abnormal current such as overcurrent or short-circuit current in the circuit, and An abnormal current detection device for driving the tripping body so as to release the engagement between the engagement portion and the engagement piece; and a handle return spring capable of rotating the handle in an off direction in a non-inverted state of the link. A circuit breaker having the movable contact and the fixed contact welded to each other, when the tripping member releases the engagement with the actuator by the operation of the abnormal current detection device, When the handle is moved from the on position to the off position by the return spring, a linking part linked to the opening / closing mechanism is attached to the movable body so that the handle stops at an intermediate position between the on position and the off position. The movable member is provided with a hooking piece which can be hooked on a surface of the movable contact facing the fixed contact.

According to the circuit breaker of the first aspect, when an abnormal current is detected by the abnormal current detecting device, the engaging piece of the tripping body and the engaging portion of the operator are disengaged, and the operator is released. As a result, the balance in the inverted state of the link is broken, and the handle starts to move in the off direction by the handle return spring. At this time, if the movable contact is welded to the fixed contact due to an abnormal current, the hook of the movable body is engaged with the movable contact, and the link of the movable body is linked to the opening / closing mechanism, so that the handle is in the off position. Cannot be moved to the position, and stops at a substantially intermediate position between the ON position and the OFF position. For this reason, the trip state due to the abnormal current can be displayed by the handle, and it is possible to prevent erroneous recognition that the contact point is in the open state, thereby improving safety.

According to a second aspect of the present invention, in the circuit breaker according to the first aspect, the linking portion is linked to an armature connecting portion side of the link. According to the circuit breaker of the second aspect, the same effect as that of the first aspect is obtained. According to a third aspect of the present invention, in the circuit breaker according to the first aspect, the linking portion is linked to the other end of the actuator.

According to the circuit breaker of the third aspect, the same effect as that of the first aspect is obtained.

[0010]

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 includes a case 1, an opening / closing mechanism 2, a trip body 3, a movable contact 4, a movable body 5, a fixed contact 6, an abnormal current detecting device 7, a handle return, and the like. And a spring 8.

As shown in FIG. 3 in the embodiment, the case 1 comprises a base 9 and a cover 10 and is connected by a connecting member (not shown). The cover 10 has a handle hole 11 at the center, a terminal operation hole 12 at both ends, and an electric wire insertion hole 13 formed by cutting out the boundary between the cover 10 and the base 9 at both ends. This case 1 is 2
For terminal use, a pair of terminals 1
4 and 15 are installed.

The opening / closing mechanism 2 has a handle 17 rotatably supported in the case 1, and is provided with an engaging portion 19 at one end and an actuator 20 connected to the handle 17 via a link 18. Having. The handle 17 of the embodiment is pivotally supported by a pin 21 inserted into a hole 24 of the handle 17 into a hole 23 at an upper end of the fixing base 22 so that the handle operation portion 17a projects outside the handle hole 11 of the cover 10. Have been. Reference numeral 17b (see FIG. 4) denotes an actuator reset unit.
The fixed base 22 is attached to the center of the base 9 through a mounting hole 31 by a fixture (not shown). Handle 17
A link insertion hole 25 is provided on the side opposite to the handle operation portion 17a with the hole 24 therebetween, and one end of the link 18 is inserted. The link 18 has a U-shape, and the other end is formed longer than one end. The other end of the link 18 is inserted into the hole 26 in the middle part of the actuator 20, and is slidably guided by a vertical slit 45 formed in the fixed base 22. As described above, the actuator 20 has the engaging portion 19 at one end and the movable body pressing portion 28 at the other end.

The tripping body 3 has an engaging piece 29 which engages with the engaging portion 19 of the actuator 20, and the engaging piece 29 is
The armature 2 is provided rotatably so that it can be disengaged from the
The spring is biased in the direction of 0. In the embodiment, the pin 30 is inserted through the hole 32 formed at the lower end of the tripping body 3, and is inserted through the support hole 33 formed at the lower part of the fixing base 22 so as to rotate in the direction in which the terminals 14 and 15 are arranged. It is movably supported. The engaging piece 29 is provided at an intermediate height position toward the engaging portion 19 of the actuator, and a bimetal gap adjusting screw 34 is provided at the upper end of the tripping body 3. The tripping body 3 has a winding portion of a spring 35 using a wire spring passed through a pin 30 and one end of the tripping body 3 is locked to the fixing base 22, and the other end is urged in a direction in which the engaging piece 29 approaches the engaging portion 19. are doing.

The movable contact 4 has a movable contact 38 and is urged in the opening direction by a return spring 37. In the embodiment, the movable contact 4 is formed by a leaf spring,
2 are arranged on the base 9 on both sides, and a mounting screw 47 is provided at one end.
Through the hole 40 of the pedestal 9 near the terminal 15 and fastened and fixed by a nut 42 arranged on the back side of the pedestal 9. The return spring 37 uses a compression coil spring and is interposed between the intermediate portion of the movable contact 4 and the concave portion 41 of the base 9.

The movable body 5 is movably disposed between the other end of the actuator 20 and the movable contact 4, and is located in the opening direction of the movable contact 4 and the movable body 5 of the opening and closing mechanism 2. Pushed by the movable contact 4 toward the other end,
When the handle 17 is turned from the off position to the on position in a state where the engagement portion 19 of the movable contact 4 is engaged with the engagement piece 29, the movable contact 4 is pushed by the operator 20 in the closing direction of the movable contact 4, and The contact 4 is pressed against the return spring 37 to the closed position, and the link 18 is brought into an inverted state. In the embodiment, the movable body 5 is provided movably in the vertical direction in a vertical guide groove 46 formed in the central portion of the base 9, and the actuator receiving portion 5 a is provided on the movable body pressing portion 28 of the actuator 20. It is opposed and pushed up by the movable contact 4. In the inverted state of the link 18, as shown in FIG. 1, the handle side, which is one end of the link 18, is located beyond the line L connecting the pin 21 and the other end (18 a) of the link 18. 4. The handle 17 is rotated and urged in the opposite direction to the off direction by the force applied to the link 18 via the movable body 5 and the actuator 20 of the opening / closing mechanism 2, and is locked to the edge of the handle hole 11. .

Further, the movable body 5 is provided with a hooking piece 60 which can be hooked on the back surface of the movable contact 4 facing the fixed contact 6, and when the handle 17 moves from on to off, the opening / closing mechanism 2 is provided. Is provided with a linking unit 61 that links with. The linking portion 61 of the embodiment is linked to the tip 18a of the link 18 at the other long end of the leg. The fixed contact 6 has a fixed contact 51 that contacts the movable contact 38 at the closed position of the movable contact 4. The base end of the fixed contact 6 of the embodiment is formed integrally with the terminal plate of the terminal 14. 52 is a pin for fixing the fixed contact 6 to the table 9.

The abnormal current detecting device 7 detects an abnormal current such as an overcurrent or a short-circuit current in the electric circuit, and drives the tripping body 3 to release the engagement between the engaging portion 27 and the engaging piece 29. I do. In the embodiment, the base end of the bimetal 55 is attached to the mounting screw 47 of the movable contact 4 using the bimetal 55, and the upper end of the bimetal 55 is placed on the actuator 20 side of the bimetal gap adjusting screw 34 of the tripping body 3. A flexible electric wire 56 is connected between the upper end of the bimetal 55 and the terminal 15.
Connected by

Here, the electric circuit of the circuit breaker is connected to the terminal 15,
It comprises a flexible electric wire 56, a bimetal 55, a movable contact 4, a fixed contact 6, and a terminal 14. When an abnormal current flows through this circuit, the bimetal 55 is self-heated,
The gap adjusting screw 34 is bent in the pushing direction, and the tripping body is pushed against the spring 35 to detach the engaging portion 27 from the engaging piece 29.

The handle return spring 8 is capable of turning the handle 17 in the off direction when the link 18 is not inverted. In other words, when the link 18 is in an inverted state, the handle 17 is weaker than the force for urging the handle 17 in the opposite direction to the off direction, and the handle 17 is operated in the off direction or the tripping body 3 is tripped from the actuator 20 to operate. In the non-reversed state, the handle 17 is rotated in the off direction by the handle return spring 8. In the embodiment, a wire spring is used, an intermediate winding portion is passed through the pin 21, one end is locked on the handle 17, the other end is locked on the fixed base 22, and the handle 17 is urged in the off direction. I have.

The operation of the circuit breaker will be described.
1 and 2 show the ON state. The engaging portion 19 of the operating member 20 is engaged with the engaging piece 29 of the tripping body 3, and the handle 17 is rotated counterclockwise about the pin 21 so that the operating member 20 side of the link 18 is vertically slit 45. , Whereby the movable body 5 is pushed downward, the movable contact 4 is pushed down against the return spring 37, and the movable contact 38 is brought into contact with the fixed contact 51. At the same time, the handle side of the link 18 moves to the reversing position beyond the line L, and the handle 17 is locked in the handle hole 11, whereby the opening / closing mechanism 2, the tripping body 3, the movable body 5, and the movable contact 4 are moved. Return spring 3
7 turns on evenly. When the electric circuit is closed, current can flow between the terminals 14 and 15 and power can be supplied to the load.

FIG. 4 shows an off state. When the handle 17 in the ON state in FIG. 1 is rotated clockwise, the handle side of the link 18 moves from the inverted position to beyond the line L to the non-inverted position. As a result, the movable contact 4
Is pushed up in the opening direction, and the operator side of the link 18 moves upward through the vertical slit 45 via the movable body 5 and the operator 20. This opens the electrical circuit. The operation from the off state to the on state is performed by operating the handle 17 from the state shown in FIG. 4 to the state shown in FIG.

FIG. 5 shows a trip state, before the contacts are separated, or a state of contact welding. When an abnormal current exceeding the overcurrent flows in the electric circuit in the ON state of FIG.
Generates a bending motion and pushes the gap adjusting screw 34 to rotate the tripping body 3 about the pin 30, and the engaging piece 29 is disengaged from the engaging portion 19 of the actuator 20. Thereby, the actuator 2
0 rotates clockwise around the actuator side of the link 18,
As a result, the movable body 5 can move upward, the movable contact 4 starts opening, and the handle 17 is turned to the off position shown in FIG. As the handle 17 moves to the off position, the operator side of the link 18 is pulled upward in the vertical slit 45, and the operator 20 is pushed by the operator reset portion 17b. By rotating clockwise, the engaging portion 19 moves from the state of FIG. 5 to the position of FIG.

When the contact is welded, the movable contact 4 does not open, and when the handle 17 is turned in the off direction by the handle return spring 8, the tip 18a of the link 18 on the operator side is linked to the movable body 5. When the movable body 5 is to be pulled up by engaging with the portion 61, the hooking portion 60 of the movable body 5 is engaged with the movable contact 4. Therefore, the handle 17 cannot rotate to the off position and stops at an intermediate position between the on position and the off position.

As a result, the handle 17 can indicate that the vehicle is in a trip state and that the contact is in a welded state. Therefore, erroneous recognition that the contact is in the open state after tripping can be prevented, and safety can be improved. A second embodiment of the present invention will be described with reference to FIGS. In the circuit breaker according to the first embodiment, the linking section 61 is linked not to the link 18 but to the other end of the actuator 20. That is, in this embodiment, the linking portion 61 is formed so as to surround the actuator receiving portion 5a at the upper end of the movable body 5.
Is formed in a frame shape, and the other end of the actuator 20 is inserted into the frame.

As shown in FIG. 9, when contact welding occurs, the handle 17 is turned in the off direction by the handle return spring 8, the link 18 is pulled up from the vertical slit 45, and the actuator 20 is moved upward. At this time, the movable body pressing portion 28 at the other end of the actuator 20 engages with the linking portion 61 of the movable body 5 to pull up the movable body 5, and the hooking piece 60 is hooked on the movable contact 4. Therefore, the handle 17 stops at the neutral position.

The other points are the same as those of the first embodiment, and the description is omitted. In the present invention, the linking portion of the movable body is not limited to the actuator or the link, and may be a portion that engages with another portion of the opening / closing mechanism 2.

[0027]

According to the circuit breaker of the first aspect, when an abnormal current is detected by the abnormal current detecting device, the engaging piece of the tripping body and the engaging portion of the operator are disengaged, and the operator is disengaged. When released, the uniformity of the link in the inverted state is broken, and the handle starts moving in the off direction by the handle return spring. At this time, if the movable contact is welded to the fixed contact due to an abnormal current, the hook of the movable body is engaged with the movable contact, and the link of the movable body is linked to the opening / closing mechanism, so that the handle is in the off position. Cannot be moved to the position, and stops at a substantially intermediate position between the ON position and the OFF position. For this reason, the trip state due to the abnormal current can be displayed by the handle, and it is possible to prevent erroneous recognition that the contact point is in the open state, thereby improving safety.

According to the circuit breaker of the second aspect, the same effect as that of the first aspect is obtained. According to the circuit breaker of the third aspect, the same effect as that of the first aspect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an ON state according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a state where a cover is removed.

FIG. 3 is an exploded perspective view.

FIG. 4 is a cross-sectional view in an off state.

FIG. 5 is a cross-sectional view of a trip state before contact opening or contact welding.

FIG. 6 is an exploded perspective view of the second embodiment.

FIG. 7 is a cross-sectional view in an ON state.

FIG. 8 is a cross-sectional view in an off state.

FIG. 9 is a cross-sectional view of a trip state before a contact is opened or a contact is welded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Opening / closing mechanism part 3 Tripping body 4 Movable contact 5 Movable body 6 Fixed contact 7 Abnormal current detection device 8 Handle return spring 17 Handle 18 Link 19 Engagement part 20 Actuator 29 Engagement piece 37 Return spring 38 Movable Contact 51 Fixed contact 60 Hook piece 61 Linkage

Claims (3)

[Claims] An opening / closing mechanism having a handle rotatably supported in a case, an engagement portion provided at one end, and an operating element connected to the handle via a link; An engaging piece that engages with the engaging portion of the operating member is provided rotatably so that the engaging piece can be disengaged from the engaging portion, and a spring is provided in the direction of the operating member. A biased trip body, a movable contact having a movable contact, and biased in a direction of opening by a return spring; and a movable contact between the other end of the actuator and the movable contact. The movable contact is pressed by the movable contact toward the other end of the actuator in the opening direction of the movable contact, and the engagement portion of the actuator is engaged with the engagement piece. By rotating the handle from the off position to the on position in the combined state, in the closing direction of the movable contact A movable body pushed by the other end of the actuator to press the movable contact to a closed position against the return spring and bring the link to an inverted state; and closing the movable contact. A fixed contact having a fixed contact in contact with the movable contact at a position, detecting an abnormal current such as an overcurrent or a short-circuit current of an electric circuit,
An abnormal current detection device for driving the tripping body so as to release the engagement between the engagement portion and the engagement piece; and a handle return capable of turning the handle in an off direction in a non-inverted state of the link. In the circuit breaker provided with a spring, in a state where the movable contact and the fixed contact are welded, when the tripping body releases the engagement with the actuator by the operation of the abnormal current detection device, When the handle is moved from the on position to the off position by the handle return spring,
A linking portion linked to the opening / closing mechanism is provided on the movable body so that the handle stops at an intermediate position between the ON position and the OFF position, and a surface of the movable contactor facing the fixed contactor. A hook that can be hooked on the movable body. 2. The circuit breaker according to claim 1, wherein the linking portion is linked to an actuator connecting portion side of the link. 3. The circuit breaker according to claim 1, wherein the link is linked to the other end of the actuator.