JPS6164032A - Small circuit breaker with signal contacts - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a small circuit breaker equipped with a signal contact for issuing an alarm signal when a circuit is interrupted due to overcurrent detection.

[Background of the invention]

Generally, large circuit breakers are equipped with a signal contact for issuing an alarm signal, and the signal contact does not operate when the main contact is opened or closed by manual operation, but only operates when an overcurrent trip occurs. is configured to do so. However, with small circuit breakers (circuit protectors), it is extremely difficult to install signal contacts because they are small and have a complicated configuration, and the tripping force of the overcurrent trip circuit is weak. .

Therefore, conventionally, as in Japanese Patent Publication No. 51-25587 and Japanese Utility Model Application Laid-Open No. 54-61261, there have been proposed devices in which the signal contact can be reliably operated even if the tripping force is weak. However, the above-mentioned special public service
In No. 587, the interlocking plate for operating the signal contact is in contact with the locking arm not only when the main contact is operated manually but also during tripping, so the spring force of the interlocking plate is constantly applied. , acts as a load on the locking arm, main contact opening/closing mechanism, and manual opening/closing handle. In addition, the above-mentioned Utility Model No. 54-61
In No. 261, the operating lever for operating the signal contact is in contact with the movable contact plate to which the movable contact is fixed, so the spring force of the operating lever is applied to the movable contact plate, the out-of-line mechanism, and the operating handle. Acts constantly as a load.

Therefore, in either case, the spring force interacts with the mechanism that opens and closes the main contact and the mechanism that operates the signal contact, which may slow down the operation of the parts and cause them to not operate smoothly.

[Purpose of the invention]

The present invention aims to provide a small circuit breaker with a signal contact, which is capable of operating the signal contact only during a trip operation, and also allows components to operate smoothly, even if the circuit breaker is small. It is something.

[Summary of the invention]

The *1 feature of the present invention is that the operating knob and the link mechanism connected thereto are capable of moving in a substantially linear direction when the operating knob is rotated, and that the operating knob is moved in the linear direction during an overcurrent tribbing operation. A push member having push pins movable in intersecting directions is connected, and the fixed part on the signal contact side has a hooking/unhooking part for the switching lever and is biased to rotate in the direction of the signal contact. It has a roller that pivotally supports the biasing lever, and that can engage with a locking/disengaging portion of the biasing lever, and an extension portion that allows the push pin to move only when the push pin moves during a trip operation; In addition, the switching lever is rotatably mounted so as to close the switch button of the signal contact when the extension part is pushed forward by the push pin, thereby achieving the above object. .

A second feature of the present invention is that, in addition to the first feature, a spring member is attached to the switching lever to allow the switch button of the signal contact to operate in the open state when the switch button is opened. This made it possible to achieve the above objectives.

Furthermore, a third feature of the present invention is that a switching spring is attached to the signal contact, which has one end that extends up to the switch button, and the one end is biased in a direction that closes the switch button, and the link mechanism and movable The connecting portion with the base is provided with a protrusion that can be pushed forward by a part of the link mechanism during the trip operation and engages with one end of the switching spring, and the protrusion is pushed forward by the part of the link mechanism during the trip operation. The above-mentioned object can be achieved by rotatably mounting a pusher F1 having a roller capable of closing the switch button when the switching spring closes the switch button.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1st
6 to 6 show a first embodiment of a small circuit breaker with signal contacts according to the present invention.

- As shown in FIGS. 1 and 2, the small circuit breaker of this embodiment has a main contact part A formed by a fixed contact 15 and a movable contact 18, and a main contact part A for opening and closing the supranuclear contact part A. Tripping mechanism B
has been established.

Specifically, the fixed contact 15 is fixed to the other end of a fixed plate 14 whose one end protrudes outside the case 1 . The movable contact 13 is fixed to one end of the movable base 12. The other end of the movable base 12 is fixed to the case 1 by a fixing pin 18, and is biased by a spring 16 so as to rotate counterclockwise. Therefore,
The movable base 12 rotates around the fixed pin 18, thereby opening and closing the space between the movable contact 13 and the fixed contact 15.

The tripping mechanism B includes an operating handle 2 and a link mechanism (not referenced) whose one end is connected to the operating handle and the other end is connected to the movable table 12. The operation handle 2 has a central portion that is connected to the frame 3 of the overcurrent detection device C.
0 by a pin 8, and is biased by a return spring 4 so as to be able to rotate counterclockwise.

On the other hand, the link mechanism includes a first link 7 whose one end is connected to the lower part of the operating knob 2 by a third pin 3a;
a second link 9 whose one end is connected to the other end of the first link 7 by a second pin 8 and whose other end is connected to the center part of the movable base 12 by an eighth pin 17; and a response member 11 rotatably attached to the shaft. The response member 11 is inserted into the center of the second slot 9 and is engaged with a knife-shaped pin IOK that can be engaged with a retaining portion 7a formed on the other end side of the 11th link 7. .

When this tripping mechanism B is in the state shown in FIG. 12 rotates clockwise against the elastic force of the spring 16, and the semicircular pin 10 of the response member 110 engages with the retaining portion 7a of the first link 7, thereby movable as shown in FIG. The contact 12 is brought into contact with the fixed contact 15, thereby making it possible to close the main contact part A.

Note that when the main contact part A is closed, the movable contact 12 and the fixed contact 1
5 has a wiping function, the hole through which the fixed pin 18 of the movable contact 12 is inserted is formed in an oval shape. Furthermore, when the operating handle 2 is rotated in the direction A in the state shown in FIG. Then, the semicircular pin 10 and the first link retaining portion 7a
By disengaging the movable contact 12 from the fixed contact 15, the main contact portion A can be opened.

Further, the tripping mechanism B can not only open and close the main contact portion using the operating handle 2, but also open the main contact portion when the overcurrent detection device C is tripped. That is, when the main contact part A is in the closed state, the overcurrent detection device C
detects an overcurrent and the movable iron piece 5 rotates counterclockwise around the pin 6. When the movable iron piece 5 rotates counterclockwise around the pin 6, the response member 11 hits the one end 11a of the response member 11, thereby causing the response member 11 to contact the semicircular pin 1.
0 to release the engagement between the half-moon-shaped pin 10 and the first sliding engagement portion 7a, and thus the movable base 12 is rotated counterclockwise by the elastic force of the spring 16. , K so that the main contact portion A can be opened.

The overcurrent detection device C is arranged on the left side of the case 1 in FIG.
A movable core 5 is attached to the frame 3° covering one side of the movable core 5 by the pin 6, and has one end extending above the fixed core 2° and the other end extending below the one end 11a of the responsive member 11, and the movable core 5. It consists of a 5-karat gold spring that urges rotation in the clockwise direction. When the main contact portion A is closed, when an overcurrent flows through the coil 19, the movable iron core 5 is attracted to the fixed iron core 20, thereby enabling a trip operation.

Furthermore, a signal contact 2 is provided to issue an alarm signal when the tripping mechanism B opens the main contact A due to the tripping operation.
He's throwing an 8. The signal contact 28 is mounted in the case 1 at a position below the movable base 12, and is composed of a microswitch.

The signal contact 28 has a switch button 28a at a position opposite to the other end of the movable base 12, and is designed to be opened when the switch button 28a is pressed and to issue an alarm signal when released. It is now closed.

Therefore, in this embodiment, a means is provided for closing the signal contact 28 only when a trip operation occurs.

The means connects a pushing member 21 to the operating handle 2 and the link mechanism.

That is, the pushing member 21 is formed into a substantially dogleg shape as shown in FIGS. 4 to 6, and its upper end is connected to the lower part of the operating handle 2 via the first pin 8a. At the same time, its central portion is connected to a link mechanism via a second pin 8. Further, a push pin 2 is provided at the lower end of the push member 21.
2 is provided protrudingly, and the push pin 22 moves downward on the road XK in the same manner as the movement of the 1 link mechanism in the downward direction X on the road when the operating handle 2 is rotated, and when tripped,
As shown in FIG. 6, the trap is configured so that it can move in the lateral direction Y.

More specifically, when the operating handle 2 is rotated, the pushing member 21 also moves in the vertical direction X as the link mechanism moves in the vertical direction X, so the pushing pin 22 moves in the vertical direction X. Further, during the tripping operation, as shown in FIG. As the second pin 8 is lifted by the elastic force of the spring 16, the second pin 8 is displaced in the right lateral direction, and as the second pin 8 moves, it is displaced in the right lateral direction Y as shown in FIG. Therefore, the push pin 22 is moved in the direction X that intersects with the moving direction of the link mechanism only during the trip operation.
can be moved to.

On the other hand, a biasing lever 25 is pivotally supported by a fixed portion 26 provided near the signal contact 28 . The biasing lever 25 is
It is shaped like a letter ``■'', and its bent portion is connected to the fixing portion 26 with a pin, and is biased by a spring 29 to rotate clockwise. Further, at the upper end of the biasing lever 25, a hooking portion 25a for a switching lever 23, which will be described later, is provided.
is formed. The knee-rest release portion 25a is formed in the shape of a mountain at the upper end of the biasing lever 25 with the top pointing downward.

On the other hand, the switching lever 23 is rotatably attached to the fixed part 26. That is, the switching lever 23 opens and closes the switch button 28a of the signal contact 28, has an abbreviated shape, and its bent portion is attached to the fixed portion 26 by a pin 27. In the normal state, one end of the switching lever 28 has a hooking/unhooking portion 25a of the biasing lever 25.
A protruding roller 24 that can be engaged with is provided, and an extension portion 28a that can be pushed forward by the push pin 22 when the push pin 22 moves in the cross direction Y is formed.

The roller 24 normally engages with the inner slope of the latch portion 25a, so that the other end 28b of the switching lever 23 can be opened by pushing the switch button 28a of the signal contact 28 by the biasing force of the biasing lever 25. It has become. The extension portion 28a is formed to extend one end of the switching lever 23 to a position where the push pin 22 moves in the cross direction Y, and when the push pin 22 moves in the cross direction Y due to a trip operation, the push pin 22 moves in the cross direction Y. 22, it can be pushed clockwise around the pin 27 so as to resist the biasing force of the biasing lever 25 and disengage the disengagement portion 25a from the roller 24. There is. Therefore, when the extension part 23a at one end of the switching lever 23 is pushed forward, the other end part 23b becomes the switch button 28a of the signal contact 28.
It is a trap so that the person can be released and closed.

The operation of the small circuit breaker constructed as described above will now be described.

Now, when the main contact part A is in the closed state as shown in FIG. The other end of 5 hits one end 11a of the response member 11 of the link mechanism to connect the half-moon-shaped pin 10 and the first link 7.
Since the engagement with the engaging portion 7a is released, the movable base 12 and the second link 9 are rotated to open the main contact portion A by the elastic force of the spring 16, as shown in FIG.

At that time, the second link 9 of the link mechanism lifts up.
Therefore, since the second pin 8 is displaced in the right lateral direction, the pushing member 21 is also displaced as shown in FIG. The extension part 28a of the switching lever 23 is pressed into contact. As a result, the extension portion 28a is pushed clockwise by the push pin 22, and the roller 24 is moved toward the release portion 2 of the urging lever 25.
Move from the inner slope of 5a to the outer slope to hang and remove the part 25
Since the engagement between a and the roller 24 is released, the switching lever 2
When the other end 23b of the signal contact 28 releases the switch button 28a, the switch button 28a is closed.

In that case, the other end 23b of the switching lever 23 is located between the switch button 28a and the bulge 12a of the movable base 12.

On the other hand, in order to release the closed state of the switch button 28a, when an attempt is made to close the main contact portion A by rotating the operating handle 20, the movable base 12 is rotated, so that the bulging portion 12a is switched. Since the other end 28b of the lever 23 is pushed down, the roller 24 of the switching lever is engaged again with the hooking/disengaging portion 25aK of the urging lever 25, and the other end 28b of the lever 23 is pushed down.
3b can be opened by pressing the switch button 28a.

In this way, by using the pushing member 21, the urging lever 25, and the switching lever 23, even if it is small,
Since the signal contact 28 can be reliably operated during the trip operation, the alarm signal can be reliably emitted. Further, the extension portion 21a of the switching lever 28 and the pushing member 2
K is the push pin 22 of the push member 21 when the main contact portion A is opened and closed by the operation handle 2.
Since the switching lever 28 and the biasing lever 28 are separated from each other, the biasing lever 2
When the biasing force No. 5 does not act on the push pin 22 and the signal contact 28 is closed by the tripping operation, the biasing lever 25 and the switching lever 28 are no longer engaged, so the switching is not performed. The lever 28 and the push pin 22 are not subject to any force relationship with each other. Therefore, not only when the main contact part A is operated manually, but also when it is tripped, no load is applied between the switching lever 23 and the link mechanism, which prevents parts from wearing out. Each component can operate smoothly. Moreover, since the other end 28b of the switching lever does not come into contact with the movable base 12 when the main contact part A is closed, the contact pressure of the switching lever 23 is not affected by the switch button 28a, and the switching lever 2
8 and the signal contact 28 can be maintained uniformly.

7 to 9 show a second embodiment of a small circuit breaker with signal contacts according to the present invention. This embodiment differs from the first embodiment in that when the switch button 28a of the signal contact 28 is in the open state on the switching lever 23,
The point is that a spring member 80 is attached to allow the operation in the open state.

Now, when the switch button 28a is in the closed state due to the trip operation, by rotating the movable base 12 with the operating handle 2 to open the switch button 28a, the other end 28b of the switching lever 28 opens the switch button 28a. The pressing and opening process is as described above.

In that case, since the switch button 28a remains pushed in, it will overstroke, and a large pushing force will always act on it, so there will be little margin for movement when opening, and therefore it will not be possible to take pictures. There is a risk of damage when a shock occurs. As a solution to this problem, it is easy to think of increasing the spring force that holds the switch button 28a in order to give more leeway to the operation when the switch button 28a is opened. Switching lever 21. There is a possibility that the biasing lever 25 will be affected.

Therefore, in this embodiment, by utilizing the characteristics of the switch button 28a, a margin is provided for the operation of the switch button 28a. That is, when the switch button 28a is compared with the force P1 once pushed in and the return force P3 after being pushed in as shown in FIG. 9, the return force P of the switch button 28a is 14. Very small. Therefore, switch button 2
The return force of 8a is held by the spring member 30.

Therefore, the spring member 30 is made of a flat plate.
One end thereof is attached to the upper part of the other end 23b of the switching lever 23, and the other end forms a free end spaced apart from the switching lever 23. Then, when the movable base 12 is turned to open the switch button 28a, the bulging portion 12a presses the changeover switch 28 via the spring member 30, so that the switch button 28a is pushed by the pushing force P due to the movement of the movable base 12. t-
receive.

At that time, the point to pay attention to is that when the movable table 12 rotates, it moves slightly upward depending on the thickness of the wipe plate.
One end of the spring member 30 that is in contact with the bulge 12a of the movable base applies a load P to the other end so as to return the switch button 28a.
to act. Since the overstroke of the switch button 28a can be absorbed by the action of the load P, the opening operation of the switch button 28 can be made to that extent.

10 to 12 show an eighth embodiment of a small circuit breaker with signal contacts according to the present invention.

In this case, a switching spring 33 that opens and closes the switch button 28a is attached to the signal contact 28, and the tripping mechanism B
A pushing force for operating the switching spring 33 is rotatably attached to the connecting portion between the link mechanism and the movable table 12.

That is, the switching spring 83 has one end connected to the switch button 28.
The other end, which is biased in the direction of closing a, forms a raised portion 31a. On the other hand, the pusher 31 is attached to a third pin 17 that connects the second link 9 and the movable base 12. One end of the pushing rod 31 is formed with a contacting part 81a through which the engaging part 7a of the first link 7 can be pushed during the tripping operation, and the other end is capable of engaging with the protrusion 33a of the switching spring 38. It forms the colo atb.

The striking contact portion 131a is provided to protrude toward the engaging portion 7aK of the first link, and when the engagement between the engaging portion 7a and the half-moon pin 10 is released by a tripping operation, the engaging portion 7aK
In addition to the movement of a and the impact contact, K can be pushed clockwise around the third pin 17. Said roller 3
1b normally engages with the outer slope of the protrusion Baa of the switching spring 33, thereby acting as a trap so that the switching spring 33 opens the switch button 28a against its elastic force.

When the vibration part 31a is pushed forward by the tripping operation, the engagement of the switching spring with the protrusion 3aa is released, and the switching spring 83 uses its elastic force to move the switch button 28a and close it. It is designed to be completed. Therefore, as shown in FIG. 12, when the main contact portion A is opened and closed by the operation handle 2, the roller f
lllb is located at the position shown by the solid line and the chain line, and the force f1 of the switching spring 88 pushing the pushing member 31 moves from the fulcrum (third pin 17) to the right side so as to rotate the pushing member 31 counterclockwise. It is set. Further, during the tripping operation, the pushing member 31 rotates so that the roller 31b is located inside the projection 33a and escapes from the pushing force f.

Next, the operation of this embodiment will be described.

When the main contact part A is closed, when a trip is performed by the overcurrent detection device C, the engagement between the half-moon pin 10 and the first link 7 engaging part 7a is released by the rotation of the response member 11 of the link mechanism. Therefore, when the holding portion 7a vibrates the vibration portion 31a of the pushing member 31, the pushing force 1↑31 rotates clockwise. At this time, the engagement between the roller 31b of the pushing part 81 and the protrusion 33a of the switching spring 33 is released, so that the switching spring 33 uses its elasticity to push the switch button 2 of the signal contact 28.
8a can be released and closed. In that case, there is no force relationship between the pushing member 31 and the switching spring 38, and there is also no force relationship between the pushing member 31 and the link mechanism.

Therefore, in this embodiment, in addition to being able to obtain the same effects as in the first embodiment, the means for operating the signal contact 28 is composed of two parts, the push link 31 and the switching spring 33. Therefore, the number of parts and the number of assembly steps can be reduced accordingly.

〔Effect of the invention〕

Since the present invention has the above-described configuration, according to the first invention, even if it is small, the signal contact can be operated reliably only during the trip operation, and the main contact portion is connected to the operating handle. Not only when the device is opened and closed, but also when it is tripped, no load is applied to the tripping mechanism and the mechanism that operates the signal contact, which has the effect of smoothing the operation of each component.

Further, according to the second invention, in addition to the effect of the first invention, it is possible to provide a margin for the operation when the signal contact is opened, so that even if vibrations, shocks, etc. occur, they can be absorbed. This has the effect of increasing reliability by preventing the risk of malfunction. Furthermore, according to the third invention, in addition to the effect of the first invention, the number of component parts and the number of assembly steps of the mechanism for operating the signal contact can be reduced, and the cost can be reduced accordingly. There is.

[Brief explanation of the drawing]

FIG. 1 shows a first example of a small circuit breaker with signal contacts according to the present invention.
Fig. 2 is a front view showing the main contact when it is open, Fig. 3 is a front view showing the trip operation state, and Fig. 4 is a signal contact. FIG. 5 is a right side view of FIG. 4, FIG. 6 is an explanatory front view showing the closed state of the signal contact, and FIG. 7 is a small model with a signal contact according to the present invention. A front view of the main parts showing the second embodiment of the circuit breaker, FIG. 8 is a front view of the main parts showing the relationship between the movable base and the spring member, and FIG. 9 is an explanation showing the characteristics of the switch button of the signal contact. 10 are sectional views of main parts showing a third embodiment of a small circuit breaker with signal contacts according to the present invention, and FIG.
FIG. 1 is a front view of the main parts showing the tripping operation state, and FIG. 12 is an explanatory diagram showing the relationship between the push link and the switching spring. A... Main contact portion, 12... Movable base, 13... Movable contact, 15... Fixed contact, B... Tripping mechanism, 2...
...Operation handle, 7...1st link, 9...2nd link
Link, 10...Half-moon pin, 11...Response member, 3.8a, L L? ... Zen, C... Overcurrent detection device, 5... Movable iron piece, 19... Coil, 20...
- Fixed iron core, 28... Signal contact, 28a... Switch button, 21... Pushing member, 22... Pushing pin, 23
...Switching 1/bar, 2aa...g length M, 24...
- Roller, 25...Biasing lever, 25a...Latching/unloading part, 26...Fixing part, 30...Spring member, 81...
・Pushing motion, 31a... Swinging part, 3117...:yo,
88...Switching spring, 33a...Protrusion. 30th I4 Eyes (ha 弗 10 ward 叉2B 茅 12 fig.

Claims (1)

[Scope of Claims] 1. A link mechanism in which a fixed contact and a movable contact provided on a movable base form a main contact portion, and an operating handle and a link mechanism connected at one end to the operating handle and connected at the other end to the movable base. The tripping mechanism having the above opens and closes the main contact part, and the overcurrent detection device opens the main contact part through the link mechanism and the movable base when the overcurrent trips, and generates an alarm signal when the overcurrent trips. In a small circuit breaker with a signal contact that is provided with a signal contact that emits a signal, the operating handle and the link mechanism are moved in a substantially straight direction when the operating handle is rotated, and when the overcurrent detection device is tripped, the A pushing member having a pushing pin that can be moved in a direction intersecting the linear direction is connected, and the fixed part next to the signal contact has a hooking and unlatching part for a switching lever, and the pushing member is rotatable in the direction of the signal contact. A roller that pivotally supports the biasing lever and that can engage with a locking/disengaging portion of the biasing lever, and a roller that pushes the push pin only when the push pin moves during the trip operation. and a switching lever is attached so as to be rotatable in a direction to open a switch button of a signal contact when the extension part is pushed forward by a push pin. A small circuit breaker with a signal contact 2, a main contact part is formed by a fixed contact and a movable contact provided on a movable base, and an operation handle and a link connected at one end to this and connected at the other end to the movable base. The main contact section is opened and closed by the tripping mechanism having a mechanism, and the overcurrent detection device opens the main contact section through the link mechanism and the movable base when an overcurrent trip operation occurs, and an alarm is generated when the overcurrent trip operation occurs. In a small circuit breaker with a signal contact that is provided with a signal contact that emits a signal, the operating handle and the link mechanism are configured to move in a substantially straight direction when the operating handle is rotated, and when the overcurrent detection device is tripped. A pushing member having a pushing pin that can be moved in a direction intersecting the linear direction is connected, and the fixed part on the signal contact side has a hooking/unhooking part for a switching lever and is rotatable in the direction of the signal contact. The biasing lever is pivotally supported, and a roller is capable of engaging with a locking/disengaging portion of the biasing lever, and the push pin can be pushed only when the push pin moves during the tripping operation. an extension part, and a switching lever is mounted so as to be rotatable in a direction to open a switch button of a signal contact when the extension part is pushed forward by a push pin, and the switching lever and the movable base are connected to each other. A small circuit interrupter with a signal contact, characterized in that a spring member is attached to either one of the switch levers to allow the switch button to operate in the open state when the switch lever opens the switch button. vessel. 3. A tripping mechanism in which a fixed contact and a movable contact provided on a movable base form a main contact portion, and has an operating handle and a link mechanism connected at one end to the operating handle and connected at the other end to the movable base. A signal contact is provided which opens and closes the main contact part by means of the overcurrent detection device, opens the main contact part through the link mechanism and the movable table when an overcurrent trip operation is performed by the overcurrent detection device, and emits an alarm signal when the overcurrent trip operation occurs. In the small circuit breaker with a signal contact, a switching spring is attached to the signal contact, and the switching spring has one end that extends to the switch button, and the one end is biased in a direction to close the switch button, and the link a contact portion in which a part of the link mechanism can be pushed during the tripping operation, at a connecting portion between the mechanism and the movable contact;
A driving punch bar having a roller capable of engaging with one end of the switching spring is provided, and when the projection is pushed forward by a part of the link mechanism, the switching spring presses the switch button. A small circuit breaker with a signal contact, characterized in that it is rotatably mounted to close.