JP2950486B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in workability and breaking performance of a link mechanism of a so-called slow-insertion type circuit breaker and to a reduction in cost.

[0002]

2. Description of the Related Art Conventionally, the mechanism of a circuit breaker of this type is as shown in FIGS.

In FIG. 1, reference numeral 1 denotes a handle shaft fixed to a frame (not shown), 2 denotes a handle rotatably supported by the handle shaft 1, and 3 denotes an ON side integrally with the handle 2 about the handle shaft 1. , A first link that turns to the OFF side, and is formed integrally with the handle 2 in this example.

[0005] Reference numeral 5 denotes a second link. In this embodiment, the second link is bent in a U-shape as shown in FIG. 3, and one end has a shaft portion 6 and the other end has a shaft portion 7. However, as shown in FIG. 8, the shafts 6 'and 7' and the link portion 5 'may be formed as optional items.

The shaft 6 at one end of the second link 5 is rotatably supported by the shaft hole 4 at the end on the rotating side of the first link 3, and the shaft 7 at the other end is a holding plate. The shaft is supported by 16 shaft holes 14 and is slidably combined with a slide groove 8 provided on a frame (not shown) in a direction far from the handle shaft 1.

[0006] Here, the frame is a generic term for a non-movable body in which the bearing 28 and the body 29 are combined as shown in FIG. 9. The handle shaft, the slide groove, the guide groove and the like are any of the bearing and the body. May be formed.

Reference numeral 9 denotes an engagement step portion 1 with one end 13 of the holding plate 16.
2 is a tripping rod which rotates in the direction of disengaging the above-mentioned engagement about the shaft 11 by the urging of an abnormality detecting element such as the overcurrent detecting bimetal 10 or the like.

Reference numeral 16 denotes a holding plate. One end 13 is engaged with the engaging step of the tripping rod 9 as described above, and the shaft hole 14 and the holding portion 15 of the cross bar 17 are provided at the other end. Have.
In the drawing, the shaft hole 14 and the holding portion 15 are arranged in this order from the one end 13, but the holding portion 15 and the shaft hole 14 may be arranged in this order.

The crossbar 17 is mounted between the movable contact plate 19 and the holding portion 15 of the holding plate 16 so as to be movable in a guide groove 26 provided in the frame. With the rotation of the link, the movable contact plate 19 is pressed against the spring 18 which constantly biases the movable contact plate 19 in the direction in which the contacts 20 and 21 are separated by the pressing plate in the direction in which the contacts 20 and 21 are closed. The pressing portion 15 of the holding plate 16 is lifted and urged by the reaction force, and the shaft hole 14 of the holding plate is lifted and urged in a lever-like manner with the engaging step 12 of the release rod 9 as a fulcrum. Of the handle shaft 1 from the far side to the near side along the slide groove 8 to be urged.

Reference numeral 23 denotes a handle spring for hanging one end of a free end on a spring hook portion 24 provided on the frame, and the other end for biasing the handle 2 to rotate counterclockwise in the drawing.

In the mechanism constructed as described above, FIG. 4 shows a state in which the contacts 20 and 21 are completely shifted from the handle OFF contact opening to the handle ON and contact closing side by operating the handle. It shows the very moment of contact.

When the handle 2 is released from the state shown in FIG. 4, the handle 2 rotates counterclockwise by the biasing force of the handle spring 23, and the contacts 20, 2 are biased by the biasing force of the spring 18.
When the handle 1 is opened, the handle shaft 1 and the shaft portion 7 of the second link 5 approach each other, and the OFF state is stabilized.

Next, the handle 2 is turned on from the state shown in FIG.
When the pivoting operation is performed on the side, that is, in the clockwise direction in the figure, the connecting portion 6 of the first link 3 and the second link 5 approaches the line connecting the handle shaft 1 and the shaft portion 7, that is, approaches the dead center. The portion 7 is pushed down along the slide groove 8, and the engagement portions 12 and 13
With the fulcrum as a fulcrum, the holding plate 16 is further pushed down leverage, and the crossbar 17 is pushed down further.
Since 0 and 21 are in contact with each other, the amount of excessive movement of the crossbar 17 downward from FIG. 4 is absorbed by the movable contact plate 19 being bent.

Further, the handle 2 rotates clockwise in the figure,
When the connecting portion 6 of the first link 3 and the second link 5 exceeds a dead point formed by a line segment connecting the handle shaft 1 and the shaft 7, the shaft 7 is now subjected to an upward reaction force received by the crossbar 17. By the bias, it is biased toward the handle shaft 1 closer,
The first link 3 and the second link 5 are likely to bend greatly in an inverted letter shape as shown in FIG. 4, and the connecting portion 6 is going to move further to the left in the figure. The fifth
The movement is restricted by the restricting portion 27 shown in the figure, and is kept ON in the state shown in FIG. In this example, the regulating portion 27 regulates the shaft portion 6, but may regulate the rotation of the handle 2 and the first link 3.

In the state shown in FIG. 5, if the tripping rod 9 rotates counterclockwise in FIG. 5 around the eleventh due to an overcurrent or the like, the engagement between the levers 12 and 13 is released and the lever is not restricted by the holding plate. The pressing plate 16 is rotated about the shaft 7 in the counterclockwise direction in the figure, the crossbar 17 is released from the downward pressing restriction, the contacts 20 and 21 are separated by the spring 18, and the handle 2 is The spring 23 rotates counterclockwise in FIG.

[0016]

2. Description of the Related Art In the circuit breaker of the so-called slow-insertion type as described above, the horizontal width W of the slide groove 8 of the frame in the figure as shown in FIG. Since the portions 28 and 29 are cut and bulged due to burrs and deformation, the link 5 is inserted due to the insertion of the portions into the grooves.
Yes Allow extra of W ₂ with respect to the diameter W ₁ of the shaft portion, the W ₂ in some cases zero. A few millimeters are required.

The engagement step 12 in the state shown in FIG.
As shown in FIG. 6, the function of the state shown in FIG.
It is the slide groove 8 and the shaft 7 that can move to the left and right in the figure on the top of FIG. 7 and regulate the movement in that direction. The spring 18 tries to lift the holding plate 16 and the handle is turned to the ON side, that is, the first When the user tries to rotate the link 3 clockwise about the handle shaft, the shaft portion 7 of the second link 5 is rotated.
Is pushed all the way to the left in the figure with respect to the width W of the slide groove 8, so that the engagement amount k between the engagement step portion 12 and the one end 13 becomes relatively deep.

Next, the amount of engagement between the engaging step portion 12 and the one end 13 in the state of FIG. 5 is determined by the function schematic diagram of FIG. The connecting portion 6 of the link 3 and the second link 5 exceeds the dead center consisting of a line segment connecting the handle shaft 1 and the shaft portion 7 to the left of the drawing, and the first link 3 moves in the clockwise direction. from being restricted by the restriction portion 27 of the rotation, the shaft 7 is pushed all the way to the right in the width direction of the figure the slide groove 8, thus position by W ₂ to the left of the comparison shaft 7 has the case of FIG. 6 It will shift.

The presser plate 16 in accordance with positional displacement of the shaft portion 7 even shifted by W ₂ to the right in the figure, the engaging amount is reduced by W2 from k of Figure 6, typically 0. From several mm to at most 1 mm.

In the circuit breaker according to the present invention, when the abnormal state mechanism operates to close the contact and open the circuit to cut off the circuit, the circuit breaker is completely turned on from the state shown in FIG. The so-called O-interruption, which is performed when an abnormality occurs in the circuit on the load side of the circuit breaker, and when the cause of the abnormality has already occurred in the circuit on the load side of the circuit breaker, the circuit breaker is turned off in that state. There are two types of so-called CO cutoff which is performed when the switch is turned on from ON, that is, when the switch is turned on from the state shown in FIG.

However, in the above-mentioned two types of cut-off states, in the case of the conventional example, the tripping rod 9 and the holding plate 16 are provided as described above.
If there is a difference in the amount of engagement between the two, it is very inconvenient in the case of CO cutoff as described below.

That is, C is smaller than the engagement amount in the case of O interruption.
Since the amount of engagement in the case of O cutoff is large, in the case of CO cutoff,
The time from when the abnormality detection element begins to pull the release rod to rotate and urge it to disengage is required longer than when the O is shut off, and it takes a longer time from the detection of an abnormality until the contact starts to open. As a result, the blocking performance is worse than that of O blocking. The amount of engagement in the case of O interruption is 0. Several mm to 1 mm
On the other hand, in the case of CO cut-off, an additional 0. The effect is significant because it is several mm longer.

In order to solve the above problem, it is necessary to make the width of the slide groove 8 as small as possible with respect to the diameter of the shaft portion 7. It is also desirable that the diameter of the shaft hole 14 of the holding plate be made as small as possible with respect to the diameter of the shaft 7.

However, the cutting part of the shaft part 7 is the same as that of the third part.
As shown in the figure, the cross section is usually protruded or deformed, and it must be at least a dimension through which the cut portion passes.
Alternatively, after adding a step of shaping the cut portion of the shaft portion 7 by barrel polishing or the like and increasing the cost, the width of the groove is reduced to the last.

In order to improve assembling workability such as automatic assembling, it is desirable that the width is as large as possible, which is inconsistent with the above-mentioned problem of the breaking performance.

[0026]

SUMMARY OF THE INVENTION Therefore, the present invention provides a circuit breaker that has good breaking performance, good assembly workability, and low cost in any case where the amount of engagement of the engaging portion does not change between O blocking and CO blocking. It is intended to be.

[0027]

Therefore, in the present invention, the slide groove of the frame and the shaft hole of the holding plate have a two-stage structure of a wide shaft insertion portion and a widening function portion.

[0028]

[Function] During assembly, insert the shaft from the wide part with good workability.
At the time of functioning, it functions in the width portion and the amount of engagement does not change, so that the performance does not change by O cutoff and CO cutoff. Also, the shaft portion does not require an additional step such as barrel polishing, so that the cost can be reduced accordingly.

[0029]

1 and 2 show an embodiment of the present invention. Reference numeral 100 denotes a slide groove used in the present invention corresponding to the slide groove 8 in FIGS. 4 to 7, and FIG. 1 is a view corresponding to FIG. Are turned from OFF to ON, and the contacts 20, 2
1 is in the position just touched.

The slide groove 100 includes the position of the shaft portion 7 shown in FIG. 1, and below the position, the width of the width W 'is reduced to almost the same as the shaft diameter.
02, and a width of 10 above the position of the shaft 7
2 has a wide portion 101 having a width W ″ sufficient for the shaft diameter in consideration of deformation of the cut portion, burrs, and ease of assembly.

In order to make the present invention function even more well, as shown in FIGS. 2A and 2B, the shaft hole 200 of the holding plate 16 is widened by about W ″ similarly to the above-mentioned wide portion 101. It is good to form a hole, and to form a lower part like V-shaped part 201 and width | variety part 201 '.

When assembling the circuit breaker constructed as described above, after assembling the handle 2, the first link 3, the handle spring 23 and the like on the handle shaft 1, the handle 2 is moved counterclockwise from FIG. When it is near the rotated OFF position,
The shaft 6 of the second link 5 is inserted into the hole 4 of the first link 3, the shaft 7 is inserted into the wide portion 101 of the slide groove 100, and simultaneously penetrates the shaft hole 200 of the holding plate 16.

At this time, since the holes into which the shaft portion 7 is inserted are the wide portion 101 and the wide shaft hole 200 as described above, the workability is very good, and the handle shaft 1 has the handle 2 and the first link 3. Can be easily inserted after assembling.

When the handle is turned to the ON side, that is, clockwise in the drawing, from the handle OFF state assembled as described above, the shaft portion 7 is widened from the wide portion 101 of the slide groove via the introduction portion 103. As it descends to the portion 102, the end portion 13 to the holding plate 16 and the engaging step portion 12 engage,
The holding portion 15 contacts the crossbar 17, the shaft portion 7 is guided and abuts on the V-shaped portion 201, and the shaft portion 7 starts pushing the V-shaped portion 201 downward.

Thereafter, the shaft portion 7 comes into contact with the V-shaped portion 201, and the contacts 20, 21 are closed in a state where the shaft portion 7 has completely entered the width portion 102 of the slide groove 100, and the handle is further rotated in the ON direction. While the shaft portion 7 is in contact with the V-shaped portion 201, the width portion 102 in the slide groove 100 is moved downward, and the shaft portion 6 is formed by a line segment connecting the handle shaft 1 and the shaft portion 7. The point O
Hold N.

At this time, by operating the handle 2 to the ON side, the contacts 20 and 21 come into contact, and the shaft 7 continues to contact the V-shaped portion 201 of the holding plate 16 until it is completely turned on. 4 and 5, the change in the amount of engagement between the engagement step 12 and the one end 13 at the time of O interruption and at the time of CO interruption as in the conventional example of FIG. 4 and FIG. It is small and does not change the blocking performance.

[0037]

[Effect] According to the present invention, it is easy to assemble as abnormal,
In addition, the interruption performance does not change in any of the O interruption and the CO interruption, and a low-cost circuit breaker can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram of a mechanism of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is a diagram of a holding plate of the embodiment of the circuit breaker of the present invention.

FIG. 3 shows an example of a second link used in the present invention.

FIG. 4 is a diagram of a mechanism of a conventional circuit breaker.

[Fig. 5]

FIG. 6 is a functional diagram of FIG. 4;

FIG. 7 is a functional diagram of FIG.

FIG. 8 is an example diagram of another second link.

[Fig. 9] Fig. 9 shows an example of a frame 2 Handle 23 Handle spring 3 First link 100 Sliding groove 5 Second link 101 Wide section 9 Stripping rod 102 Width section 16 Holding plate 200 Shaft hole 17 Cross bar 201 V Shaped 20, 21 contacts

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Furumoto 3-142 Oshu, Minami-ku, Hiroshima City Inside Templar Industries Co., Ltd. (72) Inventor Kazuto Takami 3-42 Oshu, Minami-ku, Hiroshima City Shinichi Nakagawa, Examiner at No. Templar Industry Co., Ltd. (56) References JP-A-57-134834 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 71/12

Claims (2)

(57) [Claims] 1. A handle shaft fixed to a frame, a first link that rotates integrally with the handle toward the ON or OFF side about the handle shaft, one end of which is provided at a rotation end side of the first link. A second link that is supported, the other end of which is pivotally supported by the holding plate, and the shaft portion of the other end slides in a slide yard provided on the frame in a distance direction with respect to the handle shaft; A tripping rod which is urged to trip the engaging portion due to an abnormality in the circuit, one end of which is engaged with the engaging portion of the tripping rod, and the other end of which has the second end.
A shaft hole supporting the link of the second link, and a pressing portion of a crossbar which is always elastically urged in the contact opening direction in conjunction with the movable contact. A pressing plate that constantly biases the end portion in a direction close to the handle shaft; a handle spring that constantly biases the handle in the OFF direction; and a rotation restricting portion provided on a frame; And the second link and the elastic biasing force for compressing between the non-connection-side ends of the links form an over-center toggle link mechanism with a dead point at a line connecting the non-connection-side ends. When the handle is rotated from the OFF side to the ON direction, the first contact point of the link between the first link and the second link closes before the dead center of the over-center toggle link mechanism. 1 is reached, then the connection exceeds the dead point ,
A circuit breaker that is kept ON in the second state in which the rotation of the first link is restricted by the restriction unit provided on the frame. The slide groove has a width from the position where the shaft portion on the holding plate side of the second link is in the first state to a position substantially equal to the diameter of the shaft portion on the side farther from the handle shaft including that position. A circuit breaker characterized in that it has a two-stage width shape in which a width is made smaller and a side closer to the handle shaft is wider than that. 2. The shaft hole of the holding plate is made as large as the wide portion of the slide groove, and the side of the shaft hole farther from the handle shaft is
The circuit breaker according to claim 1, wherein the circuit breaker is a V-shaped portion or a width portion. [0001]