JP2019204701A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker in which a coil spring for pressing a movable contact can be easily arranged on a movable body.SOLUTION: A circuit breaker 10 includes a handle 70, a separator 60, and a coil spring 80. The separator 60 operates in conjunction with the operation of the handle 70, and a cylindrical insertion portion 63 into which a movable contact 50 is inserted is formed. The coil spring 80 presses the movable contact 50 against an upper inner wall surface 631 of the insertion portion 63. The insertion portion 63 is formed with an insertion opening 636 into which the coil spring 80 can be inserted. A protrusion 55 into which the coil spring 80 is inserted is formed on the pressing surface 54 of the movable contact 50 pressed by one end of the coil spring 80. An inclined surface 550 is formed on the protrusion 55.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to circuit breakers.

  Conventionally, there is a circuit breaker described in Patent Document 1 below. The circuit breaker described in Patent Document 1 includes a movable body that operates in conjunction with the operation of the handle, and a movable contact that has a movable contact opposite to the fixed contact at one end. The other end of the movable contact is pivotally supported by a pivotal support. A coil spring is arranged in a compressed state between the movable body and the movable contact. One end of the coil spring is inserted into a protrusion provided at the tip of the movable body. Thereby, the coil spring is prevented from coming off from the movable body.

Japanese Patent Laid-Open No. 2-144817

  By the way, in the circuit breaker described in Patent Document 1, when the coil spring is disposed between the movable body and the movable contact, the coil spring is compressed in advance, and then between the movable body and the movable contact. A coil spring is inserted into the. At that time, it is necessary to compress the coil spring in advance so that the total length of the coil spring becomes shorter than the length of the gap between the protrusion of the movable body and the movable contact. When the gap between the movable body and the protrusion of the movable contact is narrow, it is very difficult to insert a compressed coil spring between them.

  The present disclosure has been made in view of such circumstances, and an object thereof is to provide a circuit breaker capable of easily arranging a coil spring for pressing a movable contact on a movable body. .

  A circuit breaker that solves the above problem is a circuit breaker capable of connecting and disconnecting an electric circuit between a power supply side terminal and a load side terminal by contacting and separating a fixed contact and a movable contact. , A handle, a movable body, and a coil spring. The handle is operated when connecting and disconnecting the electric circuit. The movable body operates in conjunction with the operation of the handle, and a cylindrical insertion portion into which the movable contact is inserted is formed. The coil spring is disposed in the insertion portion and presses the movable contact against the inner wall surface of the insertion portion. The insertion portion is formed with an insertion opening into which a coil spring can be inserted. A protruding portion into which the coil spring is inserted is formed on one of the pressing surface of the movable contact pressed by one end portion of the coil spring and the inner wall surface of the insertion portion with which the other end portion of the coil spring abuts. . An inclined surface that is inclined with respect to the pressing surface is formed at a portion of the protruding portion that faces the insertion opening so that the height of the protruding portion decreases as the insertion opening of the insertion portion approaches.

  According to this structure, when a coil spring is inserted in an insertion part from an insertion opening part, a coil spring contacts the inclined surface of a protrusion part. When the coil spring is pushed into the insertion portion in this state, the coil spring is naturally compressed while sliding on the inclined surface of the protrusion. And if a coil spring is further pushed in, a coil spring will be inserted in a protrusion part. Therefore, it is only necessary to perform the work of compressing the coil spring so that it can be inserted into the insertion portion, and it is not necessary to perform the work of further compressing the coil spring for insertion into the protruding portion. Therefore, a coil spring for pressing the movable contact can be easily arranged on the movable body.

In the above circuit breaker, it is preferable that an orthogonal surface orthogonal to the pressing surface is formed on a portion of the protruding portion opposite to the inclined surface.
According to this configuration, when the coil spring is displaced in the direction of the insertion opening, the inner peripheral surface of the coil spring comes into contact with the orthogonal surface of the protruding portion, so that the coil spring is difficult to be removed from the insertion portion. The movable contact is also difficult to remove from the insertion portion.

In the above circuit breaker, a step portion that is orthogonal to the pressing surface is formed at a portion of the protruding portion that faces the insertion opening of the insertion portion, and an inclined surface is formed continuously from the step portion. Preferably it is.
According to this configuration, after the protrusion is inserted into the coil spring, when the coil spring is further pushed in, the inner peripheral surface of the coil spring comes into contact with the stepped portion, thereby suppressing excessive pushing of the coil spring. Can do.

In the above circuit breaker, it is preferable that a flat surface parallel to the pressing surface is formed at the tip of the protrusion.
When the coil spring is pushed into the insertion portion of the movable body, the protrusion and the coil spring interfere with each other. Therefore, if the tip of the protrusion is sharp, the tip of the protrusion is likely to be lost when the tip of the protrusion interferes with the coil spring. If the tip of the protruding portion is lost, the height of the protruding portion is substantially reduced, and there is a concern that the coil spring can easily come out of the protruding portion. In this regard, if a flat surface is formed at the tip of the protruding portion as in the above-described configuration, the protruding portion is difficult to be lost, and therefore, it is difficult to cause a concern that the coil spring is easily detached from the protruding portion.

In the above circuit breaker, when the projecting portion is the first projecting portion, a second projecting portion into which the coil spring is inserted is formed on either the pressing surface of the movable contactor or the inner wall surface of the inserting portion. It is preferable that
According to this configuration, since the second protrusion is further inserted into one end or the other end of the coil spring, the coil spring is prevented from coming off from the both ends of the coil spring. It becomes difficult to come off.

In the above circuit breaker, it is preferable that a groove portion into which the coil spring is inserted is formed on either the pressing surface of the movable contactor or the inner wall surface of the insertion portion.
According to this structure, since one end part or the other end part of the coil spring is further inserted into the groove part, the coil spring is prevented from coming off from the both end parts of the coil spring. .

  According to the present disclosure, it is possible to provide a circuit breaker in which a coil spring for pressing the movable contact can be easily arranged on the movable body.

FIG. 1 is a cross-sectional view showing a partial cross-sectional structure of the circuit breaker according to the first embodiment. FIG. 2 is a side view showing a side structure of the separator and the movable contact according to the first embodiment. FIG. 3 is a cross-sectional view showing a cross-sectional structure of the separator according to the first embodiment. FIG. 4 is a cross-sectional view showing a part of a method for assembling the movable contact to the separator according to the first embodiment. FIG. 5 is a cross-sectional view showing a part of the method for assembling the movable contact to the separator of the first embodiment. FIG. 6 is a cross-sectional view showing a cross-sectional structure of a separator of a reference example. FIG. 7 is a cross-sectional view showing a cross-sectional structure of a separator according to a modification of the first embodiment. FIG. 8 is a cross-sectional view showing an enlarged cross-sectional structure around the protrusion of the separator according to the second embodiment. FIG. 9 is a cross-sectional view showing an enlarged cross-sectional structure around the protrusion of the separator according to the third embodiment. FIG. 10 is a cross-sectional view showing a cross-sectional structure of the separator according to the fourth embodiment. FIG. 11 is a cross-sectional view showing a cross-sectional structure of a separator according to a modification of the fourth embodiment.

Hereinafter, an embodiment of a circuit breaker will be described with reference to the drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.
<First Embodiment>
First, the circuit breaker 10 of 1st Embodiment shown by FIG. 1 is demonstrated. As shown in FIG. 1, the circuit breaker 10 according to the present embodiment includes a power supply side terminal 31 provided so as to be exposed to the outside at the left side wall portion 201 of the housing 20 and an external side at the right side wall portion 202 of the housing 20. And a load side terminal 41 provided so as to be exposed. A power supply side wiring is connected to the power supply side terminal 31. Load side wiring is connected to the load side terminal 41. The circuit breaker 10 switches between a state in which the power supply side terminal 31 and the load side terminal 41 are electrically connected and a state in which the connection is cut off, whereby the power supply side wiring and the load side wiring are It is a device capable of switching the electrical connection state.

  The circuit breaker 10 includes a fixed contact 30 provided with a power supply side terminal 31 at one end, a load side terminal fitting 40 provided with a load side terminal 41 at one end, and a movable contact 50 provided inside the housing 20. And a separator 60 to which the movable contact 50 is fixed, and a handle 70 provided so as to protrude from the upper surface 203 of the housing 20. In the present embodiment, the separator 60 corresponds to a movable body.

  The stationary contact 30 is made of a flat metal member having conductivity. The fixed contact 30 is disposed so as to extend from the power supply side terminal 31 to the inside of the housing 20, and is fixed to the housing 20. A fixed contact 32 that is disposed so as to face the movable contact 52 of the movable contact 50 is provided at one end of the fixed contact 30 that extends into the housing 20.

  The separator 60 is made of an insulating material such as resin. Specifically, as shown in FIG. 2, the separator 60 is formed in a substantially cylindrical shape with the axis m1 as the center. A cylindrical shaft portion 62 is formed at one end portion 61 of the separator 60 in the direction along the axis m1. In addition, although illustration is abbreviate | omitted, the cylindrical axial part 62 is similarly formed in the other end part of the separator 60 in the direction along the axis line m1. By inserting these shaft portions 62 into predetermined insertion portions of the housing 20, the separator 60 is supported by the housing 20 so as to be rotatable about the axis m1. The separator 60 is connected to the handle 70 via a link mechanism (not shown), and rotates about the axis m1 in conjunction with the operation of the handle 70.

  As shown in FIG. 3, the separator 60 is formed with a rectangular tubular insertion portion 63 into which the movable contact 50 is inserted. The insertion portion 63 is formed so as to extend in a direction orthogonal to the axis m1, that is, in the radial direction of the separator 60. The movable contact 50 is in contact with the upper inner wall surface 631 of the insertion portion 63. A coil spring 80 is disposed in a compressed state between the movable contact 50 and the lower inner wall surface 632 of the insertion portion 63. The movable contact 50 is pressed against the upper inner wall surface 631 of the insertion portion 63 by the elastic force of the coil spring 80. The movable contact 50 is electrically connected to the load side terminal fitting 40 shown in FIG. In the present embodiment, the upper inner wall surface 631 of the insertion portion 63 corresponds to the first inner wall surface, and the lower inner wall surface 632 of the insertion portion 63 corresponds to the second inner wall surface.

  As shown in FIG. 3, the movable contact 50 is made of a flat metal member having conductivity. The distal end portion 51 of the movable contact 50 is disposed so as to protrude from one opening 634 of the insertion portion 63 of the separator 60. A movable contact 52 is provided at the tip of the movable contact 50. Engaging portions 53 are formed so as to protrude from both side surfaces of the movable contact 50 that is inserted into the insertion portion 63 of the separator 60 and is positioned in the direction along the axis m1. The engaging portion 53 is engaged with an engaging groove 633 formed on the side inner wall surface 630 of the insertion portion 63 of the separator 60. The movable contact 50 is fixed to the separator 60 by the engagement structure between the engagement portion 53 and the engagement groove 633 and the pressing force applied from the coil spring 80.

  A step 635 is formed in the opening 634 of the insertion portion 63 so as to protrude from the lower inner wall surface 632 toward the upper inner wall surface 631. When the coil spring 80 inserted into the insertion portion 63 is displaced toward the opening 634 of the insertion portion 63, the coil spring 80 comes into contact with the step portion 635, thereby preventing the coil spring 80 from coming off from the insertion portion 63. Is made.

An insertion opening 636 into which the coil spring 80 can be inserted is formed inside the insertion portion 63 at a portion of the insertion portion 63 opposite to the opening 634. That is, the coil spring 80 is inserted into the insertion portion 63 from the insertion opening 636.
A protrusion 55 is formed on the pressing surface 54 of the movable contact 50 that is pressed by the one end 81 of the coil spring 80. One end 81 of a coil spring 80 is inserted into the protruding portion 55. An inclined surface 550 is formed at a portion of the protruding portion 55 that faces the insertion opening 636 of the insertion portion 63. The inclined surface 550 is formed so as to be inclined with respect to the pressing surface 54 so that the height of the protruding portion 55 becomes lower as it approaches the insertion opening 636 of the insertion portion 63. An orthogonal surface 551 that is orthogonal to the pressing surface 54 is formed on a portion of the protruding portion 55 opposite to the inclined surface 550.

  In the circuit breaker 10 of the present embodiment, when the handle 70 is operated to the position shown in FIG. 1, the separator 60 is held at the position shown in FIG. That is, since the movable contact 52 is separated from the fixed contact 32, the electrical connection between the power supply side terminal 31 and the load side terminal 41 is cut off. In this state, when the handle 70 is operated in the direction indicated by the arrow a1, the separator 60 rotates about the axis m1 in the direction indicated by the arrow b1. Thus, when the movable contact 52 comes into contact with the fixed contact 32, the power supply side terminal 31 and the load side terminal 41 are electrically connected. At this time, the coil spring 80 functions as a contact pressure spring for maintaining an electrical connection state between the movable contact 52 and the fixed contact 32. That is, when the movable contact 52 and the fixed contact 32 are in contact with each other, the elastic force of the coil spring 80 is applied to the movable contact 52 via the movable contact 50, so that the movable contact 52 and the fixed contact 32 are connected. It is held in contact with a predetermined pressure.

  When the handle 70 operated in the direction indicated by the arrow a1 is operated in the direction indicated by the arrow a2, the separator 60 rotates about the axis m1 in the direction indicated by the arrow b2. As a result, the movable contact 52 is separated from the fixed contact 32 and the electrical connection between the power supply side terminal 31 and the load side terminal 41 is cut off. As described above, in the circuit breaker 10, the fixed contact 30 and the movable contact 50 are brought into contact with and separated from each other based on the operation of the handle 70, thereby connecting the electric circuit between the power supply side terminal 31 and the load side terminal 41. And can be blocked.

Next, a method for fixing the movable contact 50 to the separator 60 will be specifically described.
As shown in FIG. 4, when the movable contact 50 is fixed to the separator 60, first, the movable contact 50 is inserted from the opening 634 of the separator 60 in the direction indicated by the arrow c, and then the movable contact 50 is moved. The engaging portion 53 of the child 50 is engaged with the engaging groove 633 of the separator 60. Thereafter, as shown in FIG. 5, the coil spring 80 is inserted in the direction indicated by the arrow d while being compressed from the insertion opening 636 of the separator 60 into the insertion portion 63. At this time, when the coil spring 80 is pushed toward the protruding portion 55 of the movable contact 50, the coil spring 80 is naturally compressed while sliding on the inclined surface 550 of the protruding portion 55. When the coil spring 80 is further pushed in, the protruding portion 55 is inserted into the one end portion 81 of the coil spring 80, as shown in FIG. Thereby, fixation of the movable contact 50 with respect to the separator 60 is completed.

According to the circuit breaker 10 of this embodiment demonstrated above, the effect | action and effect shown by the following (1) and (2) can be acquired.
(1) For example, as shown in FIG. 6, when the projecting portion 55 is not formed with the inclined surface 550, in order to insert the one end portion 81 of the coil spring 80 into the projecting portion 55, it is inserted into the inserting portion 63. In addition to the operation of compressing the coil spring 80 so that it can be performed, it is necessary to further compress the coil spring 80 in order to insert the one end 81 of the coil spring 80 into the protruding portion 55. In this regard, in the circuit breaker 10 of the present embodiment, when the one end portion 81 of the coil spring 80 is inserted into the protruding portion 55, the coil spring 80 is compressed so that it can be inserted into the insertion portion 63. Therefore, the coil spring 80 for pressing the movable contact 50 can be easily disposed on the separator 60.

  (2) An orthogonal surface 551 orthogonal to the pressing surface 54 of the movable contact 50 is formed on the surface of the protruding portion 55 opposite to the inclined surface 550. As a result, when the coil spring 80 is displaced in the direction of the insertion opening 636, the inner peripheral surface of the coil spring 80 contacts the orthogonal surface 551 of the protruding portion 55, so that the coil spring 80 is inserted into the insertion portion 63 of the separator 60. The movable contact 50 is also difficult to be removed from the insertion portion 63.

(Modification)
Next, the modification of the circuit breaker 10 of 1st Embodiment is demonstrated.
As shown in FIG. 7, in the circuit breaker 10 of this modification, the protruding portion 55 is formed on the lower inner wall surface 632 of the separator 60 instead of the pressing surface 54 of the movable contact 50. The lower inner wall surface 632 is a portion where the other end portion of the coil spring 80 contacts the separator 60. The protruding portion 55 is inserted into the other end portion 82 of the coil spring 80. Even with such a structure, the same and similar actions and effects as the circuit breaker 10 of the first embodiment can be obtained.

Second Embodiment
Next, a third embodiment of the circuit breaker 10 will be described. Hereinafter, it demonstrates centering around difference with the circuit breaker 10 of 1st Embodiment.
As shown in FIG. 8, in the circuit breaker 10 of the present embodiment, a flat surface 552 that is parallel to the pressing surface 54 is formed at the tip of the protruding portion 55.

According to the circuit breaker 10 of this embodiment demonstrated above, the effect | action and effect shown by the following (3) can further be acquired.
(3) When the coil spring 80 is pushed into the insertion portion 63 of the separator 60, the protrusion 55 and the coil spring 80 interfere with each other. Therefore, when the tip is sharp like the projection 55 of the first embodiment, the tip of the projection 55 is easily lost when the projection 55 and the coil spring 80 interfere with each other. If the tip portion of the projecting portion 55 is lost, the height of the projecting portion 55 is substantially lowered, and there is a concern that the coil spring 80 can be easily detached from the projecting portion 55. In this regard, if the flat surface 552 is formed at the distal end portion of the protruding portion 55 as in the circuit breaker 10 of the present embodiment, the protruding portion 55 is less likely to be lost. Concerns such as easy removal are less likely to occur.

<Third Embodiment>
Next, a third embodiment of the circuit breaker 10 will be described. Hereinafter, it demonstrates centering around difference with the circuit breaker 10 of 2nd Embodiment.
As shown in FIG. 9, in the circuit breaker 10 of the present embodiment, a step portion 553 is formed at a portion of the protruding portion 55 that faces the insertion opening 636 of the insertion portion 63 so as to be orthogonal to the pressing surface 54. At the same time, an inclined surface 550 is formed continuously with the stepped portion 553. The height H of the stepped portion 553 is set to be shorter than the wire diameter φ of the coil spring 80.

According to the circuit breaker 10 of this embodiment demonstrated above, the effect | action and effect shown by the following (4) can further be acquired.
(4) After the protrusion 55 is inserted into one end of the coil spring 80, when the coil spring 80 is further pushed in, the inner peripheral surface of the coil spring 80 comes into contact with the stepped portion 553. It becomes difficult to push in. Thereby, excessive pushing-in of the coil spring 80 can be suppressed.

<Fourth embodiment>
Next, a fourth embodiment of the circuit breaker 10 will be described. Hereinafter, it demonstrates centering around difference with the circuit breaker 10 of 1st Embodiment.
As shown in FIG. 10, in the circuit breaker 10 of this embodiment, a protrusion 637 is further formed on the lower inner wall surface 632 of the separator 60 with which the other end 82 of the coil spring 80 contacts. The protruding portion 637 is inserted into the other end portion 82 of the coil spring 80.

  In the circuit breaker 10 of the present embodiment, when the coil spring 80 is inserted into the insertion portion 63 of the separator 60, first, the other end portion 82 of the compressed coil spring 80 is inserted into the protruding portion 637 of the separator 60, and the coil By pushing the spring 80 into the insertion portion 63, the protruding portion 55 of the movable contact 50 can be inserted into the one end portion 81 of the coil spring 80.

In the present embodiment, the protrusion 55 of the movable contact 50 corresponds to the first protrusion, and the protrusion 637 of the separator 60 corresponds to the second protrusion.
According to the circuit breaker 10 of this embodiment demonstrated above, the effect | action and effect shown by the following (5) can further be acquired.

(5) Since the protruding portion 637 of the separator 60 is further inserted into the other end portion 82 of the coil spring 80, the both ends 81 and 82 of the coil spring 80 are prevented from coming off. The coil spring 80 can be further prevented from coming off from 63.
(Modification)
Next, the modification of the circuit breaker 10 of 4th Embodiment is demonstrated.

  As shown in FIG. 11, in the circuit breaker 10 of this modification, a groove 638 is formed on the lower inner wall surface 632 of the separator 60 in place of the protrusion 637. The other end 82 of the coil spring 80 is inserted into the groove 638. Even with such a configuration, the coil spring 80 can be further prevented from coming off from the insertion portion 63 of the separator 60 because the both ends 81 and 82 of the coil spring 80 are prevented from coming off.

<Other embodiments>
In addition, each said embodiment can also be implemented with the following forms.
The structure of the circuit breaker 10 according to the fourth embodiment and its modification can be applied to the circuit breaker 10 according to the modification of the first embodiment shown in FIG. That is, in the circuit breaker 10 shown in FIG. 7, the protruding portion 637 and the groove portion 638 may be formed on the pressing surface 54 of the movable contact 50.

-The protrusion part 637 of the separator 60 of 4th Embodiment may be provided with the inclined surface similarly to the protrusion part 55 of the movable contactor 50. FIG.
The separator 60 is not limited to the one that rotates based on the operation of the handle 70, and may be one that operates linearly.

  -This indication is not limited to said specific example. Any of the above specific examples that are appropriately modified by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the specific examples described above, and the arrangement, conditions, shape, and the like thereof are not limited to those illustrated, and can be appropriately changed. Each element included in each of the specific examples described above can be appropriately combined as long as no technical contradiction occurs.

10: Circuit breaker 30: Fixed contact 31: Power supply side terminal 41: Load side terminal 50: Movable contact 54: Pressing surface 55: Protruding portion (first protruding portion)
60: Separator (movable body)
63: Insertion portion 70: Handle 80: Coil spring 81: One end portion 82: Other end portion 550: Inclined surface 551: Orthogonal surface 552: Flat surface 553: Stepped portion 631: Upper inner wall surface (first inner wall surface)
632: Lower inner wall surface (second inner wall surface)
636: Insertion opening 637: Projection (second projection)
638: Groove

Claims (6)

A circuit breaker capable of connecting and disconnecting an electric circuit between a power supply side terminal and a load side terminal by contacting and separating a fixed contact and a movable contact,
A handle operated when connecting and disconnecting the electric circuit;
A movable body that operates in conjunction with the operation of the handle and has a cylindrical insertion portion into which the movable contact is inserted; and
A coil spring disposed in the insertion portion and pressing the movable contact against the first inner wall surface of the insertion portion,
The insertion portion is formed with an insertion opening into which the coil spring can be inserted,
The coil spring is inserted into one of the pressing surface of the movable contact pressed by one end portion of the coil spring and the second inner wall surface of the insertion portion with which the other end portion of the coil spring abuts. A protrusion is formed,
An inclined surface that is inclined with respect to the pressing surface is formed in a portion of the protruding portion that faces the insertion opening so that the height of the protruding portion decreases as the insertion opening of the insertion portion approaches. There is a circuit breaker. The circuit breaker according to claim 1, wherein an orthogonal surface orthogonal to the pressing surface is formed on a portion of the protruding portion opposite to the inclined surface. A step portion that is orthogonal to the pressing surface is formed at a portion of the protruding portion that faces the insertion opening of the insertion portion, and the inclined surface is formed continuously with the step portion. Item 4. The circuit breaker according to Item 1. The circuit breaker as described in any one of Claims 1-3 in which the flat surface parallel to the said press surface is formed in the front-end | tip part of the said protrusion part. When the protrusion is the first protrusion,
5. The second protrusion into which the coil spring is inserted is formed on the other of the pressing surface of the movable body and the second inner wall surface of the insertion portion. Circuit breaker according to item. The groove part in which the said coiled spring is inserted is formed in the other one of the said press surface of the said movable body, and the said 2nd inner wall surface of the said insertion part. Circuit breaker.

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