JP6314329B2 - Circuit breaker for wiring - Google Patents

Description

  The present invention relates to a circuit breaker for wiring using an elastic member as a movable contact.

  As the movable contact of the circuit breaker for wiring, a structure in which a metal plate is bent to give rigidity is normal, but as shown in Patent Document 1, an elastic member is used for the movable contact. A circuit breaker for wiring is also used. The movable contactor of the circuit breaker of this patent document 1 is comprised by the leaf | plate spring, the base part is fixed to an electric circuit part, and the center part is moved below by the crossbar, and the movable part provided in the front-end | tip In this structure, the contact is pressed against the fixed contact.

  In such a circuit breaker, the crossbar is lowered and the contact is turned on by operating the handle, but when an overcurrent or the like is detected, the tripping device operates to raise the crossbar and raise the movable contact Let The trip device includes a trigger lever, and the trigger lever is biased in a predetermined direction by a trigger spring. For this reason, the trigger spring must be manufactured and assembled separately. In addition, depending on the type of circuit breaker for wiring, an instantaneous spring for an instantaneous trip device or a crossbar spring for returning the crossbar may be required.There are multiple types of springs inside the circuit breaker. It was necessary to incorporate. As a result, the number of parts was large and the number of assembly steps was also large.

JP 2006-236732 A

  Accordingly, an object of the present invention is to provide a circuit breaker that solves the above-described conventional problems, reduces the number of springs to be incorporated therein, reduces the number of parts, and can improve assembly. It is to be.

In order to solve the above problems, the present invention provides a circuit breaker using an elastic member as a movable contact, and other members on the opposite side of the movable contact with respect to the crossbar engaging portion of the movable contact. An urging part for urging the urine is formed .

The urging portion may be an instantaneous spring, a trigger spring, a crossbar spring or the like of an instantaneous trip device. Two or more of these can also be used. Moreover, it is preferable to form the said biasing part on the opposite side to a movable contact with respect to the electric circuit connection part of a movable contact .

  Since the circuit breaker according to the present invention uses a part of the movable contact made of an elastic member as a biasing portion that biases another member, the number of springs incorporated in the circuit breaker can be reduced. Thus, the number of parts can be reduced and the assembly workability can be improved.

In the present invention, since the movable contact of the urging unit relative to the crossbar engaging portion of the movable contact formed on the opposite side, not adversely affect the operation of the movable contact, as claimed in claim 6 In addition, if the biasing part is formed on the opposite side of the movable contact with respect to the circuit connection part of the movable contact, the operation of the movable contact is not adversely affected and the spring force of the biasing part is set finely. can do.

It is a longitudinal cross-sectional view which shows the internal structure of the circuit breaker for wiring of 1st Embodiment. It is an expansion perspective view of the principal part. It is a longitudinal cross-sectional view which shows the internal structure of the circuit breaker for wiring of 2nd Embodiment. It is an expansion perspective view of the principal part. It is a longitudinal cross-sectional view which shows the internal structure of the circuit breaker for wiring of 3rd Embodiment. It is an expansion perspective view of the principal part. It is a longitudinal cross-sectional view which shows the internal structure of the circuit breaker for wiring of 4th Embodiment. It is a longitudinal cross-sectional view which shows the internal structure of the circuit breaker for wiring of 5th Embodiment. It is a longitudinal cross-sectional view which shows the internal structure of the circuit breaker for wiring of 6th Embodiment.

Preferred embodiments of the present invention are shown below.
FIG. 1 is a longitudinal sectional view showing the internal structure of the circuit breaker according to the first embodiment.

  In these figures, 1 is a case, 2 is a plug terminal provided on the power supply side, and 3 is a load side terminal provided on the load side. A fixed contact 4 is provided below the load side terminal 3. Reference numeral 5 denotes a movable contact having a movable contact 6 at the tip, which is made of a leaf spring which is an elastic member. The base of the movable contact 5 is fixed to the upper end of the instantaneous tripping device 7 by a rivet 8 and serves as an electric circuit connection.

  A handle 9 is provided at the top of the case 1 so as to be rotatable about the shaft 10. A latch 12 is connected below the handle 9 via a link 11. One end of the latch 12 is supported by a protrusion 14 of a trigger lever 13 that is a tripping member, and the other end is supported by an upper end of a cross bar 15 that is a driving member. Although the crossbar 15 is always urged upward by the crossbar spring 16, in the state of FIG. 1 in which the handle 9 is in the on position, the crossbar 15 is pushed down by the link 11, whereby the movable contact 4 is also pushed down and moved. The contact 6 is in contact with the fixed contact 5.

  The trigger lever 13 is swingably supported by a central shaft 17, but its lower part is urged to the left in FIG. 2 by an urging portion 18 formed in a part of the movable contact 5. The urging portion 18 is a trigger spring. In this embodiment, the urging portion 18 is formed by bending the end portion of the movable contact 5 upward in a U-shape as shown in FIG. In FIG. 2, a through hole 19 is formed to finely adjust the spring elasticity.

  Reference numeral 20 denotes a leakage trip device. When the ZCT detects a leakage current, the upper portion of the trigger lever 13 is pulled leftward to disengage the latch 12 from the protrusion 14 of the trigger lever 13 and cause a trip. At this time, the crossbar 15 is moved upward by the crossbar spring 16, and the movable contact 5 is moved upward by its own elasticity to leave the fixed contact 4. In addition, when a large current flows due to a short circuit accident or the like, the iron piece 22 of the instantaneous tripping device 7 is attracted and the lower side of the trigger lever 13 is moved rightward to perform a trip operation in the same manner. Reference numeral 23 denotes a bimetal for overcurrent tripping, and when it is bent due to overcurrent, the lower side of the trigger lever 13 is moved rightward to similarly perform a trip operation.

As described above, in the first embodiment, a part of the movable contact 5 made of an elastic member is used as the urging portion 18 that functions as a trigger spring for urging the trigger lever 13, so that the number of parts can be reduced. In addition, the assembly workability can be improved. Further, as described above, the urging portion 18 is formed at the position where the movable contact 5 is pressed by the crossbar 15 , that is , on the electric circuit side (the side opposite to the movable contact 6 ) from the crossbar engaging portion. Thus, the operation of the movable contact 5 is not affected. In particular, in the first embodiment, the urging portion 18 is provided on the side opposite to the movable contact 6 with respect to the electric circuit connection portion 24 of the movable contact 5, so that the influence on the movable contact 5 is eliminated.

  FIG. 3 is a longitudinal sectional view showing the internal structure of the circuit breaker for wiring according to the second embodiment, and FIG. 4 is an enlarged perspective view of the main part. In the second embodiment, the end of the movable contact 5 made of an elastic member is bent upward in a U-shape to form a biasing portion 25 that biases the crossbar 15 upward. This urging portion 25 acts in the same manner as the crossbar spring 16 shown in FIG. The position of the urging unit 25 is the same as that of the urging unit 18.

  FIG. 5 is a longitudinal sectional view showing the internal structure of the circuit breaker for wiring according to the third embodiment, and FIG. 6 is an enlarged perspective view of the main part. In the third embodiment, the vertical side 26, the horizontal side 27, and the protruding side 28 are bent from the middle of the movable contact 5 made of an elastic member to form a biasing portion 29 that biases the crossbar 15 upward. ing. The urging portions 25 and 29 in the second and third embodiments are both formed closer to the electric circuit side than the crossbar engaging portion of the movable contact 5.

  In 4th Embodiment shown in FIG. 7, the edge part of the movable contact 5 which consists of elastic members is bent below, and the urging | biasing part 30 which urges | biases the iron piece 22 of the instantaneous tripping apparatus 7 is formed. The urging portion 30 functions as an instantaneous spring.

  In the fifth embodiment shown in FIG. 8, an urging portion 18 similar to that of the first embodiment is formed at the end of the movable contact 5, and a crossbar similar to that of the third embodiment is provided in the middle of the movable contact 5. A biasing portion 29 that biases 15 upward is formed. In the sixth embodiment shown in FIG. 9, the movable contact 5 is formed with the urging portion 18 similar to the first embodiment and the urging portion 30 acting as an instantaneous spring similar to the fourth embodiment. Is. Thus, it is also possible to form a plurality of urging portions.

  As described above, the circuit breaker according to the present invention is a component in which part of the movable contact 5 made of an elastic member is used as the urging portions 18, 25, 29, and 39 for urging other members. There is an advantage that the number of points can be reduced and the assemblability can be improved.

DESCRIPTION OF SYMBOLS 1 Case 2 Plug terminal 3 Load side terminal 4 Fixed contact 5 Movable contact 6 Movable contact 7 Momentary trip device 8 Rivet 9 Handle 10 Shaft 11 Link 12 Latch 13 Trigger lever 14 Protrusion 15 Crossbar 16 Crossbar spring 17 Shaft 18 Energizing part 19 Through-hole 20 Leakage tripping device 22 Iron piece 23 Bimetal 24 Electric circuit connection part 25 Energizing part 26 Vertical side 27 Horizontal side 28 Protruding side 29 Energizing part 30 Energizing part

Claims (6)

In the circuit breaker for wiring using an elastic member as a movable contact, an urging portion for urging other members is formed on the opposite side of the movable contact to the crossbar engaging portion of the movable contact. A circuit breaker for wiring.   The circuit breaker according to claim 1, wherein the urging portion is a trigger spring that urges the trigger lever.   The circuit breaker according to claim 1, wherein the urging portion is an instantaneous spring of an instantaneous trip device.   The circuit breaker according to claim 1, wherein the urging portion is a crossbar spring that urges the crossbar.   2. The circuit breaker according to claim 1, wherein the urging portion is at least two of an instantaneous spring, a trigger spring, and a crossbar spring of an instantaneous trip device. The circuit breaker according to any one of claims 2 to 4, wherein the urging portion is formed on the opposite side of the movable contact with respect to the electric circuit connecting portion of the movable contact .

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