JP5400748B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker used in a power circuit, and particularly relates to the shape of a movable contact.

  In a conventional circuit breaker, a movable contact having a movable contact and a shaft pin inserted through the other end, a cross bar for rotatably supporting the movable contact by the shaft pin, and the movable contact of the shaft pin shaft A technology in which a mover receiver provided with a connecting conductor part that is rotatably supported by being sandwiched from both sides in the direction, and a torsion coil spring in which a shaft pin is inserted between the crossbar and the connecting conductor part Is disclosed (for example, Patent Document 1).

Japanese Patent No. 3804352

  However, in the configuration disclosed in Patent Document 1, it is necessary to insert the shaft pin in a state where the movable contact and the torsion coil spring are positioned by the manual operation of the assembly worker, and the shaft until the shaft is assembled into the crossbar. It is also necessary to maintain the position of the pin, so that the assembly workability is poor and the productivity is hindered.

  The present invention has been made to solve the above-described problems, and does not require a shaft pin, reduces the number of parts, and can easily hold the assembly position of the movable contact and the spring to improve the assemblability. A circuit breaker is provided.

The circuit breaker according to the present invention includes a movable contact having a movable contact at a front end portion and a rotation hole at a rear end portion, and a base portion attached to a main body case of the circuit breaker. A movable element receiver having a connecting conductor portion provided with a protrusion that sandwiches both side surfaces of the end portion and engages with a rotation hole of the movable contact element to rotatably support the movable contact element, and the movable element A groove formed on the upper surface of the movable contact so as to follow the shape of the armrest spring portion so that the connection conductor portion of the child receiver is sandwiched from the outside and the movable contact can be rotated around the rotation hole. And a spring with which the above-mentioned arm-rest spring portion is engaged.

  Since the configuration as described above is adopted, it is possible to hold the assembly position of the movable contact and the spring without using a shaft pin as in the prior art, and the circuit breaker has a reduced number of parts with improved assembly workability. It has the effect of becoming a vessel.

FIG. 3 is a partial view showing the movable contact device according to the first embodiment. 3 is a diagram showing a movable contact according to Embodiment 1. FIG. It is a figure which shows the state which combined the movable contact by Embodiment 1, the torsion coil spring, and the needle | mover receiver.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. In the first embodiment, a movable contact device used for a three-pole circuit breaker will be described.
FIG. 1 is a partial view for explaining the configuration of a movable contact device 50 that combines a cross bar 1 for two poles, a mover receiver 2, a movable contact 3, and a torsion coil spring 4 as a spring.
FIG. 2 shows a movable contact 3 for one pole, and FIG. 3A shows a state where the movable contact 3 for one pole, the movable receiver 2 and the torsion coil spring 4 are combined. FIG. 3 (b) is a diagram showing a protrusion 2 e provided on the connection conductor 2 b of the mover receiver 2. The first embodiment is not necessarily limited to three poles, and can be applied to the case of two poles or three poles or more.
As shown in FIG. 1, the crossbar 1 formed of a synthetic resin material or the like in the movable contact device 50 is disposed across three poles in a circuit breaker main body case (not shown) and rotates with respect to the main body case. It is held freely. In other words, the movable contact 3 for three poles is held by one crossbar 1, and when the one-pole movable contact 3 is opened and closed, the other two-pole movable contacts 3 are also opened and closed via the crossbar 1. It is like that.

Referring to FIG. 1, FIG. 3 (a), and FIG. 3 (b), a mover receiver 2 formed of a plate made of a conductive material such as copper is provided with a base portion 2a attached to a main body case (not shown). As shown in FIG. 3 (b), a pair of connecting conductor portions 2b that are raised from the base portion 2a and are opposed to each other in parallel with the tip portion 2d are opposed to each other from the tip portion 2d of the connecting conductor portion 2b. A protruding portion 2e protruding in the direction is provided. The surface on which the protrusion 2e is provided corresponds to a contact surface 2c that is in contact with and sandwiches a rear end side surface 3d of the movable contact 3 described later.
As shown in FIG. 2, the movable contact 3 is provided with a movable contact 3a below the front end portion 3f, and the protrusion 2e of the mover receiver 2 is engaged with a hole 3c provided in the rear end portion 3b. The Accordingly, the movable contact 3 is mounted on the movable receiver 2 and is held so as to be rotatable around the hole 3c. The torsion coil spring 4 includes a pair of coil spring portions 4a, a U-shaped arm-spring spring portion 4b extending so as to connect the pair of coil spring portions 4a, and the arm-spring spring portion 4b in the opposite direction. The leg part 4e is extended, and the leg part 4e is engaged with an engaging part (not shown) of the cross bar 1.

  As shown in FIG. 3 (a), the contact surface 2c of the mover receiver 2 is formed to be parallel to each other with a spacing dimension t slightly narrower than the thickness dimension T of the rear end portion 3b of the movable contact 3. The rear end portion 3b of the movable contact 3 is incorporated and inserted by expanding and bending the distance between the contact surfaces 2c. At this time, the protrusion 2 e of the movable element receiver 2 is engaged with the hole 3 c provided in the rear end 3 b of the movable contact 3. Therefore, the connecting conductor portion 2b elastically holds the rear end portion 3b of the movable contact 3 shown in FIG. 2, and slidably contacts the rear end side surface 3d of the movable contact 3 to form an energization path. doing.

In the torsion coil spring 4, the inner side surface 4 c of each pair of coil spring portions 4 a is formed on the outer surface 2 f of the pair of connecting conductor portions 2 b that sandwich the movable contact 3, and the outer surface 4 d of the coil spring portion 4 a is formed on the outer surface 4 d. It is fitted in a compressed state between a recess (not shown) provided in the crossbar 1. In this way, each of the pair of coil spring portions 4a presses the rear end side surface 3d of the movable contact 3 via each of the pair of connection conductor portions 2b, whereby the movable contact 3 and the connection conductor portion 2b are pressed. The contact pressure between is obtained.
Further, the foot 4e of the torsion coil spring engages with a not-illustrated locking portion of the crossbar 1, and the arm-spring spring portion 4b follows the shape of the arm-spring spring portion 4b on the upper surface 3g of the movable contact 3. Inserted into and engaged with the groove 3e formed. Thus, a rotational moment is given to the movable contact 3 by the moment generated in the arm spring 4b, and a contact pressure is generated between the movable contact 3a and a fixed contact (not shown).

As described above, in the circuit breaker according to the first embodiment, the cross bar 1 and the mover receiver 2 shown in FIG. 1 are fixed to the main body case not shown, and the movable contact 3 can be rotated by the mover receiver 2. Since the torsion coil spring 4 is held by the movable contact 3, the positional relationship between the cross bar 1 and the torsion coil spring 4 is also maintained.
Since such a configuration is adopted, the movable contact 3 can be incorporated into the crossbar 1 with the torsion coil spring 4 incorporated and held, the assembly workability is improved, and the productivity is improved. Thus, the shaft pin for holding the torsion coil spring 4 is not required as in the prior art, the number of components is reduced, and a circuit breaker that is low in cost can be provided as a whole. In addition, you may employ | adopt the structure which uses the coil spring part 4a of the torsion coil spring 4 shown in this Embodiment 1 as a leaf | plate spring.

2 mover receiver, 2a base, 2b connecting conductor, 2c contact surface, 2e protrusion,
3 movable contact, 3a movable contact, 3b rear end, 3c hole, 3d rear end side,
3e groove, 3f tip, 4 torsion coil spring, 4a coil spring,
4b Arm-down spring part, 4c inner surface, 4d outer surface, 50 movable contact device.

Claims (2)

A circuit breaker used in a power circuit,
The circuit breaker has a movable contact provided with a movable contact at a front end and a rotation hole provided at a rear end, and a base mounted on a main body case of the circuit breaker, so that the movable contact A mover receiver having a connecting conductor portion sandwiched between both side surfaces of the rear end portion and provided with a protrusion that engages with the rotation hole of the movable contact member and rotatably supports the movable contact member. And holding the connecting conductor portion of the movable element receiver from the outside, and the armrest spring portion on the upper surface of the movable contact element so that the movable contact element can be rotated around the rotation hole . A circuit breaker characterized in that a spring is formed by engaging the arm-spring spring portion in a groove formed in conformity with the shape . 2. The circuit breaker according to claim 1, wherein the spring is provided with a coil spring portion or a leaf spring connected to the lowering spring portion.

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