JP2726389B2 - Multi-pole breaker for wiring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole circuit breaker having a plurality of fingers operated by a single handle.

2. Description of the Related Art A conventional multi-pole circuit breaker capable of simultaneously opening and closing two or three poles has a plurality of independent fingers 22, 23 which are individually attached to the lower surface of a handle 21 as shown in FIG. The fingers 22 and 23 are connected to each other by a resin plate 24 having excellent insulation properties.
The structure was such that the lower end of the spring 25 was hooked in the middle of the.

In such a conventional multi-pole circuit breaker for wiring, when the handle 21 is tilted to the ON side, the force of the spring 25 is transmitted to the fingers 22, 23 via the resin plate 24, 23 is strongly pressed toward the fixed contact. However, in such a structure, the contact pressure varies between the poles due to the twisting of the fingers 22 and 23, and there is a possibility that poles with insufficient contact pressure may be generated. That is, if the finger 22 comes out of the finger 23 toward the fixed contact due to deformation due to twisting, the contact of the finger 23 with the fixed contact is inhibited by the finger 22 and the contact pressure of the finger 23 is reduced. Smaller than. In conventional multi-pole circuit breakers for wiring, metal fingers 2
Twisting stress tends to concentrate on the joint between the resin plates 2 and 23 and the resin plate 24, and this joint may be damaged.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a multi-pole circuit breaker for wiring in which no pole having insufficient contact pressure is generated and the inside is not likely to be damaged. It was made to provide.

[0005]

The present invention the above object, according to an aspect of was made in order to solve, in the wiring for a multi-pole circuit breaker having a plurality of fingers which are operated by a single handle, the fixed contacts First with movable contact to be pressed
The finger is directly attached to the lower surface of the handle via a spring, and the fixed contact of a different pole from the fixed contact is used.
A second finger provided with a movable contact pressed against the first finger is insulated and elastically attached to the first finger.

[0006]

The multi-pole circuit breaker of the present invention operates a plurality of fingers with a single handle to open and close a plurality of poles at the same time as the conventional one. However, in the present invention, since the second finger is elastically attached to the first finger, each finger can contact the fixed contact of each pole without being hindered by other fingers, and the shortage of contact pressure No poles occur. Further, since no twisting force is generated at the joint portion of each finger as in the related art, there is no possibility of damage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to an embodiment of a two-pole circuit breaker for wiring. 1 to 3 are views showing a first embodiment of the present invention. FIG. 1 is a front view, and FIG.
Sectional view of the L _1-pole side, Fig. 3 is a sectional view of the L _2-pole side. 1 handle in these figures, the first finger 2 corresponding to L _1-pole, 3 second corresponding to different L _2-pole and this
Finger.

The first finger 2 has its bifurcated upper end directly contacted with a rotating shaft 4 formed at the lower portion of the handle 1, and has a strong spring 6 stretched between the first finger 2 and a cradle 5. Is attached to the handle 1 by the pulling force.
And when defeating handle 1 on the side, as shown in FIG. 2, the movable contact 7 of the lower end is in contact with the fixed contact 8 of the L ₁ pole.

On the other hand, the second finger 3 made of synthetic resin, which is an insulator, is pivotally attached to the pin 9 of the first finger 2 so as to be rotatably attached to the first finger 2. Have been. As shown in FIG. 3, the second finger 3 has an arm 10 extending upward, and a spring 11 is provided between the arm 10 and the first finger 2. By the force of the spring 11, the second finger 3 is Tamahatsu about the pin 9 in the clockwise direction in FIG. 3, different from the movable contact 12 attached to the conductive plate 14 at the lower end and L ₁ pole
The fixed contact 13 having _two L poles can be brought into contact. Note that a twist wire (not shown) is connected to the conductive plate.

As described above, since the second finger 3 is elastically attached to the first finger 2,
As in the prior art, one finger is not hindered from contacting the fixed contact by the other finger, and each finger is not hindered.
A few movable contacts 7, 12 can contact the fixed contacts 8, 13 with a uniform contact pressure by the force of the strong spring 6.
For this reason, there is no pole with insufficient contact pressure. Further, according to the present invention, since an unreasonable twisting force does not act on the joint portion between the first finger 2 and the second finger 3 as in the related art, there is no possibility of breakage.

In the second embodiment shown in FIG. 4 and FIG.
Insulator 15 fixed to the lower end of each finger 2
The second finger 3 is slidably attached to the second finger 3. And by the force of a spring 11 provided therebetween, a second finger 3 is always Tamahatsu forward contacting the movable contact 12 at the distal end to the fixed contact 13 of the L ₂ pole.

In the second embodiment, as in the first embodiment , the movable contacts 7 and 12 of the fingers 2 and 3 can contact the fixed contacts 8 and 13 of the respective poles with an equal contact pressure. The contact pressure is not short. In addition, there is no possibility that the joint between the first finger 2 and the second finger 3 may be damaged. In the above embodiment, the second finger 3 is attached to one contact portion, but the second finger 3 may be attached to both contact portions. In the case of three poles, the second finger 3 may be attached to at least one contact portion.

[0013]

As described above, according to the present invention, since the second and subsequent fingers are elastically attached to the first finger, there is no pole with insufficient contact pressure, and each finger is not required. There is no danger that the joints will be damaged. Therefore, the present invention is of great value as a multi-pole circuit breaker for wiring that solves the conventional problems.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment.

2 is a cross-sectional view of the L _1-pole side of the first embodiment.

3 is a cross-sectional view of the L _2-pole side of the first embodiment.

FIG. 4 is a front view showing a second embodiment.

5 is a cross-sectional view of the L _2-pole side of the second embodiment.

FIG. 6 is a front view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Handle 2 1st finger 3 2nd finger 4 Pin 5 Cradle 6 Spring 7 Movable contact 8 L Fixed contact of ₁ pole 9 Pin 10 Arm 11 Spring 12 Movable contact 13 L Fixed contact of ₂ pole 21 Handle 22 Finger 23 Finger 24 Resin plate 25 Spring

Claims (3)

(57) [Claims] 1. A multi-pole circuit breaker for wiring having a plurality of fingers which are operated by a single handle, the stationary contact
A first finger having a movable contact pressed against a point is directly attached to the lower surface of the handle via a spring and pressed against a fixed contact having a different pole from the fixed contact.
A multi-pole circuit breaker for wiring, wherein a second finger provided with a movable contact is insulated and elastically attached to the first finger. 2. The multi-pole circuit breaker according to claim 1, wherein the second finger is rotatably mounted on the first finger. 3. The multi-pole circuit breaker for wiring according to claim 1, wherein the second finger is slidably mounted on the first finger.