JPS6029790Y2 - Mounting device for auxiliary equipment in circuit breakers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit breaker, and more particularly to a mounting device for auxiliary equipment including auxiliary equipment in a circuit breaker.

The installation of auxiliary equipment including auxiliary equipment in a conventional circuit breaker is carried out on the base 1 of the circuit breaker, as shown in Figure 1.
It was configured to be assembled within a cover 2 that covers the top.

That is, each component of the circuit breaker is mounted on a base 1 made of a molded insulating material, and is covered with a cover 2 also made of a molded insulating material. A fixed conductor 3 having one end connected to an external conductor and having a fixed contact 4 provided at the other end, a movable conductor 5 having a movable contact 6 facing the fixed contact 4, and a movable conductor 5 having a U-shaped cross section. a movable arm 7 having one end fitted with a crossbar 8 connected to an opening/closing mechanism (not shown), and the other end pivotally attached to the movable conductor 5 in a direction in which the movable conductor 5 approaches and separates from the fixed conductor 3; A compression spring 9 interposed between the movable conductor 5 and the protrusion 7A extending at the tip of the movable arm 7 extinguishes the arc that occurs when the fixed contact 4 and the movable contact 6 connect and separate. Arc extinguishing device 1
0, a connecting conductor 12 provided on the base 1 and having one end connected to the movable conductor 5 via a flexible conductor 11;
An automatic opening/closing device 13 is attached to the other end of the connecting conductor 12 and operates an opening/closing mechanism (not shown) in response to an overcurrent, and an automatic opening/closing device 13 is placed on the base 1 and connected to the automatic opening/closing device 13 by a flexible conductor 14. It consists of a terminal 15.

The attached device 16 is formed in a square shape, and one side of the attachment frame 16A is fixed to a fixed part by a tightening screw 17.
and a microswitch 16B attached to this mounting frame 16A.

Reference numeral 18 in FIG. 1 is a handle, and by moving it in the left-right direction in the same figure, the movable arm 7 is rotated around the crossbar 8 via an opening/closing mechanism (not shown), thereby opening and closing the fixed contact 4 and the movable contact 6. It is something.

Next, regarding the operation of the circuit breaker having the above configuration, the movable contact 6 of the movable conductor 5 and the fixed contact 4 of the fixed conductor 3 shown in the first diagram will be described.
When the movable arm 7 is separated from the attached device 1
The switch actuating piece of the microswitch 16B of No. 6 is pressed, whereby the microswitch 16B is opened or closed via the switch portion, and the signal is cut off or conducted.

Next, when the handle 18 is operated to rotate the crossbar 8 via an opening/closing mechanism (not shown), the movable arm 7 approaches the fixed conductor 3, and the fixed contact 4 and the movable contact 6 come into contact with each other.

In this process, the movable arm 7 moves to the micro switch 16B.
The microswitch 16B is disengaged from the microswitch 16B.
The switch section operates to cut off or conduct the signal.

In addition, when the fixed contact 4 and the movable contact 6 are in contact with each other, that is, when the circuit breaker is on, an overcurrent flows and the automatic opening/closing device 13 passes the movable arm 7 through the opening/closing mechanism (not shown).
Even if the microswitch 16B and the movable arm 7 are rotated, the related operation between the microswitch 16B and the movable arm 7 repeats the same operation as described above.

However, in the circuit breaker with the above configuration, since the attachment of the accessory device 16 is done inside the base 1 and the cover 2, it is necessary to remove the cover 2 during the removal work to install the accessory device 16. However, there are drawbacks such as problems such as foreign matter entering the circuit breaker and parts falling out.

Further, since the microswitch 16B is exposed within the cover 2, there is a problem that the microswitch 16B is damaged by arcs generated by opening and closing the fixed contact 4 and the movable contact 6.

This invention was created by focusing on the above-mentioned conventional problems.
The purpose of this design is to provide a mounting device for auxiliary devices in a circuit breaker that has an improved mounting structure that facilitates the installation and removal of auxiliary devices such as microswitches and prevents damage due to arcing. It is.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 5.
Parts common to those in the figures will be described with the same reference numbers.

A recess 19 having a cross section perpendicular to the operating direction of the handle 18 is formed on the upper surface of the cover 2, and a bottom surface 19 of this recess 19
A mounting frame 20 for mounting the microswitch 16B is attached to B by a tightening screw 22 that is screwed into a screw hole 19A screwed into the bottom surface 19B.

The microswitch 16B is mounted on the side surface of the mounting frame 20.
Terminal devices 21 connected to an external conductor (not shown) are provided and separated from each other by insulating partition walls 20B.

The bottom surface 19B of the recess 19 has a through hole 1 penetrating vertically.
A cylindrical guide member 23 is fitted into the through hole 19C, and a plunger 24 for transmitting the operation of the movable arm 7 to the microswitch 16B is passed through the guide member 23.

Assembly of the auxiliary device 16 based on the above configuration will be explained.

First, the guide member 23 is fitted into the through hole 19C formed in the bottom surface 19B of the recess 19 of the cover 2, and the plunger 24 is fitted into the guide member 23, thereby completing the assembly of the cover 2 and the plunger 24.

Next, the mounting frame 20 to which the microswitch 16B is installed in advance
into the recess 19 from the outside of the cover 2, and tighten the tightening screw 22.
By screwing into the screw hole 19A and tightening it, the mounting frame 2
0 is fixed, and each terminal device 21 faces the open side surface of the recess 19.

The plunger 2 of the auxiliary device 16 incorporated in this way
One end of the microswitch 4 contacts the movable arm 7, and the other end faces the switch operating piece of the microswitch 16B.

Next, the operation of the circuit breaker with the above configuration will be explained.

As shown in FIG. 2, when the fixed contact 4 and the movable contact 6 are separated, one end of the plunger 24 contacts the movable arm 7, and the other end presses the switch operating piece of the microswitch 16B. , and the microswitch 16B is opened or closed.

When the handle 18 is moved from this state, the movable arm 7 rotates clockwise in the figure via an opening/closing mechanism (not shown).

Along with this, the pressing force of the movable arm 7 pressing one end of the plunger 24 is released, so that the microswitch 16B in contact with the other end of the plunger 24 is opened or closed.

As explained above, the circuit breaker auxiliary device mounting device according to the present invention allows the auxiliary device to be installed from the outside of the cover. The device can be installed without removing the cover, which prevents foreign objects from entering the circuit breaker and parts from falling, greatly improving work efficiency.

In addition, the movable arm inside the cover is interlocked with the attached device's microswitch via a plunger that passes through the bottom of the attached device mounting recess on the cover, so even if the microswitch is installed outside the cover, it will not operate. Since the auxiliary equipment is installed outside the cover, the arc generated by the opening and closing of the fixed and movable contacts is interrupted by the cover, thus preventing the auxiliary equipment from being damaged by the arc. The effect of this can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing how an accessory device is attached to a conventional circuit breaker; Fig. 2 is a longitudinal side view showing an embodiment of an attachment device mounting device in a circuit breaker according to the present invention; Fig. 3; 2 is a partial front view showing the arrangement relationship between the microswitch and the plunger in FIG. 2, FIG. 4 is an external perspective view of the circuit breaker before attachment of an auxiliary device, and FIG. 5 is a perspective view of the circuit breaker after attachment. 1...Base, 2...Cover, 3...
...Fixed conductor, 4...Fixed contact, 5...
...Movable conductor, 6.Bending contact, 7.Movable arm, 8.Cross bar 19.Compression spring, 10. Arc extinguishing device, 13... Automatic opening/closing device, 16... Attached device, 16A...
Mounting frame, 16B...Micro switch, 18.
...Bundle, 19...Concavity, 19A.
...Screw hole, 19B...Bottom, 19C.
...Through hole, 20...Mounting frame, 21...
...Terminal device, 22...Tightening screw, 23.
- Curved guide member, 24...Plunger.

Claims (1)

[Scope of utility model registration request] A base made of a molded insulating material and on which components as a circuit breaker are installed; a cover also made of a molded insulating material and covering the base to form a casing; four parts formed on the surface of this cover; an accessory device that is removably housed within the recess and has a terminal device and an opening/closing mechanism; and an accessory device that penetrates the bottom surface of the recess, one end facing the opening/closing mechanism of the accessory device, and the other end facing the opening/closing mechanism inside the housing. 1. A mounting device for an auxiliary device in a circuit breaker, characterized in that the device comprises a plunger that is attached to the opening/closing mechanism, and the operation of the opening/closing mechanism is transmitted to the auxiliary device via the plunger.