JPH0128614Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a circuit or disconnection device having an improved automatic reset structure.

[Technical background of the invention]

Generally, circuit breakers and circuit breakers with an automatic reset structure have a mechanism that automatically resets the circuit breakers or breakers that trip when an abnormal current occurs, but depending on the purpose of use, in addition to the automatic reset function, a trip display function may be added. required to have it. That is, it is necessary to hold the handle at a neutral position (hereinafter referred to as the TRIP position) between the closed circuit position (hereinafter referred to as the ON position) and the open circuit position (hereinafter referred to as the OFF position). For this reason, conventional automatic reset circuits and disconnectors are provided with a trip indicating function by adding a centrally balanced spring to the handle's return spring to hold it in a neutral position.

FIG. 1 shows a conventional circuit breaker, in which a handle 3 pivotally supported on the upper part of a frame 1 by a shaft 2 is biased in the opening direction by a first return spring 4.
The upper end of a first link 6 is pivotally supported on a shaft 5 at the leg portion of the handle 3, the upper end of a second link 8 is pivotally supported on a shaft 7 at the lower end of the first link 6, and The lower end of the contactor 8 is pivotally supported on a crossbar 9, and a movable contactor 10 connected to the crossbar 9 is urged in the opening direction by a return spring 11. One end of a third link 12 is pivotally supported on a shaft 7 at the lower end of the first link 6, and the other end of the third link 12 is attached to a locking shaft 14 that slides within an arcuate long hole 13 of the frame 1. Pivoting and locking shaft 1
4, the catch 16 pivoted on the rotation shaft 15 is the second
The restraint state is maintained at all times by a return spring 17. An armature 18, in which the catch 16 is arranged to be able to be pressed, is attracted by an electromagnetic device 19 and activated when an overcurrent occurs. A torsion coil-shaped trip display spring 20 is attached to the upper shaft 2 of the handle 3 coaxially with the first return spring 4, and one end of the leg is engaged with the stepped part of the handle 3 and the other end is locked. The handle 3 is urged counterclockwise by hanging on the shaft 14.

When the handle 3 is manually rotated counterclockwise from the OFF position to the ON position, the movable contact 10 is rotated counterclockwise via the link mechanism to close the circuit.
The linkage forms and holds the toggle. When the handle 3 is manually rotated clockwise from the ON position, the toggle of the link mechanism collapses and the first return spring 4
This brings the movable contact 10 to the OFF position and opens the circuit. When an overcurrent flows through the circuit in the ON position, the armature 18 is attracted to the electromagnetic device 19, rotating the catch 16 clockwise, the locking shaft 14 is instantly disengaged, the link mechanism collapses, and the movable contact 10 is opened, the handle 3 is rotated clockwise by the first return spring 4 as shown in FIG. 2, and the trip display spring 20 is biased clockwise, causing the force _F1 to and the first return spring 4
The position where the moment due to the force _F2 and the moment due to _F1 of the trip display spring 20 are balanced.
It is held in the TRIP position and automatically indicates a discontinuation condition.

[Problems with background technology]

However, since the engagement between the catch 16 and the locking shaft 14 is balanced with a small amount of force, when the movable contact 10 opens and separates when the handle 3 is manually rotated from the ON position to the OFF position. The engagement is disengaged due to the impact, and the locking shaft 14 moves counterclockwise within the elongated hole 13. For this reason, the handle 3 is brought to the TRIP position by the action of the trip display spring 20, and it shows the same state as the automatic shattered state even though no overcurrent is flowing, resulting in an error caused by an overcurrent accident. There was a drawback that there was a risk that this would lead to serious inconvenience.

[Purpose of invention]

The present invention has been developed in view of the above-mentioned drawbacks, and provides a circuit breaker in which the handle is placed in the TRIP position only when the overcurrent is automatically cut off, thereby preventing malfunction when the handle is manually operated to open the circuit. The purpose is to

[Summary of the idea]

In other words, by attaching a spring to the movable contact that presses the catch of the tripping device in the return direction in the open position and does not operate in the closed position, the engagement between the catch and the locking shaft is prevented by the impact of the manual opening operation. It is designed to be held in place to prevent malfunction.

[Example of idea]

An embodiment of the present invention shown in the drawings will be described below. In FIG. 3, the same parts as in FIG. 1 are denoted by the same reference numerals, and explanations thereof will be omitted.

A fixed contact, a movable contact 10 that is biased in the opening direction by a spring 11 for returning to the fixed contact, and a movable contact 10 that is biased in the opening direction by a first return spring 4. One ends of the first, second, and third links 6, 8, and 12, which are activated by an external force that operates the handle 3, are centrally supported on a movable shaft 7, and the other ends of the first link 6 are The end of the second link 8 is pivotally supported on the shaft 5 of the leg of the handle 3, the other end of the second link 8 is pivotally supported on the crossbar 9 of the movable contact 10, and the other end of the third link 12 is provided on the frame 1. arc-shaped long hole 1
The locking shaft 14 is pivoted on a locking shaft 14 sliding inside the locking shaft 14.
is a second return spring 17 that is pivotally supported on the rotation shaft 15;
The electromagnet device 1 is always kept in a restrained state during overcurrent.
The catch 16 is rotatable by being pressed by the armature 18 of 9, and the opening/closing device is actuated via a link mechanism consisting of the first, second, and third links. In a circuit or disconnection device consisting of a trip device that disengages the link mechanism and opens the movable contact 10 in the closed circuit state, one end is engaged with the movable contact 10 and the other end is in the open position. A torsion spring 21 that presses and restrains the catch 16 of the tripping device is attached to the crossbar 9 of the movable contact 10.

That is, the difference from the conventional example shown in FIG.
A torsion spring 21 is provided which engages the lower end of the catch 16 and presses the catch 16 in the return direction only in the open position.

Next, the effect will be explained. When the handle 3 is manually rotated counterclockwise from the open state shown in FIG. 3 as shown in FIG. 4, the movable contact 10
is closed. At this time, the other end of the torsion spring 21 is separated from the catch 16, and has no relation to the closing operation of the sheath breaker and the opening operation of the automatic sheath breaker.

In the closed circuit state shown in FIG. 4, when an overcurrent flows, the armature 18 is attracted by the electromagnetic device 19, and the catch 16 rotates clockwise around the rotation shaft 15, thereby connecting the catch 16 and the locking shaft 14. The locking shaft 14 moves to the left inside the elongated hole 13, the link mechanism collapses, and the movable contact 10 rotates clockwise by the return spring 11 to open the circuit. At the same time, the handle 3 is held at the TRIP position as shown in FIG. 5 by the action of the first return spring 4 and the trip display spring 20. Next, when the handle 3 is manually rotated clockwise to the OFF position, the locking shaft 14 engages with the catch 16 and returns to its original position.

Next, when the handle 3 is manually rotated clockwise from the closed circuit state shown in FIG. 4 to the open circuit state shown in FIG. In order to press the
The movement of the catch 16 is restricted. Therefore, the engagement between the catch 16 and the locking shaft 14 is maintained even if there is an impact from the opening operation, and the link mechanism does not collapse, so that the handle 3 is held in the OFF position.

[Effect of idea]

As described above, according to the present invention, a spring is attached to the movable contact in the circuit breaker or disconnector, which urges the catch of the tripping device in the return direction in the open position, but does not operate in the closed position. By keeping the handle in a neutral state only when current flows, it automatically indicates the deflation state, and when manually opening the circuit, the automatic deflation state is not erroneously indicated, so there is no malfunction and the deflation state is accurately detected automatically. This has the effect of clearly indicating the actions caused by the accident.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing a conventional circuit breaker.
Figure 2 is an enlarged vertical sectional view showing the main parts of Figure 1;
The figure is a vertical cross-sectional view showing an embodiment of the circuit breaker of the present invention in an open state, FIG. 4 is a vertical cross-sectional view showing the main part in a closed circuit state, and FIG. 5 is a longitudinal cross-sectional view showing the main part in an automatic break state. FIG. 1...Frame, 2...Handle shaft, 3...
Handle, 4... First return spring, 5... Leg shaft, 6... First link, 7... Lower shaft, 8...
... Second link, 9 ... Cross bar, 10 ... Movable contact, 11 ... Return spring, 12 ... Third link, 13 ... Long hole, 14 ... Locking shaft, 15 ...
... Rotation shaft, 16 ... Catch, 17 ... Second return spring, 18 ... Armature, 19 ... Electromagnet device, 20 ... Trip display spring, 21 ...
Torsion spring.

Claims (1)

[Scope of utility model registration request] A first link is rotatably connected to a handle rotatably supported on the frame via a shaft, a second link is connected to the first link via a first shaft, The other end of this second link is connected to a movable contact via a crossbar, and the shaft of the handle is wound around, and a first return spring is stretched between the frame and the first link. Furthermore, a locking shaft that slides in an arc-shaped elongated hole provided in the frame is locked to the catch rotatably supported on the frame via a rotation shaft, and the locking shaft is A third link at one end is connected to a first shaft connecting the first link and the second link, and a second return link is formed between the frame and the catch by winding the rotating shaft of the catch. When the spring is tensioned, the catch rotates against the second return spring due to the rotation of the armature that is attracted by the electromagnetic device when tripping, releasing the locking shaft and releasing the link mechanism, thereby creating a movable contact. In a circuit breaker in which a child rotates to maintain a closed state, the crossbar of the movable contact is wound around the crossbar, and one end of the crossbar is engaged with the movable contact;
A torsion spring having an extending end is provided at the other end between the link mechanism and the catch, and when the handle is off, the extending end of the torsion spring engages to press the catch in the direction of return of the catch. A circuit or disconnector characterized in that when the torsion spring is turned on, the extending end of the torsion spring does not engage with the catch.