JPH0126027Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to increase the separation distance of the movable contacts from the normal open circuit state in a circuit or disconnection device that is opened and closed by a toggle link mechanism using an adjustable operating handle. This increases the separation distance during automatic sheath cutting and improves the shear cutting performance.

Conventionally, this type of toggle link mechanism generally has a structure shown in FIG. That is, 1 is the cover, 2
is a base, 3 is a fixed conductor, and a fixed contact 4 is attached to one end.
The other end serves as a terminal portion to be connected to an external conductor (not shown). Reference numeral 5 denotes a movable element device, and the movable element 6 faces the fixed contactor 4.

Reference numeral 7 denotes a movable arm, which is fixed to the crossbar 8 and is configured to be opened and closed at each pole at the same time. 9 is a toggle link mechanism, with an upper link 10 and a lower link 11
One end of the upper link 10 is connected to the cradle 1.
2, and the other end is connected to the lower link 11. 13 is the connecting shaft. Note that the other end of the lower link 11 is connected to the movable element device 5. Reference numeral 14 denotes a raising/lowering operating handle, and 15 an operating spring, which is suspended between the shaft 13 of the toggle link mechanism 9 and the operating handle 15. Reference numerals 16 and 17 designate thermal and electromagnetic tripping mechanisms, respectively, which rotate the trip bar 21 clockwise by means of a bimetal 19 and a movable iron core 20, respectively, when activated. Reference numeral 22 denotes a latch whose one end is locked to the trip bar 21 and the other end is engaged with the cradle 12. With the cradle 12 engaged with the latch 22, the operating handle 14 can be tilted to the closing position (the position shown in the figure). For example, the toggle link mechanism 9 is extended, the shaft 13 is locked to the cradle 12, and the movable contact 6
is joined to the fixed contact 4. Next, when the operating handle 14 is tilted to the open position (the position shown by the dashed line), the toggle link mechanism 9 is bent and the movable contact 6
is separated from the fixed contact 4, and the movable contact 6 is locked to the frame 23. Furthermore, if an overcurrent flows through the circuit in the closed circuit state, the thermal tripping device 16 or the electromagnetic tripping device 17 is activated, and the cradle 1
2 and the latch 22 are disengaged, and the actuating spring 15
Since the tensile force is applied to the cradle 12, the cradle 12 rotates clockwise about the cradle shaft 121 and is abutted against the stopper portion 23-c of the frame 23.

At this time, since the connection point between the cradle 12 and the upper link 10 exceeds the line of action of the operating spring 15, the spring force of the operating spring 15 causes the toggle link mechanism 9 to
is bent and the crossbar 8 interlocks each pole to automatically cut the sheath. Note that the frame 23 is for holding the above-mentioned mechanism section.

In circuit breakers and circuit breakers configured in this way, there is a means to increase the opening distance in order to improve the breaking ability. , the operating spring force or the operating angle of the tiltable operating handle must be increased. To do this, it is necessary to take up a large space, and the circuits and disconnectors become large.

This design increases the opening distance during automatic disconnection without increasing the operating spring force or operating angle, while keeping the circuit breaker and disconnector small. The purpose is to maintain each state in a stable state when opening by shearing, and the opening of the frame 23 is adjusted so that the bending angle of the toggle link mechanism during normal opening is a constant angle. Stopper 23-a
Furthermore, the stopper position 23-b of the movable contact during automatic shearing is moved upward in the figure to lengthen the separation distance.

The illustrated embodiment will be described below. In FIG. 2, FIG. 3, and FIG. 4, a frame opening indicated by the reference numeral 23-a is newly added, and the upper link 10
This invention relates to the present invention in which the connecting shaft 13 of the lower link 11 passes through the frame 23, and the stopper position of the movable contact 6 is raised upward, and all other members are the same as the conventional device shown in FIG. and
Therefore, the same reference numerals are given. As shown in FIG. 2, this frame stopper 23-a is a stop member provided at the connecting portion between the upper link 10 and the lower link 11 of the toggle link mechanism 9 in the closed state (in this embodiment, the connecting shaft 13 is the stop member). By bringing the frame stopper 23-a into contact with the first stopper portion of the frame stopper 23-a, the linear extension of the upper link 10 and the lower link 11 can also be controlled. Therefore, the fixed contact 4 and the movable contact 6 can make contact, but on the other hand, the third
As shown in the figure, in the open state, the upper link 10 and the lower link are brought into contact by bringing the stop member provided at the connecting portion between the upper link 10 and the lower link 11 into contact with the second stopper portion of the frame stopper 23-a. Link 11
The bending angle can also be controlled so that the bending state is a certain certain degree. Also, as shown in Figure 4, when a large current flows through the circuit or disconnector in a closed state,
The cradle 12 rotates clockwise and is locked to the frame 23 in the same manner as in the conventional device. Furthermore, the movable contact 6 does not stop at the open circuit position shown in FIG. Furthermore, it is possible to maintain a longer separation distance and cut off large currents. Furthermore, at that time, upper link 10 and lower link 1
1, the connecting shaft 13, that is, the stop member, is connected to the hole 2 in the frame.
The movable contact 6 can maintain a separation distance without hitting 3-a. As mentioned above, in the circuit breaker according to this invention, the stopper 23-a in the normal open state and the stopper 23-a in the automatic breaker
Since b is different, it is possible to interrupt large currents by maintaining the separation distance of the movable contact during automatic disconnection without increasing the external size of the circuit or disconnector. Become.

Further, the closed circuit state of the fixed contact and the movable contact device is maintained by using the frame as a stopper, and the above-mentioned normal open circuit state and the open circuit state due to automatic shunting are also maintained by using the frame as a stopper. This has the effect of eliminating the possibility of mistrips occurring due to shock during operation.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional circuit breaker and breaker, Fig. 2 is a side view of the main part of the circuit breaker according to the present invention showing a closed state, and Fig. 3 is a main part showing the same circuit breaker in an open state. The side view and FIG. 4 are also side views of essential parts showing the automatic shearing state. In the figure, 1 is a cover, 2 is a base, 3 is a fixed conductor, 4 is a fixed contact, 6 is a movable contact, 8 is a crossbar, 9 is a toggle link mechanism, 10 is an upper link, 11 is a lower link, 12 1 is a cradle, 13 is a connecting shaft, 14 is an operating handle, 15 is an operating spring, 1
6 is a thermal trip device, 17 is an electromagnetic trip device, 2
1 is a trip bar, 22 is a latch, 23 is a frame, 23-a is a stopper for the toggle link mechanism of the frame, and 23-b is a stopper for the movable element device of the frame. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A movable contact device provided so as to be able to move toward and away from the fixed contact, a lower link connected at one end to the movable contact device, and a toggle link mechanism that is connected to the lower link and together with the lower link. an upper link, a cradle that is normally engaged with a tripping mechanism and connected to the upper link, an erectable operating handle that is connected to the toggle link mechanism by an actuating spring, and a frame that holds these mechanisms. A stop member is provided at the connecting portion of the lower link and the upper link, and the movable contact device contacts the fixed contact with the stop member when the circuit is closed. a first stopper portion that maintains the closed circuit state by causing the movable contact device to come into contact with the stop member when the movable contact device is normally opened; and a second stopper portion that contacts the stop member and maintains the state when the movable contact device is normally opened. and a third stopper portion which brings the tip of the movable contact device into contact with the tripping mechanism to maintain the state when the trip is opened when the trip is opened and the movable contact device operates. A circuit switch or disconnector characterized by being provided with.