JPS6136057Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a circuit that reliably and easily provides a mechanism for automatically resetting the circuit after the circuit breaker automatically trips and disconnects the circuit. It is related to disconnection.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a handle, 2 is a shaft attached to the handle 1, 3 is a lever that rotates around the shaft 2, 4 is a shaft, 5 is a link that rotates around the shaft 4, 6 is a roller, and 7 is a shaft attached to link 5 and roller 6, 8 is a push plate that is in close contact with roller 6, 9 is a fixed contact, and 10 is a fixed contact that also serves as a terminal to which an electric wire from the outside is connected. . 11 is a movable contact, and 12 is a movable contact that is in close contact with the push plate 8. A latch 13 prevents the lever 3 from rotating when the circuit is closed.
Reference numeral 14 denotes a shaft, which is the center of rotation of the latch 13. 15
is the frame, 16 is the shaft, 17 is the movable iron piece, and the shaft 16
18 is an oil dump pot, and 19 is an excitation coil, which are pivotally supported on the frame 15. These members 16 to 19 constitute a trip mechanism.
20 is a flexible copper stranded wire, 21 is the movable contact 1
2 is a torsion spring that is a return spring and urges the movable contact 12 in the direction of coming into close contact with the push plate 8. 23 is a terminal for connecting an electric wire from the outside. An excitation coil 19 is also connected. 24 is a torsion spring that rotates the handle 1 in the direction of opening the circuit, and one end is connected to the shaft 4 with the frame 1.
5 is attached to the other end, 25 is a base in which all the parts are housed, 26 is a torsion spring that urges the movable iron piece 17 in the opposite direction to the suction surface of the oil dash pot 18, and 27 is a latch. 13 is a torsion spring that urges the latch 13 by the frame 15 in a direction in which rotation of the latch 13 is stopped.

Next, the operation will be explained. When the handle 1 is operated as shown in FIG. 2 for the purpose of turning on the circuit, the link 5, which is engaged with the handle 1 by the shaft 4, moves, and the tip of the link 5 is further engaged by the shaft 7. The roller 6, which is being pushed down, rolls down the slope of the push plate 8. The roller 6 pushes the lever 3, and the lever 3 rotates around the shaft 2 and is stopped by engaging the tip of the latch 13.

Since the roller 6 pushes the push plate 8 in accordance with the movement of the handle 1 from the position where the lever 2 stops moving, the push plate 8 pushes the movable contact 12 which is biased by the torsion spring 22. is fixed contact 10
move in the direction of contact. Then, shaft 4 is dead.
When the point is passed, the frame 15 and the shaft 4 engage, and the fixed contact 9 and the movable contact 11 are brought into sufficient contact, the closing operation is completed.

In the case of an opening operation, when the handle 1 is operated for the purpose of opening the circuit, the push plate 8 pushes the movable contact 12 until the shaft 4 passes the dead point, after which it is pushed by the torsion spring 22. , the movable contactor 12 pushes up the push plate 8. This movement continues to the position of a stopper (not shown) provided in the base 25. Also, the link 5 connects the handle 1 and the shaft 4.
The handle 1 is engaged with the torsion spring 2.
Since shaft 4 is biased in the direction of the opening operation, shaft 4
When the handle 1 engages with the frame 15, the movement of the handle 1 is stopped.

In the event of a trip, when an overcurrent flows through the excitation coil 19, the movable iron piece 17 shown in FIG.
The oil is attracted in a direction opposite to the direction in which it is biased, and is attracted to the suction surface of the oil dash pot 18. At this time, the movable iron piece 17 rotates around the shaft 16 and the latch 13
is rotated about the shaft 14 in the opposite direction to the biasing direction of the torsion spring 27, so the latch 13 and the lever 2 are disengaged, and the roller 6 further pushes the lever 2, so that the push plate 8 pushes the torsion spring 22 The movable contact 12 is pushed up by the energized force, and the circuit is opened. Next, since the roller 6 is attached to the link 5 by the shaft 7 and the link 5 is attached to the handle 1 by the shaft 4, the roller 6 is pulled up by the torsion spring 24 and engages the slope of the push plate 8. In addition, the lever 3 is engaged with the handle 1 when the handle 1 rotates with the force of the torsion spring 24, and further, when the lever 3 rotates around the shaft 2, the engagement between the lever 3 and the latch 13 is released, and the lever 3 can be re-engaged. The state will be restored.

Since the structure of conventional circuits and disconnectors is constructed as described above, when performing automatic reset after automatic tripping, the lever must be rotated by rotating the handle. However, very high dimensional accuracy is required for the interlocking parts, and if the interlocking relationship is not sufficient, automatic reset may not be possible during assembly.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and instead of rotating the lever by the return force of the handle, the lever itself is rotated in the direction in which the lever touches the push plate. The purpose of this invention is to provide a structure in which automatic resetting can be performed reliably and easily by adding a spring that provides rotational force.

An embodiment of this invention will be described below with reference to the drawings. In FIG. 4, reference numeral 28 denotes a torsion spring, which is engaged with the shaft 2. One end is attached to the frame 15, the other end is applied to the lever 3, and the lever 3 is biased in the direction in which it comes into contact with the push plate 8. 1a indicates the handle 1. Conventionally, this is the part where the lever 3 was rotated in the direction of contacting the push plate 8, but in the present invention, it is a part that is released so as not to engage the lever 3.

It should be noted that the other reference numerals are completely the same as those of the prior art.

When the circuit or disconnector performs automatic tripping, the movable iron piece 17 is attracted to the oil dump pot 18. At this time, the other end of the suction surface of the movable iron piece 17 rotates the latch 13 around the shaft 14, so that the lever 3 is rotated counterclockwise against the spring force of the spring 28 due to the pressing force of the roller 6. , the roller 6 pushes the lever 3 and slides down the inclined surface of the push plate 8. As a result, the pressing force of the pressing plate 8 is released, so that the pressing plate 8 moves in the biasing direction of the torsion spring 22 and breaks the circuit.

Next, the handle 1 rotates around the shaft 2 in the biasing direction of the twisting lever 24, and at this time the link 5 rotates around the shaft 4.
Since the roller 6 is engaged with the handle 1 by the link 5, the roller 6 moves between the push plate 8 and the lever 3 together with the link 5, and when the link 5 stops moving, it is located on the inclined surface of the push plate 8. Also, the lever 3 is a torsion spring 2
According to the biasing direction of the lever 8, the lever moves to a position where it touches the push plate 8, so there is no space between the lever 8 and the latch 13.
I can do it. The latch 13 can therefore be rotated in the biasing direction of the torsion spring 14, completing the automatic reset.

In the above embodiment, the torsion spring 28 is hung on the shaft 2, but this spring may be placed anywhere as long as it biases the lever 3 in the direction of contacting the push plate 8. .

As described above, according to this invention, the release of the lever 8 and latch 13 during automatic reset is
Since this is made possible by the torsion spring 28 which biases the lever 3 in the direction in which it comes into contact with the push plate 8, automatic resetting can be achieved reliably and easily.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a conventional circuit and disconnector in an open state, Fig. 2 is a sectional view showing the closed circuit state, and Fig. 3 is a sectional view showing the automatic tripping state. FIG. 4 is a sectional view showing the structure of a circuit breaker and a circuit breaker according to an embodiment of the present invention in an open state. In the figure, 1...handle, 2...shaft, 3...
... Lever, 4 ... Shaft, 5 ... Link, 6 ... Roller, 8 ... Push plate, 9 ... Fixed contact, 11 ... Movable contact, 12 ... Movable contact, 13 ... Latch,
16-19... trip mechanism, 22... return spring, 28... twist spring. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A handle that opens and closes the circuit from the outside and is normally applied with a spring force in the direction of opening the circuit, a link rotatably connected to one end of the handle, and a roller attached to the tip of this link. When the handle is rotated in the closing direction, it is pushed in by the roller, and the movable contact is rotated against the spring force of its return spring, causing the movable contact provided on the movable contact to contact the fixed contact. a push plate, a lever that is rotatably attached to the rotating shaft of the handle and is pressed against the latch and engaged with the latch by a roller that pushes the push plate; and a lever that is biased in the direction of contacting the push plate. a spring that detects an overcurrent in the circuit and is actuated to drive the latch and disengage the latch from the lever, causing the roller to rotate the lever against the spring force; and a trip mechanism for causing the roller to fall off the pushing plate and releasing the pushing of the pushing plate.