JPS645338Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in circuits and disconnectors that cut off electrical circuits.

FIG. 1 shows an example of a circuit or breaker to which this invention is applied. In the figure, 1 is a cover, 2
is a base, and a housing A is constituted by a cover 1 and a base 2. A sheath cutting mechanism 100 is built into the housing A. The shedding mechanism 100 includes a repulsive contact 3, a movable contact 4 that comes into contact with and separates from the repulsive contact 3,
It has a toggle link mechanism T that separates the movable contact 4 and the repulsive contact 3 when an overcurrent flows, a response device R consisting of an electromagnetic tripping mechanism or a thermal tripping mechanism, and an extinction plate 5. There is. The repulsion contact 3 is provided with a repulsion contact 3a, and the movable contact 4 is provided with a movable contact 4a facing each other, and the extinction plate 5 is disposed near these contacts 3a, 4a. Reference numeral 6 denotes an arm made of an insulating material, and the movable contactor 4 is held by this arm 6 so as to rotate together with the arm 6 about a shaft 7.

8 is a pin pivotally attached to the arm 6, and this pin 8
A lower end portion of a lower link 9 constituting a part of the toggle link mechanism T is coupled to the lower end portion of the lower link 9 . The upper end of the lower link 9 is connected to the lower end of the upper link 11 by a pin 10, and the upper end of the upper link 11 is connected to a cradle 13 by a pin 12. The cradle 13 is rotatably supported on a shaft 14 and has a locking portion 13a at its free end. A spring 15 is stretched between the operating lever 16 and the pin 10.

The response device R is a solenoid 17, a bimetal 1
8, a trip bar 19, a latch 20, a locking lever 21, etc. 22 is the power supply side terminal, 23
2 is a shunt that electrically connects the power supply side terminal 22 and the repulsive contact 3, and 24 is a load side terminal.

Next, the operation will be explained.

In the normal state, by tilting the operating lever 16 to the right, the upper link 11 and lower link 9 are extended, as shown in FIG. 1, and the arm 6 is rotated clockwise about the shaft 7. The movable contact 4a comes into contact with the repulsive contact 3a in order to receive rotational force. At this time, since the locking portion 13a of the cradle 13 is locked to the locking lever 21, the extended state of the upper link 11 and the lower link 9 is maintained, and the contacts 3a and 4a remain in contact. That is, the electric circuit is in a closed circuit state.

Now, in the closed circuit state, if an overcurrent flows in the circuit, solenoid 17 or bimetal 1
8 is activated, the trip bar 19 is rotated clockwise around the shaft 19a, and the latch 20 is moved around the shaft 20.
Rotate counterclockwise around a. As a result, the engagement between the latch 20 and the locking lever 21 is released, and the locking lever 21 is rotated counterclockwise about the shaft 21a by the biasing force of a spring (not shown), and the locking portion of the cradle 13 is rotated counterclockwise. 13a is removed from the locking lever 21. For this reason, the upper link 1
1 and the lower link 9 buckle, and the arm 6 receives a rotational force in the counterclockwise direction about the shaft 7, so that the movable contact 4a opens and separates from the repulsive contact 3a. At this time, the repulsive contact 3 also receives electromagnetic repulsion and rotates clockwise about the shaft 3b, separating it from the movable contact 4. As a result, the electrical circuit is automatically cut off.

By the way, in the above-mentioned circuit breakers and disconnectors, it is necessary to control the position of the movable contact 4 when it is opened, but conventionally a pin 25 is placed above the movable contact 4 as shown in FIG. The position of the movable contact 4 is regulated by bringing the movable contact 4 into contact with the pin 25 when the movable contact 4 is released as shown in FIG.

However, in the conventional circuit breakers and circuit breakers as described above, the movable contact 4 is deformed by the impact when it comes into contact with the pin 25, and this causes contact pressure and other characteristics to change. The disadvantage was that it had a negative impact on In addition, the pin 25 is required as a separate part, which increases the number of components and the number of assembly steps.

This idea was made to eliminate the above-mentioned drawbacks, and provides a circuit breaker that can regulate the position of the movable contact without deforming it, and that can reduce the number of parts and assembly man-hours. The purpose is to

Embodiments of this invention will be described below with reference to the drawings. FIG. 3 is a perspective view of an arm block according to an embodiment of this invention. arm block 60
Arms 61, 62, 63 corresponding to each pole (three poles in this embodiment) of the circuit and disconnector are connected via the shaft portion 26, and each arm 61, 62, 63
each has a pair of side pieces 61a, 62b, and 63c. Arms 61 and 62 and Arm 6
Cam-shaped stoppers 27 and 28 are formed on the shaft portion 26 between the shaft portions 2 and 63. Then, each of the arms 61, 62, 63, the shaft portion 26 and the stopper 2
7 and 28 are integrally molded from resin. Furthermore, movable contacts 41, 42, 43 are inserted into each arm 61, 62, 63 as shown in FIG. The lower link 9 is coupled to 62.

FIG. 5 shows a structure for rotatably supporting the arm block 60 on the base 2. U-shaped bearing portions 29 and 30 are formed on the inner surfaces of the side walls 2a and 2b of the base 2. Further, the base 2 has upright partition walls 2c and 2d for partitioning each pole, and U-shaped bearing portions 31 and 32 and grooves 33 and 34 are formed in the partition walls 2c and 2d, respectively. By supporting the shaft portion 26 of the arm block 60 on the bearing portions 29, 30, 31, 32 and storing the stoppers 27, 28 in the grooves 33, 34, each arm 61, 62, 63
are arranged in the spaces 35, 36, and 37 of each pole, and the arm block 60 is supported by the base 2 so as to be rotatable about the shaft portion 26.

Next, the operation will be explained.

When the electric circuit is in a closed circuit state, the arm block 60 is in the position shown in FIG. 6a, and the stopper 2
7 and 28 are not in contact with the inner walls of the grooves 33 and 34.

Now, when an overcurrent flows through the electric circuit, the arm block 60 rotates to the position shown in FIG. 6b based on the principle described in FIG. 1, and the movable contacts 41, 42, 4
3 opens. At this time, the stoppers 27 and 28 are inserted into the inner walls 33a and 34a of the grooves 33 and 34 at the point P.
By coming into contact with the arm block 60, the upward rotation of the arm block 60 is stopped, and the movable contacts 41, 4
2 and 43 are regulated in position when they are opened.

According to such a configuration, the movable contacts 41, 4
2 and 43, the movable contacts 41, 42, and 43 are not brought into direct contact with the pins, so deformation of the movable contacts due to impact does not occur, which affects characteristics such as contact pressure. Never. Furthermore, since the stoppers 27 and 28 are integrally formed with the shaft portion 26, no separate parts are required, making assembly easy and improving dimensional accuracy.

Furthermore, the circuit breakers and disconnectors of the above embodiments are of a different pole type, and between each pole there are bearing parts 31, 32 and grooves 33, 3.
It communicates at part 4, but stopper 2
7 and 28 are accommodated in the grooves 33 and 34, thereby shielding the spaces between the respective poles. That is, stopper 2
7 and 28 also have a function as an insulating member. In order to achieve more reliable insulation, an insulating plate 38 may be inserted through the upper openings of the grooves 33 and 34, as shown in FIG.

Although the above embodiments have described multipolar circuits and disconnectors, this invention is not limited to multipolar circuits, but can also be applied to unipolar circuits.

As explained above, according to this invention, the shaft part and the stopper are integrally formed on the arm, the shaft part is supported by the bearing part of the base, the stopper is housed in the groove of the base, and the movable contactor is opened and closed. Since the stopper comes into contact with the inner wall of the groove,
The movable contact is not deformed by impact, and its characteristics do not change. Further, the number of parts and assembly man-hours can be reduced, and dimensional accuracy can also be improved.

[Brief explanation of the drawing]

Figure 1 is a front sectional view showing an example of a circuit breaker to which this invention is applied, and Figures 2 a and b illustrate position regulation when opening a movable contact in a conventional circuit breaker. 3 is a perspective view of the arm block in an embodiment of this invention, FIG. 4 is a perspective view showing the arm block holding the movable contact, and FIG. 5 is a perspective view of the arm block. An exploded perspective view of the block and the base, FIGS. 6a and 6b are sectional views of the main parts showing the state of rotation of the arm block, and FIG. 7 is a sectional view of the main parts showing a modified example. 2... Base, 26... Shaft, 27, 28...
Stopper, 29, 30, 31, 32...bearing part,
33, 34...Groove, 33a, 34a...Inner wall, 4
1, 42, 43...Movable contact, 60...Arm block, 61, 62, 63...Arm. In addition,
In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A shaft portion and a stopper are integrally formed on an arm that holds a movable contact, the shaft portion is supported by a bearing portion formed on a base, and the stopper is mounted on the base. A circuit breaker is housed in a formed groove so that the stopper comes into contact with an inner wall of the groove when the movable contact is opened. (2) The groove is formed in a partition wall that partitions between the poles installed on the base, and the gap between the poles is shielded by a stopper housed in the groove. Circuit break. (3) The circuit breaker as set forth in claim 2 of the utility model registration claim, which is formed by inserting an insulating plate into a groove.