JPH025472Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to circuits and disconnectors used in automatic control equipment and switchboards, etc., and in particular to circuits and disconnectors with improved operating parts. It is related to.

(b) Conventional technology Circuit breakers and circuit breakers installed together with other operation switches on control panels such as automatic controllers and switchboards are equipped with an abnormal current detection device that detects abnormal current, and a circuit breaker that detects abnormal current. The device is equipped with a trip mechanism that disconnects the circuit when it detects an overcurrent, and an operation section that manually operates the trip mechanism. This circuit is then disconnected, and the circuit can be opened and closed manually under normal conditions.

On the other hand, for other operating switches that open and close each part of the circuit, push-button switches or rocker-type switches have become popular due to requirements for ease of operation and appearance, and conventional circuit switches and disconnectors have also changed their operating parts accordingly. Some of them were configured with push-button switches or Locker-type switches. This will standardize the operation method of a circuit or disconnector to the operation method of other operation switches installed on the same control panel as the circuit or disconnector, improving the operability and design of the switch. I was doing it.

(c) Problems to be solved by the invention However, because the operating section of conventional circuit breakers and breakers was configured with either a push-button switch or a rocker-type switch, other devices installed on the same control panel When the operation switch is a push button switch, it is not possible to standardize the operation method for circuits and disconnectors equipped with rocker type switches. Furthermore, circuits and disconnectors equipped with pushbutton switches cannot be operated in the same manner as other locker-type switches. In such a case, there was a drawback that the operability and design deteriorated. In addition, manufacturers had to produce both circuits and disconnectors equipped with push-button switches and circuits and disconnectors equipped with Locker-type switches according to demand, which had the disadvantage of increasing costs. .

The purpose of this invention was to make it possible to select either a push button switch or a rocker type switch as the operating unit for manually operating the trip mechanism, and to unify the operation method of other operating switches installed on the same control panel. It is an object of the present invention to provide a circuit and a circuit breaker that can be easily installed to improve operability and design, and can reduce production costs by sharing an abnormal current detection device and a trip mechanism.

(d) Means for solving the problem This invention includes an abnormal current detection device that detects abnormal current in the circuit, and a device that disconnects the circuit when it detects abnormal current. , a circuit disconnector comprising: a trip mechanism that opens and closes a circuit in conjunction with a swingable link; and an operating section having an operating rod connected to the link; A cam that rotates in opposite directions when each of the two push buttons is pressed, and a cam that swings in the same trajectory as the operating rod of the Rocker switch as the cam rotates, and can be freely connected to the link. It is characterized by being equipped with a controlled operation lever.

(e) Effect With the above structure, when a Rocker-type switch is attached to the housing as an operating section, the operating rod of the Rocker-type switch swings in accordance with the operation of the operating handle. When this operating lever is connected to the link of the trip mechanism, the operation of the operating handle is transmitted to the link via the operating lever, and the circuit is opened and closed by the operation of the trip mechanism.

On the other hand, when a push button switch is attached to the housing as an operation section, a cam rotates when the two push buttons are pressed, and the rotation of the cam causes the operation rod to swing. When this operating lever is connected to the link of the trip mechanism, pressing of the two push buttons is transmitted to the link via the cam and the operating lever, and the circuit is opened and closed by the operation of the trip mechanism.

(f) Examples Examples of this invention will be described below with reference to the drawings. First, with reference to FIGS. 1 to 4, the trip mechanism of the circuit breaker and circuit breaker according to the present invention will be explained.

Figures 1, 3 and 4 show when the circuit is disconnected,
In other words, it shows a configuration diagram of the main parts of the trip mechanism when the circuit is opened,
Of these, FIG. 3 shows a block diagram when an abnormal current is detected and a trip occurs, and FIG. 4 shows a block diagram when the trip state in FIG. 3 is shifted to a normal state by the action of a spring. Further, FIG. 2 shows a configuration diagram of the essential parts of the trip mechanism when the circuit is closed.

The circuit breaker integrates an overcurrent detection device A inside a housing 1 and a trip mechanism B that opens a main circuit formed by a movable contact 2 and a fixed contact 3 in response to the operation of the detection device A. In addition to accommodating the targeted block, an operating switch (not shown in FIGS. 1 to 4), which will be described later and which is connected to the trip mechanism B and manually opens and closes the main circuit, is attached to the housing 1.

The overcurrent detection device A is designed to attract the movable piece 7 to the fixed iron piece 6 within a predetermined time period when an overcurrent flows through the coil 5 connected to the main circuit. The movable piece 7 has a substantially L-shape and is rotatably supported by a pin 9 attached to a yoke 8 at the upper end of the vertical piece 7a. Also. The main parts of the trip mechanism B include a first link 22 connected to the operating rod of the operating switch and rotatably supported by a pin 21 in the midsection;
The second link 10, which is rotatably connected to one end of the second link 10, and the third link 12, whose one end is rotatably connected to the midsection of the movable contact plate 11, are connected by a pin 13. It is comprised of a trip rod 14 which is rotatably attached and has a half-moon shaped part 14a which can be freely engaged with and disengaged from the engaging part 10a of the second link 10.

The trip rod 14 and the engaging portion 10a of the second link form a locking means, and in a normal state, when both are in an engaging relationship, the second link 10
and the third link 12 are adapted to move together. That is, in this state, if the first link 22 connected to the operating switch is swung around the pin 21, the movable contact plate 11 is rotated and the movable contact 2
and the fixed contact 3 can be brought into contact with and separated from each other. Then, with the movable contact and the fixed contact 3 closed, that is, the state shown in FIG.
When the engagement between the edge part a and the engaging part a of the second link 10 is released, the second link 10 and the third link 12 move around the pin 13 as a fulcrum due to the action of the return spring 11a of the movable contact plate 11. At the same time, the movable contact 2 is separated from the fixed contact 3,
It becomes a trip state.

The movable piece 7 of the overcurrent detection device A has a free end 7b of the vertical piece connected to the pushing piece 14 of the trip rod 14.
b, and the fixed contact piece 6 of the movable piece 7
With the suction operation to the vertical piece free end 7b
pushes the pushing piece 14b of the trip rod 14,
This trip rod 14 is rotated in the trip direction.

Therefore, when an overcurrent flows through the overcurrent detection device A, the free end portion 7b of the vertical piece is connected to the trip rod 1.
By pushing the pushing piece 14b of No. 4 and rotating the trip rod 14, the main circuit is opened. FIG. 3 shows the state when this trip occurs.

After the circuit is tripped as described above and the circuit moves to the open state, a spring (not shown) attached to the pin 21 applies a rotational force to rotate the first link 22 counterclockwise. The trip mechanism immediately returns to its normal state as shown in FIG. That is, the half-moon-shaped portion 14a of the trip rod 14 and the engaging portion 10a of the second link are engaged again, and by moving the first link 22, the circuit can be opened and closed.

The trip mechanism B described above falls within the range of known technology, and its structure is comparable, as can be seen in Japanese Patent Application No. 52-121144 (Japanese Unexamined Patent Publication No. 54-54280) previously filed by the present applicant. It has the advantage of being simple and having sufficient shearing capacity.

Next, a description will be given of a configuration in which the above-mentioned trip mechanism B is operated in a normal state by an operating switch such as a rocker type switch or a push button type switch.

Figures 5 and 6 show the configuration diagrams of circuits and disconnectors when the circuit is opened and closed when a rocker type switch is used as the operation switch, and Figures 7 and 8 show a push button type switch as the operation switch. A configuration diagram of a circuit breaker and a circuit breaker when the circuit is opened and closed when used is shown. Further, FIG. 9 is a sectional view of the push button type switch, and FIG. 10 is a diagram for explaining the operation of a cam installed inside the push button type switch.

In addition, in FIGS. 5 to 8, the first link 2
2 and a pushing member 15 supported by a pin 17 on the second link 10; a pushing pin 18 at the free end of the pushing member 15 rotates counterclockwise around pin 9 during tripping; a connecting member 16, a switch S for generating an alarm signal or the like at the time of a trip, and an actuator 20 connected to the lever of the switch S and disposed near the tip of the pushing member 15 with terminals facing each other; Each of these is for performing a type 1 trip-all-pole operation when a circuit or disconnector is used in a multi-pole structure. That is, when a plurality of circuit breakers and disconnectors are arranged in a row, if a connecting rod (not shown) is pushed through the through hole 16c of each connecting member 16, any one of the circuit breakers or breakers will be disconnected. When the device trips, all circuits and disconnectors can be tripped.

This configuration has already been proposed by the present applicant in the above-mentioned Japanese Patent Application No. 121144/1982, so a detailed description thereof will be omitted here.

The Rotzker type switch shown in Figures 5 and 6 is
The switch is turned on and off by swinging the operating handle 23 in a seesaw manner. Further, the push-button switch shown in FIGS. 7 and 8 is a switch that is turned on and off by pressing push buttons 24 and 25. Each of the switches is housed in a case 26 and a case 27, and the stepped portion 28 thereof contacts the housing 1, and the operating rods 29 and 30 of the respective switches are in contact with the housing 1.
is rotatably supported on the first link 22 by a pin 31.

Further, the circumferential dimensions of the cases 26 and 27 immediately below the stepped portion 28 are the same, and the pin 31 is designed to be able to be pushed out and removed, so both switches are fixed to the housing 1. At the same time, it can be attached and detached freely. Therefore, any switch can be set for one circuit or disconnector.

First, as shown in FIGS. 5 and 6, when a rocker type switch is used as the switch, the operating state of the trip mechanism accompanying the switch operation will be explained.

In this case, as the operating handle 23 swings like a seesaw, the operating rod 29 integrally formed at a substantially right angle to the handle 23 also swings, so the shape and size of the operating rod 29 can be adjusted appropriately. By using the same configuration, the trip mechanism can be easily brought into the circuit opening/closing state as shown in FIGS. 1 and 2 described above. Furthermore, case 2
6, the operating handle 23 has concave portions (not shown) formed on both sides of the handle 23 that are connected to the case 26.
It is supported by being rotatably engaged with the convex portion 32 of.

Therefore, from the above configuration, if the operating handle is pushed in the direction of arrow A, the trip mechanism B will be folded into the open circuit state, and if the operating handle is pushed in the direction of arrow B, the trip mechanism B will be expanded and the circuit will be in the closed state. .

Next, when a push button type switch is used as the operating switch, the operating state of the trip mechanism accompanying the switch operation will be explained.

In this case, since the first link 22 of the trip mechanism B performs a rocking motion, the up and down motion of the push button must be converted into a rocking motion, and moreover, the operation lever by operating the push buttons 24 and 25 must be converted into a rocking motion. 30 trajectories are
It must be the same as the locus of the operating rod 29 of the Rocker type switch.

In this embodiment, in order to satisfy these requirements, the ninth
As shown in the figure, a cam 33 is housed in a case 27. This cam 33 is integrally formed by intersecting a connecting rod 34 and an operating rod 30 at an obtuse angle.
The tip of the pin 36 is supported by a pin 35 attached to the push button 24, and the intersection portion is attached to the case 27.
It is supported by Therefore, when the push button 24 is pressed down, the cam 33 rotates around the pin 36, and the operating rod 30 also swings accordingly. The movement of this cam 33 is illustrated in FIG. 10. That is, in response to the connecting rod 34 moving up and down in the range of arrow C, the operating rod 30 swings in the range of arrow D. The length of the operating rod 30 and the angle of intersection with the connecting rod 34 are predetermined so that the locus of this swing is the same as the locus of the operating rod 29 of the Rocker type switch.

In addition, when the push button 25 is pressed down, the connecting rod 3 is moved over the pin 36 so that the operating rod 30 swings clockwise.
A protrusion 37 is integrally formed on the extension of the push button 25, and when the lower edge 38 of the push button 25 presses down on this protrusion 37, the cam 33 rotates clockwise and the operating rod 30 accordingly swings clockwise. It seems to be moving.
Further, a spring 39 is interposed between the inside of the push button 25 and the case 27, and constantly pushes the push button 25 upward. Therefore, the position of the push button 25 is the same except when it is pressed down. In this case, push button 24
When the button 25 is pressed down, the protrusion 37
The position of the lower edge 38 is appropriately determined so that it does not come into contact with the lower edge 8. Further, guide members 40 and 41 are integrally formed with each of the push buttons 24 and 25, and guide the up and down movement of the push buttons by slidingly contacting guide surfaces 42 and 43 of the case 27.

From the configuration described above, when the push button 24 is pressed down, the trip mechanism forms a closed circuit state as shown in FIG. 8, and conversely, when the push button 25 is pressed down, the trip mechanism forms an open state as shown in FIG. It can be seen that it is formed.

Therefore, the push button 24 functions as an on button, and the push button 26 functions as an off button.

Therefore, if an overcurrent is detected in the on state, that is, the closed circuit state shown in FIG. 6 or FIG. 8, the trip mechanism B is activated.
causes the trip shown in FIG. 3 and transitions to the OFF state or open circuit state of FIG. 5 or FIG. 7.

In this case, as is clear from the above explanation, whether a locker type switch or a push button type switch is used as the operation switch, the functions as a circuit and a disconnector do not change at all. Moreover, the trip mechanism has a structure with sufficient breaking capacity, and can be a single mechanism that does not need to be changed depending on the type of switch.

(g) Effects of the invention As described above, according to this invention, it is possible to attach any one of a rocker type switch and a push button switch to the same trip mechanism, thereby making it possible to perform other operations on the control panel. It would be easier to unify the operation method of the switch, and if only the housing and trip mechanism were mass-produced, and then the operating switch could be selected and installed according to the usage condition, the operating part could be selected according to the specifications, and the housing and trip mechanism could be mass-produced. By using the trip mechanism and the trip mechanism as common parts, the cost per circuit and disconnector can be reduced, and industrially favorable effects can be obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show the configuration of the main parts of the trip mechanism during tripping or in a normal state;
Figure 6 shows the configuration of the circuit opener and disconnector when a locker type switch is used as the operation switch, and Figures 7 and 8 are diagrams showing the circuit breakers and circuit breakers when a locker type switch is used as the operation switch. A configuration diagram of a circuit breaker and a circuit breaker when the circuit is opened and closed is shown. or,
FIG. 9 is a cross-sectional view of the push-button switch, and FIG. 10 is a diagram illustrating the operation of a cam installed inside the push-button switch. 1... Housing, 29, 30... Operating rod, 3
3...Cam, A...Overcurrent detection device, B...Trip mechanism.

Claims (1)

[Claims for Utility Model Registration] Inside the housing, there is an abnormal current detection device that detects abnormal current in the circuit; A circuit breaker comprising a trip mechanism that opens and closes a circuit in conjunction with a link, and an operating section having an operating rod connected to the link, wherein the operating section includes two push buttons and a a cam that rotates in opposite directions when each of the two pushbuttons is pressed; and an operating lever that swings in the same trajectory as the operating lever of the Rocker-type switch as the cam rotates, and that can be freely connected to the link. A circuit disconnector characterized by comprising: