JPH0239330Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a circuit or disconnector configured to display the status based on the position of the handle.

[Technical background of the invention] It is preferable for a small circuit or disconnector to have a simple structure and to have many functions.
One of its functions is to display whether the circuit is closed, manually opened, or automatically opened due to overcurrent. , as indicated by the position of the handle. That is, as shown in FIGS. 5 and 6, the handle 1 is held at the position shown by the broken line when the circuit is closed, and at the position shown by the solid line when the circuit is manually opened. When the circuit is opened (tripped), it is held at the position shown by the two-dot chain line. In this case, the configuration for holding the handle in the trip position is as shown in FIG. Torsion coil spring 5 for tripping on the other end side
The handle 1 is held at an intermediate position between the open position and the closed position by the balance of the spring force of both coil springs 4 and 5.

[Problems with the Background Art] In the above configuration, variations in the spring force of the two coil springs 4 and 5 directly result in variations in the trip position of the handle 2. Since the trip position of the handle 1 changes even due to slight variations in mutual frictional resistance, both coil springs 4 and 5
The spring force of should be strictly controlled. In addition, since both coil springs 4 and 5 are provided between the handle 1 and the frame 2, the width dimension b of the handle 2 is relative to the width dimension a of the frame 2, which is inevitably determined from the external dimensions of the shredder. became small, and there was a problem that the handle 1 made of insulating material was damaged at the part where the shaft 3 penetrated.

[Purpose of the invention] The present invention is a circuit that can hold the handle in the trip position without any variation in the position without strict control of the spring force, and can prevent damage to the handle. and provide disconnectors.

[Summary of the invention] The invention consists of a handle rotatably supported by a frame, an intermediate link connected to the handle, and a handle connected to the intermediate link with one end always being locked to the catch. comprising a holding link that presses the movable contact at the end side to hold it in contact with the fixed contact; and a tripping device that releases the holding link from the catch when an overcurrent is detected;
By operating the handle from the closed position to the open position and by causing the tripping device to release the catch from the hold-down link, the movable contact is released from the pressure by the hold-down link and is separated from the fixed contact. A tension spring is disposed between the frame and the intermediate link to hold the handle in the intermediate position between the open and closed positions when the movable contact is opened by the operation of the tripping device. This is characterized by the fact that it is covered with

[Embodiment of the invention] An embodiment of the invention will be described below based on FIGS. 1 to 4.

In FIG. 1, reference numeral 11 denotes a case for a circuit or disconnector, which is composed of an upper case 12 and a lower case 13 made of an insulating material such as plastic. Reference numeral 14 denotes a contact portion for breaking the circuit disposed within the case 11, and is composed of a fixed contact 15 and a movable contact 16. The fixed contact 15 is fixed to the lower case 13 and has a contact 1 at one end inside the case 11.
5a, and a terminal portion 15b for connecting a power source cable is formed at the other end outside the case 11. Further, the movable contact 16 has a proximal end rotatably supported by a magnetic member 18 of an electromagnetic tripping device 17, and a contact 16a opposite to the contact 15a of the fixed contact 15 is fixed to the distal end. . The movable contactor 16 is connected to one end of the electromagnetic coil 19 of the tripping device 17 via a flexible conductor 20. still,
A terminal 21 for connecting a load side cable is brazed to the other end of the electromagnetic coil 19. 22
is a separation spring made of a compression coil spring, which always urges the movable contact 16 upward in the separation direction. Reference numeral 23 denotes a cross bar for pushing down the movable contact 16, which is fitted and supported in a cylindrical portion 24 protruding from the inner bottom of the lower case 13 so as to be movable up and down.
Reference numeral 25 denotes an operating mechanism, and as shown in FIG. It consists of an intermediate link 30 that is connected to the intermediate link 30 via the frame 26, and a presser link 32 that connects the middle part between both ends to the lower end of the intermediate link 30 via a connecting pin 31, and the connecting pin 31 is a long hole formed in the frame 26 It is inserted and supported by 33. A catch 34 is rotatably supported by the frame 26 via a shaft 35, and has pins 36 and 37 on both sides of the top and bottom of the shaft 35. In the state shown in FIG. 1, the presser link 32 is brought into movable contact by having one end engaged with the lower pin 37 of the catch 34 and pressing down the cross bar 23 at the other end. The child 16 is brought into contact with the fixed contact 15 against the spring force of the separation spring 22. Reference numeral 38 denotes a movable iron piece of the tripping device 17. When an overcurrent flows through the electromagnetic coil 19, the magnetic force of the coil 19 resists the spring force of the tension coil spring 39.
The catch 34 is rotated in the direction of arrow B. Reference numeral 40 denotes a tension coil spring for holding the handle 28 in the trip position, one end of which is hooked onto the intermediate link 30, and the other end of which is hooked onto the frame 2.
6 is hung on a protrusion 26a which is bent corresponding to the other end side of the presser link 32. In this case, the tension coil spring 40 is applied to the shaft 27, the pin 29, and the intermediate link 30 when the handle 28 is in the vertical upright position as shown in FIG.
The hook part of the tension coil spring 40 and the hook part of the tension coil spring 40 to the protruding piece 26a of the frame 26 are stretched so that they are aligned in a straight line. At this time, the tension coil spring 40 is tensioned even when its length is at its shortest.

Next, the operation of the above configuration will be explained.

FIG. 1 shows a case where the movable contact 16 is in contact with the fixed contact 15 in a closed circuit state. That is, one end side of the presser link 32 is connected to the pin 37 of the catch 34.
and the intermediate link 30 is locked to the handle 2.
8, the presser link 32 moves in the direction of arrow C around the pin 37 of the catch 34.
The movable contact 16 is brought into contact with the fixed contact 15 by rotating the cross bar 23 in the other end. In this state, the pin 29 is located to the right in the figure of the straight line D connecting the shaft 27 and the connecting pin 31, and the separation spring 22 is set to a larger spring force than the tension coil spring 40. is held by

When the handle 28 is rotated in the direction of the arrow E from this closed state, the intermediate link 30 is pulled up, and the presser link 32 is also rotated in the opposite direction to the arrow C around the pin 37 of the catch 34.
Accordingly, the movable contact 16 rotates upward while pushing up the cross bar 23 due to the spring force of the separating spring 22, and is separated from the fixed contact 15 to be in an open state as shown in FIG.

When the handle 28 is rotated in the direction opposite to the arrow E from this open state, the intermediate link 30 is pushed down, so the presser link 32 is rotated in the direction of the arrow C around the pin 37 of the catch 34. Push down the cross bar 23 at the other end. This causes the movable contact 16 to release the spring 22 for separation.
The fixed contact 15 rotates downward against the spring force of
The circuit returns to the closed state shown in FIG.

Now, in the closed circuit state shown in FIG. 1, when an overcurrent flows through the circuit or breaker, the movable iron piece 38 is attracted by the electromagnetic coil 19, rotates in the direction of arrow A, and comes into contact with the pin 36 of the catch 34. This catch 34 is rotated in the direction of arrow B. Then, catch 34
4, the movable contact 16 is released from the release spring 22 as shown in FIG.
The presser link 32 is connected to the connecting pin 31 by the spring force.
While rotating in the direction of arrow F about the center, it is rotated upward and separated from the fixed contact 15. On the other hand, when the hold-down link 32 is released from the catch 34, the hold-down link 32 becomes free and the spring force of the separation spring 22 is no longer applied to the operating mechanism 25. The spring force causes the handle 28 to move from the closed position shown in FIG.
7 in the direction of arrow E, and the intermediate link 30 rotates in the direction of arrow G about pin 29. At this time, the handle 28 and the intermediate link 30 are aligned in a straight line with the shaft 27, the pin 29, the hook part of the tension coil spring 40 on the intermediate link 30, and the hook part of the tension coil spring 40 on the protrusion 26a of the frame 26. They rotate until they are lined up and are held in that state by the spring force of the tension coil spring 40. Accordingly, the handle 28 is held in a vertical position as shown in FIG. 4, or in a trip position intermediate between the closed position shown in FIG. 1 and the open position shown in FIG.

To return the circuit from this tripped state to the closed state shown in FIG. reach the goal.
That is, when the handle 28 is rotated in the direction of arrow E from the tripped state shown in FIG. It rotates in the opposite direction to the arrow F around the abutting part, and as a result of this rotation, the pin 37 of the catch 34 is pushed away at one end side, passing through this pin 37, and the presser link 32 is thereby moved. Pin 37 of catch 34
(See Figure 3). Then, when the handle 28 is rotated in the direction opposite to the arrow E, the intermediate link 30 is pushed down, so the presser link 32 rotates in the direction of the arrow C around the pin 37 of the catch 34, and crosses The movable contact 16 is rotated downward via the bar 23 against the spring force of the separation spring 22 and comes into contact with the fixed contact 15 .

According to the above configuration, when tripping, the handle 28
is rotated until the shaft 27, pin 29, hooking portion of the tension coil spring 40 to the intermediate link 30, and the hooking portion of the tension coil spring 40 to the protrusion 26a of the frame 26 are aligned in a straight line and then stopped. Therefore, the stopping position is always constant regardless of the strength of the spring force of the tension coil spring 40, and therefore there is no need to strictly control the spring force. Furthermore, since the tension coil spring 40 is not disposed between the side surface of the handle 28 and the frame 26, the width of the handle 28 can be set large.
This increases the strength of the handle 28 and reduces the risk of breakage.

[Effects of the invention] As explained above, the present invention makes it possible to hold the handle in the trip position without strict control of the spring force and without variations in position, and also increases the strength of the handle. This has the excellent effect of preventing damage as much as possible.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a longitudinal sectional view in a closed state, Figure 2 being an enlarged side view of the main parts, and Figure 3 being in a manually opened state. 4 is a vertical sectional view shown in a tripped state, FIG. 5 is a partially cutaway view showing an example of a conventional circuit breaker, and FIGS. 6 a, b, and c are handles. FIG. 3 is a left side view, a front view, and a right side view showing a conventional structure for holding the holder in the trip position. In the figure, 11 is a case, 15 is a fixed contact, 16
17 is a movable contact, 17 is a tripping device, 22 is a spring for opening, 25 is an operating mechanism, 26 is a frame, 26a
28 is a handle, 30 is an intermediate link, 3
2 is a presser link, 34 is a catch, and 40 is a tension coil spring (tension spring).

Claims (1)

[Claims for Utility Model Registration] 1. A handle rotatably supported by a frame, an intermediate link connected to the handle,
A hold-down link is connected to this intermediate link and normally has one end locked to the catch while pressing the movable contact at the other end to hold the movable contact in contact with the fixed contact. and a tripping device that releases the locking of the presser link by the catch, and the handle is movable by operating the handle from the closed position to the open position and the tripping device releasing the locking of the presser link by the catch (trip). In a circuit switch or disconnector in which the contact is released from the pressure of the holding link and separated from the fixed contact, the intermediate link is formed in a U-shape and is connected to sandwich the handle; A circuit characterized in that a tension spring is provided between the intermediate side of the intermediate link shaped like the shape and the frame to maintain the shortest distance when the handle is held at an intermediate position between the open and closed positions during tripping. Or disconnection. 2. The frame is provided with a protrusion corresponding to the other end of the presser link, and when the handle is operated from the trip position to the open position, the presser link contacts the protrusion and rotates around the protrusion. A circuit breaker according to claim 1, which is relatable to a catch. 3. The circuit breaker and circuit breaker according to claim 2 of the utility model registration, characterized in that the frame side of the tension spring is hung on a protrusion of the frame.