JPS6322008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display button structure for an electromagnetic switch used, for example, in an earth leakage breaker.

Conventional earth leakage breakers have an indicator button that detects earth leakage and displays the abnormal state, and a button that opens and closes the opening/closing mechanism by creating a current leakage state in the earth leakage breaker and tripping the opening/closing mechanism consisting of fixed contacts and movable contacts. Two types of buttons were provided: a test button for checking the mechanical parts and a test button for testing. Figure 1 shows the structure of a display button 6' that indicates that there is a current leakage in a conventional earth leakage breaker.
Reference numeral 10 denotes a display window bored in the cover 11, and a display button 6' is disposed within the display window 10 so as to be movable up and down. A space 13 is formed inside the display button 6', and a spring 14 is provided within this space 13 to spring the display button 6' upward. The lower end of the spring 14 is brought into contact with the lower surface of the button 6'.
The locking piece 15 is brought into contact with the locking piece 15 protruding into the inside of the locking piece 3. Reference numeral 9 denotes an armature that is attracted and driven by an electromagnetic device that detects and drives electrical leakage, and an engagement protrusion 17 that can be freely engaged with an engagement hole 16 bored in this armature 9 is provided protruding from the lower part of the display button 6'. Furthermore, the armature 9 is biased by a spring 18 so that the engagement protrusion 17 and the engagement hole 16 are maintained in an engaged state. 1
Reference numeral 9 denotes a tripping plate whose lower end is pivoted. When an abnormality occurs, an amachia 9 attracted and driven by an electromagnetic device comes into contact with this tripping plate 19, driving the tripping plate 19 and causing a trip operation, which causes a fixed contact and a movable contact to be connected. It makes them separate. At the same time, as shown in Figure 1b,
The engagement hole 16 of the armature 9 and the engagement protrusion 17 of the display button 6' are disengaged, and the display button 6' is projected upward by the spring 14 to indicate an abnormal state. On the other hand, a test button for intentionally creating an abnormal state is formed on the cover 11 separately from the display button 6'. In this way, test button and display button 6'
Since the two types of buttons are formed, if the size of the product becomes smaller, the cover 11 can be used for space reasons.
It is very difficult to place two buttons side by side on the top.
Another problem was that the cost increased due to the increased number of parts.

The present invention has been provided in view of the above-mentioned points, and provides a display button structure for an electromagnetic switch in which a single button has two functions: a test button for testing and a display button for displaying abnormal conditions. The purpose is to provide

Embodiments of the present invention will be described in detail below with reference to the drawings.
The basic opening/closing mechanism and tripping operation are the same as those of the conventional example. FIG. 6 shows the earth leakage breaker of this embodiment, where 27 is an operating handle and 28 is a terminal plate. FIG. 2 shows an exploded perspective view of the drive mechanism of the display button 6, the electromagnet device 8, and the leakage detection mechanism, and the opening/closing mechanism portion having other fixed contacts and movable contacts is omitted. In the figure, 48 is an endless annular zero-phase current transformer through which the detection wire is passed, and 49 is its hole.If the detection wire becomes unbalanced due to a current leakage, if this detection wire is used as the primary, the secondary output will be output on the secondary side. is induced. 50 is the secondary output lead wire, and 51 is an amplifier for amplifying the secondary output, which encapsulates the components with a filler such as epoxy. Reference numeral 8 denotes an electromagnetic device, which consists of a coil 53, a winding frame 54, a yoke 55, and an armature 9, and the three components 8, 51, and 52 are integrated so as to be located between the zero-phase current transformer 48 and the amplifier 51. It is housed in a common box 57 made of synthetic resin and is fixed as a block on the table. In other words, this common box 57 has an opening on the table side, and is open to the three parties 48,
Both 51 and 52 are installed and fixed through this opening. To specifically explain the electromagnet device 8, the yoke 55 includes a top plate 66, a hanging plate 67, and this hanging plate 6.
A fixing plate 68 that sits on the container stand is bent from 7 and formed integrally. A fixed iron core 69 hangs down from the top plate 66 and is inserted into the winding frame 54 and also serves as a rivet for the winding frame 54. The armature 9 has one end 9a corresponding to the fixed iron core 69 and the other end 9b extending beyond the horizontal hole 70 of the common box 57 and corresponding to the tripping plate 19. Therefore, when the armature 9 is attracted, the other end 9b hits the tripping plate 19. Reference numeral 71 designates a narrow neck portion provided in the middle of this armature 9, and is formed with notches 71a provided on both sides. The hanging plate 67 of the yoke 55 is provided with a square hole 72 having a wide cut 72a and a narrow back 72b.
There is an elongated protrusion 72c on the a side. After the neck 71 of the amachia 9 is inserted through this cut 72a, the elongated protrusion 72c is inserted so as to close the cut 72a.
is bent and the armature 9 is pivotally supported in the square hole 72. Reference numeral 12 denotes a mounting portion for the display button 6 formed on the outside of the inner chamber 63 of the peripheral wall 58 of the common box 57. The display button 6 is attached to the mounting portion 12 so as to protrude from the display window 10 of the cover 11 with a movable contact plate 7, which will be described later. The projection 6a of the display button 6 is removably engaged with the engagement hole 16 provided at the other end 9b of the armature 9, and the display button 6 is disengaged from the armature 9. At this time, the tip of the display button 6 protrudes from a display window 10 provided in the cover 11 to notify the cut-off state due to the detection of electric leakage. Also York 5
A bent portion 101 is formed on the hanging plate 67 of No. 5, and a coil spring 102 is disposed between the bent portion 101 and the other end 9b of the armature 9 to bias the armature 9. Reference numeral 77 denotes a screw hole provided in the fixing plate 68 of the yoke 55, into which a screw passing through the pedestal is screwed to fix the electromagnet device 8 to the pedestal. By pouring it in and fixing the yoke 55, the amplifier 51 and the zero-phase current transformer 48
It also serves to fix the common box 57 including the. The side wall 60 of the common box 57 is further provided with upper and lower recesses 79 and 80 for the electromagnet device 8 and the zero-phase current transformer 4.
8, and 81 is a partition wall thereof. Further, a long vertical recess 82 extending to the upper recess 79 is formed on one side of the lower recess 80 .
A movable contact plate 7 for a test switch is arranged in the upper recess 79, and a tongue piece 84a is press-fitted into a small hole 79a of the upper recess 79 and locked therein. 5 is a fixed contact plate,
Located in the vertical recess 82, the small hole 82 of this vertical recess 82
The tongue piece 85a is press-fitted and locked. Therefore, when the movable contact plate 7 is pressed and comes into contact with the fixed contact plate 5, the detection lines become unbalanced, causing the same phenomenon as an electric leak. Reference numeral 86 is a sensitivity adjustment resistor, and the value of this resistor 86 is used to select a certain range, such as operating at 5 mmA or 20 mmA, for example, in order to standardize the types. Of course, the amplifier 51 and the zero-phase current transformer 4
8. It is also used to correct manufacturing errors such as the electromagnet device 8. As shown in FIG. 3, the tip of the movable contact plate 7 is locked to the locking portion 23 of the display button 6, and the spring force of the movable contact plate 7 causes the display button 6 to spring upwards on the cover 11. There is. Reference numeral 24 denotes a terminal plate to which the fixed contact 1 is fixed, and this terminal plate 24 is attached to the device stand. Reference numeral 3 denotes a contact plate to which a movable contact 2 is fixed, and this contact plate 3 is moved up and down by an insulating plate 4 driven by an operating handle 27, so that both contacts 1 and 2 can be separated and separated. Normally, a load current is passed through this opening/closing mechanism section A, and both contacts 1 and 2 are opened in the event of an abnormality such as leakage or overload current. Reference numeral 25 denotes a reset pin protruding from the lower part of the display button 6. The tip of this pin 25 hooks and engages with the engaging portion 26 of the insulating plate 4, and the insulating plate 4 moves downward to the contact plate. When pressing 3 to close both contacts 1 and 2 and normally on, pin 25 of display button 6 is pushed downward, so display button 6
The tip of the cover 11 is designed not to protrude above the cover 11. This pin 25 constitutes a reset member that returns the display button 6 to a reset state from an abnormality as will be described later.

Next, the operation will be explained. FIG. 3 shows a state in which the fixed contact 1 and the movable contact 2 are closed in the normal state, and in this state, the movable contact plate 7 and the fixed contact plate 5 for testing are in the open state, and the display The button 6 is held by the engaging portion 26 of the insulating plate 4 and the pin 25 so that it does not protrude beyond the display window 10 of the cover 11. FIG. 4 shows an electric current leakage, in which the electromagnet device 8 operates via the zero-phase current transformer 48, and the armature 9 is attracted to the electromagnet device 8 using the support portion of the yoke 55 (A in the figure) as a fulcrum. At the same time, the armature 9 pushes the tripping plate 19 to perform a tripping operation, thereby opening the fixed contact 1 and the movable contact 2. When the armature 9 operates, the insulating plate 4 rises and the engagement hole 16 of the armature 9 disengages from the protrusion 6a of the display button 6, and the spring force of the movable contact plate 7 for testing causes the display button 6 to be pressed. protrudes from the top surface of the cover 11 to indicate a current leakage. In order to reset the display button 6, the insulating plate 4 is lowered by turning on the operating handle 27, and the protrusion 6a of the display button 6 engages with the engagement hole 16 of the armature 9, completing the reset. FIG. 5 shows the test operation state. To perform the test operation, move the movable contact plate 7 and the fixed contact plate 5 by pushing the display button 6 from the state shown in FIG. 3 to the state shown in FIG. Activate the test circuit by making contact,
As described above, the operation of the electromagnet device 8 causes the fixed contact 1 and the movable contact 2 to be separated. In addition, display button 6
In order to clearly distinguish between the normal state and the abnormal display state, in the normal state, the tip surface (top surface) of the display button 6 is flush with the top surface of the cover 11, or is slightly protruding to be distinguishable from the display state. Then, a test check is made possible by pressing with a screwdriver or the like, and when the display button 6 protrudes in the display state, for example, the color of the side surface below the top surface of the display button 6 is changed to the color of the top surface for identification. I'm trying to make it easier. Here, as mentioned above, when returning the display button 6 from an abnormality such as electric leakage or during a test, instead of pushing the display button 6,
By operating the operation handle 27, the insulating plate 4 is lowered, and the display button 6 is pushed down by the pin 25 engaged with the insulating plate 4. this is,
When the display button 6 is pressed, the movable contact piece 7 for testing
This is because there is a possibility that the fixed contact piece 5 may come into contact with the fixed contact piece 5, causing an inconvenience. Of course, the present invention can also be applied to general electromagnetic switches other than earth leakage breakers.

As described above, the present invention provides an opening/closing mechanism that moves up and down a contact plate that allows a fixed contact and a movable contact to be separated and separated in the event of an abnormality such as overcurrent or leakage, or when disconnection occurs. , a fixed contact plate for testing to test abnormal conditions, a movable contact plate for testing installed opposite to this fixed contact plate and connected to a display button, an electromagnetic device that operates in the event of an abnormality and during testing, and this electromagnet. The display button is equipped with an armature driven by the device and a reset member that resets the display button when the insulating plate is driven by the operation handle in the direction of closing the fixed contact and the movable contact, and can be freely engaged with the armature. are separated by an armature driven by an electromagnetic device when testing or abnormal conditions, and the spring force of the movable contact plate springs the display button to display the display, so there is no leakage or overcurrent. In the event of an abnormality such as this, the armature, which is attracted and driven by an electromagnetic device, is disengaged from the display button, and the display button is made to protrude by the spring force of the movable contact plate, and at the same time, the fixed contact and the movable contact are opened. By pressing the display button, the movable contact plate and the fixed contact plate are brought into contact and the electromagnetic device is driven, thereby driving the armature to perform a tripping operation and separating the fixed contact and the movable contact. This allows for a single display button instead of two buttons, one for testing and one for displaying abnormalities, as in the past.This allows the product to be manufactured compactly and is compact. It is possible to provide two functions for testing and display, and furthermore, the cost can be reduced because the number of parts is reduced, and since there is only one button, there are no mistakes in operation. In addition, if the display button is to be reset after the tripping operation, a reset member is provided that resets the display button when the insulating plate is driven by the operating handle in the direction that closes the fixed contact and the movable contact. Therefore, by operating the operation handle, the display button is pushed down and reset via the insulating plate and the reset member. Therefore, when resetting the display button, only the operation of the operation handle is necessary. Furthermore, when the display button is pushed in to reset, there is a risk that the movable contact plate and the fixed contact plate may come into contact with each other, so there is no need to consider measures to prevent such contact, and the overall configuration is simple. Therefore, it is possible to provide a display button for testing and in case of an abnormality.

[Brief explanation of drawings]

1A and 1B are sectional views of the conventional example, FIG. 2 is an exploded perspective view of essential parts of the embodiment of the present invention, FIGS. 3 to 5 are explanatory views of the same operation, and FIGS. 6A and 6B are are a plan view and a side view of the same earth leakage breaker as above, 1 is a fixed contact, 2 is a movable contact, 3 is a contact plate, 4 is an insulating plate, 5
is a fixed contact plate, 6 is a display button, 7 is a movable contact plate, 8
is an electromagnetic device, and 9 is an amateur.

Claims (1)

[Claims] 1. In the event of an abnormality such as overcurrent or leakage or interruption, the contact plate, which allows the fixed contact and movable contact to be separated and separated, is moved up and down, and the opening/closing mechanism section, which has an insulating plate linked to the operating handle, is tested for abnormal conditions. A fixed contact plate for testing, a movable contact plate for testing installed opposite to the fixed contact plate and connected to a display button, an electromagnetic device that operates in the event of an abnormality and during testing, and an armature driven by the electromagnetic device. , a reset member that resets the display button when the insulating plate is driven by the operation handle in a direction that closes the fixed contact and the movable contact, and the display button that can be freely engaged with the armature is used for testing abnormal conditions and 1. A display button structure for an electromagnetic switch, characterized in that when an abnormality occurs, an armature driven by an electromagnetic device separates and the display button is activated by the spring force of the movable contact plate to display the display button.