JP5800359B2 - Distribution board - Google Patents

Description

The present invention relates to the mounting of a circuit breaker incorporated in a distribution board to the bottom of the circuit board, and more particularly to a mounting structure capable of preventing forgetting to fix the circuit breaker to the bottom of the circuit board as much as possible.

The distribution board incorporates internal equipment such as a main switch, a bus connected to the secondary side of the main switch, and a branch switch connected to the bus in the cabinet. It is used as a service entrance device for electric circuits. In the case of a house, the applied electric circuit is usually an AC 50 Hz or 60 Hz single-phase two-wire electric circuit (100 V) or a single-phase three-wire electric circuit (100/200 V).

The cabinet constitutes the outline of the distribution board, and generally, a box that attaches and fixes an insole for mounting the internal device, and forms walls that cover the upper, lower, left, and right side surfaces and the rear surface of the distribution board, And a cover provided on the front side of the box so as to cover the front side facing the operation side of the internal device.

Internal devices such as circuit breakers such as main switches and branch switches incorporated in such distribution boards are used with the internal device main body attached to the bottom, and are fixed to the circuit breaker, or Attachment fixing release means for releasing the attachment is provided. FIG. 1 of Patent Document 1 shows a structure in which a circuit breaker is attached to and detached from a mounting plate that is an insole.

According to this structure, the circuit breaker is attached to and detached from the attachment plate as follows. The locking portion 703 of the lock lever 7 that is a means for fixing and releasing the attachment to the middle bottom of the circuit breaker 1 is set so as not to protrude from the bottom surface of the circuit breaker, and is blocked between the protrusions a9 and b10 of the mounting plate. It is placed on the mounting plate so that the device comes and the 4 claw portions b come to the opening of the recess portion 6 of the circuit breaker. At this time, the claw portions 3 and 4 and the recesses 5 and 6 of the circuit breaker are not engaged with each other. Next, when the circuit breaker 1 is slid in the direction of the buses 11 and 12, the buses 11 and 12 are inserted into the plug-in terminal fittings 15 and 16, and the claw portion 3 and the claw portion 4 provided on the mounting plate. Engages with the recess 5 and the recess 6 of the circuit breaker, respectively. The lock lever 7 can be operated with the finger hook portion 702 selectively at the upper end portion and the lower end portion of the frame portion 701 so that the locking portion 703 protrudes or does not protrude from the bottom surface.

In this state, the circuit breaker is restricted from moving in the upward direction (vertical direction with respect to the mounting plate) in FIG. It can be removed in the load side direction).

Next, when the finger hooking portion 702 of the lock lever 7 is pressed in the direction of the mounting plate with a finger, the locking portion 703 protrudes from the bottom surface of the circuit breaker and is fitted into the fitting portion 8 of the mounting plate. Thereby, the movement of the direction which removes a circuit breaker from a bus-bar can be controlled, and the circuit breaker 1 will be in the state where attachment to the attachment board 2 was completed.

When removing the circuit breaker 1 from the mounting plate 2, the finger hooking portion 702 of the lock lever 7 is pulled up with the finger in the direction opposite to the mounting plate, and the fitting portion 8 and the locking portion 703 of the lock lever 7 are fitted. Is released. Next, the circuit breaker 1 is moved so as to be pulled out in the direction opposite to the bus bars 11 and 12, so that the fitting of the claw part 3 and the claw part 4 with the recessed part 5 and the recessed part 6 is released. In this state, the circuit breaker 1 can be removed from the mounting plate 2 by lifting it from the mounting plate.

In such a circuit breaker mounting structure, in order to mount the plug-in type circuit breaker 1 on the mounting plate 2 provided on the distribution board, a claw portion that restricts the movement in the direction perpendicular to the mounting plate 2 3 and the claw part 4 are provided on the mounting plate 2, and the concave part 5 and the concave part 6 respectively corresponding to the claw parts 3 and 4 are provided in the circuit breaker 1, and the circuit is interrupted from the buses 11 and 12 provided on the mounting plate 2. The circuit breaker 1 is provided with a lock lever 7 that restricts the movement in the direction in which the device 1 is removed, and the fitting plate 8 is provided with a fitting portion 8 into which the locking portion 703 of the lock lever 7 is fitted. The plug-in type circuit breaker can be mounted while sliding parallel to the mounting plate, and even when the electric wire is routed in the distribution board, the finger hook of the lock lever 7 is slightly from the load side surface of the circuit breaker. Since it only protrudes, there is no fear of damaging the wire coating. It is another object of the present invention to provide an attachment structure that does not require the use of a tool for removing the circuit breaker and does not require the carrying of the tool.

JP 2002-150911 A

Nowadays, efforts for product safety have become more important than ever. Circuit breakers and distribution boards that incorporate circuit breakers have the role of supplying electricity supplied by the power company to each branch circuit, while circuit breakers are a security that protects wiring from electrical accidents. Therefore, it is necessary to use it properly attached to the distribution board.

When checking whether or not the circuit breaker is correctly attached to the mounting plate of the distribution board, open the front cover that constitutes the distribution board and check the contact state between the circuit breaker and the bus bar. In addition to visually checking whether or not the circuit breakers are properly arranged, whether or not the above-mentioned lock lever is properly pressed in the direction of the mounting plate is checked visually.

However, since the lock lever is located near the bottom of the circuit breaker and near the bottom of the circuit breaker, and is located on the bottom side of the wire breaker hole in the circuit breaker, when checking the pushed-down state of the lock lever, Prior to factory shipment, it was necessary to sequentially check the inside of the case where the mounting plate was placed on the distribution board, and it took time for the confirmation work.

Also, at the site where the distribution board is installed, when confirming before wiring the wire to the circuit breaker, check the inside of the case as well, but check again after wiring. When the cable is wired, the wired wire will obstruct the visual confirmation of the push-down state of the lock lever, and it will be difficult to confirm the lock lever. That is, when the circuit breaker is not used properly, it is necessary to access the lock lever after scraping the wires and push the lock lever down to the mounting plate. For this reason, it took time for the attachment confirmation work and the correction work.

If you forget to push down the lock lever when installing a circuit breaker or replacing it with one with a different rated voltage at the distribution board construction site, the circuit breaker However, the circuit breaker is not released from the busbar and may be disconnected from the busbar. is there.

Confirmation work after replacement work is performed, but if the lock lever is not pushed down and the cable is connected to the load side terminal and started to use, the use and vibration over time As a result, the circuit breaker may be disconnected from or disconnected from the busbar, resulting in various electrical failures such as poor contact between the busbar and the terminal, abnormal heat generation at the terminal, and power failure. There is.

Therefore, the present invention has been made in view of the above problems, and when the distribution board is installed or the circuit breaker is replaced, the position of the lock lever as the mounting / fixing release means should be fixed. Even if it is not in position, by finally attaching the cover of the distribution board to the box, the distribution lever can be displaced to the fixed mounting position and the circuit breaker can be securely fixed to the insole. Moreover, it aims at providing the distribution board which can maintain the state displaced to the attachment fixing position continuously.

The distribution board according to the present invention is configured to solve the above-described problems.In the cabinet consisting of a box opened at the front and a cover attached to the box and covering the front side of the box, A distribution board in which an attached branch switch is disposed,
On the branch switch, the branch switch is attached and fixed by being locked to a locking portion provided on the midsole,
A lock lever is provided to release the attachment by releasing the engagement with the engagement portion,
When the lock lever is in the mounting release position, it comes into contact with the back of the cover when the cover is attached to the box.
The distribution board may be configured such that the lock lever is displaced from the attachment release position to the attachment fixing position.

According to such a configuration, even when the lock lever that is the mounting / fixing release means is not in the mounting / fixing position, the lock lever is displaced from the mounting / releasing position to the mounting / fixing position by contacting the back surface of the cover with the locking lever. Therefore, the circuit breaker can be securely attached and fixed to the insole.

In the distribution board according to the present invention, the lock lever is
Provided slidably between the mounting release position and the mounting fixing position,
When the cover is pressed in the direction of the box when attaching the cover to the box,
The lock lever in the mounting release position is in contact with the back surface of the cover,
A circuit breaker safety device may be configured to slide to the mounting and fixing position.

According to such a configuration, when the cover is attached to the box, the lock lever is in contact with the back surface of the cover and receives a force for pressing the cover in the direction of the box, and is slidably displaced to the attachment fixing position. Even if you forget to set the lever to the mounting and fixing position, when using the distribution board, the cover is automatically displaced to the mounting and fixing position by attaching the cover to the box. Can be securely attached to the bottom.

Further, in the distribution board according to the present invention, the distance between the back side of the cover and the lock lever when the cover is attached to the box is:
The safety device of the circuit breaker may be configured by the fact that the lock lever is provided smaller than a displacement amount that slides and displaces between the attachment release position and the attachment fixing position.

According to this configuration, after the cover is attached to the box, the lock lever is prevented from being displaced from the attachment fixing position to the attachment releasing position due to aging use, vibration, etc. The state of being attached and fixed to can be maintained over time.

As described above, according to the present invention, even when the position of the lock lever, which is the mounting / fixing release means, is not in the mounting / fixing position when the distribution board is installed or the circuit breaker is replaced, etc. By attaching the cover of the distribution board to the box, it is possible to provide a distribution board in which the lock lever can be displaced to the attachment fixing position and the circuit breaker can be reliably fixed to the insole. Moreover, when using the distribution board, it is possible to provide a distribution board capable of continuously maintaining the state of being displaced to the mounting and fixing position.

The perspective view which shows embodiment of this invention is shown. The figure which looked at the circuit breaker of this invention from the back side is shown. The figure which looked at the circuit breaker of this invention from the bottom face side is shown. The principal part sectional drawing of the circuit breaker of this invention is shown. The state figure in case a lock lever exists in a mounting release position is shown. The principal part sectional view when closing the cover of the distribution board of the present invention is shown. The perspective view when closing the cover of the distribution board of this invention is shown. The perspective view when the cover of the distribution board of this invention is closed is shown. The principal part sectional drawing when the cover of the distribution board of this invention is closed is shown.

Next, a preferred embodiment of the present invention will be described in detail with reference to a mounting structure of a branch switch attached to a residential distribution board.

(First embodiment)
The distribution board 21 according to the first embodiment is used for a single-phase three-wire commercial electric circuit. The distribution board includes a current limiter, a main switch, a bus connected via a connecting member on the secondary side of the main switch, a branch switch 1 connected to the bus, etc. These internal devices are attached to the insole and fixed to the cabinet.

The cabinet constitutes an outline of the distribution board 21. The cabinet includes a box 201 that is fixedly attached to an inner bottom for mounting the internal device and forms a wall that covers the upper, lower, left, and right side surfaces and the rear surface of the distribution board, and the front side facing the operation surface side of the internal device. 211 and a cover 212 provided on the front side. In addition, the distribution board provided with the door is provided on the front side of the cover 212 so as to be able to open and close with a hinge structure so as to cover the front surface of the cover 212 with the door closed. A door is provided.

FIG. 1 is a diagram showing a circuit breaker 1 as a branch switch, an attachment unit 2 to which the circuit breaker 1 is attached, an internal unit including a bus bar of each phase, an insulating wall, and the like.

The circuit breaker 1 will be described on the assumption that the power supply side terminal side is the front side, the load side terminal side is the back side, the side where the operation handle 103 is provided is the front side, and the side attached to the mounting plate described later is the bottom side.

The circuit breaker 1 is formed by casings 101 and 102 in which the outer shell of the main body is divided in the longitudinal direction. The circuit breaker 1 includes a power supply side connection terminal connected to a power supply, a contact connected to the power supply connection terminal, a contact open / close mechanism for opening / closing the contact, and a contact open / close mechanism when an abnormal current is generated. An automatic shut-off mechanism for turning on and off, a load side connection terminal for supplying power to the load side circuit, and the like are provided inside the case, and an operation handle 103 for turning on and off the contact opening / closing mechanism from the outside of the case Is provided on the front side. An electric wire insertion hole for connecting an electric wire to the load side terminal is provided on the load side. The power supply side connection terminal is configured by using a plug-in type terminal, and the load side connection terminal is configured by using a lock connection terminal. On the load side, a lock lever 104 is provided that is locked to a locking portion provided on a mounting plate that is an insole.

The lock lever 104 is provided so that it can alternatively be selected from projecting from the bottom surface of the circuit breaker 1 by the external knob 1042, and is formed in a substantially rod shape that continues from the bottom surface side to the front surface side of the circuit breaker 1. Has been.

The mounting plate, which is an insole, is used to attach internal devices such as a circuit breaker and buses 201, 202, and 203 that supply power to the internal devices.

The mounting plate 2 has first restricting portions 204 and 205 that interact with the circuit breaker when the circuit breaker 1 is attached and restrict the movement of the circuit breaker in the insole direction from the front side to the bottom side. A second restricting portion 206 that restricts the movement in the direction from the front side to the back side is provided.

The first restricting portion 204 is formed by cutting and raising a part of the mounting plate 2, and the end portion is an engagement piece. On the circuit breaker 1 side, as shown in FIG. 3, the concave portion 107 in which the first restricting portion is fitted on the bottom surface of the circuit breaker 1 and the bottom surface side of the concave portion are provided to act on the engagement piece. A mating engagement piece 108 is provided. When the circuit breaker 1 is attached to the mounting plate 2, the engagement pieces engage with each other, thereby restricting the movement in the direction from the front side to the bottom side on the back side of the circuit breaker.

The first restricting portion 205 is formed to protrude from the mounting plate, and a recess (not shown) into which the protruding portion of the second restricting portion 205 formed on the front side of the circuit breaker 1 is fitted. Fit together. By engaging these protrusions and recesses, the movement in the direction from the front side to the bottom side is restricted on the front side of the circuit breaker. Since the movement in the direction from the front side to the bottom side is restricted on both the front side and the back side of the circuit breaker in this way, the circuit breaker can be more reliably fixed to the mounting plate.

Next, the second restricting portion 206 is formed by bending a part of the mounting plate 2 into a concave shape and forming a locking portion by the concave portion. On the back side of the circuit breaker 1, a lock lever 104 is provided which projects from the bottom surface of the circuit breaker 1 to selectively select whether or not by an external knob 1042, and protrudes from the bottom surface of the circuit breaker 1. The lock lever locking portion 1041 fits into the concave portion of the second restricting portion 206 and is engaged with each other, thereby restricting the movement of the circuit breaker in the front side-back side direction.

When the circuit breaker 1 is attached to the mounting plate 2, the circuit breaker 1 is slid in the direction of the bus on the mounting plate 2, so that the bus is inserted into the power supply side terminal and the first The circuit breaker 1 is placed at an appropriate position on the mounting plate 2 by engaging the restricting portions 204 and 205 with the engaging piece 108 of the circuit breaker 1 and the recess. Then, by pushing down the external knob 1042 of the lock lever 104 in the direction of the mounting plate 2, the locking portion 1041 of the lock lever protrudes from the bottom surface of the circuit breaker 1 and engages with the concave portion 206 of the mounting plate 2, Installation is complete.

When removing the circuit breaker 1 from the mounting plate 2, the external knob 1042 of the lock lever 104 is pulled up in the direction opposite to the mounting plate (front side of the circuit breaker 1), and the locking lever locking portion 1041 is removed from the bottom surface. By moving the circuit breaker 1 so as not to protrude and pulling the circuit breaker 1 back, the engagement between the first restricting portions 104 and 205 and the circuit breaker is released, and at the same time the connection between the bus bar and the connection terminal is released. The removal is completed.

Further, as shown in FIG. 4, the lock lever 104 is elastically formed so that the position of the lock lever 104 protruding from the bottom surface of the circuit breaker 1 and the position of the lock lever 104 are not determined. Arm portions 1046 are formed, and climbing protrusions 1012 and 1022 that slide with the elastic arm portions are formed inside the casings 101 and 102 on the back surface-bottom surface side. When the lock lever is pushed down in the direction of the mounting plate and pulled up to the front side by operating the external knob 1042 of the lock lever, the elastic arm portion is bent over the protrusions 1012, 1022 while being bent. Is alternatively determined and the position is maintained.

Due to such a configuration, when the lock lever is pushed down in the direction of the mounting plate, after the end of the elastic arm portion 1046 reaches the apex of the protrusions 1012, 1022, a scissors are attached to a predetermined fixed position. Displace. Also, when the lock lever 104 is pulled up, after the end of the elastic arm portion 1046 has reached the top of the protrusions 1012, 1022, it is displaced to a predetermined release position.

Further, the locking portion 1041 of the lock lever is formed with a trapezoid climbing protrusion 1047 whose bottom surface is inclined with respect to the mounting plate. When the circuit breaker is to be placed on the mounting plate 2, for example, when the circuit breaker is slid in the direction of the bus bar while the lock lever 1041 is protruding from the bottom surface of the circuit breaker, the slope becomes the mounting plate. 2 is converted into a force for pushing the lock lever 104 to the front side, and the lock lever 104 is pushed to the front side. At this time, if the positional relationship is such that the elastic arm portion 1046 does not get over the protrusion protrusions 1012, 1022, the circuit breaker 1 slides, and the lock lever 1041 is inserted into the recess fitting portion of the mounting plate 2. When there is a force, the force pushed up to the front side disappears, and the force that the elastic arm portion 1046 tries to return to the original protruding state works, and the locking portion 1041 of the lock lever protrudes from the bottom surface of the circuit breaker 1, Installation is completed without having to push down the knob.

A sliding portion is formed in the extending portion 1043 on the front side of the lock lever 104 by digging a part of the meat of the extending portion. The sliding portion serves as a guide.

The sliding portion is slidably supported on the inside of the support portion by cylindrical support portions 1012, 1022 provided on the housing.

Next, the positional relationship between the lock lever 104 and the cover 212 formed in the substantially rod shape will be described. FIG. 10 shows a state where the lock lever 104 is in the mounting and fixing position. At this time, the gap between the front side of the lock lever 104 and the back side of the cover 212 of the distribution board is configured to be small.

Specifically, the locking lever locking portion 1041 is provided so as not to be released from the recess locking portion 206 of the mounting plate 2. In other words, the above-described elastic arm portion 1046 of the lock lever 104 is provided so as not to exceed the overhanging protrusions 1012, 1022, and the lock lever 104 is released when the cover 212 is closed. Is configured to not.
That is, the gap between the front surface side of the lock lever 104 and the rear surface side of the cover 212 of the distribution board is provided smaller than the displacement amount at which the lock lever 104 slides between the mounting release position and the mounting fixing position. .

Here, FIG. 5 shows a state when the lock lever 104 is in the attachment release position. A case where the cover 212 is attached to the box 211 in this state will be described. When the cover 212 is gradually closed as shown in FIGS. 6A and 6B and FIG. 7, the back side of the cover 212 approaches the front side of the lock lever 104, and finally the back side of the cover 212 is locked with the back side. The front side of the lever 104 comes into contact, and the lock lever 104 is pushed down by the cover 212.

When the cover 212 is completely closed, as shown in FIGS. 10 and 8, the lock lever 104 is displaced to the attachment fixing position.

As described above, when the lock lever 104 is in the attachment release position, by performing the operation of closing the cover 212, the lock lever 104 is displaced to the attachment fixing position, and the circuit breaker 1 is reliably attached to the attachment plate 2. . Further, the clearance between the front side of the lock lever 104 and the rear side of the cover 212 of the distribution board is provided smaller than the displacement amount at which the lock lever 104 slides between the mounting release position and the mounting fixing position. Therefore, the lock lever 104 is not released when the cover 212 is completely closed.

Next, when the circuit breaker 1 is attached to the attachment plate 2, it is attached in the following steps.
The circuit breaker 1 is placed on the mounting plate 2 and is slid to the bus bar side, and the first restricting portions 204 and 205 and the engagement piece 108 are engaged (step 1). In this state, the mounting position of the circuit breaker is an appropriate position with respect to the mounting plate.

Subsequently, the external knob 1042 of the lock lever 1041 is pushed down in the direction of the mounting plate, and the lock lever 1041 is protruded from the bottom surface (step 2). As described above, the attachment of the circuit breaker to the attachment plate is completed.

If a plurality of circuit breakers 1 are arranged side by side on the mounting plate 1, if there is something that has been installed in the same way as in step 1, it is necessary to check it before shipping or during construction. By opening the cover of the electrical panel and performing visual confirmation from the front side, it is possible to easily recognize that there is a circuit breaker that is not properly attached because the lock lever 104 extends to the front side. That is, when the display unit 1044 protrudes to the outer front side of the housing, it can be easily recognized that the lock lever is not pushed down.

In this state, when the lock lever is pushed down to perform step 2, the extension 1043 can be pushed to transmit a force to the lock lever 104, and the lock lever can be pushed down. . In particular, after completing the on-site wiring work, if there is something that has been installed in step 1 without having to scrape the wiring, it is not necessary to push down the external knob 1042 of the lock lever 104. In addition to ensuring safety, improvement in convenience during construction can be expected.

The extending portion 1043 is formed in a substantially triangular shape that narrows from the front side to the back side. This makes it easier to guide the electric wire into the electric wire insertion hole when the electric wire is inserted into the electric wire insertion holes 105 and 106 on the load side. Moreover, it also has an effect | action as an insulating wall for making it difficult to contact the electric wires inserted in each electric wire insertion hole.

Unless the direction in which the circuit breaker is removed from the busbar is not released, the circuit breaker 1 is not released from the vertical and lateral restrictions on the mounting plate 2, and the circuit breaker 1 is removed from the busbar from the mounting plate 2. There is no possibility that various electrical failures such as contact failure between the busbar and the terminal, abnormal heat generation of the terminal portion, occurrence of power failure, etc. occur.

The display unit 1044 and the pressing unit 1045 in the safety device may be configured by forming a second external knob 1049 that is partially bent. Thereby, in addition to pushing down the lock lever 7 from the front side of the circuit breaker 1, it is also possible to perform an operation of pulling up, and further improvement in convenience when the circuit breaker 1 is attached and detached can be expected.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 101 Case 102 Case 1012 Support part 1022 Support part 104 Lock lever 1041 Lock lever latching part 1042 External knob 1043 Extension part 1046 Elastic arm part 1047 Trapezoid climbing protrusion 105 Electric wire insertion hole 106 Electric wire insertion hole 107 recess 108 engagement portion 2 mounting plate 201 bus 202 bus 203 bus 204 first restricting portion 205 first restricting portion 206 second restricting portion 21 distribution board 211 cover 212 box

Claims (3)

A distribution board in which a branch switch attached to an insole is disposed inside a cabinet composed of a box opened at the front and a cover attached to the box and covering the front side of the box,
On the branch switch, the branch switch is attached and fixed by being locked to a locking portion provided on the midsole,
A lock lever is provided to release the attachment by releasing the engagement with the engagement portion,
When the lock lever is in the mounting release position, it comes into contact with the back of the cover when the cover is attached to the box.
A distribution board characterized in that the lock lever is displaced from a mounting release position to a mounting fixing position.
The lock lever is
Provided slidably between the mounting release position and the mounting fixing position,
When the cover is pressed in the direction of the box when attaching the cover to the box,
The lock lever in the mounting release position is in contact with the back surface of the cover,
2. The distribution board according to claim 1, wherein the distribution board is slid and moved to an attachment fixing position.
The distance between the back side of the cover and the lock lever when the cover is attached to the box is
The distribution board according to claim 2, wherein the lock lever is provided smaller than a displacement amount of sliding displacement between the attachment release position and the attachment fixing position.

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