JPH09326572A - Knock-out structure and distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate installation work for a knock-out wiring hole without impairing appearance, by forming grooves on the entire periphery or part of the periphery of the knock-out section of an enclosure inside and outside the enclosure in opposite positions. SOLUTION: A knock-out section 2 is constituted in a buried section 1b that forms part of the side walls of the enclosure of a distribution board. Isolating sections 3, integrated with the base of the buried section 1b, are formed on the left and right of the knock-out section 2 inside the base. The isolating sections 3 function to ensure the strength of the base after the knock-out section 2 is cut out to form a knock-out hole and to divide the knock-out section 2 from the other sections. A slit 4 is formed in a bottom plate 1c under the isolating walls 3 between them in such a manner that the slit 4 penetrates the bottom plate 1c. In order to form the knock-out section 2 in the area defined by the isolating walls 3, grooves 5 are formed inside the base in positions corresponding to the periphery of the knock-out section 2, and further grooves 6 are formed in positions corresponding to the grooves 5 inside the base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knockout structure for a wiring hole formed in a housing of various electric devices and a distribution board equipped with the knockout structure.

[0002]

2. Description of the Related Art There is a distribution board for wiring indoors in a house or the like. As shown in Fig. 7, the distribution board introduces an electric wire drawn from an outdoor power pole through an integrating power meter, etc., and when a large current exceeding the rated current flows for a predetermined time
A master breaker 21 that shuts off the power line when an abnormality such as overvoltage occurs,
A plurality of branch breakers 22 that are connected to the main breaker 21 and are divided into several indoor parts for wiring, and when a large current flows through any of the wires in each part, the circuit breaks in that part. A box-shaped housing 23 for housing the power distribution device including the main breaker 21 and the branch breaker 22 with the breaker opening / closing handles 21a and 22a exposed.

The housing 23 further has a box-shaped base 24 having an open top surface for disposing the power distribution device on a bottom plate, and an openable / closable door 25a. Upper surface (breaker opening / closing handles 21a, 22a
And a cover 25 disposed above the base 24 so as to cover (including).

Conventionally, in such a distribution board for a house, a base 24 of a housing 23 thereof is attached to a wall surface for use, and a part of the base 24 is provided with an electric wire conductor from the outside to a power distribution device. On the other hand, a plurality of knockout portions 26 for introducing or leading out the electric wire conductor from the internal power distribution device to the outside are formed.

Some of the plurality of knockout portions 26 are cut out and opened by using a blade such as a cutter so that a wire conductor can be passed therethrough.

Knockout holes used in such a distribution board are disclosed in Japanese Utility Model Laid-Open No. 2-65012 (Prior Art 1).

In the prior art 1, the wiring knockout portion 26 of the distribution board for a house is provided on the side surface of the housing base 24. The structure of the knockout portion 26 is as shown in FIGS. 8 (a) and 8 (b). A structure in which the outer periphery of the portion 26 is perforated, as shown in FIG.
As shown in (a) to (c), a structure in which a groove 29 is provided on the outer periphery of the knockout portion 26 inside the housing base 24, or as shown in FIGS. 10 (a) and 10 (b), A structure is shown in which a step is provided on the outer side of the knockout portion 26 and the other portion.

In FIG. 8A, the outer periphery of the knockout portion 26 is formed on the side wall of the housing base 24 by a slit 27 and a connecting branch 28 to form a perforation. Figure 8 (b) is
It is the DD sectional view taken on the line of (a).

Further, in FIG. 9A, the housing base 24
The side wall of the side plate 24a and a wall surface fitting portion (hereinafter, referred to as an embedding portion) 24b connected to the side plate 24a,
A V-shaped groove 29 for forming the outer circumference of the knockout portion 26 is formed only inside the embedded portion 24b forming the side wall. A cutout window 30 is formed by cutting out the bottom plate 24c in the lower portion of the knockout portion 26 of the bottom plate 24c. Here, the reason why the groove 29 is formed only on the inner side of the base 24 is to improve the appearance of the outer side of the base, that is, the appearance. 9B is a sectional view taken along the line EE of FIG. 9A, and FIG. 9C is a sectional view taken along the line FF of FIG. 9A.

In FIG. 10 (a), as in FIG. 9 (a),
The side wall of the housing base 24 is composed of a side plate 24a and an embedded portion 24b connected to the side plate 24a. As can be seen from the outside of the embedded portion 24b forming the side wall, a step is formed between the knockout portion 26 and the other portion. Has been formed. By doing so, the outer peripheral portion of the knockout portion 26 is thinly formed. FIG. 10 (b) is shown in FIG.
It is the GG sectional view taken on the line of (a).

The work for providing the knockout wiring hole is as follows.
If the perforated structure has a perforated structure, use a cutter or the like to cut off the portion with the meat, or if there is a groove inside the housing base, cut the meat along the groove. Be seen. In the case of forming the knockout portion of the perforation, if the material of the housing base is a synthetic resin, a molding die using a slide is usually used.

In addition to the above, a knockout portion such as a distribution board is disclosed in Japanese Unexamined Patent Publication No. 6-31520 as a prior art.
No. 9, JP-A-6-315211, and JP-A-7-231518.

In Japanese Patent Laid-Open Publication No. 6-315209, a base end to a tip connected to a bottom plate of the lower box is facilitated so that the work of inserting the wire conductor into the lower box, which is a part of the housing, can be facilitated. There is a description provided with an incoming wire portion (that is, a knockout member) into which an electric wire conductor that is formed to be inclined upward (that is, at an obtuse angle) is provided (Prior Art 2).

In JP-A-6-315211, a knockout portion for introducing or leading an electric wire conductor is provided on a bottom plate of a box body (which is a portion fixed to a wall surface) which is a casing of a distribution board. In this case, when the wire conductor is introduced or led out from the wall into the distribution board housing by making a hole in the wall and removing the knockout part, the knockout part that does not need to be removed is removed to increase the strength of the box. It is described that a groove through which a tip of a writing instrument penetrates is provided in a groove that constitutes a knockout portion provided on a bottom plate so that the wall surface can be marked through the taper so as not to lower it (conventional method). Technology 3).

In Japanese Patent Laid-Open No. 7-231518, knockout holes for metal pipes / synthetic resin pipes and knockout holes for both cable knockout holes are provided on the same surface of a side plate of a box body constituting a casing. It is described that it is formed above (prior art 4).

[0016]

In the prior art 1 described above, when the outer periphery of the knockout portion is perforated, the work of providing the knockout wiring hole is easy, but the design on the appearance is impaired. Also, in the case of perforations, if the housing base is made of synthetic resin, the manufacturing method is often a molding die that uses a slide, which causes a problem that the die cost becomes expensive. It was

If there is a groove for forming a knockout only on the inside of the housing base, it is difficult to cut from the inside.
Further, if a step is provided on the outside of the base between the knockout portion and the other portion, there is a problem that the design of the appearance is impaired.

On the other hand, residential distribution boards are often constructed by exposing them to the wall, and knockouts for wiring holes are used for a while after the construction of residential distribution boards such as the addition of air conditioners. It's often since then. The knockout portion is provided only on one side surface (for example, the upper surface) of the housing base of the distribution board for a house or concentrated on a specific portion. However, when the distribution board is embedded in the wall, it is not possible to limit from which position in the wall the electric wire is routed, depending on the wiring construction method. If there is a knockout portion, wiring has to be performed for the knockout portion located at that location in any case, and there is a problem in that the wiring method is limited and there is no freedom in wiring.

Further, the prior art 2 does not solve the problem of the limitation of the wiring work method and the problem of the difficulty of the cutting work of the knockout portion.

The prior art 3 does not solve the problem of the appearance when the knockout portion is provided on the side surface of the housing, the problem of the limitation of the wiring work method, and the difficulty of the cutting work of the knockout portion. It was

The prior art 4 does not solve the problem of the limitation of the wiring work method and the problem of the work of cutting the knockout portion.

Therefore, according to the present invention, the knockout wiring hole can be easily provided without impairing the appearance of the design, and the wiring / pulling-in from various places can be supported, which is economically advantageous. An object of the present invention is to provide a knockout structure and a distribution board.

[0023]

According to another aspect of the present invention, there is provided a knockout structure in which a groove is formed in a part or all of an outer periphery of a knockout portion of a housing at positions facing each other from the inside and the outside of the housing. It is characterized by that.

In the knockout structure of the present invention as defined in claim 2, a part or all of the outer periphery of the knockout portion of the housing is formed so that the wall thickness is thinned at positions facing each other from the inside and the outside of the housing. Is characterized by.

In the above description, the housing is a cabinet or case of various electric devices, and the material is preferably synthetic resin. The knockout part is for forming a wiring hole for introducing the wire conductor into the housing or for leading the wire conductor out of the housing, and for forming an additional window for the connection terminal. It may be.

A knockout structure according to a third aspect of the present invention includes a housing for accommodating an electric device therein; a wire conductor which is formed on a part of the housing and is introduced into the electric device from outside. A knockout portion for guiding the electric wire conductor from the electric device to the outside, and is formed by providing a groove at a position facing each other from the inside and the outside of the casing, on a part or all of the outer periphery of the knockout portion of the casing. And a knock-out section.

According to a fourth aspect of the present invention, there is provided a knockout structure, which has a housing for housing an electric device therein; and a wire conductor which is formed in a part of the housing and is introduced into the electric device from outside. A knockout portion for guiding the electric wire conductor from an electric device to the outside, and a part or all of the outer periphery of the knockout portion of the housing is thinned at positions facing each other from the inside and the outside of the housing. And a knockout portion formed on the.

In the above description, the electric equipment may be any equipment such as a power distribution equipment that needs to introduce or lead out a wire conductor. The knockout portion is for forming a wiring hole for introducing the wire conductor into the housing or leading the wire conductor out of the housing.

According to a fifth aspect of the present invention, in the knockout structure according to the third or fourth aspect, the electric device is a power distribution device.

Here, the power distribution device is a device for wiring electric wires including a distribution board.

According to a sixth aspect of the present invention, there is provided a distribution board in which a knockout portion is provided in the entire outer circumference of the housing base.

According to a seventh aspect of the present invention, there is provided a distribution board in which a knockout portion is provided in the entire outer peripheral area of an embedded portion of a housing base that is attached and fixed to a wall surface or a wall construction.

According to an eighth aspect of the present invention, in the distribution board according to the sixth or seventh aspect, the knockout portion is the first aspect.
The knockout structure according to any one of items 1 to 5 is characterized.

According to the first aspect of the present invention, grooves are provided from the inside and the outside on a part or all of the outer circumference of the knockout portion of the housing to facilitate the work of providing the knockout holes and to impair the appearance. So that there is no

According to the second aspect of the present invention, a part or all of the outer circumference of the knockout portion of the housing is thinned from the inside and the outside to facilitate the work of providing the knockout hole and to improve the appearance. I tried not to damage it.

According to the third aspect of the present invention, a groove is provided from inside and outside on a part or all of the outer circumference of the knockout portion of the housing to facilitate the work of providing the knockout wiring hole and spoil the appearance. I tried not to.

According to the fourth aspect of the invention, a part or all of the outer periphery of the knockout portion of the housing is thinned from the inside and the outside to facilitate the work of providing the knockout wiring hole and to improve the appearance. I tried not to damage it.

According to the invention of claim 5, claim 3
Alternatively, in the invention described in 4, if the electric device housed in the housing is a power distribution device, the housing housing the electric device is
A wiring hole or a knockout portion for inputting and outputting the electric wire conductor is required.

According to the sixth aspect of the present invention, since the knockout portion is provided in the entire outer periphery of the casing base of the distribution board, when the casing base is attached to the wall surface or the like, the subsequent wiring method is used. Not limited to any position on the distribution board
Even if a wiring hole or a terminal expansion window is needed in the direction, this can be easily accommodated.

According to the seventh aspect of the present invention, since the knockout portion is provided in the entire outer periphery of the wall embedded portion of the housing base, when the housing base is attached to a wall surface or the like, the subsequent wiring method No matter what position and direction of the distribution board the wiring hole or terminal expansion window is required, it is possible to easily cope with this, and the embedded part of the housing base can be embedded in the wall. Since the knockout portion is provided in the wall-embedded portion not only when it is attached to the wall, but also when it is exposed to the wall and attached, there is very little risk of impairing the aesthetic appearance.

In the invention described in claim 8, claim 6 is provided.
Alternatively, in the invention described in 7, when a plurality of knockout portions are formed in the entire outer circumference of the housing base, grooves are provided on the outer circumference of the knockout portion from the inside and the outside, or the wall thickness is reduced from the inside and the outside. In addition to the advantage of the degree of freedom of the position / direction of the knockout hole in the invention according to claim 6 or 7, the work of providing the knockout hole can be facilitated and the aesthetic appearance can be maintained.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a knockout structure according to an embodiment of the present invention. Here, a knockout structure formed on the chassis base of the distribution board will be described. 1 (a) is a perspective view of the knockout portion of the housing base seen from the inside, FIG. 1 (b) is a front view of the knockout portion of FIG. 1 (a) seen from the outside, and FIG. 1 (c) is FIG. (a) A-A
1B is a sectional view taken along line BB in FIG. 1A.

In FIG. 1 (a), the housing base 1 is formed in a substantially box-like shape with an open upper surface side, and the side wall of the base 1 is composed of a side plate 1a and a wall surface-embedding embedding portion 1b connected to the side plate 1a. A bottom plate 1c is formed so as to be connected to the embedded portion 1b. A synthetic resin is used as the material of the housing base 1.

The embedded portion 1b forming a part of the side wall includes
Although the knockout portion 2 is configured, a function of securing the base strength when the knockout portion 2 is cut out inside the base of the embedded portion 1b and a knockout hole is formed, and a function of separating the knockout portion 2 from other portions. Isolation walls 3 that fulfill the above requirements are provided integrally with the base on the left and right of the knockout portion 2. A slit 4 is provided in the bottom plate 1c below the inside of the isolation wall 3 so as to penetrate the bottom plate 1c.
In order to form the knockout part 2 in the part partitioned by the isolation wall 3, a groove 5 is provided from the inside of the base in the part corresponding to the outer periphery of the knockout part 2 as shown in FIG. 1 (a). As shown in FIG. 1B, a groove 6 is provided on the outside of the base at a position corresponding to the groove 5 on the inside of the base.

There are two grooves on the inside of the base, one on the left side and one on the right side. These are connected grooves and the slit 4 on the lower side.
And the outer periphery of the knockout part 2 is formed.
Two grooves 6 on the outside of the base are formed on the left side and the right side in the figure, and are not formed on the upper side for improving the appearance, but it is needless to say that the groove may be formed on the upper side. is there. The grooves 5 and 6 may be V-shaped, U-shaped, or may have a gentle slope.

In the above structure, the grooves 5 and 6 are formed on the outer periphery of the knockout portion 2 of the housing base 1 at positions facing each other from the inside and the outside of the housing base.
The thickness between the outer groove 6 and the inner groove 5 can be reduced from both sides, and when the knockout hole is provided, the knockout hole can be easily formed not only from the outside of the housing but also from the inside using a knife such as a cutter knife. Will be able to do.
Therefore, the work of providing the knockout hole is facilitated.

In other words, by providing the groove on the inside of the base 1 and the groove on the outside facing the groove, it is easy to recognize the position where the knockout portion 2 is cut, that is, from the inside and the outside, the knockout portion 2 is easily recognized. Since the groove 2 can be recognized and the thickness of the groove of the knockout portion 2 is thin, the cutting operation is easy. The outer grooves 6 can be designed so as not to impair the external design by changing the number of grooves and the cross-sectional shape of the grooves.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention. FIG. 2 shows only a diagram corresponding to FIG. 1 (c).

In FIG. 2, the slit 4 provided in the base bottom plate 1c in the embodiment of FIG. 1 is constructed so as to penetrate to the outside of the base (indicated by reference numeral 4a). Like the slit 4a, by opening the lower part of the base embedding part 1b so as to communicate with the outside of the base, the opening area around the lower part of the knockout part 2 is increased, and the work by the fingertip when cutting out the knockout part 2 is made easier. can do.

In the embodiment of FIGS. 1 and 2, only the lower side of the outer periphery of the knockout portion 2 is replaced with the slits 4 and 4.
Although it is referred to as a, this is that in order to form the inner groove, a slit must be provided in order to form the inner groove, and the work for cutting the knockout portion 2 along the groove and separating the knockout portion 2 This is because it is easy to remove and the design is simpler than the groove. However, it goes without saying that the entire outer circumference of the knockout portion 2 may be formed by forming a groove.

FIG. 3 is a vertical sectional view showing another embodiment of the present invention. 3 (a) is a perspective view of the knockout portion of the housing base as seen from the inside, and FIG. 3 (b) is shown in FIG.
Fig. 3 is a front view of the knockout part of (a) seen from the outside.
3C is a sectional view taken along the line CC of FIG.

In FIG. 3, the structure in which the slit 4 is provided in FIG. 1 is stopped, and the grooves 5, 6 are formed on the entire outer periphery of the knockout portion 2.
Is formed. As shown in FIG. 3 (a), a groove 5 is provided inside the housing base 1 so as to surround the knockout portion 2, and as shown in FIG. 3 (b), the groove 5 is provided.
A groove 6 is formed outside the base opposite to. In this case, grooves 5 and 6 are provided on the upper side and the lower side of the knockout portion 2 as shown in FIG. 3 (c). Even with this configuration, since the grooves 5 and 6 are opposed to each other on the inner side and the outer side, the wall thickness is thin and the knockout portion 2 can be easily cut off.

The portion corresponding to the outer periphery of the knockout portion 2 of the housing base 1 may be formed so as to have a reduced thickness at positions facing each other from the inside and the outside of the housing base 1, and the groove is formed. The same effect as in the case of can be obtained.

In the past, the knockout portion was provided on the outer circumference of the housing only on one side surface or at a specific location, but it can be placed on the entire outer circumference of the housing to allow freedom in wiring work. It can be configured to increase the degree.

FIGS. 4 to 6 show an embodiment in which the knockout portion formed as shown in FIG. 1 is arranged in the entire outer circumference of the casing base of the distribution board, for example.

FIG. 4 (a) is a plan view with the distribution board attached to the wall surface, FIG. 4 (b) is an upper side view, FIG. 4 (c) is a lower side view, and FIG. 4 (d) is the left side. FIG. 4 (e) is a right side view.

As can be seen from FIG. 4A, the outer appearance of the distribution board is composed of the base 1 and the cover 7 arranged so as to cover the opening surface on the base, and the cover 7 can be opened and closed. It has a door 7a. The appearance of these is the same as in FIG. 7.

FIG. 5 is a perspective view showing an arrangement of a plurality of knockout portions 2 formed in the embedded portion 1b of the housing base 1.

FIG. 6 shows a main circuit breaker 8 and a plurality (12 in the figure) of branch breakers 9 inside the housing base 1 of FIG.
It shows a plan view of a state in which is arranged. Here, the state in which the cover of the distribution board is removed is shown. The knockout portion 2 should be represented by a dotted line when viewed from above, but is shown by a solid line to make it easy to understand the existence of the knockout portion 2.

In the present embodiment shown in FIGS. 4 to 6, a plurality of knockout portions 2 are provided in the entire outer circumference of the embedded portion 1b of the housing base 1 which is attached and fixed to a wall surface or a wall construction.
Is arranged.

By disposing the wiring hole knockout portion 2 in the entire range of the embedded portion 1b of the housing base 1 in this manner, for example, the embedded portion 1b of the base 1 of the distribution board is installed in a wall.
Even if it is not possible to limit from which position on the outer circumference of the distribution board the electric wire conductor is drawn in or when wiring is performed,
It is possible to handle wiring and drawing in from various locations. Of course, the same applies to the case where the embedded portion 1b of the housing base 1 is fixed in an exposed state without being embedded in the wall, and it is possible to cope with wiring and drawing in from various places.

[0062]

As described above, according to the present invention, since the groove is formed on the housing in which the knockout portion is formed so as to reduce the thickness from both the inside and the outside, the appearance is improved. The work of providing the knockout wiring hole can be facilitated without damaging it. Further, since the knockout portion is provided in the entire outer circumference of the casing forming the distribution board, it is possible to handle wiring / retracting from various places.

[Brief description of drawings]

FIG. 1 is a diagram showing a knockout structure according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a knockout structure according to another embodiment of the present invention.

FIG. 3 is a diagram showing a knockout structure according to another embodiment of the present invention.

FIG. 4 is a diagram showing an embodiment in which a knockout portion formed as shown in FIG. 1, FIG. 2 or FIG. 3 is arranged on a casing base of a distribution board.

FIG. 5 is a perspective view showing a state in which a plurality of knockout portions are formed in the embedded portion of the casing base of the distribution board.

6 is a plan view showing a state in which a main breaker and a plurality of branch breakers are arranged inside the housing base of FIG.

FIG. 7 is a perspective view showing the configuration of a distribution board.

FIG. 8 is a diagram showing a knockout structure of the related art.

FIG. 9 shows another prior art knockout structure.

FIG. 10 illustrates another other prior art knockout structure.

[Explanation of symbols]

 1 ... Casing base 1b ... Embedded part 2 ... Knockout part 5 ... Groove inside base 6 ... Groove outside base

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[Procedure amendment]

[Submission date] June 14, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

[Figure 5]

FIG. 6

FIG. 7

[Figure 8]

[Figure 9]

FIG. 10

Claims (8)

[Claims] 1. A knockout structure characterized in that a groove is formed in a part or all of the outer periphery of a knockout portion of a housing at positions facing each other from the inside and the outside of the housing. 2. A knockout structure, characterized in that part or all of the outer periphery of a knockout portion of a housing is formed so as to have a reduced thickness at positions facing each other from the inside and the outside of the housing. 3. A housing for accommodating an electric device therein; formed on a part of the housing to introduce a wire conductor into the electric device from the outside or lead a wire conductor to the outside from the electric device. And a knockout portion formed by providing a groove at a position facing each other from the inside and the outside of the housing, in a part or all of the outer circumference of the knockout portion. And a knockout structure. 4. A housing for accommodating an electric device therein; formed on a part of the housing to introduce an electric wire conductor into the electric device from the outside or lead out an electric wire conductor from the electric device to the outside. And a knockout portion formed so that a part or all of the outer periphery of the knockout portion is thinned at positions facing each other from the inside and the outside of the housing. Knockout structure characterized by that. 5. The knockout structure according to claim 3, wherein the electric device is a power distribution device. 6. A distribution board characterized in that a knockout portion is provided in the entire outer circumference of the housing base. 7. A distribution board characterized in that a knockout portion is provided in the entire outer peripheral area of an embedded portion of a housing base mounted and fixed to a wall surface or a wall construction. 8. The distribution board according to claim 6 or 7, wherein the knockout portion has the knockout structure according to any one of claims 1 to 5.