JPH11289635A - Knock-out structure of box for wiring and piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To punch out knock-outs with ease and reliability without making visual errors in measuring distances in the knock-out structure of a box for wiring and piping which is provided with inner knock-out portions and outer knock-out portions. SOLUTION: An inner anchoring portion 11, to which a punching tool can be anchored, is formed on the outer face of an inner knock portion 5, and an outer hook portion 12 to which a punching tool can be hooked is formed on the outer face of an outer knock-out portion 6. The inner hook portion 11 and the outer hooked portion 12 comprise the inner knock-out portion 5 and the outer knock-out portion 6, and allow a removing tool to be hooked to the outer face of the inner knock-out portion 5 and the outer face of the outer knock-out portion 6. First connecting portions, which connect the inner knock-out portions 5 with the outer knock-out portions 6 and third connecting portions, which connect the outer knock-out portions 6 and the sidewalls are formed. The connecting strength of the third connecting portions is made higher than that of the first connecting portions, so as to prevent the outer knock-out portions 6 from being punched out together with the inner knock-out portions 5, when the inner knock-out portions 6 are punched out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock-out structure for a wiring / piping box having an inner knock portion and an outer knock portion so that a pipe having two diameters can be connected to the wiring / pipe box. It is about.

[0002]

2. Description of the Related Art Conventionally, a technique disclosed in Japanese Utility Model Application Laid-Open No. 61-65817 has been disclosed as a knockout structure for a wiring and piping box of this kind, which is shown in FIG.
In the figure, the side wall 2 of the box 1 for wiring and piping is
A knockout 4 to which two large and small diameter pipes can be connected is formed. The knockout 4 is formed of an inner knock portion 5 for connecting a small-diameter pipe and an outer knock portion 6 for connecting a large-diameter pipe, and the inner knock portion 5 and the outer knock portion 6 They are integrally connected by a plurality of connecting portions.

[0003]

However, the conventional wiring and
In the knockout structure of the piping box, when the inside knock portion is punched by using a removing tool such as a hammer, there is a case where the outer knock portion is erroneously measured.

In the case where both the inner and outer knock portions are punched, if only the outer knock portion remains, the outer knock portion has a crescent shape, so that it is difficult to narrow down the target.
There was a case where the box was damaged by hitting the knocking portion peripheral wall.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a knockout structure of a wiring and piping box which has an inner knock portion and an outer knock portion and which can punch out a knockout reliably and easily without erroneous measurement. It is.

[0006]

According to the first aspect of the present invention, there is provided a knockout structure for a wiring and piping box comprising an inner knock portion and an outer knock portion, wherein a removal tool can be engaged with an outer surface of the inner knock portion. With an internal locking portion.

According to a second aspect of the present invention, there is provided a knockout structure for a wiring / pipe box comprising an inner knock portion and an outer knock portion, and a removing tool is provided on each of an outer surface of the inner knock portion and an outer surface of the outer knock portion. It has an inner locking portion and an outer locking portion that can be stopped.

According to a third aspect of the present invention, there is provided a knockout structure for a wiring and piping box, wherein the first knocking portion connects the inner knocking portion and the outer knocking portion, and the outer knocking portion and the side wall. And a third connecting portion for connecting the third connecting portion with the first connecting portion so as to prevent the outer knocking portion from being punched out with the punching of the inner knocking portion. It is formed large.

According to a fourth aspect of the present invention, there is provided a knockout structure for a wiring and piping box, wherein the first connecting portion connects the inner knocking portion and the outer knocking portion according to the second or third aspect, and the inner knocking portion. A second connecting portion for connecting the portion and the side wall, and in order to also punch out the inner knock portion along with the punching of the outer knock portion, the connection strength of the first connecting portion is larger than that of the second connecting portion. It is formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, a box 1 for wiring and piping is formed in a rectangular cylindrical shape by a side wall 2, and an opening 3 is formed on at least the front side of the wall or the back side of the wall. A knockout 4 is formed on the side wall 2 at one location to which two large and small diameter pipes can be connected. The knockout 4 is formed by an inner knock portion 5 to which a small-diameter tube 21 shown in FIG. 4 is connected and an outer knock portion 6 to which a large-diameter tube 22 is connected. Knock portion 6 is integrally connected by a plurality of connecting portions. As shown in FIG. 3, the inner knock portion 5 and the outer knock portion 6
Is a first connecting portion 7 formed in a narrow width and a thin wall, the inner knock portion 5 and the peripheral wall 2a are a second connecting portion 8 also formed in a narrow width and a thin wall, and the outer knock portion 6 and a peripheral wall are formed. The second connecting portion 2a is connected to the second connecting portion 9 by a third connecting portion 9, which is also formed to be thin and thin.

Here, in each connecting portion, the connecting width and the thickness of the portion are made different so that at least the third
The connection strength of the connection portion 9 is set to be larger than that of the first connection portion 7. This embodiment corresponds to a third aspect.

Further, an inner locking portion 11 and an outer locking portion are formed on the outer surfaces of the inner knocking portion 5 and the outer knocking portion 6, respectively. 12 are formed. The inner locking portion 11 and the outer locking portion 12 formed of the narrow grooves may or may not penetrate to the inside. Further, the inner locking portion 1
The first and outer locking portions 12 do not necessarily have to be formed with concave portions in the narrow grooves, and if they can be locked with various removing tools for hitting and can prevent displacement when hitting, they are formed to protrude outwardly. May be used. Note that the outer locking portion 12 also functions as the third connecting portion 9.

Next, a description will be given of an operation of punching out a knockout for connecting a pipe in the knockout structure of the wiring / pipe box of the present embodiment configured as described above. First, when connecting a small-diameter tube 21, it is necessary to punch out the inner knock portion 5. To do that,
An inner locking portion 11 formed on the outer surface of the inner knock portion 5
The tip of the removal tool such as a screwdriver is fitted and locked in the inside, and the head of the removal tool is hit with a hammer or a hand in this state. Then, the first connecting portion 7 with the outer knocking portion 6
The second connecting portion 8 with the peripheral wall 2a is broken by an impact force, and the inner knocking portion 5 is punched. At this time, since the distal end of the removal tool is locked by the inner locking portion 11, displacement can be prevented, and the outer knocking portion 6 is not accidentally punched out and the peripheral wall 2a is not damaged. . Since the inner knocking portion 5 is formed with the inner locking portion 11, it is possible to break the connecting portions by inserting, removing, and locking the removal tool such as a screwdriver into the inner locking portion 11. Can also.

Here, since the third connecting portion 9 has a higher connection strength than the first connecting portion 7, the outer knocking portion 6 is not punched out when the inner knocking portion 5 is punched. After punching out the inner knock portion 5, the outer knock portion 6 functions as a normal peripheral wall. The joining strength of the third connecting portion 9 is such that the small-diameter tube 21 shown in FIG.
It is desirable to form it so that it does not break easily.

Next, the inner knock portion 5 and the outer knock portion 6
In order to connect the pipe 22 having a large diameter by punching out both of them, first, the inner knocking portion 5 is punched out in the same manner as above, and then the inside of the outer locking portion 12 formed on the outer surface of the outer knocking portion 6 is formed. Then, the tip of the removal tool such as a screwdriver is fitted and locked, and in this state, the head of the removal tool is hit with a hammer or hand. Then, the third connecting portion 9 connecting the peripheral wall 2a is formed.
Is broken by an impact force, and the outer knock portion 6 is punched. At this time, the outer knocking portion 6 has a crescent shape and a small beating area, but since the tip of the removing tool is locked by the outer locking portion 12, displacement can be prevented, and the peripheral wall 2a is erroneously removed. It will not be damaged. In the case where both the inner knock portion 5 and the outer knock portion 6 are punched, the outer knock portion 6 is first punched in the same manner, and then the inner knock portion 5 is punched. Good.

Here, the inner knock portion 5 and the outer knock portion 6
If the connection strength of the first connection portion 7 connecting the inner knock portion 5 and the connection strength of the second connection portion 8 connecting the inner knock portion 5 and the peripheral wall 2a is formed, the outer knock portion 6 is punched out. In addition, since the second connecting portion 8 side is broken first, the inner knock portion 5 is also punched at the same time as the outer knock portion 6 is punched out, so that the punching operation of the inner knock portion 5 can be omitted. The first connecting portion 7 and the second connecting portion 8
The connection strength can be easily made different by changing the connection width or thickness of that portion. This case corresponds to the fourth aspect. In addition, the connection strength between these connection parts is formed in the order of the second connection part 8, the first connection part 7, and the third connection part 9, and the third connection part 9 is maximized.
If the second connecting portion 8 is set to the minimum strength, it corresponds to both the third and fourth aspects.

After punching out the knockout, the pipes 21 and 22 can be connected as shown in FIG.

As described above, the knockout structure of the wiring and piping box of the present embodiment is a knockout structure of the wiring and piping box including the inner knocking portion 5 and the outer knocking portion 6. The outer knocking portion 6 has an inner locking portion 11 on which the removing tool can be locked, and the outer knocking portion 6 has an outer locking portion 12 on which the removing tool can be locked.

Accordingly, when a punch is performed by beating and punching using a removing tool such as a screwdriver, the tip of the removing tool is locked with the inner locking portion 11 and the outer locking portion 12 and does not shift. The inner knock portion 5 and the outer knock portion 6 can be reliably and easily punched without accidentally punching the outer knock portion 6 or damaging the peripheral wall 2a. Further, a removing tool such as a screwdriver may be fitted into the inner locking portion 11 and the outer locking portion 12 and locked to break each connecting portion, thereby removing the inner knock portion 5 and the outer knock portion 6. .

In the above embodiment, the inner knock portion 5 is connected to the peripheral wall 2a of the side wall 2. However, the present invention is not limited to this. For example, as shown in FIG. The knock portion 5 may be arranged inside the outer knock portion 6. Also in this embodiment, if the third connecting portion 9 is formed larger than the first connecting portion 7,
When the inner knock portion 5 is punched, only the inner knock portion 5 can be removed, and the small-diameter pipe 21 can be connected.

In each of the above embodiments, each connecting portion connecting the inner knock portion 5, the outer knock portion 6, and the peripheral wall 2a is formed to have a narrow width.
The connecting portions may be provided by forming the entire gaps thin.

[0022]

As described above, the wiring and wiring according to the first aspect of the present invention are described above.
The knockout structure of the piping box is a knockout structure of a wiring and piping box including an inner knocking portion and an outer knocking portion, and includes an inner locking portion to which a removal tool can be locked on an outer surface of the inner knocking portion. It is a thing. Therefore, when using a removal tool such as a screwdriver to strike and punch out, the tip of the removal tool is locked with the inner locking portion and does not shift, so that the outer knocking portion is also erroneously measured and punched out. The inner knock portion can be reliably and easily punched out without being rolled or damaging the side wall.

According to a second aspect of the present invention, there is provided a knock-out structure for a wiring / pipe box, wherein the outer knocking structure according to the first aspect further comprises an outer locking portion on which the removing tool can be locked. is there. Therefore, even when the outer knock portion is punched, the punch can be reliably and easily performed.

Furthermore, the knockout structure of the wiring / pipe box according to the third aspect of the present invention provides a knockout structure for connecting the inner knock portion and the outer knock portion according to the second aspect,
A third connecting portion connecting the outer knocking portion and the side wall, and a connecting strength of the third connecting portion to prevent the outer knocking portion from being punched out as the inner knocking portion is punched out. Are formed larger than the first connecting portion. Therefore, when the removal tool is locked to the inner locking portion and the inner knock portion is punched, only the inner knock portion can be reliably punched.

Further, the knock-out structure of the wiring / pipe box according to the invention of claim 4 is characterized in that the first connection portion connects the inner knock portion and the outer knock portion according to claim 2 or 3; A second connecting portion for connecting the knock portion and the side wall, wherein the connection strength of the first connecting portion is higher than that of the second connecting portion so that the inner knock portion is also punched along with the punching of the outer knock portion. It is formed large.
Therefore, since the second connecting portion is broken at the same time when the outer knock portion is punched, and the inner knock portion is also punched, the work of punching the inner knock portion can be omitted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a knockout structure of a wiring and piping box according to an embodiment of the present invention.

FIG. 2 is a front view showing a knockout structure of the wiring and piping box of FIG. 1;

FIG. 3 is a front view of a main part showing a knockout structure of the wiring and piping box of FIG. 1;

FIG. 4 is a perspective view showing a state where a pipe is connected to a knockout of the wiring and piping box of FIG. 1;

FIG. 5 is a main part front view showing a knockout structure of a wiring and piping box in another embodiment of the present invention.

FIG. 6 is a perspective view showing a knockout structure of a conventional wiring and piping box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box 2 Side wall 5 Inner knocking part 6 Outer knocking part 7 First connecting part 8 Second connecting part 9 Third connecting part 11 Inner engaging part 12 Outer engaging part

Claims (4)

[Claims] 1. A knock-out structure for a wiring and piping box comprising an inner knock portion and an outer knock portion, wherein an inner locking portion capable of locking a removal tool is provided on an outer surface of the inner knock portion. Knockout structure for wiring and piping boxes. 2. A knock-out structure for a wiring / pipe box comprising an inner knock portion and an outer knock portion, wherein an inner surface capable of engaging a removal tool with an outer surface of the inner knock portion and an outer surface of the outer knock portion, respectively. A knockout structure for a wiring and piping box, comprising a locking portion and an outer locking portion. A first connecting portion connecting the inner knocking portion and the outer knocking portion; and a third connecting portion connecting the outer knocking portion and the side wall, wherein the inner knocking portion is punched. 3. The wiring / pipe box according to claim 2, wherein the third connecting portion has a connection strength greater than that of the first connection portion so as to prevent the outer knock portion from being punched out. Knockout structure. 4. It has a first connecting portion for connecting the inner knock portion and the outer knock portion, and a second connecting portion for connecting the inner knock portion and the side wall, with the punching of the outer knock portion. The knockout of the wiring / pipe box according to claim 2 or 3, wherein the first connecting portion is formed to have a stronger connection strength than the second connecting portion so as to punch out the inner knocking portion. Construction.