KR20210008663A - Branch box for cable duct - Google Patents

Abstract

The present invention relates to a box having a structure which facilitates coupling between any one wiring duct for lighting and communication, and another wiring duct branching to a side surface from any one wiring duct. The branch box for a wiring duct comprises: a first block module (1-1) including a first upper plate (10-1) and a first lower plate (20-1), and a first side plate (30-1) for vertically connecting the first upper plate (10-1) and the first lower plate (20-1); a second block module (1-2) including a second upper plate (20-2) and a second lower plate (10-2), and a second side plate (30-2) for vertically connecting the second upper plate (20-2) and the second lower plate (10-2). The end portions of the first upper plate (10-1) and the second upper plate (20-2) and the end portions of the first lower plate (20-1) and the second lower plate (10-2) are assembled with each other, so that the first block module (1-1) and the second block module (1-2) are combined in a form of surrounding a wiring duct (MD) in which a cable for luminaire or communication is built-in. Therefore, safety accidents are prevented by having a structure which can be easily installed even when welding is not performed at high altitude, a process time and installation costs are also reduced, and unlike welding, there is no risk of destruction due to deterioration even after a long period of time, such that there is no risk of damage and maintenance.

Description

Branch box for cable duct

The present invention is a member that is coupled to a wiring duct for lighting and communication installed on the ceiling, and has a structure that facilitates coupling with one wiring duct and another wiring duct branching from one wiring duct to the side. It's about the box.

In general, as shown in FIG. 1, a wiring duct having a built-in wiring is installed on the ceiling of a building or other facility in which lighting is used so that wiring for supplying power to the lighting power supply and a communication wiring are safely arranged.

However, since the wiring built in the wiring duct must be arranged so that all power can be supplied to a large indoor space, the wiring duct is not formed only in a straight line, but a region that is branched into several branches may occur.

At this time, the form in which the wiring duct branching from any one wiring duct is installed is conventionally made by welding. Installation of branched wiring ducts through welding requires welding work at high altitude, resulting in operator risk, and there is also a risk of fire due to welding sparks, and a significant increase in process time and installation cost is inevitable because long work is required at high altitude. . In addition, the installation of the wiring duct branching through welding may be destroyed if the welded part is deteriorated by vibration and corrosion for a long period of time, so there is a risk of a safety accident in which the wiring and the wiring duct fall to a person or vehicle under the wiring duct.

Since the wiring duct is a facility used in almost all buildings or structures, it is necessary to develop a safer installation technology to prevent accidents, and it is also necessary to save the installation process and cost through this.

Unexamined Patent Publication No. 10-2009-0081903 (published date: July 29, 2009)

Accordingly, the present invention prevents safety accidents and reduces process time and installation cost by having a structure that can be easily installed even if welding work is not performed at high altitude when a wiring duct branching from any one wiring duct is installed. We intend to provide a branch box for wiring ducts that does not have the risk of maintenance and damage because there is no fear of destruction due to deterioration even after a long time.

The branch box for a wiring duct according to the present invention for achieving this purpose includes a first upper plate 10-1 and a first lower plate 20-1, and a first upper plate 10-1 and a first lower plate 20- 1) A first block module (1-1) consisting of a first side plate (30-1) connecting vertically, a second upper plate (20-2), a second lower plate (10-2), and a second upper plate ( 20-2) and a second block module (1-2) consisting of a second side plate (30-2) vertically connecting the second lower plate (10-2), the first upper plate (10-1) and The end of the second upper plate 20-2 and the ends of the first lower plate 20-1 and the second lower plate 10-2 are assembled to each other, so that the first block module 1-1 and the second block module (1-2) It is combined in the form of wrapping the wiring duct (MD) in which the luminaire or communication cable is embedded.

Herein, a fastening bar 11-1 protruding long toward the other, preferably at an end of any one of the first or second upper plate 20-2 and one of the first or second lower plate 10-2 ,11-2) is formed, and the other is formed with fastening holes 21-1 and 21-2 into which fastening bars 11-1 and 11-2 are assembled.

And the fastening bar (11-1, 11-2) is preferably composed of a body formed long, and a locking head formed at the end of the body, the locking head to be inserted into the fastening holes (21-1, 21-2) When the locking head is caught on the inner wall of the fastening holes 21-1 and 21-2, the fastening bars 11-1 and 11-2 and the fastening holes 21-1 and 21-2 are assembled.

In this case, the fastening bars 11-1 and 11-2 are preferably formed on the first upper plate 10-1 and the second lower plate 10-2, and the fastening holes 21-1 and 21-2 are It is formed on the first lower plate 20-1 and the second upper plate 20-2, and the first upper plate 10-1 and the second lower plate 10-2 are manufactured to have the same shape and size. The first and second block modules 20-1 and 20-2 are manufactured to have the same shape and size, so that the first block module 1-1 and the second block module 1-2 have the same shape and size. Is the same, but one is assembled with the other in a state in which it is upside down.

In particular, the lengths of the first upper plate 10-1 and the first lower plate 20-1 are preferably made differently, so that the contact point between the first upper plate 10-1 and the second upper plate 20-2 and Points where the first lower plate 20-1 and the second lower plate 10-2 contact each other are located on different vertical surfaces.

In addition, the fastening holes 21-1 and 21-2 are preferably formed in a shape that penetrates vertically, and the width of the locking head increases from the front end to the rear end, and the rear end is formed in a vertical surface to form a step with the body, As the vertical surface of the locking head is caught on the inner wall of the fastening holes 21-1, 21-2, the fastening holes 21-1, 21-2 and the locking head are assembled, and the fastening holes 21-1, 21- 2) In the longitudinal end edges of the first lower plate 20-1 and the second upper plate 20-2, which are formed, preferably toward the inside of the first upper plate 10-1 and the second lower plate 10-2. A protruding step in the form of insertion is formed, and a retreat step into which the protruding step is inserted is formed at the end edges of the first upper plate 10-1 and the second lower plate 10-2 on which the locking head is formed, so that the locking head is The state in close contact with the fastening holes 21-1 and 21-2 is firmly maintained.

At this time, the bottom surface of the first lower plate 20-1 and the upper surface of the second upper plate 20-2 on which the fastening holes 21-1 and 21-2 are formed preferably have a plate member having a predetermined shape and an end of the plate member. A release switch consisting of a projection formed in a direction toward the fastening holes 21-1 and 21-2 is elastically variable with respect to the bottom of the first lower plate 20-1 or the upper surface of the second upper plate 20-2. Attached as possible.

In addition, two fastening bars 11-1, 11-2 and fastening holes 21-1, 21-2 are preferably formed in the width direction, and the release switch is fastening holes 21-1, 21-2. The ends are branched into two branches to correspond to those formed by the two, and projections facing the fastening holes 21-1 and 21-2 are formed at each branched end.

The branch box for a wiring duct according to the present invention has a structure that can be easily installed even if the welding work is not performed at high altitude when a wiring duct branching from any one wiring duct is installed, thereby preventing safety accidents and preventing process time and installation cost. It is reduced, and unlike welding, there is no risk of destruction due to deterioration even after a long time elapses, so there is no risk of maintenance and damage.

1 is a perspective view of an installation state of a branch box for a wiring duct according to the present invention,
2 is an exploded perspective view of a branch box for a wiring duct according to the present invention,
Figure 3 is an exploded perspective view of the configuration of Figure 2 arranged side by side,
Figure 4 is a front cross-sectional view of Figure 2,
5 is a partially enlarged view of FIG. 4;
6 is an exploded perspective view showing a further embodiment of FIG. 2;
7 is a partially enlarged view to which the additional embodiment of FIG. 6 is applied to FIG. 5;

Specific structural or functional descriptions presented in the embodiments of the present invention are exemplified only for the purpose of describing the embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms. In addition, it should not be construed as being limited to the embodiments described in the present specification, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The branch box for a wiring duct according to the present invention is composed of a first block module 1-1 and a second block module 1-2, as shown in FIG. 2.

The first block module 1-1 vertically connects the first upper plate 10-1 and the first lower plate 20-1, and the first upper plate 10-1 and the first lower plate 20-1. It is composed of the first side plate (30-1), so it has a shape similar to'C' as a whole.

The second block module (1-2) vertically connects the second upper plate (20-2) and the second lower plate (10-2), and the second upper plate (20-2) and the second lower plate (10-2). It is made of the second side plate (30-2), and has a shape similar to'c' as a whole, similar to the first block module (1-1).

Here, as shown in FIG. 1, the first block module 1-1 and the second block module 1-2 include end portions of the first top plate 10-1 and the second top plate 20-2, The ends of the first lower panel 20-1 and the second lower panel 10-2 are assembled to each other, so that the first block module 1-1 and the second block module 1-2 are equipped with a light fixture or communication cable. It is combined in a form surrounding the wiring duct MD.

At this time, the first block module 1-1 and the second block module 1-2 do not need a separate fastening member for coupling between the two, and as shown in FIG. 2, the first or second top plate 20- 2) A fastening bar (11-1, 11-2) protruding long toward the other is formed at either end of one of the first or second lower plate (10-2), and the other is fastened. Fastening holes 21-1 and 21-2 into which the bars 11-1 and 11-2 are assembled are formed.

Here, the fastening bars 11-1 and 11-2 consist of a long body and a locking head formed at the end of the body, and when the locking head is inserted into the fastening holes 21-1, 21-2, the fastening holes As the locking head 111-1 is caught on the inner wall of (21-1, 21-2), the fastening bars 11-1, 11-2 and the fastening holes 21-1, 21-2 are assembled. Therefore, the first block module 1-1 and the second block module 1-2 have a configuration that can be assembled with each other.

In this way, the first block module 1-1 and the second block module 1-2 are combined in a form surrounding the wiring duct MD, so that another wiring is performed at a predetermined portion of any one wiring duct MD. When the duct MD was to be installed in a branching form, it had to be combined by welding, but in the present invention, the branch wiring duct MD was attached to the first side plate 30-1 or the second side plate 30-2. The wiring duct (MD) is bonded without welding by drilling the hole through which is passed and inserting the branch wiring duct (MD).At this time, the branch wiring duct (MD) and the branch wiring duct (MD) are not shown. , By extending the end of the branch wiring duct MD in the form of a flange, additional bolting may be achieved.

However, if such a branch box is divided into two parts, the first and second block modules 1-2, and is not formed to be assembled with each other, as in the present invention, the branch box is formed integrally with the wiring duct ( In order to be installed in MD), the branch box must be fitted from the disconnected end of the wiring duct MD after cutting a certain part of the wiring duct MD. Such installation can be a more difficult task, especially when it is necessary to install a branch wiring duct (MD) in an existing wiring duct (MD), and the wiring inside the wiring duct (MD) must be removed during the installation process. May occur.

Therefore, the branch box for a wiring duct according to the present invention is divided into two parts, the first and second block modules 1-2, and the first and second block modules 1-2 are assembled to each other without a separate member. It is configured to be possible.

However, when the branch box is divided into two parts, if the first block module 1-1 and the second block module 1-2 are manufactured separately from each other, two molds are required, and the first block module ( The balance of supply and demand of parts between 1-1) and the second block module (1-2) should always be considered, and in field work, if one of the first and second block modules (1-2) runs out of stock, the other The problem of becoming useless occurs, and furthermore, this problem may occur when only one of the first and second block modules (1-2) remains, so that no further work can be performed despite the cost of inventory. have.

In the present invention, the first block module (1-1) and the second block module (1-2) are substantially each other in shape and size so that an optimal supply and supply of parts can be achieved at any moment while preventing such a problem from occurring. Can be made exactly the same.

Specifically, as shown in FIG. 2, the fastening bars 11-1 and 11-2 are formed in the first upper plate 10-1 and the second lower plate 10-2, and the fastening holes 21-1, 21-2) is formed on the first lower plate 20-1 and the second upper plate 20-2, so that the first block module 1-1 and the second block module 1-2 are completely identical to each other. Even if it is manufactured in the size of and, if one is turned over as shown in FIG. 2 with respect to the other, it is formed to be mutually assembled. Therefore, when the first block module 1-1 and the second block module 1-2 are arranged side by side as shown in FIG. 3, it can be seen that they are the same.

In this way, if the first block module (1-1) and the second block module (1-2) are manufactured identically to each other, there is virtually no need for distinction between the two, and even if one of the stocks remains in the field, the other stock There is no situation in which the work cannot be performed due to lack of, and thus, this unreasonable inventory cost problem also does not occur. In addition, since both the first block module (1-1) and the second block module (1-2) can be produced with a single mold, manufacturing costs are significantly reduced, and it is also necessary to pay attention to the problem of supply and demand and balance between parts. As a result, the entire material procurement process can be clearly managed.

At this time, since the first block module 1-1 and the second block module 1-2 are substantially the same, the first upper plate 10-1 is completely the same as the second lower plate 10-2, and the first lower plate ( 20-1) is completely the same as the second upper plate 20-2. Here, the concept of'upper, lower' was finally attached based on FIG. 2. Therefore, when referring to FIG. 3, the first block module 1-1 is in a horizontally rotated posture so that the inside is visible, and the second block module 1-2 in FIG. 3 is the second block module ( In 1-2), the top and bottom are reversed.

Particularly in the present invention, when the first block module 1-1 is used as a reference, the first upper plate 10-1 and the first lower plate 20-1 have different lengths, so that the first upper plate 10- The point where 1) and the second upper plate 20-2 contact each other and the point where the first lower plate 20-1 and the second lower plate 10-2 contact each other are located on different vertical surfaces.

That is, as shown in Figs. 1 and 2, when the first block module 1-1 and the second block module 1-2 are combined with each other, the combined branch box is centered on the connection line of the two modules on both the top and bottom surfaces. It is formed to be biased to either side from

It does not matter if the branch box according to the present invention is coupled to the already installed wiring duct MD, but when the branch box is coupled to the wiring duct MD during the installation process of the wiring duct MD, one operator When the first block module 1-1 is gripped with one hand and the second block module 1-2 is gripped with the other hand, there is a problem that the wiring duct MD cannot be gripped.

At this time, referring to FIG. 4, when the upper and lower plates of the first and second blocks are formed with different lengths, as shown in FIG. 4, the wiring duct MD is drawn while holding the wiring duct MD first. As shown in 4, if the first block module 1-1 is disposed so as to be nested, the operator can also grip the wiring duct MD if only the first block module 1-1 is held with one hand. At this time, the second block module 1-2 can be coupled with the other hand. However, if both the upper and lower plates of the first and second block modules 1-2 are formed to have the same length (not shown), the upper and lower plates of the first block module 1-1 and the second block module 1-2 Since the lower panel is covered only to the center of the wiring duct MD, it is unstable even if the wiring duct MD is inserted into the first block module 1-1 similar to FIG. 4, the operator can use the second block module 1- 2) can be difficult to use. Therefore, as in the present invention, when the upper and lower plates of the first and second block modules 1-2 have different lengths, one operator can easily perform the work of coupling the branch box to the wiring duct MD. have.

Meanwhile, a mechanism formed so that the first block module 1-1 and the second block module 1-2 can be assembled to each other is as shown in FIGS. 3 and 5. Specifically, the fastening holes 21-1 and 21-2 are formed in a form that penetrates up and down, and the width of the locking head increases from the front end to the rear end, and the rear end is formed in a vertical surface to form a step with the body, The vertical surfaces of the fastening holes 21-1 and 21-2 are engaged with the inner walls of the fastening holes 21-1 and 21-2, and the fastening holes 21-1 and 21-2 and the locking head are assembled. At this time, the first lower plate 20-1 and the second upper plate 20-2 are formed with fastening holes 21-1 and 21-2 on the longitudinal edge of the first upper plate 10-1 and the second lower plate ( A retreat step in which the protruding step is inserted into the end edges of the first upper plate 10-1 and the second lower plate 10-2 on which the first upper plate 10-1 and the second lower plate 10-2 are formed with a protruding step inserted into the inside of 10-2) By being formed, a state in which the locking head is in close contact with the fastening holes 21-1 and 21-2 can be firmly maintained.

Referring to FIG. 2, when the first retraction step formed at the end of the first top plate 10-1 and the second protruding step 24-2 formed at the end of the second top plate 20-2 are not formed, , Even if the first locking head 111-1 formed on the first top plate 10-1 is assembled in a form that is inserted into the second fastening hole 21-2, the second top plate 20-2 is lifted upward. Then, the first upper plate 10-1 and the second upper plate 20-2 are separated from each other. However, when the first retreating step and the second protruding step 24-2 are formed, the second protruding step 24-2 formed on the second upper plate 20-2 is formed on the second protruding step 24-2. It is prevented that the second upper plate 20-2 is lifted upward at all due to the first retreat step in contact. Therefore, the vertical direction in which the first and second retreating steps 25-2 and the first and second protruding steps 24-2 are separated from each other, and the first and second fastening bars 11-1 and 11-2 After being coupled to the first and second fastening holes 21-2, the vertical directions separated from each other become opposite to each other, so that the first block module 1-1 and the second block module 1-2 are combined. It can be kept more solid.

Meanwhile, in the branch box according to the present invention, as shown in FIG. 6, the second or first fastening bars 11-1, 11-2 and 11- assembled in the first or second fastening holes 21-2. A release switch is installed to separate 1) with one touch.

Referring to FIG. 7, the first locking head 111-1 formed at the front end of the first fastening bars 11-1, 11-2 and 11-1 enters the second fastening hole 21-2. While being caught by the second locking plate (22-2), it is bent downward by an elastic variable distance (S) indicated by'S' toward the bottom, and then the first locking head (111-1) is completely closed to the second fastening hole (21-). When entering 2), it rises again at the point where the contact with the second locking plate 22-2 ends.

At this time, in order to dismantle the branch box according to the present invention for maintenance or other reasons, first, the first locking head 111-1 must be lowered toward the bottom by an elastically variable distance S. However, here, the second fastening hole 21-2 may be small so that it is difficult for a finger to completely enter, and in particular, when a worker wears gloves, it may be difficult for a finger to enter. Therefore, the operator must use a separate tool to disassemble the first block module (1-1) and the second block module (1-2). However, the first block module (1-1) and the second block module (1-2) have a structure in which both upper and lower portions are assembled, so the first locking head 111-1 on the upper side and the second locking module on the lower side It can be difficult to press all of the heads.

In particular, the first and second fastening holes 21-2 and the first and second fastening bars 11-1 and 11-2 are formed in two side by side as shown in FIG. Therefore, the work of dismantling the first block and the second block can be quite tricky for one operator to perform.

To solve this problem, a release switch is provided in FIGS. 6 and 7 in the branch box according to the present invention. The second release switch 23-2 shown in FIG. 7 is located on the side where the first or second fastening hole 21-2 is formed, that is, the second upper plate 20-2 or the first lower plate 20-1. Installed. As shown in FIG. 7, the second release switch 23-2 is in a direction toward the second plate member having a constant shape and the second fastening holes 21-1 and 21-2 at the ends of the second plate member. It consists of a formed second protrusion. Here, since the second plate member is elastically variably attached to the upper surface of the second upper plate 20-2, pressing the second release switch 23-2 with a finger shown in FIG. 7 causes the first fastening plate to become a second fastening hole ( If you lift your finger after getting out of 21-2), it will return to its original position.

In addition, the protruding thickness of the second protrusion may be formed to a length such that the first fastening head is lowered by the elastically variable distance S described above, or may be formed to be slightly thicker than that.

On the other hand, two fastening bars 11-1, 11-2 and fastening holes 21-1, 21-2 are formed in the width direction, and the release switch has two fastening holes 21-1, 21-2. The ends are divided into two branches so as to correspond to the one formed as a dog, and a protrusion toward the fastening holes 21-1 and 21-2 may be formed at each of the branched ends.

Alternatively, as shown in Fig. 6, the release switch is not a branched type, but when pressed with one finger, the fastening bars 11-1, 11- fastened to both fastening holes 21-1 and 21-2 formed side by side. It can be formed to be able to release 2) at the same time.

And, for reference, what is expressed as'first' in the present description can be applied equally to'second' and vice versa. This is because the first block module 1-1 and the second block module 1-2 are formed in the same shape. Likewise, even if there is no expression'first' or'second', it can be applied to both'first' and'second'.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the technical spirit of the present invention. It will be obvious to those who have the knowledge of.

MD: Wiring duct S: Elastic variable distance
1-1: 1st block module 1-2: 2nd block module
10-1: first upper plate 10-2: second lower plate
11-1: 1st fastening bar 11-2: 2nd fastening bar
20-1: first lower plate 20-2: second upper plate
21-1: 1st fastening hole 21-2: 2nd fastening hole
22-1: first jamming plate 22-2: second jamming plate
23-2: second release switch 24-1: first protruding step
24-2: second protruding step 25-2: second retreating step
30-1: first side plate 30-2: second side plate
31-1: 1st branch duct guide hole 31-2: 2nd branch duct guide hole
111-1: first engaging head 112-1: first body
231-2: second plate member 232-2: second protrusion

Claims (7)

Consisting of a first upper plate 10-1 and a first lower plate 20-1, and a first side plate 30-1 vertically connecting the first upper plate 10-1 and the first lower plate 20-1 A first block module (1-1);
Consisting of a second upper plate (20-2) and a second lower plate (10-2), and a second side plate (30-2) vertically connecting the second upper plate (20-2) and the second lower plate (10-2) A second block module (1-2); It consists of,
The ends of the first upper plate 10-1 and the second upper plate 20-2, and the ends of the first lower plate 20-1 and the second lower plate 10-2 are assembled to each other, so that the first block module A branch box for a wiring duct, characterized in that (1-1) and the second block module (1-2) are coupled in a form surrounding a wiring duct (MD) in which a luminaire or a communication cable is embedded. The method of claim 1,
Fastening bars (11-1, 11-) protruding long toward the other at either end of one of the first or second upper plate 20-2 and one of the first or second lower plate 10-2 2) is formed, and the other is formed with fastening holes 21-1 and 21-2 into which fastening bars 11-1 and 11-2 are assembled,
The fastening bars 11-1 and 11-2 consist of a long body and a locking head formed at the end of the body, and when the locking head is inserted into the fastening holes 21-1, 21-2, the fastening hole ( For wiring duct, characterized in that the fastening bars 11-1, 11-2 and the fastening holes 21-1, 21-2 are assembled by engaging the locking head on the inner wall of the 21-1, 21-2). Branch box. The method of claim 2,
The fastening bars 11-1 and 11-2 are formed on the first upper plate 10-1 and the second lower plate 10-2,
The fastening holes 21-1 and 21-2 are formed in the first lower plate 20-1 and the second upper plate 20-2,
The first upper plate 10-1 and the second lower plate 10-2 are manufactured to have the same shape and size from each other,
The first lower plate 20-1 and the second upper plate 20-2 are manufactured to have the same shape and size from each other,
The first block module (1-1) and the second block module (1-2) have the same shape and size, but are assembled with the other in a state in which one is inverted up and down. box. The method of claim 3,
The first upper plate 10-1 and the first lower plate 20-1 have different lengths,
The contact point of the first upper plate 10-1 and the second upper plate 20-2 and the contact point of the first lower plate 20-1 and the second lower plate 10-2 are on different vertical surfaces. Branch box for wiring duct characterized by the above. The method of claim 3,
The fastening holes 21-1 and 21-2 are formed to penetrate vertically,
The width of the locking head increases as it goes from the front end to the rear end, and the rear end is formed in a vertical surface to form a step with the body. -1,21-2) and the locking head are assembled,
The first upper plate 10-1 and the second lower plate 10 are provided at the longitudinal end edges of the first lower plate 20-1 and the second upper plate 20-2 on which the fastening holes 21-1 and 21-2 are formed. A protruding step of the shape inserted into the inside of -2) is formed,
A retreat step into which the protruding step is inserted is formed at the end edges of the first upper plate 10-1 and the second lower plate 10-2 on which the locking head is formed,
A branch box for a wiring duct, characterized in that a state in which the locking head is in close contact with the fastening holes 21-1 and 21-2 is firmly maintained. The method of claim 5,
The lower surface of the first lower plate 20-1 and the upper surface of the second upper plate 20-2 on which the fastening holes 21-1 and 21-2 are formed have a plate member having a certain shape, and a fastening hole at the end of the plate member. A release switch consisting of a projection formed in a direction toward (21-1, 21-2) is elastically and variablely attached to the bottom surface of the first lower plate 20-1 or the upper surface of the second upper plate 20-2 A branch box for a wiring duct, characterized in that. The method of claim 6,
Two of the fastening bars 11-1 and 11-2 and the fastening holes 21-1 and 21-2 are formed in the width direction,
The release switch is divided into two ends so as to correspond to the formation of two fastening holes 21-1 and 21-2, and a protrusion toward the fastening holes 21-1 and 21-2 at each branched end Branch box for wiring duct, characterized in that the formed.

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