KR102253600B1 - Cable junction box for communication lines that facilitate short-circuiting in buildings - Google Patents

Abstract

The present invention relates to a cable junction box for a communication line for facilitating short-circuiting in a building. The cable junction box comprises: a cabinet having an open front portion and a transparent window installed therein, a first opening portion provided in one side surface thereof, and a second opening portion provided in the other side surface thereof; a first side cover installed in the first opening portion to be opened and closed, and having a plurality of first installation hole portions formed therein; a second side cover installed in the second opening portion to be opened and closed, and having a plurality of second installation hole portions formed therein; a first connection block integrally installed on the first side cover, and electrically connected to a lead-in cable inserted through the first installation hole portion; a second connection block integrally installed on the second side cover, and electrically connected to a lead-out cable inserted through the second installation hole portion; a connection terminal which is installed inside the cabinet, and electrically connected to the first connection block when the first side cover is closed and the first connection block is inserted into the cabinet, and electrically connected to the second connection block when the second side cover is closed and the second connection block is inserted into the cabinet, so as to electrically connect the lead-in cable and the lead-out cable; and a fixing portion which restrains the lead-in cable inserted into the first installation hole portion or the lead-out cable inserted into the second installation hole portion, so as to prevent the electrical connection between the first connection block or the second connection block and the lead-in cable or the lead-out cable from being released.

Description

Cable junction box for communication lines that facilitate short-circuiting in buildings}

The present invention relates to a cable connection box for a communication line for easy connection in a building, and more particularly, an incoming cable and an outgoing cable can be installed to be connected to a terminal box without a separate fastening member, and the entire terminal box is not opened. Incoming cable or outgoing cable can be installed by opening and closing only the side cover, and it is possible to prevent the incoming cable or outgoing cable from being separated from the terminal box or the part to which the incoming cable or outgoing cable is connected to be deformed or damaged, contrary to the intention of the operator. It relates to a cable junction box for communication lines that can be easily wired within.

In general, a telecommunication line is installed in a building to perform communication, and a cable junction box is installed to connect the telecommunication line to each other or to distribute it to a plurality of locations of the building.

The cable junction box is buried inside the wall and a terminal block is installed inside to connect communication cables that are drawn in or out through the inside of the wall, but there is a problem that connection is not easy because a plurality of communication cables are connected to the terminal block. .

In order to solve this problem, the “cable junction box for a telecommunication line for easy wiring” of Korean Registered Patent Publication No. 10-1903050 (announced on November 22, 2018) has been disclosed.

The conventional cable junction box for a telecommunication line is a long rectangular parallelepiped, which is a non-conductor, has a concave part inwardly formed in the center of the front side, and a plurality of square energizing concave parts are formed at regular intervals in the longitudinal direction, and a rectangular energizing concave part is formed at the upper end of the rear side. Concave portions are formed from the top to the inside, and on the top surface, a fixed sliding terminal to which the inflow-side communication line is fixedly coupled has an upper energizing guide groove through which sliding movement, and a plurality of rear sliding energizing grooves are formed at regular intervals in the longitudinal direction. In the lower part of the front side, a concave part is formed from the lower side of the rectangular power supply part to the inside, and at the lower surface, a fixed sliding terminal to which the outlet side communication line is fixedly connected has a lower energization guide groove that slides and moves, and a plurality of front sides at regular intervals in the longitudinal direction. Sliding conduction grooves are formed, and upper conduction holes penetrating through the square conduction recess are respectively formed at the front end of the inner end of the rear sliding conduction groove, and the lower conduction holes penetrate through the square conduction recesses at the front end of the inner end of the sliding conduction grooves. It is formed, and the side section of the cable junction box body, each of which has a fixing hole in the lower and rear sides in a shape of "b" in the left and right ends, and a conductor with an "S" shape in the side cross-section. The elastic spring plate is inserted into the square current-conducting recess of the main body of the cable connection box, and the front upper end protrudes into the rear sliding conduction groove through the upper conduction hole, and the rear lower part protrudes into the front sliding conduction groove through the lower conduction hole. The upper and lower energization springs that form the energization of the rear sliding energization groove and the front sliding energization groove, and a rubber material that is inserted into the square energization convex part of the cable connection box main body to prevent foreign matters containing moisture from entering the rectangular energization concave part. It consists of a sealing cap.

The conventional cable junction box for telecommunication lines, which is easy to connect with such a configuration, has a simple structure, can be easily manufactured, and is inexpensive, and can be easily connected to the telecommunication line connection box. there was.

However, the conventional cable junction box for telecommunication lines, which is easy to connect, has the hassle of peeling off the outer shell when connecting cables, and when connecting cables, there is a hassle of tightening the insulation fixing cap for each cable. , There was a problem that it was not possible to easily determine whether the cable was electrically connected from the outside.

In order to solve the above problems, a cable junction box for telecommunication lines, which is easy to connect in a building, has been developed, and the junction box according to the prior art is a box-shaped box with an empty inside, and a first cable In a cable junction box for a telecommunication line that is easy to connect in a building including a terminal block that electrically connects the first cable and the second cable, the terminal block includes a plurality of terminal coupling portions connecting the first cable and the second cable, and a plurality of terminals. It includes a terminal housing accommodating the coupling portion together.

The background technology of the present invention is disclosed in Korean Registered Patent Publication No. 10-2198894 (announced on January 05, 2021, title of invention: cable connection box for a telecommunication line for easy connection in a building).

Since the junction box according to the prior art is equipped with a separate technical configuration for fixing the lead-in cable or the lead-out cable, the operator who installs the lead-in cable or the lead-out cable is required to install a separate technical configuration in the junction box. Convenience cannot be achieved, and when the lead-in cable or lead-out cable is installed in the junction box, the entire junction box must be opened to proceed with the work. Therefore, when the door is closed after installing the lead-in cable or lead-out cable, the door and the cable interfere. There is a problem in that connection failure may occur or the cable may be deformed or damaged.

Therefore, there is a need to improve this.

In the present invention, the lead-in cable and the lead-out cable can be installed to be connected to the terminal box without a separate fastening member, and the lead-in cable or the lead-out cable can be installed by opening and closing only the side cover without opening the entire terminal box. It is an object of the present invention to provide a cable junction box for communication lines that facilitates wiring within a building that can prevent the lead-in cable or lead-out cable from being separated from the terminal box or the portion to which the lead-in cable or lead-out cable is connected to be deformed or damaged.

The present invention includes a cabinet having a front opening to install a transparent window, a first opening on one side, and a second opening on the other side; A first side cover installed to be opened and closed at the first opening and having a plurality of first installation holes formed therein; A second side cover installed to be opened and closed at the second opening and having a plurality of second installation holes formed therein; A first connection block integrally installed on the first side cover and electrically connected to a lead-in cable inserted through the first installation hole; A second connection block integrally installed on the second side cover and electrically connected to a lead cable inserted through the second installation hole; It is installed inside the cabinet, and when the first side cover is closed and the first connection block is inserted into the cabinet, it is electrically connected to the first connection block, and the second side cover is closed and the second connection A connection terminal electrically connected to the second connection block when the block is inserted into the cabinet to electrically connect the lead cable and the lead cable; Electrical connection between the first connection block or the second connection block and the lead cable or the lead cable by restraining the lead cable inserted in the first installation hole or the lead cable inserted in the second installation hole It characterized in that it comprises a fixing portion for preventing the release.

In addition, the connection terminal of the present invention includes a plurality of first pin terminals provided on one side of the connection terminal to be inserted into the first connection block; A plurality of second pin terminals provided on the other side of the connection terminal to be inserted into the second connection block; And a conductor member installed across the connection terminal to electrically connect the first pin terminal and the second pin terminal.

In addition, the first connection block of the present invention includes: a first passage hole formed across the first connection block to communicate with and communicate with the first installation hole; A first terminal groove installed in the first passage hole and electrically connected by inserting an end of the lead-in cable from one end of the first passage hole; And a second terminal groove provided in the first through hole so as to be in close contact with the first terminal groove and electrically connected by inserting the first pin terminal inserted from the other end of the first through hole. Characterized in that.

In addition, the second connection block of the present invention includes a second passage hole formed across the second connection block so as to be connected to and communicated with the second installation hole; A third terminal groove installed in the second passage hole and electrically connected by inserting an end of the lead cable from one end of the second passage hole; And a fourth terminal groove provided in the second passage hole so as to be in close contact with the third terminal groove and electrically connected by inserting the second pin terminal inserted from the other end of the second passage hole. Characterized in that.

In the cable junction box for a communication line for easy connection in a building according to the present invention, openings are formed on both sides of the cabinet, and side covers for opening and closing the openings are installed in a pair of openings, respectively, and lead-in cables or lead-outs are provided on the side covers. A connection block to which cables are electrically connected is provided, and when the side cover is closed, the connection block is inserted into the cabinet and is electrically connected to the connection terminal, so there is an advantage that the lead-in cable or the lead-out cable can be connected to each other without separate tightening work. .

In addition, the cable junction box for a communication line for easy connection in a building according to the present invention is provided with a fixing part for fixing the incoming cable or outgoing cable inserted into the side cover, so when the incoming cable and outgoing cable are inserted into the side cover, the fixing part By the operation of the cable is fixed to the side cover and the connection block, there is an advantage that it is possible to prevent the connection of the cable from being released or the connection part of the cable from being deformed or damaged during the operation of opening and closing the side cover.

1 is a block diagram illustrating a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a fixing part of a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention.
4 is a block diagram illustrating a fixing part and an interference prevention part of a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention.

Hereinafter, an embodiment of a cable junction box for a communication line for easy connection in a building according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators.

Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is a block diagram showing a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention, and FIG. 2 is for a communication line for easy connection in a building according to an embodiment of the present invention. A cross-sectional view of a cable junction box is shown, and FIG. 3 is a cross-sectional view showing a fixing part of a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention, and FIG. 4 is It is a configuration diagram showing a fixed part and an interference prevention part of a cable junction box for a communication line for easy connection in a building.

1 to 4, a cable junction box for a communication line for easy connection in a building according to an embodiment of the present invention has a transparent window 12 installed with an opening in the front, and a first opening on one side thereof. (14) is provided, the cabinet 10 provided with the second opening 16 on the other side, and the first opening 14 is installed to be openable and closed, and a plurality of first installation holes 17a are formed. The first side cover 17 and the second side cover 18, which is installed to be openable and closed at the second opening 16, and in which a plurality of second installation holes 18a are formed, and the first side cover 17 It is integrally installed in the first connection block 50 and electrically connected to the lead-in cable 58 inserted through the first installation hole 17a, and integrally installed in the second side cover 18, and 2 The second connection block 70 electrically connected to the lead-out cable 78 inserted through the installation hole 18a, and installed inside the cabinet 10, and the first side cover 17 is closed so that the first When the connection block 50 is inserted into the cabinet 10, it is electrically connected to the first connection block 50, and the second side cover 18 is closed so that the second connection block 70 is inside the cabinet 10. When inserted into the connection terminal 30, which is electrically connected to the second connection block 70 and electrically connects the lead cable 58 and the lead cable 78, and the lead cable inserted into the first installation hole 17a (58) or between the first connection block 50 or the second connection block 70 and the lead cable 58 or the lead cable 78 by restraining the lead cable 78 inserted into the second installation hole 18a Interference between the fixing part 80 that prevents the electrical connection of the device from being released, the release lever 88c releasing the operation of the fixing part 80 and the first side cover 17 or the second side cover 18 It includes an interference prevention unit 90 to prevent the.

Therefore, when the lead-in cable 58 or the lead-out cable 78 is electrically connected inside the cabinet 10, the lead-in cable 58 is inserted into the first installation hole 17a and faces the first installation hole 17a. When the lead cable 78 is inserted into the second installation hole 18a, the power or electrical signal transmitted by the lead cable 58 is transferred to the first connection block 50, the connection terminal 30, and the second connection block 70. ) Is transmitted to the lead-out cable (78).

The connection terminal 30 according to the present embodiment includes a plurality of first pin terminals 34 and a second connection block 70 provided on one side of the connection terminal 30 so as to be inserted into the first connection block 50. The connection terminal 30 is connected to electrically connect a plurality of second pin terminals 36 provided on the other side of the connection terminal 30 to be inserted, and the first pin terminal 34 and the second pin terminal 36. It includes a conductor member 32 installed so as to cross.

Therefore, the first pin terminal 34 is inserted into the first connection block 50 to which the lead cable 58 is electrically connected, and the second connection block 70 to which the lead cable 78 is electrically connected. ), since the second pin terminal 36 is inserted and electrically connected, the lead-in cable 58 and the lead-out cable 78 can be electrically connected by the connection terminal 30.

The first connection block 50 of the present embodiment includes a first through hole 52 formed across the first connection block 50 so as to be connected to and communicated with the first installation hole 17a, and a first through hole ( 52) so that the end of the lead-in cable 58 is inserted from one end of the first passage hole 52 to be electrically connected to the first terminal groove 54 and the first terminal groove 54 to be electrically connected. It is installed in the first through hole 52 in close contact, and a first pin terminal 34 inserted from the other end of the first through hole 52 is inserted and electrically connected to the second terminal groove 56.

Therefore, the end of the lead-in cable 58 inserted from one end of the first through hole 52 through the first installation hole 17a is inserted into the first terminal groove 54 to be electrically connected, and the first through hole 52 ) Since the first pin terminal 34 inserted from the other end is inserted into the second terminal groove 56 and is electrically connected, the lead-in cable 58 and the connection terminal 30 are electrically connected.

In addition, the second connection block 70 includes a second through hole 72 formed across the second connection block 70 and a second through hole 72 so as to be connected to and communicated with the second installation hole 18a. ), the end of the lead cable 78 is inserted from one end of the second passage hole 72 and is electrically connected to the third terminal groove 74 and the third terminal groove 74 so that the end of the cable is electrically connected to each other in close contact. The second pin terminal 36 is installed in the second passage hole 72 and inserted from the other end of the second passage hole 72 and includes a fourth terminal groove 76 that is electrically connected.

Therefore, the end of the lead cable 78 inserted from one end of the second through hole 72 through the second installation hole 18a is inserted into the third terminal groove 74 to be electrically connected, and the second through hole 72 ) Since the second pin terminal 36 inserted from the other end is inserted into the fourth terminal groove 76 and electrically connected, the lead cable 78 and the connection terminal 30 are electrically connected.

Since the first pin terminal 34 and the second pin terminal 36 installed on both sides of the connection terminal 30 are electrically connected by the conductor member 32 installed in the connection terminal 30, the lead-in cable 58 And the lead cable 78, the first terminal groove portion 54, the second terminal groove portion 56, the first pin terminal 34, the conductor member 32, the second pin terminal 36, the fourth terminal groove portion It is electrically connected to the lead-out cable 78 through the 76 and the third terminal groove 74.

When separating the lead-in cable (58) or the lead-out cable (78) from the junction box, the first side cover (17) or the second side cover (18) is separated from the cabinet 10 and opened. By releasing the restraint state, the lead-in cable 58 or the lead-out cable 78 can be separated from the first connection block 50 or the second connection block 70.

The fixing part 80 of the present embodiment is partially protruding from the inner wall of the first through hole 52 or the second through hole 72 opposite to the first installation hole 17a or the second installation hole 18a and can be rotated. The first fixed gear 82 that is installed so that it is partially protruded from the inner wall of the first through hole 52 or the second through hole 72 opposite to the first installation hole 17a or the second installation hole 18a. The second fixed gear 84 and the first fixed gear 82 or the second fixed gear 84 are rotatably installed and disposed opposite to the first fixed gear 82 and are rotatable in the forward direction and reverse direction. The first passage hole 52 or the second passage hole 72 by releasing the fixed state of the restraining portion 86 and the restraining portion 86 so as not to rotate. It includes a release unit 88 to be separated outward.

Therefore, when the lead-in cable 58 or the lead-out cable 78 is inserted into the first passage hole 52 or the second passage hole 72, the gap between the first fixed gear 82 and the second fixed gear 84 The cable is inserted. At this time, the first fixed gear 82 and the second fixed gear 84 are in a state that can rotate in the forward direction, so the first fixed gear 82 and the second fixed gear 84 are rotated while the cable is inserted. do.

Thereafter, when the lead-in cable 58 or the lead-out cable 78 is pulled out of the first passage hole 52 or the second passage hole 72, the first fixed gear 82 by the operation of the restraint portion 86 Alternatively, the second fixed gear 84 is not rotated in the reverse direction, and the gear teeth formed on the circumferential surface of the first fixed gear 82 or the second fixed gear 84 rub with the cable, and the lead-in cable 58 or the lead-out cable ( 78) is prevented from being separated to the outside of the first passage hole 52 or the second passage hole 72.

The restraint part 86 of this embodiment is gear-connected with the gear teeth of the first fixed gear 82 or the second fixed gear 84, and has an inclined surface formed on one side of the first fixed gear 82 or the second fixed gear. When the gear 84 is rotated in the forward direction, the gear teeth slide on the inclined surface to rotate the first fixed gear 82 or the second fixed gear 84, and the first fixed gear 82 or the second fixed gear 84 When is rotated in the reverse direction, the locking hook 86a interfering with the gear teeth of the first fixed gear 82 or the second fixed gear 84, and the locking hook 86a are connected to the first fixed gear 82 or the second fixed gear. It includes an elastic member (86b) that provides an elastic force pressing toward the fixed gear (84).

Therefore, when the first fixed gear 82 or the second fixed gear 84 is rotated in the forward direction, the gear teeth of the first fixed gear 82 or the second fixed gear 84 slide along the inclined surface of the locking hook 86a. Without interference, when the first fixed gear 82 or the second fixed gear 84 is rotated in the reverse direction, the locking hook 86a interferes with the gear teeth of the first fixed gear 82 or the second fixed gear 84 As a result, it is possible to prevent the cable from being discharged.

Here, the forward direction of the first fixed gear 82 and the second fixed gear 84 is when the cable is inserted into the first through hole 52 or the second through hole 72, the first fixed gear 82 and the second fixed gear. 2 It means a direction in which the fixed gear 84 is rotated, and the positive direction of the first fixed gear 82 and the positive direction of the second fixed gear 84 form opposite directions.

In addition, the release part 88 of this embodiment includes a release wire 88a extending outward from the rear of the locking hook 86a to the outside of the first side cover 17 or the second side cover 18, and the release wire 88a. While bending the moving direction of the release wire (88a) a plurality of guide rollers (88b) guiding to one side of the first side cover (17) or the second side cover (18), and at the outer end of the release wire (88a). It includes a connected release lever (88c).

The release lever 88c of this embodiment is a release wire 88a disposed on one side of the first side cover 17 or the second side cover 18 and installed on the first fixed gear 82 side, and the second A release wire 88a installed on the side of the fixed gear 84 is simultaneously connected to one release lever 88c.

Therefore, when one release lever (88c) is pulled to the outside of the side cover, the elastic member (86b) is compressed and the locking hook (86a) geared to the first fixed gear (82) and the second fixed gear (84) As the locking hook (86a) is retracted at the same time, the restraint of the first fixed gear 82 and the second fixed gear 84 is released, so that the operator can enter the cable from the first passage hole 52 or the second passage hole 72. 58) or the lead cable 78 can be easily separated.

In addition, the interference prevention unit 90 of this embodiment includes a prevention groove 92 formed on one side of the first side cover 17 or the second side cover 18 to accommodate the release lever 88c. .

The release wire 88a extending from the side of the first fixed gear 82 and the release wire 88a extending from the side of the second fixed gear 84 are prevented from being bent in the traveling direction by a plurality of guide rollers 88b. A pair of release wires 88a are connected to the release lever 88c extending toward the groove portion 92 and accommodated in the prevention groove portion 92.

Therefore, when the operator pulls the release wire 88a from the prevention groove 92 in an outward direction, the pair of release wires 88a is pulled and the pair of locking hooks 86a is retracted to retreat the first fixed gear 82 and 2 It is possible to release the restrained state of the fixed gear 84 at the same time.

In addition, when the first side cover 17 or the second side cover 18 is closed toward the cabinet 10, the prevention groove 92 formed on the side of the first side cover 17 or the second side cover 18 Since the release lever 88c is in a housed state, it is possible to prevent a malfunction in which the release lever 88c and the cabinet 10 interfere with each other and pull the release wire 88a differently from the intention of the operator.

Here, the unexplained reference numeral 38 denotes a display unit 38 that indicates whether the lead cable 58 and the lead cable 78 are electrically connected or disconnected or not while being lit.

Accordingly, the lead-in cable and the lead-out cable can be installed to be connected to the terminal box without a separate fastening member, and the lead-in cable or lead-out cable can be installed by opening and closing only the side cover without opening the entire terminal box. It is possible to provide a cable junction box for a communication line that facilitates wiring in a building that can prevent the cable or outgoing cable from being separated from the terminal box or the part to which the incoming cable or outgoing cable is connected to be deformed or damaged.

The present invention has been described with reference to one embodiment shown in the drawings, but this is only exemplary, and various modifications and other equivalent embodiments are possible from those of ordinary skill in the field to which the technology belongs. Will understand.

In addition, the description has been made with an example of a cable junction box for a communication line that is easy to connect in a building, but this is only an example, and the junction box of the present invention is applied to other products other than a cable junction box for a communication line that is easy to connect in a building. Can be used.

Therefore, the true technical protection scope of the present invention should be determined by the following claims.

10: cabinet 12: transparent window
14: first opening 16: second opening
17: first side cover 18: second side cover
30: connection terminal 32: conductor member
34: first pin terminal 36: second pin terminal
38: display unit 50: first connection block
52: first passage hole 54: first terminal groove
56: second terminal groove 70: second connection block
72: first through hole 74: third terminal groove
76: fourth terminal groove portion 80: fixed portion
82: first fixed gear 84: second fixed gear
86: restraint part 88: release part
90: interference prevention unit 92: prevention groove

Claims (4)

A cabinet having a front opening to install a transparent window, a first opening on one side, and a second opening on the other side;
A first side cover installed in the first opening to be opened and closed and having a plurality of first installation holes formed therein;
A second side cover installed to be opened and closed at the second opening and having a plurality of second installation holes formed therein;
A first connection block integrally installed on the first side cover and electrically connected to a lead-in cable inserted through the first installation hole;
A second connection block integrally installed in the second side cover and electrically connected to a lead cable inserted through the second installation hole;
It is installed inside the cabinet, and when the first side cover is closed and the first connection block is inserted into the cabinet, it is electrically connected to the first connection block, and the second side cover is closed and the second connection A connection terminal electrically connected to the second connection block when the block is inserted into the cabinet to electrically connect the lead cable and the lead cable;
Electrical connection between the first connection block or the second connection block and the lead cable or the lead cable by restraining the lead cable inserted in the first installation hole or the lead cable inserted in the second installation hole A cable connection box for a communication line for easy connection in a building, characterized in that it includes a fixing part that prevents this from being released.
The method of claim 1, wherein the connection terminal,
A plurality of first pin terminals provided on one side of the connection terminal to be inserted into the first connection block;
A plurality of second pin terminals provided on the other side of the connection terminal to be inserted into the second connection block; And
A cable connection box for a communication line for easy connection in a building, comprising: a conductor member installed across the connection terminal to electrically connect the first pin terminal and the second pin terminal.
The method of claim 2, wherein the first connection block,
A first passage hole formed across the first connection block to communicate with and communicate with the first installation hole;
A first terminal groove installed in the first passage hole and electrically connected by inserting an end of the lead-in cable from one end of the first passage hole; And
And a second terminal groove provided in the first through hole so as to be in close contact with the first terminal groove and electrically connected by inserting the first pin terminal inserted from the other end of the first through hole. A cable connection box for communication lines for easy connection in a building, characterized in that.
The method of claim 3, wherein the second connection block,
A second passage hole formed across the second connection block to communicate with and communicate with the second installation hole;
A third terminal groove installed in the second passage hole and electrically connected by inserting an end of the lead cable from one end of the second passage hole; And
And a fourth terminal groove provided in the second passage hole so as to be in close contact with the third terminal groove and electrically connected to the second pin terminal inserted from the other end of the second passage hole. A cable connection box for communication lines for easy connection in a building, characterized in that.

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