KR102207742B1 - Information and communication upgrade system for apartment houses - Google Patents

Abstract

The present invention relates to an information and communication upgrade system of an apartment house which installs a WiFi extender having internal and external antennas in a door to increase a sensitivity of a WiFi reception in all spaces such as a living room, a bedroom, and the like, so that information and communication of the apartment house can be upgraded. Since the WiFi extender having internal and external antennas is used, even if the door to the bedroom and a computer room is closed, specifically, when the door to the computer room in which a wireless router is installed, the sensitivity of the Wi-Fi reception can be improved in all spaces such as the living room, the bedroom, and the like. Moreover, the WiFi extender does not protrude from the walls of the living room, the computer room, the bedroom, and the like, thereby having no restriction on the arrangements of the furniture and home appliances which are attached to the walls of the living room, the computer room, the bedroom, and the like.

Description

Information and communication upgrade system for apartment houses}

The present invention relates to an information and communication upgrade system of an apartment house, among the technologies in the communication field, and more specifically, to increase the sensitivity of Wi-Fi reception in all spaces such as living room and bedroom, and in a state in which visits to bedrooms and computer rooms are closed, in particular Even if you close your visit to the computer room where the wireless router is installed, you can increase the sensitivity of Wi-Fi reception in all spaces such as living room and bedroom. It relates to an information and communication upgrade system of an apartment house that does not limit the arrangement of furniture and home appliances used.

In general, apartment houses such as apartments are a living room (LR) and a computer room by means of the entrance wall (W1) of the entrance (EN) and the wall (W2) constructed following the entrance wall (W1). It is divided into internal spaces including (RC), bedrooms (R1, R2), kitchen (KC), toilet (BR), and balcony (BC).

In general, as a method of utilizing information and communication in an apartment house, a computer is installed, connected to a wired Internet network, and a wireless router is connected so that the mobile terminal can use Wi-Fi.

However, it is customary to install a computer in one of several bedrooms, and a wireless router is also installed in a bedroom where a computer is installed. In other bedrooms and living rooms, Wi-Fi reception sensitivity decreases, making Wi-Fi use inconvenient.

On the other hand, as a prior art related to the information and communication system of apartment houses, Korean Patent Laid-Open Publication No. 10-2004-0054841 (published on June 26, 2004) "Household information communication remodeling household terminal box" (hereinafter referred to as'prior technology 1') ).

The prior art 1 can be simply installed in an outlet box installed on an existing wall, so it is possible to save working time, and to prevent noise, dust, vibration, etc. during installation work, it is formed in a box shape, A body having a first coupling hole and a second coupling hole formed corresponding to the fixing holes of the fixing protrusions formed on the top and bottom of the outlet box, and one side of the body with a wiring hole formed in one part of the rear surface corresponding to the box. A plate-shaped plate having a width smaller than the width of the wiring hole, each having a fastening hole formed at a position corresponding to the first and second coupling holes of the body, the cover on which the corners are rotatably coupled to open and close and the locking device is installed A pair of fixing bolts that pass through the fixing plate of the top and the fixing hole of the fixing plate and the first and second coupling holes of the body and fastened to the fixing holes of the outlet box to fix and support the body to the outlet box, and installed on one side of the body Disclosed is a household terminal box for remodeling the information and communication of apartment houses including a modular jack.

However, the prior art 1 does not solve the above-described problems in applying to old apartment houses.

In addition, the prior art related to the multi-family terminal box for information and communication remodeling is disclosed in Korean Patent Registration No. 10-1187783 (registered on September 26, 2012) "Household integrated terminal box" (hereinafter, referred to as'prior technology 2').

The prior art 2 is a case body having an open front side and closed top and bottom surfaces, and both sides and back sides, the upper part forming an electric line arrangement space, and the lower part divided into a communication line arrangement space; In order to reduce the formation of water droplets in the case body, a water droplet formation prevention part formed of a plurality of protrusions and grooves integrally formed on the back side of the case body can be installed by integrating a dedicated electric line and a dedicated communication line installed in a building into a terminal box. In order to ensure that mutual interference between wiring inside the terminal box is minimized, it is possible to prevent communication line abnormalities due to electric leakage and magnetic field in advance, and by preventing condensation inside the terminal box and suppressing condensation of water droplets, electrical stability and line failure due to corrosion and electric leakage are reduced. Disclosed is a household integrated terminal box to prevent this.

However, in applying the prior art 2 to an old apartment house, the above-described problem cannot be solved.

In addition, a prior art for solving such a conventional problem is disclosed in Korean Patent Registration No. 10-1749649, "a unit housing household terminal box device for information communication remodeling" (hereinafter, referred to as'prior art 3').

In the prior art 3, the Internet modem and the first wired/wireless router are installed in the household terminal box, and the first LAN cable connected to the Internet connection line is drawn out to the household terminal box through the power distribution line buried in the wall and connected to the Internet modem. Connect the first wired/wireless router with a second LAN cable, install a third LAN cable through the wall between the front door and the computer room, and connect the fourth LAN cable connected to the third LAN label to the second wired/wireless router. 2 By connecting the LAN card of the wired/wireless router and the computer with the 5th LAN cable, construction is possible without any difficulty, excluding the LAN cable wired to the outside along the wall and ceiling, and the first LAN cable, the second LAN cable, and the third Since all LAN cables are not exposed to the outside and are buried in the wall and ceiling, there is no harm to the interior aesthetics, and the first wired/wireless router is installed in the household terminal box installed at the entrance side connected to the living room. Since the second wired/wireless router is installed, the reception sensitivity of Wi-Fi signals is improved not only in a computer room but also in a living room, so that household members can conveniently enjoy the Internet or SNS using a mobile communication terminal.

However, in the prior art 3, an internet modem and a first wired/wireless router are installed in the household terminal box buried in the entrance wall to improve the reception sensitivity of Wi-Fi signals in the living room, but a second wired/wireless router installed in a computer room. There is a problem in that the operation becomes cumbersome because the LAN cable for connecting to the first wired/wireless router must be connected by a LAN cable that is wired through a connection channel inserted into a hole drilled in the wall.

In addition, even if the reception sensitivity of the Wi-Fi signal in the living room and the computer room is increased by this method, there is a problem that the sensitivity of the Wi-Fi signal reception in the master room and other bedrooms cannot be increased.

In addition, when a middle door is installed between the entrance and the living room, there is a problem in that it is impossible to increase the reception sensitivity of the Wi-Fi signal in the living room and the bedroom.

Therefore, recently, a Wi-Fi expander (WX) has been installed in the living room (LR), computer room (RC), and bedroom (R1, R2) to receive and transmit Wi-Fi signals transmitted from wired/wireless routers in the computer room (RC). By doing so, we are using a method of expanding the Wi-Fi reception area.

The Wi-Fi expander has the advantage of being convenient to install and use because the installation is completed simply by plugging it into the power outlet of the living room (LR), computer room (RC), and bedroom (R1, R2).

However, even if the Wi-Fi expander (WX) is installed, the computer room (RC) and bedrooms (R1, R2) are closed, especially when the computer room (RC) where the wireless router (WR) is installed is closed. Since signal transmission and reception are not performed smoothly, there is a problem in that the effect is deteriorated.

In addition, the Wi-Fi expander (WX) is installed by inserting it into a power outlet installed on the wall, and since it protrudes from the wall, there is a problem that it places restrictions on the arrangement of furniture and home appliances used by attaching it to the walls of living rooms, computer rooms, and bedrooms. .

Republic of Korea Patent Publication No. 10-2004-0054841 (published on June 26, 2004) "Household terminal box for information communication remodeling" Korean Patent Registration No. 10-1187783 (registered on September 26, 2012) "Household integrated terminal box" Republic of Korea Patent Registration No. 10-1749649 "Multi-unit housing household terminal box device for information and communication remodeling"

Accordingly, an object of the present invention is to provide an information communication upgrade system for an apartment house to increase the sensitivity of Wi-Fi reception in all spaces such as a living room and a bedroom.

Another object of the present invention is to provide an information and communication upgrade system of an apartment house to increase the sensitivity of Wi-Fi reception in all spaces such as living room and bedroom even when the visit of the bedroom and the computer room is closed, in particular, even when the visit of the computer room equipped with a wireless router is closed. To provide.

Another object of the present invention is to prevent the Wi-Fi expander from protruding from the walls of the living room, computer room, and bedroom so that it does not restrict the arrangement of furniture and home appliances used by attaching it to the walls of the living room, computer room, and bedroom. It is to provide an information communication upgrade system of

In order to achieve the above object, the present invention is installed in a door frame installed on a wall in a door frame, and includes inner and outer plates inside and outside the square frame, and a wireless router is installed in the computer room. In things,

Wifi expanders are installed using inner and outer expander holders in the inner and outer installation holes formed on the inner and outer plates,

The Wi-Fi expander includes an expander body having the same thickness as the inner spacing of the visited outer plate, a WPS button provided on an inner surface of the expander body, an inner and outer antenna provided on the inner and outer surfaces of the expander body, and the Includes a plug provided on the lower surface of the expander body and facing the inner surface of the plug terminal,

The inner expander holder is inserted into the inner installation hole, the inner holder body with the inner and outer surfaces opened, and the inner holder body extended to the outside at the inner end of the inner holder body to be in close contact with the inner side of the inner plate around the inner installation hole. An inner outer flange, an inner inner flange formed to be expanded inward at an inner end of the inner holder body to close contact with the inner side of the expander body, a plurality of screw insertion bosses formed on the outer peripheral surface of the inner holder body, and the inner side It includes a countersinking bore formed coaxially with the threaded boss on the outer flange,

The outer expander holder is inserted into the outer mounting hole, the outer holder body with the inner and outer surfaces open, and the outer holder body extended to the outside at the outer end of the outer holder body to be in close contact with the outer surface of the outer plate around the outer mounting hole. It includes an outer outer flange, an outer inner flange formed to be expanded inward at an outer end of the outer holder body to close the outer surface of the expander body, and a plurality of screw fastening bosses formed on the outer peripheral surface of the outer holder body,

The inner and outer dilator holders are fixedly installed on the door by fastening a countersunk head screw inserted through the countersinking bore and the screw insertion boss to the screw fastening boss,

The inner holder body is provided with an outlet having an outlet terminal corresponding to the plug terminal of the plug, and a cord is connected to the outlet,

The cord extends through the corner between the door frame and the wall to the location where the power outlet installed on the wall is installed,

It is covered with a cord to prevent disconnection when opening or closing the door, and further includes a cord bushing having one end fixed to the inner plate and the other end attached to the inner side of the door frame,

The code bushing is formed in a D-shaped cross section having an arc part and a flat part, and one end is inserted into the bushing fixing hole formed on the inner plate and fixed to the door, and the other end is attached and fixed to the inner surface of the door frame by double-sided tape. It provides an information and communication upgrade system of an apartment house as a feature.

According to the information communication upgrade system of an apartment house of the present invention, a WiFi expander having internal and external antennas is installed at a visit to increase the sensitivity of WiFi reception in all spaces such as a living room and a bedroom, thereby upgrading information communication in the apartment house.

According to the information communication upgrade system of the apartment house of the present invention, since the Wi-Fi expander having inner and outer antennas is used, the visit to the bedroom and the computer room is closed, and in particular, even if the visit to the computer room equipped with a wireless router is closed, all spaces such as living room and bedroom You can increase the sensitivity of Wi-Fi reception.

According to the information communication upgrade system of the apartment house of the present invention, since the Wi-Fi expander does not protrude from the walls of the living room, computer room, and bedroom, it is not possible to place restrictions on the arrangement of furniture and home appliances used by attaching to the walls of the living room, computer room, and bedroom. Will not be.

1 to 6 show a preferred embodiment of an information communication upgrade system of an apartment house according to the present invention,
1 is a plan view showing a wall and an interior space of an apartment house, a wireless router, and a Wi-Fi expander;
2 is an exploded perspective view of a door, a door frame, an inner and outer expander holder, and a WiFi expander,
3 is a perspective view of a state in which a Wi-Fi expander is installed at a visit from the inside of a computer room and a bedroom,
4 is a perspective view of a computer room (RC), a view from the outside of a bedroom, showing a state in which a Wi-Fi expander is installed in a visit
5 is a longitudinal sectional view showing a state in which a Wi-Fi extender is installed in a visit,
6 is a cross-sectional view showing a state in which a Wi-Fi extender is installed in a visit,
7 is a plan view showing a wall and an interior space, a wireless router, and a Wi-Fi expander of a conventional apartment house.

Hereinafter, an information communication upgrade system for an apartment house according to the present invention will be described in detail according to a preferred embodiment illustrated in the accompanying drawings.

1 to 6 show a preferred embodiment of an information communication upgrade system of an apartment house according to the present invention.

The information communication upgrade system of the apartment house according to the present embodiment, as shown in Figs. 1 to 6, each computer room (RC), the visit 10 of the bedrooms (R1, R2), a Wi-Fi expander 100 in the upper middle When the visitor 10 is opened, as well as when it is closed, the Wi-Fi reception sensitivity is improved in the computer room (RC) and bedrooms (R1, R2) as well as the living room (LR).

The door 10 is installed on the door frame 20 installed on the wall W2 in the same way as a normal door, and has a structure in which a square frame 13 is coupled between the inner and outer plates 11 and 12. .

The door 10 is installed on the door frame 20 in a hinged manner by a hinge (not shown).

The Wi-Fi expander 100 includes an expander body 110 having a thickness equal to the inner spacing of the inner and outer plates 11 and 12 of the visitor 10, and a WPS button provided on the inner surface of the expander body 110 (121), the inner and outer antennas 130 and 140 provided on the inner and outer surfaces of the expander body 110, and the plug terminal 151 provided on the lower surface of the expander body 110 Includes a facing plug 150.

Since various expander components are built into the expander body 110, detailed illustrations and descriptions thereof will be omitted.

The WPS button 121 refers to a Wi-Fi Protected Setup (WPS) button, and sets the Wi-Fi extender 100 to be paired with a wireless router.

That is, the Wi-Fi extender 100 may connect to the wireless router by pressing the WPS button of the wireless router and then pressing the WPS button 120 of the Wi-Fi expander 100.

In addition, the WiFi expander 100 includes a frequency selection button 122 for selecting a frequency (2.4GHz or 5GHz), a power button 123 and a reset button 124.

The inner and outer antennas 130 and 140 may be installed to be angle adjustable.

The Wi-Fi expander 100 is visited by the inner and outer expander holders 300 and 400 inserted in the inner and outer installation holes H1 and H2 formed in the inner and outer plates 11 and 12 of the visitor 10 It is fixed at (10).

The inner and outer expander holders 300 and 400 may be formed of synthetic resin.

The inner expander holder 300 is inserted into the inner mounting hole H1, and the inner holder body 310 with the inner and outer surfaces opened, and the inner holder body 310 extended to the outside to the inner side The inner outer flange 320 in close contact with the inner surface of the inner plate 11 around the installation hole H1, and the inner end of the inner holder body 310 are formed to expand to the inside of the expander body 110 The inner inner flange 330 to which the side is in close contact, a plurality of screw insertion bosses 340 formed on the outer peripheral surface of the inner holder body 310, and the screw insertion boss 340 on the inner outer flange 320 It includes a counter sinking bore 350 formed coaxially.

The outer expander holder 400 is inserted into the outer mounting hole (H2) and the outer holder body 410 with the inner and outer surfaces open, and the outer holder body 410 extended to the outside to the outside The outer outer flange 420 in close contact with the outer surface of the outer plate 12 around the installation hole H2 and the outer end of the outer holder body 410 are formed to expand to the outside of the expander body 110 It includes an outer inner flange 430 to which the side is in close contact, and a plurality of screw fastening bosses 440 formed on the outer circumferential surface of the outer holder body 410.

The inner and outer expander holders 300 and 400 are visited by fastening the countersinking bore 350 and the countersunk head screw 450 inserted through the screw insertion boss 340 to the screw fastening boss 440 It is fixedly installed in (10).

The screw insertion boss 340 and the screw fastening boss 440 are formed to be in close contact with the inner circumferential surfaces of the inner and outer installation holes H1 and H2, and when opening and closing the visit 10, the inner and outer expander holder 300, It is desirable to configure so that 400) does not shake.

In addition, an outlet 360 having an outlet terminal 361 corresponding to the plug terminal 151 of the plug 150 is provided on the inner holder body 310, and a cord 370 is connected to the outlet 360 do.

The outlet 360 may be installed on the upper surface of the lower plate 311 forming the inner holder body 310. In addition, a cord passage hole H3 through which the cord 370 passes is formed in the lower plate 311.

The cord 370 may extend to a location where a power outlet (not shown) installed on the wall W2 is installed through a corner portion between the door frame 20 and the wall W2.

Here, the end of the cord 370 may be installed without a plug, and when the installation is completed, a plug inserted into the power outlet may be connected to the end of the cord 370.

The cord 370 is covered on the cord 370 to prevent disconnection when opening and closing the door 10, one end is fixed to the inner plate 11 and the other end is attached to the inner surface of the door frame 20 Can be protected by 380.

The code bushing 380 is formed in a D-shaped cross section having an arc portion 381 and a flat portion 382, and one end is inserted into the bushing fixing hole H4 formed in the inner side plate 11 to be inserted into the landing 10. The other end may be fixed by attaching the flat portion 382 to the inner surface of the door frame 20 by double-sided tape.

Hereinafter, a process of installing an information communication upgrade system for an apartment house according to the present invention will be described.

In the state that the plug is not connected to the end of the cord 370, through the space between the inner installation hole (H1) and the inner and outer plates (11, 12) in the computer room (RC) and bedrooms (R1, R2). Inserted into the bushing fixing hole (H4) so that the cord 370 and the cord bushing 380 are drawn out to the inside of the inner plate (11).

At this time, the inner end of the code bushing 380 is inserted into the bushing fixing hole H4 to be fixed.

In addition, the cord 370 is prepared to have an extra length so that the inner holder 300 can be inserted into the inner installation hole H1 even when the inner end of the cord bushing 380 is fixed to the bushing fixing hole H4. do.

In the inside of the computer room (RC) and bedrooms (R1, R2), the inner holder body 310 is inserted into the inner mounting hole H1 of the inner plate 11 so that the inner outer flange 320 is Make sure to stick to the inner side.

By attaching the flat portion 382 of the outer end of the code bushing 380 to the inner surface of the door frame 20 using double-sided tape, the code bushing 380 is connected to the inner plate 11 and the door frame 20 of the door 10. ) Between them.

On the other hand, by inserting the Wi-Fi expander 100 into the outer holder body 410 of the outer expander holder 400 at the outside of the computer room (RC) and bedrooms (R1, R2), the outer edge of the expander body 110 It should be in close contact with the inner surface of the inner flange 430.

Outside the computer room (RC) and bedrooms (R1, R2) by inserting the outer holder body 410 into which the Wi-Fi expander 100 is inserted into the outer mounting hole (H2) of the outer plate 12 to the outer outer flange 420 ) Is in close contact with the outer surface of the outer plate 12.

At this time, in the dilator body 110, the outer half is inserted into the outer holder body 410, and the inner half protrudes from the inner end of the outer holder body 410, so the inner cut portion of the expander body 110 It is inserted into the inner holder body 310 so that the inner surface is in close contact with the outer surface of the inner inner flange 330.

In this state, by inserting the flat head screw 350 into the screw insertion boss 340 through the countersinking bore 350 of the inner expander holder 300 and fastening it to the screw fastening boss 440, the inner and outer expander holders (300, 400) are combined with the inner and outer plates 11 and 12 of the visit 10 in between, and the WiFi expander 100 is fixed in a state inserted between the inner and outer holder bodies 310 and 410 do.

At this time, since the outer circumferential surfaces of the screw insertion boss 340 and the screw fastening boss 440 come into contact with the inner circumferential surfaces of the inner and outer installation holes H1 and H2, the inner and outer expander holders 300 and 400 to open and close the visitor 10 ) Can be installed in a state that does not shake within the inner and outer installation holes (H1, H2).

In addition, the Wi-Fi expander 100 is in close contact with the inner and outer inner flanges 330 and 430 of the inner and outer expander holders 300 and 400 so that the Wi-Fi expander 100 does not shake when the visitor 10 is opened or closed. Can be installed safely with.

Finally, connect a power plug (not shown) to the end of the cord 370, insert it into a power outlet (not shown) installed on the wall (W2), and press the power button 123 to power the Wi-Fi expander 100. Be supplied.

Then, by pressing the WPS button 121, the Wi-Fi extender 100 is paired with the wireless router.

At this time, the frequency is selected as 2.4GHz or 5.0GHz using the frequency selection button 122.

In addition, when pairing is not performed smoothly, the reset button 124 is pressed to perform pairing.

In this way, when the installation of the Wi-Fi expander 100 for the visit 10 is completed, and the Wi-Fi expander 100 is paired with the wireless router and the visit 10 is closed, the inner antenna 130 is connected to the wireless router. The signal is received, and the inner and outer antennas 130 and 140 transmit the WiFi signal, so that the WiFi signal is expanded inside and outside the computer room RC and the bedrooms R1 and R2, thereby improving the WiFi reception sensitivity.

In addition, when the visitor 10 is open, the inner and outer antennas 130 and 140 receive Wi-Fi signals from the wireless router, and the inner and outer antennas 130 and 140 transmit Wi-Fi signals to the computer room (RC). Wi-Fi signals are expanded inside and outside the bedrooms R1 and R2 to improve Wi-Fi reception sensitivity.

On the other hand, the living room (LR) does not have a Wi-Fi expander 100 installed, but the Wi-Fi expander 100 is installed in the computer room (RC) and the visit (10) of the bedrooms (R1, R2), and the outer antenna (140) Since the Wi-Fi signal is extended and transmitted in the living room (LR), Wi-Fi reception sensitivity is improved.

Accordingly, Wi-Fi reception sensitivity in the computer room (RC), bedrooms (R1, R2), and living room (LR) is improved, so that Wi-Fi within the household can be conveniently used, thereby upgrading information and communication in apartment houses.

In addition, the Wi-Fi expander 100 is installed in the visitor 10 and does not protrude from the walls (W2) of the living room (LR), computer room (RC), and bedrooms (R1, R2), so the living room (LR), computer room (RC) And it does not impose restrictions on the arrangement of furniture and home appliances used by attaching to the walls of the bedrooms R1 and R2.

Although the examples have been described above, the present invention is not limited to the above-described embodiments, and those of ordinary skill in the technical field to which the present invention belongs without departing from the gist of the invention as claimed in the following claims. Anyone can implement various modifications, so it will be said that such modifications also belong to the technical idea of the present invention.

10: visit 11, 12: inner, outer plate
H1, H2: installation hole 20: door frame
100: wifi expander 110: expander body
121: WPS button 130, 140: inner, outer antenna
150: plug 151: plug terminal
300, 400: inner and outer expander holder
310, 410: inner and outer holder body
320, 420: inner, outer outer flange
330, 430: inner, outer inner flange
340: screw insertion boss 440: screw tightening boss
350: counter sinking bore 360: outlet
361: outlet terminal 370: cord
380: cord bushing 450: flat head screw

Claims (1)

In the computer room and the bedroom door is installed in a door frame installed on the wall in an opening and closing type, and includes inner and outer plates on the inside and outside of the square frame, and a wireless router is installed in the computer room,
Wifi expanders are installed in the inner and outer installation holes formed on the inner and outer plates using inner and outer expander holders,
The Wi-Fi expander includes an expander body having the same thickness as the inner spacing of the visited outer plate, a WPS button provided on an inner surface of the expander body, an inner and outer antenna provided on the inner and outer surfaces of the expander body, and the Includes a plug provided on the lower surface of the expander body and facing the inner surface of the plug terminal,
The inner expander holder is inserted into the inner installation hole, the inner holder body with the inner and outer surfaces opened, and the inner holder body extended to the outside at the inner end of the inner holder body to be in close contact with the inner side of the inner plate around the inner installation hole. An inner outer flange, an inner inner flange formed to be expanded inward at an inner end of the inner holder body to close contact with the inner side of the expander body, a plurality of screw insertion bosses formed on the outer peripheral surface of the inner holder body, and the inner side It includes a countersinking bore formed coaxially with the threaded boss on the outer flange,
The outer expander holder is inserted into the outer mounting hole, the outer holder body with the inner and outer surfaces open, and the outer holder body extended to the outside at the outer end of the outer holder body to be in close contact with the outer surface of the outer plate around the outer mounting hole. It includes an outer outer flange, an outer inner flange formed to be expanded inward at an outer end of the outer holder body to close the outer surface of the expander body, and a plurality of screw fastening bosses formed on the outer peripheral surface of the outer holder body,
The inner and outer dilator holders are fixedly installed on the door by fastening a countersunk head screw inserted through the countersinking bore and the screw insertion boss to the screw fastening boss,
The inner holder body is provided with an outlet having an outlet terminal corresponding to the plug terminal of the plug, and a cord is connected to the outlet,
The cord extends through the corner between the door frame and the wall to the location where the power outlet installed on the wall is installed,
It is covered with a cord to prevent disconnection when opening or closing the door, and further includes a cord bushing having one end fixed to the inner plate and the other end attached to the inner side of the door frame,
The code bushing is formed in a D-shaped cross section having an arc part and a flat part, and one end is inserted into the bushing fixing hole formed on the inner plate and fixed to the door, and the other end is attached and fixed to the inner surface of the door frame by double-sided tape. Information and communication upgrade system of apartment houses characterized by.

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