KR20080093729A - Automatic exit-door control apparatus - Google Patents

Automatic exit-door control apparatus Download PDF

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Publication number
KR20080093729A
KR20080093729A KR1020070037861A KR20070037861A KR20080093729A KR 20080093729 A KR20080093729 A KR 20080093729A KR 1020070037861 A KR1020070037861 A KR 1020070037861A KR 20070037861 A KR20070037861 A KR 20070037861A KR 20080093729 A KR20080093729 A KR 20080093729A
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KR
South Korea
Prior art keywords
emergency
opening
door
emergency door
state
Prior art date
Application number
KR1020070037861A
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Korean (ko)
Inventor
채병태
Original Assignee
채병태
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 채병태 filed Critical 채병태
Priority to KR1020070037861A priority Critical patent/KR20080093729A/en
Publication of KR20080093729A publication Critical patent/KR20080093729A/en

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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/70—Power-operated mechanisms for wings with automatic actuation
    • E05F15/72—Power-operated mechanisms for wings with automatic actuation responsive to emergency conditions, e.g. fire
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/132—Doors

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Abstract

The present invention interposes the installation position of the emergency switch for manual opening in the event of an emergency with respect to the emergency door installed at the emergency exit between the control means (ie, the control unit) and the emergency door opening and closing door. An emergency door automatic opening and closing device for improving the reliability and accuracy while providing a visual indication of the actual emergency door opening by the emergency switch.

According to the preferred emergency door automatic opening and closing device, the emergency door opening and closing door of the normal operation state is operated through the emergency door driver under the control of the control unit in case of abnormality of the fire signal applied from the fire signal receiver and the emergency power by the main power source and the battery. In the configuration for opening the emergency door, the emergency switch for manual opening of the emergency door is disposed in the always-connected state of the emergency signal opening and closing signal line transmitted from the control unit to the emergency door opening and closing, and the normally connected state and operation of the emergency switch The emergency door opening and closing detection unit is further provided for detecting an open state by the control unit. The control unit includes a control to display an operation state of the emergency switch detected by the emergency door opening and closing detection unit through the operation state display unit.

Description

Emergency door automatic opening and closing device {AUTOMATIC EXIT-DOOR CONTROL APPARATUS}

1 is a view for explaining the appearance configuration of a general emergency door automatic opening and closing device,

Figure 2 is a functional block diagram of the automatic door opening and closing device shown in Figure 1,

3 is a block diagram of an automatic emergency door opening and closing device according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: emergency door automatic switchgear, 12: power line,

14: fire signal line, 18: 10-kibu,

20: alarm unit, 22: emergency switch,

30: power conversion unit, 32: power state detection unit,

34: fire signal detector, 36: battery,

38: battery status detection unit, 40: control unit,

42: emergency door driver, 44: emergency door opener,

46: Emergency door open and close detection unit.

The present invention relates to an emergency door automatic opening and closing device, and more specifically, to the emergency door installed in the emergency exit in the event of an emergency, the manual opening is performed with reliability and accuracy while making a visual indication of the actual operating state It relates to an emergency door automatic opening and closing device for making.

In general, emergency doors are installed in high-rise buildings (for example, business or commercial buildings) or in multi-use emergency exits, which can be used for rapid evacuation or emergencies from the building or business in case of an emergency such as a fire. It must be kept open at all times to allow prompt action.

However, the emergency doors are usually closed to control access to the roof of the building to prevent actual safety accidents or to prohibit unauthorized entry (eg, escape) of abnormal businesses. As a result, if an emergency occurs while the emergency door is locked, it is impossible to evacuate quickly, or the loss of life or property is frequently caused because the emergency cannot be accurately and promptly identified and appropriate action can be taken. Is caused.

Therefore, emergency exit doors of high-rise buildings and emergency exits of multi-use offices are normally kept in a locked state to limit unauthorized entry and automatically switch the emergency doors to an open state in case of an emergency (especially in the event of a fire) to evacuate quickly. There is a trend that is installed emergency door automatic control device to control.

The emergency door automatic control device is connected to a fire detector (for example, P1 fire receiver) that receives a fire detection signal from a smoke sensor or a heat sensor, and a fire alarm signal (DC 24V) applied from the fire receiver when a fire is detected. It is connected to receive the fire alarm signal from the alarm bell or emergency guiding lamp (especially three-phase emergency guiding lamp) operated by the fire alarm, and when the alarm alarm is applied from the fire receiver, the alarm door automatic control device is operated. Will release the locked emergency door manually.

1 is a view for explaining the appearance of a general emergency door automatic opening and closing device, Figure 2 is a functional block diagram of the emergency door automatic opening and closing device shown in FIG.

Referring to FIG. 1, the emergency door automatic opening and closing device 10 is provided with a power line 12 to which a main power source (AC 220V) is applied, and in case of emergency from a fire receiver (for example, a P1 fire receiver; not shown). The fire signal line 14 to which a signal applied to drive a warning bell (not shown) and an emergency exit guide light is applied as a fire signal.

The emergency door automatic opening and closing device 10 is provided with a 10-key portion 16 for managing the opening and closing function of the emergency door by a password, when the password set by the 10-key portion 16 is normally input The emergency door can be opened manually.

In addition, the emergency door automatic switching device 10 is provided with a plurality of LED elements 16a to 16f for visually displaying the operation state, and the LED elements 16a to 16f are, for example, main power state display LED elements ( 16a), the emergency power state indication LED element 16b, the emergency power charge state indication LED element 16c, the emergency door open / close state display LED element 16d, and the cover open state indication of the corresponding emergency door automatic open / close device 10; The LED element 16e and the emergency door opening / closing state indication LED element 16f are included, and the arrangement order is not necessarily fixed and can be arbitrarily arranged as well as other operating states (for example, a fire detection signal reception state). Increasing the number of LED elements for the indication of is possible as needed.

In addition, the emergency door automatic opening and closing device 10 is provided with a 10-key portion 18 for enabling the manual opening of the emergency door by a password (for example, a key-password-key). The password set by the 10-key section 18 can be changed through a predetermined procedure (e.g., a key operation of the # -password-\-change target password-\-change target password- *).

In addition, the emergency door automatic opening and closing device (10) when the emergency occurs, that is, when the fire signal is applied from the fire receiver through the fire signal line 14 or the cover of the corresponding emergency door automatic opening and closing device (10) arbitrarily In case of opening, an alarm (for example, a level of 90db to 115dB) is output to notify an emergency situation, for example, an alarm unit 20 to which a speaker or a buzzer is applied, and an emergency switch 22 for manually opening an emergency door. ) Is installed.

Referring to FIG. 2, the power line unit 12 receiving the main power source AC 220V is connected to a power conversion unit 30 that generates DC power required for the corresponding emergency door automatic switching device 10. A power state detection unit 32 that detects whether the DC power is output from the power conversion unit 30 and detects a state including a power failure of the main power is connected.

The fire signal line 14 is connected to a fire signal detection unit 34 for detecting whether a fire signal is applied from the fire signal receiver through the fire signal line 14.

The battery 36 which applies the emergency power in the power failure state of the main power is charged through a battery charging means (not shown), and whether the battery 36 is in a circuit fault state or abnormally charged is the battery state detection unit. Is detected by 38.

The main power detection result of the power state detection unit 32, the fire signal detection result of the fire signal detection unit 34 and the battery state detection result are applied to the control unit 40, and the input side of the control unit 40 is The 10-key portion 18 and the emergency switch 22 are also connected.

An operation state display unit 16 for driving the LED elements 16a to 16f is connected to an output side of the control unit 40 and an emergency door driver 42 for opening an emergency door. And emergency door opening and closing 44 and the alarm unit 20 is connected.

Here, the emergency door opening and closing door 44 is preferably assumed to be an electromagnetic lock (Electromagnetic lock), it is also possible to apply the door opening and closing structure employed in the digital door lock including an electric motor or a solenoid.

In the emergency door automatic opening and closing device 10 having the above-described configuration, first, the password inputted by the operation of the 10-key unit 18 is controlled by an internal memory area or a separate memory area (not shown). )

In this state, the main power applied to the corresponding emergency door automatic opening and closing device 10 through the power line 12 is converted into DC power through the power conversion unit 30 to the corresponding emergency door automatic opening and closing device 10 In addition to being applied as an operating power source of), it is also applied to the charging of the battery 36.

When the DC power is normally applied from the power conversion unit 30 through the power state detection unit 32, the control unit 40 may display the main power state display LED device 16a through the operation state display unit 16. While the normal state of the main power supply is turned on visually, when the DC power is not output from the power conversion unit 30 or is output at an abnormal level, the main power state through the operation state display unit 16. The display LED device 16a is turned off or blinks to visually check an abnormal state of the main power supply.

In addition, when the battery 36 is normally connected through the battery state detecting unit 38 and a normal charging power level is detected and applied, the control unit 40 provides emergency power through the operating state display unit 16. In addition to turning on the status display LED element 16b, the charging state of the battery 36 controls the lighting state of the emergency power charging state display LED element 16c, while the battery 36 controls the circuit. In the case of a short-circuit state or normal charging does not proceed, it is detected as a battery failure and the emergency power state display LED element 16b and the emergency power state display LED element 16c through the operation state display unit 16. Will turn off or flash.

In the state where the main power received through the power line 12 and the battery 36 are in a normal state, the control unit 40 locks the emergency door through the emergency door driving unit 42 through the emergency door driving unit 42. To be maintained.

In that state, when a fire signal (that is, a signal applied to a fire alarm or emergency exit induction from the fire signal receiver) is applied from the fire signal receiver to the fire signal line 14 through the fire signal line 14, the fire signal is set to the fire signal. The control unit 40 is provided to the control unit 40 through a signal detecting unit 34, and accordingly, the control unit 40 operates the emergency door opening / closing door 44 through the emergency door driving unit 42 to lock the emergency door. Will be released so that emergency doors can be opened and evacuated quickly in the event of an emergency.

In addition, the control unit 40 causes the emergency door opening / closing state display LED element 16f to be turned on or flashing through the operation state display unit 16, and outputs an alarm sound through the alarm unit 20. do.

Preferably, the control unit 40 is operated by the emergency power (preferably the power supply duration is 20min or more) provided from the battery 36 within a predetermined time (for example, 5sec) when the main power is determined to be abnormal. If the abnormal state of the main power has elapsed for a predetermined time (for example, 20 minutes), the emergency door opening and closing door 44 is operated through the emergency door driver 42 to lock the emergency door. While being released, it is controlled to switch the current display state of the main power state display LED element 16a and the emergency door opening / closing state display LED element 16f via the operation state display unit 16 to be displayed.

By the way, the emergency switch 22 is connected to the input side of the control unit 40, and when the operation state of the emergency switch 22 is detected by the control unit 40, the emergency phrase under the control of the control unit 40 The emergency door opening and closing 44 is driven through the eastern 42 to open the emergency door, but in such a configuration, the controller 40 malfunctions due to external factors such as high voltage or shock noise. If the control unit 40 does not normally respond to the operation of the emergency switch 22, the emergency door may not be opened even in an emergency situation.

In addition, the display of the state in which the emergency door is opened by the operation of the emergency switch 22 also the control unit 40 controls the operation display unit 16 in response to the operation of the emergency switch 22 to the emergency Since the door opening / closing state display LED element 16f is turned on or flashes, the possibility of the actual state of opening of the emergency door is not increased.

The present invention has been made to solve the above problems of the prior art, the emergency switch for manually switching the emergency door opening and closing door installed in the emergency door control means (for example, central processing unit (CPU) or microcomputer) It keeps connected at the end of always, but during its operation, it cuts off the signal (power) path for emergency door opener and irrelevant to control of control means and applies the signal cutoff state for the emergency door opener to the control means. It is an object of the present invention to provide an automatic emergency door opening and closing device for displaying the opening state of the emergency door.

In order to achieve the above object, according to a preferred embodiment of the present invention is connected to a fire signal line and a fire signal detection unit for receiving a fire signal output from the fire signal receiver, and a power conversion unit of the main power (AC 220V) main power Power state detection unit for detecting the state of the emergency state, Emergency power state detection unit for detecting the state of emergency power by the battery, Emergency door opening and closing door for opening and closing the emergency door and emergency door driving unit for driving the emergency door opening and closing, the emergency door An emergency door automatic opening and closing device having an alarm unit for alarming an open state, a 10-key unit for manual opening of the emergency door, an emergency switch for manual opening of the emergency door, and a control unit for overall control, The switch is arranged in a state of constant connection to the open / close signal line of the emergency door transmitted from the control unit to the emergency door opening and closing, the emergency switch The emergency door opening and closing detection unit is further provided for detecting the normally connected state and the open state of the operation, the control unit to display the operation state of the emergency switch detected by the emergency door opening and closing detection unit through the operation state display unit An emergency door automatic switchgear including control is provided.

The emergency switch is interposed between the emergency door driver and the emergency door opening and closing device or between the controller and the emergency door driver.

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

3 is a block diagram of the automatic door opening and closing device according to a preferred embodiment of the present invention, the same parts as those shown in Figure 2 will be described with the same reference numerals.

That is, the main power (AC 220V) applied to the power line (22 in FIG. 1) is converted to DC power in the power conversion unit 30 is applied to the operation of the corresponding emergency door automatic opening and closing device 10, The power state detection unit 32 detects the DC power level of the power conversion unit 30 and applies the state of the main power supply to the control unit 40.

The fire signal output from the fire signal receiver when an emergency occurs is applied to the control unit 40 through the fire signal detection unit 34.

In addition, the battery 36 that applies the emergency power in the power failure state of the main power supply is provided to the controller 40 by detecting whether the circuit is defective or whether the battery is abnormally charged by the battery state detection unit 38.

The 10-key section 18 is also connected to the input side of the control section 40, and the password set in the 10-key section 18 is stored in a memory area or a separate memory area (shown in the control section 40). Is omitted).

An operation state display unit 16 for driving the LED elements 16a to 16f is connected to an output side of the control unit 40 and an emergency door driver 42 for opening an emergency door. And emergency door opening and closing 44 and the alarm unit 20 is connected.

Here, the emergency door opening and closing door 44 is preferably assumed to be an electromagnetic lock (Electromagnetic lock), it is also possible to apply the door opening and closing structure employed in the digital door lock including an electric motor or a solenoid.

Preferably, according to the present invention, the emergency switch 22 for manually opening the emergency door is interposed between the emergency door driver 42 and the emergency door opening and closing door 44 and is installed to maintain a constant connection state. .

The control unit 40 detects an operation state (ie, an open state) of the emergency switch 22 between the emergency switch 22 and the emergency door opening / closing 44 and the control unit 40. An emergency door opening / closing detection unit 46 for applying to the door is interposed, and a capacitor indicated by 46a is installed for level smoothing to absorb and remove an impulsive signal applied to the emergency door opening / closing detection unit 46.

In the emergency door automatic opening and closing device 10 having the above-described configuration, first, the password inputted by the operation of the 10-key unit 18 is controlled by an internal memory area or a separate memory area (not shown). )

In this state, the main power applied to the corresponding emergency door automatic opening and closing device 10 through the power line 12 is converted into DC power through the power conversion unit 30 to the corresponding emergency door automatic opening and closing device 10 In addition to being applied as an operating power source of), it is also applied to the charging of the battery 36.

When the DC power is normally applied from the power conversion unit 30 through the power state detection unit 32, the controller 40 controls the main power state display LED device 16a through the operation state display unit 16. When the normal state of the main power is turned on to be visually displayed, the main power state is displayed through the operation state display unit 16 when the DC power is not output from the power conversion unit 30 or is output at an abnormal level. By turning off or blinking the LED element 16a to visually check the abnormal state of the main power supply.

In addition, when the battery 36 is normally connected through the battery state detecting unit 38 and a normal charging power level is detected and applied, the control unit 40 provides emergency power through the operating state display unit 16. In addition to turning on the status display LED element 16b, the charging state of the battery 36 controls the lighting state of the emergency power charging state display LED element 16c, while the battery 36 controls the circuit. In case of abnormally shorted state or normal charging does not proceed, the battery is detected as defective and the emergency power state display LED element 16b and the emergency power state display LED element 16c are detected through the operation state display unit 16. ) Will turn off or flash.

When the main power received through the power line 12 and the battery 36 are in a normal state, the controller 40 controls the emergency door through the emergency door driver 42 and the emergency switch 22 in the always-connected state. The emergency exit door 44 is to be kept in a locked state.

In that case, the emergency door open / close detection unit 46 detects a stable signal level by the smoothing capacitor 46a and detects a constant signal level (eg, a DC power supply of 12 V or 24 V). Normal power is applied to detect the state in which the emergency door is locked and apply to the control unit 40, accordingly, the control unit 40 through the operation state display unit 16, the emergency door opening and closing display LED device ( 16f) will remain off.

In that state, when a fire signal (that is, a signal applied to a fire alarm or emergency exit induction from the fire signal receiver) is applied from the fire signal receiver to the fire signal line 14 through the fire signal line 14, the fire signal is set to the fire signal. The control unit 40 is provided to the control unit 40 through a signal detecting unit 34, and accordingly, the control unit 40 is configured to open the emergency door through the emergency door driver 42 and the emergency switch 22 in the normally connected state. The signal is applied to the emergency door opening and closing door 44 to release the lock of the emergency door, so that the emergency door can be opened and evacuated quickly when an emergency occurs.

In addition, the control unit 40 causes the emergency door opening / closing state display LED element 16f to be turned on or flashing through the operation state display unit 16, and outputs an alarm sound through the alarm unit 20. do.

Preferably, the control unit 40 is operated by the emergency power (preferably the power supply duration is 20min or more) provided from the battery 36 within a predetermined time (for example, 5sec) when the main power is determined to be abnormal. If the abnormal state of the main power has elapsed for a predetermined time (for example, 20 minutes), the emergency door opening and closing door 44 is operated through the emergency door driver 42 to lock the emergency door. While being released, it is controlled to switch the current display state of the main power state display LED element 16a and the emergency door opening / closing state display LED element 16f via the operation state display unit 16 to be displayed.

In addition, when the emergency switch 22 is operated to manually open the emergency door and is switched from the normally connected state to the open state, the control unit 40 passes through the emergency door driver 42. Since the signal line applied to the emergency door opening and closing gate 44 is cut off, and thus the closed state maintaining signal applied to the emergency door opening and closing gate 44 is removed, the closed state of the emergency door is released to enable manual opening of the emergency door. Done.

In this case, the emergency door opening and closing detection unit 46 does not detect the signal level by opening the emergency switch 22, and the state is applied to the control unit 40 so that the control unit 40 detects the detection result. The emergency state opening / closing state display LED element 16f is flickered or turned on by the operation state display unit 16, so that the actual state display can be made.

Meanwhile, the present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the technical gist and gist of the invention.

That is, the emergency switch 22 may be formed of a relay or a semiconductor element (for example, a switching transistor) as a switching element.

In addition, the emergency switch 22 may be included in a circuit designed inside the emergency door opening and closing 44 or may be interposed between the control unit 40 and the emergency door driving unit 42.

As described above, according to the emergency door automatic opening and closing device according to the present invention, the emergency switch for manually opening the emergency door opening and closing door for opening and closing the emergency door installed in the emergency exit is installed at the rear of the control means (that is, the control unit). By opening the signal line applied to the emergency door opening and closing door in the control means (control unit) during its operation, the emergency door can be opened even in an error state of the control means.

In addition, the emergency opening state of the emergency door by the operation of the emergency switch is detected by the emergency door opening and closing detection unit is applied to the control means, the actual emergency door opening state can be visually displayed through the operating state display.

Claims (2)

Fire signal line and fire signal detection unit for receiving the fire signal output from the fire signal receiver, the power state detection unit connected to the power conversion unit of the main power supply (AC 220V) to detect the state of the main power, emergency power by the battery Emergency power state detection unit for detecting a state, emergency door opening and closing door for opening and closing the emergency door and emergency door driving unit for driving the emergency door opening and closing door, an alarm unit for alarming the opening state of the emergency door, for manual opening of the emergency door In the emergency door automatic opening and closing device having a 10-key portion, an emergency switch for manual opening of the emergency door, and a control unit for overall control, The emergency switch is disposed in the connection state of the emergency door open and close signal line transmitted from the control unit to the emergency door opening and closing door, Emergency door opening and closing detection unit for detecting the always-connected state and the open state of the emergency switch is further provided, And the control unit includes a control for displaying the operation state of the emergency switch detected by the emergency door open / close detection unit through the operation state display unit. The emergency door automatic opening and closing device according to claim 1, wherein the emergency switch is interposed between the emergency door driving unit and the emergency door opening and closing door, and between the control unit and the emergency door driving unit.
KR1020070037861A 2007-04-18 2007-04-18 Automatic exit-door control apparatus KR20080093729A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200458979Y1 (en) * 2009-08-07 2012-03-21 (주) 금강씨에스 Fire door closer with fire watching function
WO2013157762A1 (en) * 2012-04-17 2013-10-24 Yoon Byungman Digital entrance opening and closing device
KR101363098B1 (en) * 2012-04-17 2014-02-13 윤병만 Digital Opening And Closing Device for Exit
KR101428448B1 (en) * 2012-03-09 2014-08-07 (주)발해기술단 Emergency power controller of electronic locking mechanism and control method thereof
KR20160120528A (en) 2015-04-08 2016-10-18 구남호 Door for rooftop of openning and closing device
KR102174596B1 (en) * 2019-07-09 2020-11-05 주식회사 에스원 Method and apparatus for controlling electromagnetic lock
KR20220015213A (en) 2020-07-30 2022-02-08 김재현 Apparatus for opening and closing emergency exit door

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200458979Y1 (en) * 2009-08-07 2012-03-21 (주) 금강씨에스 Fire door closer with fire watching function
KR101428448B1 (en) * 2012-03-09 2014-08-07 (주)발해기술단 Emergency power controller of electronic locking mechanism and control method thereof
WO2013157762A1 (en) * 2012-04-17 2013-10-24 Yoon Byungman Digital entrance opening and closing device
KR101363098B1 (en) * 2012-04-17 2014-02-13 윤병만 Digital Opening And Closing Device for Exit
CN104246097A (en) * 2012-04-17 2014-12-24 尹炳万 Digital entrance opening and closing device
CN104246097B (en) * 2012-04-17 2016-11-02 尹炳万 Digital gateway opening and closing device
US9528299B2 (en) 2012-04-17 2016-12-27 Byungman YOON Digital entrance opening and closing device
KR20160120528A (en) 2015-04-08 2016-10-18 구남호 Door for rooftop of openning and closing device
KR102174596B1 (en) * 2019-07-09 2020-11-05 주식회사 에스원 Method and apparatus for controlling electromagnetic lock
KR20220015213A (en) 2020-07-30 2022-02-08 김재현 Apparatus for opening and closing emergency exit door

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