KR200212695Y1 - An electroic door lock - Google Patents

Abstract

The present invention allows access only by a person who enters a password or has a contactless card to open the door, and automatically recognizes the door's open or closed state even when the door is closed. By using the fixing bracket, the non-expert can easily install the door lock by using the fixing bracket, so that it is not only convenient to operate and use, but also easy to install, and also enhances the security by reinforcing the security function, In addition, the electronic door lock for opening and closing the lever handle in both directions, which is provided with a unlocking means for opening the door, the outer handle portion formed with the lever handle, the lever handle is formed so as to face the outer operation portion and , An inner operation part provided with a battery part, the outer operation part and an inner tank A dead bolt housed in a lock case located between the parts, which is sunk by an electronic signal to lock or unlock the door, driving means for operating the dead bolt, and accommodated in the lock case, The ratchet bolt is sunk by the operation of the lever handle, and the ratchet bolt is interlocking means for projecting.

Description

Electronic door lock {AN ELECTROIC DOOR LOCK}

The present invention relates to an electronic door lock, and more particularly, to enter only a person with a password or a non-contact card to the key button formed on the outside in order to open the door, the door open or closed state of the door lock This self-recognized door automatically locks even when the door is closed, and by using a fixed bracket, non-experts can easily install the door lock, making it easy to operate and use as well as simplify installation. The present invention relates to an electronic door lock that reinforces to improve security and also enables lever levers to be opened and closed in both directions.

In general, the electronic door lock is intended for convenience of use by locking or unlocking the door by a card or key button operation without using a key to improve security and security.

However, the electronic door locks as described above have a problem in that the door is locked only after the key is closed by the automatic closing device even after the door is opened.

In other words, if the person does not accidentally lock the door, the door is in a state that can be opened from the outside.

In addition, conventional door locks are manufactured in case of forgotten passwords or lost cards, and emergency keys are produced. Key holes are formed in the outer operation part, so key experts can easily open the door, which makes security easy. There was no problem.

In addition, the conventional door lock has a problem that it is not easy to install the internal and external control panel and the lock case.

In other words, the fixing rod is provided to fix the internal and external operation parts to the door, and each of the fixing rods is inserted into the fastening hole formed on the door to be coupled to each other.

In addition, the conventional door lock has a structural problem in which the direction of the handle must be changed as well as the direction of the handle depending on whether the door to install the door lock device is opened to the left or to the right when the door lock device is to be installed in the door only in one direction. Therefore, the door lock for the door opening to the left and the door lock for the door opening to the right are sold separately.In this case, the user or contractor should always select the door lock device by knowing the opening form of the door. When the device is prepared, it must be exchanged again, and once purchased and used again, the other doors have many inconveniences, such as being impossible to use due to incorrect orientation.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide an electronic door lock that automatically locks the door even when the door is closed by recognizing the open or closed state of the door.

Another object of the present invention is to provide an electronic door lock that allows a non-expert to easily install a door lock using a fixing bracket.

Another object of the present invention is to provide an electronic door lock to enhance the security by reinforcing the security function.

Still another object of the present invention is to provide an electronic door lock that enables the lever handle to be opened and closed in both directions.

1 is a cross-sectional view showing the overall configuration of the present invention.

Figure 2 is an exploded perspective view showing an exploded component of the lock case of the present invention.

Figure 3 is a cross-sectional view of the lock case of the present invention.

Figure 4 is a cross-sectional view of the dead bolt and ratchet bolt in the lock case backward in Figure 3;

5 is a cross-sectional view showing a state in which the driving gear and the dead bolt in Figure 3 coupled.

6 is a cross-sectional view showing a state in which the dead bolt is reversed in FIG.

Figure 7 is an exploded perspective view showing that the electronic door lock of the present invention is installed on the door.

8 is a cross-sectional view of the combined state of FIG.

9 is a sectional view showing the main portion of the anti-theft device of the present invention.

FIG. 10 is a plan view of FIG. 9, illustrating a state in which the manual latch is inserted into the door.

11 is a view showing a state in which the door is unlocked in FIG.

12 is an enlarged cross-sectional view of the inner operation portion of the present invention.

FIG. 13 is a view to manually unlock the door in FIG. 12; FIG.

FIG. 14 is a perspective view illustrating main parts of repositioning the lever handle in both directions in FIG. 12; FIG.

15 is a view showing a state in which the lever handle of the present invention is located on the left side.

FIG. 16 is a view illustrating a state in which the lever handle is changed to the right in FIG. 15.

17 is a view showing another embodiment of the unlocking means of the present invention.

(Explanation of symbols for the main parts of the drawing)

100: door lock 10: outer operation part

11: outer body 12: lever handle

12a: cardantenna 13: contactless card

14: Cap 15: Sensor

20: inner operation part 21: inner body

21a: battery 22: lever handle

23: lever pin 24: coupling pin

25: rotary pin 26: push cap

27: handle connector 27a: protrusion

28: change lever plate 28a: large diameter part

28b: small diameter 28c: coupling groove

29; Stop plate 30: lock case

31: main body 31a: arc supporter

31b: Deadbolt Inspector 31c: Ratchetbolt Inspector

32: dead bolt 32a: vertical guideman

32b: level guide 32c: rack

32d: Shading 33: Ratchet Bolt

34: lever shaft 35: manual release shaft

40: drive means 41: drive motor

42: drive gear 50: interlocking means

51: first rotating body 51a: working projection

52: second body 52a: locking piece

52b: engaging groove 53: operating piece

53a: through hole 53b: protrusion

54: torsion spring 55: fixed shaft

56: connecting body 56a: first ratchet bolt arm

56b: second ratchet bolt arm 56c: spring stopper

56d: spring 60: forward and reverse sensors

70: locking sensor 80: body plate

90: fixing bracket 91: protrusion

200: door 210: coupling groove

220: joint pin

The present invention for solving this object is provided with an unlocking means for opening the door, the outer operating portion formed with the lever handle, the lever handle is formed so as to face the outer operating portion, the inner operating portion provided with a battery, A dead bolt housed in the lock case located between the outer manipulator and the inner manipulator, and driven by an electronic signal to lock or unlock the door, drive means for operating the dead bolt, and housed in the lock case; In addition, the ratchet bolt is mounted by the operation of the inner and outer lever handle, and the ratchet bolt is interlocked means for projecting.

In addition, when the door is closed by the automatic closing device after the door is opened is provided with a lock sensor installed in the lock case to automatically detect and operate the drive means to lock the dead bolt in the door frame.

In addition, the locking sensor is composed of an optical sensor consisting of a light emitting unit and a light receiving unit.

In addition, the unlocking means is a card antenna is provided in the outer operation portion to recognize the card and the card and the code of the accessor possesses.

In addition, the unlocking means is provided with a plurality of key buttons electronic door lock, characterized in that made to enter a password.

In addition, the driving means is composed of a drive motor for forward and reverse rotation, a drive gear coupled to the shaft of the drive motor, and a rack integrally formed on one side of the dead bolt and engaged with the drive gear.

In addition, the forward and reverse rotation of the drive motor is provided with a light shielding piece protruding from the dead bolt interlocked with the drive motor, and forward and backward installed in the lock case to sense the position by the light shielding piece to stop the driving motor. It is made of sensors.

In addition, the forward and backward sensors are composed of an optical sensor provided on the left and right sides of the light emitting unit and the light receiving unit.

In addition, the linkage means is a lever pin for connecting the inner and outer lever handles, the first projection body is formed to rotate by the rotation of the lever pin is coupled to the lever shaft and freely rotated, the first The engaging piece is coupled to the operation protrusion of the first rotating body, the second rotating body having a coupling groove formed at the lower side, and one side is hinged to the lock case, and the center is coupled to the coupling groove of the second rotating body to center the hinge shaft. One side is connected to the ratchet bolt formed in the door frame is connected to the end of the operation piece and the operation piece to move in an arc and the spring is fixed.

In the following Figure 1 of the accompanying drawings shows the overall configuration of the subject innovation in detail, in the figure 100 denotes a door lock according to the subject innovation, and 200 denotes a door.

The door lock 100 is largely comprised of an outer operation part 10, an inner operation part 20, and a lock case 30 located between them and accommodating an operation part.

The outer operation part 10 is installed outside the door, and consists of an outer body 11 and a lever handle 12 provided at the center of the outer body.

The lever handle 12 is provided with a card antenna 12a connected to a microcomputer (not shown), which is configured to unlock a door by wirelessly checking a frequency and a code with a non-contact card 13 carried by an accessor. It is done.

The contactless card 13 is a so-called R.F (radio frequency) card, in which a specific code is stored in the center, and a coil for generating a magnetic force is wound around the card.

In addition, a coil for generating magnetic force is wound around the card antenna 12a to transmit and receive radio waves wirelessly with the non-contact card 13.

The inner operation part 20 is installed inside the door, and is connected to the inner body 21 and the battery part 21a and the outer lever handle 12 installed at the lower end of the inner body 21 to supply power. The inner lever handle 22 is made up.

The lock case 30 is inserted and fixed inside one side of the door, as shown in FIGS. 2 to 4, which is an enclosure shape main body 31 separated into left and right sides, and inside the main body 31. A ratchet bolt 33 interlocked with the dead bolt 32 and the inner and outer lever handles 22 and 12 accommodated by the operation signal and a driving means 40 for driving the dead bolt 32; It consists of an interlocking means (50) for operating the ratchet bolt (33).

The main body is formed with an arc hole 31a, a dead bolt guide hole 31b and a ratchet bolt guide hole 31c.

A lever pin 23 is inserted into the arc hole 31a to connect the inner and outer handle levers 22 and 12 so that when one side of the inner and outer handle levers 22 and 12 is operated, the ratchet bolt is interlocked. 33) to lock or unlock the engaging groove in the door frame.

The dead bolt 32 is coupled to the dead bolt guide hole 31b by a shaft, and the operating piece 53 is fixed to the fixed shaft 55 by the ratchet bolt guide hole 31c.

The dead bolt 32 is installed in the upper portion of the main body 31 to move forward and backward, one side is inserted into the locking groove in the door frame, the other side is formed with a vertical guide hole 32a, the middle of the horizontal guide The long hole 32b is formed.

In addition, a rack 32c is formed between the vertical guide hole 32a and the horizontal guide hole 32b.

Further, the light shielding piece 33d protrudes from the lower side of the dead bolt 32 to block the signal of the forward / reverse sensor 60 which will be described later, so that the dead bolt 32 is moved forward and backward.

The forward and backward sensors 60 are formed in pairs on both sides, and the light emitting part 61 and the light receiving part 62 are provided on one side as optical sensors.

That is, when the light-emitting portion 61 and the light-receiving portion 62 are blocked by the light shielding piece 33d formed on the dead bolt 32, the power is cut off to stop the operation of the driving motor 41 to be described later.

The ratchet bolt 33 is inclined at one side and is locked or unlocked to the locking groove in the door frame by the operation of the inner and outer lever handles 22 and 12.

The drive means 40 is engaged with the drive motor 42, the drive gear 42 coupled to the shaft of the drive motor 41, the drive gear 42, and integrally formed with the dead bolt 32. It consists of the rack 32c.

The drive motor 41 is fixed to the upper side of the lock case 30, and the power is applied by the signal of the microcomputer to rotate forward and reverse.

The drive gear 42 is coupled to the shaft of the drive motor 41 to transfer the driving force to the rack 32c, and transfers the dead bolt 32 having the rack 32c formed inside the lock case 30. ㆍ Reverse to lock or unlock the door. (Refer to FIG. 5 and FIG. 6)

In addition, a lever shaft 34 coupled to one side of the vertical guide hole 32a of the dead bolt 32 is positioned coaxially with the lever handles 22 and 12.

The interlocking means 50 is supported on the lever shaft 34 so as to be freely rotatable and interlocked with the inner and outer lever handles 22 and 12 and the first rotating body 51. The connecting body 54 which protrudes the ratchet bolt 33 by the operation | movement of the 2nd rotation body 52 which interlock | operates, the operation piece 53 which is interlocked with the said 2nd interlocking body 52, and the said operation piece 53 It is composed of

The first rotating body 51 is coupled to the coaxial of the lever shaft 34, and the operating projection 51a is provided on both sides.

The second rotating body 52 is composed of a locking piece 52a that is caught by the operating protrusion 51a of the first rotating body 51 and a coupling groove 52b fixed to the operating piece 53 at the center lower end thereof. .

The operating piece 53 is located at the lower side of the lock case 30, one side is hinged to the lock case 30, and at the same time is provided with a torsion spring 54, the through hole (53a) in the center is made of It is coupled to the coupling groove 52b of the two pivoting bodies 52 by a fixed shaft 55.

In addition, the other side of the operation piece 53 is formed with a protrusion 53b protruding upward.

The ratchet bolt 33 is interlocked by the operation of the operating piece 53 to lock or unlock the locking groove in the door frame, and a spring 56d is fitted therein.

The connecting body 56 connects the operation piece 53 and the ratchet bolt 33, and is composed of a first ratchet bolt arm 56a, a second ratchet bolt arm 56b, and a spring stopper 56c. .

The first ratchet bolt arm 56a has a U-shape, and a groove is formed in which one side is coupled to the ratchet bolt 33 and the upper and lower sides are coupled to the second ratchet bolt arm 56b.

The second ratchet bolt arm 56b has a coupling protrusion 56b 'coupled to one of the grooves 56a' of the first ratchet bolt arm 56a, and the other end of the ratchet bolt guide hole 31c of the case. It is coupled to the shaft and at the same time is coupled to the protrusion (53b) of the working piece (53).

That is, the shaft 56e is fitted between the ratchet bolt guide hole 31c of the lock case main body 31 and the through hole of the second ratchet bolt arm 56b, and the shaft 56e is rotated by the operating piece 53. It is interlocked by the protrusion 53b.

The spring stopper 56c is fixed to the case by the projection 56c 'and the spring 56d is sandwiched between the ratchet bolts 33 to provide a return force for moving the ratchet bolts 33 forward and backward.

In addition, a locking sensor 70 which is sensed when the door is automatically closed and moves forward and backward of the dead bolt 32 is installed inside one side of the lock case body 31.

The locking sensor 70 is a reflection type optical sensor in which a light emitting unit 71 and a light receiving unit 72 are formed, and a reflecting plate (not shown) is provided inside the lock groove in the door frame to emit light from the light emitting unit 71. When the infrared light is reflected and reaches the light receiving unit 72, the signal is detected to drive the driving motor 41 to operate the dead bolt 32 to lock the door.

On the other hand, Figure 7 and Figure 8 is a view for showing the installation of the inner and outer operation portion 20, 10 of the present invention in the door.

It is fixed to the door consisting of a body plate 80 fixed to the outer operation portion 10, a joint pin 220 inserted into the upper and lower sides of the door and a fixing bracket 90 for fixing the inner operation portion 20.

That is, the outer body 11 is fixed to the body plate 80, the body plate 80 is screwed to the joint pin 220 provided through the door.

The fixing bracket 90 is formed of a square plate, and a hole is drilled to be fixed to the joint pin 220, and both sides of the fixing bracket 90 are formed with a protrusion 91 to which the inner operation part 20 is fixed.

That is, the outer operation part 10, the body plate 80 and the joint pin 220 is manufactured and sold integrally, and when the door is installed in the door, the joint pin 220 is inserted and fixed by drilling a hole penetrating the door. The bracket 90 is assembled with screws from the inside.

In addition, the inner operating part 20 is inserted into the protruding piece 91 of the side of the fixing bracket 90, and screwed from the outside can be easily installed.

9 to 11 show that the door can be opened from the outside when the contactless card is lost.

The cap 14 of the synthetic resin material is fixed to the center of the lever handle 12 of the outer operation portion 10, the manual release shaft 35 is fixed to the lever shaft 34 of the lock case 30 inside the door. It is configured to unlock the dead bolt 32 manually.

That is, the outer operation part 10 is not formed with an emergency key hole for releasing the locking device, and punched or removed a hole in the cap 14 made of a synthetic resin material by using a separate release hatch (S). When the release port S is inserted into the lever handle 12 and the manual release shaft 35 is artificially rotated, the dead bolt interlocked with the lever shaft 34 by rotating the lever shaft 34 interlocked therewith ( It will be able to release the door by reversing the 32 into the lock case (30).

In addition, a detection sensor 15 that detects when an external intruder damages the cap 14 to unlock the door and sounds an alarm sound is installed inside the lever handle 12, and a preset phone book is also provided. The microcomputer is set to notify.

In addition, in the case as described above as well as to open the door from the inside can be operated manually, as shown in the accompanying drawings, Figure 12 and 13 flows inward in the center of the lever handle 22 of the inner operation part (20) Combination pin 24 is fitted with the coupling pin 24 is composed of a rotating pin 25 to rotate the manual release shaft 35 is pressed cam 26 to open the door in case of emergency such as fire It consists of opening the door manually by pressing.

12 and 14 show a configuration in which the lever handle can be used in both directions.

Since this is applied to the inner and outer operation parts 20 and 10, respectively, the inner operation part 20 will be described as an example.

The handle connector 27 is installed inside the lever handle 22, and is composed of a change lever plate 28 coupled to the handle connector 27, and a stop plate 29 on which the change lever plate 28 is engaged. have.

The handle connector 27 is connected to the lever handle 22 of the inner operation part 20, one side of which is fixed to the lever handle 22, and the other side of the protrusion piece 27a having a coupling hole is formed.

The change lever plate 28 has a circular shape, and is divided into a large diameter portion 28a and a small diameter portion 28b on the basis of the center, and a coupling groove in which the protrusion piece 27a of the handle connector 27 is seated on the front surface. 28c is formed.

The stop plate 29 is in surface contact with the side surface of the large diameter portion 28a of the change lever plate 28 to set the lever handle 22 in the left or right direction as shown in FIGS. 15 and 16. .

On the other hand, as another embodiment of the present invention, Figure 17 shows that the unlocking means of the outer operation portion is composed of a button.

It is equipped with a keypad (11a) having a plurality of buttons on the upper side of the outer body 11, if a multi-digit password is input through this, the built-in microcomputer determines the input password and outputs a control signal to lock the door lock You can unlock the state.

Referring to the operation of the present invention configured as described in detail as follows.

After the inner and outer operation units 20 and 10 and the lock case 30 are installed in the door, the card 13 to be used is registered, but the number of registrations of the card 13 is from 1 to 20 at least.

To register the card 13, press the selector switch (not shown in the drawing) installed inside the battery cover of the inner operation part 20, and move one card 13 to the center of the lever handle 12 of the outer operation part 10. Each time a single buzzer sounds and registration is made, and when the last card 13 registration buzzer sounds, pressing the selection switch again ends the card 13 registration.

Even when the registered card 13 is canceled, when the new card 13 is registered by pressing the selection switch installed inside the battery cover, the card 13 previously input is terminated.

When the process of opening the door from the outside holding the card 13 registered as described above is as follows.

When the person who owns the non-contact card 13 operates the open button with a radius of 30 ° from the center of the lever handle 12 of the outer operation part 10 and a close distance 30 cm, the door opens with a buzzer sound. The frequency is generated from the card antenna (12a) at the same time pressing the open button (not shown in the drawing), the frequency is generated by transmitting and receiving to the contactless card 13 to compare with the code set in advance in the microcomputer code If is matched, the power is applied to the drive motor 41 to open the door.

At the same time as the power is applied, the drive motor 41 is driven and the dead bolt 32 is inserted into the door frame while the drive gear 42 is axially engaged with the rack 32c on the dead bolt 32. In the lock case 30 is reversed.

In addition, while the dead bolt 32 is reversed, the lever shaft 34 inserted in the vertical guide hole 32a is rotated.

In this case, when the person rotates the lever handle 12 of the outer operation part 10, the ratchet bolt 33 is reversed into the lock case 30.

The inner and outer lever handles 22 and 12 are connected by lever pins 23, and the lever pins 23 rotate the first pivot 51, and both sides of the first pivot 51 At the same time as pulling the second rotating body 52 by the operating protrusion 51a, the operating piece 53 connected to the second rotating body 52 is upwardly centered on the hinge axis of one side.

When the connector 56 is pulled back by the operating piece 53 upward, the ratchet bolt 33 is moved backward into the lock case 30, and the door is unlocked to be in a state capable of opening the door. .

When the door is gradually closed by the automatic closing device after the person enters the open door, the torsion spring 54 and the ratchet coupled to the hinge shaft of the operating piece are handled by the lever handles 22 and 12. The original return, that is, the door is locked by the spring 56d for moving the bolt 33 forward and backward, and the dead bolt 32 is locked by the lock sensor 70 inside the lock case 30.

That is, the light emitting unit of the locking sensor 70 emits infrared light from the light emitting unit 71 to the reflecting plate in the door frame, and the emitted infrared light is reflected from the reflecting plate to be sensitive to the light receiving unit 72 to apply power to the driving motor ( 41) to rotate, the dead bolt 32 and the ratchet bolt 33 is linked to lock the insertion groove in the door frame.

On the other hand, in order to come out from the inside of the door to press the open button of the inner operation part 20 is to open the door through the above process.

In addition, the door can be opened when there is a visitor using the indoor remote control.

In addition, the door is automatically locked in the case of the automatic function after the door is opened from the inside and the outside, but in the manual function, the door can be locked by pressing the close button once.

On the other hand, when the card 13 is lost, the door is opened using a separate hatch (S), which is applied even when an unauthorized person wants to open the door and reinforces the security function.

That is, in order to insert the unlocking tool S into the lever handle 12 of the outer operation part 10, a hole must be punctured or broken in the cap 14, but the sensor 15 detects and sends an alarm sound in advance. The phone number is set to inform the door of the problem.

On the other hand, if you want to change the position of the lever handle 22 of the door, when the change lever plate 28 is pushed inward, the contact with the stop plate 29 is released, the lever handle 22 is free to rotate and change After changing the position to the combination of the change lever plate 28 and the stop plate 29 will be able to change the position.

The electronic door lock of the present invention as described in detail above, the door lock by itself recognizes the open or closed state of the door automatically locks the door even in the closed state is excellent and convenient operation.

In addition, the electronic door lock of the present invention is a non-expert who can easily install the door lock using a fixing bracket.

In addition, the electronic door lock of the present invention is to improve the security by reinforcing the security function.

In addition, the electronic door lock of the present invention is possible to change the position to open and close the lever handle in both directions, it can be applied to any of the left and right doors.

Claims (9)

An outer operation unit 10 having a unlocking means for opening the door and having a lever handle 12 formed therein; An inner operation part 20 having a lever handle 22 formed to face the outer operation part 10 and having a battery part 21a; A dead bolt 32 accommodated in the lock case 30 positioned between the outer operation unit 10 and the inner operation unit 20 and protruded by an electronic signal to lock or unlock the door; Drive means (40) for operating the dead bolt (32); A ratchet bolt 33 accommodated in the lock case 30 and sunk by the operation of the inner and outer lever handles 22 and 12; Electronic door lock, characterized in that consisting of the interlocking means (50) for placing the ratchet bolt (33). The method of claim 1, After the door is opened, the door is closed by the automatic closing device is automatically sensed by operating the drive means 40 is provided with a lock sensor 70 installed in the lock case to lock the dead bolt 32 in the door frame Electronic door lock characterized in that. The method of claim 2, The lock sensor 70 is an electronic door lock, characterized in that consisting of an optical sensor consisting of a light emitting unit 71 and a light receiving unit 72. The method of claim 1, The unlocking means includes a card (13) possessed by the accessor; Electronic door lock, characterized in that the card antenna (12a) is provided in the outer operation unit 10 to recognize the frequency and code of the card (13). The method of claim 1, The unlocking means is provided with a plurality of key buttons electronic door lock, characterized in that made to enter a password. The method of claim 1, The drive means 40 includes a drive motor 41 for forward and reverse rotation; A drive gear 42 coupled to the shaft of the drive motor 41; Electronic door lock, characterized in that consisting of a rack (32c) is integrally formed on one side of the dead bolt (32) and meshed with the drive gear (42). The method of claim 6, Forward / reverse rotation of the drive motor 41 is driven by sensing the position of the light shielding piece 33d protruding from the dead bolt 32 interlocked with the drive motor 41 and the light shielding piece 33d. An electronic door lock, characterized in that it is made of a forward and backward sensor (60) provided in a lock case (30) for stopping the motor (41). The method of claim 7, wherein The forward and backward sensors (60) are electronic door locks, characterized in that the light emitting unit (61) and the light receiving unit (62) pairs are formed on the left and right of the optical sensor, respectively. The method of claim 1, The interlocking means 50 includes a lever pin 23 for connecting the inner and outer lever handles 22 and 12; An actuating protrusion (51a) formed by the rotation of the lever pin (23) and coupled to the lever shaft (34) to rotate freely (51); A second rotating body 52 having a locking piece 52a coupled to the actuating protrusion 51a of the first rotating body 51 and having a coupling groove 52b formed at a lower side thereof; One side is hinged to the lock case 30, the center piece is coupled to the center of the coupling groove (52b) of the second rotating body (52) to move the circular arc around the hinge axis (53); Electronic door lock, characterized in that the connection is connected to the end of the operating piece (53) to one side is connected to the ratchet bolt (33) formed in the door frame and the spring (56d) is fixed.