electromagnetic lock

Abstract

An electromagnetic lock comprises a locking unit provided on a door and including an adsorption plate and at least one latch, and a magnetic lock unit provided on a door frame and including an electromagnetic device for adsorbing the adsorption plate, at least one latch device, and at least one limiting device. The latch device comprises a latch having a latch portion, and an elastic element. When the door is in a closed position, the adsorption plate faces the electromagnetic device, and the latch blocks the latch in a locked state at the latch portion. When the door is moved toward an open position, the latch drives the latch toward the latch portion to release the latch and change to an unlocked state. The limiting device comprises a limiting block and a driver. When the limiting block is in a released state, the limiting block does not restrict the latch from changing from the locked state to the unlocked state. When the limiting block is in a restricted state, the limiting block restricts the latch from changing from the locked state to the unlocked state.

Description

Technical Field

[0001] The present invention relates to a lock, in particular to an electromagnetic lock. Background Art

[0002] like Figure 1 、 Figure 2 As shown, there is an existing electric mechanical lock (Chinese invention patent number CN1300435C), which includes a latch assembly 1 set on a door frame 3 and a lock tongue 2 set on a door 4. The latch assembly 1 includes a housing 5, an arm 6 that can be moved forward and backward on the housing 5, two latch members 7 that are swingably pivoted on the housing 5, two compression springs 8 that abut between the housing 5 and the arm 6, and two compression springs 9 that abut between the housing 5 and the latch members 7. The lock tongue 2 has two protrusions 201, and the arm 6 can be in a first position (see Figure 1 ) and a second position (see Figure 2 ) and has two pins 601, each latch 7 can be in a release state (see Figure 1 ) and a locked state (see Figure 2 ) and has a hook 701 and an inclined surface 702.

[0003] By this, Figure 1 As shown, when the door is closed and locked and no other external force acts on the door 4, the arm 6 is pressed into the first position by the compression spring 8. The arm 6 can generate an electromagnetic attraction to attract the lock tongue 2, and the pins 601 will respectively block the inclined surfaces 702 of the latch 7, so that the latch 7 is in the released state and does not hook the protrusion 201. Thereafter, when an external force (such as human power or wind force) attempts to pull or push the door 4, if the external force is less than or equal to the elastic restoring force of the compression spring 8, the external force will not be able to drive the arm 6 to compress the compression spring 8, and the arm 6 will not be driven to the second position via the lock tongue 2 and the door 4 (see Figure 2 ), the latch 7 will not swing to the locked state (see Figure 2 ), therefore, when the magnitude of the external force is substantially equal to the elastic restoring force of the compression spring 8, the magnitude of the external force at this time can be defined as an upper limit wind resistance, that is, as long as the external force is less than the upper limit wind resistance, the door 4 will not be pushed or pulled by the external force.

[0004] like Figure 2As shown, when the external force is greater than the upper limit wind resistance and the door 4 is pulled or pushed, due to the inherent design, the electromagnetic attraction of the arm 6 is greater than the elastic restoring force of the compression spring 8. Therefore, the arm 6 will be driven to the second position via the lock tongue 2 and the door 4, and the compression spring 8 will be compressed. At this time, the pin 601 will slide away the inclined surface 702 of the latch 7 respectively, and the compression spring 9 will push the latch 7 inward to the locked state, so that the hook 701 of the latch 7 will hook the protrusion 201 of the lock tongue 2 respectively. In this way, the door 4 can be prevented from being further opened by the external force, thereby improving safety.

[0005] However, in actual use, after this type of electric mechanical lock has been used for a period of time, if the compression spring 8 produces elastic fatigue and causes the elastic restoring force to become smaller, the upper limit wind resistance will decrease accordingly, causing the arm 6 to be easily driven to the second position by the smaller external force, and the door 4 is often accidentally opened a crack; furthermore, due to the design of this type of electric mechanical lock, the electromagnetic attraction force of the arm 6 (for example, 30 kg weight) must be greater than the elastic restoring force of the compression spring 8 (for example, 29 kg weight), and the upper limit wind resistance is equal to the elastic restoring force of the compression spring 8, that is, the electromagnetic attraction force of the arm 6 > the elastic restoring force of the compression spring 8 = the upper limit wind resistance, therefore, the value of the upper limit wind resistance (for example, 29 kg weight) will at most be equal to the elastic restoring force of the compression spring 8, and cannot be closer to the electromagnetic attraction force of the arm 6. In addition, this type of electromechanical lock only uses the compression spring 9 to push the latch 7 to the locked state to produce a mechanical locking effect. When someone attempts to open the door violently, if the external force applied to the latch 7 (such as the force of pulling left and right) is too great, the latch 7 may be forced to swing outward until the hook 701 of the latch 7 disengages the protrusion 201, resulting in accidental unlocking. Summary of the Invention

[0006] An object of the present invention is to provide an electromagnetic lock that overcomes at least one of the disadvantages of the prior art.

[0007] The electromagnetic lock of the present invention is suitable for being installed on a door and a door frame. The door can be switched between an open position and a closed position relative to the door frame. The electromagnetic lock comprises a latching unit and a magnetic lock unit.

[0008] The clamping unit is suitable for being arranged on the door and comprises an adsorption plate and at least one buckle, wherein the adsorption plate has an adsorption plane.

[0009] The magnetic lock unit is suitable for being arranged on the door frame, and comprises an electromagnetic device, at least one locking device corresponding to the buckle, and at least one limiting device corresponding to the locking device.

[0010] The electromagnetic device is used to adsorb the adsorption plate and has a magnetic attraction plane. When the door is in the closed position, the adsorption plate faces the electromagnetic device, and the magnetic attraction plane can contact the adsorption plane.

[0011] The lock device includes a lock and an elastic element connected to the lock, the lock has a lock portion, and the lock can be transformed between a locked state in which the lock portion blocks the buckle and an unlocked state in which the lock portion releases the buckle. When the door is in the closed position, the lock is in the locked state. When the door changes from the closed position to the open position, the buckle drives the lock to change from the locked state to the unlocked state. The elastic element has potential energy to drive the lock to change from the unlocked state to the locked state.

[0012] The limit device includes a limit block and a driver, wherein the limit block can be transformed between a release state and a restriction state. When the limit block is in the release state, the limit block does not restrict the lock buckle from being transformed from the locked state to the unlocked state. When the limit block is in the restriction state, the limit block restricts the lock buckle from being transformed from the locked state to the unlocked state. The driver is used to drive the limit block to transform between the release state and the restriction state.

[0013] The electromagnetic lock of the present invention, the magnetic lock unit also includes a control device, which is electrically connected to the electromagnetic device and the driver, and is used to control whether the electromagnetic device generates electromagnetic attraction, and is used to control whether to drive the driver. When the door is in the closed position, the control device controls the electromagnetic device to generate electromagnetic attraction, so that the magnetic attraction plane attracts the adsorption plane of the adsorption plate, and the control device controls the driver to drive the limit block from the release state to the restriction state to lock the door. When the door is to be changed from the closed position to the open position, the control device controls the driver to drive the limit block from the restriction state to the release state, and the control device controls the electromagnetic device to stop generating electromagnetic attraction, so that the electromagnetic device releases the adsorption plate to unlock the door.

[0014] In the electromagnetic lock of the present invention, the magnetic lock unit further comprises a shell suitable for being arranged on the door frame, the electromagnetic device is arranged on the shell, the locking device is arranged on the shell, the limiting device is arranged on the shell, and the control device is arranged on the shell.

[0015] The electromagnetic lock of the present invention, the lock catch also has a pivot portion pivotally arranged on the shell, and a clamping portion, the elastic element abuts between the lock catch and the shell, the pivot portion is between the lock catch and the clamping portion, when the limit block is in the released state, the limit block does not restrict the clamping portion of the lock catch, when the limit block is in the restricted state, the limit block restricts the clamping portion of the lock catch.

[0016] The electromagnetic lock of the present invention, the shell has at least one first oblong hole extending in the horizontal direction, and at least one second oblong hole opposite to the first oblong hole, the limit block has a limiting portion, a pivotal portion slidingly connected to the first oblong hole and the second oblong hole, and a driven portion between the limiting portion and the pivotal portion, the driver has a valve body, a valve stem telescopically arranged on the valve body in the horizontal direction and connected to the driven portion, and a return spring arranged between the valve stem and the valve body, the return spring has potential energy to drive the valve stem to extend outward in the horizontal direction, when the limit block is in the released state, the limiting portion of the limit block does not block the clamping portion of the lock buckle, and when the limit block is in the restricted state, the limiting portion of the limit block blocks the clamping portion of the lock buckle.

[0017] In the electromagnetic lock of the present invention, when the lock buckle is in the locked state and the limit block is in the restricted state, the limit portion of the limit block is located between the electromagnetic device and the locking portion of the lock buckle in the horizontal direction, and the locking portion of the lock buckle is located between the limit portion and the pivotal portion of the limit block in the horizontal direction.

[0018] The electromagnetic lock of the present invention, the clamping unit includes two buckles arranged at intervals at both ends of the adsorption plate in the horizontal direction, the adsorption plane is between the buckles in the horizontal direction, the magnetic lock unit includes two locking devices corresponding to the buckles respectively, and two limiting devices corresponding to the locking devices respectively, the locking devices are arranged at intervals on the shell in the horizontal direction, the limiting devices are arranged at intervals on the shell in the horizontal direction, and the electromagnetic device is between the locking devices and the limit blocks of the limiting devices in the horizontal direction.

[0019] The electromagnetic lock of the present invention comprises an electromagnetic device including an electromagnetic body and a coil wound around the electromagnetic body, the electromagnetic body having the magnetic attraction plane, the control device including a circuit board module arranged on the electromagnetic body and a trigger module arranged on the electromagnetic body, the circuit board module being electrically connected to the electromagnetic device and the driver, when the door is in the closed position, the adsorption plate contacts the trigger module, the trigger module prompts the circuit board module to control the electromagnetic device to generate electromagnetic attraction, so that the magnetic attraction plane attracts the adsorption plane of the adsorption plate, the circuit board module is also prompted to control the driver to drive the limit block to change from the release state to the restriction state to lock the door, when the door is about to change from the closed position to the open position, the circuit board module controls the driver to drive the limit block to change from the restriction state to the release state, the circuit board module also controls the electromagnetic device to stop generating electromagnetic attraction, so that the electromagnetic device releases the adsorption plate to unlock the door.

[0020] The beneficial effect of the present invention is that when the door is in the closed position, the electromagnetic attraction of the electromagnetic device is directly used to attract the adsorption plate. When an external force (such as manpower or wind force) attempts to pull or push the door, as long as the external force is less than or equal to the electromagnetic attraction of the electromagnetic device, the external force cannot pull the adsorption plate away from the electromagnetic device. Therefore, the upper limit wind resistance of the present invention is essentially equal to the electromagnetic attraction of the electromagnetic device. In this way, under the condition of the same electromagnetic attraction, since the upper limit wind resistance of the present invention is essentially equal to the electromagnetic attraction of the electromagnetic device, the value of the upper limit wind resistance of the present invention is greater than the upper limit wind resistance of the prior art, making it less likely that the door will be pushed open or pulled open by the external force relative to the door frame. In addition, the present invention utilizes the design of the limiting device in conjunction with the locking device. When the door is in the closed position, the driver of the limiting device will actively drive the limiting block to swing to the limiting state to limit the lock of the locking device to the locked state, thereby locking the door. Since the driver of the limiting device will not have the problem of elastic fatigue, and the electromagnetic device can generate stable electromagnetic attraction to the adsorption plate, the present invention will not have the problem of decreased upper limit wind resistance in the prior art after being used for a period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic top view of an incomplete state of use of a conventional electromechanical lock, illustrating an arm-shaped member of the electromechanical lock in a first position and two latching members of the electromechanical lock in a released state;

[0022] Figure 2 It is similar to Figure 1 , illustrating the arm in a second position and the latch in a locked state;

[0023] Figure 3 It is a partially exploded perspective view of an embodiment of an electromagnetic lock of the present invention;

[0024] Figure 4 is an exploded perspective view of this embodiment;

[0025] Figure 5 is a cross-sectional view of the embodiment, illustrating that a card unit of the embodiment is installed on a door, and a magnetic lock unit of the embodiment is installed on a door frame;

[0026] Figure 6 It is along Figure 5 A sectional view taken along line VI-VI in FIG.

[0027] Figure 7 is a combined three-dimensional diagram of one of the two locking devices of the magnetic lock unit;

[0028] Figure 8 It is a partially exploded perspective view illustrating the two limiting devices of the magnetic lock unit;

[0029] Figure 9 It is similar to Figure 5 , illustrating that the door moves with the locking unit until the two latches of the locking unit are in contact with the latch of the locking device, and a trigger pin of a trigger module of a control device of the magnetic lock unit is in an untriggered position;

[0030] Figure 10 It is similar to Figure 9 , illustrating that the buckle pushes the lock of the locking device from a locked state to an unlocked state;

[0031] Figure 11 It is similar to Figure 10 , showing that the door is in a closed position, the lock of the lock device is reset to the locked state, the limit block of the limit device is swung to a restricted state, and the trigger pin is in a trigger position;

[0032] Figure 12 It is similar to Figure 11 , illustrating that the limit stopper of the limit device swings to a released state;

[0033] Figure 13 It is similar to Figure 12 , illustrating that the door moves with the latch unit to the latch to push the latch of the latch device from the locked state to the unlocked state;

[0034] Figure 14 It is similar to Figure 13 , illustrating that the door is in an open position, the latch unit moves with the door until the latch disengages the latch of the locking device, and the latch of the locking device is reset to the locked state;

[0035] Figure 15 It is similar to Figure 11 , indicating that the door is forcibly opened by an external force, and the buckle drives the lock buckle of the lock device to push the limit block of the limit device inward until it is blocked by an electromagnetic body of an electromagnetic device of the magnetic lock unit;

[0036] Figure 16 It is along Figure 15 A sectional view taken along line XVI-XVI in FIG. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0038] See Figure 3 、 Figure 4 、 Figure 5 , is an embodiment of the electromagnetic lock 100 of the present invention, which is suitable for installation on a door 200 and a door frame 300. The door 200 can be in an open position relative to the door frame 300 (see Figure 5 ) and a closed position (see Figure 11 ) between the switching modes, the electromagnetic lock 100 includes a card unit 10 and a magnetic lock unit 20.

[0039] The latching unit 10 is adapted to be disposed on the door 200 and includes a suction plate 11 and two latches 12 spaced apart at opposite ends of the suction plate 11 in a transverse direction X. The suction plate 11 has a suction plane 111 disposed between the latches 12 in the transverse direction X. It will be appreciated that in other variations of this embodiment, the number of the latch 12 may also be one.

[0040] like Figure 4 、 Figure 5 、 Figure 6 As shown, the magnetic lock unit 20 is suitable for being installed in the door frame 300 and includes a housing 30 suitable for being installed in the door frame 300, a protective shell 40 covering the housing 30 and having a U-shaped cross-section, an electromagnetic device 50, two locking devices 60 corresponding to the buckles 12, two limiting devices 70 corresponding to the locking devices 60, and a control device 80. It is understood that in other variations of this embodiment, the number of the locking device 60 and the limiting device 70 can also be one.

[0041] In this embodiment, the housing 30 has two end walls 31 arranged opposite to each other in the transverse direction X, a first side wall 32 extending along the transverse direction X and locked to the end wall 31, and a second side wall 33 opposite to the first side wall 32 in a height direction Z and locked to the end wall 31.

[0042] The first side wall 32 has two first oblong holes 321 extending along the transverse direction X and spaced apart from each other in the transverse direction X.

[0043] The second side wall 33 has two second oblong holes 331 extending along the transverse direction X and spaced apart from each other in the transverse direction X. The second oblong holes 331 are opposite to the first oblong holes 321. It is understood that in other variations of this embodiment, the number of the first oblong hole 321 and the number of the second oblong hole 331 can also be one.

[0044] The electromagnetic device 50 is disposed on the housing 30 and is used to attract the attraction plate 11 . The electromagnetic device 50 includes an electromagnetic body 51 and a coil 52 wound around the electromagnetic body 51 . The electromagnetic body 51 has a magnetic attraction surface 511 .

[0045] like Figure 11 As shown, when the door 200 is in the closed position, the adsorption plate 11 faces the electromagnetic device 50 , and the magnetic attraction plane 511 can contact the adsorption plane 111 .

[0046] like Figure 4 、 Figure 5 、 Figure 6 As shown, the locking devices 60 are disposed on the housing 30 at intervals in the transverse direction X. Each locking device 60 includes a locking buckle 61 and an elastic element 62 connected to the locking buckle 61 .

[0047] like Figure 5 、 Figure 7 As shown, the lock 61 has a lock portion 611 , a pivot portion 612 pivoted to the housing 30 , and a locking portion 613 . The pivot portion 612 is located between the lock portion 611 and the locking portion 613 .

[0048] The lock 61 of each locking device 60 can block the locking state of the respective buckle 12 at one locking portion 611 (see Figure 11 ) and one of the locking portions 611 releases the respective buckles 12 from the unlocked state (see Figure 10 ) between them.

[0049] like Figure 11 As shown, when the door 200 is in the closed position, the lock catch 61 is in the locked state. Figure 12 、 Figure 13 、 Figure 14 As shown, when the door 200 is moved from the closed position (see Figure 12 ) towards the door opening position (see Figure 14 ) when each buckle 12 drives the lock 61 of the respective lock device 60 from the locked state (see Figure 12 ) towards the unlocked state (see Figure 13 ) transformation, the elastic element 62 has the function of driving the lock 61 from the unlocked state (see Figure 13 ) towards the locked state (see Figure 14 )The potential energy of the transformation.

[0050] like Figure 5 、 Figure 6 、 Figure 8 As shown, the limiting devices 70 are arranged at intervals on the housing 30 in the horizontal direction X, and each limiting device 70 includes a limiting block 71 and a driver 72. In this embodiment, the electromagnetic device 50 is located between the locking device 60 and the limiting block 71 of the limiting device 70 in the horizontal direction X.

[0051] The limit stopper 71 can be in a released state (such as Figure 9 ) and a restricted state (as shown Figure 11 As shown in the figure, the limit stopper 71 has a limit portion 711, a pivot portion 712, and a driven portion 713 between the limit portion 711 and the pivot portion 712.

[0052] The pivotal portion 712 is slidably connected to one of the first oblong holes 321 and one of the second oblong holes 331 corresponding to the first side wall 32 and the second side wall 33. In the present embodiment, it can be understood that the pivotal portion 712 can rotate relative to the corresponding one of the first oblong holes 321 and one of the second oblong holes 331. In addition, the pivotal portion 712 can also move along the horizontal direction X relative to the corresponding one of the first oblong holes 321 and one of the second oblong holes 331.

[0053] In this embodiment, the driven portion 713 has two embedded grooves 714 spaced apart in the height direction Z (see FIG. Figure 8 ).

[0054] The driver 72 is used to drive the limit stopper 71 to the release state (such as Figure 9 ) and the limit state (as shown Figure 11 shown).

[0055] The actuator 72 includes a valve body 721, a valve stem 722 that is telescopically disposed on the valve body 721 along the transverse direction X and connected to the driven portion 713, and a return spring 723 disposed between the valve stem 722 and the valve body 721. The return spring 723 has potential energy that drives the valve stem 722 to extend outward along the transverse direction X. In this embodiment, the actuator 72 is a solenoid valve.

[0056] In this embodiment, the driver 72 of one of the limit devices 70 is fixed to the first side wall 32, and the valve stem 722 of the driver 72 of one of the limit devices 70 is slidably engaged with one of the higher embedding grooves 714 of the driven portion 713 of the limit block 71 of one of the limit devices 70; the driver 72 of the other limit device 70 is fixed to the second side wall 33, and the valve stem 722 of the driver 72 of the other limit device 70 is slidably engaged with one of the lower embedding grooves 714 of the driven portion 713 of the limit block 71 of the other limit device 70.

[0057] like Figure 12 As shown, when the limit block 71 is in the released state, the limit block 71 does not restrict the locking portion 613 of the lock buckle 61. Further, the limit portion 711 of the limit block 71 does not prevent the locking portion 613 of the lock buckle 61 from swinging inward, so that the limit block 71 does not restrict the lock buckle 61 from the locked state (see FIG. Figure 12 ) to the unlocked state (see Figure 13 ).

[0058] like Figure 11 As shown, when the limit block 71 is in the restricted state, the limit block 71 limits the locking portion 613 of the lock buckle 61. Further, the limit block 71 will prevent the locking portion 613 of the lock buckle 61 from swinging inward, so that the limit block 71 limits the lock buckle 61 from the locked state (see FIG. Figure 11 ) to the unlocked state (see Figure 13 ).

[0059] like Figure 11 As shown, when the lock buckle 61 is in the locked state and the limit block 71 is in the restricted state, the limit portion 711 of the limit block 71 is between the electromagnetic body 51 of the electromagnetic device 50 and the clamping portion 613 of the lock buckle 61 in the horizontal direction X, and the clamping portion 613 of the lock buckle 61 is between the limit portion 711 and the pivot portion 712 of the limit block 71 in the horizontal direction X.

[0060] like Figure 4 、 Figure 5As shown, the control device 80 is disposed in the housing 30 , and the control device 80 is electrically connected to the electromagnetic device 50 and the driver 72 , and is used to control whether the electromagnetic device 50 generates electromagnetic attraction and whether to drive the driver 72 .

[0061] The control device 80 includes a circuit board module 81 disposed on the electromagnetic body 51 and a trigger module 82 disposed on the electromagnetic body 51. The circuit board module 81 is electrically connected to the electromagnetic device 50 and the driver 72.

[0062] By this, Figure 9 、 Figure 10 As shown, when the user moves the door 200 from the open position (see Figure 5 ) towards the closed position (see Figure 11 ) is closed, each buckle 12 of the locking unit 10 will first contact the locking portion 611 of the locking portion 61 of the locking device 60, and then each buckle 12 will push the locking portion 611 of the locking portion 61 of the locking device 60 outward, so that the locking portion 61 of the locking device 60 is locked (see FIG. Figure 9 ) to the unlocked position (see Figure 10 ); Next, if Figure 10 、 Figure 11 As shown, when the door 200 moves to the closed position, each latch 12 slides inwardly along the longitudinal direction Y through the latch portion 611 of the latch 61 of the respective latch device 60. At this time, the elastic restoring force of the elastic element 62 of each latch device 60 will release the latch 61 of each latch device 60 from the unlocked state (see FIG. Figure 10 ) is pushed back to the locked state (see Figure 11 ), so that the locking portion 611 of the locking buckle 61 of each locking device 60 is blocked on the outside of the respective buckle 12 to limit the door 200 from driving the card unit 10 to move outward. At the same time, the adsorption plane 111 of the adsorption plate 11 will contact the magnetic attraction plane 511 of the electromagnetic body 51, and the adsorption plane 111 of the adsorption plate 11 will touch the trigger module 82. In this way, the trigger module 82 of the control device 80 will prompt the circuit board module 81 to control the electromagnetic device 50 to generate electromagnetic attraction, so that the magnetic attraction plane 511 of the electromagnetic body 51 attracts the adsorption plane 111 of the adsorption plate 11, and the circuit board module 81 of the control device 80 will be prompted to control the driver 72 of each limiting device 70 to drive the limit block 71 of each limiting device 70 from the released state (see Figure 10 ) swings to the limit state (see Figure 11), so as to limit the lock 61 of each locking device 60 to the locked state, thereby locking the door 200. Preferably, the circuit board module 81 of the control device 80 will first control the electromagnetic device 50 to generate electromagnetic attraction, and then control the driver 72 of each limiting device 70 to swing the limit block 71 of each limiting device 70 to the restricted state (see Figure 11 ). It is understood that the trigger module 82 can use a magnetic element 821 to trigger a magnetic sensing element 811 (such as a Hall element) on the circuit board module 81, but is not limited thereto. On the contrary, if Figure 12 、 Figure 13 、 Figure 14 As shown, when the user wants to open the door 200 from the closed position (see Figure 12 ) towards the door opening position (see Figure 14 ) is opened, a switch (not shown) or a remote controller (not shown) electrically connected to the circuit board module 81 of the control device 80 can be used to transmit a control signal to the circuit board module 81 of the control device 80, so that the circuit board module 81 of the control device 80 controls the driver 72 of each limiting device 70 to drive the limiting block 71 of each limiting device 70 from the limiting state (see Figure 11 ) swings to the release state (see Figure 12 ) so as to no longer restrict the locks 61 of the respective locking devices 60, and to enable the circuit board module 81 of the control device 80 to control the electromagnetic device 50 to stop generating electromagnetic attraction, so that the electromagnetic device 50 releases the adsorption plate 11 to unlock the door 200. Preferably, the circuit board module 81 of the control device 80 will first control the driver 72 to swing the limit block 71 of each limit device 70 to the release state, and then control the electromagnetic device 50 to stop generating electromagnetic attraction.

[0063] Thus, when the user moves the door 200 from the closed position (see Figure 12 ) towards the door opening position (see Figure 14 ) in the process of opening, such as Figure 12 、 Figure 13 As shown, each buckle 12 of the locking unit 10 will first contact the locking portion 611 of the locking portion 61 of the locking device 60, and then each buckle 12 will push the locking portion 611 of the locking portion 61 of the locking device 60 outward, so that the locking portion 61 of the locking device 60 is locked (see FIG. Figure 12 ) to the unlocked position (see Figure 13 ), thereafter, if Figure 14As shown, after each buckle 12 slides outward along the longitudinal direction Y through the locking portion 611 of the locking buckle 61 of each locking device 60, the elastic restoring force of the elastic element 62 of each locking device 60 will release the locking buckle 61 of each locking device 60 from the unlocked state (see Figure 13 ) is pushed back to the locked state (see Figure 14 ) and wait for the next closing.

[0064] In addition, if Figure 15 、 Figure 16 As shown, after the door 200 is locked, if an outsider wants to open the door violently and forcibly pulls the door 200 outward until the adsorption plate 11 is disengaged from the electromagnetic body 51, at this time, since the limiting portion 711 of the limiting block 71 of each limiting device 70 is between the electromagnetic body 51 of the electromagnetic device 50 and the locking portion 613 of the lock 61 of the respective lock device 60 in the horizontal direction X, and the pivoting portion 712 of the limiting block 71 of each limiting device 70 is slidably connected to one of the first oblong holes 321 and one of the second oblong holes 331 corresponding to the first side wall 32 and the second side wall 33, therefore, when the door 200 is locked, the outsider wants to open the door violently and forcibly pull the door 200 outward until the adsorption plate 11 is disengaged from the electromagnetic body 51. When each latch 12 pushes the latch portion 611 of the latch 61 of the respective latch device 60 outward, forcing the engaging portion 613 of the latch 61 of the respective latch device 60 to swing inward, the engaging portion 613 of the latch 61 of each latch device 60 can only push the limiting portion 711 of the limiting block 71 of the respective limiting device 70 inward along the transverse direction X until it abuts against one end of the electromagnetic body 51. After that, the limiting block 71 of the respective limiting device 70 cannot be pushed inward any further. In this way, the door 200 can be prevented from being forcibly unlocked and the limiting block 71 and the driver 72 of each limiting device 70 from being torn apart.

[0065] Through the above description, the advantages of the present invention can be summarized as follows:

[0066] 1. When the door 200 is in the closed position, the present invention directly utilizes the electromagnetic attraction of the electromagnetic device 50 to attract the adsorption plate 11. When an external force (such as human power or wind) attempts to pull or push the door 200, as long as the external force is less than or equal to the electromagnetic attraction of the electromagnetic device 50, the external force cannot pass through the door 200 to pull the adsorption plate 11 away from the electromagnetic device 50. Therefore, the upper limit wind resistance of the present invention is substantially equal to the electromagnetic attraction of the electromagnetic device 50. Compared with the prior art, since the upper limit wind resistance of the present invention is substantially equal to the electromagnetic attraction of the electromagnetic device 50, under the condition of the same electromagnetic attraction (such as 30 kg), the value of the upper limit wind resistance of the present invention (such as 30 kg) is greater than the upper limit wind resistance of the prior art, making the door 200 less likely to be pushed open or opened by the external force relative to the door frame 300.

[0067] 2. The present invention utilizes the design of the limiting device 70 in conjunction with the locking device 60. When the door 200 is in the closed position and the lock 61 of each locking device 60 swings to the locked state, the driver 72 of each limiting device 70 drives the limiting block 71 of each limiting device 70 to swing to the restricted state, so as to actively limit the lock 61 of the respective locking device 60 to the locked state, thereby locking the door 200. Compared with the prior art, the latch 7 is passively locked only after the external force overcomes the elastic restoring force of the compression spring 8. Since the driver 72 of the limiting device 70 of the present invention is a solenoid valve, the problem of elastic fatigue of the compression spring 8 in the prior art will not occur, and the electromagnetic device 50 can generate a stable electromagnetic attraction to the adsorption plate 11. Therefore, after being used for a period of time, the present invention will not cause the problem of decreased upper wind resistance in the prior art.

[0068] 3. Compared with the prior art, after the door 200 is locked, the present invention utilizes the limiting portion 711 of the limiting block 71 of each limiting device 70 to be located between the electromagnetic body 51 of the electromagnetic device 50 and the locking portion 613 of the lock 61 of each lock device 60 in the horizontal direction X, and the design of the pivoting portion 712 of the limiting block 71 of each limiting device 70 slidingly connected to the first oblong hole 321 of the first side wall 32 and the second oblong hole 331 of the second side wall 33 can be used to block each limiting device 70 by the electromagnetic body 51 when an outsider attempts to open the door violently. The limiting portion 711 of the limiting block 71 enables the limiting block 71 of each limiting device 70 in the limiting state to slide inwardly only to a limited extent along the horizontal direction X. In this way, it can not only effectively prevent the lock 61 of each locking device 60 from being pushed to the unlocking device by external force to prevent accidental unlocking, but also prevent the limiting block 71 and the driver 72 of each limiting device 70 from being torn by external force. As a result, the limiting block 71 of each limiting device 70 can adopt a lightweight structural design, and each limiting device 70 can adopt a smaller-sized driver 72, thereby saving power.

[0069] 4. According to the present invention, before the door 200 is locked or unlocked, the control device 80 will control the electromagnetic device 50 to absorb the adsorption plate 11 to prevent the door from being driven by an external force (such as wind) and linking the adsorption plate 11, so that the buckles 12 located at both ends of the adsorption plate 11 will not mistakenly drive the lock 61 of the locking device 60 to jam the limit block 71 of the limiting device 70, and ensure that the limit block 71 of the limiting device 70 can smoothly switch between the release state and the restriction state, thereby allowing the lock 61 of the locking device 60 to be normally restricted or released by the limit block 71 of the limiting device 70, so as to smoothly lock or unlock the door 200.

[0070] In summary, the electromagnetic lock of the present invention can effectively improve the security of the door, and thus can indeed achieve the purpose of the present invention.

[0071] The above descriptions are merely embodiments of the present invention and should not be used to limit the scope of the present invention. In other words, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims

1. An electromagnetic lock, adapted to be mounted between a door and a door frame, wherein the door can be shifted relative to the door frame between an open position and a closed position, the electromagnetic lock comprising a latching unit and a magnetic locking unit, characterized in that: The clamping unit is suitable for being arranged on the door and comprises an adsorption plate and at least one buckle, wherein the adsorption plate has an adsorption plane; and The magnetic lock unit is suitable for being arranged on the door frame and comprises an electromagnetic device, at least one locking device corresponding to the buckle, and at least one limiting device corresponding to the locking device. The electromagnetic device is used to adsorb the adsorption plate and has a magnetic surface. When the door is in the closed position, the adsorption plate faces the electromagnetic device, and the magnetic surface can contact the adsorption surface. The lock catch device includes a lock catch and an elastic element connected to the lock catch, the lock catch having a lock catch portion, and the lock catch can be switched between a locked state in which the lock catch portion blocks the buckle and an unlocked state in which the lock catch portion releases the buckle. When the door is in the closed position, the lock catch is in the locked state. When the door is switched from the closed position to the open position, the buckle drives the lock catch to switch from the locked state to the unlocked state. The elastic element has potential energy that drives the lock catch to switch from the unlocked state to the locked state. The limit device includes a limit block and a driver, wherein the limit block can be transformed between a release state and a restriction state. When the limit block is in the release state, the limit block does not restrict the lock buckle from being transformed from the locked state to the unlocked state. When the limit block is in the restriction state, the limit block restricts the lock buckle from being transformed from the locked state to the unlocked state. The driver is used to drive the limit block to transform between the release state and the restriction state.

2. The electromagnetic lock according to claim 1, characterized in that: The magnetic lock unit also includes a control device, which is electrically connected to the electromagnetic device and the driver, and is used to control whether the electromagnetic device generates electromagnetic attraction and whether to drive the driver. When the door is in the closed position, the control device controls the electromagnetic device to generate electromagnetic attraction so that the magnetic plane attracts the adsorption plane of the adsorption plate. The control device also controls the driver to drive the limit block from the released state to the restricted state to lock the door. When the door is to be changed from the closed position to the open position, the control device controls the driver to drive the limit block from the restricted state to the released state. The control device also controls the electromagnetic device to stop generating electromagnetic attraction, so that the electromagnetic device releases the adsorption plate to unlock the door.

3. The electromagnetic lock according to claim 2, characterized in that: The magnetic lock unit further includes a shell suitable for being arranged on the door frame, the electromagnetic device is arranged on the shell, the locking device is arranged on the shell, the limiting device is arranged on the shell, and the control device is arranged on the shell.

4. The electromagnetic lock according to claim 3, characterized in that: The lock buckle also has a pivoting portion pivotally arranged on the shell, and a clamping portion. The elastic element abuts between the lock buckle and the shell, and the pivoting portion is between the lock buckle and the clamping portion. When the limit block is in the released state, the limit block does not restrict the clamping portion of the lock buckle. When the limit block is in the restricted state, the limit block restricts the clamping portion of the lock buckle.

5. The electromagnetic lock according to claim 4, characterized in that: The shell has at least one first oblong hole extending in the transverse direction and at least one second oblong hole opposite to the first oblong hole, the limit block has a limiting portion, a pivotal portion slidingly connected to the first oblong hole and the second oblong hole, and a driven portion between the limiting portion and the pivotal portion, the driver has a valve body, a valve stem telescopically arranged on the valve body in the transverse direction and connected to the driven portion, and a return spring arranged between the valve stem and the valve body, the return spring having potential energy to drive the valve stem to extend outward in the transverse direction, when the limit block is in the released state, the limiting portion of the limit block does not block the clamping portion of the lock buckle, and when the limit block is in the restricted state, the limiting portion of the limit block blocks the clamping portion of the lock buckle.

6. The electromagnetic lock according to claim 5, characterized in that: When the lock is in the locked state and the limit block is in the restricted state, the limit portion of the limit block is between the electromagnetic device and the clamping portion of the lock in the horizontal direction, and the clamping portion of the lock is between the limit portion and the pivotal portion of the limit block in the horizontal direction.

7. The electromagnetic lock according to claim 3, characterized in that: The clamping unit includes two clamps arranged at intervals at both ends of the adsorption plate in the horizontal direction, and the adsorption plane is located between the clamps in the horizontal direction. The magnetic lock unit includes two locking devices corresponding to the clamps respectively, and two limiting devices corresponding to the locking devices respectively. The locking devices are arranged at intervals on the shell in the horizontal direction, and the limiting devices are arranged at intervals on the shell in the horizontal direction. The electromagnetic device is located between the locking devices and between the limit blocks of the limiting devices in the horizontal direction.

8. The electromagnetic lock according to claim 3, characterized in that: The electromagnetic device includes an electromagnetic body and a coil wound around the electromagnetic body, the electromagnetic body has the magnetic attraction plane, the control device includes a circuit board module arranged on the electromagnetic body, and a trigger module arranged on the electromagnetic body, the circuit board module is electrically connected to the electromagnetic device and the driver, when the door is in the closed position, the adsorption plate contacts the trigger module, the trigger module prompts the circuit board module to control the electromagnetic device to generate electromagnetic attraction, so that the magnetic attraction plane attracts the adsorption plane of the adsorption plate, and the circuit board module is prompted to control the driver to drive the limit block to change from the release state to the restriction state to lock the door, when the door is about to change from the closed position to the open position, the circuit board module controls the driver to drive the limit block to change from the restriction state to the release state, and the circuit board module controls the electromagnetic device to stop generating electromagnetic attraction, so that the electromagnetic device releases the adsorption plate to unlock the door.

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