Patent Publication Number: US-2023146856-A1

Title: Unlocking key for port lock of electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a Continuation of PCT/KR2021/008346 filed on Jul. 1, 2021, which claims priority from Korean Application No. 10-2020-0089056 filed on Jul. 17, 2020. The aforementioned applications are incorporated herein by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to an unlocking key which unlocks a port lock for locking a port of an electronic device. More particularly, the present disclosure relates to an unlocking key for a port lock of an electronic device which can unlock the port lock (a blocking module) coupled to a port so as to physically block the port which is provided in the electronic device such that an external device can be connected to the port. 
     RELATED ART 
     Recently, incidents in which outsiders or non-administrators infiltrate financial institutions or government-affiliated institutions to withdraw data stored in computers have occurred, which caused a great social impact. In preparation for this, various countermeasures have been proposed. 
     Considering this point, recently, various technologies have been proposed to physically block a USB port of a computer, network equipment, and electronic products so as to prevent the connection of unauthorized data transmission cables or connectors thereto. 
     In addition, various methods and devices for physically blocking a LAN port, that is, a network port to which a LAN cable is connected so as to block data withdrawal through the network port have been proposed. 
     To this end, the present applicant has developed a device for locking a USB port, a device for locking a LAN port, and a device for locking a network port lock, etc. 
     Meanwhile, a lock device for physically blocking a port of an electronic device includes a locking member inserted into a port to directly block the port, and a key member used to take out the locking member from the port. Here, the key member is inserted into a key recess of the locking member and unlock the locking member to take out the locking member from the port, and includes a pattern key corresponding to a pattern recess formed inside the key recess. However, since the pattern key and the pattern recess are designed and manufactured for each lock device, the locking member can be separated from the port only by using the key member having the pattern key matching the pattern recess of the locking member. 
     That is, the locking member can be separated from the port by pulling the pattern key after simply inserting the pattern key into the key recess of the locking member such that the pattern key is held in the pattern recess. However, in this case, even if patterns of the pattern recess and the pattern key do not match each other, the locking member may be forcibly removed from the port by allowing a part of the pattern key to be partially held in the pattern recess inside the key recess. 
     Accordingly, in consideration of this, development of a lock device which can lock the port of an electronic device more reliably as well as development of a dedicated unlocking key for unlocking the port lock which can unlock the port lock by using only an unlocking key allowed for each lock device are required. 
     SUMMARY 
     The present disclosure has been made keeping in mind the above problems occurring in the prior art and is intended to propose an unlocking key for a port lock of an electronic device which can effectively unlock the port lock (a blocking module) of the electronic device which securely can lock a port of the electronic device. 
     In order to accomplish the above objective, the present disclosure provides an unlocking key for a port lock of an electronic device for unlocking and separating, from a port of the electronic device, a blocking module which is inserted into and coupled to the port of the electronic device and has a key recess in which a pattern part and a latch key holding recess are formed on different inner surfaces of the key recess, the unlocking key including: 
     a main body casing; a movable housing installed to protrude from a front end of the main body casing; a pattern key which is fixedly installed to protrude from a front end of the movable housing and has a pattern formed on an end part of the pattern key such that the pattern corresponds to the pattern part of the key recess when the pattern key is inserted into the key recess; a latch key which protrudes from the front end of the movable housing and is held in the latch key holding recess inside the key recess by approaching and moving away from opposite sides of the pattern key while the latch key is elastically transformed; and a manipulation part which is movably installed in the main body casing and controls reciprocating of the movable housing and opening and closing of the latch key. 
     Accordingly, the blocking module which is inserted into the port and is locked may be easily unlocked and separated from the port. 
     Here, the main body casing may include: a lower casing having a fixing slit formed in a bottom therein; and an upper casing coupled to an upper part of the lower casing, wherein a guide member may be fixedly installed on the fixing slit, the guide member being configured to guide the movement of the movable housing and having a stopper recess which limits a protruding distance of the movable housing outward from the main body casing. 
     Accordingly, when the unlocking key is not used, the size of the unlocking key may be reduced such that the unlocking key is easily stored and carried. 
     In addition, the movable housing may include: a lower housing having an elastic protrusion formed by protruding downward therefrom such that the elastic protrusion is elastically inserted into and coupled to the stopper recess of the guide member, the lower housing being configured to reciprocate along the guide member; and an upper housing which is coupled to an upper part of the lower housing, wherein a portion of the pattern key and a portion of the latch key are received and installed in space between the upper housing and the lower housing. 
     Accordingly, the movement and position fixing operation of the movable housing may be performed separately. 
     Furthermore, the pattern key may have a plate shape, and a first end part of the pattern key may be fixed inside the movable housing and a second end part thereof may protrude from the front end of the movable housing, wherein the pattern corresponding to the pattern part of the key recess may be formed on a front end of the pattern key, 
     and the latch key may include: a latch key body which is installed inside the movable housing and has a pair of elastic parts bending and extending from a connection part to face each other at opposite sides relative to the connection part; and latch key parts each having a plate shape, the latch key parts being respectively integrally formed on end parts of the elastic parts by bending and extending therefrom and being disposed at the opposite sides of the pattern key. 
     Accordingly, the pattern key and the latch key may be separately used, and the blocking module may be unlocked by using only the unlocking key having the pattern key corresponding to the shape of the key recess of the blocking module. 
     In addition, the latch key parts may be disposed respectively at the opposite sides of the pattern key by extending with the same heights and the same thicknesses, each of the latch key parts including: a holding jaw held by an end portion of a rear end of the pattern key; a guide surface formed on an outer edge of the latch key part and inclined to receive pressure such that the latch key parts are closed by being pressed by external force; and a holding protrusion which is formed on an end of the latch key part by protruding outward therefrom and is held in the latch key holding recess inside the key recess. 
     Accordingly, the opening and closing of the latch key may be performed in conjunction with the manipulation part. 
     Furthermore, the manipulation part may include: a movable member which is installed to reciprocate a predetermined distance inside the movable housing and interferes with the latch key parts to be opened or closed according to a moving position of the movable member; a main manipulation knob which is connected to the movable member and is installed on an outer side of the main body casing such that the main manipulation knob reciprocates; and a sub manipulation knob which is connected rotatably to the movable member and is able to protrude to an outside from the movable housing and the main body casing. 
     Accordingly, the opening of the latch key may be performed by selectively using the main manipulation knob and the sub manipulation knob and thus may be easily performed by using the sub manipulation knob in a narrow environment in which it is difficult to use the main manipulation knob. 
     In addition, the movable member may include: a movable member body having a first coupling part which is installed to reciprocate inside the movable housing, the first coupling part being formed on an upper part of the movable member and coupled to the main manipulation knob, a second coupling part which is formed on a side surface of a rear end of the movable member and to which the sub manipulation knob is rotatably coupled, and an elastic protrusion which is formed by protruding to an upper side of the movable member body and is selectively held by a holding protrusion formed on the upper housing; and an operation part which extends from the movable member body and selectively interferes with and operates the latch key, 
     wherein the operation part may have a pair of unlocking interference ribs which supports the latch key body of the latch key from an outside of the latch key body and interferes with the latch key parts to be closed while moving, and a holding protrusion which is disposed between the unlocking interference ribs and allows the latch key parts to be opened. 
     According to the unlocking key for a port lock of an electronic device of the present disclosure, the port lock (a blocking module) which is inserted into a port of an electronic device such as a USB port and is locked can be unlocked and separated from the port. 
     That is, when the pattern key of the unlocking key is completely inserted into the key recess of the port lock (the blocking module), the latch key of the unlocking key is configured to reach a position at which the latch key can be held in the latch key holding recess inside the key recess, so it is impossible to separate the port lock (the blocking module) from a port of an electronic device by using a tool other than the unlocking key authorized in advance. Accordingly, the port of the electronic device can be more reliably blocked to increase security. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic configuration diagram illustrating a port locking apparatus to which an unlocking key according to an embodiment of the present disclosure is applied. 
         FIG.  2    is a perspective view illustrating a port lock (a blocking module) illustrated in  FIG.  1   . 
         FIGS.  3  and  4    are exploded perspective views of the blocking module illustrated in  FIG.  2   . 
         FIGS.  5  and  7    are perspective views illustrating a state in which a locking module and a pattern module of  FIG.  3    are coupled to each other. 
         FIG.  6    is a bottom view of  FIG.  5   . 
         FIG.  8    is a top plan view illustrating a state in which the pattern module of the blocking module is located at an unlocking position. 
         FIG.  9    is a sectional view taken along line I-I of  FIG.  8   . 
         FIG.  10    is a sectional view taken along line II-II of  FIG.  8   . 
         FIG.  11    is a sectional view taken along line III-III of  FIG.  8   . 
         FIG.  12    is a top plan view illustrating a state in which the pattern module of the blocking module is located at a locking position. 
         FIG.  13    is a sectional view taken along line IV-IV of  FIG.  12   . 
         FIG.  14    is a sectional view taken along line V-V of  FIG.  12   . 
         FIG.  15    is a sectional view taken along line VI-VI of  FIG.  12   . 
         FIG.  16    is a sectional view illustrating a state in which a pattern key and a latch key of the unlocking key are coupled to a key recess in the state of  FIG.  13   . 
         FIG.  17    is a top plan view illustrating the unlocking key for a port lock of an electronic device according to the embodiment of the present disclosure illustrated in  FIG.  1   . 
         FIG.  18    is a perspective view of the unlocking key illustrated in  FIG.  17   . 
         FIGS.  19  and  20    are exploded perspective views of the unlocking key illustrated in  FIG.  17   . 
         FIG.  21    is a top plan view illustrating a state in which an upper casing is removed from the unlocking key in  FIG.  18   . 
         FIG.  22    is a cross-sectional view illustrating a state before a movable housing of the unlocking key protrudes. 
         FIG.  23    is a sectional view taken along line VII-VII of  FIG.  21   . 
         FIG.  24    is a top plan view illustrating a state in which the latch key is narrowed by moving a movable member from the state of  FIG.  21   . 
         FIG.  25    is a perspective view illustrating a state in which a manipulation part, the pattern key, and the latch key illustrated in  FIG.  19    are coupled to each other. 
         FIG.  26    is a top plan view of  FIG.  25   . 
         FIG.  27    is a top plan view illustrating a state in which the latch key is narrowed by moving the movable member in  FIG.  26   . 
         FIG.  28    is a bottom view illustrating a state before the unlocking key is coupled to the key recess of the blocking module. 
         FIG.  29    is a bottom view illustrating a state in which the unlocking key is inserted into the key recess of the blocking module. 
         FIG.  30    is a bottom view illustrating a state in which the latch key is opened from the state of  FIG.  29   . 
         FIG.  31    is a bottom view illustrating a state in which the pattern module is moved to the unlocking position by using the unlocking key in the state of  FIG.  30   . 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a port locking apparatus including an unlocking key for a port lock of an electronic device according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. 
     Referring to  FIGS.  1  to  31   , the port locking apparatus includes a port lock  100  (hereinafter, referred to as “a blocking module”) which is inserted into the port  20  of the electronic device  10  and blocks the port  20 , and the unlocking key  200  for a port lock of an electronic device (hereinafter, referred to as “an unlocking key”) which unlocks the blocking module  100  inserted into and coupled to the port  20  such that the blocking module  100  is moved out of the port  20 . 
     The blocking module  100  includes a module frame  110 , a locking module  120  which is fixedly installed inside the module frame  110 , and a pattern module  130  which is movably installed inside the module frame  110  such that the pattern module  130  is movable relatively to the locking module  120 . 
     The module frame  110  has a quadrangular frame shape open at front and rear thereof, and includes a lower wall  111 , an upper wall  112 , and a pair of side walls  113 . The module frame  110  is manufactured in shape and size corresponding to the port  20  of an electronic device to be blocked. A fixing protrusion  114  is formed on each of the side walls  113  by protruding inward therefrom to fix the locking module  120 . 
     The locking module  120  includes a locking module body  121  which is fixedly installed inside the module frame  110 , and a first locking member  123  and a second locking member  125  which are installed movably on the locking module body  121 . 
     The locking module body  121  includes a horizontal part  121   a  located between the upper wall  112  and the lower wall  111  of the module frame  110 , an entrance blocking part  121   b  formed by extending upward from the front end of the horizontal part  121   a , and a guide rib  121   c  formed on each of the opposite edges of the horizontal part  121   a  by protruding downward therefrom. A fixing recess  122  to which the fixing protrusion  114  is fitted and coupled is formed in each of the opposite side surfaces of the horizontal part  121   a . A guide recess  124  is formed in the guide rib  121   c  so as to limit the reciprocating distance of a pattern module  130  and guide the pattern module  130 . 
     The first locking member  123  is connected to the locking module body  121  at an end thereof and can be elastically transformed vertically by external force. An interference protrusion  123   a  is formed on a free end of the first locking member  123  by protruding therefrom such that the interference protrusion  123   a  is in contact with a terminal part  21  installed inside the port  20 . In addition, a guide surface  123   b  is formed to be inclined on the free end of the first locking member  123 . The free end of the first locking member  123  is formed to be inclined downward by protruding toward a lower side, that is, toward the lower surface of the locking module body  121 . Accordingly, when inserting the blocking module  100  into the port  20  of an electronic device, the interference protrusion  123   a  does not interfere with the terminal part  21  of the port  20  (see  FIGS.  8  to  11   ). On the other hand, as illustrated in  FIGS.  12  to  15   , when the pattern module  130  is completely inserted into the module frame  110  and is located at a locking position, the guide surface  123   b  of the free end of the first locking member  123  interferes with the pattern module  130  and the first locking member  123  is transformed such that the first locking member  123  is pressed on the pattern module  130 . In this state, the interference protrusion  123   a  is in close contact with the terminal part  21  of the port  20  to be locked, and thus the blocking module  100  is held so as not to be naturally removed from the port  20 . 
     An end of the second locking member  125  is connected to the locking module body  121 , and a free end thereof extends to protrude to the lower side of the locking module body  121 . The free end of the second locking member  125  is held by a holding jaw  137   a  formed on the pattern module  130 . That is, as illustrated in  FIG.  13   , when the pattern module  130  is completely inserted into the module frame  110  and is located at the locking position, the holding jaw  137   a  of the pattern module  130  is in contact with and held by the free end of the second locking member  125 . Accordingly, the second locking member  125  is pushed by the unlocking key  200  so as to be separated from the holding jaw  137   a  (see  FIG.  16   ). That is, as illustrated in  FIG.  16   , the second locking member  125  is pushed by a pattern key  230  of the unlocking key  200  inserted into a key recess  135  of the pattern module  130  and is unlocked by moving out of the holding jaw  137   a , and in this state, the pattern module  130  may be pulled out to the unlocking position (see  FIG.  9   ). 
     A through hole h 1  in which the first and second locking members  123  and  125  are received is formed vertically through the locking module body  121 . One end of each of the first and second locking members  123  and  125  is connected to the inner wall of the through hole h 1 . 
     The pattern module  130  is coupled in coupling space between the lower wall  111  of the module frame  110  and the locking module  120  such that the pattern module  130  can reciprocate therein. That is, the pattern module  130  can move between the locking position of  FIG.  13    and the unlocking position of  FIG.  9   , and in order to move the pattern module  130  from the locking position to the unlocking position, the unlocking key  200  is required to be used. 
     The pattern module  130  has a pattern module body  131  of a plate shape, and guide protrusions  133  formed by protruding respectively from the opposite side edges of the pattern module body  131 . 
     The key recess  135  into which the pattern key  230  and a latch key  240  of the unlocking key  200  are inserted is formed in the lower surface of the pattern module body  131 . The key recess  135  is exposed to the lower and front surfaces of the pattern module body  131 . A pattern part  135   a  corresponding to the pattern of the pattern key  230 , and a latch key holding recess  135   b  to which the latch key  240  is coupled are formed inside the key recess  135 . The pattern part  135   a  is formed on an inner rear end surface the key recess  135  corresponding to the entrance of the key recess  135 , and the latch key holding recess  135   b  is formed in each of the opposite side surfaces of the key recess  135 . 
     In addition, a first receiving recess  136  is formed in the upper surface of the pattern module body  131  such that the first locking member  123  of the locking module  120  is received in the first receiving recess  136 . The first receiving recess  136  is formed to be deeper gradually toward the front end of the pattern module body  131 , and a first through hole  136   a  communicating with the key recess  135  is formed in an end of the first receiving recess  136 . In addition, a contact press surface  136   b  corresponding to the guide surface  123   b  of the first locking member  123  is slantingly formed in the first receiving recess  136 . 
     In addition, a second receiving recess  137  in which the second locking member  125  is received is formed in the upper surface of the pattern module body  131  by being recessed therefrom. The second receiving recess  137  is formed to be deeper gradually toward a rear end of the pattern module body  131  from the front end thereof, and the holding jaw  137   a  by which the free end of the second locking member  125  is held is formed on an end of the second receiving recess  137 . A second through hole  137   b  is formed in the end of the second receiving recess  137  by extending from the holding jaw  137   a  such that the second through hole  137   b  communicates with the key recess  135 . According to such a configuration, as illustrated in  FIGS.  9  to  11   , when the pattern module  130  is located at the unlocking position, the first locking member  123  is received in the first receiving recess  136 , and the second locking member  125  is not received in the second receiving recess  137 . In this state, when the pattern module  130  is pushed into the module frame  110  and is located at the locking position (see  FIGS.  13  to  15   ), the first locking member  123  interferes with the contact press surface  136   b  and moves out of the first receiving recess  136  to move upward, and thus the interference protrusion  123   a  is in close contact with the terminal part  21  of the port  20 . Additionally, the free end of the second locking member  125  is held by the holding jaw  137   a  of the second receiving recess  137  and protrudes to the key recess  135  through the second through hole  137   b.    
     The unlocking key  200  includes a main body casing  210 , a movable housing  220  installed to protrude from the front of the main body casing  210 , the pattern key  230  which protrudes from the front end of the movable housing  220 , the latch key  240  disposed at the opposite sides of the pattern key  230 , and a manipulation part  250  for manipulating the movement of the movable housing  220  and the latch key  240 . 
     The main body casing  210  includes a lower casing  211  and an upper casing  213  which are coupled to each other. A fixing slit  211   a  is formed in the bottom of the inside of the lower casing  211 . A guide member  212  is coupled to the fixing slit  211   a . A stopper recess  212   a  is formed in the upper surface of the guide member  212 . A guide slit  213   a  is formed in the upper casing  213  such that a main manipulation knob  253  of the manipulation part  250  is coupled to the guide slit  213   a  such that the main manipulation knob  253  can reciprocate. A through hole  214  is formed in the front end of the main body casing  210  such that the movable housing  220  can move in and out of the main body casing  210  through the through hole  214 . 
     The movable housing  220  is installed in the main body casing  210  to move in and out of the main body casing  210  through the through hole  214  of the front end of the main body casing  210 . The movable housing  220  includes a lower housing  221  and an upper housing  223  which are coupled to each other. The lower housing  221  is slidably supported on the guide member  212 . An elastic protrusion  221   a  is formed on the lower housing  221  by protruding downward therefrom, the elastic protrusion being elastically inserted into and coupled to the stopper recess  212   a  of the guide member  212 . Accordingly, when the movable housing  220  in the state of  FIG.  22    is pushed and protruded from the front end of the main body casing  210  as illustrated in  FIG.  23   , the elastic protrusion  221   a  is held in the stopper recess  212   a  such that the position of the movable housing  220  can be fixed. In this state, when the main manipulation knob  253  is further pushed, a movable member  251  to be described later is more moved such that the movement of the latch key  240  can be controlled. 
     The pattern key  230  is fixed to the movable housing  220  by a screw or fixing pin such that the pattern key  230  protrudes from the front end of the movable housing  220 . That is, the pattern key  230  is fixed to the movable housing  220  at a first end thereof by a fastening means such as a bolt, and has a key recess coupling part  231  at a second end thereof, the key recess coupling part having a pattern shape corresponding to the pattern part  135   a  of the key recess  135  of the pattern module  130 . Such a pattern key  230  has a plate shape. 
     The latch key  240  has a latch key body  241  installed inside the movable housing  220 , and latch key parts  243  extending from the latch key body  241 . The latch key body  241  has an approximate “U” shape and includes a pair of elastic parts  241   b  bending and extending from a connection part  241   a  to face each other at opposite sides relative to the connection part  241   a . Each of the latch key parts  243  is formed integrally on an end part of each of the elastic parts  241   b  by bending and extending therefrom. Here, the latch key parts  243  extend by bending orthogonally to the elastic parts  241   b , respectively, and are preferably disposed at the opposite sides of the pattern key  230  by extending with the same heights and thicknesses. In addition, a holding jaw  243   b  is formed on the inner side of the latch key part  243 , the holding jaw  243   b  being held by an end portion of the rear end of the pattern key  230 . In addition, an inclined guide surface  243   c  is formed on the outer edge of the latch key part  243 . When the elastic parts  241   b  are pressed by external forces from opposite sides, the elastic parts  241   b  are elastically transformed and the one pair of latch key parts  243  approach each other to be in close contact with the pattern key  230 . The latch key part  243  has a plate shape, and a holding protrusion  243   a  is formed on an end of the latch key part  243  by protruding laterally therefrom such that the holding protrusion  243   a  is held in the latch key holding recess  135   b  inside the key recess  135 . In addition, opening interference parts  243   d  are formed respectively on rear ends of the latch key parts  243 , the opening interference parts  243   d  being configured to interfere with a holding protrusion  258   b  to be described later and be opened during the rearward movement of the movable member  251  to be described later. The movement of the latch key  240  having such a configuration is controlled by the operation of the manipulation part  250 . 
     The manipulation part  250  includes the movable member  251  installed inside the movable housing  220  such that the movable member  251  can reciprocate by a predetermined distance, the main manipulation knob  253  connected to the movable member  251 , and a sub manipulation knob  255  connected to the movable member  251 . 
     The movable member  251  is installed inside the movable housing  220  such that the movable member  251  can reciprocate by a predetermined distance. The movable member  251  includes a movable member body  257  to which the main manipulation knob  253  is coupled, and an operation part  258  which extends from the movable member body  257  and operates the latch key  240 . The movable member body  257  includes a first coupling part  257   a  to which the main manipulation knob  253  is coupled, a second coupling part  257   b  to which the sub manipulation knob  255  is rotatably coupled, and an elastic protrusion  257   c  protruding to the outside of the movable member  251 . The first coupling part  257   a  is formed on the upper surface of the movable member body  257 , and the second coupling part  257   b  is formed on the rear end of the movable member body  257  by protruding laterally therefrom. The elastic protrusion  257   c  is formed to protrude to the upper surface of the movable member body  257  and is connected to the movable member body  257  such that the elastic protrusion  257   c  is elastically transformed by external force. The elastic protrusion  257   c  is selectively held by a holding protrusion  223   a  formed on the upper housing  223  of the movable housing  220  such that the movable member  251  is fixed in position when the movable member  251  is moved forward. 
     The operation part  258  has a pair of unlocking interference ribs  258   a  which support the latch key body  241  of the latch key  240  from the outside and interfere with the latch key parts  243  to be closed while moving, and the holding protrusion  258   b  which is disposed between the unlocking interference ribs  258   a  and allows the latch key parts  243  to be opened. The unlocking interference ribs  258   a  are formed respectively on the opposite edges of the operation part  258  by protruding parallel to each other therefrom and support the elastic parts  241   b  of the latch key body  241  from the outside. When the movable member  251  moves forward, the unlocking interference ribs  258   a  interfere with the guide surfaces  243   c  of the latch key parts  243  and close the latch key parts  243  as illustrated in  FIG.  27   . Before the movable member  251  moves forward, the holding protrusion  258   b  is located between the opening interference parts  243   d  of the latch key parts  243  as illustrated in  FIG.  26   , and blocks the closing of the latch key parts  243 . In addition, when the movable member  251  moves forward to the maximum, the latch key parts  243  interfere with the unlocking interference ribs  258   a  by moving out of the holding protrusion  258   b  and are closed as illustrated in  FIG.  27   , and thus can be inserted into the key recess  135 . After the latch key parts  243  are inserted into the key recess  135 , the movable member  251  is moved backward a predetermined distance by manipulating the main manipulation knob  253  or the sub manipulation knob  255 . In this case, the latch key parts  243  are opened by the holding protrusion  258   b  as illustrated in  FIG.  30   , and the holding protrusions  243   a  are held in the latch key holding recess  135   b  inside the key recess  135  as illustrated in  FIG.  30   . 
     The main manipulation knob  253  is exposed to the outer side of the main body casing  210  such that the main manipulation knob  253  is connected to the movable member  251 , and can reciprocate along the guide slit  213   a . The sub manipulation knob  255  is connected rotatably to the second coupling part  257   b  at an end thereof, and can protrude from the side surface of the main body casing  210  through an inclined hole  215  formed in the side surface of the main body casing  210 . Accordingly, when the sub manipulation knob  255  protrudes through the inclined hole  215 , a user can manipulate the holding operation of the latch key  240  by easily manipulating the sub manipulation knob  255  in a narrow environment in which it is difficult to manipulate the main manipulation knob  253 . 
     The operation effect of the unlocking key for a port lock of an electronic device having the above configuration according to the embodiment of the present disclosure will be described in detail. 
     First, the process of blocking the port  20  of the electronic device  10  with the blocking module  100  will be described. As illustrated in  FIGS.  2  and  8   , when the pattern module  130  is located at the unlocking position, the blocking module  100  is inserted into the port  20  of an electronic device. In this case, as illustrated in  FIGS.  9  to  11   , the terminal part  21  is located in space between the locking module  120  and the module frame  110 , and is maintained without interference therewith. That is, the first locking member  123  is separated from the terminal part  21 . 
     In this state, the pattern module  130  protruding to the front end of the module frame  110  is pushed to the inside of the module frame  110 . In this case, as illustrated in  FIGS.  13  to  15   , the pattern module  130  interferes with the first locking member  123  while moving to the locking position such that the first locking member  123  moves to the terminal part  21 , and thus the interference protrusion  123   a  is in close contact with the terminal part  21  and holds the blocking module  100  such that the blocking module  100  is not freely removed. In addition, the end of the second locking member  125  is held by the holding jaw  137   a  of the pattern module  130 . In this case, the pattern module  130  is blocked from moving to an initial unlocking position and thus the blocking module  100  can be securely inserted into and fixed in the port  20 , and the blocking module  100  cannot be taken out arbitrarily. 
     Meanwhile, as described above, in order to take out the blocking module  100  which is coupled to the port  20  and blocks the port  20 , the unlocking key  200  may be used. 
     That is, when the main manipulation knob  253  in the state of  FIG.  22    is pushed, the movable housing  220  protrudes from the front end of the main body casing  210  as illustrated in  FIG.  23   . In this state, when the main manipulation knob  253  is further pushed forward, the movable member  251  is moved and the latch key  240  is closed to be in close contact with the opposite sides of the pattern key  230  as illustrated in  FIGS.  24  and  27   . That is, while the movable member  251  is moving forward, the holding protrusion  258   b  moves out of a position between the opening interference parts  243   d  of the latch key parts  243 , and the front ends of the unlocking interference ribs  258   a  of the movable member  251  move forward and interfere with the inclined guide surfaces  243   c  of the latch key parts  243  such that the latch key parts  243  can be forcibly closed. Accordingly, when the latch key parts  243  are closed, a distance between the latch key parts  243  is maintained as a distance corresponding to the width of the key recess  135  of the blocking module  100  such that the latch key parts  243  can be inserted into the key recess  135 . 
     In the state of  FIG.  24   , the pattern key  230  and the latch key  240  are inserted into the key recess  135  of the blocking module  100 . In this case, as illustrated in  FIGS.  9  and  29   , the pattern key  230  is inserted into the key recess  135 , and when the pattern of the front end of the pattern key  230  and the pattern part  135   a  of the key recess  135  match each other, the pattern key  230  can be completely inserted into the key recess  135 . 
     When the pattern key  230  is completely inserted, as illustrated in  FIG.  9   , the pattern key  230  pushes the second locking member  125  to be removed from the holding jaw  137   a.    
     In this state, the movable member  251  is moved backward by a predetermined distance by pushing the main manipulation knob  253  or the sub manipulation knob  255  of the unlocking key  200 . In this case, while the movable member  251  moves backward, the latch key  240  is opened as illustrated in  FIGS.  21  and  26   . In this case, as illustrated in  FIG.  30   , the holding protrusion  243   a  is held in the latch key holding recess  135   b  inside the key recess  135 . 
     In this case, when the unlocking key  200  in the state of  FIG.  30    is pulled, the pattern module  130  is pulled out a predetermined distance and is moved to the unlocking position as illustrated in  FIG.  31   . In this case, as illustrated in  FIGS.  9  and  10   , the first locking member  123  is elastically restored to an initial position thereof, and the interference protrusion  123   a  is removed from the terminal part  21  of the port  20  and is unlocked. In this case, when the unlocking key  200  is further pulled, the blocking module  100  can be naturally removed from the port  20 . 
     As described above, the blocking module  100  can be inserted into the port  20  to lock the port  20  such that the port  20  can be securely blocked. 
     In addition, in order to unlock the port  20 , only the unlocking key  200  having the pattern key  230  having a pattern corresponding to the pattern part  135   a  inside the key recess  135  of the pattern module  130  is required to be used so as to remove the blocking module  100 , thereby further improving security. 
     Particularly, the pattern key  230  and the latch key  240  operate individually, and the function of the latch key  240  is influenced by the shape of the pattern of the pattern key  230 , and thus the blocking module  100  cannot be removed from the port  20  by unauthorized unlocking key  200 . In addition, it is possible to fundamentally prevent the forcible removal of the blocking module  100  from the port  20  by using an unauthorized tool such as a clip or tweezers, thereby improving security. 
     In the above, the present disclosure has been illustrated and described in relation to the exemplary embodiment for illustrating the principle of the present disclosure, but the present disclosure is not limited to the configuration and operation as shown and described as such. Rather, it will be appreciated by those skilled in the art that many changes and modifications to the present disclosure are possible without departing from the spirit and scope of the appended claims.