Patent Publication Number: US-11047154-B2

Title: Locking device for containers

Description:
TECHNICAL FIELD 
     The present disclosure relates to a locking device for containers. 
     BACKGROUND 
     In general, a container includes four corner beams as supports and panels each having a predetermined area as six surfaces, i.e., front, rear, left, right, top, and bottom surfaces, between the supports and interlocked and assembled by welding or using a fastening means such as rivet to form a space therein for transport or storage of freight. 
     In a container, a corner fitting is positioned at each corner. The corner fitting is used to fasten a container to a container transport device when the container is moved to a predetermined position and also used to fix containers positioned adjacent to each other. 
     Further, when stored or transported on a ship or the like, multiple containers are stacked and loaded in multiple stages in a vertical direction. In this case, the containers stacked in a vertical direction are fixed using a container locking device at each corner fitting, so that the containers cannot fall down by swings of the ship or external shocks. 
     As for a conventional container locking device, a main body is positioned between container corner fittings and upper and lower fastening units connected to the main body are inserted and fixed to a lower corner fitting of an upper end container and an upper corner fitting of a lower end container, respectively, to connect and fix the upper end container and the lower end container. 
     Therefore, if the conventional container locking device is used when multiple containers are stacked vertically to be stored or transported on a ship or truck, the main body of the locking device is positioned between the containers and thus unnecessarily requires a space. 
     Further, as for foldable containers used for improving the efficiency in transport and storage of empty containers without freight, multiple folded containers are grouped in a bundle in order not to make an unnecessary space when transported and stored. 
     Furthermore, when multiple containers are stacked using the conventional container locking device, it is difficult to visually check whether or not the container locking device is properly fastened, and, thus, there is a risk of safety accident. 
     Moreover, as for the conventional container locking device, a fastening fixing device can be released even by a small shock during storage and transport, and, thus, special attention thereto is required when containers are transported and stored. 
     In this regard, Korean Patent Laid-open Publication No. 10-2010-0090715 (entitled “Container connector”) discloses a case positioned between containers, a shaft rotatably inserted through the case, an upper cone provided on an upper end of the shaft and inserted into a lower corner casting of an upper end container, a lower cone provided on a lower end of the shaft and inserted into an upper corner casting of a lower end container, a shaft rotation operating means configured to rotate the shaft in a first rotation direction by manual operation, a return spring configured to return the shaft, and a shaft rotation stopping means configured to stop the shaft at a predetermined rotational position by manual operation. 
     DISCLOSURE OF THE INVENTION 
     Problems to be Solved by the Invention 
     The present disclosure is conceived to solve the above-described problem of the conventional technology and provides a locking device for containers which is excellent in space utilization when containers are stacked, maintains a fastening state even under external shock, and makes it possible to visually check the fastening state from the outside. 
     Means for Solving the Problems 
     As a means for solving the above-described technical problem, a locking device for containers according to an aspect of the present disclosure includes: a housing including a base part, a protrusion protruded upwards from an upper surface of the base part, and a through hole formed by penetrating the base part and the protrusion in a vertical direction; a connection part rotatably inserted into the through hole of the housing; an upper cone positioned on the connection part and inserted into a lower corner fitting of a first container positioned on an upper end; and a lower cone positioned under the connection part and inserted into an upper corner fitting of a second container positioned on a lower end. 
     Effects of the Invention 
     According to the aspects of the present disclosure, a locking device for containers is fully inserted and fixed to a hole formed in a corner fitting of a container, and, thus, a space is not formed by the locking device between the container and a container vertically adjacent thereto. Therefore, it is possible to maximize space utilization. 
     Further, a user can more stably maintain a fastening state of containers even under shock applied to the containers and a locking device for containers by using a fastening fixing unit and can also visually check the fastening state of containers at long range. Therefore, it is possible to suppress safety accidents in advance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a container. 
         FIG. 2  is a diagram provided to explain a container locking device to be used for a collapsible container in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 3  is an enlarged view of area A in  FIG. 2 . 
         FIG. 4  is a perspective view of a container locking device in accordance with an exemplary embodiment of the present disclosure. 
         FIGS. 5A and 5B  are an exploded perspective view of a container locking device in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 6  is an exemplary view illustrating connection of a container locking device in accordance with an exemplary embodiment of the present disclosure. 
         FIGS. 7A and 7B  provide a front view and a side view of a container locking device in accordance with an exemplary embodiment of the present disclosure. 
         FIGS. 8A and 8B  provide a front view and a side view illustrating a status where a container locking device in accordance with an exemplary embodiment of the present disclosure is inserted into a corner fitting of a container. 
         FIGS. 9A and 9B  are an exemplary view illustrating an operation of a container locking device in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 10  is a perspective view of a fastening fixing unit in accordance with a first exemplary embodiment of the present disclosure. 
         FIG. 11  is an exemplary view illustrating connection of the fastening fixing unit and a container locking device in accordance with the first exemplary embodiment of the present disclosure. 
         FIGS. 12A and 12B  are an exemplary view illustrating an operation of the fastening fixing unit in accordance with the first exemplary embodiment of the present disclosure. 
         FIGS. 13A and 13B  are diagrams provided to restrict the size of the fastening fixing unit in accordance with the first exemplary embodiment of the present disclosure. 
         FIG. 14  is a perspective view of a fastening fixing unit in accordance with a second exemplary embodiment of the present disclosure. 
         FIG. 15  is an exemplary view illustrating connection of the fastening fixing unit and a container locking device in accordance with the second exemplary embodiment of the present disclosure. 
         FIG. 16  is a perspective view of a fastening fixing unit in accordance with a third exemplary embodiment of the present disclosure. 
         FIG. 17  is an exemplary view illustrating connection of the fastening fixing unit and a container locking device in accordance with the third exemplary embodiment of the present disclosure. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that the present disclosure may be readily implemented by those skilled in the art. However, it is to be noted that the present disclosure is not limited to the embodiments but can be embodied in various other ways. In drawings, parts irrelevant to the description are omitted for the simplicity of explanation, and like reference numerals denote like parts through the whole document. 
     Through the whole document, the term “connected to” or “coupled to” that is used to designate a connection or coupling of one element to another element includes both a case that an element is “directly connected or coupled to” another element and a case that an element is “electronically connected or coupled to” another element via still another element. 
     Through the whole document, the term “on” that is used to designate a position of one element with respect to another element includes both a case that the one element is adjacent to the another element and a case that any other element exists between these two elements. 
     Further, through the whole document, the term “comprises or includes” and/or “comprising or including” used in the document means that one or more other components, steps, operation and/or existence or addition of elements are not excluded in addition to the described components, steps, operation and/or elements unless context dictates otherwise. Through the whole document, the term “about or approximately” or “substantially” is intended to have meanings close to numerical values or ranges specified with an allowable error and intended to prevent accurate or absolute numerical values disclosed for understanding of the present disclosure from being illegally or unfairly used by any unconscionable third party. Through the whole document, the term “step of” does not mean “step for”. 
     The present disclosure relates to a container locking device  100 . 
       FIG. 1  is a perspective view of a container,  FIG. 2  is a diagram provided to explain a container locking device to be used for a collapsible container in accordance with an exemplary embodiment of the present disclosure,  FIG. 3  is an enlarged view of area A in  FIG. 2 ,  FIG. 4  is a perspective view of a container locking device in accordance with an exemplary embodiment of the present disclosure,  FIGS. 5A and 5B  are an exploded perspective view of a container locking device in accordance with an exemplary embodiment of the present disclosure,  FIG. 6  is an exemplary view illustrating connection of a container locking device in accordance with an exemplary embodiment of the present disclosure,  FIGS. 7A and 7B  provide a front view and a side view of a container locking device in accordance with an exemplary embodiment of the present disclosure,  FIGS. 8A and 8B  provide a front view and a side view illustrating a status where a container locking device in accordance with an exemplary embodiment of the present disclosure is inserted into a corner fitting of a container,  FIGS. 9A and 9B  are an exemplary view illustrating an operation of a container locking device in accordance with an exemplary embodiment of the present disclosure,  FIG. 10  is a perspective view of a fastening fixing unit in accordance with a first exemplary embodiment of the present disclosure,  FIG. 11  is an exemplary view illustrating connection of the fastening fixing unit and a container locking device in accordance with the first exemplary embodiment of the present disclosure,  FIGS. 12A and 12B  are an exemplary view illustrating an operation of the fastening fixing unit in accordance with the first exemplary embodiment of the present disclosure,  FIGS. 13A and 13B  are diagrams provided to restrict the size of the fastening fixing unit in accordance with the first exemplary embodiment of the present disclosure,  FIG. 14  is a perspective view of a fastening fixing unit in accordance with a second exemplary embodiment of the present disclosure,  FIG. 15  is an exemplary view illustrating connection of the fastening fixing unit and a container locking device in accordance with the second exemplary embodiment of the present disclosure,  FIG. 16  is a perspective view of a fastening fixing unit in accordance with a third exemplary embodiment of the present disclosure, and  FIG. 17  is an exemplary view illustrating connection of the fastening fixing unit and a container locking device in accordance with the third exemplary embodiment of the present disclosure. 
     Prior to a container locking device  100  of the present disclosure, a container  300  will be described with reference to  FIG. 1 . 
     The container  300  is manufactured to have a cubic shape, and includes a lower panel  301 , an upper panel  302  provided in parallel with the lower panel  301  lateral panels  303  connected to the upper panel  302  and the lower panel  301  along a longitudinal direction of the upper panel  302  and the lower panel  301 , and a front panel  304  and a rear panel  305  connected to the upper panel  302  and the lower panel  301  along a transverse direction thereof. Further, the container  300  includes corner fittings  306  and  307  at its corners, respectively. 
     The corner fittings  306  and  307  include upper corner fittings  306  positioned at the respective corners of the upper panel  302  and lower corner fittings  307  positioned at the respective corners of the lower panel  301 . 
     If the containers  300  are stored or transported as stacked, a device for connecting the container  300  and the container  300  and fixing them not to fall down by external vibrations or shocks is needed. 
     Referring to  FIG. 2  and  FIG. 3 , the container locking device  100  of the present disclosure may be inserted into a lower corner fitting  312  of a first container  310  positioned on an upper end (hereinafter, referred to as “first container  310 ”) and an upper corner fitting  321  of a second container  320  positioned on a lower end (hereinafter, referred to as “second container  320 ”), and, thus, the first container  310  and the second container  320  can be fastened to each other. In other words, each container locking device  100  of the present disclosure may be positioned between four lower corner fittings  312  respectively positioned at corners of a lower panel of the first container  310  and four upper corner fittings  321  respectively positioned at corners of an upper panel of the second container  320 , and, thus, the first container  310  and the second container  320  can be fastened to each other. That is, the first container  310  and the second container  320  can be connected to each other by four container locking devices  100 . 
     Further, if multiple collapsible containers are stacked as folded and then transported and stored in a bundle as illustrated in  FIG. 2 , the container locking device  100  of the present disclosure may connect the folded collapsible containers to each other. 
     For example, an upper part of the container locking device  100  of the present disclosure may be inserted into the lower corner fitting  312  of the first container  310  and a lower part thereof may be inserted into the upper corner fitting  321  of the second container  320 , and, thus, the first container  310  and the second container  320  can be connected to each other. 
     Further, the present container locking device  100  may connect multiple collapsible containers stacked as folded to make a bundle. For example, the present container locking device  100  may connect folded collapsible containers to each other to make the total height of multiple collapsible containers connected as folded similar to the height of an unfolded container. 
     Furthermore, the present container locking device  100  may further include a fastening fixing unit  150  to suppress unfastening caused by rotation of an upper cone  130  and a lower cone  140  of the container locking device  100 . Details thereof will be described latera. 
     Hereinafter, the container locking device  100  according to an exemplary embodiment of the present disclosure (hereinafter, referred to as “present container locking device  100 ”) will be described in detail with reference to  FIG. 4  to  FIG. 8 . 
     Referring to  FIG. 4  to  FIG. 5B , the present container locking device  100  includes: a housing  110  including a base part  111  having a plate shape, a protrusion  112  protruded upwards from an upper surface of the base part  111 , and a through hole  113  formed by penetrating the base part  111  and the protrusion  112  in a vertical direction; a connection part  120  rotatably inserted into the through hole  113  of the housing  110 ; the upper cone  130  positioned on the connection part  120  and inserted into a lower corner fitting  312  of the first container  310 ; and the lower cone  140  positioned under the connection part  120  and inserted into an upper corner fitting  321  of the second container  320 . 
     Referring to  FIG. 6 , connection holes  1312  and  1321  are bored in an upper surface of the upper corner fitting  321  of the second container  320  and a lower surface of the lower corner fitting  312  of the first container  310 , respectively, so that the present container locking device  100  can be inserted thereto. 
     In other words, the upper cone  130  and the protrusion  112  of the present container locking device  100  may be inserted into the connection hole  1312  of the lower corner fitting  312  of the first container  310  and the lower cone  140  may be inserted into the connection hole  1321  of the upper corner fitting  321  of the second container  320 . Further, the base part  111  may be inserted into the upper corner fitting  321  of the second container  320  and extended to the inside of the lower corner fitting  312  of the first container  310 . 
     More specifically, referring to  FIG. 6 , the upper corner fitting  321  of the second container  320  may be positioned under the present container locking device  100  and the lower corner fitting  312  of the first container  310  may be positioned on the present container locking device  100 . 
     Further, the upper corner fitting  321  may have a predetermined space therein and include the connection hole  1321  bored in the upper surface formed in parallel with the upper panel  302 , a front hole  2321  bored in a front surface formed in parallel with the front panel  304  and the rear panel  305 , and a lateral hole  3321  bored in a lateral surface formed in parallel with the lateral panels  303 . 
     Furthermore, the lower corner fitting  312  may have a predetermined space therein and include the connection hole  1312  bored in the lower surface formed in parallel with the lower panel  301 , a front hole  2312  bored in a front surface formed in parallel with the front panel  304  and the rear panel  305 , and a lateral hole  3312  bored in a lateral surface formed in parallel with the lateral panels  303 . 
     The connection hole  1321  formed in the upper surface of the upper corner fitting  321  may be formed to have a greater width in a longitudinal direction than a width in a transverse direction. Further, a width of the lower cone  140  in a longitudinal direction may be smaller than the width of the connection hole  1321  in the longitudinal direction and greater than the width of the connection hole  1321  in the transverse direction. Therefore, the lower cone  140  may be inserted into the space within the upper corner fitting  321  through the connection hole  1321  and rotated to be fastened to the upper corner fitting  321 . 
     Further, the lower cone  140  may be formed to be gradually narrowed toward the bottom thereof and thus can be easily inserted into the connection hole  1321  of the upper corner fitting  321 . 
     The connection hole  1312  formed in the lower surface of the lower corner fitting  312  may be formed to have a greater width in a longitudinal direction than a width in a transverse direction. Further, a width of the upper cone  130  in a longitudinal direction may be smaller than the width of the connection hole  1312  in the longitudinal direction and greater than the width of the connection hole  1312  in the transverse direction. Therefore, the upper cone  130  may be inserted into the space within the lower corner fitting  312  through the connection hole  1312  and rotated to be fastened to the lower corner fitting  312 . 
     Further, the upper cone  130  may be formed to be gradually narrowed toward the top thereof and thus can be easily inserted into the connection hole  1312  of the lower corner fitting  312 . 
     The above-described “longitudinal direction” may refer to the 2 o&#39;clock and 8 o&#39;clock directions in  FIG. 6 , and the above-described “transverse direction” may refer to the 4 o&#39;clock and 10 o&#39;clock directions in  FIG. 6 . 
     Referring to  FIGS. 8A and 8B , an upper portion of the base part  111  is inserted into the connection hole  1312  of the lower corner fitting  312  of the first container  310 , and a lower portion of the base part  111  is inserted and fixed to the connection hole  1321  of the upper corner fitting  321  of the second container  320 . 
     In other words, if the first container  310  is stacked on the second container  320 , the base part  111  can be fully inserted into the connection holes  1312  and  1321  of the corner fittings  312  and  321 . Therefore, the upper surface of the upper corner fitting  321  of the second container  320  can be brought into close contact with the lower surface of the lower corner fitting  312  of the first container  310  and the containers can be fastened to each other without an empty space, and, thus, it is possible to maximize space utilization. 
     Further, since the base part  111  is inserted into the connection hole  1312  of the lower corner fitting  312  of the first container  310  and the connection hole  1321  of the upper corner fitting  321  of the second container  320 , it is possible to suppress forward and backward and left and right movements of the containers and thus possible to securely fasten the containers. 
     Referring to  FIG. 4  to  FIG. 5B , the upper cone  130  may include an upper protrusion  131  protruded upwards on its end, and the lower cone  140  may include a lower protrusion  141  protruded downwards on its end. 
     For example, the upper protrusion  131  may have a cylindrical shape with a flat upper surface, and the lower protrusion  141  may have a cylindrical shape with a flat lower surface. 
     When the lower cone  140  is inserted into the upper corner fitting  321  of the second container  320 , the lower protrusion  141  may be brought into contact with an internal lower surface of the upper corner fitting  321  of the second container  320  and thus may support the container locking device to stably stand upright and may support the upper portion of the base part  111  to be partially protruded toward an upper portion of the upper corner fitting  321 . 
     When the upper cone  130  is inserted into the lower corner fitting  312  of the first container  310 , the upper protrusion  131  may be brought into contact with an internal upper surface of the lower corner fitting  312  of the first container  310  and thus may suppress inclination of the containers or deviation of the container locking device  100  from a predetermined position by vibrations or shocks even when the containers are not fastened by the container locking device  100 . 
     Referring to  FIGS. 7A and 7B , an upper edge and a lower edge of the base part  111  may be chamfered along the circumference. Therefore, the base part  111  can be easily inserted into the connection hole  1312  of the lower corner fitting  312  and the connection hole  1321  of the upper corner fitting  321 . 
     Referring to  FIG. 4  to  FIG. 5B , the present container locking device  100  may include a rotation locked part  121  positioned on a circumferential surface of the connection part  120  and a rotation locking groove  114  to which the rotation locked part  121  is inserted and which is formed on a circumferential surface of the protrusion  112 . 
     Referring to  FIGS. 7A and 7B , the rotation locked part  121  may penetrate the rotation locking groove  114  to be connected to the connection part  120 , and the rotation locking groove  114  may be positioned on a flat surface perpendicular to a rotation axis of the connection part  120  along the circumferential surface of the protrusion  112  and may be formed at an angle of 90 degrees. 
     Therefore, the connection part  120  can be rotated to the left and right by 90 degrees around the rotation axis, and as the connection part  120  is rotated, the upper cone  130  and the lower cone  140  can be rotated. 
     In other words, referring to  FIGS. 8A and 8B , in a state where the upper cone  130  is inserted into the connection hole  1312  of the lower corner fitting  312  of the first container  310  and the lower cone  140  is inserted into the connection hole  1321  of the upper corner fitting  321  of the second container  320 , the connection part  120  can be rotated between a locking position at which the cones cannot be separated from the connection holes  1312  and  1321  and a release position at which the cones can be separated from the connection holes  1312  and  1321 . 
     For example, as illustrated in  FIGS. 9A and 9B , in order to rotate the upper cone  130  and the lower cone  140  from the release position to the locking position, a user may insert a rod-shaped tool through the front holes  2312  and  2321  to push one end of the upper cone  130  or lower cone  140  and thus rotate the upper cone  130  and the lower cone  140 . 
     Further, in order to rotate the upper cone  130  and the lower cone  140  from the locking position to the release position, the user may insert the rod-shaped tool through the lateral holes  3312  and  3321  to push one end of the upper cone  130  or lower cone  140  and thus rotate the upper cone  130  and the lower cone  140 . 
     The fastening fixing unit  150  in accordance with a first exemplary embodiment of the present disclosure will be described with reference to  FIG. 10 . 
     After the present container locking device  100  is fastened to the upper corner fitting  321  of the second container  320  and the lower corner fitting  312  of the first container  310 , the fastening fixing unit  150  may be inserted and fixed to the front hole  2312  or  2321  of the upper corner fitting  321  or the lower corner fitting  312  to fix the upper cone  130  or the lower cone  140  not to be rotated. 
     The fastening fixing unit  150  may include a front plate  151  having a rectangular shape, a first inclined plate  152  and a second inclined plate  153  respectively extended from both ends of the front plate  151  and bent inwards, a first rear plate  154  extended from the first inclined plate  152  and bent inwards in parallel with the front plate  151 , a second rear plate  155  extended from the second inclined plate  153  and bent inwards in parallel with the front plate  151 , and a bending fixing part  157  positioned on an outer surface of each of the first rear plate  154  and the second rear plate  155  and bent into a “¬” shape. 
     The above-described “inwards” may refer to a direction in which an inner surface of the fastening fixing unit  150  is positioned. 
     The fastening fixing unit  150  may be formed to be gradually decreased in width from the rear plates  154  and  155  toward the front plate  151 , and may have, for example, a trapezoidal shape. 
     Referring to  FIGS. 13A and 13B , a distance L from the front plate  151  to the rear plates  154  and  155  may satisfy the following Equation 1.
 
 B&lt;L≤A   [Equation 1]
         L: Distance from the front plate to the rear plates   A: Distance from the upper cone or lower cone rotated to the locking position to an inner surface of a front portion of the upper corner fitting or lower corner fitting   B: Distance from the upper cone or lower cone rotated to the release position to the inner surface of the front portion of the upper corner fitting or lower corner fitting       

     Accordingly, if the fastening fixing unit  150  is fixed to the front hole  2312  or  2321  of the upper corner fitting  321  or the lower corner fitting  312 , the front plate  151  may be brought into contact with one surface of the upper cone  130  or lower cone  140  and the rear plates  154  and  155  may be brought into an inner surface of the upper corner fitting  321  or lower corner fitting  312  to fix the upper cone  130  and the lower cone  140  not to be rotated. 
     The fastening fixing unit  150  may be formed of a material having a predetermined elasticity and thus may be deformed by force applied to a grip part  156 , which will be described later, and inserted into the front hole  2312  or  2321  of the upper corner fitting  321  or the lower corner fitting  312  and then may be returned to its original form by removing the force and fixed to the front hole  2312  or  2321 . 
     Referring to  FIG. 11 , the fastening fixing unit  150  may be fixed to the front hole  2312  of the lower corner fitting  312 . 
     In other words, the fastening fixing unit  150  may be inserted through the front hole  2312  of the lower corner fitting  312  of the first container and then deformed into a “⊏” shape by the first rear plate  154  and the bending fixing part  157  or the second rear plate  155  and the bending fixing part  157  and the “⊏”-shaped fastening fixing unit  150  may be fixed to the front hole  2312  of the lower corner fitting  312 , but is not limited thereto. The fastening fixing unit  150  may be fixed to the front hole  2321  of the upper corner fitting  321  of the second container. 
     Referring to  FIGS. 13A and 13B , a distance M from one end of the bending fixing part  157  to a bent portion of the bending fixing part  157  may satisfy the following Equation 2.
 
 C≤M &lt;( C+D )  [Equation 2]
         M: Distance from one end of the bending fixing part to the bent portion of the bending fixing part   C: Thickness of the front hole of the upper corner fitting or lower corner fitting   D: Difference in distance from the upper cone or lower cone rotated to the locking position and the upper cone or lower cone rotated to the release position to the inner surface of the front portion of the upper corner fitting or lower corner fitting       

     Accordingly, the fastening fixing unit  150  can be securely fixed to the front hole  2312  of the lower corner fitting  312  of the first container. 
     Referring to  FIGS. 12A and 12B , the first rear plate  154  and the second rear plate  155  may include the grip part  156  of which ends are bent outwards. 
     The above-described “outwards” may refer to refer to a direction in which an outer surface of the fastening fixing unit  150  is positioned. 
     Further, when the user applies force to the grip part  156  inwards, the first inclined plate  152  and the second inclined plate  153  are contracted inwards around the portions in contact with the front plate  151 , and, thus, the fastening fixing unit  150  can be easily inserted into the front holes  2312  and  2321  of the corner fittings  312  and  321 . 
     The fastening fixing unit  150  in accordance with a second exemplary embodiment of the present disclosure will be described with reference to  FIG. 14  and  FIG. 15 . 
     The fastening fixing unit  150  in accordance with the second exemplary embodiment of the present disclosure may further include a cone mounting part  159  which is connected to the front plate  151 , formed into a “⊏” shape, and inserted into the upper protrusion  131  of the upper cone  130  and of which a lower surface is brought into contact with an upper portion of the upper cone  130 . 
     If the fastening fixing unit  150  in accordance with the second exemplary embodiment of the present disclosure is fixed to the front hole  2321  of the upper corner fitting  321 , the cone mounting unit  159  may be inserted into the upper protrusion  131  and the lower surface of the cone mounting unit  159  may be brought in contact with the upper portion of the upper cone  130 , and, thus, the fastening fixing unit  150  can be fixed without being sagged downwards by gravity. 
     The fastening fixing unit  150  in accordance with a third exemplary embodiment of the present disclosure will be described with reference to  FIG. 16  and  FIG. 17 . 
     After the present container locking device  100  is fastened to the upper corner fitting  321  of the second container  320  and the lower corner fitting  312  of the first container  310 , the fastening fixing unit  150  in accordance with the third exemplary embodiment of the present disclosure may be inserted and fixed to the lateral hole  3312  or  3321  of the upper corner fitting  321  or the lower corner fitting  312  to fix the upper cone  130  or the lower cone  140  not to be rotated. 
     To this end, the fastening fixing unit  150  in accordance with the third exemplary embodiment of the present disclosure may further include a cone insertion part  158  which is connected to the front plate  151  and formed into a “⊏” shape and to which the upper cone  130  or lower cone  140  is inserted. 
     In other words, if the fastening fixing unit  150  in accordance with the third exemplary embodiment of the present disclosure is fixed to the lateral hole  3312  or  3321  of the upper corner fitting  321  or the lower corner fitting  312 , the upper cone  130  positioned under the upper protrusion  131  or the lower cone  140  positioned on the lower protrusion  141  may be inserted into the cone insertion part  158  to fix the upper cone  130  and the lower cone  140  not to be rotated. 
     An outer circumferential surface of the fastening fixing unit  150  may be painted in a different color from a container. 
     Therefore, if multiple containers are stacked, it is possible to easily distinguish a part which is fastened by the present container locking device  100  and the other part which is not fastened by the present container locking device  100 . 
     For example, a container may be entirely painted orange and the fastening fixing unit  150  may be painted blue. As such, the container and the fastening fixing unit  150  may be painted in complementary colors. 
     Accordingly, when the fastening fixing unit  150  is inserted and fixed to the corner fitting of the container, the fastening fixing unit  150  can be more distinctly and clearly seen against the color of the container. 
     The above description of the present disclosure is provided for the purpose of illustration, and it would be understood by those skilled in the art that various changes and modifications may be made without changing technical conception and essential features of the present disclosure. Thus, it is clear that the above-described embodiments are illustrative in all aspects and do not limit the present disclosure. For example, each component described to be of a single type can be implemented in a distributed manner. Likewise, components described to be distributed can be implemented in a combined manner. 
     The scope of the present disclosure is defined by the following claims rather than by the detailed description of the embodiment. It shall be understood that all modifications and embodiments conceived from the meaning and scope of the claims and their equivalents are included in the scope of the present disclosure. 
     EXPLANATION OF REFERENCE NUMERALS 
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                  100: Container locking device 
                   
               
               
                   
                  110: Housing 
               
               
                   
                  111: Base part 
                  112: Protrusion 
               
               
                   
                  113: Through hole 
                  114: Rotation locking groove 
               
               
                   
                  120: Connection part 
                  121: Rotation locked part 
               
               
                   
                  130: Upper cone 
                  131: Upper protrusion 
               
               
                   
                  140: Lower cone 
                  141: Lower protrusion 
               
               
                   
                  150: Fastening fixing unit 
               
               
                   
                  151: Front plate 
                  152: First inclined plate 
               
               
                   
                  153: Second inclined plate 
                  154: First rear plate 
               
               
                   
                  155: Second rear plate 
                  156: Grip part 
               
               
                   
                  157: Bending fixing part 
                  158: Cone insertion part 
               
               
                   
                  159: Cone mounting part 
               
               
                   
                  300: Container 
                  301: Lower panel 
               
               
                   
                  302: Upper panel 
                  303: Lateral panel 
               
               
                   
                  304: Front panel 
                  305: Rear panel 
               
               
                   
                  306: Upper corner fitting 
                  307: Lower corner fitting 
               
               
                   
                  310: First container 
                  311: Upper corner fitting 
               
               
                   
                  312: Lower corner fitting 
                 1312: Connection hole 
               
               
                   
                 2312: Front hole 
                 3312: Lateral hole 
               
               
                   
                  320: Second container 
                  321: Upper corner fitting 
               
               
                   
                 1321: Connection hole 
                 2321: Front hole 
               
               
                   
                 3321: Lateral hole 
                  322: Lower corner fitting