Patent Publication Number: US-9841222-B2

Title: Refrigerator

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. National Phase Application under 35 U.S.C. §371 of International Application PCT/KR2014/005246, filed on Jun. 16, 2014, which claims the benefit of Korean Application Nos. 10-2013-0068235, and 10-2013-0068183 filed on Jun. 14, 2013, the entire contents of which are hereby incorporated by reference in their entireties. 
     TECHNICAL FIELD 
     The present invention relates to a refrigerator and, more particularly, to a refrigerator in which a container may be stably fixed to a cabinet when a door is rotated separately from the container. 
     BACKGROUND ART 
     In general, a refrigerator is an apparatus that stores food and the like refrigerated or frozen as cold air, generated by a refrigeration cycle consisting of a compressor, a condenser, an expansion valve, an evaporator and the like, is circulated to lower an interior temperature of a food storage space. 
     Such a refrigerator generally includes a freezing compartment in which food or beverages are kept frozen and a refrigerating compartment in which food or beverages are kept at a low temperature. 
     Refrigerators may be classified into a top mount type refrigerator in which the freezing compartment is located above the refrigerating compartment, a bottom freezer type refrigerator in which the freezing compartment is located below the refrigerating compartment and a side by side type refrigerator in which the freezing compartment and the refrigerating compartment are left and right compartments divided by a partition. 
     These refrigerators implement cooling of a storage compartment, such as the freezing compartment or the refrigerating compartment, using cold air generated by heat exchange between air and refrigerant circulating through the refrigeration cycle. Accordingly, the interior of the storage compartment defined in the refrigerator is usually kept at a lower temperature than a temperature of the outside. 
     The freezing compartment and the refrigerating compartment are defined in a cabinet that forms an external appearance of the refrigerator and are selectively opened or closed by a freezing compartment door and a refrigerating compartment door respectively. The freezing compartment door and the refrigerating compartment door are pivotally rotatably mounted to the freezing compartment and the refrigerating compartment which have open front sides. Each door is provided with a gasket to hermetically seal the interior of the storage compartment. 
     In recent years, to satisfy various consumer demands and to prevent loss of cold air caused by frequent door opening/closing, technologies in which an auxiliary door is installed between the cabinet and the refrigerating compartment or freezing compartment door and a storage container is installed to the auxiliary door have been developed. 
     However, due to the fact that the freezing compartment or refrigerating compartment door and the auxiliary door are provided with gaskets respectively, loss of cold air through the two gaskets may be increased beyond that in the case in which a single gasket is provided without the auxiliary door. 
     In addition, dew formation due to a temperature difference between the interior and the exterior may occur at gasket contact regions, i.e. at a front surface of the cabinet and a front surface of the freezing compartment or refrigerating compartment door. To prevent this dew formation, it is necessary to mount respective heaters in the aforementioned two regions to heat the regions. In this case, two heaters for prevention of dew formation may be required, which may cause increased power consumption. 
     In addition, since the freezing compartment or refrigerating compartment door may be opened or closed independently of the auxiliary door, there is a need for a structure to stably fix the auxiliary door to the cabinet upon opening or closing of the refrigerating compartment or freezing compartment door. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     The present invention is directed to solving the above-described problems and one object of the present invention is to provide a fixing device which may stably fix a container to a cabinet when a door is rotated separately from the container and a refrigerator having the same. 
     Another object of the present invention is to provide a fixing device which may allow a container to be moved toward a user when a door is rotated alone and a refrigerator having the same. 
     Solution to Problem 
     In accordance with one embodiment of the present invention, there is provided a refrigerator including a cabinet configured to define a first storage region in which food is stored, a door configured to open or close the first storage region, a gasket provided at the door to seal the first storage region, a first hinge located at the outside of a sealing region, the sealing region being defined by the gasket, one side of the first hinge being fixed to the cabinet and the other side of the first hinge being rotatably connected to the door, a container configured to define a second storage region, the container being received in the first storage region, a second hinge located inside the sealing region, one side of the second hinge being fixed to the container and the other side of the second hinge being rotatably connected to the door, a guide unit configured to protrude into the first storage region, and a fixing device provided at the container, the fixing device being selectively coupled to or released from the guide unit, wherein the first hinge and the second hinge respectively include rotating shafts and the rotating shaft of the second hinge is not arranged in an extension line of the rotating shaft of the first hinge such that a coupling portion of the container and the second hinge is drawn forward when the door is rotated independently relative to the container, and wherein the fixing device includes a push unit configured to be pushed by the door and a holder configured to fix the guide unit such that the guide unit becomes a rotation center of the container while the door is rotated and releases the push unit from a pushed state. 
     The holder may be coupled to the push unit so as to be rotatable relative to the push unit. 
     The fixing device may include a first holder configured to surround one side of the guide unit and a second holder configured to surround the other side of the guide unit, and the first holder and the second holder may be pivotally rotatable when the push unit is pushed. 
     The first holder and the second holder may be rotatable to be farther apart from each other. 
     The guide unit may include a guide pin configured to be surrounded by the first holder and the second holder and a pivotally rotatable guide bar configured to come into contact with the second holder so as to be rotated under guidance of the second holder. 
     The fixing device may further include a first stopper configured to selectively limit pivotal rotation of the first holder, and the first stopper may be rotated when the push unit is pushed. 
     The fixing device may further include a second stopper configured to selectively limit pivotal rotation of the second holder, and the second stopper may be rotated when the push unit is pushed. 
     The first stopper and the second stopper may be rotatable to be farther apart from each other. 
     The holder may be provided with a guide piece, the guide piece including two parallel guide walls to guide a movement path of the guide unit. 
     The guide piece may have one open end. 
     The push unit may include a pressure piece configured to come into contact with the door and be selectively pushed by the door and a transfer piece having a receiving bore in which a cam included in the holder is received and operated. 
     The receiving bore may be provided with a seat groove, the cam may be provided with a first protrusion, and rotation of the holder may be limited when the first protrusion is received in the seat groove. 
     The receiving bore may be provided with a stepped seat portion, the cam may be provided with a second protrusion, and rotation of the holder may be limited when the second protrusion is caught by the stepped seat portion. 
     Advantageous Effects of Invention 
     In a refrigerator according to the present invention as described above, since only a single door is provided to open or close a storage compartment, it is possible to reduce loss of cold air caused through use of two gaskets and to reduce power consumption by heaters. This may result in enhanced energy efficiency. 
     In addition, according to the present invention, a container and a door may be operated individually or together, which may facilitate user access to a storage compartment. Moreover, according to the present invention, it is possible to facilitate user access to food received in the container. 
     In addition, according to the present invention, the container may be fixed to a cabinet when the door except for the container is operated alone. This may prevent unintentional rotation of the container. That is, it is possible to prevent the container from being operated contrary to the user&#39;s expectations. 
     In addition, according to the present invention, the container may be moved in a given direction toward a user when a door is operated alone, which may ensure easier user access to the container. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention. 
       In the drawings: 
         FIG. 1  is a view showing a state in which a door closes a storage compartment of a refrigerator according to the present invention; 
         FIG. 2  is a view showing a rotated state of the door in the refrigerator according to the present invention; 
         FIG. 3  is a view showing a rotated state of a container and the door in refrigerator according to the present invention; 
         FIG. 4  is a view showing a fixing device according to one embodiment of the present invention, which is installed to the container; 
         FIG. 5  is a schematic view showing pivotal rotation of the door according to one embodiment of the present invention; 
         FIG. 6  is a view showing one embodiment of portion ‘A’ of  FIG. 3  in detail; 
         FIG. 7  is a view showing the fixing device according to one embodiment; 
         FIG. 8  is a left side view of  FIG. 7 ; 
         FIG. 9  is a right side view of  FIG. 7 ; 
         FIG. 10  is an exploded perspective view of  FIG. 7 ; 
         FIG. 11  is a view showing operation of a guide unit and the fixing device in the state of  FIG. 1  according to one embodiment; 
         FIG. 12  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 2  according to one embodiment; 
         FIG. 13  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 3  according to one embodiment; 
         FIG. 14  is a view showing transition from the state of  FIG. 13  to the state of  FIG. 11  in sequence; 
         FIG. 15  is a view showing a fixing device according to another embodiment of the present invention, which is installed to the container; 
         FIG. 16  is a schematic view showing pivotal rotation of the door according to another embodiment of the present invention; 
         FIG. 17  is a view showing another embodiment of portion ‘A’ of  FIG. 3  in detail; 
         FIG. 18  is a view showing the fixing device according to another embodiment; 
         FIG. 19  is a left side view of  FIG. 18 ; 
         FIG. 20  is a right side view of  FIG. 18 ; 
         FIG. 21  is an exploded perspective view of  FIG. 18 ; 
         FIG. 22  is a view explaining operation of a push unit, a cam and a receiving bore according to another embodiment; 
         FIG. 23  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 1  according to another embodiment; 
         FIG. 24  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 2  according to another embodiment; and 
         FIG. 25  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 3  according to another embodiment. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, preferred embodiments of the present invention to concretely achieve the above-described objects will be described with reference to the accompanying drawings. 
     The size, shape or the like of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms, particularly defined by taking into consideration the configurations and functions of the present invention, may be replaced by other terms based on intensions of users or operators or customs. Hence, the meanings of these terms must follow definitions described in the entire specification. 
       FIG. 1  is a view showing a state in which a door closes a storage compartment of a refrigerator according to the present invention. A description with reference to  FIG. 1  is as follows. 
     A door  20  is installed to a cabinet  10  of the refrigerator. The door  20  may be a door to open a refrigerating compartment or a freezing compartment. 
     The storage compartment may refer to a first storage region in which food is stored. 
     A dispenser  30  may be installed in the door  20  to provide a user with water or ice. The user may acquire water or ice via the dispenser  30  without opening the door  20 . 
     The door  20  is provided with a handle  22  to assist the user in pivotally rotating the door  20  with the hand. As the user who grips the handle  22  pivotally rotates the door  20 , the storage compartment may be opened. 
     The handle  22  may be provided with a button  652  that the user can push. The user may execute various functions, such as door opening of the refrigerator and the like, by pushing the button  652 . In this case, the button  652  may be used to drive a fastening device that will be described hereinafter. 
     A button member housing  654  may be formed at one surface of the handle  22  so as to be connected to the interior of the door  20 . The button member housing  654  may contain a push bar therein to enable transmission of displacement, generated by the button  652 , to the interior of the door  20 . 
       FIG. 2  is a view showing a rotated state of the door in the refrigerator according to the present invention. A description with reference to  FIG. 2  is as follows. 
     Referring to  FIG. 2 , the door  20  is pivotally rotated alone and a container  100  pivotally rotatably coupled to the door  20  is received in the storage compartment  2 . 
     The storage compartment  2  in which food may be stored is defined in the cabinet  10 . The storage compartment  2  may correspond to a refrigerating compartment or a freezing compartment. The user may pivotally rotate the door  20  to open or close the storage compartment  2 . 
     The door  20  is pivotally rotatably coupled to the cabinet  10  via a first hinge  40 . The first hinge  40  is connected to one lateral side of the cabinet  10  and one lateral side of the door  20  to assist the door  20  in being pivotally rotated relative to the cabinet  10 . 
     A gasket  26  is attached to an inner surface of the door  20  so as to selectively come into contact with the cabinet  10 . The gasket  26  is arranged along an outer circumferential surface of the door  20 . As such, the entire gasket  26  may have a rectangular shape conforming to a rectangular shape of the door  20 . Once the door  20  is rotated toward the cabinet  10  to hermetically seal the storage compartment  2 , the gasket  26  comes into contact with the cabinet  10  to hermetically seal the storage compartment  2 . 
     The door  20  may be provided at an inner surface thereof with at least one storage member  24  in which food is stored. More specifically, after opening the door  20  as exemplarily shown in  FIG. 2 , the user can access the storage member  24  to store food in the storage member  24  installed to the inner surface of the door  20  or to retrieve the stored food. 
     The container  100  is pivotally rotatably coupled to the door  20  via a second hinge  200 . The second hinge  200  is rotated about a rotating shaft thereof and the rotating shaft of the second hinge  200  is separate from a rotating shaft of the first hinge  40 . In this case, the rotating shaft of the second hinge  200  is pivotally rotatably coupled to the door  20 . 
     That is, both the first hinge  40  and the second hinge  200  are coupled to the door  20  without a connection structure therebetween. 
     The fastening device  600  includes one or more components installed to the door  20  and one or more components installed to the container  100 . The fastening device  600  may selectively couple the container  100  and the door  20  to each other or release coupling of the container  100  and the door  20 . 
     As one component installed to the container  100 , the fastening device  600  includes a fastener  610 . In addition, as components installed to the door  20 , the fastening device  600  includes a holder  630  configured to be coupled to the fastener  610  and an operator  640  configured to operate the fastener  610  so as to release coupling of the fastener  610  and the holder  630 . 
     The user may select whether to rotate the container  100  and the door  20  together or to rotate the door  20  alone by selectively operating the button  652  formed at the handle  22 . That is, the user may operate the button  652  to rotate the door  20  alone while allowing the container  100  to be received and fixed in the storage compartment  2  as exemplarily shown in  FIG. 2 . 
     Meanwhile, the holder  630  is placed in an inner space defined by the gasket  26 . The gasket  26  may generally have a rectangular shape similar to the profile of the outer circumferential surface of the door  20  and some components of the fastening device  600  may be arranged inside the rectangular gasket  26 . 
     In addition, the holder  630  and the fastener  610  may be arranged in a region of the storage compartment  2  defined inside the gasket  26 . That is, once the door  20  hermetically seals the storage compartment  2 , the fastening device  600  is placed in a space of the storage compartment  2  inside the gasket  26 . As such, the fastening device  600  may be located in the storage compartment  2  into which cold air is supplied. 
     Likewise, the fastener  610  may be placed in the space inside the gasket  26 , i.e. in a region of the storage compartment  2  inside the gasket  26 , although the fastener  610  is installed to the container  100 . 
     Meanwhile, the fastening device  600  may be located at a position opposite to an installation position of the second hinge  200 . More specifically, the container  100  may be rotated relative to the door  20  about the second hinge  200  and the fastening device  600  may be positioned far from a rotation center corresponding to the second hinge  200 . As the fastening device  600  is located far from the second hinge  200  as a rotation center, the fastening device  600  may stably maintain coupling of the container  100  and the door  20  even with relatively low force. 
     Meanwhile, a fixing device  500  is installed to the top of the container  100  to fix the container  100  to the cabinet  10 . 
       FIG. 3  is a view showing a rotated state of the container and the door in refrigerator according to the present invention. A description with reference to  FIG. 3  is as follows. 
     Referring to  FIG. 3 , the door  20  and the container  100  are rotated together to open the storage compartment  2 . 
     The container  100  may be provided with a plurality of storage members  52  to allow the user to store food in the storage members  52  or to retrieve food stored in the storage members  52 . The plural storage members  52  may be installed to the container  100  at different heights. The container  100  may internally define a second storage region in which food is stored. 
     Meanwhile, the user may rotate the container  100  when it is desired to use the storage members  52  installed to the container  100 . As the container  100  is rotated and moved outward of the storage compartment  2 , the user can access the storage members  52 . 
     Even in a state in which the container  100  comes into contact with the door  20 , the gasket  26  does not come into contact with the container  100 . That is, the gasket  26  is installed to the door  20  at a position around an outer circumferential surface of the container  100  and, therefore, interference between the gasket  26  and the container  100  does not occur. 
     Accordingly, even in a state in which the door  20  hermetically seals the storage compartment  2 , there occurs no contact between the container  100  and the gasket  26 . In this case, the gasket  26  may come into contact with the cabinet  10 . 
     More specifically, in a state as exemplarily shown in  FIG. 1 , the door  20  and the cabinet  10  are arranged to face each other with the gasket  26  interposed therebetween and, therefore, the storage compartment  2  may be hermetically sealed from the outside by the gasket  26  and the door  20 . 
     In this way, according to the present invention, only the gasket  26  for the door  20  is provided without a gasket for the container  100 . That is, the storage compartment  2  may be sufficiently hermetically sealed under provision of the single gasket  26  for the door  20 , which may prevent loss of cold air due to installation of several gaskets and waste of power for heating. 
     Meanwhile, a plurality of shelves  4  on which food can be disposed may be installed in the storage compartment  2  at different heights. 
     In addition, a plurality of drawers  6  configured to be introduced or withdrawn in a sliding manner may be accommodated in the storage compartment  2 . The drawers  6  may allow food received therein to remain hermetically sealed at a given degree even if the storage compartment  2  is opened by pivotal rotation of the door  20  or the container  100 . 
     The container  100  is provided with the fixing device  500  to selectively couple the container  100  to the cabinet  10 . The fixing device  500  is configured to be fixed to an inner surface of the cabinet  10 , i.e. to a ceiling surface of the storage compartment  2 . The user may rotate the door  20  alone or rotate the door  20  and the container  100  together according to user convenience. 
     More specifically, when the container  100  is fixed to the cabinet  10  by the fixing device  500 , the door  20  is pivotally rotated alone. On the other hand, when the container  100  is not fixed to the cabinet  10 , the container  100  may be rotated along with the door  20  to open the storage compartment  2 . 
     In  FIG. 3 , although not shown, a guide unit that will be described later with reference to  FIG. 6  or  FIG. 17  is installed inside a circular portion designated by reference letter “A”. The guide unit will be described later in detail with reference to  FIG. 6  or  FIG. 17 . 
       FIG. 4  is a view showing the fixing device according to one embodiment of the present invention, which is installed to the container. In addition, in  FIG. 4 , only the fastener  610  is shown as being separated from the container  100 . A description with reference to  FIG. 4  is as follows. 
     The container  100  includes a body  110  forming an external appearance of the container  100  and a cover  130  coupled to the body  110 . The cover  130  closes an opening of the body  110  to prevent an inner region of the body  110  from being partially exposed outward. 
     Meanwhile, the fastening device  600  may be mounted to the cover  130 . In this case, as components installed to the container  100 , the fastening device  600  may include the fastener  610  and a cover  612  configured to cover the front of the fastener  610 . 
     The fastener  610  and the cover  612  are installed to the container  100  so as to come into contact with the door  20 . 
     The fixing device  500  may be installed to the top of the body  110 . The fixing device  500  may selectively come into contact with an inner ceiling surface of the storage compartment  2  to selectively fix the container  100  to the storage compartment  2 . 
     The second hinge  200  may include a rotating shaft  206  coupled to the door  20 . The rotating shaft  206  is pivotally rotatably fixed to the door  20  to assist the container  100  in being pivotally rotated about the rotating shaft  206 . 
     Meanwhile, a total of two second hinges  200  may be installed at upper and lower positions of the container  100  respectively. The second hinges  200  have the same shape and differ only in terms of installation positions thereof at the container  100  and the door  20 . 
       FIG. 5  is a schematic view showing pivotal rotation of the door according to one embodiment of the present invention. A description with reference to  FIG. 5  is as follows. 
     In  FIG. 5 , (a) shows a state in which the door  20  hermetically seals the storage compartment  2  as exemplarily shown in  FIG. 1  and the door  20  and the container  100  are located adjacent to each other. 
     Although a second hinge exemplarily shown in  FIG. 5  is an alteration of the above-described second hinge, the second hinge of  FIG. 5  may be equal to the above-described second hinge within the scope of the present invention. Thus, the alteration of the above-described second hinge is also referred to as the second hinge. 
     In a state in which the door  20  is located at the front of the container  100 , the container  100  is placed so as to be slightly tilted. More specifically, as exemplarily shown in (a) of  FIG. 5 , it will be appreciated that, on the basis of one surface of the door  20 , the right side of the container  100  may be located farther from the door  20  than the left side of the container  100 . 
     The fixing device  500  is located at the left side of the container  100 . 
     In  FIG. 5 , (b) shows a state in which the door  20  is rotated alone as exemplarily shown in  FIG. 2  and the door  20  and the container  100  are spaced apart from each other. 
     In this case, when the door  20  is rotated alone, the container  100  remains fixed to the cabinet  10  by the fixing device  500 . However, differently from the state as exemplarily shown in (a) of  FIG. 5 , the container  100  is horizontally oriented rather than being tilted and is drawn toward the user by a predetermined distance. 
     That is, once the user rotates the door  20 , the container  100  is moved toward the user and, therefore, the user can easily access the container  100 . 
     This movement of the container  100  is possible because a rotating shaft  42  of the first hinge  40  and the rotating shaft  206  of the second hinge  200  are located at different positions. In other words, centers of the rotating shaft  42  of the first hinge  40  and the rotating shaft  206  of the second hinge  200  are not present in the same line. That is, since the rotating shaft  42  of the first hinge  40  and the rotating shaft  206  of the second hinge  200  are arranged parallel to each other at different positions when viewed from the top, once the door  20  is rotated relative to the cabinet  10 , the container  100  must be rotated under the influence of rotation of the door  20 . This is because the container  100  is pivotally rotatably connected to the door  20  via the second hinge  200  and the rotating shaft  206  of the second hinge  200  is rotated relative to the rotating shaft  42  of the first hinge  40  when the door  20  is rotated. 
     Meanwhile, it will be appreciated that the fixing device  500  is moved downward in the state as exemplarily shown in (b) of  FIG. 5  beyond a position as shown in (a) of  FIG. 5 . The fixing device  500  is installed to the container  100  that is moved upon rotation of the door  20  and, thus, the fixing device  500  is moved simultaneously with rotation of the door  20 . 
     In the state as exemplarily shown in (b) of  FIG. 5 , the fixing device  500  may remain caught by the cabinet  10  and, therefore, the container is not rotated along with the door  20 . This will be described later in detail. 
       FIG. 6  is a view showing one embodiment of portion ‘A’ of  FIG. 3  in detail. A description with reference to  FIG. 6  is as follows. 
     A guide unit  12  is installed to the top of the cabinet  10  to protrude inward of the storage compartment  2 . In this case, the guide unit  12  may protrude downward from the top of the cabinet  10 . 
     The guide unit  12  may include a guide pin  14  in the form of a cylinder. The guide pin  14  is fixed at a predetermined position rather than being movable within the cabinet  10 . 
     The guide pin  14  may have a predetermined thickness and, thus, achieve a given level of strength. Accordingly, as the guide pin  14  comes into contact with the fixing device  500 , the guide pin  14  may be moved by the fixing device  500  or movement of the guide pin  14  may be limited by the fixing device  500 . 
     The guide pin  14  may generally take the form of a cylinder having a circular cross section. Of course, the guide pin  14  may be altered into various other shapes. 
     In addition, the guide unit  12  may include a pivotally rotatable guide bar  15 . The guide bar  15  may be rotated about a rotation center at one side thereof. A spring  16  is provided to return the guide bar  15 , which has been displaced upon receiving external force, to an original position thereof upon removal of the external force. 
     A detent boss  18  is formed at one side of the guide bar  15  to prevent the guide bar  15  from being rotated beyond a specific angle. The detent boss  18  may come into contact with the guide bar  15  or may not come into contact with the guide bar  15  according to a position of the guide bar  15 . 
     The detent boss  18  may have a predetermined thickness to limit rotation of the guide bar  15 . 
     Meanwhile, the guide bar  15  may be spaced apart from the guide pin  14  by a predetermined distance. That is, the guide bar  15  and the guide pin  14  may be arranged so as not to come into contact with each other and serve to guide operation of the fixing device  500 . 
       FIG. 7  is a view showing the fixing device according to one embodiment,  FIG. 8  is a left side view of  FIG. 7 ,  FIG. 9  is a right side view of  FIG. 7  and  FIG. 10  is an exploded perspective view of  FIG. 7 . A description with reference to  FIGS. 7 to 10  is as follows. 
     The fixing device  500  may be selectively coupled to or released from the guide unit  12 . In addition, the fixing device  500  may be installed to the top of the container  100 . This position of the fixing device  500  is determined to ensure contact between the fixing device  500  and the guide unit  12 . 
     The fixing device  500  may include a first holder  510  surrounding one side of the guide unit  12  and a second holder  520  surrounding the other side of the guide unit  12 . More specifically, the first holder  510  may be located to surround one side of the guide pin  14  and the second holder  520  may be located to surround the other side of the guide pin  14 . 
     The fixing device  500  includes a housing  502  installed to the body  110 . The first holder  510  and the second holder  520  are installed to the housing  502 . Meanwhile, the first holder  510  and the second holder  520  are rotatably installed to the housing  502 . 
     The first holder  510  may be provided with a first seat surface  512  that substantially comes into contact with the guide pin  14 . The first seat surface  512  may be formed of a shock absorbing material to prevent breakage thereof or to endure shock due to frequent contact with the guide pin  14 . 
     The first holder  510  has a first rotating shaft  518  that is a rotation center of the first holder  510 . The first rotating shaft  518  is inserted into a first hole  504  formed in the housing  502 . The first hole  504  may have a circular shape. 
     A first holder fixing piece  514  is fixed to one end of the first rotating shaft  518  to fix the first holder  510  so as not to be separated from the first hole  504 . 
     The other end of the first rotating shaft  518  and one end of the first holder fixing piece  514  have a greater cross section than a cross section of the first hole  504 . As such, it is possible to prevent the end of the first holder fixing piece  514  or the first rotating shaft  518  from being separated from the first hole  504  and to stably fix the first holder  510 . 
     The first holder  510  may be rotated about the first hole  504 , i.e. the first rotating shaft  518 . 
     Meanwhile, a first elastic member  519  is provided to apply restoration force to the first holder  510  such that the first holder  510  returns to an original position thereof when no external force is applied to the first holder  510 . One end of the first elastic member  519  may be fixed to the first holder  510  and the other end of the first elastic member  519  may be fixed to the housing  502 . 
     The first holder  510  has a first insert piece  516  protruding therefrom at a position opposite to the first rotating shaft  518 . The first insert piece  516  may extend downward from the first holder  510  by a predetermined length. 
     The housing  502  is provided with a first stopper  560  to selectively limit rotation of the first holder  510 . The first stopper  560  may be fixed in a pivotally rotatable manner by a spring  564 . Thus, the first stopper  560  may return to an original position thereof by elastic restoration force of the spring  564  when no external force is applied thereto. 
     The first stopper  560  includes a first extension member  562  extending downward therefrom. The first extension member  562  may come into contact with a push unit  550  that will be described later to operate the first stopper  560 . The first extension member  562 , i.e. a lower portion of the first stopper  560  may have a different shape from that of an upper portion of the first stopper  560  so as to come into contact with the push unit  550 . 
     The first stopper  560  is disposed on the housing  502  so as to selectively come into contact with the first insert piece  516 . 
     The second holder  520  may have a second seat surface  521  that substantially comes into contact with the guide pin  14 . The second seat surface  521  may be formed of a shock absorbing material to prevent breakage thereof or to endure shock due to frequent contact with the guide pin  14 . 
     The second holder  520  has a second rotating shaft  528  that is a rotation center of the second holder  520 . The second rotating shaft  528  is inserted into a second hole  506  formed in the housing  502 . The second hole  506  may have a circular shape. 
     A second holder fixing piece  522  is fixed to one end of the second rotating shaft  528  to fix the second holder  520  so as not to be separated from the second hole  506 . 
     The other end of the second rotating shaft  528  and one end of the second holder fixing piece  522  have a greater cross section than a cross section of the second hole  506 . As such, it is possible to prevent the end of the second holder fixing piece  522  or the second rotating shaft  528  from being separated from the second hole  506  and to stably fix the second holder  520 . 
     The second holder  520  may be rotated about the second hole  506 , i.e. the second rotating shaft  528 . 
     Meanwhile, a second elastic member  529  is provided to apply restoration force to the second holder  520  such that the second holder  520  returns to an original position thereof when no external force is applied to the second holder  520 . One end of the second elastic member  529  may be fixed to the second holder  520  and the other end of the second elastic member  529  may be fixed to the housing  502 . 
     The second holder  520  has a second insert piece  526  protruding thereform at a position opposite to the second rotating shaft  528 . The second insert piece  526  may extend downward from the second holder  520  by a predetermined length. 
     The housing  502  is provided with a second stopper  570  to selectively limit rotation of the second holder  520 . The second stopper  570  may be fixed in a pivotally rotatable manner by a spring  574 . Thus, the second stopper  570  may return to an original position thereof by elastic restoration force of the spring  574  when no external force is applied thereto. 
     The second stopper  570  includes a second extension member  572  extending downward therefrom. The second extension member  572  may come into contact with the push unit  550  that will be described later to operate the second stopper  570 . The second extension member  572  may have a different shape from that of an upper portion of the second stopper  570  so as to come into contact with the push unit  550 . 
     The second stopper  570  is disposed on the housing  502  so as to selectively come into contact with the second insert piece  526 . 
     The first holder  510  and the second holder  520  may be arranged such that the first seat surface  512  and the second seat surface  521  face each other. That is, the first holder  510  and the second holder  520  may be temporarily arranged parallel to each other. 
     In particular, the first holder  510  and the second holder  520  are individually installed to the housing  502  and, therefore, may be rotated independently of each other. This is because rotation of the first holder  510  has no effect on the second holder  520 . 
     Similarly, the first stopper  560  and the second stopper  570  may be arranged at the housing  502  so as to face each other. Of course, the first stopper  560  and the second stopper  570  are installed to the housing  502  so as to be rotatable independently of each other. 
     Meanwhile, the fixing device  500  includes the push unit  550  penetrating the housing  502 . 
     The push unit  550  may include a pressure piece  552  configured to come into contact with the door  20  so as to be selectively pressed by the door  20 , connector pieces  554  extending from the pressure piece  552  to penetrate the container  100  and a transfer piece  556  coupled to the connector pieces  554  to transfer force required to pivotally rotate the stopper  560 . 
     More specifically, a portion of the pressure piece  552  is exposed outward of the container  100 . In this case, the pressure piece  552  may have a greater cross section that a cross section of the connector pieces  554 . As such, a contact area between the pressure piece  552  and the door  20  may be increased and, consequently, the pressure piece  552  may be pressed at an increased area by the door  20  when coming into contact with the door  20 . 
     A portion of each connector piece  554  may be received in the container  100  and the connector piece  554  may serve to transfer force from the pressure piece  552  to the transfer piece  556 . 
     The connector pieces  554  take the form of two rods and are coupled respectively at one end thereof to the pressure piece  552 . Through this configuration, force applied to the pressure piece  552  may be distributed to the two connector pieces  554 , which may ensure stable transfer of force. 
     The connector piece  554  and the transfer piece  556  may be connected to each other via screwing, for example. 
     The push unit  550  may be moved in a front-and-rear direction relative to the housing  502 . Meanwhile, a spring may be installed to the push unit  550  to return the push unit  550  to an original position thereof when no external force is applied to the push unit  550  and to limit operation of the push unit  550 . 
     The transfer piece  556  has a first raised surface portion  557  and a second raised surface portion  558  which protrude more than the remaining portion of the transfer piece  556 . The first raised surface portion  557  may selectively come into contact with the first extension member  562  of the first stopper  560  and the second raised surface portion  558  may selectively come into contact with the second extension member  572  of the second stopper  570 . 
     The first raised surface portion  557  and the second raised surface portion  558  may be formed respectively at opposite sides of the transfer piece  556 . 
     Meanwhile, one end of the first raised surface portion  557  and one end of the second raised surface portion  558  may be inclined to provide a portion of the transfer piece  556  with a reduced width. As such, the transfer piece  556  may have a greater width at the first raised surface portion  557  and the second raised surface portion  558  than a width of the remaining portion of the transfer piece  556 . 
       FIG. 11  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 1  according to one embodiment. A description with reference to  FIG. 11  is as follows. 
     When the door  20  hermetically seals the storage compartment  2  as exemplarily shown in  FIG. 1 , the container  100  is positioned as exemplarily shown in  FIG. 2 . In this case, the container  100  is completely covered with the door  20  and is invisible from the outside in the state of  FIG. 1 . In addition, in such a state, the container  100  and the door  20  come into contact with each other. 
     Accordingly, the door  20  applies force to push the pressure piece  552 . As the pressure piece  552  is pushed, the first extension member  562  of the first stopper  560  comes into contact with the first raised surface portion  557  and the second extension member  572  of the second stopper  570  comes into contact with the second raised surface portion  558 . 
     The first raised surface portion  557  and the second raised surface portion  558  are portions protruding outward from the center of the transfer piece  556  and, therefore, may serve to vary rotation angles of the first stopper  560  and the second stopper  570 . 
     More specifically, the first stopper  560  is rotated clockwise by a predetermined angle from an original position thereof so as not to be caught by the first insert piece  516 . 
     In addition, the second stopper  570  is rotated clockwise by a predetermined angle from an original position thereof so as not to be caught by the second insert piece  526 . 
     The first stopper  560  and the second stopper  570  are rotated in a direction away from each other by the transfer piece  556 . 
     That is, the first holder  510  and the second holder  520  are no longer fixed by the first stopper  560  and the second stopper  570 . 
     The first holder  510  and the second holder  520  may be rotated when force required to allow the first holder  510  and the second holder  520  to overcome elastic force of the first elastic member  519  and the second elastic member  529  is applied thereto. 
     In this way, the fixing device  500  is released from the guide unit  12 . However, in such a state, although the container  100  is not fixed to the cabinet  10 , rotation of the container  100  is impossible because the door  20  comes into contact with the container  100  and prevents movement of the container  100 . 
     In particular, the first holder  510  is rotated counterclockwise by the guide pin  14 . That is, in a state in which the door  20  hermetically seals the storage compartment  2 , the first holder  510  is rotated toward the container  100  by a predetermined angle. In this case, to allow the first holder  510  to be rotated counterclockwise, the housing  502  and the first holder  510  may be installed to maintain a constant distance therebetween. 
     In the state as exemplarily shown in  FIG. 11 , the first holder  510  is rotated and the second holder  520  remains stationary. That is, any one of the first holder  510  and the second holder  520  may be rotated. 
       FIG. 12  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 2  according to one embodiment. A description with reference to  FIG. 12  is as follows. 
     To access the container  100  from the front side of the container  100  or to access food stored inside the door  20 , the user may rotate the door  20  alone as exemplarily shown in  FIG. 2 . In this case, the container  100  remains fixed to the cabinet  10 . 
     When the user rotates the door  20  alone while remaining the container  100  stationary, as exemplarily shown in  FIG. 11 , the door  20  no longer applies push force to the pressure piece  552 . In this case, the user may use the above-described fastening device  600 . 
     When the door  20  is rotated alone, the door  20  is moved away from the container  100  and no longer applies force to the pressure piece  552 . 
     Accordingly, the first raised surface portion  557  does not come into contact with the first extension member  562  of the first stopper  560 . Likewise, the second raised surface portion  558  does not come into contact with the second extension member  572  of the second stopper  570 . 
     The first stopper  560  and the second stopper  570  respectively come into contact with a narrower portion of the transfer piece  556  than the first raised surface portion  557  and the second raised surface portion  558 . That is, as compared to  FIG. 11 , the first stopper  560  and the second stopper  570  are rotated counterclockwise so as to be located close to each other. 
     Accordingly, the first stopper  560  may be caught by the first insert piece  516 , thus serving to limit rotation of the first holder  510 . Likewise, the second stopper  570  may be caught by the second insert piece  526 , thus serving to limit rotation of the second holder  520 . 
     Since rotation of both the first holder  510  and the second holder  520  is impossible, the fixing device  500  is fixed to the guide pin  14 . Thus, the container  100  is fixed to the cabinet  10 . 
     Meanwhile, in the state of  FIG. 12 , the guide pin  14  may come into contact with the first seat surface  512  and the second seat surface  521 . 
     In conclusion, when the user rotates the door  20  alone by the fastening device  600  in the state of  FIG. 11 , the fixing device  500  is positioned to couple the container  100  to the cabinet  10 . In this way, the container  100  may remain coupled to the cabinet  10  in a pivotally rotated state of the door  20 . 
       FIG. 13  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 3  according to one embodiment. A description with reference to  FIG. 13  is as follows. 
     The user may simultaneously rotate the container  100  and the door  20  as exemplarily shown in  FIG. 3 . 
     In this case, in the state as exemplarily shown in  FIG. 11 , the door  20  and the container  100  are rotated together. This is because the door  20  and the container  100  are rotated relative to the cabinet  10  by the first hinge  40  while maintaining a distance between the door  20  and the container  100 . To simultaneously rotate the door  20  and the container  100 , the user may operate the fastening device  600  in the above-described manner. Operation of the fastening device  600  will not be described hereinafter. 
     In the state of  FIG. 11 , the fixing device  500  does not fix the container  100  to the cabinet  10 . That is, the second holder  520  is not engaged with the second stopper  570 . Thus, the second holder  520  may be rotated counterclockwise upon receiving relatively low force required to allow the second holder  520  to overcome elastic restoration force of the second elastic member  529 . 
     In this case, the second holder  520  may be rotated counterclockwise as the door  20  and the container  100  are moved downward because the guide pin  14  is integrated with the cabinet  10  and remains stationary. In this case, the second holder  520  comes into contact with the guide pin  14  and is sufficiently rotated counterclockwise by the guide pin  14 . In particular, when the second holder  520  is sufficiently rotated, the second holder  520  no longer comes into contact with the guide pin  14 . 
     That is, the fixing device  500  is not fixed to the guide pin  14  and, therefore, the user may rotate the door  20  and the container  100  relative to the cabinet  10  to access food stored in the storage compartment  2 . 
     Of course, in a state in which the container  100  and the door  20  have been sufficiently rotated relative to the cabinet  10  as exemplarily shown in  FIG. 3 , the second holder  520  must be further rotated counterclockwise beyond what is shown in  FIG. 13 . In addition, the guide pin  14  is located far from the fixing device  500 . 
       FIG. 14  is a view showing transition from the state of  FIG. 13  to the state of  FIG. 11  in sequence. A description with reference to  FIG. 14  is as follows. 
     The user must rotate the door  20  and the container  100  to the state as exemplarily shown in  FIG. 1  after retrieving food stored in the storage compartment  2  or inserting food into the storage compartment  2 . 
     In this case, in a state in which the container  100  and the door  20  are rotated together as exemplarily shown in  FIG. 3 , the second holder  520  remains rotated counterclockwise as exemplarily shown in (a) of  FIG. 14 . This is because the second elastic member  529  cannot apply elastic restoration force to the second holder  520  once the second holder  520  is rotated beyond a given angle. Since the second elastic member  529  cannot provide elastic restoration force, the second holder  520  remains stationary in a counterclockwise rotated state. 
     When the user rotates the door  20  and the container  100  inward of the storage compartment  2 , the second holder  520  comes into contact with the guide bar  15 . In this case, as the user gradually rotates the container  100  upward, the second holder  520  successively comes into contact with different portions of the guide bar  15 . 
     In particular, the guide bar  15  is pivotally rotatable and does not apply strong instantaneous force to the second holder  520 . That is, when the second holder  520  applies great force to the guide bar  15 , the guide bar  15  may be rotated counterclockwise as exemplarily shown in (b) of  FIG. 14 . 
     Accordingly, it is possible to prevent the guide bar  15  from being broken by colliding with the second holder  520 . 
     Through gradual transition between the states shown in (c) of  FIG. 14  and (d) of  FIG. 14 , the second holder  520  may be rotated clockwise and be positioned as exemplarily shown in  FIG. 11 . 
       FIG. 15  is a view showing a fixing device according to another embodiment of the present invention, which is installed to the container.  FIG. 15  differs from  FIG. 4  only in terms of the shape of the fixing device  1500  and thus, a description of other configurations will be omitted hereinafter. 
       FIG. 16  is a schematic view showing pivotal rotation of the door according to another embodiment of the present invention. A description with reference to  FIG. 16  is as follows. 
     In  FIG. 16 , (a) shows a state in which the door  20  hermetically seals the storage compartment  2  as exemplarily shown in  FIG. 1  and the door  20  and the container  100  are located adjacent to each other. 
     In a state in which the door  20  is located at the front of the container  100 , the container  100  is slightly tilted. That is, as exemplarily shown in (a) of  FIG. 16 , on the basis of one surface of the door  20 , the right side of the container  100  may be located farther from the door  20  than the left side of the container  100 . 
     The fixing device  1500  is located at the left side of the container  100 . 
     In  FIG. 16 , (b) shows a state in which the door  20  is rotated alone as exemplarily shown in  FIG. 2  and the door  20  and the container  100  are spaced apart from each other. 
     In this case, when the door  20  is rotated alone, the container  100  remains fixed to the cabinet  10  by the fixing device  500 . However, differently from the state as exemplarily shown in (a) of  FIG. 16 , the container  100  is horizontally oriented rather than being tilted and is drawn toward the user by a predetermined distance. 
     That is, once the user rotates the door  20 , the container  100  is moved toward the user and, therefore, the user can easily access the container  100 . 
     This movement of the container  100  is possible because the rotating shaft  42  of the first hinge  40  and the rotating shaft  206  of the second hinge  200  are located at different positions. In other words, centers of the rotating shaft  42  of the first hinge  40  and the rotating shaft  206  of the second hinge  200  are not present in the same line. That is, since the rotating shaft  42  of the first hinge  40  and the rotating shaft  206  of the second hinge  200  are arranged parallel to each other at different positions when viewed from the top, once the door  20  is rotated relative to the cabinet  10 , the container  100  must be rotated under the influence of rotation of the door  20 . This is because the container  100  is pivotally rotatably connected to the door  20  via the second hinge  200  and the rotating shaft  206  of the second hinge  200  is rotated relative to the rotating shaft  42  of the first hinge  40  when the door  20  is rotated. 
     Meanwhile, it will be appreciated that the fixing device  1500  is moved downward in the state as exemplarily shown in (b) of  FIG. 16  beyond a position as shown in (a) of  FIG. 16 . The fixing device  1500  is installed to the container  100  that is moved upon rotation of the door  20  and, thus, the fixing device  1500  is moved simultaneously with rotation of the door  20 . 
     In the state as exemplarily shown in (b) of  FIG. 16 , the fixing device  1500  may remain caught by the cabinet  10  and, therefore, the container is not rotated along with the door  20 . 
       FIG. 17  is a view showing another embodiment of portion ‘A’ of  FIG. 3  in detail. A description with reference to  FIG. 17  is as follows. 
     A guide unit  1012  is installed to the top of the cabinet  10  to protrude into the storage compartment  2 . In this case, the guide unit  1012  may protrude downward from the top of the cabinet  10 . 
     The guide unit  1012  may include a guide pin  1016  in the form of a cylinder. The guide pin  1016  is fixed at a predetermined position rather than being movable within the cabinet  10 . 
     The guide pin  1016  may have a predetermined thickness and, thus, achieve a given level of strength. Accordingly, as the guide pin  1016  comes into contact with the fixing device  1500 , the guide pin  1016  may be moved by the fixing device  1500  or movement of the guide pin  1016  may be limited by the fixing device  1500 . 
       FIG. 18  is a view showing the fixing device according to another embodiment,  FIG. 19  is a left side view of  FIG. 18 ,  FIG. 20  is a right side view of  FIG. 18  and  FIG. 21  is an exploded perspective view of  FIG. 18 . A description with reference to  FIGS. 18 to 21  is as follows. 
     Movement of the fixing device  1500  relative to the guide unit  1012  may be selectively limited. That is, the fixing device  1500  may be movable relative to the guide unit  1012  at a specific position where movement of the fixing device  1500  relative to the guide unit  1012  is permitted, and may be immovable relative to the guide unit  1012  at a specific position where movement of the fixing device  1500  relative to the guide unit  1012  is not permitted. 
     In addition, the fixing device  1500  may be installed to the top of the container  100 . This position of the fixing device  1500  is determined to ensure contact between the fixing device  1500  and the guide unit  1012 . 
     The fixing device  1500  includes a housing  1502  installed to the body  110 . The housing  1502  is provided with a plurality of components to allow the fixing device  1500  to come into contact with the guide unit  1012 . 
     The housing  1502  may have a circular hole  1504 . 
     A holder  1510  is installed to the housing  1502  so as to be rotatable relative to the housing  1502 . In this case, the holder  1510  may include a rotating shaft  1512  configured to be inserted into the hole  1504  and coupled to a holder fixing piece  1530 . As such, the rotating shaft  1512  of the holder  1510  is rotatable in the hole  1504  without a risk of separation from the hole  1504 . 
     The holder  1510  may include a plate  1511  and the rotating shaft  1512  may protrude downward from the plate  1511 . The plate  1511  may be rotated about the rotating shaft  1512 . Although the plate  1511  may have a circular shape, the plate  1511  may be altered into various other shapes. 
     A guide piece  1514  may be formed at an upper surface of the plate  1511  to guide a movement path of the guide pin  1016 . 
     The guide piece  1514  may include two parallel guide walls  1516 . A longitudinal space having a predetermined length may be present between the two guide walls  1516  and the guide pin  1016  may be moved between the guide walls  1516 . Movement of the guide pin  1016  across the guide walls  1516  rather than movement of the guide pin  1016  along the space between the two guide walls  1516  is impossible. Thus, the guide walls  1516  may serve to limit a movement path of the guide pin  1016 . 
     The guide piece  1514  may have an opening  1518  between ends of the two guide walls  1516 . When the guide pin  1016  escapes from the guide piece  1514  through the opening  1518 , the fixing device  1500  may no longer have an effect on a movement path of the guide unit  1012 . 
     A first elastic member  1528  is installed to provide the holder  1510  with elastic restoration force required to return the holder  1510  to an original position thereof when force applied to the holder  1510  is removed. One end of the first elastic member  1528  may be coupled to a lower surface of the plate  1511  and the other end of the first elastic member  1528  may be coupled to the housing  1502 . As such, the first elastic member  1528  may be stretched when the fixing device  1500  is pressed and, then, may return to an original state thereof when external force pressing the fixing device  1500  is removed. 
     A cam  1520  is coupled to the rotating shaft  1512  to selectively allow or prevent rotation of the holder  1510 . In this case, whether the holder  1510  is rotatable or not rotatable may be determined by a shape of the cam  1520 . The cam  1520  is installed to the rotating shaft  1512  so as to be rotated by the same angle as the rotating shaft  1512 . 
     The cam  1520  may have a first protrusion  1522  and a second protrusion  1524  formed at positions opposite to each other. The first protrusion  1522  may be tapered to be reduced in thickness with increasing distance from the rotating shaft  1512  that is located in the center of the cam  1520 . The second protrusion  1524  may have a flat end surface and, thus, may come into surface contact with another member. 
     The cam  1520  may further have a slope  1526  configured to come into contact with a push unit  1550  that will be described later, the slope  1526  serving to guide rotation of the cam  1520 . The slope  1526  may be curved to guide continuous rotation of the cam  1520 . 
     The fixing device  1500  includes the push unit  1550  which may be pushed by pressure applied from the door  20 . When the door  20  applies pressure to the push unit  1550 , the push unit  1550  may be moved linearly. 
     The push unit  1550  may include a pressure piece  1552  configured to come into contact with and be selectively pushed by the door  20  and a transfer piece  1554  coupled to the pressure piece  1552  to rotate the holder  1510  while linearly moving the holder  1510 . 
     The pressure piece  1552  may be partially received in the container  100  and force applied to the pressure piece  1552  may be transferred to the transfer piece  1554 . 
     The push unit  1550  may be moved in a front-and-rear direction relative to the housing  1502 . 
     The transfer piece  1554  may be coupled to the housing  1502  via a spring  1556 . As such, when the transfer piece  1554  is moved away from the housing  1502  upon receiving external force, the spring  1556  is stretched. On the other hand, when external force to urge the transfer piece  1554  away from the housing  1502  is removed, the spring  1556  may return to an original length thereof to maintain a constant distance between the transfer piece  1554  and the housing  1502 . 
     The first elastic member  1528  and the spring  1556  may be deformed by tension and store elastic force as stretched lengths thereof return to original lengths by restoration. 
     The transfer piece  1554  has a receiving bore  1560  in which the cam  1520  to be coupled to the holder  1510  is received. 
     In this case, the rotating shaft  1512  of the holder  1510  passes through the hole  1504  and the receiving bore  1560  to thereby be coupled to the holder fixing piece  1530 . In particular, the cam  1520  may be engaged with the rotating shaft  1512  and may be rotated simultaneously with rotation of the rotating shaft  1512 . 
     The receiving bore  1560  is selectively provided at an inner circumference thereof with a seat groove  1562  in which the first protrusion  1522  is received and fixed. The seat groove  1562  may have a shape corresponding to a shape of the first protrusion  1522 . For example, the seat groove  1562  may have a tapered shape such that a width of the seat groove  1562  is reduced inwardly. 
     The receiving bore  1560  may have a stepped seat portion  1564  by which the second protrusion  1524  is caught when the cam  1520  is rotated to some extent. The stepped seat portion  1564  may be defined in the receiving bore  1560  and have a predetermined area. 
     The inner circumference of the receiving bore  1560  may come into contact with the slope  1526  of the cam  1520  and guide the cam  1520  to enable rotation of the cam  1520 . 
       FIG. 22  is a view explaining operation of the push unit, the cam and the receiving bore according to another embodiment. A description with reference to  FIG. 22  is as follows. 
     In  FIG. 22 , (a) shows a state in which the push unit  1550  is not pushed and (b) to (d) show stepwise push operation of the push unit  1550 . That is, a push degree of the push unit  1550  is increased from (b) to (d) of  FIG. 22 . 
     As exemplarily shown in (a) of  FIG. 22 , when the push unit  1550  is not pushed, a spring  1556  remains in an original state thereof rather than being stretched. 
     In this case, the cam  1520  remains in a fixed state so as not to be rotated because the first protrusion  1522  is inserted in the seat groove  1562 . In particular, clockwise rotation as well as counterclockwise rotation of the cam  1520  are impossible because both sides of the first protrusion  1522  are caught by the seat groove  1562 . 
     In the state as exemplarily shown in (a) of  FIG. 22 , a gap having a length “1” is present between the cam  1520  and the inner circumference of the receiving bore  1560 . 
     As exemplarily shown in (b) of  FIG. 22 , when the push unit  1550  is pushed, the cam  1520  is moved linearly within the receiving bore  1560 . That is, the cam  1520  may be pushed until a lower end of the cam  1520  comes into contact with the inner circumference of the receiving bore  1560  and the gap “1” shown in (a) of  FIG. 22  is removed. 
     In this case, even if the push unit  1550  is moved upward as compared to that in (a) of  FIG. 22 , the cam  1520  is installed to the housing  1502  and, thus, remains stationary rather than being moved upward along with the push unit  1550 . Thereby, the first protrusion  1522  may escape from the seat groove  1562 . 
     In particular, when the push unit  1550  is pushed until it reaches a position where the gap “1” is removed (this position is referred to as the “specific position”), the cam  1520  is moved linearly within the receiving bore  1560  without implementation of rotation. More specifically, since rotation of the cam  1520  occurs simultaneously with rotation of the holder  1510 , the holder  1510  is not rotated while the push unit  1550  is being pushed to the specific position. 
     As the receiving bore  1560  is displaced away from the housing  1502 , the spring  1556  may be stretched. 
     As exemplarily shown in (c) of  FIG. 22 , as the push unit  1550  is further pushed beyond the specific position shown in (b) of  FIG. 22 , the slope  1526  comes into contact with the inner circumference of the receiving bore  1560 , thereby being rotated. 
     Owing to the slope  1526  having a curved shape, the cam  1520  may be continuously rotated counterclockwise as the push unit  1550  is pushed. This is because the holder  1510  is installed to the housing  1502  and, thus, the cam  1520  installed to the holder  1510  cannot be moved relative to the housing  1502  even if the push unit  1550  is pushed. Accordingly, linear movement of the push unit  1550  causes rotation of the cam  1520 . 
     That is, when the push unit  1550  is further pushed beyond the specific position, the cam  1520  begins to rotate. In this case, the specific position may refer to a state in which the push unit  1550  is pushed such that the cam  1520  and the receiving bore  1560  meet each other. 
     As exemplarily shown in (d) of  FIG. 22 , as the push unit  1550  is further pushed, the second protrusion  1524  comes into contact with the stepped seat portion  1564  after the cam  1520  is sufficiently rotated counterclockwise. Since the second protrusion  1524  has one flat surface and, likewise, the stepped seat portion  1564  has one flat surface, rotation of the cam  1520  may stop when the second protrusion  1524  comes into contact with the stepped seat portion  1564 . 
     That is, once the push unit  1550  is pushed to reach a position as exemplarily shown in (d) of  FIG. 22 , the push unit  1550  is no longer pushed and, thus, rotation of the holder  1510  may stop. 
       FIG. 23  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 1  according to another embodiment. In  FIG. 23 , (a) is a top plan view and (b) is a detailed view showing an inner configuration. A description with reference to  FIG. 23  is as follows. 
     When the door  20  hermetically seals the storage compartment  2  as exemplarily shown in  FIG. 1 , the container  100  is located at a position as exemplarily shown in  FIG. 2 . In this case, the container  100  is completely covered with the door  20  and is invisible in the state of  FIG. 1 . In addition, the container  100  and the door  20  come into contact with each other. 
     Accordingly, the pressure piece  1552  is pushed by the door  20 . As the pressure piece  1552  is pushed, the holder  1510  is rotated, thus causing the guide piece  1514  to be rotated. In this case, the cam  1520  is positioned as exemplarily shown in (d) of  FIG. 22  and positions of other inner components of the fixing device  500  are equal to the above description of (d) of  FIG. 22 . 
     That is, additional counterclockwise rotation of the holder  1510  does not occur because the second protrusion  1524  of the cam  1520  comes into contact with the stepped seat portion  1564 . 
     The fixing device  1500  cannot limit movement of the guide unit  1012 . That is, the guide pin  1016  may be moved between the guide walls  1516 . 
     However, in such a state, although the container  100  is not fixed to the cabinet  10 , the door  20  comes into contact with the container  100 , thereby preventing movement of the container  100 . Thus, rotation of the container  100  is impossible. 
       FIG. 24  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 2  according to another embodiment. In  FIG. 24 , (a) is a top plan view and (b) is a detailed view showing an inner configuration. A description with reference to  FIG. 24  is as follows. 
     The user may rotate the door  20  alone as exemplarily shown in  FIG. 2  to access the container  100  through the front of the container  100  or to access food stored inside the door  20 . In this case, the container  100  remains fixed to the cabinet  10 . 
     When the user rotates the door  20  alone in a stationary state of the container  100 , as exemplarily shown in  FIG. 23 , push force applied from the door  20  to the pressure piece  1552  is removed. In this case, the user may use the above-described fastening device  600 . 
     When the door  20  is rotated alone, a distance between the container  100  and the door  20  is increased and force applied to the pressure piece  1552  is removed and, therefore, external force applied to the first elastic member  1528  and the spring  1556  is removed. As such, the first elastic member  1528  and the spring  1556  exert elastic restoration force to return to original shapes thereof. 
     Accordingly, the holder  1510  is rotated clockwise in the state shown in  FIG. 23 . That is, the holder  1510  is operated in an inverse sequence of that shown in  FIG. 22 . That is, as the cam  1520  is rotated clockwise and thereafter is again moved upward, the first protrusion  1522  is inserted into and fixed in the seat groove  1562 . 
     Since rotation of the cam  1520 , i.e. rotation of the holder  1510  is limited, the holder  1510  remains in a fixed state even if the guide pin  1016  collides with the holder  1510 . 
     As the pressure piece  1552  is moved downward as compared to  FIG. 24 , a portion of the pressure piece  1552  to be exposed outward may be increased. 
     The guide pin  1016  is not moved in a front-and-rear direction and remains stationary between the two guide walls  1516  because the guide walls  1516  extend in an approximately horizontal direction. That is, to allow the container  100  to be rotated relative to the cabinet  10 , it is necessary to orient the guide walls  1516  in a direction as exemplarily shown in  FIG. 23 . However, the container  100  may be in a state in which the container  100  is substantially fixed to the cabinet  10  because the guide walls  1516  are arranged in the state of  FIG. 24 . 
     In conclusion, when the user rotates the door  20  alone using the fastening device  600  in the state of  FIG. 23 , the fixing apparatus  1500  is positioned to couple the container  100  to the cabinet  10 . In this way, the container  100  may be continuously coupled to the cabinet  10  in a pivotally rotated state of the door  20 . 
       FIG. 25  is a view showing operation of the guide unit and the fixing device in the state of  FIG. 3  according to another embodiment. In  FIG. 25 , (a) is a top plan view and (b) is a detailed view showing an inner configuration. A description with reference to  FIG. 25  is as follows. 
     The user may simultaneously rotate the container  100  and the door  20  as exemplarily shown in  FIG. 3 . As such, the user can access the storage compartment  2 . 
     In this case, in the state shown in  FIG. 23 , the door  20  and the container  100  are rotated together. The user rotates the door  20  and the container  100  relative to the cabinet  10  in the state of  FIG. 23 . 
     To simultaneously operate the door  20  and the container  100 , the user may operate the fastening device  600  in the above-described manner. 
     When the container  100  and the door  20  are rotated together, the guide pin  1016  passes the space between the two guide walls  1516  and, thereafter, escapes from the guide walls  1516  through the opening  1518 . 
     Even in the state shown in  FIG. 23 , the guide pin  1016  is not fixed by the fixing device  1500  and, therefore, the user can access food stored in the storage compartment  2  by rotating the container  100  and the door  20  relative to the cabinet  10 . 
     The user must rotate the door  20  and the container  100  to the state as exemplarily shown in  FIG. 1  after retrieving food stored in the storage compartment  2  or inserting food into the storage compartment  2 . 
     Once the user rotates the door  20  and the container  100  inward of the storage compartment  2 , the pressure piece  1552  is rotated while remaining in a pushed state because the door  20  and the container  100  are rotated together. 
     Accordingly, the guide pin  1016  enters the space between the two guide walls  1516  through the opening  1518  and, thereafter, is moved between the two guide walls. Of course, the guide pin  1016  is a component fixed to the cabinet  10  and the holder  1510 , i.e. the container  100  actually implements movement. 
     Meanwhile, the state shown in  FIG. 23  is equal to the state shown in (d) of  FIG. 22  and the second protrusion  1524  is continuously caught by the stepped seat portion  1564 . 
     The present invention should not be construed as limited to the embodiments set forth herein. It should be understood that various modifications can be made by those skilled in the art within the spirit and scope of the invention as defined by the claims and these modifications should not be understood independently of the technical sprit or prospect of the invention. 
     MODE FOR THE INVENTION 
     As described above, a related description has sufficiently been discussed in the above “Best Mode” for implementation of the present invention. 
     INDUSTRIAL APPLICABILITY 
     As described above, the present invention may be wholly or partially applied to a refrigerator.