Abstract:
A refrigerator may include a cabinet disposed at a storage compartment, a door hinged to the cabinet and configured to open and close at least a portion of the storage compartment, the door including an outer door defining a front appearance of the door, a door dike defining a rear appearance of the door, and an inner space located between the outer door and the door dike, a moving frame configured to move vertically with respect to the door dike, the moving frame including a supporter configured to extend from the door dike to the inner space, and a rail embedded in the inner space configured to support the supporter.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. P2016-0001282, filed on Jan. 5, 2016, which is hereby incorporated by reference as if fully set forth herein. 
       FIELD 
       [0002]    The present application relates to a refrigerator, and more particularly, to a refrigerator including a moving shelf or a moving basket. 
       BACKGROUND 
       [0003]    In general, a refrigerator is an apparatus that discharges cool air generated by a refrigerating cycle involving a compressor, a condenser, an expansion valve, and an evaporator to lower the temperature in the refrigerator such that food is stored in a frozen state or in a refrigerated state. 
         [0004]    A refrigerator generally includes a freezing compartment for storing food or beverages in a frozen state and a refrigerating compartment for storing food or beverages in a refrigerated state. 
         [0005]    Refrigerators are classified into a top mount type refrigerator, in which a freezing compartment is disposed above a refrigerating compartment, a bottom freezer type refrigerator, in which a freezing compartment is disposed under a refrigerating compartment, or a side by side type refrigerator, in which a freezing compartment and a refrigerating compartment are disposed side by side. In each case, doors are provided at the freezing compartment and the refrigerating compartment, respectively, such that access to the freezing compartment and the refrigerating compartment is possible through the doors. 
         [0006]    In addition to refrigerators in which a freezing compartment and a refrigerating compartment are partitioned from each other, there are also refrigerators in which access to a freezing compartment and a refrigerating compartment is possible through a single door. Most such single door type refrigerators are small-sized, and the freezing compartment is generally provided in a specific space inside the refrigerating compartment. 
         [0007]    There are also French type refrigerators, in which an upper refrigerating compartment is opened and closed by left and right doors, as a kind of top mount type refrigerator. A freezing compartment of the French type refrigerator may also be opened and closed by left and right doors. 
         [0008]    In recent years, a home bar, an ice maker, a shelf, and a basket have been frequently mounted at the rear of the door of the refrigerator in order to use the rear of the door as an additional storage space or an additional functional space. That is, the door has additional functions, such as the provision of additional storage space or the production and supply of ice or cold water, in addition to simply opening and closing the freezing compartment or the refrigerating compartment. 
         [0009]    A refrigerator having a sub door for opening and closing a sub storage compartment provided in a main door has been proposed. This type of refrigerator may be called a door in door (DID) refrigerator. When the main door is opened, a main storage compartment is used, and when the sub door is opened while the main door is closed, the sub compartment may be used. 
         [0010]    The sub storage compartment may be disposed at the rear side of the main door and may be a storage area partially separated by a partition from the main storage compartment. Recently, an area for the sub storage compartment is formed not at part of the main door but at substantially the entire main door. 
         [0011]    Goods that are frequently used, such as beverages, may be stored in the sub storage compartment, and the sub storage compartment includes a plurality of shelves and a plurality of baskets. Since the height of goods vary, it may be necessary to change the positions of the shelves and the baskets as occasion demands. 
       SUMMARY 
       [0012]    According to one aspect, a refrigerator may include a cabinet disposed at a storage compartment, a door hinged to the cabinet and configured to open and close at least a portion of the storage compartment, the door including an outer door defining a front appearance of the door, a door dike defining a rear appearance of the door, and an inner space located between the outer door and the door dike, a moving frame configured to move vertically with respect to the door dike, the moving frame including a supporter configured to extend from the door dike to the inner space, and a rail embedded in the inner space configured to support the supporter. 
         [0013]    Implementations according to this aspect may include one or more of the following features. For example, the door dike may include a cut-shaped rail mount unit, and the rail may be coupled to the rail mount unit at the inner space. The rail and the rail mount unit are covered by a rail cover bracket disposed at the inner space. The rail cover bracket is coupled to the rail, wider than the rail and the rail coupling unit, and completely covers the rail and the rail coupling unit. When the inner space is filled with a filler, the rail cover bracket is disposed to separate the inner space into a first space for the filler and a second space for accommodating the rail and the rail coupling unit. the rail cover bracket includes a lattice rib at an outer surface of the rail cover bracket to increase a coupling area between the rail cover bracket and the filler. 
         [0014]    The door dike includes a rail coupling opening through which the supporter is configured to move forward and rearward along the rail to be coupled to the rail. The moving frame is configured to have a square closed loop by aluminum die-casting. The moving basket may include a basket that is configured to accommodate goods coupled to the moving frame, and wherein the moving frame and the basket are configured to move in an integrated manner. The supporter includes a supporter frame including a plurality of rollers at upper and lower parts of the supporter, and the moving frame includes an extending frame coupled to the supporter frame. The basket is seated at an upper part of the moving frame and the moving frame is configured to be inserted into a lower part of the basket such that the moving frame supports load applied to the basket. The basket includes insertion grooves which are configured to receive the extending frame. 
         [0015]    The insertion grooves are located at both left and right sides of the basket. The supporter may include rollers disposed at upper and lower sides of the supporter, and the rail includes a roller guide configured to move the rollers vertically. The roller guide includes a plurality of roller openings spaced a distance away from one another at one side of the roller guide. The outer parts of the rollers include an elastic material, and the rollers are configured to elastically deform based on the rollers moving along the roller guide, and elastically restore at the roller openings to be partially inserted into the roller openings. The supporter includes a lever that is configured to be selectively inserted into the roller openings to limit the vertical movement of the moving frame. The supporter includes an operation unit that is configured to adjust displacement of the lever based on the user&#39;s input displacement. The refrigerator includes a spring disposed between the operation unit and the lever, the spring being configured to return the operation unit and the lever to an original position. An interlocking part is located between the operation unit and the lever, and the interlocking part, the operation unit, the lever, and the spring are accommodated in a supporter cover. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]      FIG. 1  is a view illustrating an example of a refrigerator; 
           [0017]      FIG. 2  is a view, as seen from the front of an example main door, illustrating the main door mounted with an example moving basket illustrated in  FIG. 1 ; 
           [0018]      FIG. 3  is a view, as seen from the rear of the main door, illustrating the main door mounted with the moving basket illustrated in  FIG. 1 ; 
           [0019]      FIG. 4  is an exploded view illustrating the main door illustrated in  FIG. 2 ; 
           [0020]      FIG. 5  is a cross-sectional view schematically illustrating an example coupling structure between an example door dike and an example rail; 
           [0021]      FIG. 6  is a cross-sectional view illustrating an example coupling structure of the door dike, the rail, and the moving basket; 
           [0022]      FIG. 7  is a view illustrating an example moving basket; 
           [0023]      FIG. 8  is an exploded view illustrating the moving basket illustrated in  FIG. 7 ; 
           [0024]      FIG. 9  is a bottom view illustrating the coupling structure of the moving basket and the rail illustrated in  FIG. 7 ; and 
           [0025]      FIG. 10  is a cross-sectional side view illustrating an example coupling structure of the moving basket and the rail. 
       
    
    
     DETAILED DESCRIPTION 
       [0026]    As illustrated in  FIG. 1 , a refrigerating compartment is provided in the upper part of a cabinet  10  and a freezing compartment is provided in the lower part of the cabinet  10 . The refrigerating compartment and the freezing compartment may be portions of a storage compartment or a main storage compartment  11  provided in the cabinet  10 . 
         [0027]    The refrigerator may include any refrigerator having a door hinged to a cabinet for opening and closing a storage compartment of the refrigerator. 
         [0028]    A left refrigerating compartment door  20  and a right refrigerating compartment door  25  are configured for opening and closing the refrigerating compartment, and are hinged to the left and right sides of the cabinet  10 . In some examples a single refrigerating compartment door may be hinged to the cabinet  10 . 
         [0029]    A left freezing compartment door  30  and a right freezing compartment door  40  may be respectively hinged to the left and right sides of the lower part of the cabinet  10  such that the left freezing compartment door and the right freezing compartment door are respectively provided under the left refrigerating compartment door and the right refrigerating compartment door. In some examples a single freezing compartment door may be hinged to the cabinet, or may be a drawer type door, which is separably mounted in the cabinet in the forward-rearward direction. 
         [0030]    A handle groove  32  may be provided at the top surface of the left freezing compartment door  30 , and a handle groove may also be provided at the top surface of the right freezing compartment door  40 . 
         [0031]    As shown in  FIG. 1 , the right refrigerating compartment door  25  may include a main door  100  hingedly mounted to one side of the cabinet  10  and a sub door  200  hingedly mounted to the main door  100  or the cabinet  10 . As provided both the main door  100  and the sub door  200  may be opened to access the refrigerating compartment. 
         [0032]    An opening  120  may be provided in the inner middle part of the main door  100 , and a sub storage compartment or a door basket may be provided at the rear of the main door  100 . 
         [0033]    The sub door  200  may be opened to access the sub storage compartment through the opening  120  of the main door  100 . That is, only the sub door  200  may be opened to access the sub storage compartment or the door basket without opening  120  the main door  100 . 
         [0034]    A groove-shaped handle  240  may be provided at the left side of a panel assembly of the sub door  200 . The handle  240  may extend in the upward-downward direction, and may have a length equal to the height of the panel. The sub door  200  may be a left sub door provided at the left side of the cabinet  10 . In this case, the handle  240  may be formed on the opposite side. 
         [0035]    In addition, the rotational direction of the sub door  200  may be identical to that of the main door  100 . 
         [0036]    In the refrigerator, the sub door  200  may be formed to be smaller than the main door  100  while being inserted into the opening  120  of the main door  100  when the sub door  200  is closed. The refrigerator includes a moving basket mounted at the main door  100 . A user may use the moving basket only when the sub door  200  is opened, and the moving basket may be used when the main door  100  is opened 
         [0037]    As illustrated in  FIG. 1 , the main door  100  may include an outer door substantially forming an appearance of the main door  100 . The outer door  130  may form a front surface and both side surfaces of the main door  100 . 
         [0038]    A door dike  150  may be provided at the rear of the outer door  130 . The door dike  140  may faun the rear surface of the main door  150 . 
         [0039]    In general, the door dike  140  may be formed of a plastic. A part of the door dike  140  may be formed to be inserted into a part of the storage compartment. The door dike  140  may be referred to as a door liner. A gasket may be mounted at the door dike  140 . The gasket is coupled to the cabinet to seal the gap to prevent leakage of cool air. 
         [0040]    Cap decoration parts  160  and  170  may be disposed at the main door  100 . The cap decoration parts  160  and  170  may include an upper cap decoration part  170  for forming the upper surface of the main door  100  and a lower cap decoration part  160  for forming the lower surface of the main door  100 . 
         [0041]    The main door  100  may be formed by coupling the outer door  130  for forming the front surface and both side surfaces of the main door  100 , the door dike for forming the rear surface of the main door  100 , and the cap decoration parts  160  and  170  for forming the upper and lower surfaces of the main door  100  to one another. A space may be formed at an inner part of the above coupled configurations. The space is filled with a foaming agent. 
         [0042]    The main door  100  may include a door frame  140 . When the user opens the sub door of the door in door (DID) refrigerator, the door frame  140  may be provided to access the sub storage compartment or the door basket which are disposed at the rear side of the main door  100 . The door frame  140  may be provided to form a hole at the front-central part of the main door  100 . 
         [0043]    The main door  100  may be formed by coupling the outer door  130 , the door frame  140 , the door dike  150 , and the cap decoration parts  160  and  170  to one another. A space may be formed at an inner part of the above coupled configurations. 
         [0044]    The moving basket  300  may be mounted at the door dike  150 . In general, in order to reduce the weight of the door, the moving basket  300  may be formed to have a thin thickness and a plastic plate shape. Thus, it is difficult to support the moving basket  300  through the door dike  150 . This is because, when a bracket supporting the basket is coupled to the door dike  150 , the coupled part of the door dike may be damaged. 
         [0045]    When a rail for guiding movement of the moving basket is mounted at the door dike  150 , the rail may be visibly exposed as well as the door dike  150  may be damaged. In addition, the storage space may be reduced by the rail. 
         [0046]    The rail  400  supporting the moving basket  300  may be disposed in the door dike  150 . Namely, the door dike  150  may do not include a separate protruding part. While the appearance of the door dike  150  is maintained, the rail  400  may be mounted at the door dike  150 . 
         [0047]    As illustrated in  FIGS. 2 and 3 , the moving basket  150  may move in the upward-downward direction through the embedded rail  400  in the door dike  150 . In addition, since the rail  400  is embedded in the door dike  150 , both sides of the moving basket  300  and both sides of the door dike  150  may be adjacent to each other. In addition, when the moving basket  300  is viewed from the front surface or the rear surface of the main door  100 , the entire moving basket  300  may be shown without a covered part. 
         [0048]    The structure or the shape of the rail  400  are embedded in the door dike  150 , allowing a design to be provided and a reduction of the storage space may be eliminated. The user may easily use the moving basket  300  without regard to opening and closing of the main door  100 . 
         [0049]    The main door  300  may be formed by coupling the outer door  130 , the door dike  150 , and the cap decoration parts  160  and  170 . In addition, the door frame  140  may be interposed between the outer door  130  and the door dike  150 . 
         [0050]    Rail mount units  151  may be formed at both sides of the door dike  150 , the rail  400  may be mounted at the rail mount units  151 . The rail  400  may movably support the moving basket  300  in the upward-downward direction. Thus, the rail  400  may be formed to extend in the upward-downward direction. 
         [0051]    As described above, an inner space is formed by coupling the outer door  130  for forming the front appearance of the door and the door dike  150  for forming the rear appearance of the door to each other. The inner space may be filled with a filler for insulation. 
         [0052]    Thus, the rail  400  and a rail cover bracket  500  may be disposed at the inner space. The rail  400  and the rail cover bracket  500  may be embedded in the inner space to be mounted at the door dike  150 . That is, the rail  400  may be embedded in the door dike  150  i.e. the inner space so as to support the moving basket  300 . 
         [0053]    As illustrated in  FIG. 4 , the cut-shaped rail mount units  151  may be formed at the door dike  150 . In addition, the rail may be mounted at the rail mount units  151  at the inner space. Accordingly, the entire rail  400  is substantially disposed in the door dike  150 , i.e. the space between the outer door  130  and the door dike  150 , namely, the inner space of the door. Thus, the rail  400  does not protrude from the door dike  150 . 
         [0054]    The rail cover bracket  500  may be mounted at the one side of the rail mount units. The rail cover bracket  500  may cover the side of the rail  400 . The rail cover bracket  500  may be disposed in the main door  100  to cover the rail  400 . 
         [0055]    The rail  400  may be formed to have a channel shape. In addition, a rail seating part  540  for seating the rail  400  may be formed at the rail cover bracket  500 . Thus, the rail seating part  540  may be formed to extend in the upward-downward direction. 
         [0056]    The rail  400  may be coupled to the rail cover bracket  500 . The rail  400  may be coupled to the rail cover bracket  500  by a screw  420  which passes through a coupling hole  405  of the rail and a coupling hole  510  of the rail cover bracket  500 . 
         [0057]    The rail cover bracket  500  may be formed to be wider than the rail  400  and a rail coupling unit so as to cover the rail  400  and the rail mount units  151 . 
         [0058]    When the inner space is filled with the filler, the inner space for being filled with the filler may be isolated from the inner space for accommodating the rail and the rail coupling unit. That is, penetration of the filler to the rail  400  or the rail mount units  151  may be prevented during filling the filler. 
         [0059]    The filling pressure of the filler may be high which means that coupling strength between the rail cover bracket  500  and the door dike  150  is increased by the filler. The forces acting to the rail  400  through the moving basket is applied to the rail cover bracket  500  instead of the door dike  150 . The rail cover bracket  500  is strongly coupled to the door dike  150  due to the filler. This allows the strength applied to the door dike  150  may be minimized. 
         [0060]    A lattice rib  530  may be formed at the rail cover bracket  500  to increase a coupling area between the rail cover bracket  500  and the filler. The lattice rib  530  may be formed at the part toward the inner space which is filled with the filler. The lattice rib  530  may be formed at the outer surface of the rail cover bracket  500 . 
         [0061]    A rail coupling opening  152  may be formed at the door dike  150 . The moving basket  300  is mounted at the rail  400  after the rail  400  is coupled to the door dike  150  in an integrated manner by foaming the filler. 
         [0062]    The supporter may move in the forward-rearward direction to be inserted into the rail coupling opening  152 , and the supporter may be inserted into the end of the rail to move in the upward-downward direction. 
         [0063]    The ends of two rails may be disposed at the rail coupling opening  152 . The supporter inserted through the end of an upper rail may move in the upward direction. The supporter inserted through the end of a lower rail may move in the downward direction. The end of one rail may be provided and a plurality of supporters may be inserted into the rail. Thus, a plurality of supporters as well as one support may be coupled to the rail through the rail coupling opening  152 . A plurality of the moving baskets instead of one moving basket may be mounted through the rail coupling opening  152 . 
         [0064]    The rail coupling opening  152  may be covered by a coupling cover  410  after the moving basket  300  is coupled to the rail  400 , as illustrated in  FIGS. 1 and 2 . Thus, the opening  152  is not exposed to the user. 
         [0065]    In addition, in order to separate the moving basket from the rail, the cover  410  may be separated, making it easy to mount and separate the moving basket  300 . 
         [0066]    As illustrated in  FIG. 5 , inner spaces S 1  and S 2  are formed in the door by coupling the outer door  130  and the door dike  150  to each other. These inner spaces may be filled with a foaming agent. 
         [0067]    The rail mount units  151  may be formed at the door dike  150 . The rail mount units  151  may be formed to insert the supporter  320 , which will be described later. In addition, the rail  400  is mounted at the rail mount unit  151  through the inner spaces S 1  and S 2 . The rail cover bracket  500  for covering the rail is provided in a direction of one side of the rail  400 , i.e. the inner spaces. The rail cover bracket  500  may be provided to cover the entire rail. 
         [0068]    The rail cover bracket  500  separates the inner spaces S 1  and S 2  from each other. The illustrated first inner space S 1  is a space to be filled with the foaming agent. The second inner space S 2  is not filled with the foaming agent. Thus, when the first inner space S 1  is filled with the foaming agent, the rail cover bracket  500  may be strongly coupled to the door dike  150  in the door. In addition, since the rail cover bracket  500  substantially covers the entire rail  400 , the rail  400  may sufficiently support load or impact transferred to the rail. 
         [0069]    Each rail mount unit  151  may be formed at a protrusion of the door dike  150  inserted into the storage compartment. In addition, a gasket mount unit  155  may be formed at the door dike  150 . 
         [0070]    As illustrated in  FIG. 7 , the moving basket  300  may include a moving frame  320 . Furthermore, the moving basket  320  may include a basket  310  coupled to the moving frame  320 . The moving basket  320  may move with the moving frame  320  in an integrated manner. In addition, the moving basket  300  may include the supporter  300  for supporting the moving basket  300  to the rail  400 . 
         [0071]    The supporter  300  may support the moving basket  300  and allow the moving basket  300  to move along the rail in the upward-downward direction. 
         [0072]    As illustrated in  FIG. 8 , the moving frame  320  is a configuration for substantially supporting the load. Thus, the moving frame  320  may be provided to have a shelf shape, thereby constituting a moving shelf In addition, the moving basket may be formed by coupling the basket  310  to the moving frame  320 . 
         [0073]    The moving frame  320  and the basket  310  may be separately formed to be coupled to each other. This is because the basket  310  formed of a plastic is vulnerable to bending load. As such, the moving frame  320  and the basket  310  may be separately formed such that the moving frame  320  may cope with the load or the bending load. 
         [0074]    The moving frame  320  may be formed to have a square closed loop. The moving frame  320  may be formed to evenly support the basket in every direction. Of course, the moving frame  320  may have high strength due to the above shape. Particularly, the moving frame  320  may be formed by aluminum die-casting thereby being strong. 
         [0075]    The supporter  330  may include a supporter frame  331  having a plurality of rollers  332  disposed at upper and lower parts of the supporter frame  331 . Furthermore, an extending frame  322  coupled to the supporter frame  331  may be formed at the moving frame  320 . The rollers  322  may be configured to be inserted into the rail  400 . In addition, the rollers  322  may be configured to easily move at the rail in the upward-downward direction. 
         [0076]    A locating protrusion  324  and a coupling hole  323  may be formed at the extending frame  322 . In addition, a groove  333 , into which the locating protrusion  324  is inserted, and a coupling hole  334  corresponding to the coupling hole  323  may be formed at the supporter frame  311 . A screw  335  may be provided to pass through the coupling holes  323  and  334 . Thus, the supporter frame  331  may be strongly coupled to the moving frame  320  through the extending frame  322 . 
         [0077]    An insertion groove  311 , into which the extending frame  322  is inserted, may be formed at the basket  310 . In addition, an opening  312  for operating an operation unit, which will be described later, may be formed at the insertion groove  311 . 
         [0078]    Insertion grooves  311  may be formed at both left and right sides of the basket  310 . A support point for supporting the basket may be formed at the sides of the basket instead of the front or rear ends of the basket. 
         [0079]    A division bar  316  for dividing the inner spaces of the basket may be formed at the basket  310 . The division bar  316  may be disposed in a horizontal direction in order to divide the inner spaces. If the division is not needed, the division bar  316  may be disposed in the basket in a vertical direction. In some examples, the division bar  316  may be rotatably mounted at the basket  310 . 
         [0080]    In detail, the division bar  316  may be formed to have a rod shape. The division bar  316  may include a horizontal rod  316   a  and vertical rods  316   b  disposed at both sides of the horizontal rod  316   a.  The division bar  316  may include mounting rods  316   c  extending from the ends of the vertical rods  316   b  outward. The mounting rods  316   c  are rotatably coupled to division bar supporters  315  that pass within through holes  313  formed at the basket. Washers  317  may be disposed between the division bar supporters  315  and the through holes  313 . 
         [0081]    A plurality of slots  315   a  may be formed at each of the division bar supporters  315 . The vertical rods  316   b  may be inserted into the slots  315   a  to be fixed based on rotation of the mounting rods  316   c.  Since the slots  315   a  are formed in a circumferential direction, when each of the vertical rods  316   b  is inserted into a certain slot, the vertical rod  316   b  may be fixed at a certain angle. This means the angle of the horizontal rod  316   a  may be varied and then the horizontal rod  316   a  may be fixed. 
         [0082]    The supporter  330  may include configurations for moving the moving basket in the upward-downward direction. 
         [0083]    As illustrated in  FIG. 8 , the supporter  330  includes a lever  337 . The lever  337  may function as a stopper for stopping the supporter  330 . 
         [0084]    The supporter  330  may include the operation unit  342  in which a user operates the movement of the moving basket  330 . When the user operates the operation unit  342 , displacement may occur at the operation unit. The displacement may be converted into displacement of the lever  337 . The lever  337  and the operation unit  324  may be rotatably disposed at the moving frame  320 . 
         [0085]    In detail, the operation unit  324  includes a protrusion  344  disposed at the rear side of a rotation center  342 . The rotation center  342  may be formed to have a hole shape to be coupled to a screw  339  through a bushing  340 . 
         [0086]    When a user presses a button  324   a  of the operation unit  324 , the protrusion  344  generates rotational displacement. The rotational displacement is converted into rotational displacement of the lever  337 . 
         [0087]    The lever  337  may be coupled to the screw  339  through the bushing  340 , and the lever  337  may be rotatably disposed at the moving frame  320 . 
         [0088]    As the protrusion  334  rotates to move in the downward direction, the lever  337  rotates about the rotation center  337   a.  That is, the protrusion  344  presses a protrusion  337   b  formed at the lever  337  to rotate the lever  337 . 
         [0089]    The moving basket may be fixed or move based on the rotation of the lever  337 , which will be described later. 
         [0090]    A spring  338  may be provided between the operation unit  324  and the lever  337 . When a user operates the operation unit  324 , the spring  338  is elastically deformed. The spring  338  is elastically restored when operation of the user is terminated. This is because displacement of the operation unit  324  generates displacement of the lever  337  and elastic deformation of the spring. The elastic restoration of the spring returns the operation unit and the lever to original positions thereof. 
         [0091]    The operation unit  324  and the button  324   a  are disposed at the lower part of the moving frame  320 . That is, the operation unit  324  and the button  324   a  do not protrude from the front or rear side of the moving frame  320  or the basket  310 . The operation unit  324  and the button  324   a  may be formed to have a hidden type. 
         [0092]    A rotation center  343  of the operation unit  324 , a rotation center  337   a  of the lever  337 , and a supporter cover  336  for accommodating the spring  337  may be provided. The supporter cover  336  may be fixed at the lower part of the moving frame  320  through a screw  341 . Accordingly, configurations, in which displacement is generated, may be protected by the supporter cover  336 . In addition, restrictions on the configurations, in which the displacement is generated, due to external interference may be prevented in advance. 
         [0093]    As illustrated in  FIGS. 9 and 10 , a roller guide  402  may be long formed at the rail  400  in the upward-downward direction. The roller  332  may move up and down along the roller guide  402 . 
         [0094]    A plurality of roller openings  406  may be formed at one side of the roller guide  402 . The roller openings  406  may be formed to be spaced away a certain distance from one another in the upward-downward direction. 
         [0095]    The roller  332  is configured to be rolled about a roller rotation axis  332   a  as a rotation center. In addition, the outer part of the roller may be formed of an elastic material. For the example illustrated in  FIG. 10 , the roller  332  may be inserted into the roller openings  406 . Thus, when the supporter  320  is fixed, the roller  332  may support bending load. 
         [0096]    In addition, when the roller  332  is separated from the roller openings  406  to move in the upward-downward direction, the roller  332  may be elastically deformed. The roller  332  may be elastically restored when the roller  332  approaches the roller openings  406 , and the roller  332  may be inserted into the roller openings  406 , again. 
         [0097]    As illustrated in  FIGS. 9 and 10 , the lever  337 , in the same manner of the roller  332 , may be movably disposed at the roller guide  402 . When the lever  337  is inserted into the roller openings  406 , the supporter  320  is fixed at the rail  400 , and the moving basket  300  is fixed. In addition, when the lever  337  is separated from the roller openings  406 , the moving basket  300  may move. 
         [0098]    When a user presses a button  342   a  illustrated in  FIG. 9 , the protrusion  344  illustrated in  FIG. 10  moves in the downward direction to rotate the lever  337 . The lever  337  rotates in a counterclockwise direction to be separated from the roller opening  406 . 
         [0099]    When the user continues pressing the button  342   a,  the lever  337  is maintained in a separated state from the roller opening  406 . Then, while the user presses the button  342   a,  the moving frame  302  may move up and down. 
         [0100]    In addition, the lever  337  intends to continuously be restored by the spring. Accordingly, unless the user presses the button  342   a  at the neighborhood of a certain roller opening  406 , the lever  337  is inserted into the certain roller opening  406 . A position of the moving basket  300  may be fixed, again. 
         [0101]    An inclined protrusion  337   a  and a step  337   a  may be provided at the lever  337  such that the lever  337  is easily inserted into or separated from the roller opening  406 . The step  337   a  may be formed to support the lever  337  through the roller opening  406  and to limit an insertion length of the lever  337 . 
         [0102]    As illustrated in  FIG. 9 , a rail opening  401  may be formed at the rail  400 . The rail opening  401  may be disposed to be substantially coplanar with the door dike  150 . The supporter  320  may be inserted into the rail  400  by the rail opening  401 . 
         [0103]    Rail flanges  403  may be formed at both sides of the rail opening  401  to prevent damage of the rail opening  401 . In addition, support flanges  404  may be formed at the rear side of the rail flanges  403 . The support flanges  403  may be disposed to be contact with the inside of the door dike  150  at the inner space. As such, the coupling strength between the rail  400  and the door dike  150  may be improved. 
         [0104]    It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.