Patent Publication Number: US-10767920-B1

Title: Refrigerator

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     The present application claims priority to Korean Patent Application No. 10-2019-0084448, filed in Korea on Jul. 12, 2019, the entire contents of which is incorporated herein for all purposes by this reference. 
     BACKGROUND 
     1. Field 
     The present disclosure generally relates to a refrigerator. 
     2. Background 
     A refrigerator is an appliance that includes a cabinet defining an interior storage chamber that is maintained at a relatively cool temperature. For example, the refrigerator may generate cold air to cool the storage chamber by circulation of a refrigerant according to a refrigeration cycle. 
     The refrigerator may include various types of mechanisms that provide access to the storage chamber via an opening in the cabinet and that seal the opening. For example, the refrigerator may include a swinging door and/or a sliding drawer. A hybrid-type refrigerator may include both a door and a drawer. The hybrid-type refrigerator may include, for example, at least one swinging door positioned at an upper portion of the cabinet and a drawer positioned at a lower portion of the cabinet. 
     The drawer may include a front panel and a storage bin. The front panel may form a portion of a front surface of the refrigerator and may provide a handling surface to receive a user-applied force to slide the drawer in or out of an interior of the cabinet. The storage bin may be provided at a rear of the front panel to be selectively inserted into or removed from the interior of the cabinet based on the user-applied force. Accessing the drawer provided at the lower part of the cabinet to insert or remove stored items may be inconvenient to a user. 
     Various structures have been developed to provide a drawer that can be moved upward and downward. For example, U.S. Pat. No. 9,377,238 describes a refrigerator having a lifting mechanism in a storage chamber to move a bin upward or downward, and Korean Patent Application Publication No. 10-2019-0081331 describes a refrigerator having a raising/lowering device. However, these lifting mechanisms for moving a bin upward or downward may have a structure that is positioned outside or exposed to the outside of the bin, so the lifting mechanism may have an undesirable appearance and may have safety concerns. In addition, while the refrigerator in Korean Patent Application Publication No. 10-2019-0081331 may include a drawer cover partitioning a storage space therein, the drawer cover partitioning the storage space may be difficult to assemble, and after assembling, the storage space may not be used efficiently because of difficulties related to separation of the drawer cover. 
     The above references are incorporated by reference herein where appropriate for appropriate teachings of additional or alternative details, features and/or technical background. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements, and wherein: 
         FIG. 1  is a perspective view illustrating configuration of an exemplary the refrigerator according to an embodiment of the present disclosure; 
         FIG. 2  is a sectional view of the refrigerator illustrating a state of a container moved upward by a raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 3  is a partial sectional view illustrating a state of a lower drawer moved forward according to an embodiment of the present disclosure; 
         FIG. 4  is a partial sectional view illustrating a state of the container moved upward by the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 5  is an exploded perspective view illustrating components of a storage bin of the lower drawer according to an embodiment of the present disclosure; 
         FIG. 6  is a perspective view illustrating configuration of the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 7  is a front view illustrating the configuration of the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 8  is a right side view illustrating the configuration of the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 9  is a perspective view illustrating configuration of a state of the raising/lowering device from which a support plate is removed according to an embodiment of the present disclosure; 
         FIG. 10  is a right side sectional view illustrating the configuration of the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 11  is a perspective view illustrating configuration of a driving device according to an embodiment of the present disclosure; 
         FIG. 12  is a rear perspective view illustrating the configuration of each of the driving device and the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 13  is a front perspective view illustrating the configuration of each of the driving device and the raising/lowering device according to an embodiment of the present disclosure; 
         FIG. 14  is a perspective view illustrating a state of the raising/lowering device folded according to an embodiment of the present disclosure; 
         FIG. 15  is a sectional view illustrating a state of the raising/lowering device mounted in the storage bin according to an embodiment of the present disclosure; 
         FIG. 16  is a sectional view illustrating a state of the raising/lowering device lifted upward while being mounted in the storage bin according to an embodiment of the present disclosure; 
         FIG. 17  is an exploded-perspective view illustrating configuration of an inner cover separated from the storage bin according to an embodiment of the present disclosure; 
         FIG. 18  is a perspective view illustrating detailed configuration of a main member according to an embodiment of the present disclosure; 
         FIG. 19  is a right side sectional view illustrating the inner cover according to an embodiment of the present disclosure; 
         FIG. 20  is a partial sectional view illustrating a state of the inner cover separated into a front surface cover and upper surface cover according to an embodiment of the present disclosure; 
         FIG. 21  is an exploded sectional view illustrating detailed configuration of each of the front surface cover and the upper surface cover according to an embodiment of the present disclosure; 
         FIG. 22  is a partial sectional view illustrating a state of an upper end of the inner cover fastened to an upper end of the storage bin according to an embodiment of the present disclosure; 
         FIG. 23  is an enlarged sectional view illustrating a state of a lower end of the inner cover mounted to a bottom surface of the storage bin according to an embodiment of the present disclosure; 
         FIG. 24  is a side view illustrating inner configuration of the storage bin in which the inner cover according to an embodiment of the present disclosure is in a folded state; 
         FIG. 25  is a partial cut sectional view illustrating an installation state of each of the front surface cover and a bump according to an embodiment of the present disclosure; 
         FIG. 26  is a side view illustrating the inner cover according to an embodiment of the present disclosure is close to a rear surface of the storage bin while being folded; 
         FIG. 27  is a partial side sectional view illustrating rear end configuration of the storage bin and the upper surface cover according to an embodiment of the present disclosure; 
         FIG. 28  is a partial side sectional view illustrating a rear end of the upper surface cover according to an embodiment of the present disclosure before being fastened to a rear end of the storage bin; and 
         FIG. 29  is a partial side sectional view illustrating the rear end of the upper surface cover according to an embodiment of the present disclosure after being fastened to the rear end of the storage bin. 
     
    
    
     DETAILED DESCRIPTION 
     As illustrated in  FIGS. 1 and 2 , the refrigerator  1  may be formed to have a particular volume as a hexahedron and may include a storage chamber for storing food or other items therein. For example, as an appearance of the refrigerator  1 , the refrigerator may include a cabinet  10  having a space including the storage chamber therein and an open surface thereof (e.g., a front thereof); and at least one door  20  covering the open surface (the front) of the cabinet  10 . A cooling device may be included in the refrigerator  1  to cool the storage chamber. Referring to  FIG. 1 , the cabinet  10  of the refrigerator  1  may be configured such that the front thereof may be open, and the door  20  covers the front of the cabinet  10 . 
     An inner part of the cabinet  10  may be partitioned into multiple spaces. For example, a space of the storage chamber provided in the cabinet  10  may be divided by at least one inner wall  30 . For example, the space may be divided into upper and lower spaces by the parallel inner wall  30 . For example, the cabinet  10  may include an upper space  32  on an upper side thereof and a lower space  34  provided on a lower side thereof relative to the inner wall  30 . For example, the upper space  32  may be used as a refrigerating compartment and the lower space  34  may be used as a freezer compartment. 
     In other examples, a role of the upper space  32  and a role of the lower space  34  may be exchanged, both of the upper space  32  and the lower space  34  may be used as a refrigerating compartment, or both of the upper space  32  and the lower space  34  may be used as a freezer. For example, the upper space  32  and the lower space  34  may be designed to be used as a one of a freezer or a refrigerating compartment or for other purposes, when required. 
     The door  20  may be provided as a swinging type door or a drawer moving forward and backward. In the present disclosure, the upper space  32  may include a swinging door  22 , and the lower space  34  may include drawers  24  and  26 . 
     In addition, the lower space  34  may be divided into two inner spaces, and the two drawers  24  and  26  may be arranged horizontally in the two spaces, respectively. For example, an upper space may be covered by an upper drawer  24 , a lower space may be covered by a lower drawer  26 . In other configurations, the number of the doors may be variously changed depending on an inner space of the cabinet  10 , and the doors may be provided entirely as the swinging doors  22  or entirely as the drawers  24  and  26 . 
     The drawers  24  and  26  may be configured to be automatically moved forward or backward by an opening/closing device (or opening/closing module)  100 . In addition, such drawers  24  and  26  may further include the raising/lowering device (or lift)  200 , which will be described hereinbelow, such that the container  40  provided thereat may be automatically moved upward and downward. 
     Furthermore, a portion or all of the drawers  24  and  26  may be configured to automatically move forward and backward. For example, all of the upper drawer  24  and the lower drawer  26  may be configured to automatically move forward and backward, or the upper drawer  24  may be configured to manually move forward and backward and the lower drawer  26  may be configured to automatically move forward and backward. 
     In the present disclosure, the upper drawer  24  may be configured to manually move forward and backward, and only the lower drawer  26  may be automatically moved forward and backward by the opening/closing device  100 . The container  40  may be configured to be automatically moved upward and downward by the raising/lowering device  200 , which will be described hereinbelow. 
     The opening/closing device  100  may be provided to have a rack-pinion structure that applies a force to move the drawer  26  forward and backward (e.g., to opposite sides of  FIG. 2 ). For example, a rack  110  may be provided on a lower surface of the lower drawer  26  and the pinion  120  meshing with the rack  110  by gear engagement may be rotatably provided in a bottom surface of the refrigerator  1 . In addition, a motor  130  may be provided on a bottom surface of the refrigerator  1  and may supply a rotational force to the pinion  120 . For example, when the motor  130  generates the rotational force (e.g., by using power supplied from an external source), the pinion  120  may be rotated clockwise or counterclockwise by the rotational force of the motor  130 . For example, the lower drawer  26  combined with the rack  110  moves forward and backward (e.g., to the opposite sides of  FIG. 2 ). 
     The rack  110  may be configured to be a double rack. For example, to allow the lower drawer  26  to be sufficiently opened to the outside, the rack  110  may be configured as a double rack having at least two racks, such as a first rack that moves the lower drawer  26  a first horizontal distance, and a second rack that moves the lower drawer  26  a second horizontal distance. 
     Meanwhile, the refrigerator  1  may include a button  50  to control the lower drawer  26  such that the lower drawer  26  may be automatically opened or closed. For example, as illustrated in  FIG. 1 , the button  50  may be provided on a front surface of a lower end of the swinging door  22  in the refrigerator  1 , and the lower drawer  26  may be configured to be opened or closed by a user pressing the button. In other examples, the button  50  may be provided on a front surface of the lower drawer  26  or may be provided on various other locations, such as a front surface or side surface of the refrigerator  1 . 
     The drawer  26  may include a storage bin  27  having a containing space or receiving the container  40  therein and a front panel  28  provided at a front (a right side of  FIG. 2 ) of the storage bin  27  to be integrated therewith so as to constitute an outer front surface of the drawer  26 . In addition, the refrigerator  1  may include a machine bin  60  provided at a lower rear side thereof. Various components, such as a compressor and a condenser performing a refrigeration cycle, may be arranged in the machine bin  60 . 
     In  FIGS. 3 and 4 , the lower drawer  26  of the drawers  24  and  26  are shown as being substantially opened forward (e.g., to a left side of  FIG. 3 ). For example, as illustrated in  FIG. 3 , the lower drawer  26  may be completely opened forward but the raising/lowering device  200  does not operate yet, and as illustrated in  FIG. 4 , after the lower drawer  26  has been completely opened forward, the container  40  may be moved upward by the raising/lowering device  200 . 
     As illustrated in these drawings, the lower drawer  26  may be moved forward (to a left side of  FIGS. 3 and 4 ) by a forward moving control by the button  50 . For example, the forward movement of the lower drawer  26  may be performed by the opening/closing device  100 . Such a lower drawer  26  may be configured to not be opened and closed by a manual manipulation of a user, but instead, the lower drawer  26  may be automatically opened and closed by a manipulation of a user pressing the button  50 . For example, when a user presses the button  50 , the rotational force may be generated by the motor  130 , and the pinion  120  may be rotated counterclockwise by the rotational force. 
     For example, when the pinion  120  is rotated counterclockwise, the rack  110  meshing with the pinion  120  may be moved to the left, and an entirety of the lower drawer  26  to which the rack  110  is fixed may move to the left and may be open. In some examples, a distance which the lower drawer  26  moves to be open to the left may be a length allowing the container  40  received into the storage bin  27  to be completely exposed to the outside from the front surface of the refrigerator  1 . For example, the lower drawer  26  may be required to be sufficiently opened such that a user takes out the container  40 , or takes out or stores food in the container  40 . 
     In addition, the container  40  may be moved upward by the raising/lowering device  200  provided at a lower side of the container  40 . Even in this case, the lower drawer  26  may be required to be sufficiently opened such that the container  40  does not hit the front surface of the refrigerator  1 , for example, a lower end of a front surface of the upper drawer  24 . For example, to allow the lower drawer  26  to be sufficiently removed forward, the structure having the pinion  120  and the rack  110  may include the double rack structure. 
     Whether the lower drawer  26  may be sufficiently open may be determined by an open/close detecting mechanism (or sensor)  150 . The open/close detecting mechanism  150  detects whether the lower drawer  26  may be sufficiently open to the outside (the left side of  FIG. 3 ), and may include permanent magnets  152  and  154 , and a detection sensor  156 . 
     The permanent magnets  152  and  154  may be fixed to a left end (a front end of the lower surface of the lower drawer) of the lower surface of the lower drawer  26  and a right end thereof (a rear end thereof), respectively, and the detection sensor  156  may be fixed to a front end part of the bottom surface of the refrigerator  1 . For example, as illustrated in  FIG. 3 , the permanent magnets  152  and  154  may include a front end magnet  152  provided at the left end (the front end) of the lower surface of the lower drawer  26  and a rear end magnet  154  provided at the right end (the rear end) of the lower drawer  26 . For example, when the front end magnet  152  is brought close to (e.g., within a threshold distance of) the detection sensor  156 , the lower drawer  26  may be recognized to be closed and when the rear end magnet  154  may be brought close to (e.g., within a threshold distance of) the detection sensor  156 , the lower drawer  26  may be recognized to be opened. The detection sensor  156  may be various sensors, such as a hall sensor or a lead switch. 
     The components of the open/close detecting mechanism  150  may be installed at other positions than the above-described positions. For example, the permanent magnets  152  and  154  may be installed at the bottom surface of the refrigerator  1  and the detection sensor  156  may be installed at the lower drawer  26 . 
     The container  40  of a shape of a rectangular container having an open upper part may be received in an inner space of the storage bin  27  and the container  40  may be configured to be moved upward and downward by the raising/lowering device  200 . For example, the raising/lowering device  200  may be configured to be installed under the container  40  so as to support the container  40 . 
     A rear side of the inner space of the storage bin  27  (e.g., right sides of  FIGS. 3 and 4 ) may be covered by an inner cover  300 . As illustrated in  FIGS. 3 and 4 , the inner cover  300  may be installed to have a section of an “L” shape as a whole and may cover the remaining rear end space of the inner space of the storage bin  27  except for a space corresponding to an occupying space of the container  40  in the inner space thereof. For example, the rear end space in the storage bin  27  may be covered by the inner cover  300 , whereby a neat appearance may be provided to a user and a hand of the user may be prevented from being trapped therein. 
     As illustrated in  FIG. 3 , when the forward movement of the lower drawer  26  may be completed, then the raising/lowering device  200  operates and the container  40  may be moved upward. For example, the raising/lowering device  200  positioned under the container  40  operates and the container  40  may be lifted to an upper side of the storage bin  27 . For example, in  FIG. 4 , a state of the container  40  completely moved upward by the raising/lowering device may be illustrated. 
     A driving device  400  may be provided in the front panel  28  of the lower drawer  26  and controls operation of the raising/lowering device  200 . For example, a vertical height of the raising/lowering device  200  may be changed such that a distance between an upper surface and a lower surface of the raising/lowering device increases or decreases. For example, the raising/lowering device  200  moves the container  40  at an upper side thereof upward and downward, and the operation of the raising/lowering device  200  may be controlled by the driving device  400 . 
     The raising/lowering device  200  may be configured to be folded or unfolded in an upper end and lower end thereof, and when the raising/lowering device may be not used, volume thereof may be minimized, so the raising/lowering device  200  may be received in the storage bin  27 . For example, the raising/lowering device  200  may be configured to have a scissor type link structure in which the height of the raising/lowering device  200  may be minimized during the folding of the raising/lowering device  200  and the height of the raising/lowering device  200  may be maximized during the unfolding of the raising/lowering device  200 . When a folded state of the raising/lowering device  200  is detected while the lower drawer  26  is completely removed and the raising/lowering device  200  is also completely lowered, the driving device  400  may operate and allow the raising/lowering device  200  to unfold. 
     In some examples, an additional raising/lowering detection mechanism (or raising/lowering sensor) may be provided in the front panel  28 , in the driving device  400 , or in an area adjacent thereto and detects whether the raising/lowering device  200  may be folded or unfolded. In other examples, due to the upward or downward moving position of the container  40  detected, the folding or unfolding of the raising/lowering device  200  may also be determined. 
     In  FIG. 5 , an exploded perspective view of components provided in the storage bin  27  is illustrated. As illustrated in  FIG. 5 , the storage bin  27  may be configured to have the containing space of a particular size therein so as to form an outer surface thereof. The storage bin  27  may include the raising/lowering device  200  therein such that the container  40  or food may be moved upward and downward. 
     In addition, the inner cover  300  may be provided in the storage bin  27  so as to cover the rear end part of the inner part of the storage bin  27  and to partition the inner space of the storage bin  27 . The storage bin  27  may be formed of plastic materials by injection molding to have an entire shape thereof. The storage bin  27  may have a shape of a basket having an open upper surface to have a space therein to allow food to be stored. A rear surface of the storage bin  27  may be configured to be an inclined surface and the storage bin  27  may be prevented from being interfered with by the machine bin  60  provided at the lower rear side of the refrigerator  1 . 
     An outer side plate  27   a  may be provided on each of opposite surfaces of outer sides of the storage bin  27 . The outer side plate  27   a  may be installed on each of the opposite surfaces of the storage bin  27  to constitute outer surfaces thereof. Furthermore, the outer side plate  27   a  also functions such that components such as a door frame mounted to each of opposite sides of a drawer body  38  and the rack  110  constituting the opening/closing device  100  may be not exposed to the outside. 
     The inner cover (or first cover)  300  may be provided to divide the inner part of the storage bin  27  into a front space and a rear space. For example, the inner cover  300  may cover the rear space of the inner space of the storage bin  27  so as to allow only the inner space of a front of the storage bin to be exposed to the outside. For example, in the inner part of the storage bin  27 , only the front space at which the raising/lowering device  200  may be arranged may be exposed to the outside and the rear space may be covered by the inner cover  300 . 
     The inner cover  300  may include a front surface cover (or a front cover wall)  310  and an upper surface cover (or upper cover wall)  320 . The front surface cover  310  may be formed in a step shape and may partition an inner space of the storage bin  27  into a front space and a rear space. The upper surface cover  320  may be rotatably connected to an upper end of the front surface cover  310  and covers a rear upper surface of the front surface cover  310 . For example, as illustrated in the drawings, the inner cover  300  may include the front surface cover  310  forming a vertical surface and the upper surface cover  320  formed horizontally by extending and rearward from the upper end of the front surface cover  310 . In addition, the upper surface cover  320  may be connected to the upper end of the front surface cover  310  to be rotatable. 
     In addition, the front surface cover  310  may include an upper end portion (or upper end wall)  312 , a step surface  314 , and a lower end portion (or lower end wall)  316 . The upper end portion  312  may be provided on the upper end of the front surface cover  310  to allow the upper surface cover  320  to be rotatably connected thereto, the step surface  314  may be formed by being bent perpendicularly forward from a lower end of the upper end portion  312  and extending, and the lower end portion  316  may be formed by being bent perpendicularly downward from an end of the step surface  314  and extending. For example, the front surface cover  310  may have the step shape lower end portion, and the step shape portion may prevent a user&#39;s finger from being inserted into a lower side of the drawer through a gap between the raising/lowering device  200  and the front surface cover  310 . 
     An outer surface of the inner cover  300  may be made of a metal material as the outer side plate  27   a . This construction may allow a user to feel the texture of metal and create aesthetic qualities and have rigidity since the inner cover  300  may be a part seen during the forward movement of the lower drawer  26  by the user. 
     A front surface and side surfaces of the storage bin  27  may also be made of a metal material. For example, when each part of the storage bin  27  may be made of the metal material, inner sides of the containing space of the storage bin  27  may entirely have the feel of metal, food stored therein may be stored to be entirely and evenly cold, and visually aesthetic qualities may be created for a user. 
     The raising/lowering device  200  may sit in the inner part of the storage bin  27 . The raising/lowering device  200  has a structure of being vertically moved upward and downward by the driving device  400  connected thereto, which will be described, and, opposite sides of the raising/lowering device move upward and downward at the same rate 
     To combine the raising/lowering device  200  with the driving device  400 , a connection hole  27   b  may be provided at each of lower opposite sides of the front surface of the storage bin  27  by being formed therethrough in a front to rear direction of the front surface. The connection hole  27   b  may be a part into which the scissor side connection part  250  provided at the front end of the raising/lowering device  200  may be inserted to be received therein. For example, a radius of the connection hole  27   b  may be configured to be the same as or larger than a radius of the scissor side connection part  250 . 
     In  FIGS. 6 to 10 , the configuration of the raising/lowering device  200  may be illustrated. For example, as illustrated in the drawings, the raising/lowering device  200 , which may be configured to be a scissor type, may be folded when the raising/lowering device may be lowered and may be unfolded when the raising/lowering device may be raised such that the container  40  or food seated on the upper surface thereof may be moved upward and downward. 
     In addition, the raising/lowering device  200  may further include the support plate  210  thereon. For example, as illustrated in the accompanying drawings, the support plate  210  may be further provided on an upper end of the raising/lowering device  200  to allow the container  40  laid on an upper side thereof to be efficiently seated. 
     The support plate  210 , which constitutes an outer surface of the upper surface of the raising/lowering device  200 , may be configured to have a particular thickness and may be made of a metal such as a stainless material to be aesthetic, and may be configured such that an inner part of the support plate may be depressed so as to allow the container  40  to be efficiently seated and fixed. The raising/lowering device  200  may be provided on an inner bottom of the storage bin  27  and may be removably provided at an inner side of the storage bin  27 . 
     The raising/lowering device  200  may include the upper frame  220  provided at the upper side thereof, a lower frame  230  provided under the upper frame  220 , and a pair of scissor assemblies  240  arranged between the upper frame  220  and the lower frame  230 . As illustrated in the drawings, the upper frame  220  may be configured to have a rectangular frame shape, and the support plate  210  sits on and may be fixed to an upper surface of the upper frame  220 . 
     The upper frame  220  of the raising/lowering device  200  moves in upward and downward directions and substantially supports food or the container  40  together with the support plate  210 . The upper frame  220  may be configured to have a metal plate shape, and edges thereof may be partially bent downward. For example, the upper frame  220  may be configured to define a space to house each of the scissor assemblies  240  in cooperation with the lower frame  230 . 
     The lower frame  230  may be provided under the upper frame  220  and sits on a bottom surface of the storage bin  27 . Furthermore, the lower frame  230  may be configured to have a shape corresponding to a shape of the upper frame  220 . The lower frame  230  may also be configured to have a metal plate shape as the upper frame  220 , and edges thereof may be bent upward. For example, the lower frame  230  may be configured to define the space to house each of the scissor assemblies  240  together with the upper frame  220 . 
     The raising/lowering device  200  may be configured to be unfolded or folded upward and downward by the scissor assemblies  240 . For example, to allow the raising/lowering device  200  to be folded, a locking mechanism  500  may be used. The locking mechanism  500  may allow the lower frame  230  and the upper frame  220  to be brought close to each other to vertically fold the raising/lowering device  200  such that a vertical length of the locking mechanism  500  may be minimized. For example, the locking mechanism  500  may include the upper locking mechanism  510  provided in the upper frame  220  and the lower locking mechanism  520  provided in the lower frame  230 . 
     For example, the lower locking mechanism  520  may be provided at a middle of the lower frame  230 . The lower locking mechanism  520  functions to allow the upper frame  220  and the lower frame  230  to be not randomly separated from each other and to be in a state of restricting each other when the raising/lowering device  200  may be removed from the storage bin. For example, the lower locking mechanism  520  allows the scissor assemblies  240  to maintain the folded state thereof without unfolding. 
     The lower locking mechanism  520  may include a locking casing  522  fixed to the middle of the lower frame  230 , a lower hook  530  moving in the locking casing  522 , and a force applying member (or spring)  524  applying a unidirectional force to the lower hook  530 . For example, the lower locking mechanism  520  may be provided at the middle of an upper surface of the lower frame  230  by protruding upward therefrom. In addition, as illustrated in  FIG. 10 , the locking casing  522  may be configured to have a particular front to rear length (to opposite sides of  FIG. 10 ) and a hook space  526  having volume of a particular size may be provided in the locking casing  522 . 
     The lower hook  530  may include a hook body  532  having a particular vertical height, a support end  534  provided at a lower end of the hook body  532  to support the hook body  532 , and a hook end  536  protruding by extending forward from an upper end of the hook body  532 . The hook body  532  may be configured to have the particular vertical height and a hook hole  532   a  may be provided in an upper surface of the locking casing  522  by being vertically formed therethrough. For example, the hook hole  532   a  having a particular front to rear length may be provided in the upper surface of the locking casing  522  by being vertically formed therethrough, and the hook body  532  may be arranged by vertically passing through the hook hole  532   a.    
     The hook body  532  may be configured such that an inner part thereof may be hollow and a lower part thereof may be open. For example, the inner part of the hook body  532  may be hollow and the lower part thereof may be open to have a protrusion groove  532   b . A spacing protrusion  27   c , which will be describe hereinbelow, may be received in the protrusion groove  532   b . For example, a front to rear thickness of the hook body  532  may be configured to gradually decrease toward the upper end of the hook body. As illustrated in  FIG. 10 , at least a rear surface (e.g., a right surface of the hook body of  FIG. 10 ) of the hook body  532  may be configured to be gradually inclined so as to be positioned at a further rear side toward a lower side thereof. 
     The front to rear length of the hook hole  532   a  may be configured to have a size larger than a size of the thickness of the hook body  532  provided to pass through the hook hole  532   a . For example, the hook body  532  may be allowed to move a particular distance forward and backward while the hook body  532  may be received in the hook hole  532   a.    
     As illustrated in  FIG. 10 , the support end  534  may be configured to extend forward and backward (to opposite sides of  FIG. 10 ) at a lower end of the hook body  532  and vertically extend therefrom and may be a part moving forward and backward (to the opposite sides of  FIG. 10 ) in the locking casing  522 . 
     The hook end  536  may be provided to protrude by a particular portion by perpendicularly bending to a front (a left side of  FIG. 10 ) of the hook body  532  from the upper end thereof and has a shape corresponding to a shape of an upper hook end  514  of the upper locking mechanism  510 , which will be described hereinbelow. 
     The force applying member  524  may be provided in the locking casing  522  and functions to pull the lower hook  530  forward (to the left side of  FIG. 10 ). For example, the force applying member  524  may be configured as a tension spring and functions to pull the lower hook  530  forward by tensile elasticity. A front of the force applying member  524  may be connected to a front surface of an inner side of the locking casing  522  and a rear end of the force applying member may be connected to a front end of the support end  534 . 
     In other examples, the force applying member  524  may be made of various materials such that the force applying member continues to perform a function of pushing or pulling the lower hook  530  forward by the elasticity. For example, the force applying member  524  may be provided as an elastic spring and installed at a rear side of the support end  534  to push the lower hook  530  forward by an elastic force. 
     The upper frame  220  may include the upper locking mechanism  510  provided on a middle portion of a lower surface of the upper frame  220 . As illustrated in the accompanying drawings, the upper locking mechanism  510  may be provided by protruding downward from the lower surface of the upper frame  220  and has a shape corresponding to a shape of the lower hook  530  such that the upper locking mechanism and the lower hook may be engaged with each other. For example, a lower end of the upper locking mechanism  510  may be bent perpendicularly rearward (to the right side of  FIG. 10 ), thereby being held by the hook end  536  of the lower hook  530 . 
     The raising/lowering device  200  may be required to freely fold and unfold, but when the raising/lowering device  200  may be removed upward from the storage bin, the raising/lowering device  200  may be required to maintain the folded state thereof. For example, the raising/lowering device  200  may be required to unfold when the container  40  sits on an upper side of the raising/lowering device  200  to be moved upward and downward. However, when the raising/lowering device  200  may be removed to the outside since the raising/lowering device may be not used, the raising/lowering device  200  may be required to be removed upward with the raising/lowering device folded. 
     For example, the anti-loosening device may be further provided to allow the raising/lowering device  200  to be rotated relative to the front end thereof such that the folded state of the raising/lowering device  200  may be maintained when the raising/lowering device  200  may be moved upward and removed from the storage bin. 
     The anti-loosening device may include the locking mechanism  500  that prevents the raising/lowering device  200  from unfolding and a handle  215 , which will be described hereinbelow. For example, apart from the locking mechanism  500 , the handle  215  configured to be held by a user may be provided at each of rear end parts of opposite side edges of the raising/lowering device  200  so as to allow the raising/lowering device  200  to be rotated relative to the front end thereof. 
     For example, when a user holds and lifts the handle  215  provided at the rear end part of the raising/lowering device  200 , the raising/lowering device  200  may be naturally rotated relative to the front end thereof. For example, the lower locking mechanism  520  escapes from the spacing protrusion  27   c , which will be described hereinbelow, and the folded state of the raising/lowering device  200  may be maintained by the locking mechanism  500 . 
     The scissor assemblies  240  may be provided at opposite sides of the upper frame  220  and the lower frame  230  relative to a middle of each of the upper frame and the lower frame. In some examples, each of the scissor assembly  240  may be axially coupled to the upper frame  220  and the lower frame  230 . For example, the upper frame  220  may move upward and downward according to the movement of the scissor assembly  240 . 
     Each of the pair of scissor assemblies  240  provided at the opposite sides may be different only in an installation position and may be exactly the same in a structure and shape thereof. For example, as illustrated in the accompanying drawings, the distance between the upper frame  220  and the lower frame  230  may be decreased or increased by the movement of the scissor assembly  240  having an “X” shape as a whole at each of the opposite sides. 
     The scissor assembly  240  may include a plate-shaped plate unit (or plate)  242  and a rod unit  244  (or rod) axially coupled to intersect with the plate unit  242 . In some examples, the plate unit  242  may be rotatably mounted to the lower frame  230 . For example, the plate unit  242  may be rotatably installed at each of opposite ends of the lower frame  230 . The rod unit  244  may be rotatably connected to the upper frame  220 . For example, the rod unit  244  may be rotatably installed at each of opposite ends of the upper frame  220 . 
     The plate unit  242  may be configured to be a rectangular plate shape and be made of aluminum alloy materials. For example, the plate unit may be formed to have high rigidity and be light, and may also be formed by die casting. The plate unit  242  may include the scissor side connection part  250  provided at a lower end thereof by protruding therefrom. For example, the scissor side connection part  250  may be provided at a front end of the plate unit  242  by further protruding forward to be integrated with the plate unit. 
     The rod unit  244  may be installed to intersect the plate unit  242 . For example, the rod unit  244  and the plate unit  242  unfold to have an “X” shape (as viewed from a front thereof) by intersecting each other, and an intersecting shaft  246  may be provided at a center portion at which the rod unit  244  and the plate unit  242  intersect each other such that the rod unit  244  and the plate unit  242  rotatably intersect each other. 
     Ends of the rod unit  244  and the plate unit  242  may be in contact with the lower surface of the upper frame  220  and the upper surface of the lower frame  230  and accordingly, the rod unit  244  and the plate unit  242  may be configured to slidably move. For example, a lower end (in  FIG. 6 ) of the plate unit  242  may be rotatably mounted to the lower frame  230  and an upper end of the plate unit  242  may be installed on the lower surface of the upper frame  220  to slidably move. For example, an upper moving guide  252  may be provided on the lower surface of the upper frame  220  to have a particular length to opposite sides thereof and may be in contact with the upper end of the plate unit  242  to guide the plate unit such that the plate unit slidably moves. In some examples, a roller rotating along the upper moving guide  252  may be further provided at the upper end of the plate unit  242 . 
     An upper end (in  FIG. 6 ) of the rod unit  244  may be rotatably mounted to each of the opposite ends of the upper frame  220 , and a lower end of the rod unit  244  may be slidably installed on the upper surface of the lower frame  230 . For example, a lower moving guide  254  may be installed on the upper surface of the lower frame  230  to have a particular length to opposite sides thereof and may be in contact with the lower end of the rod unit  244  so as to guide a sliding movement of the rod unit. A roller rotating along the lower moving guide  254  may be further provided at the lower end of the rod unit  244 . 
     A rear end hook  260  having a hook shape may be further provided at a rear end (a right end of  FIGS. 8 and 10 ) of the lower frame  230  by extending backward, and a second cover that includes a cover piece (or cover ledge)  270  may be provided at a rear end of the support plate  210  by extending backward therefrom to prevent a user&#39;s finger being trapped. The rear end hook  260  may be held by a lower end of the inner cover  300  and the cover piece  270  covers a gap between the raising/lowering device  200  and the inner cover  300 . In addition, the handle  215 , which will be described hereinbelow, may be provided at each of rear end parts of the opposite side edges of the support plate  210 . 
     As illustrated in  FIGS. 11-13 , a driving device  400  may be arranged in the front panel  28  and may be connected to the raising/lowering device  200  provided at a rear side thereof. For example, power generated by the driving device  400  may be transmitted to the raising/lowering device  200 . The driving device  400  may transmit power simultaneously to the opposite sides of the raising/lowering device  200 . For example, the raising/lowering device  200  may move upward and downward in parallel in the opposite sides thereof without slanting. 
     The driving device  400  may include a motor assembly  410 , a screw unit  420  arranged at each of opposite sides of the motor assembly  410  to have a pair of screw units, and a lever  430  connected to each of the screw units  420  to have a pair of levers. In addition, the screw unit  420  may include a screw  422  and the screw holder  424 , through which the screw  422  passes, moving upward and downward along the screw  422 . 
     A lever connection part  432  may be provided at an end of the lever  430  and the lever connection part  432  may be rotatably fixed to a rear surface of the front panel  28 . The lever connection part  432  may be combined with the scissor side connection part  250 . 
     A lever hole  434 , into which a holder engaging member  440  may be locked, may be provided in an inner end of each of the pair of the levers  430 . The lever hole  434 , which may be configured to be a longitudinal hole, guides movement of the holder engaging member  440  and at the same time allows the holder engaging member  440  to be engaged with the screw holder  424 . For example, the lever  430  may be rotated by the screw holder  424  moving upward and downward during rotation of the screw  422 . 
     The motor assembly  410  may be positioned at a middle portion of the front panel  28 . A drive motor  412  may be provided in the motor assembly  410  and the screw units  420  and the levers  430  of the opposite sides of the motor assembly  410  may be operated by the motor assembly  410  including the drive motor  412 . 
     The motor assembly  410  may allow speed reduction and a magnitude of a transmitted force to be adjusted by combination of multiple gears. In addition, the motor assembly  410  has a structure of having the drive motor  412  and the gears vertically arranged so as to minimize a recessed space of the front panel when the motor assembly  410  may be installed in the front panel  28 . For example, to minimize a thickness of the motor assembly  410 , a width of opposite side directions thereof may be configured to be wide and a thickness of forward and backward directions thereof may be configured to be minimized. 
     In addition, the drive motor  412  constituting the motor assembly  410  protrudes to the storage bin  27  so as to allow a recessed depth of the front panel  28  to be minimized such that a thermal insulation performance of the front panel may be guaranteed. The drive motor  412  provides power to the raising/lowering device  200  such that the raising/lowering device  200  may be moved upward and downward and may be configured to rotate clockwise/counterclockwise. For example, when an upward or downward moving signal of the raising/lowering device  200  may be input, the drive motor  412  rotates clockwise or counterclockwise and provides power to the raising/lowering device  200  so that the raising/lowering device may be moved upward and downward. Furthermore, the drive motor  412  may be stopped at the input of a stop signal by a load thereof or detection of a sensor. The motor assembly  410  may include the drive motor  412 , a motor casing  414  in which the drive motor  412  may be installed, and a motor cover  416  with which the motor casing  414  may be combined and covers the drive motor  412 . A rotating shaft of the drive motor  412  may protrude from the motor casing  414  toward a side opposite to a side of the motor cover  416 . 
     Furthermore, the motor assembly  410  may further may include a power transmission part (or power transmission gears) to transmit the power of the drive motor  412 . The power transmission part may be positioned at a side opposite to a side of the drive motor  412  relative to the motor casing  414 . The power transmission part may be configured by the combination of the multiple gears and may be covered by a cover member  450  mounted at a side (a front of the motor casing) opposite to the side of the drive motor  412 . 
     The power transmission part may include a drive gear  452  connected to the shaft of the drive motor  412  passing through the motor casing  414 , a first transmission gear  454  provided at a lower side of the drive gear  452  to mesh therewith, a second transmission gear  456  meshing with the first transmission gear  454 , a third transmission gear  458  meshing with the second transmission gear  456 , and a pair of cross gears  460  meshing with the third transmission gear  458 . In addition, as illustrated in  FIG. 14 , the second transmission gear  456  meshing with the first transmission gear  454  may be configured as a multi-stage gear to mesh with the upper and lower gears each other. 
     The cross gears  460  may be configured to may include spur gears and helical gears. For example, a first helical gear part may be provided at a rear of each of the cross gears  460  configured to have a spur gear shape, and the first helical gear part meshes with a second helical gear part  464  of a side of each of the cross gears. 
     A rotation center line of the second helical gear part  464  may be arranged to intersect a rotation center line of the cross gear  460 . For example, the first helical gear part and the second helical gear part  464  may be combined with each other in a state intersecting with each other and may be configured to be engaged with each other so as to allow rotations thereof to be transmitted to each other. 
     The rotation center line of the cross gear  460  extends in a front to rear direction thereof and the rotation center line of the second helical gear part  464  extends in an inclined vertical direction. Furthermore, as illustrated in  FIG. 14 , each of the rotation center lines of the second helical gear parts  464  arranged at the opposite sides of the cross gears may be arranged to be inclined in a direction gradually moving away from each other upward. 
     The screw unit  420  may be arranged at each of the opposite sides of the motor assembly  410 . The screw unit  420  may be arranged at each of the opposite sides of an inner side of the front panel  28  and each of the pair of the screw units  420  may be different only in an installation position thereof, but may be the same in a structure and shape thereof. 
     The power of the drive motor  412  may be transmitted to a lower part of the screw unit  420 . Each of the screw units  420  of the opposite sides may be configured to be symmetrical to each other relative to the motor assembly  410 . For example, the motor assembly  410  may be arranged between the screw units  420  positioned at the opposite sides, and each of the screw units  420  arranged at the opposite sides may be arranged to have a shorter distance therebetween toward a lower end thereof from an upper end thereof. 
     The screw unit  420  may include the screw  422  rotated by receiving the power of the drive motor  412 , wherein the screw  422  extends in upward and downward directions and may be configured to be inclined such that an upper end thereof faces an outside thereof and a lower end thereof faces an inside thereof. The screw  422  may be connected to the second helical gear part  464 . For example, the screw  422  rotates together with the second helical gear part  464  during rotation thereof. 
     The screw unit  420  may also further include the screw holder  424  through which the screw  422  passes to be combined therewith, wherein the screw holder  424  moves upward and downward along the screw  422  during rotation of the screw  422 . In addition, since the lever  430  may be combined with the screw holder  424 , the lever  430  rotates during movement of the screw holder  424 . For example, during the rotation of the screw  422 , the screw holder  424  moves along the screw  422 . 
     In addition, a magnet may be provided in the screw holder  424 . The magnet may be provided such that a position of the screw holder  424  may be detected and when the screw holder  424  may be positioned at a lowest end or a top end of the screw  422 , the raising/lowering detection sensor device detects this. For example, completion of an upward or downward movement of the raising/lowering device can be determined by whether the magnet installed in the screw holder  424  may be detected. The lever  430  may connect the screw holder  424  with the raising/lowering device  200  and each of opposite sides of the lever may be combined with each of the screw holder  424  and the raising/lowering device  200 . 
     The screw unit  420  may further include a housing  426  receiving the screw unit  420 . The housing  426  may include an outer surface of the screw unit  420  and may include a space in which the screw unit  420  and the screw holder  424  may be received. The housing  426  may be formed by bending a plate shaped metal material or may be formed of a plastic material. 
     The housing  426  may include at least one guide bar  428  to guide lifting of the screw holder  424 . The at least one guide bar  428  extends in parallel with the screw  422  while being spaced apart from the screw  422 . A plurality of guide bars  428  may be provided in the housing  426  such that the screw holder  424  may be not displaced to any side of a left or right side relative to the screw  422 , and the screw  422  may be positioned between the plurality of guide bars  428 . 
     The motor casing  414  and a pair of housings  426  may be provided to be integrated with each other. Furthermore, a single cover member  450  may cover the motor casing  414  and the pair of housings  426 . For example, the cover member  450  may be combined with the motor casing  414  to cover the power transmission part, and may be combined with the pair of housings  426  to cover the screw  422 , the guide bars  428 , and the screw holder  424 . Since the driving device  400  exists as a module, the driving device  400  becomes compact and thus the driving device  400  can be easily installed in the front panel  28 . 
       FIG. 14  is a perspective view of a state of the raising/lowering device folded according to the present disclosure. As illustrated in  FIG. 14 , the support plate  210  constitutes an upper outer surface of the raising/lowering device  200 . 
     In addition, the support plate  210  may be a rectangular flat plate as a whole, and each of edges thereof protrudes upward to have a particular height. For example, the upper surface of the support plate  210  may be entirely formed such that an inner part of each of the edges thereof may be depressed, so that a lower end of the container  40  may be easily seated. 
     The edges of the support plate  210  may include a front edge  212  provided by protruding upward from an upper surface of a front end thereof, side edges  214  provided by protruding upward from opposite sides thereof, and a rear edge  216  provided by protruding upward from an upper surface of a rear end thereof. 
     An upper end of the rear edge  216  may extend backward to form the cover piece  270 , and as described above, the cover piece  270  may extend over the gap between the raising/lowering device  200  and the inner cover  300  such that fingers of a user or a child may be prevented from being trapped in the gap. 
     Each of the side edges  214  further include the handle  215  at the rear end part thereof. 
     The handle  215  may be a part held by fingers of a user when the user takes out the raising/lowering device  200  from the inner part of the storage bin  27 . As illustrated in the drawings, the handle  215  may be configured to be recessed from an inner surface of each of the pair of the opposite side edges  214  to an outer side thereof. For example, a user moves his/her fingers from a middle of the upper surface of the support plate  210  to each of the pair of side edges  214 , puts his/her fingers in the recessed portion of the handle  215 , and lifts the raising/lowering device upward. For example, the raising/lowering device  200  rotates relative to the front end thereof and the rear end part thereof may be lifted upward. 
       FIG. 15  is a sectional view of a state of the raising/lowering device  200  mounted in the storage bin  27 , and  FIG. 16  is a partial sectional view illustrating a state at which the raising/lowering device  200  mounted in the storage bin  27  may be lifted upward. As illustrated in  FIG. 15 , the raising/lowering device  200  sits on the bottom surface of the inner part of the storage bin  27 . For example, the scissor side connection part  250  of the raising/lowering device  200  passes through the connection hole  27   b  of the storage bin  27  and accordingly, a front end of the scissor side connection part  250  protrudes to the front (a left side of  FIG. 15 ) of the storage bin  27 . 
     In addition, the lower hook  530  moves backward (a right side of  FIG. 15 ) and may be separated from the upper locking mechanism  510 . For example, the upper frame  220  and the lower frame  230  may be not locked to each other in the folded state. For example, the storage bin  27  may include the spacing protrusion  27   c  provided at a middle part thereof by protruding upward therefrom, and the lower hook  530  may be moved backward (the right side of  FIG. 15 ) by the spacing protrusion  27   c.    
     As illustrated in  FIG. 16 , the spacing protrusion  27   c  may be configured to have a “Δ” (triangular) shape having a pointed upper side. For example, although a front surface (a left-side surface of  FIG. 15 ) of the spacing protrusion  27   c  may be vertically configured, a rear surface thereof (a right-side surface of  FIG. 15 ) may be required to be configured slantingly. This design may be because a rear end part of the protrusion groove  532   b  of the lower hook  530  may be in a sliding contact with the rear surface of the spacing protrusion  27   c  therealong. 
     For example, the upper locking mechanism  510  and the lower hook  530  of the raising/lowering device  200  may be engaged with each other to maintain the folded state thereof outside of the storage bin  27 . For example, when the raising/lowering device  200  of the folded state may be installed on the bottom surface from an upper part of the storage bin  27 , the raising/lowering device  200  may be brought into a close contact with the bottom surface of the storage bin  27  by weight. 
     For example, the rear surface of the spacing protrusion  27   c  may be in contact with a rear end of a lower surface of the hook body  532  of the lower hook  530 . As the raising/lowering device  200  gradually lowers downward, the elasticity of the force applying member  524  configured as the tension spring does not overcome a downward moving force of the raising/lowering device  200 , and accordingly, the rear end of the lower surface of the hook body  532  of the lower hook  530  gradually slides along the rear surface of the spacing protrusion  27   c  as illustrated in  FIG. 15 . 
     The spacing protrusion  27   c  may be received in the protrusion groove  532   b  provided in the hook body  532 , and the lower hook  530  and the upper locking mechanism  510  may be spaced apart from each other and accordingly may be not engaged with each other. For example, the spacing protrusion  27   c  may be received in the protrusion groove  532   b , and the lower locking mechanism  520  and the upper locking mechanism  510  may be separated from each other such that the locking mechanism  500  may be unlocked. For example, the raising/lowering device  200  may be in a state which can be unfolded. For example, to maintain the folded state of the raising/lowering device  200 , the spacing protrusion  27   c  may be required to escape from the protrusion groove  532   b.    
     As described above, to take out the raising/lowering device  200  upward while the raising/lowering device  200  sits on the bottom surface of the storage bin  27 , the handle  215  may be lifted upward while the handle may be held by each of the hands. For example, while the raising/lowering device  200  rotates counterclockwise relative to the front end part thereof, the rear end part thereof (a right end of  FIG. 15 ) may be lifted upward. 
     When the rear end part of the raising/lowering device  200  may be moved upward, the rear end of the lower surface of the hook body  532  of the lower hook  530  gradually may be moved upward by sliding along the rear surface of the spacing protrusion  27   c.    
     When the rear end of the raising/lowering device  200  moves up, the raising/lowering device  200  slants gradually. Since the force applying member  524  may be the tension spring, the force applying member continuously pulls the lower hook  524  forward. For example, the lower hook  524  moves forward while moving upward gradually and thus may be engaged with the upper locking mechanism  510 . For example, as illustrated in  FIG. 16 , before the lower end of the lower hook  524  moves away from the upper end of the spacing protrusion  27   c , the lower hook  524  and the upper locking mechanism  510  may be engaged with each other. 
     In one example, since the lower hook  524  of the lower locking mechanism  520  and the upper locking mechanism  510  may be engaged with each other when the rear end part of the raising/lowering device  200  may be lifted upward, the raising/lowering device  200  may be maintained at the folded state and the scissor side connection part  250  deviates from the connection hole  27   b  of the storage bin  27 . For example, the raising/lowering device  200  may be completely removed from the upper side of the storage bin  27 . 
       FIG. 17  may be an exploded-perspective view illustrating configuration of the inner cover  300  separated from the storage bin  27  according to the present disclosure. As described above, the inner cover  300  may cover the rear end portion of the inner space of the storage bin  27 . For example, the inner cover  300  may include the front surface cover  310  and the upper surface cover  320 . The front surface cover  310  partitions the inner space of the storage bin  27  into the front space and the rear space and may be formed in a step shape, and the upper surface cover  320  may be rotatably connected to the upper end of the front surface cover  310  and covers the rear upper surface of the front surface cover  310 . 
     In addition, the front surface cover  310  may be including the upper end portion  312 , the step surface  314 , and the lower end portion  316 . The upper end portion  312  may be provided for rotatable connection of the upper surface cover  320 , the step surface  314  may be formed by being bent perpendicularly forward from the lower end of the upper end portion  312  and extending, and the lower end portion  316  may be formed by being bent perpendicularly downward from the end of the step surface  314 . 
     The inner cover  300  may include a main member (or main frame)  330  forming a frame of the inner cover  300  and an exterior material (or exterior cladding)  360  forming an exterior of the inner cover  300 . In some examples, the main member  330  may be made of an injection molded article by injection molding, and an entire shape thereof may be molded in a ‘ ’ shape (or inverted “L” shape), as shown from right side of the drawings. In addition, the exterior material  360  may be coupled to each of a front surface and an upper surface of the main member  330  to form appearance of the front and upper surfaces thereof. 
     In some examples, the exterior material  360  may be formed of metal material or a clad material. For example, the exterior material  360  may be formed to cover the front and upper surfaces of the main member  330  made of the injection molded article and functions to form a neat appearance. For example, the exterior material  360  may be formed of a material that creates a luxurious texture. 
     The metal material may be excellent in gloss and easy to be deformed and may be frequently used in household goods and interior products. In addition, in order to prevent a disadvantage that the metal material rusts more than stainless steel and aluminum, surfaces of the products may be coated or painted separately. 
     The clad material may be advanced new materials that combine several different metals together to take advantage of each metal. Among them, it may be preferable to use a material in which aluminum having excellent thermal conductivity, heat preservation rate, and thermal efficiency may be combined with stainless steel having excellent flame resistance, acid resistance, alkali resistance, and corrosion resistance. 
     The main member  330  may include a front surface member (or front surface wall)  340  and an upper surface member (or upper surface wall)  350 . The front surface member  340  may be installed vertically inside the storage bin  27 , and the upper surface member  350  may be rotatably connected to an upper end of the front surface member  340  and covers a rear upper end of the front surface member  340 . 
     In addition, the exterior material (or exterior cladding)  360  may include a front exterior material  362  and an upper exterior material  364 . The front exterior material (or front exterior cladding)  362  may be installed adjacent to or to contact a front surface of the front surface member  340  and the upper exterior material (or upper exterior cladding)  364  may be installed adjacent to or to contact with an upper surface of the upper surface member  350 . 
     In addition, the front exterior material  362  may be provided as a separate structure from the upper exterior material  364 . For example, the front exterior material  362  and the upper exterior material  364  may be configured separately from each other and may be respectively installed to cover the front surface of the front surface member  340  and the upper surface of the upper surface member  350 . 
     A locking end  332  may be provided on a lower end of the front surface member  340 . As illustrating in the drawings, the locking end  332  may be formed by protruding forward from the lower end of the front surface member  340 , and may be provided as two locking ends  332  from side to side. The locking end  332  may be a location where the rear end hook  260  may be held and fastened. For example, the locking end  332  may be including a hook hole  332   a  penetrating vertically. For example, the rear end hook  260  may be inserted into the hook hole  332   a  provided in the locking end  332 . The hook hole  332   a  may be formed by penetrating the locking end  332  vertically, but may be formed in a groove shape on the locking end  332 . For example, the hook hole  332   a  may be formed in a groove depressed downward from an upper surface of the locking end  332 . 
     A bump  334  may be provided on an inner side surface of the storage bin  27  for preventing rearward movement of the inner cover  300 . For example, on left and right inner side surfaces of the storage bin  27 , a pair of preventing steps  334  may be formed to face each other. As illustrating in the drawings, each of the preventing steps  334  may be formed on an upper half portion of the inner side surface of the storage bin  27  with a particular length up and down (e.g., a vertical height). 
     In addition, the bump  334  may be formed to have elasticity. For example, the bump  334  may be integrally formed with the inner side surface of the storage bin  27  which may be formed of the same material of the exterior material  360  of the inner cover  300 , and a part of the inner side surface of the storage bin  27  protrudes inward to form the bump  334 . 
     The bump  334  has elasticity to be moveable from side to side. For example, the bump  334  may have elasticity by a shape or a material thereof, and may be configured to be moveable from side to side by elasticity of the inner side surface of the storage bin  27  which may be integrally formed therewith. For example, when a particular external force may be applied to the front surface cover  310  of the inner cover  300  which may be positioned in front of the bump  334 , the preventing steps  334  may be retracted leftward and rightward by elasticity and the front surface cover  310  may be moveable rearward. 
     When at least a force of about 3N is applied to the front surface cover  310  from the front, the bump  334  may be designed to be retracted leftward and rightward so that an upper end of the front surface cover  310  may be moved rearward. When the upper half portion of the front surface cover  310  is moved rearward by passing through the bump  334 , the front surface cover  310  may be rotated clockwise to be in close contact with a rear surface  27   a  of the storage bin  27  because a lower end of the front surface cover  310  may be fixed to be rotatable. 
     The bump  334  may be formed by protruding to interfere with a side surface of the inner cover  300 . The bump  334  protrudes inward by an amount that interferes with the side surface of the front surface cover  310  of the inner cover  300 . For example, since the bump  334  may function, for example, to prevent rearward movement of the front surface cover  310  of the inner cover  300 , the bump  334  being incorrectly installed to not contact the side surface of the front surface cover  310  may cause the function thereof to be lost. 
     For example, the bump  334  may protrude to overlap the side surface of the inner cover  300  by at least 0.5 mm. This configuration may aid user convenience. For example, if necessary, the user may push the inner cover  300  rearward to closely contact the rear surface of the storage bin  27  and use the entire inner space of the storage bin  27  as a storage space. 
     For example, when a user, especially a child, inserts a finger of the user into the gap between the raising/lowering device  200  and the inner cover  300 , the front surface cover  310  may be prevented from being easily pushed rearward in order to prevent the finger from being trapped. Therefore, appropriate elasticity may be provided to prevent the front surface cover  310  from being pushed rearward. 
     However, when the bump  334  excessively protrudes inward and overlaps the side surface of the inner cover  300  by a size larger than 0.5 mm, the front surface cover  310  does not pass over the bump  334  when the user pushes the front surface cover  310  rearward. In another example, when the bump  334  overlaps the side surface of the inner cover  300  by a side less than 0.5 mm (equal to or less than 5 mm), the front surface cover  310  falls rearward by passing over the bump  334 , even when the user grasps the raising/lowering device  200  or only touches the front surface cover  310  during operation of putting food into the storage bin  27  or taking out food in addition to the case of pushing the front surface cover  310  rearward. Therefore, there may be a safety accident or may be inconvenient to use. 
     A fastening end  70  may be further provided in the step shape on a rear end of the storage bin  27 , for example, on an upper end of the rear surface  27   a . The fastening end  70  has at least one fastening bar  72 . The fastening end  70  may be a location where a rear end of the upper surface cover  320  of the inner cover  300  may be seated, and the fastening bar  72  may be a portion fitted into a cover fastening member  354 , which will be described hereinbelow. In addition, at least one guide  80  may be further provided in an upward protruding shape in rear of the fastening end  70 , and guides a position where the rear end of the upper surface cover  320  may be mounted. 
     The front exterior material  362  and the upper exterior material  364  may be provided as separate structures. For example, the front exterior material  362  and the upper exterior material  364  may be formed separately from each other, and may be respectively installed to cover the front surface of the front surface member  340  and the upper surface of the upper surface member  350 . As illustrating in the drawings, the front exterior material  362  and the upper exterior material  364  may be respectively formed in shapes corresponding to the front surface member  340  and the upper surface member  350  of the main member  330 . For example, the front exterior material  362  may be formed vertically in the step shape like the front surface member  340  and the upper exterior material  364  may be formed of a flat plate having a particular width like the upper surface member  350 . 
     In addition, the lower end of the inner cover  300  may be rotatably coupled to the bottom surface of the storage bin  27 . For example, the lower end of the inner cover  300  has at least one cover hinge  348 , which will be described hereinbelow, and the bottom surface in the storage bin  27  may include a hinge receiving part (or hinge receiving cavity)  27   d , which will be described hereinbelow, to rotatably support the cover hinge  348 . 
     In addition, the cover hinge  348  may include a support end  348   a  and a hinge shaft  348   b , which will be described hereinbelow. The support end  348   a  may be formed by extending perpendicularly rearward from the lower end of the inner cover  300 , and the hinge shaft  348   b  may be formed in a slender round bar shape at a rear end of the support end  348   a.    
     Hereinbelow, configuration of the cover hinge  348  and the main member  330  will be described in detail with reference to  FIG. 18 .  FIG. 18  may be a perspective view illustrating the main member  330 . As illustrating in  FIG. 18 , the main member  330  may include the front surface member  340  installed vertically and the upper surface member  350  installed horizontally by being rotatably hinge-coupled to the upper end of the front surface member  340 . 
     The front surface member  340  may be formed in the step shape like the front surface cover  310  described above, as illustrated in  FIG. 18 . For example, the front surface member  340  may include a main upper end portion  342 , a main step surface  344 , and a main lower end portion  346 . The main upper end portion  342  may be provided to allow the upper surface member  350  to be rotatably connected, the main step surface  344  may be formed by being bent perpendicularly forward from a lower end of the main upper end portion  342  and extending, and the main lower end portion  346  may be formed by being bent perpendicularly downward from an end of the main step surface  344  and extending. 
     In addition, the locking end  332  may be formed by protruding forward from a lower end of the main lower end portion  346  of the front surface member  340 , and the locking end  332  has the hook hole  332   a  described above. The main lower end portion  346  of the front surface member  340  may include the cover hinge  348  at the lower end thereof. 
     As illustrated in  FIG. 18 , the cover hinge  348  may include the support end  348   a  formed by extending perpendicularly rearward from the lower end of the front surface member  340  and the hinge shaft  348   b  formed at the rear end of the support end  348   a . As illustrated in the drawings, the pair of support ends  348   a  may be provided, and the hinge shaft  348   b  may be connected between ends of the pair of support ends  348   a . The hinge shaft  348   b  may be formed in the slender round bar shape, and may be mounted to the hinge receiving part  27   d , which will be described hereinbelow. 
     The upper surface member  350  may be rotatably connected to the upper end of the front surface member  340 . In addition, the upper surface member  350  may be configured to be rotated clockwise (e.g., in  FIG. 18 ) in a connection state to the upper end of the front surface member  340  so as to overlap the front surface member  340 . 
     The upper surface member  350  may have a fastening step  352  protruding downward on a rear end of a lower surface. The fastening step  352  may be seated in the fastening end  70  formed at the rear end of the storage bin  27 . For example, the fastening step  352  may be seated to contact the front of the fastening end  70  formed in the step shape. 
     In addition, as illustrated in the drawings, the fastening step  352  may be formed in a width direction of a lower surface of the upper surface member  350 , and the cover fastening member  354  may be formed in rear of the fastening step  352 . The cover fastening member  354  may be provided so that the fastening bar  72  of the storage bin  27  may be inserted therein by elasticity. The cover fastening member  354  may include a moving protrusion  354   a  and a fixed protrusion  354   b , the moving protrusion  354   a  may be formed such that a part of the fastening step  352  may be cut and the fixed protrusion  354   b  may be formed by protruding downward from the lower surface of the upper surface member  350 . In some examples, the moving protrusion  354   a  may be formed such that a thickness thereof may be gradually increased from an upper end thereof to a lower end thereof and the lower end may be positioned further rearward than the upper end. 
     The fixed protrusion  354   b  may be formed to face the moving protrusion  354   a  at a particular distance, and may be provided such that a thickness thereof may be gradually increased from an upper end thereof to a lower end thereof and the lower end may be positioned further forward than the upper end. 
     Likewise, the moving protrusion  354   a  and the fixed protrusion  354   b  may be paired, and may be provided so that the fastening bar  72  may be inserted therein. For example, the moving protrusion  354   a  and the fixed protrusion  354   b  may be provided such that a distance therebetween may be gradually decreased from the upper side to the lower side, and a lower gap between the moving protrusion  354   a  and the fixed protrusion  354   b  may be formed to be smaller than an external diameter of the fastening bar  72 . 
     For example, when the rear end of the upper surface member  350  closely contacts the rear end of the storage bin  27  from the upper side to the lower side, a lower end of the cover fastening member  354  contacts an upper end of the fastening bar  72 . In this state, when the upper surface member  350  may be lowered continuously, the fastening bar  72  pushes between the moving protrusion  354   a  and the fixed protrusion  354   b  so that the moving protrusion  354   a  and the fixed protrusion  354   b  may be separated from each other by their own elasticity. Thus, the fastening bar  72  may be inserted between the moving protrusion  354   a  and the fixed protrusion  354   b  and fixed therein. 
       FIGS. 19 to 21  may be sectional views illustrating configuration of the inner cover  300  in detail. For example,  FIG. 19  may be a right side sectional view of the inner cover  300 ,  FIG. 20  may be a sectional view illustrating a state of separating the front surface cover  310  and the upper surface cover  320  from each other, and  FIG. 21  may be an exploded sectional view illustrating each of the front surface cover  310  and the upper surface cover  320 . 
     As illustrating in the drawings, the upper surface cover  320  may be hinge-coupled to the front surface cover  310 . For example, the front surface cover  310  may be configured of the front exterior material  362  and the front surface member  340 , and the front surface member  340  may have a shaft fixing mechanism  370  at the upper end thereof. 
     The shaft fixing mechanism  370  may be rotatably fixed to the front surface member with receiving a rotation shaft  350   a . The rotation shaft  350   a  may include a shaft groove  372  receiving the rotation shaft therein, and an upper rib  374  and the lower rib  376  that may be formed at an upper side and a lower side of the shaft groove  372 . 
     As illustrated in the drawings, the shaft groove  372  may be formed in a semicircular shape and formed to be open rightward. As further illustrated in the drawings, the upper rib  374  and the lower rib  376  may be formed by being bent perpendicularly rightward from the upper end of the front surface member  340  and extending. In addition, right ends of the upper rib  374  and the lower rib  376  may be formed closer to each other than left ends thereof. 
     For example, the right ends of the upper rib  374  and the lower rib  376  may be close to each other (e.g., separated by less than a threshold distance) and formed in a concave shape. In some examples, a distance between the right ends of the upper rib  374  and the lower rib  376  may be formed to be smaller than an external diameter of the rotation shaft  350   a , which will be described hereinbelow. For example, when the rotation shaft  350   a  may be inserted into the shaft groove  372 , the rotation shaft  350   a  may be not removed rightward by elasticity of the upper rib  374  and the lower rib  376 . 
     Upper ends of the front surface member  340  and the front exterior material  362  may be recessed rightward to form a rib groove  378 . The rib groove  378  may be a part where a tip rib  364   a  of the upper exterior material  364  may be seated thereon. 
     As illustrated in the drawings, the upper surface cover  320  may be configured of the upper exterior material  364  and the upper surface member  350 . The rotation shaft  350   a  may be formed by protruding downward on a left end of the upper surface member  350 . The rotation shaft  350   a  may be formed in the slender round bar shape, may be inserted into the shaft groove  372 , and may be supported by the shaft holder  350   b . For example, a left end portion of the upper surface member  350  may position the shaft holder  350   b  to protrude downward and leftward, and the rotation shaft  350   a  may be provided on a left end portion of the shaft holder  350   b.    
     For example, even when the upper surface member  350  may be rotated clockwise while the rotation shaft  350   a  may be inserted in the shaft groove  372 , the upper surface member  350  and the front surface member  340  do not interfere with each other and the upper surface member  350  overlaps to a rear surface of the front surface member  340  (to a right surface in  FIG. 20 ). 
     The tip rib  364   a  may be provided at an end (left end in  FIG. 20 ) of the upper exterior material  364 . The tip rib  364   a  may be formed by being bent perpendicularly downward from the end of the upper exterior material  364 , and may be seated on the rib groove  378  that may be the upper front surface (left surface in  FIG. 20 ) of the front surface cover  310 . 
       FIG. 22  may be a sectional view illustrating a state of an upper end portion of the inner cover  300  fastened to an upper end of the storage bin. As illustrated in  FIG. 22 , the rear end of the inner cover  300  may be coupled to the rear end of the storage bin  27 . For example, the upper surface cover  320  may be provided to cover the upper surface of the rear end of the storage bin  27 , and the rear end thereof may be fixed to the rear end of the storage bin  27  by elasticity. 
     In addition, the guide  80  may be provided by protruding upward on the rear end (right end in  FIG. 22 ) of the storage bin  27 . The guide  80  protrudes upward higher than the fastening end  70 , and guides the rear end (right end in  FIG. 22 ) of the upper surface cover  320  not to pass over (right side in  FIG. 22 ) the guide  80 , when the upper surface cover  320  of the inner cover  300  may be mounted (assembled) to the storage bin  27 . In some examples, the rear end of the storage bin  27  may be further including a deodorizer  90 , and the deodorizer  90  may be detachable. 
       FIG. 23  may be an enlarged sectional view illustrating a state of the lower end of the inner cover  300  mounted to the bottom surface of the storage bin  27 . As illustrated in the drawing, the raising/lowering device  200  may be placed on the bottom surface of the storage bin  27  in the folded state. As described above, the raising/lowering device  200  may be positioned at a front lower end of the inner cover  300 . For example, on the bottom surface of the storage bin  27 , the raising/lowering device  200  for raising and lowering the container  40  may be installed, and the raising/lowering device  200  may be positioned in front of the front surface cover  310  of the inner cover  300 . 
     Between the raising/lowering device  200  and the inner cover  300 , a covering mechanism may be provided. For example, since the raising/lowering device  200  may be installed to be removable by being lifted upward, as described above, a gap may be formed between the rear end of the raising/lowering device  200  and the inner cover  300 . For example, a user&#39;s finger may be inserted into the gap. For example, there may be a safety risk associated with a child&#39;s finger being trapped in the gap. Thus. the covering mechanism may at least partially cover the gap between the raising/lowering device  200  and the inner cover  300 , and the cover piece  270  may be used as the covering mechanism. 
     As described above, on the upper end of the raising/lowering device  200 , the support plate  210  may be provided to have the shape corresponding to the shape of the lower end of the container  40  so as to support the lower end thereof. The cover piece  270  may be provided at the rear end of the support plate  210 . 
     As described above, the cover piece  270  may be formed by extending rearward from the rear end of the raising/lowering device  200  at a particular length. Specifically, the cover piece  270  may be formed of a flat plate having a particular thickness, and may be formed by extending rearward from the rear end of the support plate  210  of the raising/lowering device  200  at a particular length. 
     In some examples, a gap L between the cover piece  270  and the inner cover  300  may be formed less than 6 mm considering a thickness of a user&#39;s finger. For example, usually, a thickness of a person&#39;s finger may be greater than 6 mm, so that the gap L may be formed with a width of 6 mm to prevent the person&#39;s finger from being inserted therein. 
     In addition, as illustrated in the drawings, the cover piece  270  and the step surface  314  may be installed to overlap each other up and down. For example, the cover piece  270  may be positioned above the step surface  314  that may be provided in the front surface cover  310  of the inner cover  300 , and the step surface  314  and the cover piece  270  may be provided to overlap each other. 
     When the cover piece  270  and the step surface  314  overlap up and down, even when the finger of a user may be inserted from the upper side into the gap L between the cover piece  270  and the inner cover  300 , the step surface  314  prevents the insertion of the finger. In addition, a height between the cover piece  270  and the step surface  314  may be formed higher than 10 mm for protecting a child&#39;s finger. 
     For example, even when the gap L between the cover piece  270  and the inner cover  300  may be formed less than 6 mm, the child&#39;s finger may be inserted into the gap L and lowered downward. Even in this case, it may be possible that a child&#39;s finger may be trapped between the cover piece  270  and the step surface  314 . 
     For example, since the raising/lowering device  200  may be seated downward due to its own weight, when the height H between the cover piece  270  and the step surface  314  may be formed less than 10 mm, a child&#39;s finger may be pressed between the cover piece  270  and the step surface  314 , thereby causing a safety accident. The height H of 10 mm or more may be to prevent the safety accident. 
     In addition, the lower end of the inner cover  300  may be rotatably coupled to the bottom surface of the storage bin  27 . For example, as described above, at least one cover hinge  348  may be provided at the lower end of the inner cover  300 , and the hinge receiving part  27   d  rotatably supporting the cover hinge  348  may be provided at the bottom surface in the storage bin  27 . 
     The hinge receiving part  27   d  may be provided to be open upward at the rear end of the bottom surface of the storage bin  27 . For example, as illustrated in the drawing, the hinge receiving part  27   d  may be formed to have a semicircular inner section and supports the hinge shaft  348   b  to be removable upward and mountable from above. 
       FIG. 24  may be a partial cut sectional view illustrating an installation state of each of the front surface cover  310  and the bump  334 . For example, the drawing illustrates a partial cut perspective view in which the upper surface cover  320  may be rotated on the rotation shaft  350   a  so that the front surface cover  310 , and the upper surface cover  320  may be overlap and the bump  334  prevents the rearward movement of the front surface cover  310 . 
     As illustrated in  FIG. 24 , the front surface cover  310  may be installed to be positioned in front of the bump  334  (left side in  FIG. 24 ), and may be prevented to be moved rearward (right side in  FIG. 24 ). For example, the bump  334  prevents the rearward movement of the front surface cover  310  by elasticity. For example, illustrated in the drawing, the bump  334  may be formed by protruding inward to interfere with the side surface of the inner cover  300 . For example, the bump  334  protrudes inward from the inside surface of the storage bin  27  to interfere with the side surface of the inner cover  300 . 
     Similarly, the bump  334  may be formed to protrude inward from the inner surface of the storage bin  27  so as to interfere with the side surface of the front surface cover  310 . As illustrated in  FIG. 24 , even when the upper surface cover  320  is rotated clockwise on the rotation shaft  350   a  to overlap the front surface cover  310 , the front surface cover  310  may be maintained substantially upright state by the bump  334  unless the user pushes the front surface cover  310  rearward (e.g., to right side in  FIG. 24 ) with at least a particular amount of force. 
     In addition, the bump  334  may be integrally formed with the inner surface of the storage bin  27  or may be provided as a separate structure to be attached to the inner surface of the storage bin  27 . The bump  334  may be formed by protruding to overlap the side surface of the inner cover  300  by at least 0.5 mm. For example, as described above, when the inner cover  300  may be pushed over a particular amount of force, the inner cover  300  may be movable past the bump  334 . 
       FIG. 26  is a side view illustrating the inner cover  300  is in close contact with the rear surface  27   c  of the storage bin  27  while being folded. As illustrated in  FIG. 26 , it is necessary to remove the inner cover  300  to improve the usefulness of the inner space of the storage bin  27 . For example, the rear end of the upper surface cover  320  of the inner cover  300  may be separated from the rear end of the storage bin  27 , and then, the upper surface cover  320  may be rotated clockwise on the rotation shaft  350   a  so as to overlap the front surface cover  310 , as illustrated in  FIG. 24 . 
     When the inner cover  300  is pushed rearward (e.g., to right side in  FIGS. 24 and 26 ), the front surface cover  310  may pushed rearward past the bump  334 . For example, when the front surface cover  310  is pushed rearward, the bump  334  may be pushed to the side of the storage bin  27 , and the upper end of the front surface cover  310  may be pushed rearward while the front surface cover  310  is rotated on the lower end thereof. Accordingly, the inner cover  300  in the folded state may be rotated clockwise (e.g., as shown in  FIG. 26 ) on the cover hinge  348  provided at the lower end thereof, thereby being in close contact with the rear surface  27   c  of the storage bin  27  as illustrated in  FIG. 26 . In this configuration, the inner space of the storage bin  27  may be widened so that the user can store more food therein. 
       FIG. 27  is a partial side sectional view illustrating rear end configurations of the storage bin  27  and the upper surface cover  320 . As illustrated in  FIG. 27 , the guide  80  may be further provided at the rear end of the storage bin  27 , for example, to prevent the inner cover  300  from being moved toward the rear of the storage bin  27 . 
     The guide  80  may be formed by protruding upward from the upper end of the rear surface of the storage bin  27 , and at least one guide  80  may be provided at the upper end thereof. For example, the guide  80  is formed by protruding upward from the upper end of the rear surface  27   c  of the storage bin  27  to prevent the rear end of the upper surface cover  320  from being moved to an upper rear side of the storage bin  27  during assembling of the inner cover  300 . Accordingly, the guide  80  may function as a guide that allows the rear end of the upper surface cover  320  to be easily assembled with the rear end of the storage bin  27 . 
     The guide  80  may include a support portion  82  and a guide portion  84 . The support portion  82  may be formed by extending rearward from the upper end of the rear surface  27   c  of the storage bin  27  and the guide portion  84  is formed by being bent perpendicularly upward from a rear end of the support portion  82  and extending. 
     The support portion (or support base)  82  may be formed to extend rearward from the rear end of the storage bin  27 , as illustrated in the drawing. Furthermore, an upper surface thereof may be formed horizontally and a lower surface thereof may be formed to have a slope that is gradually increased from the front to the rear. For example, the support portion  82  may be formed in a wedge shape in which a section is gradually decreased from the front to the rear. 
     The guide portion (or guide protrusion)  84  may contacts the rear end of the upper surface cover  320  of the inner cover  300 . The guide portion  84  may have a sectional size that is gradually decreased from a lower side thereof to an upper side thereof. Since strength may be improved when the lower side is thicker, the guide portion  84  may firmly support the upper surface cover  320  when the guide portion  84  is pushed rearward by the upper surface cover  320 . For example, a front surface of the guide portion  84  may be formed vertically, and a rear surface of the guide portion  84  is formed at an incline in which a lower side thereof is positioned further rearward than an upper side thereof. In this way, the lower end of the guide portion  84  is thicker than the upper end thereof. 
     The upper end of the guide portion  84  may be formed to have a round shape, such that a front side thereof is lower than a rear side thereof. For example, an upper front surface of the guide portion  84  may be rounded with a predetermined curvature, as illustrated in the drawing. When the upper surface cover  320  of the inner cover  300  is coupled to the rear end of the storage bin  27 , even when the rear end of the upper surface cover  320  moves downward to contact the upper end of the guide portion  84 , the rear end of the upper surface cover  320  may be moved downward by sliding on the round upper front surface of the guide portion  84 . 
     A height of the guide  80  may be greater than a height of the fastening end  70 . For example, the upper end of the guide  80  may protrude upward so as to be positioned higher than an upper end of the fastening end  70 . For example, an upper end of the guide  80  may protrude upward more than a thickness size of the upper surface cover  320  from the upper end of the fastening end  70 . 
     As described above, the fastening end  70  may be formed by protruding upward on the rear end of the storage bin to support the rear end of the upper surface cover  320  and the fastening end  70  is provided with at least one fastening bar  72 . By cutting a part of the fastening end  70  that is formed long from side to side (front to rear in  FIG. 27 ) on the rear end of the storage bin  27 , the fastening bar  72  may have a slender round bar shape that is provided in the cut portion. 
     The fastening end  70  may be preferably positioned further forward than the guide portion  84  of the guide  80  by a predetermined distance. In addition, on the rear end of the upper surface cover  320 , the cover fastening member  354  to which the fastening bar  72  is fastened may be provided so that the upper surface cover  320  is fixed to the rear end of the storage bin  27 . The cover fastening member  354  may be configured to fix the fastening bar  72  by elasticity. For example, the cover fastening member  354  may include the moving protrusion  354   a  and the fixed protrusion  354   b , which are formed by respectively extending downward from the lower surface of the upper surface cover  320 . The moving protrusion  354   a  and the fixed protrusion  354   b  may be formed by being spaced apart from each other and facing at a predetermine distance. 
     In addition, the moving protrusion  354   a  may have a larger elasticity than the fixed protrusion  354   b . For example, the moving protrusion  354   a  may extend downward from the lower surface of the upper surface member  350 , and the fixed protrusion  354   b  may be integrally formed with the rear end of the upper surface member  350 . 
     A gap between the moving protrusion  354   a  and the fixed protrusion  354   b  may be formed such that a lower end of the gap has a size smaller than an upper end of the gap. For example, after the fastening bar  72  is inserted between the moving protrusion  354   a  and the fixed protrusion  354   b , since the fastening bar  72  may be prevented from being separated from the cover fastening member  354  unless a predetermined amount of force is applied thereto, the gap between the moving protrusion  354   a  and the fixed protrusion  354   b  being preferably such that the lower end is narrower than the upper end. 
     In certain examples, an inner distance W between the lower ends of the moving protrusion  354   a  and the fixed protrusion  354   b  may be smaller than a size of the external diameter of the fastening bar  72 . This configuration may help prevent the fastening bar  72  from being removed naturally or by a fine force when the fastening bar  72  is received between the moving protrusion  354   a  and the fixed protrusion  354   b.    
     In addition, the lower ends (e.g., lower surfaces) of the moving protrusion  354   a  and the fixed protrusion  354   b  may be formed in an inclined surface  354   c  or are formed with a predetermined curvature. For example, the lower end of each of the moving protrusion  354   a  and the fixed protrusion  354   b  may be formed in the inclined surface  354   c  so that an outside width between the lower ends is greater than an inner width therebetween, or is may be rounded so that the inclined surface  354   c  has a prescribed curvature. In this configuration, when the fastening bar  72  contacts the lower ends of the moving protrusion  354   a  and the fixed protrusion  354   b , an upper surface of the fastening bar  72  may slide on the lower ends of the moving protrusion  354   a  and the fixed protrusion  354   b.    
     Likewise, when the lower ends of the moving protrusion  354   a  and the fixed protrusion  354   b  contact the upper surface of the fastening bar  72  while the upper surface cover  320  is moved downward, a lower end of the moving protrusion  354   a  may be moved forward (e.g., to left side in  FIG. 27 ) so that the fastening bar  72  may be inserted between the moving protrusion  354   a  and the fixed protrusion  354   b  and received therein. When the upper surface cover  320  is moved downward, a lower end of the fixed protrusion  354   b  may be moved backward (e.g., to right side in  FIG. 27 ) by elasticity. 
       FIGS. 28 and 29  illustrates states in which the rear end of the upper surface cover  320  is guided by the guide  80  and is fastened to the rear end of the storage bin  27 . For example,  FIG. 28  is a partial side sectional view illustrating the rear end of the upper surface cover  320  before being fastened to the rear end of the storage bin  27 , and  FIG. 29  is a partial side sectional view illustrating the rear end of the upper surface cover  320  when fastened to the rear end of the storage bin  27 . 
     To fastening the upper surface cover  320  to the rear end the storage bin  27 , the upper surface cover  320  may be moved rearward while being positioned near the upper end of the storage bin  27 . In this position, the rear end of the upper surface cover  320  may be moved rearward and the rearward movement may be blocked by the guide  80 , as illustrated in  FIG. 28 . When the rear end of the upper surface cover  320  contacts a front surface of the guide portion  84  of the guide  80 , the rear end of the upper surface cover  320  may be pressed downward by a force applied from above. 
     In  FIG. 28 , when the upper surface cover  320  may be pressed downward, the lower ends of the moving protrusion  354   a  and the fixed protrusion  354   b  may come into contact with the upper surface of the fastening bar  72 , and the lower ends of the moving protrusion  354   a  and the fixed protrusion  354   b  may be spaced apart from each other by elasticity. Then, as illustrated in  FIG. 29 , the fastening bar  72  may be inserted between the moving protrusion  354   a  and the fixed protrusion  354   b.    
     After the fastening bar  72  is inserted between the moving protrusion  354   a  and the fixed protrusion  354   b , the fastening of the upper surface cover  320  may be completed. The rear end of the upper surface cover  320  may not be separated from the rear end of the storage bin  27  unless the user applies upward force to the upper surface cover  320 . 
     Although the embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. For example, although the embodiment illustrate a case in which the upper surface cover  320  is provided with the moving protrusion  354   a  and the fixed protrusion  354   b  and the fastening bar  72  is formed at the storage bin  27 , the positions of the fastening bar  72 , the moving protrusion  354   a , and the fixed protrusion  354   b  can be reversed or otherwise changed. 
     Aspects of the present disclosure describe a refrigerator in which a rear side of a raising/lowering device is covered by an inner cover, wherein the inner cover partitioning an inner space of a storage chamber may be assembled, and the inner cover, which partitions the inner space of the storage chamber, may be removed so that utilization of a storage space of the refrigerator is improved. 
     According to one aspect of the present disclosure, a refrigerator may include a cabinet having a storage chamber, a drawer provided with a storage bin in which a container or food may be stored, and an inner cover provided to cover a rear end portion of an inner space of the storage bin, wherein the storage bin may be further provided with a guide facilitating mounting of the inner cover. In addition, the guide may be provided by protruding upward from a rear end of the storage bin. In addition, the guide may function to prevent the inner cover from being moved toward a rear side of the storage bin, and to guide a position where the rear end of the inner cover is assembled. 
     In another aspect, a refrigerator may include: a cabinet having a storage chamber provided therein and an open front; a cooling device provided at one side of the cabinet and cooling the storage chamber; a drawer provided with a front panel and a storage bin, the front panel being pulled out and pushed in so that an open front portion of the storage chamber is opened and closed and the storage bin being provided in rear of the front panel and storing a container or food therein; an inner cover provided at the storage bin so as to cover a rear end portion of an inner space of the storage bin; and a guide provided in a rear end of the storage bin and preventing the inner cover from being moved toward a rear of the storage bin. The guide may be provided by protruding upward from an upper end of a rear surface of the storage bin. At least one guide may be provided at the upper end of the rear surface of the storage bin. 
     The guide may include a support portion provided by extending rearward from the upper end of the rear surface of the storage bin and a guide portion provided by being bent perpendicularly upward from a rear end of the support portion and extending. A section size of the guide portion may be gradually reduced from a lower side thereof to an upper side thereof. In addition, the guide portion may have a vertical front surface and an inclined rear surface provided such that a lower side thereof is positioned further rearward than an upper side thereof. 
     In addition, an upper end of the guide portion may be formed in a round shape, the round shape being provided such that a front side thereof is lower than a rear side thereof. The inner cover may include: a front surface cover partitioning the inner space of the storage bin into a front space and a rear space; and an upper surface cover rotatably connected to an upper end of the front surface cover, and covering an upper surface of the front surface cover, wherein a lower end of the front surface cover may be rotatably connected to a bottom surface of the storage bin. 
     On the rear end of the storage bin, a fastening end may be provided by protruding upward so as to support a rear end of the front surface cover, and the fastening end may be provided with at least one fastening bar. A cover fastening member may be provided on the rear end of the upper surface cover to be fastened to the fastening bar so that the upper surface cover may be fixed to the rear end of the storage bin. The cover fastening member may fix the fastening bar by elasticity. In addition, the cover fastening member may be provided by extending downward from a lower surface of the upper surface cover and may include a moving protrusion and a fixed protrusion, which are disposed by being spaced apart from each other. 
     A gap between the moving protrusion and the fixed protrusion may be provided such that a lower end thereof has a size smaller than an upper end thereof. A gap between lower ends of the moving protrusion and the fixed protrusion may have a size smaller than a size of an external diameter of the fastening bar. Each of the lower ends of the moving protrusion and the fixed protrusion may be formed in an inclined surface or with a predetermined curvature. 
     According to an aspect of the refrigerator, the inner cover is further provided in the storage bin to partition the inner space of the storage bin into the front space and the rear space, and the inner cover is mounted to the storage bin to be detachable. Accordingly, the inner cover can be installed and removed depending on user&#39;s choice, thereby improving utilization of the storage chamber of the refrigerator. In addition, the inner cover may include a front surface cover and a upper surface cover, and the front and upper surface covers may be configured to be rotatable by a hinge. Accordingly, when the inner cover is unnecessary, the front and upper surface covers can overlap each other and then be removed by being pushed rearward, thereby facilitating installation and removal thereof and improves ease of use. 
     In addition, the inner cover may be rotatable on the lower end thereof. Accordingly, the inner cover can be in close contact with the rear surface of the storage bin by pushing the upper end of the inner cover from the front to the rear. Therefore, while the inner cover in a folded state is laid down by a simple operation, the storage bin can be efficiently used. 
     The guide may be formed by protruding upward on the rear end of storage bin. Accordingly, when the upper surface cover of the inner cover is assembled, the guide prevents the rearward movement of the rear end of the upper surface cover is prevented, thereby allowing the inner cover to be assembled (mounted) easily. In addition, the rear end of the upper surface cover of the inner cover is fastened to the rear end of the storage bin by elasticity such that the inner cover may be easily assembled or disassembled. 
     It will be understood that when an element or layer is referred to as being “on” another element or layer, the element or layer can be directly on another element or layer or intervening elements or layers. In contrast, when an element is referred to as being “directly on” another element or layer, there are no intervening elements or layers present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section could be termed a second element, component, region, layer or section without departing from the teachings of the present invention. 
     Spatially relative terms, such as “lower”, “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” relative to other elements or features would then be oriented “upper” relative to the other elements or features. Thus, the exemplary term “lower” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Embodiments of the disclosure are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the disclosure. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the disclosure should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
     Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art. 
     This application is also related to U.S. application Ser. No. 16/583,726 filed Sep. 26, 2019, U.S. application Ser. No. 16/582,647 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,518 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,605 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,756 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,810 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,668 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,755 filed Sep. 25, 2019, U.S. application Ser. No. 16/582,831 filed Sep. 25, 2019, U.S. application Ser. No. 16/585,284 filed Sep. 27, 2019, U.S. application Ser. No. 16/585,301 filed Sep. 27, 2019, and U.S. application Ser. No. 16/585,816 filed Sep. 27, 2019, whose entire disclosures are also hereby incorporated by reference.