Patent Publication Number: US-11656024-B2

Title: Refrigerator

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/701,015, filed on Dec. 2, 2019, which claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2018-0153531, filed on Dec. 3, 2018, which is hereby incorporated by reference in its entirety. 
    
    
     BACKGROUND 
     The present disclosure relates to a refrigerator. 
     In general, refrigerators are home appliances for storing foods at a low temperature in a storage chamber that is covered by a door. For this, refrigerators cool the inside of the storage chamber by using cool air generated by being heat-exchanged with a refrigerant circulated through a refrigeration cycle to store foods in an optimum state. 
     Such a refrigerator is becoming larger and multifunctioned as dietary changes and user&#39;s preferences become more diverse, and thus, a refrigerator having various structures and convenience devices for user&#39;s convenience and freshness of stored foods has been introduced. 
     The storage chamber of the refrigerator may be opened/closed by the door. Also, refrigerators may be classified into various types according to an arranged configuration of the storage chamber and a structure of the door for opening and closing the storage chamber. 
     The refrigerator door may be classified into a rotation-type door that opens and closes a storage chamber through rotation thereof and a drawer-type door that is inserted and withdrawn in a drawer type. 
     Also, the drawer-type door is often disposed in a lower region of the refrigerator. Thus, when the drawer-type door is disposed in the lower region of the refrigerator, a user has to turn its back to take out a basket or foods in the drawer-type door. If the basket or the foods are heavy, the user may feel inconvenient to use the basket or may be injured. 
     In order to solve such a limitation, various structures are being developed in which the drawer-type door is capable of being elevated. 
     Representatively, a refrigerator in which a lifting mechanism for elevating a bin provided in a refrigerating compartment is disclosed in U.S. Pat. No. 9,377,238. 
     However, according to the related art, the lifting mechanism for elevation may be disposed outside the bin and thus exposed. In addition, a wiring for an operation of the lifting mechanism and a wiring connected to electronic components provided in a door may be exposed to the outside. 
     Thus, serious limitation in safety may occur due to the exposure of the lifting mechanism and the wiring. Also, the exposed wirings may be damaged during the repeated lifting operation or the withdrawal of the drawer to cause failure or malfunction. 
     SUMMARY 
     Embodiments provide a refrigerator in which electronic components are provided in a door part defining a front surface of a draw-out drawer door, and a wiring guider that connects a cabinet to the door part to guide wirings connected to the electronic components is provided. 
     Embodiments also provide a refrigerator in which an electric device for elevation is provided inside a door part, and a mechanical device for elevating is provided in a drawer part, and a wiring guider guiding a wiring from a cabinet to the door part is provided. 
     Embodiments also provide a refrigerator provided with a wiring guider that prevents a wiring connected to electronic components provided in a draw-out door from being exposed to the outside when the door is inserted and withdrawn. 
     Embodiments also provide a refrigerator provided with a wiring guider that connects a draw-out door to a main body to guide an arrangement of a wiring. 
     Embodiments also provide a refrigerator provided with a wiring guider capable of stably maintaining a connected state of a wiring even though a door is repeatedly inserted and withdrawn. 
     Embodiments also provide a refrigerator in which a wiring is easily connected to electric components within a draw-out door through a wiring guider. 
     Embodiments also provide a refrigerator which prevents constituents for elevation of a drawer part and a wiring connected to operate the constituents for elevation from being exposed to improve an outer appearance thereof and safety. 
     In one embodiment, a refrigerator includes: a cabinet that defines a storage chamber; a drawer door that is positioned configured to be inserted into and withdrawn out of the storage chamber; a door part that defines a front surface of the drawer door, the door part being configured to open and close the storage chamber; a drawer part connected to the door part at a rear side of the door part so as to be inserted and withdrawn together with the door part, the drawer part being configured to accommodate foods; a driving device provided in the door part to elevate at least a portion of the drawer part; and a wiring guider configured to connect the cabinet to a rear surface of the door part, the wiring guider being disposed to pass through a lower side of the drawer part and configured to guide a cabinet-side wiring up to the door part. 
     In another embodiment, a refrigerator includes: a cabinet that defines a storage chamber; a drawer door that is positioned configured to be inserted into and withdrawn out of the storage chamber, the drawer door including a drawer part configured to provide a storage space and a door part configured to, based on the drawer door being inserted into and withdrawn out of the storage chamber, open and close the storage chamber, respectively; an elevation device provided at the drawer part and configured to elevate the storage space; a driving device provided at the door part and configured to provide a driving force to the elevation device; and a wiring guider provided between a top surface of the storage chamber and a bottom surface of the drawer door, the wiring guider being configured to guide a wiring that provides an electrical connection between the cabinet and the driving device, wherein the wiring guider includes: a rotation connection member configured to rotatably couple a first end of the wiring guide to the cabinet; a guide head configured to fixedly couple a second end of the wiring guide to the door part; and a flexible portion configured to connect the rotation connection member to the guide head, wherein the wiring between the cabinet and the driving device sequentially passes through the rotation connection member, the flexible portion, and the guide head. 
     A door light configured to emit light toward the inside of the drawer part may be provided on a rear surface of the door part, and the electric device may include the door light. 
     An elevation device that provides a surface configured to support foods and is connected to the driving device so as to be vertically elevated may be provided inside the drawer part, and the electric device may include a driving device configured to power to the elevation device. 
     An elevation detection device configured to detect positions of the elevation device when the elevation ascends and descends may be provided inside the door part, and the elevation detection device may be electrically connected to the wiring. 
     A connecting hole coupled to a front end of the wiring guider may be defined in a rear surface of the door, and the connecting hole may be disposed below a bottom surface of the drawer part. 
     A door-side electrically connector connected to the electric device may be provided inside the connecting hole, a guide-side connector connected to an end of the wiring may be provided at a front end of the wiring guider, and when the wiring guider and the connecting hole are coupled to each other, the door-side connector and the guide-side connector may be connected to each other. 
     The wiring guider may extend from the inside of the cabinet to the rear surface of the door via the lower side of the drawer part. 
     A wiring inlet hole through which the wiring is introduced may be defined in a bottom surface of the storage space, a mounting plate configured to cover the wiring inlet hole may be mounted on the bottom surface of the storage space, and the rotation connection member may be rotatably mounted on the mounting plate to communicate with the wiring inlet hole. 
     A connection member stepped part may be disposed on a circumference of an opened bottom surface of the wiring inlet hole, an opening through which the rotation connection member passes may be defined in the mounting plate, and a stepped part accommodation part configured to accommodate the connection member stepped part may be defined in a circumference of the opening. 
     The wiring inlet hole may include: a first opening having a size greater than that of the stepped part; and a second opening extending from the first opening in one direction, and a connection member restriction part protruding outward so as to be inserted through the second opening is disposed at one side of the connection member stepped part, wherein the connection member restriction part may be hooked to be restricted to the first opening. 
     A front surface of the guide head may be opened and have a shape corresponding to that of the connecting hole defined in a rear surface of the door part so that the guide head is inserted into the connecting hole. 
     A guide slot that is cut from a front end of the guide head may be defined in an outer surface of the guide head, and when the guide head is inserted into the connecting hole, a portion of the door part may be inserted into the guide slot so that the guide slot guides the coupling of the guide head. 
     A fixing protrusion protruding to contact an inner surface of the connecting hole so as to prevent the guide head from moving may be disposed on the guide head. 
     The flexible portion may be provided in plurality, which have the same structure and are connected to each other, between the rotation connection member and the guide head, and the plurality of flexible portions connected to each other may be rotatably connected to each other. 
     Surfaces of the flexible portions, which face each other, may be opened to provide a passage through which the wiring passes, and a front connection part may be provided at a front end of the opened flexible portion, and a rear connection part rotatably connected to the front connection part of the adjacent flexible portion may be disposed at a rear end of the opened flexible portion. 
     Connection parts may be disposed at opened sides of the rotation connection member and the guide head, respectively, and each of the connection parts may have the same structure as the front connection part or the rear connection part of the flexible portion so that the flexible portion is rotatably connected to the connection part. 
     A flexible portion fixing part may be disposed on a top surface of at least one or more flexible portions of the plurality of flexible portions, and a flexible portion coupling part coupled to the connecting portion fixing part may be disposed on a bottom surface of the drawer part, which faces the flexible portion fixing part. A cabinet opening may be defined in a bottom surface of the inside of the storage space, a draw-out motor, a pinion rotation shaft rotating by the draw-out motor, and a pair of pinions coupled to both ends of the pinion rotation shaft may be provided inside the cabinet opening, and a draw-out rack extending in a draw-out direction and coupled to the pinions to insert and withdraw the drawer door may be disposed on a bottom surface of the drawer door. 
     A cover plate configured to cover the cabinet opening may be provided inside the storage space, and the rotation connection member may be rotatably mounted on the cover plate. 
     The refrigerator may further include a bottom cover configured to cover the cabinet opening from a lower side and provide a space configured to accommodate the draw-out motor, the pinion rotation shaft, and the pair of pinions. 
     The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a front view of a refrigerator according to an embodiment. 
         FIG.  2    is a schematic view illustrating a state in which a drawer door of the refrigerator is elevated. 
         FIG.  3    is a perspective view illustrating a state in which the container of the drawer door is separated. 
         FIG.  4    is an exploded perspective view illustrating a state in which a drawer part of a drawer door and a door part are separated from each other when viewed from a front side. 
         FIG.  5    is a view illustrating a rear surface of the door part. 
         FIG.  6    is a rear view illustrating a state in which a door cover of the door part is removed. 
         FIG.  7    is an exploded perspective view of the door part. 
         FIG.  8    is an exploded perspective view illustrating a coupling structure between the door part and the wiring guider. 
         FIG.  9    is a view illustrating a state in which the wiring guider is mounted on a cabinet of the refrigerator. 
         FIG.  10    is a cross-sectional view illustrating an arrangement of a draw-out driving device for inserting and withdrawing the door part. 
         FIG.  11    is an exploded perspective view of the wiring guider when viewed from an upper side. 
         FIG.  12    is an exploded perspective view of the wiring guider when viewed from a lower side. 
         FIG.  13    is a cross-sectional view of the wiring guider. 
         FIG.  14    is a cross-sectional view illustrating an arrangement of the driving device and the wiring guider of the drawer door. 
         FIG.  15    is an enlarged view illustrating a portion A of  FIG.  14   . 
         FIG.  16    is a cutaway perspective view illustrating an arrangement of wirings within the wiring guider. 
         FIG.  17    is a perspective view of the driving device according to an embodiment. 
         FIG.  18    is an exploded perspective view of the driving device. 
         FIG.  19    is an exploded perspective illustrating a coupling structure of a connecting assembly, which is one component of the driving device, and a lever. 
         FIG.  20    is an exploded perspective view of the drawer part. 
         FIG.  21    is an exploded perspective view illustrating a coupling relationship between the drawer part and the connecting assembly. 
         FIG.  22    is an enlarged view illustrating a portion B of  FIG.  21   . 
         FIG.  23    is a perspective view of an elevation device according to an embodiment. 
         FIG.  24    is an exploded perspective view of the elevation device. 
         FIG.  25    is an perspective view of a scissors assembly that is one component of the elevation device. 
         FIG.  26    is a perspective view illustrating a connection state between the connecting assembly and the elevation device. 
         FIG.  27    is a perspective view illustrating a separation state of the connecting assembly and the elevation device. 
         FIG.  28    is a perspective view illustrating a state in which the drawer door is closed. 
         FIG.  29    is a perspective view illustrating a state of the wiring guider in a state in which the drawer door is closed. 
         FIG.  30    is a perspective view illustrating a state in which the drawer door is completely withdrawn. 
         FIG.  31    is a perspective view illustrating a state of the wiring guider in a state in which the drawer door is withdrawn. 
         FIG.  32    is a cross-sectional view illustrating a state of the drawer door in a state in which the basket of the drawer door completely descends. 
         FIG.  33    is a cross-sectional view illustrating a state of the drawer door in a state in which the basket of the drawer door completely ascends. 
         FIG.  34    is a perspective view of a refrigerator according to another embodiment. 
         FIG.  35    is a perspective view of a refrigerator according to another embodiment. 
         FIG.  36    is a perspective view of a refrigerator according to another embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, detailed embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the present disclosure is not limited to proposed embodiments of the present invention, and other regressive inventions or other embodiments included in the scope of the spirits of the present disclosure may be easily proposed through addition, change, deletion, and the like of other elements. 
       FIG.  1    is a front view of a refrigerator according to an embodiment. Also,  FIG.  2    is a schematic view illustrating a state in which a drawer door of the refrigerator is elevated. 
     As illustrated in the drawing, the refrigerator  1  may have an outer appearance that is defined by a cabinet  10  defining a storage chamber and a door  2  covering an opened front surface of the cabinet  10 . 
     The storage chamber of the cabinet  10  may be divided into a plurality of spaces. For example, an upper storage chamber  11  of the cabinet  10  may be provided as a refrigerating compartment, and a lower storage chamber  12  may be provided as a freezing compartment. Alternatively, the upper storage chamber  11  and the lower storage chamber  12  may be provided as independent spaces that are maintained at temperatures different from each other, but are not the refrigerating compartment or the freezing compartment. Also, the lower storage chamber  12  may be divided into a plurality of spaces. As illustrated in the drawings, one space may be opened and closed by a plurality of doors  20  and  30 . 
     Heat exchange spaces  111  and  121  that are partitioned by grill pan assemblies  113  and  123  may be defined behind the upper storage chamber  11  and the lower storage chamber  12 , and an upper evaporator unit  112  and a lower evaporator unit  122  may be respectively disposed in the heat exchange spaces  111  and  121 . A fan may be further provided in the heat exchange spaces  111  and  121 . Thus, cool air may be supplied to the upper storage chamber  11  and the lower storage chamber  12  by driving of the fan. 
     The cool air generated in the evaporator units  112  and  122  may be supplied to the upper storage chamber  11  and the lower storage chamber  12  through outlets of the grill pan assemblies  113  and  123  by the operation of the fan and also be collected into inlets of the grill pan assemblies  113  and  123  to circulate. 
     Alternatively, only one evaporator unit  112  or  122  unit may be provided. Thus, the cool air discharged from one evaporator unit may be branched to be supplied into the upper storage chamber  11  or the lower storage chamber  12 . 
     The present embodiment may relate to a structure for cooling the lower storage chamber  12 . Hereinafter, the lower storage chamber  12  may be called a storage chamber, and the lower evaporator unit  122  may be called an evaporator unit. 
     The door  2  may be constituted by a rotation door  20  opening and closing the upper space through rotation thereof and a drawer door  30  opening and closing the lower space by being inserted or withdrawn in a drawer type. The lower space may be vertically divided again. The drawer door  30  may be constituted by an upper drawer door  30  and a lower drawer door  30 . Also, an outer appearance of each of the rotation door  20  and the drawer door  30  may be made of a metal material and be exposed to the front side. 
     Although the refrigerator in which all of the rotation door  20  and the drawer door  30  are provided is described, the present disclosure is not limited thereto. For example, the present disclosure may be applied to all refrigerators including a door that is inserted and withdrawn in the drawer type. Also, the rotation door  20  may be provided at an upper portion and thus called an upper door, and the drawer door  30  may be provided at a lower portion and thus called a lower door. 
     A display  21  may be disposed on one side of a front surface of the rotation door  20 . Also, when the outer appearance of the door  2  is made of the metal material, a plurality of fine holes are punched in the display  21  to display information by using light passing therethrough. 
     Also, a manipulation part  22  that is capable of manipulating automatic rotation or withdrawal of the upper door  2  or the lower door  2  may be provided on one side of the rotation door  20 . The manipulation part  22  may be integrated with the display  21  and may operate in a touch manner or a button manner. The manipulation part  22  may input an overall operation of the refrigerator  1  and manipulate an insertion and withdrawal of the drawer door  30  or an elevation within the drawer door. 
     A manipulation part  301  may also be provided on the drawer door  30 . The manipulation part  301  may be disposed on one side of the drawer door  30  that is disposed at the lowermost portion of the drawer door  30 . The manipulation part  301  may operate in a touch or button manner. The manipulation part  301  may be provided as a sensor detecting proximity or movement of the user or provided as an input unit that operates by a user&#39;s motion or voice. 
     As illustrated in the drawing, a manipulation device  302  may be disposed on a lower end of the lower drawer door  30  to illuminate an image on a bottom surface and thereby to output a virtual switch and to input an operation in such a manner that the user approaches a corresponding area. 
     The lower drawer door  30  may be automatically inserted and withdrawn according to the manipulation of the manipulation part  301 . Also, a food or container within the lower drawer door  30  may be elevated in a state in which the drawer door  30  is withdrawn by the manipulation of the manipulation part  301 . 
     The lower drawer door  30  may be a storage chamber defined in a lower side of the refrigerator  1  and may withdraw the lower drawer door  30  forward to accommodate a food stored in the lower drawer door  30 , and then, the container  36  inside the drawer door  30  may be manipulated to be elevated. 
     The container  36  may have a predetermined height. Since the container  36  is seated on the elevation device  80 , the height of the container  36  may increase by the height of the elevation device  80  when the elevation device  80  is elevated. Thus, when the elevation device  80  ascends, the container  36  may be disposed at a point at which the user is easily accessed to the container  36  and also easily lift the container  36 . 
     Thus, the container  326  may be completely accommodated in the accommodation part  32  when the drawer door  30  is inserted and withdrawn. When the elevation device ascends, the container  36  may be disposed at a higher position than the lower storage chamber  12 . 
     Although the shape of the container  36  is not limited, the container  36  may have a shape corresponding to the size of the front space S 1  and may have a predetermined height to prevent the stored food from being separated when the elevation device  80  ascends. 
     The food or container  36  inside the lower drawer door  30  disposed at the lowest position may be more easily lifted and used through the above-described manipulation. 
     The lower drawer door  30  may be automatically inserted and withdrawn forward and backward by the draw-out motor  14 , the pinion  141  provided in the cabinet  10 , and the draw-out rack  34  provided on the bottom surface of the lower drawer door  30 . 
     Also, the container inside the lower drawer door  30  may be elevated by the driving device  40  and the elevation device  80  provided in the lower drawer door  30 . 
     Hereinafter, the lower drawer door  30  and an operation of the lower drawer door  30  will be described in more detail, and also, the lower drawer door  30  will be called a drawer door or a door unless otherwise specified. 
     The embodiments are not limited to the number and shape of the drawer doors and may be applied to all refrigerators having a door that is inserted and withdrawn in a drawer type into/from the lower storage chamber. 
       FIG.  3    is a perspective view illustrating a state in which the container of the drawer door is separated. Also,  FIG.  4    is an exploded perspective view illustrating a state in which the drawer part of the drawer door and the door part are separated from each other when viewed from a front side. 
     As illustrated in the drawings, the drawer door  30  may include a door part  31  opening and closing the storage space and a drawer part  32  coupled to a rear surface of the door part  31  and inserted and withdrawn together with the door part  31 . 
     The door part  31  may be exposed to the outside of the cabinet  10  to define an outer appearance of the refrigerator  1 , and the drawer part  32  may be disposed inside the cabinet  10  to define a storage space. Also, the door part  31  and the drawer part  32  may be coupled to each other and inserted and withdrawn forward and backward together with each other. 
     The drawer part  32  may be disposed on the rear surface of the door part  31  to define a space in which the food or container to be stored is accommodated. The inside of the drawer part  32  may provide an upwardly opened storage chamber, and an outer appearance of the drawer part  32  may be defined by a plurality of plates (see reference numerals  391 ,  392 , and  395  in  FIG.  20   ). Each of the plurality of plates  391 ,  392 , and  395  may be made of a metal material and provided inside and outside the drawer part  32  so that the entire drawer part  32  is made of stainless steel or a material having a texture such as stainless steel. 
     In the state in which the drawer door  30  is inserted, a machine room  3  in which a compressor and a condenser constituting a refrigeration cycle are provided may be disposed behind the drawer door  30 . Thus, a rear end of the drawer part  32  may have a shape of which an upper end further protrudes from a lower end, and an inclined surface  321  may be provided on a rear surface of the drawer part  32 . 
     Also, a draw-out rail  33  guiding the insertion and withdrawal of the drawer door  30  may be provided on each of both side surfaces of the drawer part  32 . The drawer door  30  may be mounted to be inserted into or withdrawn from the cabinet  10  by the draw-out rail  33 . The draw-out rail  33  may be covered by an outer side plate  391  and thus may not be exposed to the outside. The draw-out rail  33  may have a rail structure that is capable of extending in multistage. 
     A rail bracket  331  may be provided in the draw-out rail  33 , and the rail bracket  331  may extend from one side of the draw-out rail  33  to both sides of the drawer part  32 . Also, the rail bracket  331  may be fixedly coupled to a sidewall surface inside the refrigerator. Thus, the drawer part  32 , that is, the drawer door  30 , may be mounted to the cabinet  10  by the draw-out rails  33 . 
     Also, the draw-out rail  33  may be provided on a lower end of each of both the side surfaces of the drawer part  32 . Thus, it may be understood that the draw-out rail  33  is disposed on the bottom surface of the drawer part  32 . Thus, the draw-out rail  33  may be provided at a lower ends of each of both sides of the drawer part  32  and may be called an under rail. 
     A draw-out rack  34  may be disposed on the bottom surface of th drawer part  32 . The draw-out rack  34  may be disposed on each of both sides and be interlocked with an operation of a draw-out motor  14  mounted on the cabinet  10  to automatically insert and withdraw the drawer door  30 . That is, when an operation is inputted into the manipulation parts  22  and  301 , the draw-out motor  14  may be driven to insert and withdraw the drawer door  30  according to movement of the draw-out rack  34 . Here, the drawer door  30  may be stably inserted and withdrawn by the draw-out rail  33 . 
     The draw-out rack  34  may not be provided on the drawer part  32 . Here, the user may hold a side of the door part  31  to push and pull the door part  31  so that the drawer door  30  is directly inserted and withdrawn. 
     The inside of the drawer part  32  may be divided into a front space S 1  and a rear space S 2 . The elevation device  80  that is vertically elevated and a container seated on the elevation device  80  to be elevated together with the elevation device  80  may be disposed in the front space S 1 . Although the container  36  is illustrated in the form of a basket having an opened upper portion, the container  36  may have a closed box structure such as a kimchi box. Also, a plurality of containers  36  may be stacked or arranged in parallel to each other. 
     Also, when the drawer door  30  is withdrawn, the entire drawer part  32  may not be withdrawn to the outside of the storage space due to a limitation in draw-out distance of the drawer door  30 . That is, at least the front space S 1  is withdrawn to the outside of the storage space, and the whole or a portion of the rear space S 2  is disposed inside the storage space within the cabinet  10 . 
     In such a structure, a draw-out distance of the drawer door  30  may be limited by the draw-out rack  34  or the draw-out rail  33 . As the draw-out distance becomes longer, the moment applied to the drawer door  30  may become larger in the draw-out state, and thus it is difficult to maintain a stable state, and the deformation or damage of the draw-out rail  33  or the draw-out rack  34  may occur. 
     The elevation device  80  and the container  36  may be accommodated in the front space S 1 . While the elevation device is elevated, the food or container  36  seated on the elevation device  80  may be elevated together. Also, the elevation device  80  may be provided below the container  36 , and the elevation device  80  may be covered by the container  36  when the container  36  is mounted. Thus, any constituent of the elevation device  80  will not be exposed to the outside. 
     A separate drawer cover  37  may be provided in the rear space S 2 . The front space S 1  and the rear space S 2  may be partitioned by the drawer cover  37 . In a state in which the drawer cover  37  is mounted, a space in which front and top surfaces of the rear space S 2  are covered and not be used may be not be exposed to the outside. 
     However, when the drawer cover  37  is separated, the user may be accessible to the rear space S 2 , and thus, foods may be easily accommodated in the rear space S 2 . To utilize the rear space S 2 , a separate pocket or a container corresponding to the shape of the rear space may be disposed in the rear space S 2 . 
     Also, the elevation device  80  inside the drawer part  32  may be simply separated and mounted to utilize the entire space inside the drawer part  32 , and the elevation device  80  and the drawer cover  37  may be separated from each other to utilize the entire space of the drawer part  32 . 
     The outer appearance of each of the inner and outer surfaces of the drawer part  32  may be defined by the separate plates  391 ,  392  and  395 , which cover the components mounted on the drawer part  32 , and thus, the outer and inner appearances may be seen to be neat. The plates  391 ,  392 , and  395  may be constituted by a plurality of plates and may be made of stainless steel to provide a more luxurious and clean appearance. 
     As illustrated in the drawings, the door part  31  and the drawer part  32  constituting the drawer door  30  may be coupled to be separated from each other. Thus, assembling workability and serviceability may be improved through the separable structure of the door part  31  and the drawer part  32 . 
     A rear surface of the door part  31  and a front surface of the drawer part  32  may be coupled to each other. When the door part  31  and the drawer part  32  are coupled to each other, power for the elevation of the elevation device  80  may be provided. The driving device  40  for elevating the elevation device  80  may be disposed on the door part  31 , and the door part  31  and the drawer part  32  may be selectively connected to each other. Thus, the elevation device  40  may be called an elevation driving device. 
     Particularly, the driving part  40  provided in the door part  31  may be configured to receive power from the power source and to transmit the power to the elevation part  80 . Thus, it is possible to remove the door part  31  when the service of the driving part  40  is necessary and to take measures simply by replacing only the door part  31 . 
     The door part  31  and the drawer part  32  may be coupled by a pair of door frames  316  provided on both sides. The door frame  316  includes a door coupling part  316   a  extending upward and downward to be coupled to the door part  31  and a drawer coupling part  316   b  extending backward from a lower end of the door coupling portion  316   a . The door coupling part  316   a  may be coupled to the door part  31  by a separate coupling member and may be coupled to one side of the door part  31  by a simple coupling structure. Also, the drawer coupling part  31   b  may be mounted on each of both sides of the drawer part  32  and be inserted and mounted in a state of being coupled to the draw-out rail  33 . The drawer coupling part  316   b  and the draw-out rail  33  may be covered by the plate  391  mounted on the drawer part  32  and thus may not be exposed to the outside. 
     Also, a connecting assembly  70  may be provided on the rear surface of the drawer door  30  so that the driving part  40  and the elevation are  80  are connected to each other when the door part  31  and the drawer part  32  are coupled. A drawer opening  35  through which a part of the elevation device  80  is exposed may be defined in a position corresponding to the connecting assembly  70  on the front surface of the drawer part  32 . 
     The door part  31  may be configured to substantially open and close the storage chamber of the cabinet  10  and to define the front surface of the refrigerator  1 . 
     The door part  31  may have an outer appearance that is defined by an outer case  311  defining a front surface and a portion of a circumferential surface, a door liner  314  defining a rear surface, and an upper deco  312  and a lower deco  313  which respectively define top and bottom surfaces. Also, an insulation material  300  may be filled in the inside of the door part  31  between an outer case  311  and a door liner  314 . 
     Hereinafter, a structure of the door part  31  constituting the drawer door  30  will be described in more detail. 
       FIG.  5    is a view illustrating a rear surface of the door part. Also,  FIG.  6    is a rear view illustrating a state in which a door cover of the door part is removed. Also,  FIG.  7    is an exploded perspective view of the door part. 
     As illustrated in the drawings, a front surface of the door part  31  may be defined by the outer plate  311 , and a rear surface may be defined by the door liner  314 . Also, a driving device  40  for operating the elevation device  80  may be provided inside the door part  31 . Although the driving device  40  may be disposed inside the door part  31 , the driving device  40  but is not embedded in the insulation material  300  but is disposed inside a recessed space of the door liner  314 . Then, the driving device  40  may be covered by the door cover  315  and thus may not be exposed to the outside. 
     In detail, the insulating material  300  may be filled between the outer plate  311  and the door liner  314  to insulate the inside of the storage chamber  12 . Also, the door liner  314  may have a door recess part  314   a  that is recessed inward. The door recess part  314   a  may have a shape corresponding to that of the driving device  40 . Thus, the door recess part  314  may have a shape corresponding to that of each of the constituents of the elevation device  80  so that the entire driving device  40  is inserted into the internal space of the drawer door  30 . 
     Also, a lighting recess part  314   b  may be disposed in the upper portion of the rear surface of the door part  31 , i.e., the upper portion of the door liner  314 . The lighting unit  318  may be mounted in the lighting recess part  314   b . The lighting unit  318  may be disposed above an opened top surface of the drawer part  32  to emit light to the inside of the drawer part  32  at the front side of the drawer part  32 , thereby illuminating the inside of the drawer part  32 . 
     In detail, the lighting unit  318  may be defined to be long in the lateral direction from the left side to the right side of the rear surface of the drawer door  30  and may be disposed at the uppermost position of the inner side regions of a gaskets  317  disposed along the rear surface of the drawer door  30 . 
     The driving device  40  may be mounted in the door recess part  314   a  disposed below the lighting unit. The driving device  40  may be covered by the door cover  315  in the state of being mounted in the door recess part  314   a . Alternatively, the door cover  315  may be omitted. When the door cover  315  is omitted, the front surface of the drawer part  32  may cover the driving device  40 . 
     The driving device  40  may be connected to the elevation device  80  provided in the drawer part  32  by the connecting assembly  70 . Thus, power of the driving device  40  may be transmitted to the elevation device through the connecting assembly  70 . Here, power having the same intensity may be transmitted to both sides of the elevation device  80  through the connecting assemblies  70  disposed on both sides at the same time. Thus, the elevation device  80  may ascend and descend in the horizontal state at both left and right sides without being tilted or biased to one side under any situation. 
     The door cover  315  defining a portion of an outer appearance of the rear surface of the door part  31  may be mounted on the rear surface of the door part  31 . The door cover  315  may cover the driving device  40  mounted on the door part  31 . The door cover  315  may have a plate shape to cover the driving device  40  so that the door cover  315  is not exposed in the driving device  40  is mounted. Here, the door cover  315  may have a shape that protrudes or is recessed at a position corresponding to the driving device  40 . 
     Also, the door cover  315  may be spaced apart from at least a portion of the door liner  314  in the state of being mounted on the rear surface of the door part  31 . Thus, the cool air may be supplied therein to cool the driving device. 
     Also, an upper end  315   a  of the door cover  315  may contact the door liner  314  to cover a portion of the lighting unit  318 . Here, a portion of an upper portion of the lighting unit  318  may be exposed. Thus, a space in which light is emitted into the drawer part  32  may be secured. 
     Also, the upper end  315   a  of the door cover  315  may contact the lighting unit  318 . Thus, when the cool air of the lower storage chamber  12  flows to the lighting unit  318 , the cool air may flow along the door cover  315  via the lighting unit  318 . 
     The door opening  315   c  may be defined in each of both left and right sides of the lower portion of the door cover  315 . The door opening  315   c  may be defined so that a portion of the connecting assembly  70  passes through the door opening  315   e  to protrude from the rear surface of the door part  31 . Also, the door opening  315   c  may have a corresponding shape at a position facing the drawer opening  35 . Thus, a portion of the connecting assembly  70  exposed through the door opening  315   c  when the door part  31  and the drawer part  32  are coupled may be coupled to the elevation device  80  to transmit the power 
     Also, a push part  741  of the connecting assembly  70  may be exposed through the door opening  315   c . The user may manipulate the push part  741  exposed to the rear surface of the door part  31  to selectively couple or separate the driving device  40  to/from the elevation device  80 . 
     A door gasket  317  may be provided along the rear surface of the door part  31 . When the drawer door  30  is closed, the door gasket  317  may airtightly contact the front surface of the cabinet  10  in the state in which the drawer door  30  is closed. 
       FIG.  8    is an exploded perspective view illustrating a coupling structure between the door part and the wiring guider. 
     As illustrated in the drawings, the rear surface of the door part  31  may be defined by the door cover  315 . Also, a connecting hole  315   d  may be defined in a lower end of the door cover  315 . The connecting hole  315   d  may be a portion to which a front end of the wiring guider  90 , which will be described below, is connected and may be configured so that a lower end of the door cover  315  is opened. 
     Also, a door-side connector  319  may be provided inside the connecting hole  315   d . The door-side connector  319  may be connected to wirings connected to the electronic components provided inside the door part  31 . The electronic components connected to the door-side connector  319  may include the driving device  40 , the door light  318 , an elevation detection device  16  for detecting the elevation of the elevation device  80 , a sensor, and the like. Also, the electronic components may further include other constituents provided inside the door part  31  and requiring power connection. 
     The door-side connector  319  may be connected to the guide-side connector  961  disposed inside the wiring guider  90  when the front end of the wiring guider  90  is inserted into and mounted in the connecting hole  315   d . Thus, the wiring guider  90  may be electrically connected to the electronic components provided inside the door part  31  by only mounting the wiring guider  90  on the rear surface of the door part  31  without separate wiring connection. 
     Here, the connecting hole  315   d  may have a shape corresponding to that of the front end of the wiring guider  90 . Thus, the wiring guider  90  may be coupled always in an correct direction. 
     The wiring guider  90  may be fixed and mounted inside the cabinet  10  and be connected to the door part  31 . Also, the wiring guider  90  may generally include a cover plate  91 , a guide head  92 , a plurality of flexible portions  93 , a rotation connection member  94 , and a mounting plate  95 . 
       FIG.  9    is a view illustrating a state in which the wiring guider is mounted on the cabinet of the refrigerator. Also,  FIG.  10    is a cross-sectional view illustrating an arrangement of the draw-out driving device for inserting and withdrawing the door part. 
     The wiring guider  90  may be disposed on a front end of bottom surface of the lower storage chamber  12 . Also, the wiring guider  90  may be connected to the rear surface of the door part  31  and be inserted and withdrawn together with the drawer door  30  when the drawer door  30  is inserted and withdrawn. Also, a wiring  962  may be disposed inside the wiring guider  90 . The wiring  962  may be guided up to the door part  31  along the wiring guider  90 . 
     Hereinafter, constituents of each of the cover plate  91 , the guide head  92 , the flexible portions  93 , the rotation connection member  94 , and the mounting plate  95 , which constitute the wiring guider  90 , will be described in more detail. 
     Here, the cover plate  91  may be one component of a draw-out driving device  140  that will be described below. The draw-out driving deice  140  and the wiring guider  90  may be provided as one assembly. 
     That is, the draw-out driving device  140  may be provided in the wiring guider  90  including the cover plate  91 . Alternatively, the wiring guider  90  may be mounted on the draw-out driving device  140  including the cover plate  91 . 
     In addition, the wiring guider  90  and the draw-out driving device  140  may be understood as a concept of one assembly including a plurality of components mounted on the base cover  102   a  and the cover plate  91 . 
     The cover plate  91  may be disposed on the bottom surface of the lower storage chamber  12 . That is, a cabinet opening  101   a  into which the draw-out driving device  140  is mounted may be defined in an inner case  101  defining the lower storage chamber  12 , and the cover plate  91  may cover the cabinet opening  101   a.    
     The draw-out driving device  140  may be mounted inside the cabinet  10  in the form of a module and covered by the cover plate  91 . As necessary, the cabinet opening  101   a  may be opened to pass through a bottom surface of the cabinet  10 . Also, the cover plate  91  may be disposed inside the lower storage chamber  12  corresponding to the cabinet opening  101   a . The separate base cover  102   a  may be provided outside the outer case  102  so that the draw-out driving device  140  is disposed in an inner space of the cabinet opening  101   a.    
     The cover plate  91  may have a plate shape that covers the cabinet opening  101   a  on a whole. The cover plate  91  may be injection-molded by using a plastic material so that the draw-out driving device  140  is accommodated. Also, the cover plate  91  may have a plurality of protruding or recessed portions so that a plurality of constitutes in addition to the draw-out driving device  140  are disposed. 
     In detail, a motor accommodation part  911  in which the draw-out motor  14  is disposed may be defined in one side of the cover plate  91 . The motor accommodation part  911  may protrude upward and have a shape corresponding to that of the draw-out motor  14  to provide a space in which the draw-out motor  14  is accommodated therein. 
     Also, a pinion opening  912  through which a pinion  141  rotating by the draw-out motor  14  may be defined in each of both left and right sides of the cover plate  91 . A portion of the pinion  141  may be exposed to the lower storage chamber  12  through the pinion opening  912 . 
     Also, although not shown in detail, a rack restriction device  913   a  for selectively restricting an draw-out rack  34  disposed on each of both side surfaces of the bottom surface of the drawer part  32  may be mounted at a rear side of the pinion opening  912 . The rack restriction device  913   a  selectively restrict a portion of the draw-out rack so that the draw-out racks  34  arranged in two stages are sequentially inserted and withdrawn. 
     A restriction device mounting part  913  on which the rack restriction device  913   a  is mounted may be recessed at a rear side of the pinion opening  912 . The rack restriction device  913   a  may be defined in a position corresponding to a lower side of the draw-out rack  34  and protrude upward to be coupled to a portion of the draw-out rack  34 . 
     A detection device mounting part  915  on which the draw-out detection device  15  is mounted may be disposed at one side of both left and right sides of the pinion opening  912 . The detection device mounting part  915  may be configured to detect the inserted and withdrawn state of the drawer part  32  and be disposed at one side of the cover plate  91  corresponding to the bottom surface of the drawer part  32 . 
     The draw-out detection device  15  may be provided as a hall sensor detecting a magnet. The draw-out detection device  15  may detect magnets  389  disposed at front and rear portions of the bottom surface of the drawer part  32  to determine whether the drawer door  30  is inserted or withdrawn. Alternatively, the draw-out detection device  15  may be provided as a detection sensor or a switching structure, which is different from the hall sensor. For example, the draw-out detection device  15  may be provided as various electric devices that are capable of detecting the position of the drawer part  32 . 
     The detection device mounting part  915  may have a groove shape that is opened or recessed. At least a portion of the draw-out detection device  15  may be exposed upward to detect an operation of the drawer part  32 . 
     A rotation shaft guide  916  may be disposed between the pinion openings  912 . The rotation shaft guide  916  may protrude downward to guide the pinion rotation shaft  142  connecting the motor accommodation part  911  to the pinion  141 . 
     The pinion rotation shaft  142  may pass through the draw-out motor  14  or be connected to a rotation shaft of the draw-out motor  14 . The pinion rotation shaft  142  may be respectively connected to central portions of the pinions disposed at both sides thereof. Thus, both the pinions  141  may rotate together with each other by the rotation of the draw-out motor  14 . In the state of being coupled to the draw-out rack  34 , both sides of the drawer  32  may move forward and backward at the same time. 
     As illustrated in  FIG.  12   , the pair of rotation shaft guides  916  may horizontally extend to be spaced apart from each other. Also, the pinion rotation shaft  142  may be disposed to pass between the pair of rotation shaft guides  916 . That is, each of the rotation shaft guides  916  may extend downward from the front and rear direction of the pinion rotation shaft  142  to prevent the pinion rotation shaft  142  from moving or being separated from a fixed position. Also, a rotation connection member  94  that will be described below may partition a space so as not to interfere with the pinion  141 . 
     A mounting plate  95  may be mounted on one side of the cover plate  91 . The rotation connection member  94  may be rotatably mounted on the mounting plate  95 . The mounting plate  95  may be disposed at a position that is leaned from a center of the cover plate  91  to one side of the cover plate  91 . 
     Thus, the guide head  92  may be disposed at a center of the rear surface of the door part  31 . The mounting plate  95  and the rotation connection member  94  may be disposed at a side of the guide head  92 , and the guide head  92  and the rotation connection member  94  may be connected to each other by the flexible portion  93 . 
     A structure that is capable of accommodating the draw-out driving device  140  by the cabinet opening  101   a , the base cover  102   a , and the cover plate  91  may be provided in the bottom surface of the cabinet  10 . That is, the draw-out motor  14 , the pinion rotation shaft  142 , and the pinion  141  may be disposed inside a space defined by the cover plate  91  and the base cover  102   a  and be accommodated in an accommodation space between an outer surface and an inner surface of the cabinet  10 . As described above, the draw-out driving device  140  may be disposed on an inner area of the bottom surface of the cabinet to minimize a volume loss of the lower storage chamber  12 . 
     Also, an electric device in addition to the draw-out detection device  15  may be further disposed inside the accommodation space. Also, a wiring  962  supplying power to the drawer door  30  may also be disposed in the accommodation space. The wiring  962  may be guided to the drawer door  30  through the wiring guider  90 . 
     Hereinafter, the constituents of the wiring guider  90  will now be described in more detail with reference to the accompanying drawings. 
       FIG.  11    is an exploded perspective view of the wiring guider when viewed from an upper side. Also,  FIG.  12    is an exploded perspective view of the wiring guider when viewed from a lower side. 
     As illustrated in the drawings, the wiring guider  90  includes a cover plate  91 , a mounting plate  95  fixed to the cover plate  91 , a rotation connection member rotatably mounted on the mounting plate  95 , a guide head  92  fixed to the rear surface of the door part  31 , and a plurality of flexible portions  93  connecting the rotation connection member  94  to the guide head  92 . 
     In more detail, the mounting plate  95  may be mounted on a top surface of the cover plate  91 . The mounting plate  95  may have a plate shape to cover a wiring inlet hole  914  of the cover plate  91 . 
     The wiring inlet hole  914  may pass through the cover plate  91  so that the wiring  962  guided to the inside of the wiring guider  90  is accessible. Also, the wiring inlet hole  914  may include a first opening  914   a  and a second opening  914   b.    
     The first opening  914   a  may have a size greater than that of the second opening  914   b  and have a circular shape corresponding to a diameter of the rotation connection member  94 . Here, the size of the first opening  914   a  may correspond to that of the connection member stepped part  942 . Thus, the connection member restriction part  943  protruding from the connection member stepped part  942  may be hooked and restricted to an outer end of the first opening  914   a.    
     Also, the second opening  914   b  may communicate with the first opening  914   a . The second opening  914   b  may extend from one side of the first opening  914   a . Here, the second opening  914   b  may have a width corresponding to that of the connection member restriction part  943 . 
     Thus, the rotation connection member  94  may be inserted into the wiring inlet hole  914 . Here, the connection member restriction part  943  may pass through the second opening  914   b , and the connection member stepped part  942  may pass through the first opening  914   a . Also, in the state in which the rotation connection member  94  is mounted, when the rotation connection member  94  rotates, the connection member restriction member  943  may interfere with a circumference of the first opening  914   a  to prevent the rotation connection member  94  from being separated. 
     The mounting plate  95  may have a size that is enough to cover all the first opening  914   a  and the second opening  914   b . Also, a screw hole  953  to which a screw is coupled may be defined in each of both left and right sides of the mounting plate  95 . The screw passing through the screw hole  953  may be coupled to the cover plate to fix the mounting plate  95  and the rotation connection member  94  mounted on the mounting plate  95 . 
     A mounting opening  951  may be defined in a center of the mounting plate  95 . Also, the rotation connection member  94  may be mounted on the mounting opening  951 . A stepped portion accommodation part  952  protruding upward is provided around the mounting opening  951 . A bottom surface of the stepped portion accommodation part  952  may be stepped to accommodate a circumference of the rotation connection member  94 , more particularly, the connection member stepped part  942 . 
     The rotation connection member  94  may be rotatably mounted on the mounting plate  95  and have a hollow inner side. Thus, the wiring  962  may be guided toward the flexible portion  93  along the inside of the rotation connection member  94 . 
     The rotation connection member  94  may have an opened bottom surface. The connection member stepped part  942  may be disposed around the opened bottom surface of the rotation connection member  94 . The connection member stepped part  942  may have a diameter greater than an inner diameter of the mounting opening  951 . Also, the connection member stepped part  942  may be accommodated into the stepped portion of the stepped portion accommodation part  952 . Thus, in the state in which the rotation connection member  94  is mounted on the mounting plate  95 , the rotation connection member  94  may be freely rotatable without being separated. 
     Also, the connection member restriction part  943  extending outward may be disposed on one end of the connection member stepped part  942 . The connection member restriction part  943  may protrude downward from the top surface of the connection member stepped part  942  and also extend in one side direction. 
     Here, the connection member restriction part  943  may extend to be restricted with the bottom surfaces of the mounting plate  95  and the cover plate  91 . That is, the connection member restriction part  943  may extend up to the outside of the first opening  914   a . Thus, the rotation connection member  94  may not be easily separated in the state of being restricted with the cover plate  91  and the mounting plate  95  even though strong force is applied to the rotation connection member  94 . 
     To mount and separate the rotation connection member  94 , the connection member restriction part  943  may be aligned with the second opening  914   b  to insert or withdraw the rotation connection member  94  into/from the cover plate  91 . Also, in the state in which the rotation connection member  94  is inserted into the wiring inlet hole  914 , the mounting plate  95  may be coupled to allow the rotation connection member  94  to be mounted. 
     An opening  940   b  that is opened backward may be defined in an upper end of the rotation connection member  94 . Thus, the wiring  962  introduced through the opening  940   a  of the bottom surface of the rotation connection member  94  may be guided to the inside of the flexible portion  93  through the opening  940   a  defined in the upper portion of the rotation connection member  94 . A connection member connection part  941  may extend backward from each of upper and lower ends of the opening  940   b  defined in the upper portion of the rotation connection member  94 . The connection member connection parts  941  may be vertically spaced apart from each other and also horizontally extend to be coupled to one end of the flexible portion  93 . 
     Also, connection protrusions  941   a  respectively protruding upward and downward may be respectively disposed on the connection member connection parts  941  that are vertically disposed. Each of the connection protrusions may be axially coupled to one end of the flexible portion  93 . Thus, the flexible portion  93  may rotate by using the connection protrusion  941   a  of the connection member connection part  941  as an axis. 
     The plurality of flexible portions  93  may be continuously connected to each other. Also, each of the flexible portions  93  may be connected from the rotation connection member  94  to the guide head  92 . The plurality of flexible portions  93  connected to each other may have the same shape and be continuously connected to be rotatable. Thus, the structure in which the flexible portions  93  are coupled to each other may have a structure such as a chain. Also, the wiring  962  may sequentially pass through the insides of the flexible portions  93  so as to be guided from the rotation connection member  94  to the guide head  92 . 
     In details of the flexible portion  93 , the flexible portion  93  may have a box shape of which the inside is hollowed forward and backward. Also, a front surface (a left surface in  FIG.  11   ) and a rear surface of the flexible portion  93  may be opened so that the wiring  962  passes therethrough. 
     A front connection part  934  may extend forward from each of upper and lower ends of the opened front surface of the flexible portion  93 . The front connection part  934  may have a shape that further extends from each of the top and bottom surfaces of the flexible portion  93  and have a rounded end. Also, a connection hole  934   a  may be opened in the front connection part  934 . 
     Also, a front extension part  936  may be further disposed between the front connection parts  934 , i.e., at one end of the opened front surface of the flexible portion  93 . The front extension part  936  may extend to further protrude from the other facing side surface. Thus, the front extension part  936  may restrict the rotation of the flexible portion  93  in one direction so that the flexible portion  93  rotates with directivity. 
     The front connection part  934  of the flexible portion  93  connected to an end of the rotation connection member  94  among the plurality of flexible portions  93  may be coupled to the connection member connection part  941 . Also, the connection protrusion  941   a  may be inserted into the connection hole  934   a  so that the flexible portion  93  and the rotation connection member  94  rotate together with each other. The connection member connection part  941  of the rotation connection member  94  may have the same structure as a rear connection part  933 . 
     Also, the rear connection part  933  may extend backward from each of the upper and lower ends of the opened front surface of the flexible portion  93 . The rear connection part  933  may have a shape that further extends from each of the top and bottom surfaces of the flexible portion  93 . Also, a rear protrusion  933   a  that protrudes may be disposed on each of top and bottom surfaces of the pair of rear connection parts  933 . The rear protrusion  933   a  may be inserted into the connection hole  934   a  of the flexible portion  93  that is adjacent thereto. 
     Here, each of the top and bottom surfaces of the rear connection part  933  may be stepped to correspond to the front connection part  934 . Thus, the front connection part  934  may be mounted to overlap the top surface of the rear connection part  933 . Also, the stepped portion of the rear connection part  933  may be rounded like the end of the front connection part  934  so that the flexible portions  93  connected to each other are ratable together. 
     Also, a rear extension part  935  may be further disposed between the rear connection parts  933 , i.e., at one end of the opened rear surface of the flexible portion  93 . The rear extension part  935  may further protrude from the other facing side surface. Thus, the rear extension part  935  may restrict the rotation of the flexible portion  93  in one direction so that the flexible portion  93  rotates with directivity. Also, the rear extension part  935  may be disposed on the same plane as the front extension part  936  so that the flexible portions  93  connected to each other are disposed with directivity to rotate. 
     The plurality of flexible portions  93  may have a structure in which the flexible portions  93  are continuously connected to each other. The plurality of flexible portions  93  may be continuously connected to each other backward to extend. Thereafter, the plurality of flexible portions  93  may extend by a predetermined distance and then be continuously connected to each other forward. That is, in the state in which the plurality of flexible portions  93  are connected to each other, the plurality of flexible portions  93  may have a “U” shape on a whole, and the rotation connection member  94  and the guide head  92  may be connected to an extending end of each of the plurality of flexible portions  93 . In the state in which the plurality of flexible portions  93  are connected to each other, the portion extending in the straight lines on both sides may be referred to linear sections S 1  and S 2 , and the portions connecting the straight sections S 1  and S 2  on both the sides to each other may be referred to bent sections S 3 . 
     Here, the linear section S 1  connected to the guide head  92  may be maintained in length even though the drawer door  30  is inserted and withdrawn, i.e., may be maintained in the shape of  FIGS.  11  and  12   . On the other hand, the linear section S 2  connected to the rotation connection member  94  and the bent section S 3  may vary in length when the drawer door  30  is inserted and withdrawn. 
     Also, the total length of the plurality of flexible portions  93  may be greater than the draw-out distance of the drawer part  30 . Thus, the wiring  962  may be stably guided to the drawer door  30 . 
     The guide head  92  may be connected to one end of the flexible portion  93 . The guide head  92  may be disposed at a center of the door part  31  in the horizontal direction and be inserted into a connecting hole  315   d  defined in the door part  31 . 
     The guide head  92  may have an opened front surface. A connector accommodation space  920  in which the guide-side connector  961  is accommodated may be defined in the guide head  92 . The opened front surface of the guide head  92  may have a shape corresponding to the flexible portion  93 . 
     Also, a fixing slot  921  that is cut backward may be defined in each of upper and lower ends of the opened front surface of the guide head  92 . The fixing protrusions  319   a  and  319   b  disposed on the door-side connector  319  may be inserted into the fixing slots  921 , respectively. The fixing protrusions  319   a  and  319   b  may be disposed inside the connecting hole  315   d  or disposed on the door-side connector  319 . Thus, while the guide head  92  is inserted into the connecting hole  315   d , the fixing protrusions  319   a  and  319   b  and the fixing slots  921  may be coupled to each other. 
     The fixing slots  921  may include an upper slot  921   a  defined in a top surface of the guide head  92  and a lower slot  921   b  defined in a bottom surface of the guide head  92 . Also, the upper slot  921   a  and the lower slot  921   b  may be defined in the center of the guide head  92 . Also, the upper slot  921   a  and the lower slot  921   b  may have widths different from each other to prevent the guide head  92  from being incorrectly coupled to each other. 
     A head coupling hole  922  may be defined in one side of a front surface of the guide head  92 . A screw may be coupled to the head coupling hole  922 . The screw may pass through the head coupling hole  922  and then be coupled to the rear surface of the door part  31 . The guide head  92  may be more firmly fixed to the rear surface of the door part  31  by the coupling of the screw. 
     Also, head support parts  923   a  and  923   b  may be disposed on the top and bottom surfaces of the guide head  92 , respectively. The head support parts  923   a  and  923   b  may contact the inside of the connecting hole  315   d  to support the guide head  92  in the state of being inserted into the guide head  92 . Thus, even though the drawer door  30  is repeatedly inserted and withdrawn, the stably mounted state of the guide head  92  may be maintained. 
     The head support parts  923   a  and  923   b  may include an upper support part  923   a  on the top surface of the guide head  92  and a lower support  923   b  on the bottom surface of the guide head  92 . The upper support part  923   a  may be disposed on the top surface of the guide head  92 . The upper support part  923   a  may extend in the horizontal direction crossing the draw-out direction of the drawer door  30  and protrude by a predetermined height. Here, the upper support part  923   a  may be disposed at a position corresponding to the upper end of the connecting hole  315   d  in the state in which the guide head  92  is inserted. 
     The lower support part  923   b  may be disposed on the bottom surface of the guide head  92 . Also, the lower support part  923   b  may be provided in plurality, which extend in the draw-out direction of the drawer door  30 . The lower support parts  923   b  may be disposed to be spaced a predetermined distance from each other. When the guide head  92  is inserted, the lower support part  923   b  may contact the lower end of the connecting hole  315   d  to stably support the guide head  92 . 
     A head connection part  924  may be disposed on a rear end of the guide head  92 . The head connection part  924  may extend from a rear surface of the guide head  92 , and the inside of the head connection part  924  may communicate with the connector accommodation space  920 . Thus, the wiring  962  guided through the rotation connection member  94  may be guided to the inside of the guide head  92  through the head connection part  924 . Also, the guide-side connector  961  may be connected to an end of the wiring  962  introduced into the connector accommodation space  920 . 
     The head connection part  924  may extend backward from each of the opened upper and lower end of the rear end of the guide head  92 . Also, a head protrusion  924   a  may be disposed on each of the top and bottom surfaces of the head connection part  924 . The head connection part  924  may have the same shape as the rear connection part  933  of the flexible portion. Thus, the head connection part  924  may have a structure that is rotatably connected to the front connection part  934 . 
       FIG.  13    is a cross-sectional view of the wiring guider. 
     As illustrated in the drawings, in the state in which the wiring guider  90  is assembled, the wiring  962  guided to the bottom surface of the cabinet  10  may be guided to the rotation connection member  94  via the cover plate  91  through the wiring inlet hole  914 . 
     The wiring  962  introduced into the rotation connection member  94  may be guided along the plurality of flexible portions  93  connected to each other. That is, the wiring  962  may be disposed in a U shape like the arranged shape of the flexible portions  93 . Also, when the flexible portion  93  is changed in position by the insertion and withdrawal of the drawer door  30 , the wiring  962  may move together with the flexible portion  93  in the state of being disposed in the flexible portion  93 . 
     The wiring  962  passing through the flexible portion  93  may be guided to the inside of the guide head  92  and be connected to the guide-side connector  961  inside the guide head  92 . When the guide head  92  is mounted on the rear surface of the door part  31 , the door-side connector  319  and the guide-side connector  961  may be coupled and connected to each other. That is, the wiring  962  within the cabinet  10  may be electrically connected to the electronic components within the door part  31  through the wiring guider  90  via the bottom of the cabinet  10 . 
       FIG.  14    is a cross-sectional view illustrating an arrangement of the driving device and the wiring guider of the drawer door. Also,  FIG.  15    is an enlarged view illustrating a portion A of  FIG.  14   . Also,  FIG.  16    is a cutaway perspective view illustrating an arrangement of the wirings within the wiring guider. 
     As illustrated in the drawing, the wiring guider  90  may be coupled to the rear surface of the door part  31 . The guide head  92  may be inserted into the connecting hole  315   d  and fixed to the door part  31 . 
     The connecting hole  315   d  may be disposed below the bottom surface of the drawer part  32 . That is, the connecting hole  315   d  may be disposed below the drawer part  32  to fix the guide head  92  to the door part  31 . 
     Also, the wiring guider  90  may be disposed below the drawer part  32 . Thus, even though the drawer door  30  is inserted or withdrawn, the wiring guider  90  may be maintained in the state of being connected to the door part  31  by passing through the lower side of the drawer part  32 . Thus, while the drawer door  30  is inserted and withdrawn, the wiring guider  90  may be covered by the drawer part  32  and thus may not be exposed to the user. 
     The door-side connector  319  may be connected to the electronic components provided inside the door part  31  such as the driving device  40 , the door light  318 , and the elevation detection device  16 . Thus, the wiring  962  guided through the wiring guider  90  may be electrically connected to the electronic components within the door part  31 . 
     Also, in the even state in which the drawer door  30  is completely withdrawn, the plurality of flexible portions  93  connected to each other may have a relatively long length so that the wiring  962  is connected to the door part  31 . Thus, in the state in which the plurality of flexible portions  93  are connected to each other, if only both ends of the flexible portions  93  are respectively connected to the rotation connection member  94  and the guide head  92 , the flexible portions may droop in the connected state. 
     To prevent this limitation from occurring, the flexible portion fixing part  932  may be disposed on the flexible portion  93 , which is disposed on the linear section S 1  from the portion connected to the guide head  92 , among the plurality of flexible portions  93 . Alternatively, the flexible portion fixing part  932  may be further disposed on the plurality of flexible portions  93  disposed on the linear section S 1  or may be further disposed on the flexible portions  93  disposed on the linear section S 1  that is not changed in position even though the drawer door is inserted and withdrawn. 
     Since the linear section S 1  corresponds to a length from an end of the guide head  92  to the bent section S 2  at which each of the flexible portions  93  is bent in the state in which the drawer door  30  is inserted and withdrawn, the linear section S 1  may be substantially maintained in the linear shape while the drawer door  30  is withdrawn. Thus, even though the flexible portion  93  is fixed to the bottom surface of the drawer part  32  by the flexible portion fixing part  932 , the insertion and withdrawal of the drawer door  30  or the guidance of the wiring  962  may not interfere. 
     The flexible portion fixing part  932  may have a structure in which a groove opened upward is defined. Thus, the flexible portion fixing part  932  may be coupled to a flexible portion coupling part  385  so that the flexible portion  93  and the bottom surface of the drawer part  32  are maintained to be spaced a predetermined distance from each other. 
     The flexible portion coupling part  385  may be disposed on the bottom surface of the drawer part  32  corresponding to the flexible portion fixing part  932 . The flexible portion coupling part  385  may include a connection rod  385   b  that is press-fitted into a groove defined in the flexible portion fixing part  932  and rod supporter  385   a  supporting both ends of the connection rod  385   b . The connection rod  385   b  may have a predetermined length so that the flexible portion  93  is movable within a region of the connection rod  385   b.    
     When the flexible portion fixing parts  932  is provided in plurality, the flexible portion coupling part  385  may also be provided in plurality at corresponding positions. Thus, when the drawer door  30  is repeatedly inserted or withdrawn, or the refrigerator  1  is used for a long time, the flexible portions  93  may be maintained at initial positions. Thus, the drawer door  30  may be prevented from interfering due to the looping or deformation of the flexible portions  93  when the drawer door  30  is inserted and withdrawn or may be smoothly inserted and withdrawn. 
     The driving device  40  may be driven by the wiring  962  guided by the wiring guider  90 , and the elevation device  80  within the drawer part  32  may be elevated by the operation of the driving device  40 . 
     Hereinafter, the constituents of the driving device  40  will now be described in more detail with reference to the accompanying drawings. 
       FIG.  17    is a perspective view of the driving device according to an embodiment. Also,  FIG.  18    is an exploded perspective view of the driving device. 
     As illustrated in the drawings, the driving device  40  may include a motor assembly  60 , a screw assembly  50  disposed on each of both sides of the motor assembly  60  and connected by a shaft  41 , a lever  42  connected to the screw assembly  50 , and the connecting assembly  70 . 
     In detail, the motor assembly  60  may be disposed at a center of each of the left and right sides of the door part  31 . Also, the driving device  40  may provide the power for elevating the elevation device  80 . The driving device  40  may allow both the screw assemblies  50  and the lever  42  to operate by the motor assembly including one driving motor  64 . 
     Particularly, the motor assembly  60  may adjust magnitude of the decelerated and transmitted force through a combination of the plurality of gears. Also, a shaft  41  passing through the motor assembly  60  from the left to the right, i.e., in a horizontal direction may be disposed on an upper end of the motor assembly  60 , and the plurality of gears may be combined in the motor assembly  60  for rotation of the shaft  41 . 
     Also, the motor assembly  60  may have a structure in which the driving motor  64  and the gears are arranged vertically to minimize a space recessed when the motor assembly  60  is mounted on the door part  31 , in particular, a width in the left and right direction is widened, and a thickness in the front and rear direction is minimized. Also, the driving motor  64  constituting the motor assembly  60  may protrude toward the drawer part  32  to minimize a depth of the door part  31  to secure insulation performance. 
     The shaft  41  may pass through the motor assembly  60  in the transverse direction and be coupled to the screw assembly  50  disposed at both sides of the motor assembly  60  so that the power of the motor assembly  60  is simultaneously to the screw assembly ( 50 ). Thus, the shaft  41  may be called a power transmission member. 
     For this, the shaft  41  may have a length such that both ends of the shaft  41  pass through the motor assembly  60  and are inserted into the screw assembly  50 . Also, a shaft driving gear  411  may be provided at a center of the shaft  41 . The shaft driving gear  411  may be coupled to the gears in the motor assembly  60  to rotate. Also, a shaft gear  412  may be disposed on each of both ends of the shaft  41 . The shaft gear  412  may have a structure that is coupled to the screw assembly  50 . The shaft gears  412  may have the same structure so that the same rotation force is applied to the shaft gears  412 . The screw assembly  50  may be transferred to the screw assembly  50  so that the screw assembly  50  operates simultaneously. 
     The screw assemblies  50  may be disposed on both sides of the motor assembly  60 . The upper end of the screw assembly  50  may be connected to the shaft  41  and also be gear-coupled to the shaft gear  412  to transmit the power so that the screw  52  rotates. A screw gear having a bevel gear shape gear-coupled to the shaft gear  412  may be further disposed on the screw  52 . 
     When the screw  52  rotates, a screw holder  56  may move along the screw  52 . Also, the lever  42  may be coupled to the screw holder  56  to allow the lever  42  to rotate according to the movement of the screw holder  56 . 
     For this, the upper end of the screw assembly  50  may be oriented outward, and the lower end of the screw assembly  50  may be inclined inward. Here, the screw assemblies  50  on both sides may be symmetrical to each other with respect to the motor assembly  60 . Thus, the motor assembly  60  may be disposed between the screw assemblies  50  located on both sides of the screw assembly  50 . The screw assembly  50  disposed on both sides of the motor assembly  60  may be provided so that a distance between the screw assemblies  50  gradually increases from the upper end to the lower end. 
     The screws  52  provided in the screw assembly  50  may be arranged in the same direction as the screw assembly  50 , and extension lines of the screws  52  on both the left and right sides may cross each other. Also, the screw holder  56  may move along the screw  52  according to the rotation of the screw  52 , and the lever  42  connected to the screw holder  56  may rotate along the connecting assembly  70 . The screw assembly  50 , the lever  42 , and the connecting assembly  70  may be symmetrical to each other so that the lever  42  simultaneously rotates at the same angle as the screw assembly  50  is driven. 
     The lever  42  may connect the screw holder  56  to the connecting assembly  70 . Thus, both ends of the lever  42  may be rotatably coupled to the screw holder  56  and the connecting assembly  70 , respectively. Thus, when the screw holder  56  linearly moves, the lever  42  may be rotatable about the connecting assembly  70 . 
     The connection assemblies  70  disposed on both the left and right sides may be connected to each other by a connector bracket  43 , and the connecting assembly  70  may be firmly supported on the door part  31  to effectively transmit the rotation force to the elevation device  80 . 
       FIG.  19    is an exploded perspective illustrating a coupling structure of a connecting assembly, which is one component of the driving device, and a lever. 
     As illustrated in the drawing, the lever  42  may be configured to connect the screw assembly  50  to the connecting assembly  70 . 
     In details of the structure of the lever  42 , the lever  42  may be provided in a rod or bar shape having a predetermined width and may extend from the rotation axis of the connecting assembly  70  to the holder protrusion  591  of the screw assembly  50 . 
     In detail, the lever  42  may include a first extension part  421  connected to the connecting assembly, a second extension part  423  connected to the screw holder  56 , and an intermediate portion  422  connecting the first extension part  421  to the second extension part  423 . 
     The first extension part  421  and the second extension part  423  may be disposed parallel to each other, and the intermediate portion  422  may have an inclination. Also, the first extension part  421  may be further backward than the second extension part  423  by the inclination of the intermediate part  422 . 
     The lever  42  may not be deformed or damaged even if a large amount of force is applied to the lever  42  due to the structure and shape of the bent lever  42 . Also, the lever  42  may be made of a metal material to realize the stable power transmission even when the elevation device  80  on which a heavy food is seated is elevated. 
     Also, the inclination of the intermediate portion  422  may allow the lever  42  to be connected between the connecting assembly  70  disposed relatively backward and the screw holder  56  disposed relatively forward. 
     A first lever hole  424  may be defined in the first extension part  421  to be connected to the lever fixing member  75  of the connecting assembly  70 . The first lever hole  424  may be formed in a polygonal shape corresponding to one side of the lever fixing member  75  and may be opened in a rectangular shape as illustrated in the drawing. The lever fixing member  75  may also rotate together when the lever  42  rotates. 
     Also, the lever protrusion  425  may be disposed on the first extension part  421 . The lever protrusion  425  may be spaced apart from the first lever hole  424  and disposed toward the intermediate part  422 . The lever protrusion  425  may be configured to be coupled to the connection member  73  of the connecting assembly  70 . That is, the rotation force of the lever  42  may be transmitted to the connecting assembly  70  by the lever protrusion  425  together with the first lever hole  424 . Furthermore, the rotation force may be transmitted to the elevation device  80  to elevate the elevation device  80 . 
     Also, a second lever hole  426  through which the holder protrusion  591  of the screw holder  56  is inserted may be defined in the second extension part  423 . The second lever hole  426  may have a size corresponding to the holder protrusion  591  and also may have a long hole shape in the extension direction of the second extension part  423  so that the holder protrusion  591  move as the screw holder  56  move vertically. Thus, the holder protrusion  591  may be disposed on the left end of the second lever hole  426  in a state in which the screw holder  56  is disposed at the lowest position, and as the screw holder  56  move upward, the protrusion  591  moves to the right side of the second lever hole  426  so that the lever  42  rotates. 
     The connecting assembly  70  may be provided at one end of the lever  42 , i.e., at a position corresponding to the first extension part  421 . A connection member  73  for connecting the lever  42  to the elevation device  80  may be rotatably mounted on the inside of the connecting assembly  70 . 
     The connection member  73  may be coupled to the lever fixing member  75  by the fixing shaft  77  and thus may rotate together with the rotation of the lever  42 . Also, the connection member  73  may be connected to the lever protrusion  425  and the scissors protrusion  841   b  to transmit greater force to the elevation device  80 , and thus, the elevation device  80  may be more effectively lifted. Thus, the elevation device  80  in the state in which the food is seated sufficiently while using only one of the drive motors  64  may be elevated, and a compact configuration may be realized. 
     The connecting assembly  70  may have an outer appearance defined by the connection case  71  and the connection cover  72 , and the lever fixing member  75  and the connection member  73  may be mounted on the connection case  71 . 
     The connecting assembly  70  may include the connection case  71 , the connection cover  72 , and the connection member  73 , the push member  74 , the lever fixing member  75 , and the elastic member  76 . 
     In detail, the connection case  71  may be opened on one side and includes a space for accommodating the lever fixing member  75 , the connection member  73 , the push member  74 , and a portion of the lever  42 . Also, a through-hole  712  may be defined in the space. An external fixing member  78  may be provided on the outer surface of the connection case  71  corresponding to the through-hole  712 . 
     Also, the lever fixing member  75  may be accommodated in the space inside the connection case  71  and define a surface capable of supporting one end of the elastic member  76 . Also, A first lever hole  424  of the lever  42  and the through-hole  712  may extend to be sequentially penetrated through a center of the lever fixing member  75  to allow the external fixing member  78  to be inserted therein. 
     The fixing shaft  77  may pass through the first connection part  731  of the connection member  73  and then be inserted into the lever fixing member  75 . Also, coupling members  771  and  772  may be coupled to both ends of the fixing shaft  77 , respectively. The lever fixing member  75 , the external fixing member  78 , and the connection member  73  may be coupled to the fixing shaft  77  through the coupling of the coupling members  771  and  772 . Thus, when the lever fixing member  75  rotates by the rotation of the lever  42 , the connection member  73  connected by the fixing shaft  77  may also rotate together. 
     The elastic member  76  may be provided between the connection member  73  and the lever fixing member  75 . The elastic member  76  may be compressed when the connection member  73  moves. In detail, the elastic member  76  may have a coil spring structure and have one end supported by the lever fixing member  75  and the other end supported by the connection support part  734  of the connection member  73 . 
     The connection member  73  may move in the front-rear direction within the space of the connection case  71 . Here, the connection member  73  may have a structure that is inserted into or protrudes to the space by the guide of the fixing shaft  77 . 
     In details of the structure of the connection member  73 , the connection member  73  may include a first connection part  731  which passes through the fixing shaft  77  and is concentric with the rotation axis of the lever  42 , a second connection part  731  which is spaced from the first connection part  731  and into which the lever protrusion  425  is inserted, and a connection part  733  connecting the first connection part  731  to the second connection part  732 . 
     The first connection part  731  may have a hollow cylindrical shape. Also, the rotation shaft  841   a  of the elevation device  80  may be inserted into the first connection part to rotate together with the rotation shaft  841   a  of the elevation device  80 . 
     Also, a connection support part  734  protruding outward by a predetermined width may be disposed on one side of the first connection portion  731 . The end of the elastic member  76  may contact the connection support part  734 , and the end of the first connection part  731  may contact the connection support part  734 . The connection support part  734  may protrude outward to support one end of the elastic member  76 , and one end of the first connection part  731  may be inserted into the elastic member  76  to prevent the elastic member  76  from being separated. 
     The connection support part  734  may be larger than the size of the through-hole  742  defined in the push member  74  to maintain the state in which the connection support part  734  is in close contact with the rear surface of the push member  74 . Thus, the connection support part  734  and the push member  74  may move together when the push member  74  is pressed or when the elastic member  76  returns to the initial position. 
     The second connection part  732  may be disposed at a position spaced apart from the first connection part  731  by the connection member  73 . The second connection part  732  may have a cylindrical shape that is penetrated in the front and rear direction. The lever protrusion  425  may be inserted into one side of the second connection part  732 , and the scissors protrusion  841   b  of the elevation device  80  may be inserted into the other side of the second connection part  732 . Thus, the second connection part  732  may rotate together with the scissors protrusion  841   b  and the lever protrusion  425  when the elevation device  80  operates. 
     The connection part  733  may be disposed so that the rotating shaft  841   a  and the scissors protrusion  841   b  of the elevation device  80  are respectively inserted into the first connection part  731  and the second connection part  732 . As the second connection part  732  move farther away from the first connection part  731 , the elevation device  80  may be easily elevated. However, when the first connection part  731  and the second connection part  732  are spaced a set distance or more from each other, the moving trajectory of the lever protrusion  425  and the scissors protrusion  841   b , which are inserted into the second connection part  732 , may extend up to a high height on the rear surface of the door part  31  and the front surface of the drawer part. Thus, the opened trajectory may be exposed to deteriorate the outer appearance. Thus, The position of the second connection part  732  may be determined by the length of the connection part  733 . Also, the second connection part  732  may be disposed at a height at which the rotation trajectory is not exposed, i.e., a position higher than the upper end of the elevation device  80 . 
     The push member  74  may be provided inside the connection device case  71  and may be exposed through the opening  721  of the connecting cover  72  so that the push member  68  is pressed by the user. The push member  74  may include a push part  741  that is exposed through the opening  721  of the connecting cover  72 . 
     A through-hole  742  through which the first connection part  731  passes may be defined in the push part  741 . The through-hole  742  may be larger than the outer diameter of the first connection part  731  and slightly smaller than the outer diameter of the connection support part  734 . Thus, when the push member  741  may be pushed to move the push member  74 , the first connection member  73  contacting the push member  74  may also move together to selectively connect the connection member  73  to the elevation device  80 . 
     The connecting cover  72  may be mounted on the opened front side of the connecting case  71 , and an opening  721  may be defined to expose the push part  741 . The connecting cover  72  may be firmly fixed to the connecting case  71  by the coupling member. Thus, the configuration of the connecting case  71  may be maintained in the mounted state. 
     The connecting case  71 , the push member  74 , and a portion of the connecting cover  72  may be opened by cutting the connection member  73  by a rotational trajectory. Thus, the connection member  73  may be prevented from interfering with the connecting case  71 , the push member  74 , and the connecting cover  72  when the connection member  73  rotates. 
     In this structure, the user may manipulate the push member  74  of the connecting assembly  70  to selectively couple and separate the connecting assembly  70  to and from the elevation device  80 . 
     Hereinafter, a structure of the drawer part  32  coupled to the door part  31  will now be described in more detail with reference to the accompanying drawings. 
       FIG.  20    is an exploded perspective view of the drawer part. 
     As illustrated in the drawings, the drawer part  32  may include a drawer body  38  defining an entire shape of the drawer part  32 , an elevation device  80  provided in the drawer body  38  to elevate the container and food, and a plurality of plates  391 ,  392 , and  393  defining an outer appearance of the drawer part  32 . 
     In more detail, the drawer body  38  may be injection-molded by using a plastic material and define an entire shape of the drawer part  32 . The drawer body  38  may have a basket shape having an opened top surface to define a food storage chamber therein. An inclined surface  321  may be disposed on a rear surface of the drawer body  38 . Thus, an interference with the machine room  3  may not occur. 
     The door frames  316  may be mounted on both sides of the drawer part  32 . The door frame  316  may be coupled to the lower frame of each of both sides of the bottom surface or both left and right surfaces of the drawer part  32 . In the state in which the door frame  316  and the drawer part  32  are coupled to each other, the drawer part  32  and the door part  31  may be integrally coupled to be inserted and withdrawn. 
     The door frame  316  may be separated from the drawer part  32 , and then the connecting assembly  70  may operate to separate the door part  31  from the drawer part  32  in order to separate the door part  31  from the drawer part  32 . The door frame  316  and the drawer part  32  may be coupled to each other by a separate coupling member or a coupling structure between the door frame  316  and the drawer unit  32 . 
     The draw-out rack  34  may be disposed on each of both the sides of the bottom surface of the drawer part  32 . The drawer part  32  may be inserted and withdrawn forward and backward by the draw-out rack  34 . In detail, in the state in which the drawer part  32  is mounted on the cabinet  10 , at least a portion is disposed in the storage chamber. Also, the draw-out rack  34  may be coupled to a pinion gear  141  disposed on the bottom surface of the storage chamber. Thus, when the draw-out motor  14  is driven, the pinion gear  141  may rotate to allow the draw-out rack  34  to move, and the drawer door  30  may be inserted and withdrawn. 
     The drawer door  30  may not be automatically inserted and withdrawn. That is, the user may push or pull the drawer door  30  to be inserted and withdrawn. Here, the draw-out rack  34  may be omitted, and thus, the insertion and withdrawal may be performed through only the draw-out rail  33 . 
     A rail mounting part  382  on which the draw-out rail  33  for guiding the insertion and withdrawal of the drawer body  38  is mounted may be disposed on a lower portion of each of both the side surfaces of the drawer body  38 . The rail mounting part  382  may extend from a front end to a rear end and provide a space in which the draw-out rail  33  is accommodated. The draw-out rail  33  may be a rail that extends in multistage. The draw-out rail  33  may have one end fixed to the storage space inside the cabinet  10  and the other end fixed to the rail mounting part  382  to more stably realize insertion and the withdrawal of the drawer door  30 . 
     Also, the plurality of plates  391 ,  392 , and  393  made of a plate-shaped metal material such as stainless steel to define at least portions of the inside and outside of the drawer body  38  may be provided on the drawer body  38 . 
     In detail, the outer side plate  391  may be disposed on each of both left and right surfaces of the outside of the drawer body  38 . The outer side plate  391  may be mounted on each of both the left and right surfaces of the drawer body  38  to define an outer appearance of each of both the side surfaces. Particularly, the constituents such as the door frame  316  and the draw-out rail  33 , which are mounted on both the sides of the drawer body  38  may not be exposed to the outside. 
     A plurality of reinforcement ribs  384  may cross each other in vertical and horizontal directions on both outer surfaces of the drawer body  38 . The reinforcement ribs  384  may reinforce the strength of the drawer body  38  itself so that the drawer body  38  is more rigidly shaped relative to the weight of the door, which increases by providing the driving device and the elevation. Also, the reinforcement ribs  384  may support the outer side plates  391  mounted on both side surfaces, and thus the outer appearance of the drawer part  32  may be firmly maintained. 
     An inner side plate  392  may be disposed on each of both left and right surfaces of the inside of the drawer body  38 . The inner side plate  392  may be mounted on each of both the side surfaces of the drawer body  38  to define both the left and right surfaces of the inside thereof. 
     The inner plate  395  may be constituted by a front surface part  395   a , a bottom surface part  395   b , and a rear surface part  395   c , which have sizes correspond to the front surface, the bottom surface, and the rear surface of the inside of the drawer body  38 . The inner plate  395  may be provided by bending the plate-shaped stainless material so that the inner plate  395  defines the inner surface of the remaining portion except for both the left and right surfaces of the drawer body  38 . Also, both left and right ends of the inner plate  395  may contact the inner side plate  392 . The front surface part  395   a , the bottom surface part  395   b , and the rear surface part  395   c  constituting the inner plate  395  may be separately provided and then coupled to or contact each other. 
     The entire inner surfaces of the drawer body  38  may be defined by the inner side plate  392  and the inner plate  395 , and the inner surface of the drawer body  38  may provide texture of the metal. Thus, the storage chamber within the drawer part  32  may have a metal texture on the whole, and the foods accommodated in the drawer part  32  may be more uniformly cooled and thus stored at a low temperature in the more uniform region. In addition, visually excellent cooling performance and storage performance may be provided to the user. 
     The drawer cover  37  may include a cover front part  371  that partitions the inside of the drawer body  38  into a front space S 1  and a rear space S 2  and a cover top surface part  372  bent from an upper end of the cover front surface part  371  to cover a top surface of the rear space S 2 . 
     That is, when the drawer cover  37  is mounted, only the front space S 1 , in which the elevation device  80  is disposed, may be exposed in the drawer body  38 , and the rear space S 2  may be covered by the drawer cover  37 . 
     The elevation  80  may be disposed in the drawer body  38 . The elevation device  80  may be connected to the connecting assembly  70  and may be vertically movable. The left and right sides of the elevation device  80  may be elevated uniformly. 
     A drawer opening  35  may be defined in the lower part of the front surface of the drawer part  32  for coupling the elevation device  80  to the connecting assembly  70 . The drawer opening  35  may provide a passage through which the connection member  73  is inserted to be coupled to the elevation device. Also, the drawer opening  35  may have an opening shape along the rotation path of the connection member  73  when the connection member  73  rotates to allow the connection member  73  to rotate, and thus, the stable rotation may be achieved without the interference. 
     The elevation device  80  may be provided as a scissors type so that the elevation device is folded in a descending state and unfolded in an ascending state. Thus, the container or food seated on the upper surface may be elevated. 
     The elevation device  80  may be provided with a support plate  81 , and the support plate  81  may provide a seating surface on which the container  36  or food is seated. 
       FIG.  21    is an exploded perspective view illustrating a coupling relationship between the drawer part and the connecting assembly. Also,  FIG.  22    is an enlarged view illustrating a portion B of  FIG.  21   . 
     As illustrated in the drawings, the drawer opening  35  may be defined in the right and left sides of the lower front of the drawer part  32 . The shape of the drawer opening  35  on each of both sides of the right and left sides may be symmetrical to each other, and the rotation shaft  841   a  of the elevation device  80  and the scissors protrusion  841   b  may be exposed through the drawer opening  35 . That is, the drawer opening  35  may be opened at a position corresponding to the rotation shaft  841   a  of the elevation device  80  and the scissors protrusion  841   b.    
     The drawer opening  35  may include a central portion  351  and a trajectory portion  352 . The center portion  351  may be disposed at a position corresponding to the rotation shaft  841   a  of the elevation device  80  and may have a size such that the first connection part  731  of the connection member  73  is inserted. Also, the trajectory portion  352  may be connected to the center portion  351  and may be opened in a shape corresponding to the trajectory in which the second connection part  732  of the connection member  73  move to rotate. Thus, the rotation shaft  841   a  of the elevation device  80  may rotate on the central portion  351  while the scissors protrusion  841   b  of the elevation device  80  rotates along the trajectory portion  352 . That is, the scissors protrusion  841   b  and the second connection part  732  may be disposed inside the center portion  351  and the trajectory portion  352  when the elevation device  80  moves vertically. 
     The height of the drawer opening  35  may be lower than the upper end of the elevation device  80 , i.e., the top surface of the support plate  81 . Thus, the drawer opening  35  may be prevented from being seen from the inside of the drawer part  32  in any state in the state in which the elevation device  80  is mounted. 
     The rotation shaft  841   a  and the scissors protrusion  841   b  of the elevation device  80  may be exposed through the drawer opening  35  while the elevation device  80  is mounted inside the drawer part  32 . Also, in the state in which the drawer door  30  is coupled, the connection member  73  of the connecting assembly  70  may be inserted through the inside of the drawer opening  35  so as to be coupled to the rotation shaft  841   a  of the elevation device  80  and the scissors protrusion  841   b.    
     The connecting assembly  70  may be provided on each of both right and left sides of the drawer part  32  and may have a shape symmetrical to each other. The selective separation of the elevation device  80  and the connecting assembly  70  may be enabled through the manipulation of the push member  74 . 
     The circumference of the support plate  81  may protrude upward so that the container  36  or food is stably mounted. Also, the circumference of the support plate  81  may extend downward. Thus, the remaining constituents of the elevation device  80  may be accommodated below the support plate  81 , and the covered and clean outer appearance may be realized by the circumference of the support plate  81 . 
     In addition, the support plate  81  may have a size and a shape corresponding to the front space to prevent foreign matters from being introduced into the elevation device  80  provided below the front space S 1 , and also, to fundamentally prevent safety accidents from occurring by blocking the access to the elevation device  80 . 
     Hereinafter, constituents of the elevation device  80  will be described in more detail. 
       FIG.  23    is a perspective view of an elevation device according to an embodiment. Also,  FIG.  24    is an exploded perspective view of the elevation device. Also,  FIG.  25    is an perspective view of the scissors assembly that is one component of the elevation device. 
     As illustrated in the drawings, the elevation device  80  may be provided on the bottom surface of the inner side of the drawer part  32  and may be detachably installed on the inside of the drawer part  32 . Also, the elevation device  80  may include an upper frame  82  and a lower frame  83  as a whole and a scissors lift assembly  84  disposed between the upper frame  82  and the lower frame  83 . 
     In detail, the upper frame  82  may have a square frame shape corresponding to the size of the inner front space S 1  of the drawer part  32  and may be configured to mount the support plate  81  on the top surface thereof. 
     The upper frame  82  of the elevation device  80  may move upward and downward and substantially supports the food or the container  36  together with the support plate  81 . Also, the upper frame  82  may generally defines a frame part  821  which defines a circumferential shape of the upper frame  82  and a partition part  822  for partitioning the space inside the frame portion  821  into left and right sides. 
     Since the frame part  821  and the partition part  822  define an outer frame and support the support plate  81 , high strength may be required, and thus, the frame part  821  and the partition part  822  may be made of a metal and may have shape in which both ends are bent to increase the strength and prevent deformation. 
     Also, a slide guide  825  may be disposed on each of both sides of the inner side of the frame part  821  to accommodate the end of the scissors lift assembly  84  and guide the movement of the scissors lift assembly  84 . The slide guides  825  may be disposed on both sides of the partition part  822 . Also, the scissors assemblies  84  may be disposed in the spaces  823  and  824  on both sides partitioned by the partition part  822 , respectively. 
     The slide guide  825  may be separately molded by using a plastic material having excellent abrasion resistance and lubrication performance and mounted on the upper frame  82 . Also, a long hole  825   a  through which the sliding shaft  842  of the scissors lift assembly passes may be defined in the slide guide  825 , and the sliding shaft  842  may move along the slide guide  825 . Also, a sliding surface  825   b  having a predetermined width may be further disposed along the circumference of the lone hole  825   a , and the sliding shaft  842  may be supported by the sliding surface  825   b  so that the scissors lift assembly  84  is more smoothly folded or unfolded. 
     The frame part  821  may include vertically curved edges  821   a  and  821   b  along the circumference thereof. The edges  821   a  and  821   b  may be disposed on the inner side and the outer side of the frame part  821 , respectively. Also, the slide guide  825  may be disposed on the edge  821   b  inside the frame part  821 . Also, edge grooves  821   c  and  821   d  may be defined in the outer edge  821   a  of the frame part  821 . 
     The edge grooves  821   c  and  821   d  may be defined in the edge  821   a  by the grooves into which the rotation shaft  841   a  of the elevation device  80  and the scissors protrusion  841   b  are accommodated while the elevation device  80  completely descends and may include a first edge groove  821   c  and a second edge groove  821   d  corresponding to the rotation shaft  841   a  and the scissors protrusion  841   b  at the end of the first edge groove  821   c . When the upper frame  82  completely descends to contact the lower frame  83 , the upper frame  82  may contact the edge grooves  821   c  and  821   d  defined in the lower frame  83  to provide a complete hole shape so that the rotation shaft  841   a  and the scissors protrude  841   b  pass therethrough. 
     The edge grooves  821   c  and  821   d  may be defined in a number corresponding to the rotation shaft  841   a  when the scissors protrusion  841   b  is not provided but only the rotation shaft  841   a  is provided. The edge grooves  821   c  and  821   d  and the rotation shaft  841   a  and the scissors protrusion  841   b  may be disposed adjacent to the left and right ends of the elevation device  80  and may be exposed through the drawer opening  35 . 
     The frame part  821  may define a space of which a bottom surface is opened by the edges  821   a  and  821   b  on both sides. Also, scissors fixing members (not shown, the same reference numeral  836 ) may be provided at both ends of the inner space of the frame part  821 . The scissors fixing member (not shown, the same reference numeral  836 ) may fix the rotation shaft  847  of the scissors lift assembly  84 , and a pair of scissors fixing members  826  may be provided at both ends. The scissors fixing member (not shown, the same reference numeral  836 ) may also be made of an engineering plastic material having abrasion resistance due to continuous friction with the rotating shaft  847 . Also, the scissors fixing member (not shown, the same reference numeral  836 ) may have a through-hole through which the rotation shaft  847  passes. 
     A plurality of scissors fixing members  826  may be provided on both ends of the frame part  821  to fix both ends of the rotation shaft  847 . The scissors fixing member  826  may stably fix the rotation shaft  847  to allow the scissors lift assembly  84  to be smoothly folded and unfolded. 
     The lower frame  83  may have the same structure as that of the upper frame  85  but only in the direction. The lower frame  83  may include a frame part  831  and a partition part  832  and define spaces  833  and  834  in which the scissors assemblies  84  are respectively installed. 
     Also, the slide guide  825  may be provided on the inner frame  821   b  of the frame part  821 , and the first frame groove  831   c  and the second frame groove  831   d  may be defined in the outer frame  821   a . Also, the scissors fixing member  826  may be provided in the inner space of the frame portion  821 . 
     The outer frame  821   a  of the upper frame  82  and the outer frame  821   a  of the lower frame  83  may contact each other when the upper frame  82  completely move downward. Thus, the frame part  821  of the upper frame  82  and the frame part  821  of the lower frame  83  may contact each other to define a closed space therein, and the scissors lift assembly  84  may be accommodated in the closed space in the completely folded state. That is, the constituents of the scissors lift assembly  84  may be disposed inside the frame part  821  of the lower frame  82  and the upper frame  82  in the state in which the elevation device  80  descends to the lowest state. 
     Thus, the additional space for accommodating the scissors lift assembly  84  in addition to the upper frame  82  and the lower frame  83  may not be required so that the loss of storage chamber inside the drawer unit  32  is minimized. 
     Furthermore, since the support plate  81  also has a structure capable of accommodating the upper frame  82  and/or the lower frame  83 , a space for arranging the upper frame  82  and the lower frame  83  may not be additionally required to minimize the space loss. 
     That is, even if the elevation device  80  having the complicated scissors type is disposed, a space loss equivalent to the thickness of the support plate  81  may be generated to very effectively utilize the interior of the drawer unit  32 . 
     An elevation device fixing part  837  may be disposed on the bottom surface of the frame part  821  of the lower frame  83 . The elevation device fixing part  837  may have an opened hole shape and have a protruding shape protruding from the bottom surface of the drawer part  32  when the elevation device  80  is mounted inside the drawer part  32  and may be combined in shape with an elevation device coupling part (not shown). That is, the elevation device  80  may be fixed to match the inside of the drawer part  32  by a simple operation that is seated inside the drawer part  32  and be maintained in the stable state even though the elevation device  80  operates. Also, the elevation device  80  may be easily lifted and separated from the drawer part  32  without any additional tool even if the elevation device  80  is not disposed in the drawer part  32 . 
     The scissors lift assemblies  84  may be provided on both left and right sides of the scissors lift assembly  84 . The scissors lift assemblies  84  may be connected to the connecting assembly  70  and may be independently driven by the power transmitted through the shaft  41  and the lever  42  to lift the upper frame  82 . Here, the scissors lift assemblies  84  on both sides may not cause any misalignment or deviation in one of the driving motors  64  and the structure of the driving device  40  including the shaft  41  and the screw assembly  50  so as to provide a structure capable of being elevated by the same height. 
     Thus, the scissors lift assembly  84  may be effectively elevated by the pair of the scissors lift assemblies  84  which independently apply the forces to both sides even when the heavy load is supported by the scissors lift assembly  84 . Here, the upper frame  82 , i.e., the support plate  81  may be elevated in a horizontal state through the scissors lift assembly  84 . 
     The scissors lift assembly  84  may include a pair of first rods  841  arranged in parallel to each other, a first sliding shaft  842  connecting both ends of the first rod  841 , and a first rotation shaft  847 . 
     Each of the first rod  841 , the first sliding shaft  842 , and the first rotation shaft  847  may have a width that is enough to be accommodated inside the frame part  821 . Also, the first rod  841  may be disposed at a position corresponding to the region of the frame part  821 , and the first rotation shaft  847  may also be disposed at an region corresponding to the frame part  821 . 
     Also, the rotation shaft  841   a  and the scissors protrusion  841   b  may be disposed on one end of the first rod  841 . Here, the rotation shaft  841   a  may be disposed on the same extension line as the first rotation shaft  847 , and the first rotation shaft  847  may rotate when the rotation shaft  841   a  rotates. 
     The first rotation shaft  843  may further include a rotation enhancing part  843   a . The rotation enhancing part  843   a  may be configured to connect a portion of the first rod  841  to the entire first rotation shaft  847 . Thus, when the first rod  841  rotates, the first rotation shaft  847  may rotate together and also be enhanced to withstand the generated moment. 
     Also, a mounting hole  342   b  may be defined in each of both ends of the rotation enhancing part  843   a , and the scissors fixing member  826  may be mounted to pass through the mounting hole  842   b . Thus, the first rotation shaft  847  may be rotatably mounted on the scissors fixing member  826  of the lower frame  83 . 
     Also, the first sliding shaft  842  may connect the other end of the first rod  841  and may be disposed to pass through the slide guide  825 . Thus, the first sliding shaft  842  may move along the slide guide  825  of the upper frame  82  when the first rod  841  rotates. 
     Also, a pair of second rods  844  may be provided to cross the first rod  841 . The first rod  841  and the second rod  844  may be connected to each other by the scissors shaft  845  so that the first rod  841  and the second rod  844  rotate in the state of crossing each other. A second sliding shaft  842  and a second rotating shaft  847  connecting both ends of the second rod  844  may be further provided. 
     The second rod  844 , the second sliding shaft  842 , and the second rotation shaft  847  may also have shapes and arrangements that are enough to be accommodated in the frame part  821 . In this state, both the second rotation shafts  847  connecting the upper ends of the second rods  844  may be provided. 
     The second rotation shaft  847  may be rotatably mounted on the scissors fixing member  826  of the upper frame  82 . Here, the second rotation shaft  847  passing through the scissors fixing member  826  may further include a rotation bush  847   a . The rotation bush  847   a  may contact the inner surface of the scissors fixing member  826  and may be made of a plastic material having excellent lubrication performance and abrasion resistance. Thus, the operation of the scissors lift assembly  84  may be smoothly performed. 
     The lower ends of the second rods  844  disposed on both sides may be connected by the second sliding shaft  842 . The second sliding shaft  846  may be mounted to pass through the slide guide  835  provided in the lower frame  83  and may move along the slide guide  835  as the elevation device  80  is elevated. 
     Hereinafter, the selective coupling and power connection of the elevation device  80  and the connecting assembly  70  will be described in more detail with reference to the drawings. 
       FIG.  26    is a perspective view illustrating a connection state between the connecting assembly and the elevation device. Also,  FIG.  27    is a perspective view illustrating a separation state of the connecting assembly and the elevation device. 
     As illustrated in the drawings, if the service of the driving device  40  or the elevation device  80  is necessary or if the use of the elevation device  80  is not desired, the driving device  40  and the elevation device  80  may be simply separated from and coupled to each other. 
     As illustrated in  FIG.  26   , the door part  31  and the drawer part  32  may be coupled to each other, and power transmission may be possible in the state in which the connecting assembly  70  and the elevation device  80  are connected to each other. Here, the connection member  73  may be connected to the lever  42  and the elevation device  80 , and the first connection part  731  may be connected to the fixing shaft  77  and the rotation shaft  841   a  of the elevation device  80 . The lever protrusion  425  and the scissors protrusion  841   b  may be inserted into the second connection part  732 . 
     In this state, when the lever  42  rotates by the operation of the driving device  40 , the rotation shaft  841   a  of the elevation device  80  may rotate by the first connection part  731 , and the scissors assembly  84  of the elevation device  80  may rotate. 
     Here, since the second connection part  732  is connected to the scissors protrusion  841   b  of the elevation device  80 , greater force may be transmitted to the elevation device  80 . In detail, the second connection part  732  may be disposed at a position away from the first connection part  731 , and thus when the first connection part  731  rotates around the shaft, a moment similar to a leverage may be applied to the second connection part  732 . Thus, a moment greater than the moment generated at the first connection part  731  may be applied together with the second connection part  732 , and thus the elevation device  80  may rotate with larger force. 
     Furthermore, since the pair of scissors lift assemblies  84  are disposed on both sides of the scissors lift assembly  84 , the power may be transmitted to the scissors lift assembly  84 , thereby effectively elevating the elevation device  80  with less force. 
     The connection member  73  may have a single shaft structure that connects the lever  42  to the rotation shaft  841   a  of the elevation device  80  when the torque by the driving device  40  is sufficient. The scissors lift assembly  84  may also be configured so that the connection member  73  is connected to each of both sides of one of the scissors lift assemblies  84  to elevate the elevation device  80 . 
     The user may push the push member  74  of the connecting assembly  70  to push the connection member  73  as illustrated in  FIG.  27    in the state in which the service condition of the driving device or the elevation device  80  of the refrigerator  1  occurs. The coupling between the connection member  73  and the elevation device  80  may be released by allowing the connection member  73  to move forward. 
     In this state, the door part  31  may be separated from the drawer part  32 , and the entire driving part  40  provided in the door part  31  may be completely separated from the drawer part  32  by a single operation. 
     The driving part  40  may be maintained in the state in which the door part  31  is separated, and the door part  31 , which normally operates as necessary, may be replaced to be mounted. Here, the connection member  73  of the door part  31  may be coupled to the rotation shaft  841   a  and the scissors protrusion  841   b  of the elevation device without separate assembly and disassembly. 
     The door part  31  and the drawer part  32  may be rigidly coupled to each other by the door frame or other structure, and the door part  31  and the drawer part  32  may be additionally separated from or coupled to each other when the door part  31  and the drawer part  32  are separated from or coupled to each other. 
     Hereinafter, a state in which the drawer door  30  of the refrigerator  1  is inserted and withdrawn and is elevated according to an embodiment will be described in more detail with reference to the accompanying drawings. 
       FIG.  28    is a perspective view illustrating a state in which the drawer door is closed. Also,  FIG.  29    is a perspective view illustrating a state of the wiring guider in a state in which the drawer door is closed. 
     As illustrated in the drawing, in the state in which the food is stored, the refrigerator  1  may be maintained in a state in which all of the rotation door  20  and the drawer door  30  are closed. In this state, the user may withdraw the drawer door  30  to accommodate the food. 
     When the drawer door  30  is completely closed, the wiring guider  90  may be maintained in the U shape as illustrated in  FIG.  29   . The guide head  92  may be disposed at a position adjacent to the front end of the cabinet  10  and also be disposed at the rearmost position. 
     In this state, the wiring  962  may be guided to the door part  31  through the wiring guider  90  and be maintained in the electrically connected state so that the electronic components within the door part  31  in addition to the driving device  40  are driven. 
     The drawer door  30  may be provided in plurality in a vertical direction and be withdrawn to be opened by the user&#39;s manipulation. Here, the user&#39;s manipulation may be performed by touching the manipulation part  301  disposed on the front surface of the rotation door  20  or the drawer door  30 . Alternatively, an opening command may be inputted on the manipulation device  302  provided on the lower end of the drawer door  30 . Also, the manipulation part  301  and the manipulation device  302  may individually manipulate the insertion and withdrawal of the drawer door  30  and the elevation of the elevation member  80 . Alternatively, the user may hold a handle of the drawer door  30  to open the drawer door  30 . 
     Hereinafter, although the lowermost drawer door  30  of the drawer doors  30 , which are disposed in the vertical direction, is opened and elevated as an example, all of the upper and lower drawer doors  30  may be inserted and withdrawn and elevated in the same manner. 
       FIG.  30    is a perspective view illustrating a state in which the drawer door is completely opened. Also,  FIG.  31    is a perspective view illustrating a state of the wiring guider in the state in which the drawer door is withdrawn. Also,  FIG.  32    is a cross-sectional view illustrating a state of the drawer door in a state in which the basket of the drawer door completely descends. 
     As illustrated in the drawings, the user may manipulate the draw-out operation on the drawer door  30  to withdraw the drawer door  30  forward. The drawer door  30  may be withdrawn while the draw-out rail  33  extends. 
     The drawer door  30  may be configured to be inserted and withdrawn by the driving of the draw-out motor  14 , not by a method of directly pulling the drawer door  30  by the user. The draw-out rack  34  provided on the bottom surface of the drawer door  30  may be coupled to the pinion gear  141  rotating when the draw-out motor  14  provided in the cabinet  10  is driven. Thus, the drawer door  30  may be inserted and withdrawn according to the driving of the draw-out motor  14 . 
     The draw-out distance of the drawer door  30  may correspond to a distance at which the front space S 1  within the drawer part  32  is completely exposed to the outside. Thus, in this state, when the elevation device  80  is elevated, the container or the food may not interfere with the doors  20  and  30  or the cabinet  10  disposed thereabove. 
     Here, the draw-out distance of the drawer door  30  may be determined by a draw-out detection device  15  disposed on the cabinet  10  and/or the drawer door  30 . The draw-out detection device  15  may be provided as a detection sensor that detects a magnet  389  to detect a state in which the drawer door  30  is completely withdrawn or closed. 
     For example, as illustrated in the drawings, the magnet  389  may be disposed on the bottom of the drawer part  32 , and the detection sensor may be disposed on the cabinet  10 . The draw-out detection device  15  may be disposed at a position corresponding to a position of the magnet  389  when the drawer door  30  is closed and a position of the magnet  389  when the drawer door  30  is completely withdrawn. Thus, the draw-out state of the drawer door  30  may be determined by the draw-out detection device  15 . 
     Also, as necessary, a switch may be provided at each of positions at which the drawer door  30  is completely inserted and withdrawn to detect the draw-out state of the drawer door  30 . In addition, the draw-out state of the drawer door  30  may be detected by counting the rotation number of draw-out motor  14  or measuring a distance between the rear surface of the door part  31  and the front end of the cabinet  10 . 
     When the drawer door  30  is withdrawn, the guide head  92  coupled to the rear surface of the door part  31  may also move forward together with the door part  31 . When the guide head  92  moves forward, the flexible portions  93  connected to the guide head  92  may also move forward together. 
     Thus, the plurality of flexible portions  93  may move in the state of being connected to each other. Also, some of the flexible portions  93  may rotate. Thus, the flexible portions  93  may freely rotate according to the movement of the drawer door  30 . 
     Also, when the drawer door  30  is completely withdrawn as illustrated in  FIG.  31   , much of the flexible portions  93  may move forward and thus may have a “T” shape or “J” shape as illustrated in  FIG.  31   . 
     In detail, when compared to the state in which the drawer door is inserted, a linear section S 1 ′ connected to the guide head  92  may increase in length on a whole. Also, a bent section S 3 ′ and the linear section S 2  connected to the rotation connection member  94  may be reduced or actually removed. Also, here, the rotation connection member  94  may rotate in the direction in which the flexible portions  93  move. 
     Here, the rotation connection member  94  may also rotate according to the states of the flexible portions  93  to prevent the flexible portions  93  from being deformed or damaged by excessive force. 
     In the state in which the drawer door  30  is completely withdrawn, the elevation motor  64  may be driven to elevate the elevation device  80 . The elevation device  80  may be driven in an even situation in which the drawer door  30  is sufficiently withdrawn to secure safe elevation of the food or container  36  seated on the elevation device  80 . 
     That is, in the state in which the drawer door  30  is withdrawn to completely expose the front space S 1  to the outside, the elevation device  80  may ascend to prevent the container  36  or the stored food seated on the elevation device  80  from interfering with the doors  20  and  30  or the cabinet  10 . 
     In details of the draw-out state of the drawer door  30 , the front space S 1  has to be completely withdrawn to the outside of the lower storage chamber  12  in the state in which the drawer door  30  is withdrawn for the elevation. 
     Particularly, the rear end L 1  of the front space S 1  has to be more withdrawn than the front end L 2  of the cabinet  10  or the upper door  20 . Also, the rear end L 1  of the front space S 1  is disposed at a further front side than the front end L 2  of the cabinet  10  or the door  20  so at to prevent the elevation device  80  from interfering when the elevation device  80  is elevated. 
     Also, when the elevation device  80  is completely withdrawn to be driven, the entire drawer part  32  may not be completely withdrawn but withdrawn up to only a position for avoiding interference when the elevation device  80  is elevated as illustrated in  FIG.  32   . Here, at least a portion of the rear space S 2  of the drawer part  32  may be disposed inside the lower storage chamber  12 . That is, the rear end L 3  of the drawer part  32  may be disposed at least inside the lower storage chamber  12 . 
     Thus, even when the weight of the stored object is added to the weight of the drawer door  30  itself including the driving device  40  and the elevation device  80 , the deflection or damage of the draw-out rail  33  or the drawer door  30  itself may not occur to secure the reliable draw-out operation. 
     The ascending of the elevation device  80  may start in a state in which the drawer door  30  is completely withdrawn. Also, to secure the user&#39;s safety and prevent the food from being damaged, the ascending of the elevation device  80  may start after a set time elapses after the drawer door  30  is completely withdrawn. 
     After the drawer door  30  is completely withdrawn, the user may manipulate the manipulation part  301  to input the ascending of the elevation device  80 . That is, the manipulation part  301  may be manipulated to withdraw the drawer door  30 , and the manipulation part  301  may be manipulated again to elevate the elevation device  80 . 
     Also, in the state in which the drawer door  30  is manually inserted and withdrawn, the manipulation part  301  may be manipulated to elevate the elevation device  80 . 
     As illustrated in  FIG.  32   , the driving device  40  and the elevation device  80  may not operate until the drawer door  30  is completely withdrawn, and the elevation device  80  may be maintained in the lowest state. 
       FIG.  33    is a cross-sectional view illustrating a state of the drawer door in a state in which the basket of the drawer door completely ascends. 
     As illustrated in  FIG.  32   , in the state in which the drawer door  30  is withdrawn, when the operation signal of the driving device is inputted, the driving device  40  may operate, and the state as illustrated in  FIG.  33    may be obtained by elevating the elevation device  80 . 
     The driving device  40  may be connected to the elevation device  80  by the connecting assembly  70  so that the power is transmitted to the elevation device  80 . The power may be transmitted to the elevation device  80  by the connecting assembly  70  together with the operation of the driving device  40 , and the elevation device  80  may start to ascend. 
     The elevation device  80  may continuously ascend and then be stopped when ascend to a sufficient height to facilitate access to the food or container  36  seated on the elevation device  80  as illustrated in  FIG.  34   . In this state, the user may easily lift the food or container  36  without overtaxing the waist. 
     When the elevation completion signal of the elevation device  80  is inputted, the driving of the driving motor  64  may be stopped. For this, an elevation detection device  16  capable of detecting the position of the elevation device  80  may be provided. The elevation detection device  16  may be provided on the door part  31  and may be disposed at a position corresponding to the maximum height of the elevation device  80  and at a position corresponding to the lowest height of the elevation device  80 . 
     The elevation detection device  16  may be provided as a detection sensor that detects a magnet  388 . The elevation detection device  16  may detect the magnet  388  disposed on the elevation device  80  to determine whether the ascending of the elevation device  80  is completed. Also, the elevation detection device  16  may be provided as a switch structure to turn on the switch when the elevation device  80  maximally ascends. Also, the elevation detection device  16  may be provided on the elevation rail  44  or the screw  52  to detect the maximally ascending position of the elevation member  80 . Also, whether the elevation device  80  maximally ascends may be determined according to a variation in load applied to the elevation motor  64 . 
     The driving of the elevation motor  64  is stopped in the state in which the elevation device  80  maximally ascends. In this state, although the elevation device  80  is disposed inside the drawer part  32 , the food or container  36  seated on the elevation device  80  may be disposed at a position higher than the opened top surface of the drawer part  32 . Thus, the user may easily access the food or container  36 . Particularly, it is not necessary to allow the waist excessively for lifting the container  36 , so that it is possible to perform safer and more convenient operation. 
     In details of the maximally ascending state of the elevation device  80 , the elevation device  80  may be elevated by driving the driving device  40  and be disposed at least at a lower position than the upper end of the drawer part  32 . 
     In the driving device  80 , when viewed with respect to the container  36  in the state in which the container  36  is seated, the upper end H 1  of the container  36  may ascend to a position higher than the upper end H 2  of the lower storage chamber  12 . Here, the height of the container  36  may reach a height suitable for the user to reach the container  36  without stretching his/her waist. 
     That is, the driving device  40  may have a structure in which the container  36  ascends from the inside of the drawer part  32 . However, when the container  36  is mounted on the elevation device  80 , the container  36  may be disposed at an accessible height. 
     After the user&#39;s food storing operation is completed, the user may allow the elevation device  80  to descend by manipulating the manipulation part  301 . The descending of the elevation device  80  may be performed by reverse rotation of the elevation motor  64  and may be gradually performed through the reverse procedure with respect to the above-described procedure. 
     Also, when the descending of the elevation device  80  is completed, i.e., in the state of  FIG.  31   , the completion of the descending of the elevation device  80  may be performed by the elevation detection device  16 . The elevation detection device  16  may be further provided at a position that detects the magnet  388  disposed on the elevation device  80  when the elevation device  80  is disposed at the lowermost descending position. Thus, when the completion of the descending of the elevation device  80  is detected, the driving of the driving motor  40  is stopped. 
     Also, after the driving of the driving motor  64  is stopped, the drawer door  30  may be inserted. Here, the drawer door  30  may be closed by the user&#39;s manipulation or by the driving of the draw-out motor  14 . When the drawer door  30  is completely closed, a state of  FIG.  29    may become. 
     In addition to the foregoing embodiment, various embodiments may be exemplified. 
     Hereinafter, another embodiments will be described with reference to the accompanying drawings. In the other embodiments of the present disclosure, the same reference numerals are used for the same components as those of the above-described embodiments, and a detailed description thereof will be omitted. 
       FIG.  34    is a perspective view of a refrigerator according to another embodiment. 
     As illustrated in the drawing, a refrigerator  1  according to another embodiment may include a cabinet  10  having a storage chamber that is vertically partitioned and a door  2  opening and closing the storage chamber. 
     The door  2  may include a rotation door  20  which is provided in an upper portion of a front surface of the cabinet  10  to open and close an upper storage chamber and a drawer door  30  disposed in a lower portion of the front surface of the cabinet  10  to open and close a lower storage chamber. The drawer door  30  may be inserted and withdrawn forward and backward in the above embodiment. In the state in which the drawer door  30  is withdrawn, the container and the food inside the drawer part  32  may be vertically elevated by the operation of the driving device  40  and the elevation device  80  inside the drawer door  30 . 
     The elevation device  80  may be provided in the region of the front space of the inside of the drawer part  32 . Thus, the elevation device  80  may elevate the food in the region of the front space among the entire region of the drawer part  32 . 
     A manipulation part  301  or a manipulation device  302  may be provided at one side of the door part  31 , and the driving part  40  may be installed inside the door part  31 . Also, the pulling-out operation of the drawer door  30  and/or the elevation of the elevation device  80  may be carried out by the manipulation of the manipulation part  301  or the manipulation device  302 . 
     The drawer part  32  may be provided with the elevation device  80 . The elevation device  80  may be elevated by a connecting assembly that connects the driving device to the elevation device. Since the constituent of the drawer door  30  and constituent of the driving device  40  and the elevation device  80  are the same as those according to the foregoing embodiment, their detailed descriptions will be omitted. 
     A plurality of containers  361  may be provided in the elevation device  80 . The container  361  may be a sealed container such as a kimchi passage, and a plurality of the containers  361  may be seated on the elevation device  80 . The container  361  may be elevated together with the elevation device  80  is elevated. Thus, in the state in which the container  361  ascends, at least a portion of the drawer part  32  may protrude, and thus, the user may easily lift the container  361 . 
     The elevation device  80  may interfere with the rotation door  20  in the rotation door  20  is opened even though the drawer door  30  is withdrawn. Thus, the elevation device  80  may ascend in a state in which the rotation door  20  is closed. For this, a door switch for detecting the opening/closing of the rotation door  20  may be further provided. 
     Also, although not shown, the wiring guider  90  connecting the door part  31  to the cabinet  10  may be disposed below the drawer door  30 . The wiring guider  90  may have the same configuration and arrangement as the forgoing embodiment. 
       FIG.  35    is a perspective view of a refrigerator according to another embodiment. 
     As illustrated in the drawings, a refrigerator  1  according to another embodiment includes a cabinet  10  defining a storage chamber therein and a door  2  opening and closing an opened front surface of the cabinet  10 , which define an outer appearance of the refrigerator  1 . 
     The door  2  may include a drawer door  30  that defines an entire outer appearance of the refrigerator  1  in a state in which the door  2  is closed and is withdrawn forward and backward. A plurality of the drawer doors  30  may be continuously arranged in the vertical direction. Also, the drawer doors  30  may be independently withdrawn by the user&#39;s manipulation. The drawer door  30  may be provided with the driving device  40  and the elevation device  80 . 
     The driving part  40  may be installed in the door part  31 , and the elevation part  80  may be provided inside the drawer part  32 . Also, the driving device  40  and the elevation device  80  may be connected to each other by the connecting assembly  70  when the door part  31  and the drawer part  32  are coupled to each other. Also, the elevation device  80  may be disposed in the front space S 1  of the total storage chamber of the drawer part  32 . 
     The insertion and withdrawal of the drawer door  30  and the elevation of the elevation device  80  may be individually performed. After the drawer door  30  is withdrawn, the elevation device  80  may ascend. Then, after the elevation device  80  descends, the insertion of the drawer door  30  may be continuously performed. 
     Also, when the plurality of drawer doors  30  are vertically arranged, the elevation device  80  inside the drawer door  30 , which is relatively downwardly disposed, may be prevented from ascending in a state where the drawer door  30  is relatively drawn upward. Thus, the drawer door  30  may be prevented from interfering with the drawer door  30  in which the food and container are withdrawn upward. 
     Also, although the elevation device  80  ascends in the state in which the drawer door  30  that is disposed at the uppermost side is withdrawn in  FIG.  35   , all of the drawer doors  30  disposed at the upper side may also be elevated by the elevation device  80  that is provided inside. 
     If a height of each of the drawer doors  30  disposed at the upper side is sufficiently high, only the drawer door  30  disposed at the lowermost position or the elevation device  80  of the of drawer doors  30  disposed relatively downward may be elevated. 
     Also, although not shown, the wiring guider  90  connecting the door part  31  to the cabinet  10  may be disposed below the drawer door  30 . The wiring guider  90  may have the same configuration and arrangement as the forgoing embodiment. 
       FIG.  36    is a perspective view of a refrigerator according to another embodiment. 
     As illustrated in the drawings, a refrigerator  1  according to another embodiment includes a cabinet  10  defining a storage chamber therein and a door  2  opening and closing an opened front surface of the cabinet  10 , which define an outer appearance of the refrigerator  1 . 
     The inside of the cabinet  10  may be divided into an upper space and a lower space. If necessary, the upper and lower storage chambers may be divided again into left and right spaces. 
     The door  2  may include a rotation door  20  which is provided in an upper portion of the cabinet  10  to open and close the upper storage chamber and a drawer door  2  disposed in a lower portion of the cabinet  10  to open and close the lower storage chamber. 
     Also, the lower space of the cabinet may be divided into left and right spaces. The drawer door  30  may be provided in a pair so that the pair of drawer doors  30  respectively open and close the lower spaces. A pair of the drawer doors  30  may be arranged on both sides of the right and left sides of the drawer door  30 . The drawer door  30  may include the driving device  40  and an elevation device  80 . 
     The driving part  40  may be installed in the door part  31 , and the elevation part  80  may be provided inside the drawer part  32 . Also, the driving device  40  and the elevation device  80  may be connected to each other by the connecting assembly  70  when the door part  31  and the drawer part  32  are coupled to each other. Also, the elevation device  80  may be disposed in the front space S 1  of the total storage chamber of the drawer part  32 . 
     The drawer door  30  may have the same structure as the drawer door according to the foregoing embodiment. Thus, the drawer door  30  may be inserted and withdrawn by user&#39;s manipulation. In the drawer door  30  is withdrawn, the elevation device  80  may ascend so that a user more easily accesses a food or container within the drawer door  30 . 
     Also, although not shown, the wiring guider  90  connecting the door part  31  to the cabinet  10  may be disposed below the drawer door  30 . The wiring guider  90  may have the same configuration and arrangement as the forgoing embodiment. 
     The following effects may be expected in the refrigerator according to the proposed embodiments of the present invention. 
     The refrigerator according to the embodiment, the portion of the storage chamber within the drawer door may be elevated in the state in which the drawer door is withdrawn. Thus, when the food is accommodated in the drawer door disposed at the lower side, the user may not excessively turn its back to improve the convenience in use. 
     Particularly, in order to lift the heavy-weight food or the container containing the food, the user has to lift the food or container with a lot of power. However, the elevation within the drawer door may ascend up to a convenient position by driving the driving device to prevent the user from being injured and significantly improve the convenience in use. 
     Also, the driving device constituted by the electric devices for providing the power may be provided inside the door part, and the elevation device for the elevation may be provided inside the drawer part so that the driving device and the elevation device are not exposed to the outside to improve the outer appearance. 
     Particularly, the driving device constituted by the electric devices may be disposed inside the door part, and it may be possible to prevent the user from accessing the door to prevent the occurrence of the safety accident. 
     Also, the driving device may be provided in the door to block the noise and reduce noise during the use. 
     Also, the driving part that occupies a large portion of the entire constituents may be disposed in the door part to minimize the storage capacity loss of the drawer part. Also, the elevation device or the structure that is compactly folded and accommodated in the descending state may be provided to secure the storage capacity in the refrigerator. 
     Also, the wiring guider that connects the door part including all of the electric components as well as the driving device to the cabinet to guide the wiring may be provided to prevent the wiring from being exposed and also being damaged even in the repeated draw-out operation of the drawer door. 
     Also, in the wiring guider, the rotation connection member to which the plurality of connecting members are rotatably connected and which is coupled to the side of the cabinet may also be rotatably provided to prevent the wiring from interfering with the wiring guider when the drawer door is inserted and withdrawn. Therefore, the drawer door may be stably inserted and withdrawn, and the wiring may be safely protected. 
     Also, the wiring guider may be disposed below the drawer part to provide the structure in which the wiring guider is coupled to the rear surface of the door part, thereby preventing the drawer door from being exposed while the drawer door is inserted and withdrawn. Therefore, the refrigerator may have the neat appearance, and also, the safety in use may be secured. 
     Also, the guide-side connector may be disposed on the front end of the wiring guider, and the door-side connector may be disposed on the rear surface of the door part. As a result, when the wiring guider is mounted on the door part, the guide-side connector and the door-side connector may be connected to each other to more facilitate the assembly and connection operations. In addition, the service of the electric components of the door part may be easy. 
     Also, the wiring guider may include the rotation connection member that is rotatably coupled to the cabinet. Thus, the wiring guider may be smoothly movable as the drawer part is inserted and withdrawn to prevent the wiring from being short-circuited and damaged. 
     Also, the rotation connection member may include the connection member stepped part and the connecting portion fixing part and be inserted into the wiring inlet hole defined in the bottom surface of the storage space to facilitate the assembly. In addition, even though the large force is applied to the wiring guider, the firm coupling state may be maintained. 
     Also, the connecting portion fixing part coupled to the connecting portion coupling part disposed on the bottom surface of the drawer part may be disposed on the plurality of connecting portions constituting the wiring guider. Thus, the long wiring guider may be prevented from drooping to reliably insert and withdraw the drawer door and prevent the wiring from being damaged. 
     Also, the cover plate constituting the wiring guider may cover the draw-out driving device configured to insert and withdraw the drawer door. Thus, the draw-out driving device and the wiring guider, which require the electrical connection, may be provided in the same space to facilitate the assembly and the service. 
     In addition, the draw-out driving device may be disposed in the recessed space of the bottom surface of the cabinet to minimize the loss of the storage space. 
     Also, the mounting structure of the draw-out motor, the pinion, the rack restriction device, and the detection device may be provided through the cover plate and thus be modularized to more improve the assembly operation. 
     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.