Patent Publication Number: US-9417004-B2

Title: Refrigerator and method for opening/closing door thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Korean Application No. 10-2012-0040523, filed Apr. 18, 2012, the subject matter of which is incorporated herein by reference. 
     FIELD 
     The present disclosure relates to a refrigerator and a method for opening/closing a door thereof. 
     BACKGROUND 
     In general, a refrigerator is an apparatus which cools a storage room, such as a cold room or freezer, using a refrigeration cycle circuit having a compressor, a condenser, an expansion device and evaporator, a thermo-module, etc., and keeps storage products, such as foods, in the storage room. 
     A door for opening/closing the storage room is mounted to the refrigerator, and a storage, such as a shelf or basket, in which storage products are kept, can be disposed inside the storage room or at the door. 
     Recently, a refrigerator has been developed, in which a home bar door is mounted in a door for opening/closing a storage room, and a home bar storage enabling storage products to be kept therein is mounted at a rear position of the home bar door in the door, so that storage products can be inserted/extracted into/from the home bar storage by opening the home bar door without opening the door. 
     SUMMARY 
     In one aspect, a refrigerator includes a main body, a storage room defined in the main body, and a cooling device configured to cool the storage room. The refrigerator also includes a door rotatably connected to the main body and configured to open and close the storage room. The refrigerator further includes a door storage unit mounted to the door and having a side storage portion that is accessible when the door is open to an acute opening angle. In addition, the refrigerator includes a door locking mechanism configured to selectively lock the door at the acute opening angle at which the side storage portion is exposed between the main body and the door. 
     Implementations may include one or more of the following features. For example, the side storage portion may be an opening in the door storage unit that extends in a lateral direction of the door. The side storage portion may be located at a side of the door storage unit. The side storage portion may be located at a side of the door storage unit, which is furthest from a rotational center of the door. 
     In addition, the side storage portion may have an inner wall and, when the door is closed, a gap may enable air from the storage room to enter the side storage portion past the inner wall. The side storage portion may have an opening at a first side and may be blocked at a second side opposite to the first side. The door storage unit may extend in the vertical direction. 
     Further, the door storage unit may include multiple side storage portions. The acute opening angle may be within a range from 10 to 30 degrees. The acute opening angle may be an opening angle at which the side storage portion is entirely exposed. The acute opening angle may correspond to a lateral width of the side storage portion. 
     In some implementations, the refrigerator may include a door manipulation portion configured to manipulate a locking mode of the door locking mechanism. In these implementations, the door locking mechanism may include a moving locking member mounted in the door and configured to move upward and downward, a door latch mounted in the door, configured to latch the moving locking member based on the moving locking member being moved downward to a descended position, and configured to release the moving locking member based on the moving locking member being moved upward to an ascended position, and a locking member holder having a holding groove portion. Also, in these implementations, the locking moving member may be configured to insert into the holding groove portion and be held to the door latch based on the door being rotated to the acute opening angle. Further, in these implementations, the refrigerator may include a connecting member that is linked with the door manipulation portion, that is connected to the door latch, and that is configured to release the door latch from the moving locking member. 
     In some examples, the refrigerator may include a maintaining mechanism configured to maintain a closed state of the door and release the closed state of the door and a manipulation member that is linked with the door manipulation portion and configured to release the closed state of the door maintained by the maintaining mechanism based on the door manipulation portion being manipulated. In these examples, the refrigerator may include an auxiliary manipulation portion mounted in the door and an auxiliary manipulation member that is linked with the auxiliary manipulation portion and that is configured to release the closed state of the door maintained by the maintaining mechanism based on the auxiliary manipulation portion being manipulated. 
     In another aspect, a refrigerator includes a main body, a storage room defined in the main body, and a cooling device configured to cool the storage room. The refrigerator also includes a door rotatably connected to the main body and configured to open and close the storage room. The refrigerator further includes a door storage unit mounted to the door and having a side storage portion that is accessible when the door is open to an acute opening angle. In addition, the refrigerator includes a maintaining mechanism configured to maintain a closed state of the door and release the closed state of the door and a manipulation mechanism configured to manipulate the maintaining mechanism. The manipulation mechanism is configured to selectively lock the door based on the door being rotated to the acute opening angle at which the side storage portion is exposed between the main body and the door. 
     In yet another aspect, a method for opening a door of a refrigerator includes enabling opening of a door of a refrigerator to an acute opening angle at which a side storage portion of a door storage unit mounted to the door is exposed between a main body of the refrigerator and the door. The method also includes locking the door at the acute opening angle to maintain an opening state of the side storage portion. The method further includes releasing the locking of the door after the opening state of the side storage portion has been maintained and enabling rotation of the door to an opening angle greater than the acute opening angle after the releasing of the locking of the door. 
     Implementations may include one or more of the following features. For example, the method may include enabling opening of the door of the refrigerator to the acute opening angle based on a user manipulating a door manipulation portion. The method may include releasing the locking of the door when the door is closed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an example refrigerator when a door is closed; 
         FIG. 2  is a perspective view of the example refrigerator when the door is opened with an acute opening angle at which a side storage product entrance/exit portion is exposed; 
         FIG. 3  is a perspective view of the example refrigerator when the door is opened with an opening angle greater than the acute opening angle; 
         FIG. 4  is a rear view illustrating the door of the example refrigerator; 
         FIG. 5  is a perspective view illustrating an example door locking mechanism when the door is closed in the example refrigerator; 
         FIG. 6  is a perspective view illustrating the example door locking mechanism when the door is maintained at an acute opening angle in the example refrigerator; and 
         FIG. 7  is a flowchart illustrating an example process for opening/closing the door of the example refrigerator. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  illustrates an example refrigerator when a door is closed.  FIG. 2  illustrates the example refrigerator when the door is opened with an acute opening angle at which a side storage product entrance/exit portion is exposed.  FIG. 3  illustrates the example refrigerator when the door is opened with an opening angle greater than the acute opening angle.  FIG. 4  illustrates the door in the example refrigerator.  FIG. 5  illustrates an example door locking mechanism when the door is closed in the example refrigerator.  FIG. 6  illustrates the example door locking mechanism when the door is maintained at an acute opening angle in the example refrigerator. 
     The refrigerator shown in  FIGS. 1-3  includes a main body  4  having a storage room  2  formed therein, a cooling device  6  cooling the storage room  2 , a door  20  rotatably connected to the main body  4  so as to open/close the storage room  2 , and a door storage  30  mounted to the door  20 . 
     The storage room  2  can have an opened front surface  3 . The storage room  2  may have an approximately hexahedral space. The main body  4  can have a machine room that is partitioned from the storage room  2 . A storage  8  in which storage products can be kept separately from the door storage  30  can be disposed in the storage room  2 . The storage  8  of the storage room  2  can include one or more shelves  11 ,  12  and  13  arranged in the storage room  8 . The one or more shelves  11 ,  12  and  13  can partition the inside of the storage room  3  into a plurality of storage spaces. The one or more shelves  11 ,  12  and  13  can be arranged to be vertically spaced apart from one another. The one or more shelves  11 ,  12  and  13  can be mounted so that their positions are fixed inside the storage room  2 , or can be mounted so that their heights are adjustable. The storage  8  of the storage room  2  can include at least one drawer  14  slidingly attached/detached to/from the storage room  2 . 
     The cooling device  6  can include a refrigeration cycle circuit or thermo-module. The cooling device  6  can include a compressor compressing a refrigerant, a condenser condensing the refrigerant compressed in the compressor, an expansion mechanism expanding the refrigerant condensed in the condenser, and an evaporator evaporating the refrigerant expanded by the expansion mechanism. The compressor and the condenser can be mounted in the machine room formed in the main body  4 . The evaporator can be mounted in the storage room  2 , or can be mounted in a cooling room that communicates with the storage room  2 . The cooling device  6  can include an evaporator fan allowing air in the storage room  2  to be circulated to the storage room  2  and the evaporator. The air sent to the evaporator by the evaporator fan can be heat-exchanged with the refrigerant and then sent to the storage room  2 . The evaporator can be mounted to the outer wall of an inner casing of the storage room  2  so as to receive heat of the storage room  2  provided through the inner casing and to heat-exchange the received heat with the refrigerant. The cooling device  6  can include a condenser fan allowing air from the outside of the refrigerator to be sent to the condenser. The air sent to the condenser by the condenser fan can be heat-exchanged with the refrigerant and then exhausted to the outside of the refrigerator. 
     The door  20  can be mounted to be rotated about one of the left and right sides of the main body  4 . The door  20  can be connected so that one of the left and right sides of the door  20  is rotatable by hinge members  22  and  23 . The lower hinge member  22  can be connected to a lower portion of the door  20 , and the upper hinge member  23  can be connected to an upper portion of the door  20 . The door  20  can be adhered closely to a front surface of the main body  4  when the storage room  2  is closed. The door  20  can have a maximum opening angle (i.e., a maximum rotational angle at which the door  20  can be rotated about the front surface  3  of the storage room  2 ) of 90 degrees or more. The maximum opening angle of the door  20  can be an obtuse opening angle of 90 to 180 degrees, or can be an opening angle which exceeds 180 degrees. When the door  20  is rotated to an acute opening angle, a side storage product entrance/exit portion  32  can be exposed to the outside between the door  20  and the main body  4 . The door  20  can be rotated up to the position where the side storage product entrance/exit portion  32  is exposed between the door  20  and the main body  4  and then fixed. The refrigerator can include a door manipulation mechanism enabling a user to manipulate the position of the door  20 . When the user manipulates the door  20 , the door manipulation mechanism enables the door  20  to be fixed at the position where the side storage product entrance/exit portion  32  exposed through the door  20  and main body  4 . When the door manipulation mechanism is not manipulated, the door  20  is not fixed at the position where just the side storage product entrance/exit portion  32  is exposed through the door  20  and main body  4 , but can be rotated up to the maximum opening angle. The door manipulation mechanism enables the door  20  to be rotated to the acute opening angle at which storage products can be entered/exited between the main body  4  and the door  20 . The door manipulation mechanism can lock the door  20  at the acute opening angle of the door  20 , at which the side storage product entrance/exit portion  32  of the door storage  30  is exposed between the main body  4  and the door  20 . Here, the acute opening angle may be set to an opening angle at which the storage products can be accessed through the side storage product entrance/exit portion  32  of the door storage  30 . Leakage of cooling air through the gap between the door  20  and the main body  4  may be reduced by the door  20  being open only to the acute opening angle. The acute opening angle may be an opening angle at which the side storage product entrance/exit portion  32  of the door storage  30  can be entirely exposed when the door  20  is opened. The acute opening angle can be set to increase as the lateral width of the side storage product entrance/exit portion  32  increases. The acute opening angle can be set to decrease as the lateral width of the side storage product entrance/exit portion  32  decreases. The acute opening angle of the door  20 , which may be locked by the door manipulation mechanism, can be set in proportion to the lateral width of the side storage product entrance/exit portion  32 . The acute opening angle of the door  20 , which may be locked by the door manipulation mechanism, can be set to one of 10 to 30 degrees. 
     The refrigerator can include a door locking mechanism  50 . The door locking mechanism  50  can be a partial component of the door manipulation mechanism. The door locking mechanism  50  can lock the door  20  or release the locking of the door when the door  20  is rotated to the acute opening angle at which the side storage product entrance/exit portion  32  is exposed between the door  20  and the main body  4 . The door  20  can be locked by the door locking mechanism  50  at the acute opening angle where the side storage product entrance/exit portion  32  is exposed between the door  20  and the main body  4  so that the position of the door is fixed. When the door  20  is not locked by the door locking mechanism  50  at the acute opening angle where the side storage product entrance/exit portion  32  is exposed between the door  20  and the main body  4 , the door  20  may be rotated up to the maximum opening angle. That is, when the door  20  is positioned at the acute opening angle where the side storage product entrance/exit portion  32  is exposed between the door  20  and the main body  4 , the door locking mechanism  50  can selectively lock the door  20  or release the locking of the door  20 . The door  20  can be rotated in a first rotation region from the position at which the storage room  2  is closed to the position at which the door locking mechanism  50  can lock the door  20 . The door  20  can be rotated in a second rotation region from the position at which the door locking mechanism  50  can lock the door  20  to the position at which the door  20  is maximally opened. If the user rotates the door  20  in one direction while holding the door  20 , the door  20  can be opened while being rotated to the second rotation region by passing through the first rotation region. If the user rotates the door  20  in the opposite direction while holding the door  20 , the door  20  can be closed after passing through the first rotation region from the second rotation region. The door  20  can be rotated up to the position at which the door  20  can be locked by the door locking mechanism  50  from the position at which the storage room  2  is closed. The door  20  can be rotated to the maximum opening angle from the position at which the storage room  2  is closed. 
     The refrigerator can include a door manipulation portion  60  manipulating a locking mode of the door locking mechanism  50 . The door manipulation portion  60  can be mounted in the door  20 . The door manipulation portion  60  can be mounted to be pressed, pulled or rotated. If the user manipulates the door manipulation portion  60 , the door locking mechanism  50  can be interlocked with the door manipulation portion  60  so as to be changed into the locking mode in which the door  20  is locked. If the user manipulates the door manipulation portion  60 , the door  20  can be rotated in the direction where the storage room  2  is opened. The door  20  can be locked by the locking mode of the door locking mechanism  50  at the acute opening angle where the side storage product entrance/exit portion  32  is exposed between the main body  4  and the door  20 . 
     In addition to the door storage  30 , a sub-storage  24  can be mounted to the door  20 . The sub-storage  24  can be a storage having a storage product entrance/exit direction different from that of the door storage  30 . The sub-storage  24  and the door storage  30  can be mounted to the rear surface of the door  20 . The sub-storage  24  and the door storage  30  can be mounted to the door  20  so that their heights or positions are adjustable. The sub-storage  24  and the door storage  30  can be slid along a sliding guide arranged along the lateral direction on the rear surface of the door  20 . 
     The sub-storage  24  is not exposed when the door  20  is rotated to the acute opening angle by the door manipulation mechanism. The sub-storage  24  can be disposed along the lateral direction on the rear surface of the door  20 . The sub-storage  24  can be a vertical entrance/exit type storage through which storage products can enter/exit in the vertical direction. The sub-storage  24  has a side storage product entrance/exit portion at an upper surface thereof. The sub-storage  24  can be arranged in plural numbers to be spaced apart from one another on the rear surface of the door  20 . The sub-storage  24  can be mounted closer to the rotational center of the door  20  than the door storage  30 . The sub-storage  24  can be covered by the door storage  30  when the door  20  is rotated at the acute opening angle by the door manipulation mechanism, and cannot be exposed through the gap between a side end of the door  20  and the main body  4 . In a case where the door storage  30  is moved in the lateral direction, the sub-storage  24  can be moved in the lateral direction by the door storage  30 . 
     The door storage  30  enables the side storage product entrance/exit portion  32  to be exposed between the door  20  and the main body  4  when the door  20  is locked by the door locking mechanism  50 . The side storage product entrance/exit portion  32  can be an opening opened in the lateral direction in the door storage  30 . Products can be inserted into the door storage  30  through the side storage product entrance/exit portion  32  at a side position, front side position or front position of the door storage  30 . The products can be extracted to the side position, front side position or front position of the door storage  30  through the side storage product entrance/exit portion  32  from the door storage  30 . For example, the storage products are inserted into the door storage  30  at the side of the side storage product entrance/exit portion  32 , based on the door storage  30 , and are extracted at the side of the side storage product entrance/exit portion  32  from the door storage  30 . The side storage product entrance/exit portion  32  can be an opening through which the storage products are inserted/extracted into/from the door storage  30  at the side of the side storage product entrance/exit portion  32 . The door storage  30  may have a box shape. The side storage product entrance/exit portion  32  may be located at one of the left and right sides of the door storage  30 , which is more distant from the rotational center of the door  20 . The side storage product entrance/exit portion  32  may have a gap with the inner wall of the storage room  2  when the door  20  is closed. The cooling air in the storage room  2  may flow into the door storage  30  through the side of the side storage product entrance/exit portion  32 . The cooling air in the door storage  30  may flow out to the storage room  2  through the side of the side storage product entrance/exit portion  32 . The side storage product entrance/exit portion  32  may be located at one of the left and right surfaces of the door storage  30 . The side of the door storage  30 , opposite to the side storage product entrance/exit portion  32 , can be blocked. The rear surface of the door storage  30  can be blocked. The upper and lower surfaces of the door storage  30  can be blocked. A cooling air entrance/exit hole through which the cooling air in the storage room  2  is entered/exited may be defined in the door storage  30 . The cooling air entrance/exit hole may be spaced apart from the side storage product entrance/exit portion  32 . The door storage  30  may extend along the vertical direction. The height of the door storage  30  can be higher than that of the sub-storage  24 . The lateral width of the door storage  30  can be shorter than that of the sub-storage  24 . The door storage  30  can be mounted in a single or plural numbers to the door  20 . A plurality of side storage product entrance/exit portions  32  can be formed in the door storage  30 , and a support which allows the storage products to be put thereon while partitioning the inside of the door storage  30  into a plurality of storage spaces can be disposed inside the door storage  30 . In a case where a plurality of storage spaces are formed inside the door storage  30 , the side storage product entrance/exit portion  32  can be formed for each storage space. The door storage  30  can be mounted in plural numbers on the rear surface of the door  20 . The plurality of door storages  30  can be mounted to be vertically spaced apart from one another. 
     As shown in  FIGS. 4-6 , the door locking mechanism  50  can include a moving locking member  51  mounted to the door  20  so as to be ascended/descended, a door latch  52  fixed and mounted to the door  20 , and a locking member holder  54  locking the moving locking member  51  or releasing the locking of the moving locking member  51  when the door  20  is rotated to the acute opening angle. A holding groove portion  53  into which the moving locking member  51  is inserted to be held by the locking member holder  54  can be formed in the locking member holder  54 . 
     An ascending/descending guide disposed to ascend/descend the moving locking member  51  can be formed in the door  20 . The moving locking member  51  can be ascended or descended under the guidance of the ascending/descending guide. 
     The moving locking member  51  can include a striker held to the door latch  52  or of which locking is released, and a locking body locked to the locking member holder  54  or of which locking is released. The striker can be mounted to protrude to the locking body. The moving locking member  51  can have a gradient portion at one upper portion thereof. The gradient portion can be formed in the locking body. 
     The door latch  52  can have a holding mode in which the moving locking member  51  is descended to be held thereto. The door latch  52  can have a holding release mode in which the moving locking member  51  is ascended while releasing the holding of the moving locking member  51 . The door latch  52  can include a latch casing mounted in the door  20 . The door latch  52  can include a rotary member rotatably mounted in the latch casing. The rotary member can be mounted to restrict the moving locking member  51  in the holding mode of the door latch  52  and to upwardly push the moving locking member  51  in the holding release mode. The door latch  52  can include a spring elastically supporting the rotary member. The spring can elastically support the rotary member in the direction where the moving locking member  51  is pushed upward. 
     The holding groove portion  53  may be recessed at one side of the locking member holder  54 . The holding groove portion  53  can be formed so that a portion of the moving locking member  51  is inserted into the holding groove portion  53  when the door  20  is positioned at the acute opening angle. When the door  20  is rotated in the door-close direction, the holding groove portion  53  can have a slope portion allowing the gradient portion of the moving locking member  51  to be guided therealong. When the door  20  is rotated in the door-close direction, the moving locking member  51  can be descended while the gradient portion overcomes the slope portion of the holding groove portion  53 . 
     The locking member holder  54  can be mounted to always maintain a predetermined position regardless of the opening angle of the door  20 . The door  20  can be rotatably connected to the hinge members  22  and  23  shown in  FIG. 3 . The locking member holder  54  can be fixed and mounted to one of the hinge members  22  and  23 , or can be fixed and mounted to the main body  4 . One of the hinge members  22  and  23  shown in  FIG. 3  can include a main body fixing member  55  mounted to protrude from the main body  4  as shown in  FIG. 5 . The locking member holder  54  can be fixed and mounted to the main body fixing member  55 , and the door  20  can be rotatably connected to the locking member holder  54 . That is, the locking member holder  54  can constitute, together with the main body fixing member  55 , one of the hinge members  22  and  23 . The moving locking member  51  can be moved together with the door  20  when the door  20  is rotated, and the locking member holder  54  can be positioned on the moving trace of the moving locking member  51 . In a case where the door latch  52  is in the holding release mode, the moving locking member  51  can be blocked by the locking member holder  54  so that the ascending of the moving locking member  51  in the upper direction is limited. The arbitrary separation of the moving locking member  51  in the upper direction can be limited. 
     If the door latch  52  is in the holding mode, the moving locking member  51  can descended toward the door latch  52  so as to be held to the door latch  52 . When the door  20  is rotated, the moving locking member  51  can be moved along the rotational trace of the door  20 . At this time, the moving locking member  51  can pass through a lower portion of the holding groove portion  52  while not being held to the holding groove portion  53 . 
     If the door latch  52  is in the holding release mode, the moving locking member  51  can be ascended in the upper direction by the door latch  52 . When the door  20  is rotated, the moving locking member  51  can be moved along the rotational trace of the door  20 . When passing through the lower portion of the holding groove portion  53 , at least a portion of the moving locking member  51  can be inserted into the holding groove portion  53  so as to be locked to the locking member holder  54 . The moving locking member  51  can be held to the locking member holder  54  by entering into the holding groove portion  53  while being moved by the door  20 . The door  20  is not rotated any more by the locking of the moving locking member  51  to the holding groove portion  53 , and the current positions of the door  20  and the moving locking member  51  can be maintained. That is, the door  20  maintains the position at which the moving locking member  51  is locked to the holding groove portion  53 . The door  20  is locked in the door-open direction. 
     The refrigerator can include a door-close maintaining mechanism  70  and  72  maintaining a door-close state of the door  20  or releasing the door-close state of the door  20 , and a manipulation member  74  interlocked with the door manipulation portion  60  in the manipulation of the door manipulation portion  60  so as to release the closing of the door-close maintaining mechanism  70  and  72 . 
     The door-close maintaining mechanism  70  and  72  can include a door locking member  70  fixed and mounted to the door  20 , and a main body latch  72  mounted to the main body  4 . 
     The door locking member  70  can be mounted to protrude backward from the rear surface of the door  20 . The door locking member  70  can include a striker held to the main body latch  72  or of which holding is released. The door locking member  70  can include a fastening portion fastened to the door  20  by a fastening member, such as a screw. 
     The main body latch  72  holds the door locking member  70  or releases the holding of the door locking member  70 . The main body latch  72  can include a latch casing mounted to the main body  4 . The main body latch  72  can include a rotary member rotatably mounted in the latch casing. The rotary member can be mounted to restrict the door locking member  70  in the holding mode of the main body latch  72  and to push forward the door locking member  70  in the holding release mode of the main body latch  72 . The main body latch  72  can include a spring elastically supporting the rotary member. The spring can elastically support the rotary member in the direction where the door locking member  70  is pushed forward. The main body latch  72  can have a press button  73  allowing the holding of the door locking member  70  to be released. If the press button  73  is not pressed, the main body latch  72  enables the door locking member  70  to be held thereto. If the press button  73  is pressed, the main body latch  72  enables the holding of the door locking member  70  to be released by pushing forward the door locking member  70 . When being protruded forward from the main body latch  72 , the press button  73  enables the rotary member to be rotated to the position at which the rotary member restricts the door locking member  70 . When being pressed backward, the press button  73  enables the rotary member to be rotated to the position at which the door locking member  70  is pushed forward while releasing the holding of the rotary member to the door locking member  70 . 
     The manipulation member  74  can be mounted in the door  20 . The manipulation member  74  can be implemented as a power transmission member such as a Revana wire mounted in the door  20 . The manipulation member  74  can be rotatably mounted in the door  20 , and one side of the manipulation member  74  can be disposed to contact the door manipulation portion  60 . When the door manipulation portion  60  is pressed, the manipulation member  74  can be rotated to press the press button  73 . The manipulation member  74  can include a prominence  75  protruded backward from the rear surface of the door  20 . The prominence  75  can press the press button  73 . 
     The refrigerator can further include a door locking mechanism connecting member  76  allowing the mode of the door latch  52  to be changed into the holding release mode by being interlocked with the door manipulation portion  60  and connected to the door latch  52 . A portion of the door locking mechanism connecting member  76  can be inserted into the door latch  52  so as to rotate the rotary member of the door latch  52 . The door locking mechanism connecting member  76  can rotate the rotary member of the door latch  52  to the position at which the moving locking member  51  is pushed upward while releasing the holding of the rotary member to the moving locking member  51 . The door locking mechanism connecting member  76  can include one or more levers  77  and  78  mounted in the door  20 . The one or more levers  77  and  78  can be rotatably mounted in the door  20 . The one or more levers  77  and  78  can include a driving lever  77  horizontally positioned inside the door  20  and rotatably connected to the door  20 , and a driven lever  78  vertically positioned inside the door  20  and rotatably connected to the door  20 . The driven lever  78  can be disposed to contact the driving lever  77 . The driven lever  78  can be rotated by the driving lever  77  when the driving lever  77  is rotated. A portion of the driven lever  78  can be disposed to be inserted into the door latch  52 . The driven lever  78  can be disposed to rotate the rotary member of the door latch  52 . When the press button  73  is pressed by the manipulation of the door manipulation portion  60 , the door locking mechanism connecting member  76  enables the mode of the door latch  52  to be changed into the holding release mode. When the closing of the door  20  is released by the manipulation member  74 , the door locking mechanism connecting member  76  enables the mode of the door latch  52  to be changed into the holding release mode. The door locking mechanism connecting member  76  can be disposed to contact the door manipulation portion  60  or the manipulation member  74 . If the user manipulates the door manipulation portion  60 , the door locking mechanism connecting member  76  enables the mode of the door latch  52  to change into the holding release mode by the door manipulation portion  60  or the manipulation member  74 . Simultaneously, the manipulation member  74  can press the press button  73 . 
     The refrigerator can further include an auxiliary manipulation portion  80  mounted in the door  20 , and an auxiliary manipulation member  82  interlocked with the auxiliary manipulation portion  80  in the manipulation of the auxiliary manipulation portion  80  so as to release the closing of the door-close maintaining mechanism  70  and  72 . 
     The auxiliary manipulation portion  80  can be mounted at a position separate from that of the door manipulation portion  60 . The auxiliary manipulation portion  80  can be mounted to one of the left and right sides of the door  20 , which is more distant from the rotational center of the door  20 . The auxiliary manipulation portion  80  can be disposed to be pressed by a recessed portion  81  formed in the door  20 . 
     The auxiliary manipulation member  82  can be mounted in the door  20 . The auxiliary manipulation member  82  can be implemented as a power transmission member such as a Revana wire mounted in the door  20 . The auxiliary manipulation member  82  can be rotatably mounted in the door  20 , and one side of the auxiliary manipulation member  82  can be disposed to contact the auxiliary manipulation portion  80 . When the auxiliary manipulation portion  80  is pressed, the auxiliary manipulation member  82  can be rotated to press the press button  73 . The auxiliary manipulation member  82  can include a prominence  83  protruded backward from the rear surface of the door  20 . The prominence  83  can press the press button  73 . 
     In the refrigerator, the press button  73  can be pressed in the manipulation of the door manipulation portion  60  or the auxiliary manipulation portion  80 , and the door  20  can be rotated in the door-open direction while the main body latch  72  is pushing forward the door locking member  70 . 
     In a case where the refrigerator includes the door-close maintaining mechanism  70  and  72 , the door manipulation portion  60 , the door locking mechanism connecting member  76  and the door locking mechanism  50  can perform a function of locking the door  20  at the acute opening angle, and the door manipulation portion  60 , the manipulation member  74 , the auxiliary manipulation portion  80  and the auxiliary manipulation member  82  can perform a function of releasing the door-close state of the door  20 . 
     In the refrigerator, the door manipulation portion  60 , the manipulation member  74 , the door locking mechanism connecting portion  76  and the door locking mechanism  50  can constitute the door manipulation mechanism. The door manipulation mechanism can manipulate the door-close maintaining mechanism  70  and  72 . In addition, the door manipulation mechanism can lock the door  20  at the acute opening angle where the side storage product entrance/exit portion  32  is exposed between the door  20  and the main body  4 . 
     In the refrigerator, the door can be rotated in the door-open direction while releasing the door-close state of the door  20  in the manipulation of the door manipulation portion  60 . At this time, the door locking mechanism  50  enables the door  20  to be locked at the acute opening angle. On the other hand, the door  20  can be rotated in the door-open direction while releasing the door-close state of the door  20  in the manipulation of the auxiliary manipulation portion  80 . At this time, the door  20  can be rotated to the maximum opening angle. 
     The refrigerator may not include the door-close maintaining mechanism  70  and  72 . In a case where the door-close maintaining mechanism  70  and  72  is not mounted in the door  20 , the manipulation member  74  can be protruded toward the main body  4  in a state in which the manipulation member  74  is mounted in the door  20 . The manipulation member  74  can apply an external force to the main body  4  by being protruded toward the main body  4  in the manipulation of the door manipulation portion  60 . The door  20  can be rotated by the reaction of a force with which the manipulation member  74  pushes the main body  4 . In a case where the door-close maintaining mechanism  70  and  72  is not mounted in the door  20 , the auxiliary manipulation member  82  can be protruded toward the main body  4  in a state in which the auxiliary manipulation member  82  is mounted in the door  20 . The auxiliary manipulation member  82  can apply an external force to the main body  4  by being protruded toward the main body  4  in the manipulation of the auxiliary manipulation portion  80 . The door  20  can be rotated in the door-open direction by the reaction of a force with which the auxiliary manipulation member  82  pushes the main body  4 . 
       FIG. 7  illustrates an example process for opening/closing the door of the refrigerator. The process can include opening the side storage product entrance/exit portion (S 1  and S 2 ). 
     The opening of the side storage product entrance/exit portion (S 1  and S 2 ) can be performed when a user manipulates the door manipulation portion  60 . The user can manipulate the door manipulation portion  60  when the door  20  is positioned to cover the front surface of the storage room  2 . The user can manipulate the door manipulation portion  60  by pressing, pulling or rotating the door manipulation portion  60 . 
     In the opening of the side storage product entrance/exit portion (S 1  and S 2 ), the door  20  can be locked at the opening angle where the side storage product entrance/exit portion  32  of the door storage  30  is opened, and the opening state of the side storage product entrance/exit portion  32  is maintained. 
     When the door manipulation portion  60  is manipulated, the door locking mechanism connecting member  76  can be interlocked with the door manipulation portion  60  so as to manipulate the door locking mechanism  50  in the locking mode. The door locking mechanism  50  enables the moving locking member  51  to be ascended while releasing the holding of the moving locking member  51  to the door latch  52 . The moving locking member  51  can be moved by the door  20  while being ascended upward by the door latch  52 . 
     When the door manipulation portion  60  is manipulated, the manipulation member  74  can release the closing of the door-close maintaining mechanism  70  and  72 . The manipulation member  74  can press the press button  73  of the main body latch  72 , and the main body latch  72  can push forward the door locking member  70  while releasing the holding of the door locking member  70 . In the refrigerator, as the holding of the door locking member  70  is released by the main body latch  72 , the door-close state of the door  20  can be released, and the door  20  can be rotated about the rotational center thereof. 
     The door  20  can be rotated in a state in which the moving locking member  51  is ascended, and the side storage product entrance/exit portion  32  of the door storage  30  is gradually exposed through the gap between the door  20  and the main body  4 . When the door  20  is rotated, the moving locking member  51  can be moved to the lower portion of the holding groove portion  53  of the locking member holder  54 . The moving locking member  51  can be inserted into the holding groove portion  53  of the locking member holder  54  by a force with which the moving locking member  51  is pushed upward. If the moving locking member  51  is inserted into the holding groove portion  53  of the locking member holder  54 , the moving locking member  51  can be held to the locking member holder  54  so that the position of the moving locking member  51  is fixed. The door  20  is not rotated any more by fixing the position of the moving locking member  51 , and the position of the door  20  is fixed. When the moving locking member  51  is inserted into the holding groove portion  53  of the locking member holder  54 , the door  20  can be positioned at the acute opening angle where the side storage product entrance/exit portion  32  is entirely exposed between the door  20  and the main body  4 , and the user can insert or extract storage products into/from the door storage  30  through the side storage product entrance/exit portion  32 . The user can insert or extract storage products into/from the door storage  30  in a state in which the door  20  is not excessively opened. Thus, the refrigerator can minimize the leakage of cooling air between the door  20  and the main body  4 . 
     The process can include releasing the locking of the door (S 3  and S 4 ) after the opening of the side storage product entrance/exit portion (S 1  and S 2 ). 
     Releasing the locking of the door (S 3  and S 4 ) can be performed by closing the door  20 . If the user closes the door  20 , the door  20  can be rotated in the opposite direction to that in the opening of the side storage product entrance/exit portion (S 1  and S 2 ). The moving locking member  51  which has been inserted into the holding groove portion  53  of the locking member holder  54  can be moved to the position except the lower portion of the holding groove portion  53  while climbing over the lower surface of the locking member holder  54 , and held to the door latch  52 . That is, the locking of the door locking mechanism  50  is released. As the rotation of the door  20  is continued, the door  20  is adhered closely to the main body  4 . The door  20  is rotated to the position at which the door  20  covers the front surface of the storage room  2 . When the door  20  is positioned to cover the front surface of the storage room  2 , the door locking member  70  is held to the main body latch  72 , and the door  20  is maintained in the door-close state thereof. 
     The process can include rotating the door to an opening angle greater than that in the opening of the side storage product entrance/exit portion (S 5  and S 6 ) after the releasing of the locking of the door (S 3  and S 4 ). 
     The user can manipulate the auxiliary manipulation portion  60  after the releasing of the locking of the door (S 3  and S 4 ). When the auxiliary manipulation portion  80  is manipulated, the auxiliary manipulation member  82  can release the closing of the door-close maintaining mechanism  70  and  72 . The auxiliary manipulation member  82  can press the press button  73  of the main body latch  72 , and the main body latch  72  can push forward the door locking member  70  while releasing the holding of the door locking member  70 . In the refrigerator, as the holding of the door locking member  70  to the main body latch  72  is released, the closing state of the door locking member  70  can be released, and the door  20  can be rotated about the rotational center thereof. If the user rotates the door  20  while holding the door  20 , the door  20  can be continuously rotated by passing through the position that is the opening angle of the door  20  in the opening of the side storage product entrance/exit portion (S 1  and S 2 ). The door  20  can be rotated to the position at which the rear surface of the door  20  is entirely exposed forward. The door  20  can be rotated up to the maximum opening angle, and the user can insert/extract the storage products into/from not only the door storage  30  but also the sub-storage  24  mounted to the door  20 . The user can also insert/extract the storage products into/from the storage  8  of the storage room  2 . 
     In the process, the closing of the door can be performed after the rotating of the door (S 5  and S 6 ). The user can rotate the door  20  in the opposite direction to the door-open direction while holding the door  20 . The door  20  is adhered closely to the main body  4  and then rotated to cover the front surface of the storage room  2 . When the door  20  is positioned to cover the front surface of the storage room  2 , the door locking member  70  is held to the main body latch  72 , and the door  20  can be again maintained in the door-close state thereof. 
     In the process, the closing of the door can be performed after the rotating of the door (S 5  and S 6 ), and the opening of the side storage product entrance/exit portion (S 1  and S 2 ) can be performed after the closing of the door. 
     Meanwhile, the process is not limited to the operations described above, and the opening of the side storage product entrance/exit portion (S 1  and S 2 ) can be performed by rotating the door  20  in the door-close direction of the door  20  while manipulating the door manipulation portion  60  after the rotating of the door (S 5  and S 6 ). The door  20  is rotated to an opening angle greater than the acute opening angle at which the door  20  is locked by the door locking mechanism  50 , and then rotated to the acute opening angle at which the door is locked by the door locking mechanism  50 . Thus, the door  20  can be fixed to the door locking mechanism  50 . In the process, the releasing of the locking of the door (S 3  and S 4 ) can be performed after the opening of the side storage product entrance/exit portion (S 1  and S 2 ). That is, the rotating of the door (S 5  and S 6 ), the opening of the side storage product entrance/exit portion (S 1  and S 2 ), and the releasing of the locking of the door (S 3  and S 4 ) can be sequentially performed. 
     As described above, structure and operational examples have been described in detail with reference to appended drawings. However, the disclosure is not limited to the above and various modifications and implementations are possible. According to the refrigerator described above, storage products may be inserted/extracted into/from the door storage in the state in which the position of the door is fixed to the acute opening angle at which the side storage product entrance/exit portion is exposed. These features may make it possible to keep a large quantity of storage products in the door storage while minimizing the leakage of cooling air in the storage room. 
     Further, the door may be opened to an opening angle at which the side storage product entrance/exit portion is exposed through a user&#39;s convenient manipulation. 
     Further, storage products may be inserted/extracted into/from the door storage in the state in which the position of the door is fixed to the acute opening angle at which the side storage product entrance/exit portion is exposed. These features may make it unnecessary to insert/extract the storage products into/from the storage room in the state in which a user is holding the door. As such, user&#39;s convenience may be improved. 
     Further, the releasing of the door-close state of the door and the exposure of the side storage product entrance/exit portion may be simultaneously performed through a user&#39;s convenient manipulation, so that the manipulation of the refrigerator is convenient.