Abstract:
A door includes a door body, a pair of rotating shafts, a pair of opening/closing levers and an inhibiting member. The pair of rotating shafts rotate the door body toward either one of the left and right directions. The pair of rotating shafts are provided on each of the left and right sides of the door body. The pair of rotating shafts are vertically slidable. The pair of opening/closing levers are provided on each of the left and right sides of the door body. The opening/closing lever is connected to the rotating shaft on the same side of the door body. The opening/closing lever acommodates the connected rotating shaft within the door body by rotation. The inhibiting member inhibits one of the rotating shafts from being accommodated within the door body by operating simultaneously with rotation of the opening/closing lever connected to the other rotating shaft.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an opening/closing mechanism of a door in a disk array device or the like. 
         [0003]    2. Description of the Related Art 
         [0004]    The disk array device mounts hard disks or the like constituting redundant array of inexpensive disks (RAID) inside a rack. When performing maintenance of the disk array device, such as replacement of a hard disk, opening/closing of the door is needed. In general, the door is configured to be opened or closed only from either one of the left and right sides. 
         [0005]    When attempting to install a disk array device, a user has hitherto needed to determine where the device to be positioned in accordance with an opening/closing direction of the door. There is, therefore, a demand for a disk array device having a door that can be opened/closed from both the left and right sides. 
       SUMMARY 
       [0006]    It is an object of the present invention to provide a door that can be opened/closed from both of the left and right sides, and a rack. 
         [0007]    According to an aspect of an embodiment, a door is for opening/closing a rack body accommodating an electronic device. The rack includes the rack body, and the door for opening/closing a rack body, the door being engaged with the rack body at predetermined positions. 
         [0008]    The door includes a door body, a pair of rotating shafts, a pair of opening/closing levers and an inhibiting member. The pair of rotating shafts rotate the door body toward either one of the left and right directions. The pair of rotating shafts are provided on each of the left and right sides of the door body. The pair of rotating shafts are vertically slidable. The pair of opening/closing levers are provided on each of the left and right sides of the door body. The opening/closing lever is connected to the rotating shaft on the same side of the door body. The opening/closing lever acommodates the connected rotating shaft within the door body by rotation. The inhibiting member inhibits one of the rotating shafts from being accommodated within the door body by operating simultaneously with rotation of the opening/closing lever connected to the other rotating shaft. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a perspective view of a rack according to a first embodiment; 
           [0010]      FIGS. 2A and 2B  are diagrams each showing an opened state of a door of the rack according to the first embodiment; 
           [0011]      FIGS. 3A and 3B  are diagrams each showing an opening/closing mechanism of the door according to the first embodiment; 
           [0012]      FIG. 4  is a diagram of a locking mechanism of an opening/closing lever of the door according to the first embodiment; 
           [0013]      FIG. 5  is a diagram of a closed state of the door according to the first embodiment; 
           [0014]      FIGS. 6A and 6B  are explanatory diagrams ( 1 ) of operations when the door according to the first embodiment is to be opened from the left side; 
           [0015]      FIG. 7  is an explanatory diagram ( 2 ) of operations when the door according to the first embodiment is to be opened from the left side; 
           [0016]      FIG. 8  is a diagram of operations when the door according to the first embodiment is to be opened from the right side; 
           [0017]      FIG. 9  is a diagram of an opening/closing mechanism of the door according to a second embodiment of the present invention; 
           [0018]      FIG. 10  is a diagram of a closed state of the door according to the second embodiment; 
           [0019]      FIG. 11  is a diagram of operations when the door according to the second embodiment is to be opened from the left side; and 
           [0020]      FIG. 12  is a diagram of operations when the door according to the second embodiment is to be opened from the right side. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First Embodiment  
       [0021]      FIG. 1  is a perspective view of a rack according to a first embodiment. 
         [0022]    The rack  1  includes a rack body  2  and a door  3 . The rack  1  is, for example, one used for disk array device, and mounts a plurality of hard disks constituting RAIDs in the rack body  2 . 
         [0023]    The door  3  has opening/closing levers  14  and  24  for opening/closing the door  3 , the opening/closing levers  14  and  24  being located on the left and right sides of the door  3  in the front of the rack  1 , and in the neighborhood of a heightwise center of the door  3 . The opening/closing levers  14  and  24  in  FIG. 1  are each in a stopping state. 
         [0024]      FIG. 2A and 2B  are diagrams each showing an opened state of the door of the rack according to the first embodiment. The rack body  2  has four bearing section  6  for being engaged with the door  3 . The door  3  includes also a door body  7  and an opening/closing mechanism  8 . 
         [0025]    When an operator rotates clockwise the opening/closing lever  14  shown in  FIG. 1 , and pulls it forward, the door  3  is opened from the left side.  FIG. 2A  shows a state where the door  3  is opened from the left side. 
         [0026]    On the other hand, when the operator rotates clockwise the opening/closing lever  24  shown in  FIG. 1 , and pulls it forward, the door  3  is opened from the right side.  FIG. 2B  shows a state where the door  3  is opened from the right side. 
         [0027]      FIGS. 3A and 3B  are diagrams each showing an opening/closing mechanism of the door according to the first embodiment.  FIG. 3A  is a rear view of the door  3 . 
         [0028]    Each of the upward-downward direction, left-right direction, and rotational direction denotes a direction as viewed from the plan of the rear view of the door  3  shown in  FIG. 3 . Directions as viewed from the operator side, that is, from the front side of the door  3 , will be described on an individual basis. 
         [0029]    In the door body  7 , the opening/closing mechanism  8  includes rotating shafts  11  and  12  on the right side, a rotation lock bar  13  on the right side, an opening/closing lever  14  on the right side, and a rotation support section  15  on the right side. Furthermore, in the door body  7 , the opening/closing mechanism  8  includes rotating shafts  21  and  22  on the left side, a rotation lock bar  23  on the left side, an opening/closing lever  24  on the left side, and a rotation support section  25  on the left side. 
         [0030]    The rotating shafts  11  and  12 , respectively, are provided upward and downward on the right side in the door body  7 . The rotating shafts  11  and  12  are connected to the opening/closing lever  14 . 
         [0031]    As shown in  FIG. 2A , when the door  3  of the rack  1  is opened from the left side as viewed from the operator, the rotating shafts  11  and  12 , respectively, move downward and upward so as to be disengaged from the rack body  2  and accommodated within the door body  7 . On the other hand, as shown in  FIG. 2B , when the door  3  of the rack  1  is opened from the right side as viewed from the operator, the rotating shafts  11  and  12  serve as a shaft for rotating the door  3 . 
         [0032]    The rotating shafts  21  and  22 , respectively, are provided upward and downward on the left side in the door body  7 . The rotating shafts  21  and  22  are connected to the opening/closing lever  24 . 
         [0033]    As shown in  FIG. 2B , when the door  3  is opened from the right side as viewed from the operator, the rotating shafts  21  and  22 , respectively, move downward and upward so as to be disengaged from the rack body  2  and accommodated within the door body  7 . As shown in  FIG. 2A , when the door  3  is opened from the left side as viewed from the operator, the rotating shafts  21  and  22  serve as a shaft for rotating the door  3 . 
         [0034]    The rotation lock bar  13  is provided on the right side in the door body  7 . One end of the rotation lock bar  13  is disposed adjacently along the rotational direction of the opening/closing lever  14 , and the other end thereof is disposed adjacently to the rotation lock bar  23 . When the one end of the rotation lock bar  13  is depressed by counterclockwise rotation of the opening/closing lever  14 , it rotates clockwise around the rotation support section  15 . Under this rotation, the other end of the rotation lock bar  13  makes contact with the rotation lock bar  23 . As a result, the rotation lock bar  13  inhibits the rotation lock bar  23  from clockwise rotation. 
         [0035]    The rotation lock bar  23  is provided on the left side in the door body  7 . One end of the rotation lock bar  23  is disposed adjacently along the rotational direction of the opening/closing lever  24 , and the other end thereof is disposed adjacently to the rotation lock bar  13 . When the one end of the rotation lock bar  23  is pushed up by counterclockwise rotation of the opening/closing lever  24 , it rotates clockwise around the rotation support section  25 . Under this rotation, the one end of the rotation lock bar  23  makes contact with the rotation lock bar  13 . As a result, the rotation lock bar  23  inhibits the rotation lock bar  13  from clockwise rotating. 
         [0036]    The opening/closing lever  14  is provided on the right side in the door body  7 . By rotating counterclockwise from the stoppage position to a predetermined position, the opening/closing lever  14  moves the rotating shaft  11  downward and moves the rotating shaft  12  upward, to thereby release engagement between the rack body  2  and the respective bearing sections  6 , and accommodate the rotating shafts  11  and  12  within the door body  7 . When the operator pulls forward the opening/closing lever  14 , the door body  7  can be opened from the left side as viewed from the operator side. The opening/closing lever  14  also depresses the rotation lock bar  13 . 
         [0037]    The opening/closing lever  14  has a lock mechanism. When the opening/closing lever  14  rotates counterclockwise and performs locking operation at a prediction position, the rotation lock bar  13  and the rotating shafts  11  and  12  are locked together. 
         [0038]    When the door is to be closed, the operator accommodates the door  3  within the rack body  2 , and then returns the opening/closing lever  14  to the stoppage position. As a consequence, the rotating shaft  11  connected to the opening/closing lever  14  moves upward, and the rotating shaft  12  connected thereto moves downward, whereby they are engaged with the respective bearing sections  6  in the rack body  2 . 
         [0039]      FIG. 4  is a diagram of a locking mechanism of an opening/closing lever of the door according to the first embodiment. And  FIG. 4  shows a well-known example of the locking mechanism. 
         [0040]    The locking mechanism of the opening/closing lever  14  is constituted by a lock lever  42  provided on a handle  41 , and grooves  43  in a flange section  44  provided in the door body  7 . 
         [0041]    When a front end of the lock lever  42  is engaged with the grooves  43 , rotation of the handle  41  is locked. On the other hand, when the lock lever  42  is depressed and the engagement between the front end and the grooves  43  is released, rotation of the handle  41  is unlocked. Broken line regarding the lock lever  42  in  FIG. 4  shows a state where the rotation is unlocked, while a solid line shows a state where the rotation is locked. 
         [0042]    Now, operations of the opening/closing lever  14  will be described. 
         [0043]    In order to open the door  3 , firstly in the stoppage position, when the operator grasps the handle  41  while depressing the lock lever  42 , lock is released. In this state, when the operator rotates the handle  41  in the clockwise direction as viewed from the operator side from the stoppage position to a predetermined position, and then releases the lock lever  42 , the front end of the lock lever  42  is engaged with the grooves  43  in the flange section  44 , and the handle  41  is locked. Now this is a state allowing the door  3  to be opened. 
         [0044]    On the other hand, in order to close the door  3 , the operator grasps the handle  41  while depressing the lock lever  42 , and rotates back the handle  41  in the counterclockwise direction as viewed from the operator from the predetermined position to the stoppage position. Then, upon releasing the lock lever  42 , the front end of the lock lever  42  is engaged with the grooves  43  in the flange section  44 , and the handle  41  is locked. 
         [0045]    Now, description is returned to the explanation with reference to  FIG. 3 . 
         [0046]    The opening/closing lever  24  is provided on the left side in the door body  7 . By rotating counterclockwise from the stoppage position to the predetermined position, the opening/closing lever  24  moves the rotating shaft  21  downward and moves the rotating shaft  22  upward, to thereby release engagement between the rack body  2  and the respective bearing sections  6 , and accommodate the rotating shafts  21  and  22  within the door body  7 . When the operator pulls forward the opening/closing lever  24 , the door body  7  can be opened from the right side as viewed from the operator side. The opening/closing lever  24  also pushes up the rotation lock bar  23 . 
         [0047]    The opening/closing lever  24  has a lock mechanism. When the opening/closing lever  24  rotates counterclockwise and performs locking operation at a prediction position, the rotating shafts  21  and  22  and the rotation lock bar  23  are locked together. 
         [0048]    When the door is to be closed, the operator accommodates the door  3  within the rack body  2 , and then returns the opening/closing lever  24  to the stoppage position. As a consequence, the rotating shaft  21  connected to the opening/closing lever  24  moves upward, and the rotating shaft  22  connected thereto moves downward, whereby they are engaged with the respective bearing sections  6  in the rack body  2 . The locking mechanism of the opening/closing lever  24  is the same as that of the opening/closing lever  14 . 
         [0049]    The rotation support section  15  is a support section for supporting the rotation lock bar  13 , while the rotation support section  25  is a support section for supporting the rotation lock bar  23 . The rotation support section  15  and the rotation support section  25  each has a spring. When the rotation lock bar  13  or the rotation lock bar  23  rotates clockwise, the spring is compressed. As a result, when the opening/closing levers  14  and  24  clockwise rotate and return to the stoppage position, the rotation support sections  15  and  25  returns to the original stoppage position. 
         [0050]      FIG. 3B  is a diagram of a spring section  31 .  FIG. 3B  shows an example of spring section  31  in which the rotating shaft  12  is arranged. Spring sections  31  in which the other rotating shafts  11 ,  21 , and  22  are arranged, have the same structure as the spring section  31  in which the rotating shaft  12  is arranged. The spring sections  31  are fixed to the door body  7 , and they each incorporate a spring. Each of the rotating shafts  11 ,  12 ,  21 , and  22  is arranged in a spring. 
         [0051]    When the door  3  is in a closed state and the rotating shafts  11  and  12 , and the rotating shafts  21  and  22  are engaged with the respective bearing sections  6  in the rack body  2 , the springs are each in an uncompressed state. 
         [0052]    On the other hand, when the rotating shafts  11  and  12  are accommodated within the door body  7  by counterclockwise rotation of the opening/closing lever  14 , or when the rotating shafts  21  and  22  are accommodated within the door body  7  by counterclockwise rotation of the opening/closing lever  24 , the compression section  32  connected to each of the rotating shafts  11  and  12 , or the compression section  32  connected to each of the rotating shafts  21  and  22  compresses the spring. 
         [0053]    When the opening/closing lever  14  returns to the stoppage position by its clockwise rotation, the rotating shafts  11  and  12  are engaged with the respective bearing sections  6  in the rack body  2  by restoring forces of the respective springs. Likewise, when the opening/closing lever  24  returns to the stoppage position by its clockwise rotation, the rotating shafts  21  and  22  are engaged with the respective bearing section  6  in the rack body  2 , by restoring forces of the respective springs. 
       (Description of Opening/Closing Operations) 
       [0054]      FIG. 5  is a diagram of a closed state of the door according to the first embodiment.  FIG. 5  illustrates the case where the rotating shafts  11 ,  12 ,  21 , and  22  have jumped out from the door body  7  to thereby be inserted into the respective bearing section  6  in the rack body  2 . The rotation lock bars  13  and  23  remain apart from each other at a predetermined distance without making contact with each other. The opening/closing lever  14  and the opening/closing lever  24  are each located in the stoppage position. 
         [0055]      FIGS. 6A and 6B  are explanatory diagrams ( 1 ) of operations when the door according to the first embodiment is to be opened from the left side as viewed from the operator. 
         [0056]    These diagrams illustrate the case where the door is opened from the left side as viewed from the operator.  FIGS. 6A and 6B  are each a diagram as viewed from the rear surface of the door body  7 . Here,  FIG. 6A  shows the opening/closing lever  14  located in the stoppage position, the rotating shafts  11  and  12 , the rotation lock bar  13 , and the rotation support section  15 . 
         [0057]    In  FIG. 6A , a state before the opening/closing lever  14  rotates counterclockwise is illustrated. Arrows in  FIG. 6A  indicate a counterclockwise moving direction. This corresponds to the case where, in order to open the door from the left side, the operator rotates the opening/closing lever  14  in the clockwise direction as viewed from the operator. 
         [0058]    On the other hand,  FIG. 6B  illustrates a state after the opening/closing lever  14  has rotated counterclockwise. By this rotation, the opening/closing lever  14  moves downward the rotating shaft  11  connected thereto, and moves upward the connected rotating shaft  12  connected thereto. As a result, the rotating shaft  11  is disengaged from the bearing section  6  in the rack body  2 . The rotating shaft  12  is also disengaged from the bearing section  6  in the rack body  2 . 
         [0059]    Simultaneously, the opening/closing lever  14  depresses one end of the rotation lock bar  13 . The one end of the rotation lock bar  13  is adjacent to the opening/closing lever  14 . As a consequence, the rotation lock bar  13  rotates clockwise around the rotation support section  15 . 
         [0060]      FIG. 7  is an explanatory diagram ( 2 ) of operations when the door according to the first embodiment is to be opened from the left side as viewed from the operator. 
         [0061]    By the rotation of the rotation lock bar  13 , the other end of the rotation lock bar  13  makes contact with the rotation lock bar  23 . The other end of the rotation lock bar  13  is adjacent to the rotation lock bar  23 . Since the opening/closing lever  14  is in a state of being locked by the rotation, the rotation lock bar  13  cannot make counterclockwise rotation. 
         [0062]    As a result, the rotation lock bar  23  is inhibited from clockwise rotation by the rotation lock bar  13 , so that the opening/closing lever  24  connected to the rotation lock bar  23  is inhibited from counterclockwise rotation. Consequently, the rotating shafts  21  and  22  remain engaged with the rack body  2 , and so they serve as a shaft for rotating the door  3 . Hence, when the operator pulls forward the opening/closing lever  14 , the door  3  opens from the left side as viewed from the operator. 
         [0063]    Next, description is made of operations when the door  3  that has been opened from the left side is to be closed. 
         [0064]    First, the operator rotates the door  3  and accommodates it within the rack body  2 . Then, the operator rotates the opening/closing lever  14  in the counterclockwise direction as viewed from the operator. By this rotation, the opening/closing lever  14  moves upward the rotating shaft  11  connected thereto, and moves downward the rotating shaft  12  connected thereto. As a result, the rotating shaft  11  is inserted into the bearing section  6  in the rack body  2 . The rotating shaft  12  is also inserted into the bearing section  6  in the rack body  2 . 
         [0065]    Simultaneously, the opening/closing lever  14  releases the rotation lock bar  13  from the depressed state. Consequently, the rotation lock bar  13  rotates counterclockwise around the rotation support section  15 , and returns to the stoppage position. By the rotation of the rotation lock bar  13 , the end of the rotation lock bar  13  is detached from the rotation lock bar  23 . In this manner, the rotation lock bar  23  is released from the inhibition by the rotation lock bar  13 . This results in a state where the door  3  is closed to the rack body  2 . 
         [0066]      FIG. 8  is a diagram of operations when the door according to the first embodiment is to be opened from the right side as viewed from the operator. 
         [0067]    First, in the state shown in  FIG. 5 , the opening/closing lever  24  is rotated counterclockwise. 
         [0068]    By this rotation, the opening/closing lever  24  moves downward the rotating shaft  21  connected thereto, and moves upward the rotating shaft  22  connected thereto. As a result, the rotating shaft  21  is disengaged from the bearing section  6  in the rack body  2 . The rotating shaft  22  is also disengaged from the bearing section  6  in the rack body  2 . 
         [0069]    Simultaneously, the opening/closing lever  24  pushes up one end of the rotation lock bar  23 . The one end of the rotation lock bar  23  is adjacent to the opening/closing lever  24 . As a consequence, the rotation lock bar  23  rotates clockwise around the rotation support section  25 . By the rotation of the rotation lock bar  23 , the other end of the rotation lock bar  23  makes contact with the rotation lock bar  13 . The other end of the rotation lock bar  23  is adjacent to the rotation lock bar  13 . The opening/closing lever  24  is in a state of being locked by the rotation. Consequently, the rotation lock bar  13  is inhibited from clockwise rotation by the rotation lock bar  23 , so that the opening/closing lever  14  connected thereto is inhibited from rotation. As a result, the rotating shafts  11  and  12  remain engaged with the rack body  2 , and so they serve as a shaft for rotating the door  3 . Hence, when the operator pulls forward the opening/closing lever  24 , the door  3  opens from the right side as viewed from the operator. 
         [0070]    Now, description is made of operations when the door  3  that has been opened from the right side is to be closed. 
         [0071]    First, the operator rotates the door  3  and accommodates it within the rack body  2 . Then, the operator rotates the opening/closing lever  24  in the counterclockwise direction as viewed from the operator. 
         [0072]    By this rotation, the opening/closing lever  24  moves upward the rotating shaft  21  connected thereto, and moves downward the rotating shaft  22  connected thereto. As a result, the rotating shaft  21  is inserted into the bearing section  6  in the rack body  2 . The rotating shaft  22  is also inserted into the bearing section  6  in the rack body  2 . 
         [0073]    Simultaneously, the opening/closing lever  24  releases the rotation lock bar  23  from the pushed-up state. Consequently, the rotation lock bar  23  rotates counterclockwise around the rotation support section  25 , and returns to the stoppage position. By the rotation of the rotation lock bar  23 , the end of the rotation lock bar  13  is detached from the rotation lock bar  23 . In this way, the rotation lock bar  13  is released from the inhibition by the rotation lock bar  23 . This results in a state where the door  3  is closed to the rack body  2 . 
         [0074]    In each of the ends of the rotating shafts  11 ,  12 ,  21 , and  22 , there is provided a spring section  31 , and when these rotating shafts are each accommodated within the door body  7 , the spring section  31  is arranged to be compressed by the compression section  32 . So, when the opening/closing lever  14  or the opening/closing lever  24  is returned to the stoppage position, the rotating shafts  11 ,  12 ,  21 , and  22  are allowed to easily jump out from the door body  7 . 
       Second Embodiment  
       [0075]      FIG. 9  is a diagram of an opening/closing mechanism of the door according to a second embodiment of the present invention. 
         [0076]      FIG. 9  illustrates an outline of rear view of a door  4 . The rack according to the second embodiment corresponds to one in which the door  3  in the rack  1  in  FIG. 1  (perspective view) is replaced with a door  4 ; the opening/closing lever  14  is replaced with an opening/closing lever  54 ; and the opening/closing lever  24  is replaced with an opening/closing lever  64 . 
         [0077]    Each of the upward-downward direction, left-right direction, and rotational direction denotes a direction as viewed from the plan of the rear view of the door  4  shown in  FIG. 9 . Directions as viewed from the operator side, that is, from the front side of the door  4  will be described on an individual basis. 
         [0078]    The opening/closing mechanism  9  includes rotating shafts  51  and  52  on the right side, and an opening/closing lever  54  on the right side. The opening/closing mechanism  9  also includes rotating shafts  61  and  62  on the left side, and an opening/closing lever  64  on the right side. Besides, the opening/closing mechanism  9  has a lock bar  71 . 
         [0079]    The second embodiment is different from the first embodiment in that the lock bar  71  is used instead of the rotation lock bars  13  and  23  in the first embodiment, and in that an opening/closing direction of the opening/closing lever  54  is opposite to that of the opening/closing lever  64 . 
         [0080]    When the door  4  is to be opened from the left side as viewed from the operator, the rotating shafts  51  and  52 , respectively, move downward and upward so as to be disengaged from the rack body  2 . On the other hand, when the door  4  is to be opened from the right side as viewed from the operator, the rotating shafts  51  and  52  serve as a shaft for rotating the door  4 . The rotating shafts  51  and  52  are connected to the opening/closing lever  54 . 
         [0081]    When the door  4  is to be opened from the right side as viewed from the operator, the rotating shafts  61  and  62 , respectively, move downward and upward so as to be disengaged from the rack body  2 . On the other hand, when the door  4  is to be opened from the left side as viewed from the operator, the rotating shafts  61  and  62  serve as a shaft for rotating the door  4 . The rotating shafts  61  and  62  are connected to the opening/closing lever  64 . 
         [0082]    As shown in  FIG. 9 , the opening/closing lever  54  is provided on the right side in the door body  7 . By rotating counterclockwise from the stoppage position to a predetermined position, the opening/closing lever  14  moves the rotating shaft  51  downward and moves the rotating shaft  52  upward, to thereby release engagement between the rack body  2  and the respective bearing sections  6 , and accommodate the rotating shafts  51  and  52  within the door body  7 . When the operator pulls forward the opening/closing lever  54 , the door body  7  can be opened from the left side as viewed from the operator side. 
         [0083]    At this time, the opening/closing lever  54  depresses the rotation lock bar  71 . The opening/closing lever  54  has also a lock mechanism. Hence, when the opening/closing lever  54  rotates counterclockwise and performs locking operation at a prediction position, the rotation lock bar  71  and the rotating shafts  51  and  52  are locked together. 
         [0084]    When the door  4  is to be closed, the operator accommodates the door  4  within the rack body  2 , and then returns the opening/closing lever  54  to the stoppage position. As a consequence, the rotating shaft  51  connected to the opening/closing lever  54  moves upward, and the rotating shaft  52  connected thereto moves downward, whereby they are engaged with the respective bearing sections  6  in the rack body  2 . 
         [0085]    The locking mechanism of the opening/closing lever  54  is the same as that of the opening/closing lever  14  in the first embodiment. As shown in  FIG. 9 , the opening/closing lever  64  is provided on the left side in the door body  7 . By rotating clockwise from the stoppage position, the opening/closing lever  64  moves the rotating shaft  61  downward and moves the rotating shaft  62  upward, to thereby release engagement between the rack body  2  and the respective bearing sections  6 , and accommodate the rotating shafts  61  and  62  within the door body  7 . When the operator pulls forward the opening/closing lever  64 , the door body  7  can be opened from the right side as viewed from the operator side. At this time, the opening/closing lever  64  depresses the rotation lock bar  71  by its rotation. 
         [0086]    The opening/closing lever  64  has a lock mechanism. Hence, when the opening/closing lever  64  rotates clockwise and performs locking operation at a prediction position, the lock bar  71  and the rotating shafts  61  and  62  are locked together. 
         [0087]    When the door is to be closed, the operator accommodates the door  4  within the rack body  2 , and then returns the opening/closing lever  64  to the stoppage position. As a consequence, the rotating shaft  61  connected to the opening/closing lever  64  moves upward, and the rotating shaft  62  connected thereto moves downward, whereby they are engaged with the respective bearing sections  6  in the rack body  2 . The locking mechanism of the opening/closing lever  64  is the same as that of the opening/closing lever  14 . 
         [0088]    The lock bar  71  is connected to the rotating shaft  51  and the rotating shaft  52 . When the opening/closing lever  54  rotates counterclockwise, the lock bar  71  inhibits the opening/closing lever  64  from rotating. On the other hand, when the opening/closing lever  64  rotates clockwise, the lock bar  71  inhibits the opening/closing lever  54  from rotating. 
       (Description of Opening/Closing Operations) 
       [0089]      FIG. 10  is a diagram of a closed state of the door according to the second embodiment, wherein a state where the door  4  is closed and accommodated within the rack body  2 , is illustrated.  FIG. 10  shows the case where rotating shafts  51 ,  52 ,  61 , and  62  have jumped out from the door body  7  to thereby be inserted into the respective bearing sections  6  in the rack body  2 . Here, the rotation lock bars  71 , and opening/closing lever  54  and  64  are located in the stoppage position. 
         [0090]      FIG. 11  shows operations when the door according to the second embodiment is to be opened from the left side as viewed from the operator.  FIG. 11  is a rear view of the door body  7 . 
         [0091]    First, in the state shown in  FIG. 10 , the opening/closing lever  54  is rotated in the counterclockwise direction, as indicated by an arrow with a dotted line in  FIG. 10 . This is the case where the operator rotates the opening/closing lever  54  in the clockwise direction as viewed from the operator. 
         [0092]      FIG. 11  illustrates a state of the opening/closing lever  54  after having been rotated. 
         [0093]    By the rotation, the opening/closing lever  54  moves downward the rotating shaft  51  connected thereto, and moves upward the rotating shaft  52  connected thereto. As a result, the rotating shaft  51  is disengaged from the bearing section  6  in the rack body  2 . The rotating shaft  52  is also disengaged from the bearing section  6  in the rack body  2 . In this state, the opening/closing lever  54  becomes locked. As a result, the rotating shafts  51  and  52  also become locked. By the rotation, the opening/closing lever  54  depresses the lock bar  71  connected to the rotating shaft  51 . Consequently, within a hole section  72  of the lock bar  71 , a protrusion section  73  of the rotating shaft  51  slides from the right end of the hole section  72  toward the left side, and stops at the left end thereof. 
         [0094]    In this state, the lock bar  71  is inhibited by the protrusion section  73 , and cannot slide toward the right direction, so that the rotating shaft  61  connected to the lock bar  71 , and the opening/closing lever  64  connected to the rotating shaft  61  are inhibited from clockwise rotation. 
         [0095]    As a consequence, the rotating shafts  61  and  62  serve as a shaft for rotating the door  4  from the left side as viewed from the operator. When the operator pulls forward the opening/closing lever  54 , the door body  7  opens from the left side. 
         [0096]    Next, description is made of operations when the door  4  that has been opened from the left side is to be closed. 
         [0097]    First, the operator rotates the door  4  and accommodates it within the rack body  2 . Then, the operator rotates the opening/closing lever  54  in the counterclockwise direction as viewed from the operator. In  FIG. 11 , since the opening/closing lever  54  rotates clockwise, it moves upward the rotating shaft  51  connected thereto, and moves downward the rotating shaft  52  connected thereto. As a result, the rotating shaft  51  is inserted into the bearing section  6  in the rack body  2 . The rotating shaft  52  is also inserted into the bearing section  6  in the rack body  2 . 
         [0098]    Simultaneously, the opening/closing lever  54  pushes up the lock bar  71 . Consequently, the protrusion section  73  of the rotating shaft  51  slides within the hole section  72  up to the right end thereof. The lock bar  71  returns to the stoppage position. This results in a state where the door body  7  is closed. 
         [0099]      FIG. 12  is a diagram of operations when the door according to the second embodiment is to be opened from the right side as viewed from the operator. 
         [0100]    First, in the state shown in  FIG. 10 , the opening/closing lever  64  is rotated in the clockwise direction, as indicated by a dotted line with an arrow in  FIG. 10 . This is the case where the operator rotates the opening/closing lever  64  in the counterclockwise direction as viewed from the operator. 
         [0101]    By this rotation, the opening/closing lever  64  moves downward the rotating shaft  61  connected thereto, and moves upward the rotating shaft  62  connected thereto. As a result, the rotating shaft  61  is disengaged from the bearing section  6  in the rack body  2 . The rotating shaft  62  is also disengaged from the bearing section  6  in the rack body  2 . 
         [0102]    Simultaneously, the opening/closing lever  64  depresses the lock bar  71 . As a consequence, the protrusion section  73  of the rotating shaft  51  slides within the hole section  72  of the lock bar  71 , and stops at the left end of the hole section  72 . 
         [0103]    In this state, even when attempting to rotate the opening/closing lever  54  connected to the lock bar  71 , the rotating shaft  61  cannot move any more, to thereby inhibit the movement of the lock bar  71 , so that the opening/closing lever  54  cannot rotate. 
         [0104]    The rotating shafts  51  and  52  serve as a shaft for opening the door body  7  from the right side as viewed from the operator. When the operator pulls forward the opening/closing lever  64 , the door  4  opens from the right side. 
         [0105]    Now, description is made of operations when the door  4  that has been opened from the right side is to be closed. 
         [0106]    First, the operator rotates the door  4  and accommodates it within the rack body  2 . Then, the operator rotates the opening/closing lever  64  in the clockwise direction as viewed from the operator. By this rotation, the opening/closing lever  64  moves upward the rotating shaft  61  connected thereto, and moves downward the rotating shaft  62  connected thereto. As a result, the rotating shaft  61  is inserted into the bearing section  6  in the rack body  2 . The rotating shaft  62  is also inserted into the bearing section  6  in the rack body  2 . 
         [0107]    Simultaneously, the opening/closing lever  64  pushes up the lock bar  71 . As a result, in the lock bar  71 , the protrusion section  73  thereof slides within the hole section  72  from the left end to the right end thereof. Consequently, the lock bar  71  returns to the stoppage position. This results in a state where the door  4  is closed. 
         [0108]    As shown in the above-described embodiments, since a device having a rack with a door structure for opening from both of the left and right sides is less in limitations in installing the device, maintenance performance and work efficiency thereof can be enhanced. 
         [0109]    The foregoing descriptions have been made of a rack and its door used for a disk array device, but besides, the present invention is also applicable to a rack and its door for other information processing devices such as a server.