You are an expert at summarizing long articles. Proceed to summarize the following text:

You are an expert at summarizing long articles. Proceed to summarize the following text: 
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to a server rack. 
         [0003]    2. Description of Related Art 
         [0004]    A server rack houses electronic equipment, such as data storage devices, and power supplies. The server rack includes a frame and a plurality of side plates installed in the frame. The electronic equipment is generally sensitive and important. Therefore, the security of the server rack is equally as important. Generally, each side plate is equipped with a lock to prevent it from being stolen. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    Many aspects of the embodiments can be better understood with references to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0006]      FIG. 1  is an isometric view of a server rack in accordance with an embodiment. 
           [0007]      FIG. 2  is an exploded, isometric view of  FIG. 1 . 
           [0008]      FIG. 3  is an isometric, partial view of  FIG. 2 . 
           [0009]      FIG. 4  is an exploded, isometric view of two side plates and a maintaining member. 
           [0010]      FIG. 5  is an enlarged view of an encircled portion V of  FIG. 4 . 
           [0011]      FIG. 6  is an exploded, isometric view of a locking member of the server rack. 
           [0012]      FIG. 7  is an isometric view of a latching member of the server rack. 
           [0013]      FIG. 8  is an enlarged view of an encircled portion IIX of  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION 
       [0014]    The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one. 
         [0015]    Referring to  FIG. 1  and  FIG. 2 , a server rack in accordance with an embodiment includes a shell  10  and a plurality of side plates  30 . 
         [0016]    The shell  10  includes a top frame  11 , a bottom frame  13 , two first supports  15  and two second supports  18 . The two first supports  15  and the second supports  18  are located between the top frame  11  and the bottom frame  13 . A mounting member  51  is secured to the first support  15 . Referring to  FIG. 3 , each mounting member  51  includes a first mounting portion  511  and a first latching portion  512  located on the first mounting portion  511 . The first mounting portion  511  is secured to the first support  15 . A plurality of positioning posts (not shown) is located on the second support  18 . 
         [0017]    A plurality of maintaining members  19  is located between one of the first supports  15  and one of the second supports  18  (only two maintaining members shown in the  FIG. 1 ). Each maintaining member  19  includes a maintaining wall  190  and two maintaining pieces  191 . The maintaining pieces  191  extend from two opposite edges of the maintaining wall  190 . Each maintaining piece  191  defines a notch  193 . 
         [0018]    Referring to  FIG. 4  to  FIG. 6 , a locking member  60  can be secured to the maintaining member  19  between the two notches  193 . Each locking member  60  includes a locking tongue  61  and a latch  63 . The latch  63  includes a mounting portion  631  and a connecting portion  633  for securing the mounting portion  631  to the maintaining member  19 . The diameter of the mounting portion  631  is smaller than that of the connecting portion  633 . The outer surface of the mounting portion  631  defines screw thread and a locking hole  6311 . The mounting portion  631  is located in the maintaining wall  190  and the connecting portion  633  is located on the outer surface of the maintaining wall  190 . A rotating portion  635  is rotatably installed to the connecting portion  633 . An installing member  68 , such as a nut, is secured to the mounting portion  631  to secure the latch  63  to the maintaining member  19 . 
         [0019]    The locking tongue  61  includes a main body  611  and two positioning pieces  613 . The two positioning pieces  613  extend from two opposite edges of the main body  611  along two opposite directions. The main body  611  defines a positioning hole  6111 . A positioning member  62 , configured for securing the locking tongue  61 , includes a first positioning portion  621  and a second positioning portion  623  located on the first positioning portion  621 . In one embodiment, the diameter of the first positioning portion  621  is greater than that of the second positioning portion  623  and the width of the positioning hole  6111 , and the diameter of the second positioning portion  623  is smaller than the width of the positioning hole  6111 . A hoop  67  includes a limiting block (not shown) configured for being engaged in the positioning hole  6111 . The hoop  67  defines a through hole  673  for receiving the second positioning portion  623  of the positioning member  62 . 
         [0020]    In assembly of the locking member  60 , the mounting portion  631  of the latch  63  is engaged with the maintaining member  19 , and the connecting portion  633  is located outside the maintaining wall  190 . The hoop  67  is mounted to the latch  63 . The limiting block is engaged in the positioning hole  6111 , and the second positioning portion  623  is inserted in the through hole  673  to engage with the rotating portion  635 . The locking tongue  61  is thereby secured to the latch  63 . The locking tongue  61  can be rotate when the rotating portion  635  is rotated using tools, such as a key  65 . The locking tongue  61  can be rotated between a first location and a second location. The two positioning pieces  613  of the locking tongue  61  are disengaged from the two notches  193  when the locking tongue  61  is in the first location; the two positioning pieces  613  are engaged in the two notches  193  when the locking tongue  61  is in the second location. 
         [0021]    Each side plate  30  includes a plate body  31 , a first flange  33 , a second flange  37 , a third flange  38  and a fourth flange  39  that extend respectively from a top edge, a bottom edge, a left edge and a right edge of the plate body  31 . A knob  313  is located in the plate body  31  near the fourth flange  39 . An installing wall  311  is located in the plate body  31  near the third flange  38 . The installing wall  311  defines a mounting hole  3113 . The first flange  33  and the second flange  37  respectively define a first limiting hole  331  and a second limiting hole  371 , for receiving the locking tongue  61 . A mounting notch  381  is defined in the third flange  38  near the mounting hole  3113 . A plurality of positioning holes  391 , configured for receiving the positioning post of the second support  18 , are defined in the fourth flange  39 . 
         [0022]    Referring to  FIG. 7  and  FIG. 8 , a latching member  52 , configured for being engaged in the mounting hole  3113 , includes a body  521  and a limiting portion  527  located on the body  521 . A second latching portion  523  is located in a first section of the body  521 , and a resilient portion  525  is located in a second section of the body  521  opposite to the first section. In one embodiment, the resilient portion  525  extends from the body  521 , and the second latching portion  523  includes a bevel surface. A first opening  526  is defined between the body  521  and the limiting portion  527 , and a second opening  528  is defined between the body  521  and the resilient portion  525 . The first opening  526  is adjacent to the second latching portion  523 , and the second opening  528  is adjacent to the resilient portion  525 . A groove  5271  is defined in the limiting portion  527  and extends to the body  521 . In assembly of the latching member  52 , the body  521  is engaged in the mounting hole  3113  of the side plate  30 . A first edge of the mounting hole  3113  is engaged in the first opening  526 . The resilient portion  525  abuts a second edge of the mounting hole  3113  opposite to the first edge. Thus, the latching member  52  is secured to the side plate  30  and can be slid relative to the side plate  30 . 
         [0023]    The latching member  52  is capable of sliding between a locked location and an unlocked location. In the locked location, the resilient portion  525  is elastically deformed at a minimum, and the second latching portion  523  is located out side the mounting notch  381 . In the unlocked location, the resilient portion  525  is elastically deformed at maximum, and the second latching portion  523  is located inside the mounting notch  381  in the side plate  30 . 
         [0024]    In assembly of the side plate  30 , the locking tongue  61  is located in the first location and the latching member  52  is located in the locked location. The fourth flange  39  of the side plate  30  abuts the second support  18  and the positioning post of the second support  18  is engaged in the positioning hole  391 . The side plate  30  is rotated towards the first support  15 , until the first latching portion  512  blocks the second latching portion  523 . The first latching portion  512  slides the second latching portion  523  from the locked location to the unlocked location. The second latching portion  523  passes across the first latching portion  512 . The third flange  38  abuts the first support  15 . The second through hole  371  is aligned with the notch  193 . The resilient portion  525  rebounds to slide the latching member  52  from the unlocked location to the locked location. The second latching portion  523  is engaged with the first latching portion  512 . Thus, the side plate  30  is secured to the shell  10 . 
         [0025]    The rotating portion  635  of the latch  63  is rotated by the key  65 , the locking tongue  61  is rotated from the first location to the second location. The positioning piece  613  is engaged in the second through hole  371  via the notch  193 . The side plate  30  is thereby secured to the shell  10 . 
         [0026]    In disassembly of the side plate  30 , the rotating portion  635  of the latch  63  is rotated by the key  65 , the locking tongue  61  is rotated from the second location to the first location. The positioning piece  613  is disengaged from the second through hole  371 . The latching member  52  is slid from the locked location to unlocked location. The second latching portion  523  is disengaged from the first latching portion  512 . Thus, the side plate  30  can be removed from the shell  10 . 
         [0027]    It is to be understood, however, that even though numerous characteristics and advantages have been set forth in the foregoing description of embodiments, together with details of the structures and functions of the embodiments, the disclosure is illustrative only and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Summary:
A server rack comprises two side plates, a shell and a locking member. The two side plates respectively define a through hole; the shell secures the side plate, which includes a maintaining member located between the two side plates; the locking member secured to the maintaining member including a locking tongue. The locking tongue includes a body and two positioning pieces extended from two opposite direction of the body. The two positioning pieces are configured for engaging in the through hole of the two side plates, and are rotatable between a first position, where the two positioning pieces is disengaged from the through holes of the side plates, and a second position, where the two positioning pieces is engaged in the through holes.