Abstract:
A computer system includes a chassis, a bracket and a tray. The chassis includes a bottom plate and two parallel side plates perpendicular to the bottom plate. A side plate post is located on each of the side plates. The bracket is located on the bottom plate between the side plates. A bracket post is located on the bracket. The tray defines two tray positioning openings therein. The tray positioning openings receive the bracket post and side plate post so as to secure the tray in the chassis between the bracket and the one of the side plates.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to computer systems, and particularly to a computer system for securing circuit boards therein. 
         [0003]    2. Description of Related Art 
         [0004]    A conventional computer enclosure includes a chassis capable of securing a motherboard therein. Usually, the chassis can only accommodate a motherboard of a predetermined size or sizes. So, another chassis must be used if a motherboard of different size is desired. 
     
    
     
       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 exploded, isometric view of an embodiment of a computer system. 
           [0007]      FIG. 2  is an assembled view of a chassis, a bracket and two of the circuit boards of  FIG. 1 . 
           [0008]      FIG. 3  is an assembled view of  FIG. 1 . 
           [0009]      FIG. 4  is an assembled view of an alternative embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    Referring to  FIGS. 1-2 , an embodiment of a computer system includes a chassis  10 , a bracket  30 , and two trays  50 . 
         [0011]    The chassis  10  includes a bottom plate  11  and two parallel side plates  12  perpendicularly bent up from opposite edges of the bottom plate  11 . A plurality of mounting holes  112  and securing holes  114  are defined in the bottom plate  11 . A plurality of posts  122  is disposed on an inner surface of each side plate  12 . Each side plate post  122  includes a head portion  124  at a free end, and a neck portion  126  with a diameter smaller than that of the head portion  124 . A plurality of slits  116  is defined in the bottom plate  11 . 
         [0012]    The bracket  30  includes a top wall  33  and two parallel side walls  31  bent perpendicularly down from two opposite edges of the top wall  33 . A plurality of posts  311  is located on an outer surface of each side wall  31 . Each bracket post  311  includes a head  3113 , and a neck  3115  with a diameter smaller than that of the head  3113 . A support flange  313  is perpendicularly bent out from a bottom edge of each side wall  31 . A plurality of securing holes  3131  is defined in each support flange  313 , corresponding to the securing holes  114  of the bottom plate  11  of the chassis  1 O. A plurality of tabs  315  extends from a bottom edge of each side wall  31  configured for engaging in the slits  116  of the bottom plate  11  of the chassis  1 O. A bent flange  317  is perpendicularly bent out from a front edge of each side wall  31 . 
         [0013]    Each of the trays  50  includes a bottom wall  41 , and two side walls  53  extending perpendicularly upward from opposite edges of the bottom wall  41 . A plurality of positioning openings  531  is defined in the side walls  53 , corresponding to the posts  122 ,  311  of the chassis  10  and the bracket  31 . Each positioning opening  531  includes an entry  5311  with a width greater than the diameter of the head portion  124  of each side plate post  122  and the head  3113  of each bracket post  311 , and a locking hole  5313  with a width smaller than the width of the entry  5311 , but larger than the neck portion  126  and the neck  3115 . 
         [0014]    Referring also to  FIGS. 2-3 , in assembly, the bracket  30  is placed in a middle portion of the bottom plate  11  of the chassis  10 , and spaced from the side plates  12 . The tabs  315  of the side walls  31  of the bracket  30  respectively engage in the slits  116  of the bottom plate  11  of the chassis  10  to prevent the bracket  30  moving along directions parallel to the bottom plate  11  of the chassis  10 . The support flange securing holes  3131  align with the bottom plate securing holes  114 . A plurality of fasteners  100 , such as screws, engages in the support flange securing holes  3131  and the bottom plate securing holes  114  to fix the bracket  30  on the bottom plate  11  of the chassis  10 . Then two circuit boards  81 ,  82  can be placed on the bottom plate  11  between the side walls  31  of the bracket  30  and the side plates  12  of the chassis  10 . A plurality of circuit board mounting holes (not labeled) align with the bottom plate mounting holes  112  of the bottom plate  11 , and a plurality of fasteners (not shown), such as screws, are respectively engaged into the bottom plate mounting hole  112  and the circuit board mounting holes so as to fix the two circuit boards  81 ,  82  in the chassis  10 . 
         [0015]    The two trays  50  are respectively placed between the side plates  11  of the chassis  10  and adjacent side walls  311  of the bracket  30 . The head portions  124  of each side plate posts  122  and the head  3113  of the bracket posts  311  extend through the corresponding positioning openings  531  of the side walls  53  of the tray  50  via the corresponding entries  5311 . The tray  50  is then pushed to slide the side plate post neck portions  126  and the bracket post neck  3115  into the positioning openings  531 , until the side plate posts  122  and the bracket posts  311  are positioned in the locking holes  5313  of the positioning openings  531 . The trays  50  are thereby secured between the bracket  30  and the side plates  12  of the chassis  10 . Another two circuit boards  83 ,  84  having the same structures as the two circuit boards  81 ,  82  can be then secured on the bottom walls  51  of the trays  50 . 
         [0016]    Referring also to  FIG. 4 , two circuit boards  91 ,  92  are wider than the circuit board  80 . A tray  70  is provided with a similar structure as the tray  50 . The tray  70  includes a bottom wall  71  wider than the bottom wall  51  of the tray  50  and two parallel side walls  73  bent from opposite edges of the bottom wall  51 . The bottom wall  71  is capable of receiving the circuit board  92 . A plurality of positioning openings  731  is defined in each side wall  71 . The positioning openings  731  have a same structure as the positioning openings of the tray  50 , and also include an entry and a locking hole. 
         [0017]    The assembly of the bracket  30 , the circuit boards  91 ,  92  and the tray  70  is similar to the installing process as described above. After being assembled, the bracket  30  is placed in the chassis  10  and secured on the bottom plate  11  and the side plate  12 . The bracket post heads  3113  and the side plate post head portions  124  are inserted through the corresponding positioning openings  731  via the entry thereof, and the bracket post necks  3115  and the side plate post neck portions  126  are positioned in the locking holes of the positioning openings  731  of the side walls  73  of the tray  70 , so that the tray  70  is secured in the chassis  10 . The circuit boards  91 ,  92  can be secured on the tray  70 , and on the bottom plate  11  between the bracket  530  and another side plate  12  of the chassis  10 . The tray  70  is secured in the chassis  10  between the bracket  30  and the another side plate  12 . 
         [0018]    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.