Abstract:
An electronic device enclosure comprising a chassis, the chassis comprises a chassis bottom wall and a chassis rear wall connected to the chassis bottom wall. The chassis bottom wall is capable of mounting a motherboard with a module. An elastic flange is located on the chassis rear wall. The elastic flange is engaged with the module of the motherboard, and the motherboard is located between the flange and the motherboard. The invention further offers an electronic device.

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to an electronic device enclosure with a motherboard. 
     2. Description of Related Art 
     A computer chassis comprises a chassis rear wall, and a motherboard is secured in the computer chassis. USB (Universal Serial Bus) modules, audio modules, a network module and peripheral component interconnecting modules are mounted on the motherboard. USB interfaces, audio interfaces, a network interface and peripheral component interconnecting interfaces are defined on the chassis rear wall. However, parts of the motherboard can be displaced if the computer is struck, causing modules of the motherboard move out of alignment with the corresponding interfaces and even become disengaged from the interfaces. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       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. 
         FIG. 1  is an exploded, isometric view of an electronic device enclosure in accordance with an embodiment. 
         FIG. 2  is an assembled view of the electronic device enclosure of  FIG. 1 . 
         FIG. 3  is a graph showing an acceleration curve of an impact applied on an embodiment of the electronic device enclosure. 
         FIG. 4  is a graph illustrating displacement of a part of a motherboard secured in a conventional electronic device enclosure of a prior art embodiment enduring the impact of  FIG. 3 . 
         FIG. 5  is a graph illustrating of a part of the motherboard of the embodiment of  FIG. 2  enduring the impact of  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION 
     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. 
     Referring to  FIG. 1 , an electronic device enclosure in accordance with an embodiment includes a chassis  10 . The chassis  10  can have any geometric shape, configuration, or orientation suitable for housing an electronic device therein. For simplicity and as an aid to the description, the chassis  10  is depicted as a cuboid (i.e., a partially or completely enclosed rectangular box) will be described herein, although other equally effective geometric shapes and configurations may exist in other embodiments. The chassis  10  includes a chassis bottom wall  11  and a chassis rear wall  13  connected to the chassis bottom wall  11 . In one exemplary embodiment, the chassis rear wall  13  is substantially perpendicular to the chassis bottom wall  11 . 
     A motherboard  30  is mounted on the chassis bottom wall  11 . A first module  31 , a second module  33 , and a third module  35  are disposed on one side of the motherboard  30 . In an exemplary embodiment, the first module  31  and the second module  33  are USB modules, the third module  35  is a network module used to connect a network card (not shown). 
     The chassis rear wall  13  defines a first opening  131 , a second opening  132 , and a third opening  133 . The first, second, and third openings  131 ,  132 ,  133  are capable of engaging with the first, second, and third modules  31 ,  33 ,  35  on the motherboard  30 , respectively. In an exemplary embodiment, the first, second and third openings  131 ,  132 ,  133  are rectangular. A first flange  1311 , a second flange  1321 , and a third flange  1331  are located on the chassis rear wall  13  and capable of abutting the first, second, and third modules  31 ,  33 ,  35 , respectively. The first flange  1311  extends from an edge of the first opening  131 , the second flange  1321  extends from an edge of the second opening  132 , and the third flange  1331  extends from an edge of the third opening  133 . In one exemplary embodiment, the first, second and third flanges  1311 ,  1321 ,  1331  are elastic. The width of the first flange  1311  is approximately the same as the width of the first module  31 , the width of the second flange  1321  is approximately the same as the width of the second module  33 , and the width of the third flange  1331  is approximately the same as the width of the third module  35 . In an exemplary embodiment, the first flange  1311 , the second flange  1321 , and the third flange  1331  are arcuate. 
     In assembly, the motherboard  20  is mounted on the chassis bottom wall  11  by fasteners, such as screws, studs and so on, partially or completely inserted into complimentary threaded receivers (not labeled) defined in the chassis bottom wall  11  of the chassis  10 . The first flange  1311  abuts the first module  31 , the second flange  1321  abuts the second module  33 , and the third flange  1331  abuts the third module  35 . The first, second and third modules  31 ,  33 ,  35  correspond to the first, second, and third openings  131 ,  132 ,  133 , respectively. 
     In use, when the chassis  10  suffers an impact, a first principal stress may be applied on the motherboard  30 , however the first, second and third flanges  1311 ,  1321 ,  1331  respectively engaged with the first, second and third modules  31 ,  33 ,  35  will help prevent the motherboard  30  from being resiliently deformed relative to the chassis bottom wall  11 , maintaining alignment between the first, second and third modules  31 ,  33 ,  35  and the first, second, and third openings  131 ,  132 ,  133 . 
     Referring to  FIGS. 3 to 5 , a software LS-DYNA is used for simulating the first principal stress applied on the motherboard  30  when the chassis  10  suffers an impact. Generally, when the chassis  10  suffers an impact, the first, second and third modules  31 ,  33 ,  35  on the motherboard  30  correspondingly suffer a great stress. An acceleration curve (shown in  FIG. 3 ) is used for simulating the impact on the chassis  10 . 
       FIG. 4  shows the first principal stress distribution of a motherboard fixed in a conventional electronic device enclosure. When a chassis of the conventional electronic device enclosure suffers an impact, the tensile stress applied on a motherboard is great. The motherboard is attached on a bottom wall of the conventional chassis, and a part of the motherboard, where some modules are positioned, resiliently deforms relative to the bottom wall a distance (shown in  FIG. 4 ) under the external force shown in  FIG. 3 . This will cause the modules on the motherboard to move out of alignment with the openings in a rear wall of the conventional chassis. Referring to  FIG. 4 , the distance the motherboard resiliently deforms in one direction is often greater than one millimeter, and as much as 2.6 millimeters, and as much as minus 1.2 millimeters (not labeled) in the opposite direction. The distances are great enough to disengage modules on the motherboard attached to the openings in the rear wall. 
       FIG. 5  shows the first principal stress distribution of the chassis  10  in accordance with one embodiment of  FIGS. 1-2 , which has the first, second and third flanges  1311 ,  1321 ,  1331 . When the chassis  10  suffers an impact, the tensile stress is applied on the motherboard  30  in one direction but an opposing force is applied due to the resilience of the first, second and third flanges  1311 ,  1321 ,  1331 . With the first, second and third flanges  1311 ,  1321 ,  1331 , the motherboard  30  only resiliently deforms relative to the chassis bottom wall  11  a distance shown in  FIG. 5  under the external force shown in  FIG. 3 . 
     Referring to  FIG. 5 , the distance the motherboard  30  resiliently deforms is often less than 1.0 millimeter, and at most 1.1 millimeters, and the most in the other direction is minus 0.4 millimeters. Therefore, misalignment of the module is minimized and engagement with openings of the rear wall  14  maintained. 
     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.