Abstract:
A fastening device includes a head and a shank. The shank has opposite ends, one end of the shank is connected to the head, and the other end of the shank defines an operating part. The operating part is capable of cooperating with a disassembling tool to enable the fastening device to rotate with respect to the longitudinal axis of the shank.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to fastening devices, and particularly to a housing and an electronic device using a fastening device. 
         [0003]    2. Description of Related Art 
         [0004]    Electronic devices use fasteners such as screws to fasten electronic components on circuit boards or the housing of the electronic device. However, the screw heads are unsightly and take away from the aesthetic of the electronic device. Further, if the screw heads are not tightly or properly fixed to the body they can snag on items of clothing and may come loose. 
         [0005]    Therefore, there is room for improvement within the art. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    Many aspects of the embodiments can be better understood with reference 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 present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0007]      FIG. 1  is an isometric view of an electronic device having a housing. 
           [0008]      FIG. 2  is an isometric view of the housing in  FIG. 1 , but viewed from an opposite aspect, the housing has a fastening device. 
           [0009]      FIG. 3  is an explored view of the housing in  FIG. 2 . 
           [0010]      FIG. 4  is an isometric view of the fastening device in  FIG. 2 . 
           [0011]      FIG. 5-7  show states of assembling the housing in  FIG. 2 . 
           [0012]      FIG. 8  is a cross-sectional view of the housing in  FIG. 1  taken along VIII-VIII. 
       
    
    
     DETAILED DESCRIPTION 
       [0013]      FIGS. 1-2  show an electronic device  100  in accordance with an embodiment. For example, the electronic device  100  may be a mobile phone, a media player, a notebook compurter and so on. The electronic device  100  includes a housing  50  for receiving electronic components (not shown), such as circuit boards, batteries, wires, and so on. The electronic components may create electronic circuits with particular functions of the electroinc device  100 . The housing  50  includes a first housing  10 , a second housing  20 , and a plurality of fastening devices  30  for fastening the first housing  10  and the second housing  20  together. A disassembling tool  40  is capable of tightening or releasing the fastening device  30  to make the first housing  10  fix to or detach from the second housing  20 . 
         [0014]    Refering to  FIG. 3 , the first housing  10  includes a bottom (not shown), a sidewall  11  protruding from the bottom, and a rectangular opening  12  defined by the sidewall  11  and the bottom. The sidewall  11  defines a plurality of first through holes  110  at interval. For example, the number of the first through holes  110  is two. The first through holes  110  are threaded through holes. Each first through hole  110  has a small diameter, such as 0.9 mm˜1.3 mm. 
         [0015]    The second housing  20  covers on the first housing  10  for receiving the electronic components. The second housing  20  is a rectangular board. A plurality of fixing members  21  protrude from a surface of the second housing  20  which faces the first housing  10 . The fixing members  21  are adjacent to the edge of the second housing  20 . For example, the number of the fixing member  21  is two. Each fixing member  21  is a rectangular block and defines a second through hole  210 . The second through hole  210  is a stepped hole, and includes a larger hole  211  and a small hole  213  communicating with the larger hole  211 . The small hole  213  is adjacent to the edge of the second housing  20 , and the larger hole  211  is away from the edge of the second housing  20 . The small hole  213  is a threaded hole, the diameter of the small hole  213  is the same as the diameter of the first through hole  110 , but smaller than the diameter of the larger hole  211 . When the second housing  20  covers the first housing  10 , the second housing  20  seals the opening  12 , the fixing members  21  locate inside of the first housing  10  and attach to the sidewall  11 , and central axes of the second through hole  210  and the first through hole  110  are arranged in a straight line (see  FIG. 8 ). 
         [0016]    In the exemplary embodiment, the number of the fastening devices  30  is two. Each fastening device  30  is inserted into one second through hole  210  and one first through hole  110  in order, and engaged in the first housing  10  and the second housing  20 . As a result, the first housing  10  and the second housing  20  are fixed together. Each fastening device  30  includes a head  31 , a shank  32  connected to the head  31 , and a screw thread  33  wrapped around the shank  32  ( FIG. 4 ). The length of screw thread  32  taken along the longitudinal axis L of the shank  32  is the same as or shorter than the sum of the length of the first through hole  110  and the small hole  213 . The head  31  is disc-shaped. The shank  32  is columnar. The cross-section of the head  31  is bigger than the cross-section of the shank  32 . One end of the shank  32  is connected to the head  31 . An operating part  34  is placed on the other end of the shank  32  which matches the disassembling tool  40 . The operating part  34  may be a polygon blind hole running along the longitudinal axis L of the shank  32 , for example a hexagon socket (see  FIG. 4 ). Accordingly, the disassembling tool  40  may be a screwdriver with polygon bit. It is understood that, the operating part  34  can also be a slot screw socket or a cross-recess socket (not shown). Accordingly, the disassembling tool  40  may be a screwdriver a flat blade or cross blade. 
         [0017]      FIGS. 5-7  show how to assemble the first housing  10  and the second housing  20  together by the fastening device  30 . Firstly, the fastening devices  30  are approximately screwed into the second through holes  210 . For example, the shanks  32  are inserted into larger holes  211 , and then screwed in the small holes  213 . Secondly, the second housing  20  covers the first housing  10 . At this time, the second housing  20  seals the opening  12 , the fixing members  21  locate inside of the first housing  10  and attach to the sidewall  11 , the small holes  213  are corresponding to the first through holes  110 . Thirdly, the disassembling tool  40  is inserted into one of the first through holes  110 , and then further inserted into the corresponding operating part  34 . Lastly, the disassembling tool  40  is turned to tigten the fastening device  30  until the screw thread  33  is completely screwed into small hole  213  and the first through hole  110 , and the head  31  is placed in the larger hole  211  (see  FIG. 8 ). When all the fastening devices  30  are tigtened, the first housing  10  and the second housing  20  have been assembled. 
         [0018]    As described above, the first through holes  110  are very small, the users who use the electronic device  100  cannot discover the fastening device  30  through the first through holes  110 . Therefore, the users cannot disassemble the first housing  10  and the second housing  20  to unfasten the electronic components inside. So the risk of damaging the electronic device  100  is reduced. 
         [0019]    Even though relevant information and the advantages of the present embodiments have been set forth in the foregoing description, together with details of the functions of the present embodiments, the disclosure is illustrative only; and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.