Abstract:
A fastening mechanism for fixing a radiator having a plurality of heat sinks to a circuit board includes two fixing rods fixed on the circuit board, a connecting member positioned between the heat sinks; and two fastening arms respectively connecting the connecting member to the fixing rods. An electronic device using the fastening mechanism is also provided.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure generally relates to fastening mechanisms, and particularly to a fastening mechanism for fixing a radiator. 
         [0003]    2. Description of the Related Art 
         [0004]    Electrical components, such as a CPU of a computer, generate a great deal of heat. Excessive heat can affect the performance of the CPU or damage the CPU. A radiator is usually fixed on the CPU via a fastening mechanism to cool the CPU. However, the current fastening mechanism has a complex structure and is difficult to operate. 
         [0005]    Therefore, there is room for improvement within the art. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0006]    The components in the drawings are not necessarily drawn to scale, the emphasis instead placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0007]      FIG. 1  is an exploded, isometric view of an embodiment of an electronic device including a circuit board, a chip, a radiator, and a fastening mechanism. 
           [0008]      FIG. 2  is a side view of the radiator of  FIG. 1 . 
           [0009]      FIG. 3  is an assembled, isometric view of the electronic device of  FIG. 1 . 
           [0010]      FIG. 4  is similar to  FIG. 3 , with the radiator fixed to the circuit board by the fastening mechanism. 
           [0011]      FIG. 5  is a side view of the electronic device of  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION 
       [0012]    Referring to  FIG. 1 , an embodiment of an electronic device  1  includes a circuit board  10 , a chip  20  positioned on the circuit board  10 , a radiator  30  for cooling the chip  20 , and a fastening mechanism  40  fixing the radiator  30  to the circuit board  10 . The circuit board  10  includes a chip base  11  for positioning the chip  20 . In the illustrated embodiment, the circuit board  10  is a motherboard, and the chip  20  is a CPU. 
         [0013]    Referring to  FIG. 2 , the radiator  30  includes a conducting base  31  and a plurality of heat sinks  32  formed on the conducting base  31 . The conducting base  31  includes a top surface  310  and a bottom surface  311  opposite to the top surface  310 . The conducting base  31  is positioned on the chip  20 , with the bottom surface  311  facing the chip  20 . The heat sinks  32  are formed on the top surface  310 . The top surface  310  further forms a plurality of positioning members  3101  arranged between the heat sinks  32  and in two parallel rows. In the illustrated embodiment, the chip  20  and the conducting base  31  are rectangular-shaped, and the heat sinks  32  are arranged in a matrix. 
         [0014]    The fastening mechanism  40  includes two fixing rods  41  positioned near opposite sides of the conducting base  31 , and a fastening assembly  42  positioned between the heat sinks  32 . Each fixing rod  41  includes a main body  410 , a fixing end  411 , and a restricting end  412 . The fixing end  411  and the restricting end  412  are positioned on opposite ends of the main body  410 . The fixing end  411  is fixed to the circuit board  10 . 
         [0015]    The fastening assembly  42  includes a connecting member  421  and two fastening arms  422  connected to the connecting member  421 . The connecting member  421  includes two positioning arms  4211  substantially parallel to each other, and two connecting poles  4212  connecting the positioning arms  4211 . Each positioning arm  4211  is substantially U-shaped, and includes a first section  4211   a  and two second sections  4211   b  extending substantially perpendicularly from opposite ends of the first section  4211   a.  A length of the second sections  4211   b  is larger than a height of the heat sinks  32  relative to the circuit board  10 . Each connecting pole  4212  is connected to the second sections  4211   b  of the positioning arms  4211 , and is substantially perpendicular to the positioning arm  4211 . Two arc-shaped receiving portions  4212   a  are formed on each positioning arm  4211 . In an alternative embodiment, the positioning arm  4211  may have three or more receiving portions  4212   a.    
         [0016]    Each fastening arm  422  is substantially U-shaped, and forms a connecting portion  4221  at a first end, and two hook portions  4222  at a second end opposite to the first end. In the illustrated embodiment, the connecting portion  4221  is arc-shaped, and restricting end  412  is hemispherical. A radius of the connecting portion  4221  is less than that of the restricting end  412  and greater than a radius of the main body  410 , so that the connecting portion  4221  can sleeve on the main body  410  and resist the restricting end  412 . The hook portions  4222  engage with the receiving portions  4212   a  of the connecting member  421 , thereby rotatably connecting the fastening arm  422  to the connecting member  421 . In alternative embodiments, the hook portions  4222  can be fixed to the receiving portions  4212   a,  and the fastening arm  422  and the connecting member  421  can be integrally formed. 
         [0017]    Referring to  FIG. 3 through 5 , in assembling the radiator  30  to the circuit board  10 , the first sections  4211   a  of the connecting member  421  engage with the positioning members  3101 , thereby fixing the connecting member  421  on the radiator  30 . The hook portions  4222  of the fastening arms  422  engage with the receiving portions  4212   a  of the connecting member  421 . The radiator  30  is positioned on the chip  20 , and then the fastening arms  422  are pushed downwards to make the connecting portion  4221  sleeve on the fixing rods  41 . After that, the radiator  30  is fixed to the circuit board  10 . Therefore, the fastening mechanism  40  has a simple structure, and is easily operated. 
         [0018]    While the present disclosure has been described with reference to particular embodiments, the description is illustrative of the disclosure and is not to be construed as limiting the disclosure. Therefore, various modifications can be made to the embodiments by those of ordinary skill in the art without departing from the true spirit and scope of the disclosure, as defined by the appended claims.