Abstract:
An exemplary clip is adapted for fixing a heat sink to a heat generating component. The clip includes a body, a first engaging member, an operating member and a second engaging member. The body is adapted for pressing the heat sink. The first engaging member is formed at one end of the body. The operating member pivotally connects to another end of the body. The second engaging member pivotally engages with the operating member and is capable of moving towards or away from the body during rotation of the operating member.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to heat dissipation devices and, more particularly, to a heat dissipation device with a clip which assembles the heat dissipation device to an electronic device easily and safely. 
         [0003]    2. Description of Related Art 
         [0004]    Generally, a heat dissipation device is provided to cool an electronic component of an electronic device. The heat dissipation device typically includes a heat sink attached to an outer surface of the electronic component, and a clip fastening the heat sink to the electronic device tightly. 
         [0005]    The clip includes a body spanning over and pressing the heat sink, and two clasps integrally formed at opposite ends of the body. When the heat sink is disposed onto the electronic device, one clasp engages with a hook of the electronic device firstly; then the other clasp is pushed downwardly by a tool until the other clasp is engaged with another hook of the electronic device. Thus, the heat sink is mounted on the electronic device. However, there are usually a plurality of electronic components arranged in the electronic device, and a space between adjacent electronic components is narrow. Therefore, operating the tool is inconvenient. Further, the tool and the clasp of the clip are prone to scrape the surrounding electronic components. 
         [0006]    What is needed, therefore, is a heat dissipation device having a clip to assemble the heat dissipation device to an electronic device easily and safely. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1  is an isometric, assembled view showing a heat dissipation device in accordance with an embodiment of the present disclosure in use. 
           [0008]      FIG. 2  is similar to  FIG. 1 , but shown from another aspect. 
           [0009]      FIG. 3  is an exploded view of  FIG. 1 . 
           [0010]      FIG. 4  is an inverted view of  FIG. 3 . 
           [0011]      FIG. 5  is an enlarged, assembled view of a clip of the heat dissipation device shown in  FIG. 3 . 
           [0012]      FIG. 6  is an exploded view of  FIG. 5 . 
       
    
    
     DETAILED DESCRIPTION 
       [0013]    Referring to  FIGS. 1-3 , a heat dissipation  100  in accordance with an embodiment of the present disclosure is shown. The heat dissipation  100  thermally contacts an electronic component  211  of a printed circuit board (PCB)  200  to dissipate heat of the electronic component  211 . A plurality of through holes (not labeled) are defined in the PCB around the electronic component  211 . 
         [0014]    The heat dissipation device  100  includes a heat sink  10 , a clip  30  and a fan  50 . A chassis  300  is secured on the PCB  200  and encloses the electronic component  211  therein. The heat sink  10  is arranged on the chassis  300  and contacts the electronic component  211 . The clip  30  spans over the heat sink  10  and clasps the chassis  300  to secure the heat sink  10  on the PCB  200 . The fan  50  is mounted on a top end of the heat sink  10 . 
         [0015]    The chassis  300  is generally a rectangular frame. Four legs  301  extend outwardly from four corners of the chassis  300 . Each leg  301  defines a through hole (not labeled) corresponding to one through hole of the PCB  200 . A plurality of clasps  305  are formed on two opposite sides of the chassis  300  for engaging with the clip  30 . Screws  307  extend through the through holes of the legs  301  of the chassis  300  and engage in the through holes of the PCB  200  to secure the chassis  300  on the PCB  200 . 
         [0016]    The heat sink  10  is formed by extrusion of aluminum, and includes a solid, cubical heat absorbing portion  11 , four elongated branches  13  extending outwardly from four upright edges of the heat absorbing portion  11 , and a plurality of fins  15 . The heat absorbing portion  11  thermally contacts the electronic component  211  when the heat sink  10  is mounted on the PCB  200 . A top end of the heat absorbing portion  11  defines two parallel and spaced grooves  113  to receive the clip  30 . A height of each branch  13  is equal to that of the heat absorbing portion  11 . Top ends and bottom ends of the branches  13  are coplanar with a top surface and a bottom surface of the heat absorbing portion  11 , respectively. The outmost end of each branch  13  forms an elongated groove  133  extending along a longitudinal direction. Angles between each two adjoining two branches  13  are equal. The fins  15  extend outwardly from the heat absorbing portion  11  and the branches  13 . The branches  13  divide the fins  15  into four equal parts. The fins  15  of each part are spaced and parallel to each other. The fins  15  of any two opposite parts are parallel to each other. The fins  15  of two adjoining parts are perpendicular to each other. Top portions of some of the fins  15  which are aligned with the grooves  113  of the heat absorbing portion  11  are cut away, to avoid such fins  15  interfering with the clip  30 . 
         [0017]    Referring also to  FIGS. 4-6 , the clip  30  is made of a metallic sheet or a plastic sheet. The clip  30  includes a body  31 , a first engaging member  33 , a second engaging member  35  and an operating member  37 . The first and second engaging members  33 , are located at opposite ends of the body  31 . The operating member  37  pivotally engages with the second engaging member  35  and the body  31 . 
         [0018]    The body  31  has a generally V-shaped configuration, and includes two spaced, parallel, generally V-shaped arms  312 , a first connecting plate  313  and a second connecting plate  314 . The first and second connecting plates  313 ,  314  are rectangular, are located at a top side of the body  31 , and are much shorter than the arms  312 . The first and second connecting plates  313 ,  314  connect opposite ends of the two arms  312 , respectively. Therefore, an opening  311  is defined between middle portions of the arms  312 . A slit  3141  is defined in a central portion of the second connecting plate  314 , for engagingly receiving the second engaging member  35 . A first baffling portion  315  and a second baffling portion  316  extend downwardly from front and rear edges of the second connecting plate  314 . The second engaging member  35  is located between, and perpendicular to, the first baffling portion  315  and the second baffling portion  316 . Two elongated mounting plates  317  extend upwardly from opposite lateral edges of the second connecting plate  314 , respectively, to pivotally engage with the operating member  37 . A central portion of the mounting plate  317  defines a through hole  3171  therein. 
         [0019]    The first engaging member  33  is a rectangular sheet, and extends downwardly from an outer end of the first connecting plate  313 . A top portion of the first engaging member  33  is smaller than a bottom portion of the first engaging member  33 . A hole  331  is defined in the bottom portion of the first engaging member  33 , for engagingly receiving one of the clasps  305  of the chassis  300 . 
         [0020]    The second engaging member  35  includes a top portion  353  and a bottom portion  351 . The bottom portion  351  is elongated and defines a rectangular through hole  3513  therein. A width of the bottom portion  351  is larger than that of the slit  3141  of the second connecting plate  314 . The top portion  353  extends upwardly from a right side of a top end of the bottom portion  351 . The top portion  353  is narrower than the slit  3141  of the second connecting plate  314 . A through hole  3531  is defined at a middle of the top portion  353 . 
         [0021]    The operating member  37  includes a cam-shaped connecting portion  370 , and a handle  374  extending from an end of the connecting portion  370 . A slot  371  extends inwards from the connecting portion  370  to a middle of the handle  374  along a longitudinal direction of the operating member  37 , to receive the top portion  353  of the second engaging member  35  therein. Two shafts  373  extend outwardly from a bottom end of two lateral sides of the connecting portion  370 , corresponding to the through holes  3171  of the mounting plates  317  of the body  31 . Two through holes  375  are defined at a top end of the lateral sides of the connecting portion  370 . 
         [0022]    When the clip  30  is assembled, the connecting portion  370  of the operating member  37  is sandwiched between the mounting plates  317  of the body  31 , with the shafts  373  respectively engaging in the through holes  3171  of the mounting plates  317 . Thus, the operating member  37  is assembled to the body  31 . The shafts  373  are rotatable relative to the mounting plates  317 . The top portion  353  of the second engaging member  35  extends through the slit  3141  of the second connecting plate  314  of the body  31  and the slot  371  of the operating member  37  from bottom to top. A bolt  38  extends through one of the through holes  375 , the through hole  3531  of the top portion  353  of the second engaging member  35 , and the other through hole  375  of the operating member  37  in that order, to assemble the second engaging member  35  to the body  31 . Thus, the clip  30  is assembled completely. The top portion  353  of the second engaging member  35  protrudes up beyond the operating member  37 . A bore diameter of the through hole  3531  is larger than a diameter of the bolt  38 . A width of each of the slot  371  and the slit  3141  is larger than a thickness of the top portion  353  of the second engaging member  35 . Thus, the second engaging member  53  may be slidable along the bolt  38  when the top portion  353  is operated. 
         [0023]    The fan  50  includes a frame  51 , and an impeller  53  received in the frame  51 . An aperture is defined in each corner of the frame  51 , for assembling the fan  50  to the heat sink  10 . When assembled, the fan  50  is arranged on the heat sink  10 , such that the apertures are aligned with the elongated grooves  133  of the heat sink  10 , respectively. Then bolts  55  are extended through the apertures to engage in the elongated grooves  133  and thereby fix the fan  50  on the heat sink  10 . 
         [0024]    When the heat dissipation  100  is assembled, the heat sink  10  is arranged on the chassis  300  and contacts the electronic component  211 . The body  31  of the clip  30  spans over the heat sink  10 , with the first and second connecting plates  313 ,  314  being located at an outside of the heat sink  10 . The middle portions of the arms  312  of the body  31  are received in the grooves  113  of the heat absorbing portion  11  of the heat sink  10 . The operating member  37  is raised to make the first engaging member  33  move to a corresponding clasp  305  of the chassis  300  until the clasp  305  enters the hole  331  of the first engaging member  33 . Then, the operating member  37  is released and the top portion  353  of the second engaging member  35  is pressed to make the second engaging member  35  move downwardly and outwardly until the through hole  3513  of the bottom portion  351  is aligned with another corresponding clasp  305  of the chassis  300 . Then, the top portion  353  is pushed to make the bottom portion  351  move horizontally towards the chassis  300  until the bottom portion  351  clasps the clasp  305 . The operating member  37  is then rotated relative to the heat sink  10  to drive the second engaging member  35  to move upwardly until the operating member  37  is locked. In this state, a top end of the bottom portion  351  of the second engaging member  35  abuts against a bottom surface of the second connecting plate  314 . Then, the fan  50  is mounted on the top end of the heat sink  10 . Thus, the heat dissipation  100  is assembled to the electronic component  211  tightly. 
         [0025]    In this embodiment, the top portion  353  of the second engaging member  35  is operated to make the bottom portion  353  of the second engaging member  35  clasp the clasp  305  or to disengage from the clasp  305 . Therefore, a tool is not needed for assembly or disassembly of the heat dissipation device. Accordingly, the risk of scraping of other components (not shown) on the PCB  200  is reduced or even eliminated altogether. 
         [0026]    It is to be understood, however, that even though numerous characteristics and advantages of various embodiments have been set forth in the foregoing description, 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.