Cup and heat sink mounting arrangement

A CPU and heat sink mounting arrangement including a CPU shell mounted on a printed circuit board in a vertical position, a heat sink attached to one side of the CPU shell, a fan mount covered on the heat sink and fastened to the CPU shell to hold the heat sink in place, and a plurality of plug shafts respectively inserted through respective through holes on the fan mount and the heat sink into respective oval mounting holes on the CPU shell and then turned through a limited angle to force respective oval locating plates thereof into engagement with the oval mounting holes of the CPU shell.

BACKGROUND OF THE INVENTION 
The present invention relates to a CPU and heat sink mounting arrangement 
which comprises a CPU shell mounted on a printed circuit board in a 
vertical position, a heat sink attached to one side of the CPU shell, a 
fan mount covered on the heat sink and fastened to the CPU shell to hold 
the heat sink in place, and a plurality of plug shafts respectively 
inserted through respective through holes on the fan mount and the heat 
sink and fastened to respective oval mounting holes on the CPU shell 
through a rotary motion within a limited angle. 
Conventionally, a CPU of a personal computer is mounted on a mother board 
in a horizontal position and closely attached to its one side. Nowadays, a 
CPU of an advanced personal computers is installed in a mother board in a 
vertical position so that less installation space on the mother board is 
occupied. When a CPU of a personal computer is installed, a heat 
dissipating device must be attached to one side of the CPU for quick 
dissipation of heat, and fastening means for example springy clamping 
devices are used to fix the heat dissipating device and the CPU together. 
However, attaching a heat dissipating device to a CPU makes the CPU 
heavier at one side. If a CPU is made heavier at one side, an error 
contact tends to occur, and the contact pins of the CPU tend to be 
damaged. 
SUMMARY OF THE INVENTION 
According to one aspect of the present invention, the CPU and heat sink 
mounting arrangement comprises a CPU shell mounted on a printed circuit 
board in a vertical position, a heat sink attached to one side of the CPU 
shell, a fan mount covered on the heat sink and fastened to the CPU shell 
to hold the heat sink in place, and a plurality of plug shafts 
respectively inserted through respective through holes on the fan mount 
and the heat sink into respective oval mounting holes on the CPU shell and 
then turned through a limited angle to force respective oval locating 
plates thereof into engagement with the oval mounting holes of the CPU 
shell. According to another aspect of the present invention, a support 
frame is mounted on the printed circuit board to support the heat sink and 
the fan mount is close contact with the CPU shell.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1, a CPU shell 11 is mounted on a PC (printed circuit) 
board 10 in a vertical position. A heat sink 20 is attached to one side of 
the CPU shell 11. A fan mount 30 is covered on the heat sink 20 and 
fastened to the CPU shell 11 to hold the heat sink 20 in place. A support 
frame 40 is mounted on the PC board 10 to support the heat sink 20 and the 
fan mount 30. 
Referring to FIGS. 2 and 3 and FIG. 1 again, the heat sink 20 and the fan 
mount 30 have respective through holes 21;31 respectively connected to 
respective oval mounting holes 12 of the CPU shell 10 by a respective plug 
shaft 50. The plug shaft 50 has an oval locating plate 51 at one end, and 
a handle 52 at an opposite end. When the plug shaft 50 is inserted through 
one through hole 31 of the fan mount 30 and one through hole 21 of the 
heat sink 20 into one oval mounting hole 12 of the CPU shell 11, it is 
turned through a certain angle to force its oval locating plate 51 into 
engagement with an inside wall of the CPU shell 10 behind the 
corresponding oval mounting hole 12. An annular flange 32 is raised from 
one side of the fan mount 30 around each through hole 31. The annular 
flange 32 comprises an angle notch defining an upper stop edge 33 and a 
lower top edge 34 adapted for limiting the turning angle of the respective 
plug shaft 50. 
The support frame 40 is an elongated frame comprising two legs 41 disposed 
at its two opposite ends, each leg 41 having a bottom plug rod 42 fitted 
into a respective mounting hole 13 on the PC board 10, two mounting strips 
43 disposed at its two opposite ends, each mounting strip 43 having an 
oblong slot 44 fastened to a respective mounting hole 14 on the PC board 
10 by a respective plug member 60, two pairs of coupling lugs 45;46 
respectively disposed at its two opposite ends between the legs 41 and the 
mounting strips 43, and two holding down devices 70 respectively pivoted 
to the coupling lugs 45;46 to secure the heat sink 20 to the support frame 
40. Each holding down device 70 comprises a transverse pivot shaft 71 at 
the bottom pivotably coupled between the respective pair of coupling lugs 
45;46, a top finger strip 73 at the top adapted for turning the pivot 
shaft 71 by hand, and a hooked portion 72 in the middle at an inner side 
moved with the top finger strip 73 into engagement with the radiating fins 
of the heat sink 20 at one side. 
Retainer plates 80 are respectively mounted on the support frame 40. The 
support frame 40 is made in a hollow structure. Each retainer plate 80 
comprises a plurality of downward hooks 81 respectively raised from its 
bottom side and hooked in an open space of the support frame 40, and a 
forward hook 82 extended from its front side and forced into engagement 
with one hook hole 19 of the CPU shell 10. Upward hooks 49 are integral 
with one long side of the support frame 40. When the fan mount 30 is 
covered on the heat sink 20 and supported on the support frame 40, the 
upward hooks 49 are respectively forced into engagement with respective 
hook holes 39 of the fan mount 30. 
Referring to Figures from 4 to 7, when the heat sink 20 and the fan mount 
30 are fastened together and attached to the CPU shell 10, the holding 
down devices 70 are turned upwardly inwards to force the respective hooked 
portions 72 into engagement with the heat sink 20, the upward hooks 49 are 
respectively forced into engagement with the hook holes 39 of the fan 
mount 30, the forward hooks 82 of the retainer plates 80 are respectively 
forced into engagement with the hook holes 19 of the CPU shell 10, the 
plug shafts 50 are respectively inserted through the through holes 31 of 
the fan mount 30 and the through holes 21 of the heat sink 20 into the 
oval mounting holes 12 of the CPU shell 10 and then turned through 
90.degree. angle to force the respective oval locating plates 51 into 
engagement with the oval mounting holes 12 of the CPU shell 10. On the 
contrary, when the plug shafts 50 are turned in the reversed direction to 
disengage the respective oval locating plates 51 from the respective oval 
mounting holes 12 of the CPU shell 10 and the holding down devices 70 are 
respectively turned outwards to disengage the respective hooked portions 
72 from the heat sink 20, the CPU shell 10, the heat sink 20, the fan 
mount 30 and the support frame 40 can then be detached from one another. 
While only one embodiment of the present invention has been shown and 
described, it will be understood that various modifications and changes 
could be made thereunto without departing from the spirit and scope of the 
invention disclosed.