CPU heat sink holding-down device

A CPU heat sink holding-down device including a CPU holder, a CPU mounted on the CPU holder, and a heat sink fastened to the CPU holder to hold down the CPU, wherein the heat sink has a fixed loop-like hanger pivotably disposed at one vertical side thereof and hung on a first retainer rod at one vertical side of the CPU holder, two locating bar extended out of an opposite vertical side thereof, a screw rod connected between the locating bars, a movable loop-like hanger turned about said screw rod and hung on a second retainer rod at an opposite vertical side of the CPU holder, and a curved spring plate connected to the movable loop-like hanger for lifting the movable loop-like hanger from the second retainer rod.

BACKGROUND OF THE INVENTION 
The present invention relates to a CPU heat sink holding down device for 
fastening a heat sink to a CPU holder to hold down a CPU by a movable 
loop-like hanger and a fixed loop-like hanger. 
Various computers are well known, and intensively used in every field to 
replace a variety of complicated jobs. In a computer system, the CPU is 
one of the most import part. During the operation of a computer system, 
the CPU will release heat. If heat cannot be quickly carried away, the 
operation of the CPU and the nearby electronic components will be 
affected, causing operation errors. Heat sinks are commonly used and 
mounted on the CPU holder to hold down the CPU. Regular heat sinks 
generally have fastening devices for fastening to the CPU holder. However, 
these fastening devices are specifically designed for specific CPU 
holders, i.e., they are not suitable for all CPU holders. 
SUMMARY OF THE INVENTION 
According to one aspect of the present invention, the heat sink has a fixed 
loop-like hanger at one side and a movable loop-like hanger at an opposite 
side for fastening to respective retainer rods at two opposite side of any 
of a variety of CPU holder. The second loop-like hanger is relatively 
smaller than the fixed loop-like hanger, and can be turned about and moved 
along a transverse screw rod, and therefore the second loop-like hanger 
can be conveniently adjusted to the operative position and secured to the 
corresponding retainer rod on the CPU holder. 
According to another aspect of the present invention, a curved spring plate 
is coupled to the movable loop-like hanger and acted as a lever for 
lifting the movable loop-like hanger from the corresponding retainer rod 
on the CPU holder during a repair or maintenance work.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1, a CPU heat sink holding-down device in accordance with 
the present invention is generally comprised of a CPU holder 3, a CPU 2 
mounted on the CPU holder 3, and a heat sink 1 fastened to the CPU holder 
3 to hold down the CPU 2. The heat sink 1 comprises a plurality of heat 
dissipating holes 11 spaced around the vertical sides thereof, a fixed 
loop-like hanger 17 pivotably disposed at one vertical side thereof, two 
locating bars 13 and 14 extended out of an opposite vertical side thereof, 
a screw rod 15 connected between the locating bars 13 and 14, and a 
movable loop-like hanger 16 turned about the screw rod 15. A fan 12 is 
disposed within the heat sink 1 and controlled to cause currents of air 
for cooling. The CPU holder 3 has two retainer rods 31 at two opposite 
vertical sides thereof. When the heat sink 1 is placed on the CPU2 above 
the CPU holder 3, the fixed and movable loop-like hangers 17 and 16 are 
respectively hung on the retainer rods 31 of the CPU holder 3 to hold down 
the heat sink 1. The movable loop-like hanger 16 has a fastening portion 
161, which is releasably fastened to one retainer rod 31, mounted with a 
curved spring plate 162. 
Referring to FIG. 2, the locating bars 13 and 14 have a respective forked 
rear end 131 or 141 turned at right angles and releasably mounted on a 
respective support 18 inside the heat sink 1. 
Referring to FIG. 3, the movable loop-like hanger 16 can be moved along the 
screw rod 15 to the effective position aiming at the corresponding 
retainer rod 31 on the CPU holder3. 
Referring to FIG. 4A and 4B, the curved spring plate 162 can be used as a 
lever to lift the fastening portion 161 of the movable loop-like hanger 16 
from the corresponding retainer rod 31. In FIG. 4A, the curved spring 
plate 162 acts as a first class lever. In FIG. 4B, the curved spring plate 
162 acts as a second class lever. 
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 without departing from the spirit and scope of the 
invention.