Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2003-04-16
2004-05-04
Chèrvinsky, Boris (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S709000, C361S710000, C257S718000, C257S727000, C174S016300, C165S080300, C024S505000, C024S510000, C024S457000
Reexamination Certificate
active
06731504
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat sink fastener adapted to hold down a heat sink on a CPU (Central Processing Unit) and, more particularly, to a simple structure of heat sink fastener, which can easily be installed without the use of any tools.
2. Description of the Related Art
A CPU (Central Processing Unit) is a computational and control unit of a computer that interprets and executes instructions. By means of definition, the CPU functions as the “brain” of a computer. Following fast development in computer technology, advanced CPUs are made having a relatively smaller size but relatively faster operation speed. During the operation of an advanced CPU, much heat is produced. In order to dissipate heat from the CPU of a computer, a heat sink or cooling means is used.
FIG. 1
illustrates a prior art heat sink fastener fastened to a motherboard
108
to hold down a heat sink
101
on a CPU
109
at the motherboard
108
. This structure of heat sink fastener is comprised of an elongated spring plate
100
, a connecting plate
107
, and a screw
106
. The elongated spring plate
100
is pressed on the top surface of the flat bottom panel of the heat sink
101
, having one end terminating in a downwardly extended fixed end portion
102
, which has a retaining hole
105
fastened to a first lateral side of a CPU holder
104
holding the CPU
109
on the motherboard
108
, and the other end terminating in a free end portion
103
, which is fastened to the connecting plate
107
by the screw
106
. The connecting plate
107
is fixedly located on the motherboard
108
and separated from a second lateral side of the CPU holder
104
by a distance. This design for a heat sink fastener is complicated. Further, a special hand tool must be used when installing this heat sink fastener.
Therefore, it is desirable to provide a heat sink fastener that eliminates the aforesaid drawbacks.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a heat sink fastener, which is easy and inexpensive to manufacture. It is another object of the present invention to provide a heat sink fastener, which is easy to install without the use of any tools. It is still another object of the present invention to provide a heat sink fastener, which occupies less installation space when installed. To achieve these and other objects of the present invention, the heat sink fastener comprises a holding down spring plate. The holding down spring plate has a first end and a second end. A flat bearing portion is formed on the first end. A first hook plate extends from the second end of the holding down spring plate remote from the flat bearing portion. A second hook plate is coupled to the first end of the holding down spring plate. A locking lever is pivoted to the second hook plate in direction substantially perpendicular to the holding down spring plate and turnable relative to the second hook plate between a locked position and an unlocked position. The locking lever has a cam peripherally supported on the flat bearing portion of the holding down spring plate.
REFERENCES:
patent: 6318452 (2001-11-01), Lee
patent: 6421242 (2002-07-01), Chen
patent: 6480384 (2002-11-01), Lo
patent: 6507491 (2003-01-01), Chen
patent: 6522545 (2003-02-01), Shia et al.
patent: 6563716 (2003-05-01), Truong et al.
Chervinsky Boris
Rosenberg , Klein & Lee
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