Heat exchange – With retainer for removable article – Electrical component
Reexamination Certificate
2002-10-08
2003-11-04
Atkinson, Christopher (Department: 3743)
Heat exchange
With retainer for removable article
Electrical component
C165S185000, C257S718000, C257S719000, C361S704000, C361S707000
Reexamination Certificate
active
06640884
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to heat sink fastener adapted to secure a heat sink to a CPU holder and, more particularly, to such a heat sink fastener, which can easily be unfastened when unloading the heat sink.
2. Description of the Related Art
FIG. 1
illustrates the application of a heat sink fastener to secure a heat sink
3
′ to a CPU holder
2
′, keeping the heat sink
3
′ in close contact with the CPU in the CPU holder
2
′. According to this design, the heat sink fastener is comprised of an angled clamping plate
11
′ and a vertical locking plate
12
′. The angled clamping plate
11
′ has one hooked end
111
′ hooked in one of the two hook holes
21
′ of the CPU holder
2
′, and the other end pivoted to the vertical locking plate
12
′. The vertical locking plate
12
has one end pivoted to the angled clamping plate
11
′, and the other end terminating in a hooked portion
121
hooked in the other of the two hook holes
21
′ of the CPU holder
2
′. This structure of heat sink fastener is not satisfactory in function. When installed, the heat sink
3
′ may not be tightly maintained in contact with the surface of the CPU in the CPU holder
2
′. Further, when unloading the heat sink
3
′, a special tool is needed to disengage the heat sink fastener from the CPU holder
2
′.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a heat sink fastener, which eliminates the aforesaid drawbacks. It is therefore one object of the present invention to provide heat sink fastener, which keeps the heat sink positively in close contact with the CPU when installed. It is another object of the present invention to provide a heat sink fastener, which can easily be unfastened. To achieve these and other objects of the present invention, the heat sink fastener comprises a narrow elongated stop plate adapted for engaging into one transversely extended groove of the heat sink, the stop plate having longitudinally and transversely extended end notches at two distal ends thereof and a rectangular locating hole on the middle, an elongated securement member, the securement member having two arched arms symmetrically provided at two distal ends thereof and adapted for engaging into two vertical grooves of the heat sink, the arched arms each having a top notch, which receives one longitudinal end notch of the stop plate, a bottom locating hole, and a distal end terminating in a hooked portion adapted for hooking in one hook hole of the CPU holder, a spring wire rod, the spring wire rod having two curved ends respectively hooked in the bottom locating holes of the arched arms of the elongated securement member, two torsional springs respectively mounted on the curved ends of the spring wire rod and stopped between the arched arms of the securement member and the spring wire rod, a pressure plate fastened to one longitudinal end notch of the stop plate and adapted for pressing by the user to force the securement member away from the stop plate, and a U-shaped spring fastened to the rectangular locating hole of the stop plate and adapted for engaging in one groove of the heat sink.
REFERENCES:
patent: 5870288 (1999-02-01), Chen
patent: 5881800 (1999-03-01), Chung
patent: 5933325 (1999-08-01), Hou
patent: 6049457 (2000-04-01), Lee
patent: 6332251 (2001-12-01), Ho et al.
patent: 6450249 (2002-09-01), Liu
patent: 6473306 (2002-10-01), Koseki et al.
patent: 6477049 (2002-11-01), Lin
patent: 6501657 (2002-12-01), Carr
patent: 6507489 (2003-01-01), McGowan et al.
patent: 6507491 (2003-01-01), Chen
patent: 6510054 (2003-01-01), Chen
patent: 6557625 (2003-05-01), Ma
Atkinson Christopher
Bacon & Thomas PLLC
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