Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2003-02-06
2004-02-24
Chervinsky, Boris (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S719000, C361S695000, C257S719000
Reexamination Certificate
active
06697256
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fastening device for attaching a heat sink to a heat producer and, more particularly, to a fastening device for easily attaching a heat sink to a heat producer supported on a board without risk of jamming of an elastic member during assembling operation.
2. Description of Related Art
FIG. 1
shows a device for attaching a heat sink to a CPU (central processing unit), which is supported on a board
90
provided with through-holes
91
. The heat sink includes a cover
92
having a plurality of tubes
93
for receiving respective fastening members
94
.
Each of the fastening members
94
has a tapered, enlarged resilient head
95
with a diameter larger than that of the through-hole
91
, and has a plurality of openings
96
to make the tapered, enlarged head
95
deformable and resilient enough to squeeze through the through-hole
91
. The enlarged head
95
is then engaged with an underside of the board
90
by an elastic force of a compressed elastic member
97
fitted around the fastening member
94
, thus attaching the heat sink to the CPU.
In the prior art, however, the elastic member
97
has a uniform diameter at its full length. Being compressed during the assembling operation, the elastic member
97
readily becomes larger in diameter and raises its upper end to a larger diameter section of the fastening member
94
, thus being jammed between the fastening member
94
and the tube
93
. The jammed elastic member
97
results in inconvenient detaching operation for the heat sink from the CPU, if it is necessary.
OBJECTS OF THE INVENTION
The object of the present invention is to provide a fastening device for easily attaching a heat sink to a heat producer supported on a board without risk of jamming of an elastic member during assembling operation.
SUMMARY OF THE INVENTION
To achieve the aforementioned objects, the present invention provides improved devices for attaching a heat sink to a heat producer which is supported on a board having through-holes aligned with mounting holes of the heat sink. Each of the improved devices includes a tube adjacent to one mounting hole, a fastening member movably received in the tube, and an elastic member fitted around the fastening member. The fastening member has an enlarged resilient head, a shoulder and a neck extending between the head and the shoulder, with the head adapted to squeeze through the mounting hole and the through-hole for engaging with a side of the board opposite to the tube. The elastic member includes a minimum diameter section fitted around the heck and abutting the shoulder of the fastening member, a maximum diameter section abutting a distal end of the tube, and an intermediate diameter section stretchable between the minimum and maximum diameter sections.
Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5384940 (1995-01-01), Soule et al.
patent: 5730210 (1998-03-01), Kou
patent: 6055159 (2000-04-01), Sun
patent: 6104614 (2000-08-01), Chou et al.
patent: 6307748 (2001-10-01), Lin et al.
patent: 6412546 (2002-07-01), Lin et al.
patent: 6545879 (2003-04-01), Goodwin
Horng Alex
Hsiao Mei-Ying
Tsai Chia-Ching
Bacon & Thomas, PLLc
Chervinsky Boris
Sunonwealth Electric Machine Industry Co. Ltd.
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