Heat exchange – With retainer for removable article – Electrical component
Reexamination Certificate
2000-11-13
2001-12-18
Lazarus, Ira S. (Department: 3743)
Heat exchange
With retainer for removable article
Electrical component
C165S185000, C361S697000, C361S709000, C257S722000, C174S016300
Reexamination Certificate
active
06330906
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat sink and, more particularly, to such a heat sink, which uses two tie rods to hold a set of metal radiating fins in parallel, and a metal rack to hold the tie rod and radiating fin assembly.
2. Description of the Related Art
During the operation of a portable computer, for example, a palm-top or notebook computer, the CPU produces much heat, and heat must be quickly carried away from the CPU so as not to affect normal function of the CPU and the related electronic parts. A variety of heat sinks have been disclosed for this purpose.
FIG. 6
shows a heat sink according to the prior art. This structure of heat sink A is extruded from aluminum, comprising a flat bottom wall A
2
, and upright radiating fins A
1
arranged in parallel on the topside of the flat bottom wall A
2
. When in use, the flat bottom wall is attached to the surface of the CPU, and a fan is mounted on the upright radiating fins A
1
at the top.
FIG. 7
shows another structure of heat sink according to the prior art. This structure of heat sink comprises a metal bottom panel C, and a radiating fin body B fixedly mounted on the metal bottom panel C. The radiating fin body B is a narrow, elongated, thin sheet of metal bent into shape, comprising a plurality of radiating fin segments B
1
arranged in parallel. According to the aforesaid two different structures of heat sink, the pitch between the radiating fins A
1
or parallel radiating fin segments B
1
of the radiating fin body B cannot be minimized to the satisfactory state. When increasing the density of the radiating fins A
1
or radiating fin segments B
1
, the thickness of the metal sheet material must be relatively reduced, however a thin thickness of metal sheet material tends to be broken when bending. In order to increase the density of radiating fins, thin spacer means may be used to separate radiating fins from one other after the installation of tie rods means in the radiating fins. This measure complicates the fabrication of the heat sink, and also increases the manufacturing cost of the heat sink. There is also known another structure of heat sink according to the prior art, in which the metal bottom panel has parallel dovetail grooves, and the radiating fins each have a dovetail flange respectively forced into engagement with the dovetail grooves of the metal bottom panel. When fastening the radiating fins to the dovetail grooves of the metal bottom panel, the radiating fins may be forced to break.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a heat sink, which eliminates the aforesaid drawbacks. It is the main object of the present invention to provide a heat sink, which has a plurality of radiating fins arranged densely for quick dissipation of heat. It is another object of the present invention to provide a heat sink, which is easy and inexpensive to manufacture. To achieve these objects, the heat sink of the present invention comprises a substantially U-shaped metal rack defining a receiving space, and a plurality of metal radiating fins tied up with two tie rods and then fastened to the receiving space of the metal rack by welding. The metal radiating fins each have two mounting holes disposed in two diagonal corners. The metal tie rods respectively mounted in the mounting holes of the metal radiating fins, and then peripherally flanged by a press to hold down the metal radiating fins in parallel.
REFERENCES:
patent: 5020586 (1991-06-01), Mansingh
patent: 5406451 (1995-04-01), Korinsky
patent: 5886870 (1999-03-01), Omori
patent: 5947192 (1999-09-01), Kuo
patent: 6062301 (2000-05-01), Lu
patent: 6076594 (2000-06-01), Kuo
patent: 6104609 (2000-08-01), Chen
patent: 6125921 (2000-10-01), Kuo
patent: 6199627 (2001-03-01), Wang
Bacon & Thomas PLLC
Chuan Sheng Corporation, Inc.
Lazarus Ira S.
McKinnon Terrell
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