Buckles – buttons – clasps – etc. – Clasp – clip – support-clamp – or required component thereof – Dissociable gripping members
Reexamination Certificate
1999-10-05
2001-07-10
Brittain, James R. (Department: 3626)
Buckles, buttons, clasps, etc.
Clasp, clip, support-clamp, or required component thereof
Dissociable gripping members
C361S704000
Reexamination Certificate
active
06256846
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a fastening device, and particularly to a fastening device for attaching a heat sink to a CPU package.
Fastening devices for attaching a heat sink to a CPU package are classified in two groups: one-piece type and two-piece type. A one-piece type fastening device is shown in FIG.
6
and comprises a base
21
and a pair of locking portions
22
,
23
extending from lateral ends of the base
21
. Each locking portion
22
,
23
comprises an opening
24
,
25
. Since the one-piece type fastening device is rigid to provide a reliable locking force, assembly to a heat sink is difficult.
FIG. 7
illustrates a two-piece type fastening device comprising a main plate
31
and a locking element
32
for attaching to a heat sink. However, since the locking element
32
of the two-piece type fastening device is pendular, the effects of external vibration cannot be reliably compensated.
Thus, there is a need for a new fastening device which is easily and reliably attached to a heat sink of a CPU package.
BRIEF SUMMARY OF THE INVENTION
A main object of the present invention is to provide a fastening device for facilitating attachment of a heat sink to a CPU package.
To fulfill the above-mentioned object, according to a preferred embodiment of the present invention, a fastening device comprises a base, a first locking portion and a second locking portion. The base is received in a central slot of a heat sink for providing a spring force and attaching the heat sink to a CPU package. The first and second locking portion each form an opening for engaging with corresponding projections formed on lateral edges of a socket connector. A pair of extending plates is formed on lateral edges of the second locking portion. The extending plates are folded in an “L” shape and face each other thereby forming a receiving space for receiving an external tool. A locking plate is formed in the second locking portion.
In another embodiment of the fastening device, a locking element is formed by stamping a metal plate. The locking element comprises a body and a handle. An engaging hole is formed in the body. In assembly, the body is received in the receiving space formed by the extending plates, and the engaging hole engages the locking plate. Thus, a heat sink can be securely attached to a CPU package by the fastening device.
In a further embodiment of the fastening device, a locking element comprises a body and a handle. A locking plate is formed in the body. A locking hole is formed on a second locking portion of the fastening device. In assembly, the locking plate engages the locking hole to attach a heat sink to a CPU package.
REFERENCES:
patent: 5295043 (1994-03-01), Beijer
patent: 5828553 (1998-10-01), Chiou
patent: 5933325 (1999-08-01), Hou
patent: 5979025 (1999-11-01), Horng
patent: 5991152 (1999-11-01), Chiou
patent: 6023832 (2000-02-01), Boe
patent: 6025994 (2000-02-01), Chiou
patent: 6111752 (2000-08-01), Huang et al.
Brittain James R.
Chung Wei Te
Hon Hai - Precision Ind. Co., Ltd.
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