Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2000-03-28
2001-04-17
Picard, Leo P. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S707000, C361S710000, C361S719000, C165S080300, C165S185000, C174S016300, C257S718000, C257S719000, C257S727000
Reexamination Certificate
active
06219244
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a securing fixture for a heat sink, and especially relates to a securing fixture made from a metallic winding wire for the purpose of fixedly holding the heat sink on a PC board. With which, cost of production and effect of convenient detaching and mounting can be achieved.
2. Description of the Prior Art
CPU's of desktop computers
1
mostly, as the one shown in
FIG. 1
, are inserted each in a connector
2
(PGA base), and then the connector
2
is fixedly connected to a PC board
3
. The CPU
1
will get high temperature during operation, the top of it is provided with a heat sink
4
, so that heat generated from the CPU
1
will be absorbed by the heat sink
4
before heat sinking.
The heat sink
4
is superimposed on the CPU
1
which is inserted in the connector
2
, and has a height difference from that of the PC board
3
. Thereby, when the heat sink
4
is fixed on the CPU
1
, it can be engaged and locked on an edge of the CPU
1
with an engaging member
5
extending downwardly from an edge of the heat sink
4
, or can be engaged and locked on the connector
2
, to complete fixing of the heat sink
4
.
The structure of the engaging member
5
as shown in
FIG. 1
is very simple, it can be integrally formed by injection molding in the way of mass production without further processing. Hence it has the advantage of low cost. However, such engaging member
5
can only be applied to the CPU
1
being inserted in the connector
2
, and thereby has a height difference from the PC board
3
; it cannot be applied to a CPU
1
being directly connected with the PC board
3
.
As shown in
FIG. 2
, a notebook type computer is designed primarily on account of saving space, and has an object of being light, thin and convenient for carrying. Therefore, most elements thereof are surface mounting devices (SMD), i.c. the CPU
1
is fixed on the PC board
3
by the surface mounting technique (SMT) to save space.
The structure directly having the CPU
1
fixed on the PC board
3
does not have a gap for engagement of the engaging member stated above by virtue that the CPU
1
is laid parallelly on the PC board
3
. So that when the heat sink
4
is fixed on the CPU
1
, the PC board
3
and the heat sink
4
must be excavated to form mutual corresponding engaging holes
61
,
62
respectively to be engaged with engaging members
7
. And the heat sink
4
can be superimposed on the top of the CPU
1
and is fixed on the PC board
3
.
The structure of each of the engaging members
7
is shown in
FIGS. 2 and 3
, and is provided on the top thereof with a head
71
, a spring
72
is slipped over the shank of the engaging member
7
which has a bottom end in the shape of an arrow with an engaging end
73
having a diameter larger than that of the corresponding engaging hole
61
(
62
). The engaging end
73
has an opening to permit elastic contracting and stretching of the engaging end
73
. When in use, the head
71
is pressed down to move down the engaging end
73
. When the engaging end
73
is moved to abut on the engaging hole
61
of the heat sink
4
, it can be extended through the engaging hole
61
by virtue that the opening of the engaging end
73
is contracted. When the engaging end
73
is extended through the engaging holes
61
,
62
respectively of the heat sink
4
and the PC board
3
, the engaging end
73
is clastically stretched out to engage beneath the engaging hole
62
of the PC board
3
. In this way, the heat sink
4
superimposed on the top of the CPU
1
can be fixed on the PC board
3
by means of the engaging members
7
. And the function of the springs
72
is to provide elastic action force to render the heat sink
4
tightly lapped over the top surface of the CPU
1
after the engaging members
7
are engaged onto the heat sink
4
and the PC board
3
.
Each of the above stated engaging members
7
needs only a single pressing action to get its effect of convenient use when it is to be fixed on the heat sink
4
, however, it still has the following defects:
1. When it is required to detach the heat sink
4
, a pair of pincers are required to pinch the engaging end
73
for closing under the PC board
3
to reduce the diameter of the engaging end
73
and remove it. The bottom of the PC board
3
is in the lowest layer of the housing of the notebook type computer. Therefore, when it is required to detach the heat sink
4
, the PC board
3
shall be detached firstly, this is troublesome and is a defect in detaching.
2. When in manufacturing the engaging members
7
, a die shall be built, and plastic is used for molding, further, springs
72
are slipped over the engaging members
7
. Cost for building a die is expensive, and slipping over of the springs is time and money consuming, these all increase the cost of production.
SUMMARY OF THE INVENTION
In view of these defects of the conventional engaging members in using and by cost, the inventor provides a securing fixture for the heat sink for a CPU after continuous study and improvement based upon his professional knowledge of manufacturing and practical experience of years in designing and manufacturing of the related products. The present invention can get rid of the defects resided in conventional techniques.
In particular, the securing fixture for the heat sink for a CPU of the present invention is integrally made from a metallic winding wire. The structural body thereof is formed by extending a movable rod section downwardly and then bending it to form an insertion end which is wider on the upper portion and is narrower on the lower end thereof, and then by extending upwardly to form an action rod section of which the top is wound toward the lower end to form a spring section. The movable rod section and the action rod section are enveloped in the spring section, while the insertion end is at the bottom of the spring section. The insertion end is provided on the top thereof with a limiting portion with a width larger than the inner diameter of the engaging hole of the PC board. The insertion end can be engaged beneath the engaging hole of the PC board, while the spring section is stopped above an engaging hole of the heat sink. In this way, the heat sink can be fixed on the PC board by means of a plurality of securing fixtures of the present invention.
The present invention is advantageous in that:
1. The securing fixtures are integrally made from winding metallic wires. It does not need to build an expensive die for manufacturing securing fixtures, nor the securing fixture needs additional processing, thereby the securing fixtures have the effect of saving cost.
2. In detachment, it needs only to slightly push a side of a securing fixture to contract the limiting portion on the top of the insertion end by the linking-up relationship among the action rod section, the movable rod section and the PC board to release the insertion end from the engaging hole of the PC board. Such detachment is very convenient, and when in slightly pushing a side of the securing fixture, if the direction of the pushing force is wrong, the detachment cannot be effected. Hence no dropping due to inadvertent wrong action will occur.
The present invention will be apparent in its particular structure and effects after reading the detailed description of the preferred embodiments thereof in reference to the accompanying drawings.
REFERENCES:
patent: 5283467 (1994-02-01), Goeschel et al.
patent: 5365654 (1994-11-01), Moulton
patent: 5595240 (1997-01-01), Daikoku et al.
patent: 5653672 (1997-08-01), Niinai et al.
patent: 5912804 (1999-06-01), Lawson et al.
patent: 6055159 (2000-04-01), Sun
Bacon & Thomas PLLC
Chervinsky Boris L.
Picard Leo P.
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