Electrical connectors – Self aligning contact – Contact mounted in floating nonconductive holder
Reexamination Certificate
2002-06-19
2004-01-20
Paumen, Gary (Department: 2833)
Electrical connectors
Self aligning contact
Contact mounted in floating nonconductive holder
C439S557000, C411S021000, C411S353000
Reexamination Certificate
active
06679712
ABSTRACT:
FIELD OF
1
THE INVENTION
The present invention is relating to a fixture for an electrical device in general, and more particularly to a fixture for rapidly, easily and stably assembling a heat dissipating device and an electrical device.
BACKGROUND OF THE INVENTION
It is well known that an electrical device of high power such as CPU will produce much heat in run. In order to prevent damaging an electrical device due to overheat, a heat dissipating device is necessary to be installed for conducting heat from the electrical device. In general a heat dissipating device is a heat sink, a cooling fin or a cooling fan etc, and is directly installed above a heating electrical device by wedging method for conducting or dissipating heat. Therefore, a heat dissipating device needs a stable fixture to be closely installed above an electrical device for a good effect of cooling.
As shown in
FIG. 1
, a fixture
10
for adhering a heat sink
20
on the upper surface of CPU
32
is disclosed in Republic Of China (Taiwan) Patent Publication No. 254,450 “fixture for a CPU heat sink”. The fixture
10
includes a tenon
11
that has a head
12
at one end and the other end is an arrow-shaped inverse-pin
13
, wherein a spring
14
is employed around the tenon
11
. While pushing the tenon
11
, the inverse-pin
13
downward passes through through hole
21
of the heat sink
20
and through hole
31
of a PCB
30
(printed circuit board), in which the heat sink
20
is located on the upper surface of CPU
32
and the CPU
32
is bonded on the PCB
30
. Due to an upward spring force from the spring
14
, the tenon
11
inversely wedges the heat sink
20
and PCB
30
. However, while pushing the tenon
11
by hand, it is unable to make the tenon
11
precisely position and stably wedge due to inclination or shake.
As shown in
FIG. 2
, a fixture
40
that comprises several pin devices to assemble and fix the heat sinks
50
on the CPU
62
of a PCB
60
is disclosed in Republic Of China (Taiwan) Patent Publication No. 454,899 “fixture (III) for a CPU heat sink”. The pin device is a tenon
41
that has a head
42
and an insert
43
. A spring
44
is employed between the head
42
and the insert
43
, and a sleeve
45
covers the spring
44
corresponding to the pin device. A through hole
46
is formed at the center of bottom ring of the sleeve
45
for passed through the tenon
41
so that the tenon
41
passes through the through holes
51
of heat sinks
50
and the through hole
61
of PC board
61
for assembling and fixing the heat sinks
50
and the PCB
60
. The head
42
of the tenon
41
must be smaller than upper opening of sleeve
45
for passing through the sleeve
45
while pushing the pin device, and larger than the opening of spring
44
for pushing the spring
44
. However, the tenon
41
and the sleeve
45
of fixture
40
are usually manufactured by plastic injection molding. If the head
42
of tenon
41
deforms due to changing of temperature while running CPU
62
, the head
42
may be unable to pass through the sleeve
45
because of that larger than upper opening of sleeve
45
or unable to push the spring
44
because of that smaller than the opening of spring
44
, so that the fixture
40
is unable to be used normally. Further as shown in
FIG. 3
, it is a known fixture
70
for a CPU heat sink. The fixture
70
includes a tenon
71
that has a head
72
and an insert
73
, and a sleeve
75
. The tenon
71
combines with a conical spring
74
that is covered by a sleeve
75
between the head
72
and the insert
73
. A ring trough
76
is formed around the lip of the sleeve
75
against the large opening
74
a
of conical spring
74
. As shown in
FIG. 4
while pushing the tenon
71
, the head
72
of the tenon
71
compresses against the small opening
74
b
of conical spring
74
to make conical spring
74
stretch, so that the insert
73
of the tenon
71
passes through the through holes
81
of heat sinks
80
and the through hole
91
of PCB
90
to closely wedge the heat sinks
80
on the CPU
92
that is bonded on PCB
90
. However, if the small opening
74
b
of conical spring
74
expands a little, the head
72
of tenon
71
is unable to block the small opening
74
b
of the conical spring
74
but passes through the conical spring
74
. Moreover, while pushing force is big the large opening
74
a
of conical spring
74
easily deformed to make conical spring
74
jump out from the ring trough
76
of sleeve
75
that is against the large opening
74
a
of conical spring
74
. Therefore, the fixture
70
cannot be used durably.
SUMMARY
It is a first object of the present invention to provide a fixture for an electrical device to prevent a spring jumping out from the pin. A ring block is used to limit the spring inside the pin casing. Typically, the ring block is installed against a press portion of a pin to make the spring be compressed.
It is a second object of the present invention to provide a durable fixture for an electrical device. A ring block is installed between press portion of pin and spring and is limited inside pin casing by flange of the pin casing so as to ensure the spring keeping inside the pin casing.
It is a third object of the present invention to provide a fixture for an electrical device that includes a pin casing with round-wall. The round-wall forms at least a flange. A gap is formed at the two sides of flange respectively to elasticized the flange for stuffing the ring block inside the round-wall of pin casing.
It is a fourth object of the present invention to provide a fixture for an electrical device that includes a ring block fastened inside the pin casing. By means of the press portion of pin, the ring block is pushed to make the spring be compressed so that the wedge portion of pin is able to wedge the electrical device closely. Therefore, the effect of easily, rapidly and stably wedging the electrical device can be reached.
According to the present invention, a fixture for an electrical device comprises a pin casing, a spring, a ring block and a pin. A pin casing has a bottom and a round-wall to form a containing trough for placing the spring. The bottom forms a hole and the round-wall forms at least a flange. It is preferable that a gap is formed at the two sides of the flange respectively to make round-wall outward expand for stuffing the ring block inside the pin casing. Also the flange limits the ring block without jumping out. The ring block has a through hole and the pin passes the through hole of ring block, spring and the through hole of bottom of pin casing to combine pin casing, spring, ring block and pin together. The pin has a press portion and a wedging portion. The press portion is used for pushing the ring block to compress the spring. The wedging portion is used for securely wedging an electrical device.
REFERENCES:
patent: 5383790 (1995-01-01), Kerek et al.
patent: 5397244 (1995-03-01), Generoki et al.
patent: 5791850 (1998-08-01), Mundt et al.
patent: 6061240 (2000-05-01), Butterbaugh et al.
patent: 6334750 (2002-01-01), Hsieh
patent: 6364688 (2002-04-01), Fraley et al.
patent: 6409446 (2002-06-01), Schwarz
patent: 6475030 (2002-11-01), Chang
Paumen Gary
Troxell Law Office PLLC
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