Electrical connectors – Including or for use with coaxial cable
Reexamination Certificate
1999-10-08
2001-05-22
Bradley, Paula (Department: 2833)
Electrical connectors
Including or for use with coaxial cable
C439S587000, C439S394000, C439S779000, C439S462000
Reexamination Certificate
active
06234838
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to an improved structure for a coaxial cable connector, and more particularly, to improved hermetic structure for a coaxial cable connector which is able to perfectly shut out moisture therefrom.
(2) Description of the Prior Art
A coaxial cable connector is very well known to people who engage in the work of electronic and communication cable engineering. An F type coaxial cable connector is typically screw combined to an auxiliary interface connector for electrically joining integrally a coaxial cable to various electronic devices such as TV, CB, FM radio receiver or amateur radio systems.
A conventional coaxial cable connector transmits electrical signals by reliably engaging its connector with the coaxial cable shielding layer. However, one of the shortcomings of a conventional coaxial cable connector is its susceptibility to moisture infringement, that is, the moisture infringes into the connector through the clearance between the connector body and the interface connector.
FIG. 1
is a cross sectional view of a conventional coaxial cable connector in engagement with an interface connector. As shown in
FIG. 1
, an F type connector is used as a representative example for all conventional coaxial cable connectors. The F type coaxial cable connector
10
consists of a connector body
11
, an axle collar
12
, a stem
13
co-axially disposed within the axle collar
12
, and a nut
14
surrounding the stem
13
. The connector
10
further includes a sealing element
15
sandwiched between the inner surface of the nut
14
and the outer surface of the stem
13
.
Both the insulating layer and the center conductor of the coaxial cable are inserted within the stem
13
by aligning a terminal
16
of the connector body
11
coincident with the end of the connector
10
so that the connector is engaged with the coaxial cable. Both braided shielding layer and cable jacket are interposed between the outer surface of the stem
13
and the axle collar
12
and are connected by exerting a compressive force with a hexagonal compression tool to the axle collar
12
so as to hermetically engage the connector
10
with the cable jacket.
Incidentally, there is a problem inherent to the combination of the F type coaxial cable connector
10
and an interface connector
17
. That is, the infringement of moisture may occur at the incomplete screw contact surfaces between the nut
14
and the interface connector
17
, as shown by arrow
18
. The infringement of moisture through the clearance shown by arrow
18
between the nut
14
and the interface connector
17
can be prevented by filling a sealing element
15
therebetween. However, the infringement of moisture
19
can further occur at the contact surface between the interface connector
17
and the stem
13
with the result of leaking of wire TV wave and degrading the signal transmission property of the connector
10
. Consequently, the infringement of moisture
19
between the interface connector
17
and the stem
13
still has to be eliminated.
FIG. 2
is a cross sectional view showing the state of an output/input terminal coupling relation between a conventional interface connector and an electronic device.
FIG. 2
shows that the infringement of moisture may occur at the incomplete contact surfaces between the nut
14
and an electronic device
101
. The infringement of moisture
102
can be excluded by means of filling a rubber element
103
thereinto. But such a treatment requires consumption of additional material and increases the manufacturing cost and time.
SUMMARY OF THE INVENTION
In order to solve the above described problem of moisture infringement inherent to the conventional techniques, the present inventor carried out theoretical studies and stimulating experiments, based on these studies and researches, the present inventor came to propose the present invention.
It is an object of the present invention to provide an improved structure for a coaxial connector in which a moisture proof hermetic structure is formed between the nut, the interface connector and the stem so as to shut out moisture infringement.
To carry out the above object, the coaxial cable connector of the present invention consists of a connector body, an axle collar, a stem co-axially within the axle collar, and a nut disposed rotatably surrounding the stem. The nut includes an annular end and a hexagonal body. The annular end has a threaded bore hole which is used for accepting a threaded interface connector. An annular groove is formed around the inner surface of the threaded bore hole; while another annular groove is formed around the outer surface of the threaded interface connector, both for filling with a sealing element thereinto thereby providing a 360 angles annular moisture proof hermetic structure between the interface connector and the nut.
REFERENCES:
patent: 4556271 (1985-12-01), Hubbard
patent: 5295864 (1994-03-01), Birch et al.
patent: 5431583 (1995-07-01), Szegda
patent: 5830009 (1998-11-01), Tettinger
Bradley Paula
Dougherty & Troxell
Leon Edwin A.
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