Electrical connectors – Including or for use with coaxial cable
Reexamination Certificate
2001-05-07
2002-11-19
Paumen, Gary (Department: 2833)
Electrical connectors
Including or for use with coaxial cable
C439S460000
Reexamination Certificate
active
06482033
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement in a coaxial cable connector plug which is connected to the end of a length of coaxial cable, and a method of making the same.
2. Related Arts
Referring to
FIG. 21
, a multi-connector
10
comprises low-frequency and high-frequency connector sections both packaged in a common casing. The coaxial connector plug
11
constitutes the high-frequency connector section, which can be improved according to the present invention.
The coaxial connector plug
11
has a connector body
14
(see
FIG. 21
) press-fitted in its plug case
12
. A rectangular connector base
15
is applied to the coaxial connector plug
11
for connection to an associated apparatus.
The connector base
15
has an insertion hole
16
made therein. The insertion hole
16
is somewhat larger than the plug-insertion hole
13
of the plug case
12
. The insertion hole
16
of the connector base
15
is center-aligned with the plug-insertion hole
13
of the coaxial connector plug
11
, and the contact end of the connector body
14
is allowed to project in the insertion hole
16
of the connector base
15
.
An engagement sleeve
17
is press-fitted in the plug-insertion hole
13
of the plug case
12
. As shown in
FIG. 23
, the engagement sleeve
17
is circular, and the diameter of the cylindrical space is changed to define different sections as follows: an engagement sleeve section
18
of inner diameter “d
1
” extends a distance “L
1
” from one end of the engagement sleeve
17
; a guide sleeve section
19
of inner diameter “d
2
” (=“d
1
”) extends a distance “L
2
” from the other end of the engagement sleeve
17
; and a slope-and-plateau section
20
of inner diameter “d
3
” (<“d
1
”) is formed in the transition from the guide sleeve section
19
to the engagement sleeve section
18
. The slope-and-plateau section
20
has its conical surface
21
diverging toward the guide sleeve section
19
.
As shown in
FIG. 22
, the connector body
14
has its cylindrical insulator
24
enclosed with a metal holder
25
. The cylindrical insulator
24
has a pin
23
inserted at its center, and the cylindrical insulator
24
is fixed to the base
22
.
The metal holder
25
comprises an open-worked bottom section
26
, two split semi-cylindrical sections
27
integrally connected to the bottom section
26
, and converging spears
29
A and
29
B integrally connected to the split semi-cylindrical sections
27
. The bottom fingers
26
grip the insulator
24
, and the converging spears
29
A and
29
B are arranged circularly to defame a circular space for accommodating an antenna rod (not shown), which is used in transmitting and receiving wireless signals of high frequency.
Each semi-cylindrical section
27
has a lance
30
or
31
cut and raised therefrom. The coaxial cable
32
is fixed to the open-worked bottom section
26
by a fastening member
33
. The core conductor of the coaxial cable
32
is connected to the pin
23
, and the outer shield of the coaxial cable
32
is connected to the metal holder
25
.
As described above, the engagement sleeve
17
is fixed in the coaxial connector plug
11
. The connector body
14
is inserted in the insertion hole
13
of the coaxial connector plug
11
, and in the engagement sleeve
17
, allowing the lances
33
,
31
to be yieldingly bent when passing through the slope-and-plateau transition
20
of inner diameter “d
3
”, and then allowing the lances
30
and
31
to return to their stress-free positions when appearing in the engagement section
18
of inner diameter “d
1
”. Thus, the lances
30
and
31
are caught by the slope-and-plateau transition
20
so that the lances
30
and
31
may prevent the connector body
14
from being removed from the coaxial connector plug
11
.
As described above, the lances
30
and
31
are cut and raised from the semi-cylindrical sections
27
, thus leaving openings thereon to allow leakage of high-frequency electromagnetic wave from the openings of the semi-cylindrical sections
27
. Accordingly the shielding effect is lowered. Also, disadvantageously once the connector body
14
has been inserted into the engagement sleeve
17
, it cannot be pulled out without destroying the connector body
14
. Therefore, the connector body
14
cannot be reused.
SUMMARY OF THE INVENTION
One object of the present invention is to provide a coaxial cable connector plug which is free of the defects as described above.
To attain this object a coaxial cable connector plug comprising a connector body having the end of a coaxial cable fixed therein and a housing having an insertion hole to accommodate the connector body. According to the present invention, the housing has a cantilever-like engagement nail extending in the insertion hole, thereby permitting the connector body to be caught in the insertion hole.
The cantilever-like engagement nail extends toward the inlet of the housing. The housing has a catch hole made in the vicinity of the inlet of the housing, whereby a wedge-like retainer may be caught by a detent when inserted into the space between the connector body and the floor of the housing, thereby fixedly holding the coaxial cable. The housing also has guide slots made in the opposite walls of the housing. The connector body is fixedly held in the housing by allowing the cantilever-like nail and the wedge-like retainer to catch selected parts (i.e., shoulders) of the connector body.
The connector body comprises: a shelled assembly comprising an insulator member having a contact piece inserted into its center hole, the contact piece being connected to the core conductor of the coaxial cable, and a metal shell enclosing the insulator member. A metal sleeve fitted on the coaxial cable makes an electric connection between the outer conductor of the coaxial cable and the metal shell. The connector body is caught by the transition formed from the metal sleeve to the metal shell by the cantilever-like nail. The transition formed from the metal sleeve to the metal shell is defamed to be a conical surface. With the above-described arrangement the electric shielding effect is substantially improved, and the connector body can be reused after bing removed from the connector plug housing.
A method of making a coaxial cable connector plug according to the present invention comprises preparing a cylindrical assembly comprising a metal hollow cylinder shell having an insulator cylinder press-fitted therein, and a length of coaxial cable having a contact piece crimped on its core conductor. The contact piece and subsequent cable length of the coaxial cable is inserted into the cylindrical assembly, and the subsequent cable length-and-overlying cylindrical part is inserted into a metal sleeve to provide a connector body. The connector body is inserted into a housing, and a wedge-like retainer is inserted into the space left between the connector body and the housing floor.
Other objects and advantages of the present invention will be understood from the following description of a coaxial cable connector plug according to one preferred embodiment of the present invention, which is shown in accompanying drawings:
REFERENCES:
patent: 3828305 (1974-08-01), Hogendobler
patent: 4070751 (1978-01-01), Hogendobler et al.
patent: 4787864 (1988-11-01), Hunt et al.
patent: 5931698 (1999-08-01), Kodama
patent: 5975950 (1999-11-01), Yamaguchi
patent: 6183299 (2001-02-01), Ward et al.
patent: 6210223 (2001-04-01), Aoyama et al.
patent: 10-334998 (1998-12-01), None
Endo Takayoshi
Sakurai Kazuaki
Togashi Koji
Harvey James R.
Paumen Gary
SMK Corporation
Wenderoth , Lind & Ponack, L.L.P.
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