Auto termination BNC T adaptor

An improved terminal BNC T Adaptor disclosed herein is featured for having an improved auto termination installation, which comprises of a female contact in connection with a male contact. Extending both outward and downward from the two lateral sides of the female contact is an oblique panel. Prior to connecting the BNC plug, by means of elasticity the panel will get in touch and press onto a conductive element with ceramic resistance to enable the male contact, the female contact, the conductive element and the ceramic resistance to form a noise blocking circuit, so as to achieve the effect of auto termination. On the contrary, after connecting T Adaptor with BNC plug, the panel will be pushed away from the conductive element by the male contact inside the BNC Plug, and thus stop the noise blocking from functioning. The other end of the ceramic resistance is also connected with an improved conductive voltage cover, to the bottom of which a tether is connected by a retention post to achieve a better grounding effect.

BACKGROUND OF THE INVENTION 
The present invention relates to a BNC (bayonet navy connector) T Adaptor 
which is exclusively used for connecting a computer network. When the 
adaptor is not connecting with a BNC plug, the effect of auto termination 
which has an auto noise disturbance blocking function can be achieved by 
means of a ceramic resistance set in its interior to ensure the quality of 
network signal. 
The BNC T Adaptor has an auto noise disturbance blocking function and is 
the only one of its kind which is covered under U.S. Pat. No. 5,219,299. 
Prior to its operation, the adaptor can automatically be conducted with 
Ceramic Register 6 and conductive plate 5 by means of contact ends 34, 35, 
of Spring Plate 3 to form a circuit capable of blocking noise disturbance, 
so as to form a BNC T Adaptor which is only featured for the function of 
auto termination. 
SUMMARY OF THE INVENTION 
After using, improvement was found to be necessary for the known BNC T 
Adaptor to have the function of auto termination because the pressure 
needed for the aforementioned contact ends 34, 35 to contact the 
conductive plate 5 has to be provided by two counter-folding chips 32, 33, 
which are made by large angle counterfolding and will soon become fatigued 
after having been used for several times, and thus cause poor contact 
between contact ends 34, 35 and conductive plate 5. This will not only 
affect its effective service life, but will also affect its function of 
auto termination. 
On the other hand, the present invention also provides an improved 
conductive voltage cover. Besides conducting the ceramic resistance to 
form a noise blocking circuit, it also has a retention post which is 
tightly inserted into the bottom of the conductive voltage cover. The 
retention post may also be used to connect with a grounding chain to 
strengthen the grounding effect of BNC T Adaptor. In addition, a retention 
ball chain can also be connected for fixing the elements.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Please refer to FIG. 1, from which it can be seen that BNC T Adaptor is 
having a vertical revolving cap 10 and two horizontal BNC Jack 11, 12, of 
which revolving cap 10 is used for connecting the computer network 
adaptor. As indicated in FIG. 3, BNC jack 11, 12 may selectively connect 
with one or two BNC plug 9 which is in connection with other computer to 
complete a network interfacing process. Therefore, network signals can be 
transmitted through male contact 2 of adaptor 1, female contact 3 which 
connects with male contact 2 and male contact 90 inside BNC Plug 9 to the 
computer in connection. To prevent female contact 3 from getting in touch 
with the metallic shell body for grounding purpose, as indicated in FIG. 
1, female contact 3 is wrapped up by insulators 41, 42 before being put 
into the interior of BNC jack 11, 12. Finally, insulators 41, 42 will be 
fixed in the interior of BNC jack 11, 12 by a packing ring 43. The 
disclosure hereof indicates the basic know-how and structure of a BNC T 
Adaptor 1. While the improvement made by the present invention is related 
to the auto termination device formed by female contact 3 and related 
elements. A further description and preferred embodiments are made as 
follows: 
Please refer to FIGS. 1 and 8. Female contact 3 is a metallic piece made 
through punching, folding and electroplating processes, of which the 
central part has a hole-shaped socket 31 into which male contact 2 can be 
housed. Only female thread is available in the interior of socket 31 for 
connecting with male thread 20 which is set at the bottom end of male 
contact 2. In addition, the interior wall of socket 31 can be made with a 
smooth surface for the connecting of male contact 2, which has an 
inverted-hook shaped nonreturn joining bolt 21. Such a tightly matched 
male contact 2 is found to be easier in assembling, and can also achieve 
the effect of not falling off. 
Extending outward from the two lateral sides of sockets 31 are wing panels 
32, 33, which are folded in a slightly downward oblique extension with 
their extreme ends folded in an upward counter-direction to form oblique 
guide planes 320, 330. The counter-folding points 321, 331 have arc-shaped 
sectional planes 322, 332 with a downward opening. Therefore, when 
connecting with BNC plug 9 (refer to FIG. 3), the tip of male contact 90 
will be inserted toward the lower direction of wing panel 33 under the 
guidance of guide planes 320, 330 to keep a sound contacting relationship 
by means of the arc-shaped sectional plane 322 of counter-folding point 
321. 
On each of wing panels 32, 33 lying in between guide planes 320, 330, there 
are a pair of contact feet 34, 35 facing one another and extending 
downward. The contact points 340, 350 at the bottom end of contact foot 
34, 35 should be connected to a level which is slightly lower than that of 
counter-folding points 321, 331 to enable it to get in touch with 
conductive element 5 which comprises a ceramic resistance 6 under a normal 
condition so as to form a noise blocking circuit to get rid of noise 
disturbance. Contact feet 34, 35 are formed by having them bent downward 
from the two lateral sides of wing panel 32, 33. In order not to avoid 
affecting the strength of wing panel 32, 33 herein, wrinkled/folding 
planes 36, 37 will have to be formed by punching at the space lying in 
between contact feet 34, 35 which face one another, so as to herein 
strengthen the anticurving strength of wing panel 32, 33. 
Conductive element 5 is a metallic piece which is also formed by punching, 
bending and electroplating processes. It has an inverted contact part 52 
as well as guide pieces 50, 51 which extend horizontally from contact part 
52 toward the two lateral sides in such a way that contact part 52 can 
exactly be housed into a crevice which is formed by housing grooves 410, 
420 at the bottom edge of insulators 41, 42, so as to achieve the effect 
of positioning. A bridge-type spring piece 52 which is punched at the 
central of the contact part will thus achieve a comparatively better 
contact relationship with ceramic resistance 6. Guide piece will be 
inserted and fixed therein through passages 411, 412 at the bottom edge of 
two parallel insulators 41, 42. Guide piece 50, 51 also have a length 
which is long enough to keep it in touch with contact feet 34, 35. 
Finally, an insulating seat 7 and a micro ceramic resistance 6 which can 
pierce exactly into fixing hole 71 will be put according to the right 
order into neck 13 at the bottom end of adaptor 1, and will be further 
tightly sealed within neck 13 by conductive voltage cover 14. Whereby it 
can be seen from FIG. 2 that male contact 2, female contact 3, conductive 
element 5, ceramic resistance 6 and conductive voltage cover 14 will all 
be conducted to become a noise blocking circuit to present a BND C Adaptor 
with auto termination under a normal condition. And as indicated by FIG. 
3, after any BNC Jack 11 or 12 of adaptor 1 is connected with a BNC plug, 
another male contact 90 which is inserted will push wing panel 33 upward 
to cause contact foot 3 to move away from guide piece 50, and thus get rid 
of the aforementioned function of auto termination. Of course, another 
wing panel 32 which is not connected with BNC plug will maintain the 
function of auto termination under normal conditions to prevent the 
disturbance of external noise. 
After drawing out the aforementioned BNC plug 9, contact foot 35 will 
recover its contacting relationship with piece 50 by the springing force 
of wing panel 33 which is produced when bending downward. By comparing 
wing panels 32, 33 which are slightly bending with the prior art, it can 
be seen that elasticity fatigue will not so easily be found in the former. 
The conductive voltage cover 14 mentioned above is made of know-how covered 
under the aforementioned U.S. Patent. However, another improved conductive 
voltage cover 8 will be disclosed herewith. As shown in FIG. 4, the 
difference between voltage cover 8 and the aforementioned voltage cover 14 
lies in the design in which the bottom end of voltage cover 8 has a bolt 
hole 80 as well as a cylindrical shaped outer wall 81 which extends 
downward from bolt hole 80. An annular specification indication plate 82 
can be fixed on the exterior of cylindrical outer wall 81 on which the 
resistance value and other related data of the aforementioned ceramic 
resistance 6 will be indicated. Therefore, a change may be indicated by 
replacing the indication plate at anytime, even though there is a change 
in the resistance value. And thus ensures better changeability. 
A retention post 83 with an embossed end 830 is tightly inserted into bolt 
hole 80, and the smooth neck 831 may connect with an arch-shaped washer 84 
and grounding chain 85. By means of the pressure exerted by washer 84, the 
connecting ring 850 of grounding chain 85 will be able to keep a sound 
contacting relationship with the hat section 832 of retention post 83, and 
can revolve at will. Connecting ring 851 is fixed at the other end of 
grounding chain 85 onto an appropriate location to strengthen the 
grounding effect of BNC T Adaptor. It would be preferable that weaving 
textured Tether Chain be adapted for grounding chain 85. 
Besides connecting grounding chain 85, the neck 831 of retention post 83 
may also be used to connect retention chain 86 for fixing purpose. Upon 
using retention chain 86, owing to the fact that an outwardly extending 
springing force is available with locking piece 860, 861 at its two ends, 
therefore, a sound contacting relationship can be kept with hat section 
832 and revolve freely without using arch-shaped washer 84. 
Summarizing the above, one can realize that the female contact provided by 
the present invention can offer a much longer effective service life. 
While the improved conductive voltage cover can also provide more 
selective functions to strengthen the function of T Adaptor. Therefore, 
after understanding the know-how and the preferred embodiment of the 
present invention, any of the changes which are simple and of similar 
nature should be regarded as being covered under the technical area of the 
present invention.