Abstract:
A signal connector having function of abrupt wave protection is provided with a grounding device on a signal transmitting cable to guide abrupt wave to the ground. Thus, electronic equipments can be normally used in a normal condition and also protected by the grounding device, which is bale to guide high voltage or large electric current to the ground if abrupt wave or lightning striking should occur.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a signal connector, particularly to one provided with inside a connecting device of a signal transmitting cable for guiding abrupt wave to the ground so as to protect electronic equipments. 
     Generally, sound and video information of different frequencies is distantly transmitted to the electronic equipment used at home or in an office by means of cables, such as a TV antenna, computer process, network connection and the like. When a cable is led for a certain distance, a signal connector has to be provided on the cable for facilitating connecting another cable, which is led to a room. 
     A conventional signal connector, as shown in FIG. 1, has a fundamental base  1  provided thereon with a grounding device  2  and a connecting device  3 . The grounding device  2  is provided with a hollow threaded base  4  for a conductive wire  6  in a ground wire  5  to contact with and be fixed therein by a press member  7  and a locking nut  8  to let abrupt wave transmitted to the ground by the ground wire  5 . The connecting device  3  has its opposite sides provided with a round male adapter  9  for connecting a cable L, and the male adapter  9  has its outer shell connected with the fundamental base  1  and the ground wire  5 . Therefore only the outer shell of the male adapter  9  has function of grounding, while the abrupt wave of the conductive wire in the cable L cannot be eliminated. 
     SUMMARY OF THE INVENTION 
     One objective of the invention is to offer a signal connector having function of abrupt wave protection, provided with an abrupt wave protective device, not only letting a normal signal transmitted smoothly in a normal condition, but also protecting electronic equipment by guiding abrupt wave to the ground in case high voltage or large electric current should occur. 
     Another objective of the invention is to offer a signal connector having function of abrupt wave protection, provided with a locking shell for an abrupt wave circuit board to be secured therein, letting the abrupt wave circuit board completely received in the locking shell and enabling the signal connector to be firmly locked in position. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is an exploded perspective view of a conventional signal connector: 
     FIG. 2 is an exploded perspective view of a signal connector in the present invention: 
     FIG. 3 is an upper view of the circuit board device of the signal connector in the present invention: 
     FIG. 4 is an exploded perspective and partial cross-sectional view of the signal connector in the present invention: 
     FIG. 5 is a cross-sectional view of the circuit board device in a compressed condition in the present invention: 
     FIG. 6 is a cross-sectional view of the circuit board device assembled in the signal connector in the present invention: and FIG. 7 is a cross-sectional view of a connecting device assembled in the signal connector in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of a signal connector having function of abrupt wave protection in the present invention, as shown in FIGS. 2-7, includes a fundamental base  10 , a grounding device  20 , a connecting device  30  and a circuit board device  40  as main components combined together. 
     The fundamental base  10 , as shown in FIG. 2, has its inner and outer side extending and respectively making up a fixing foot  11  having a diametrical through round hole  12  for fastening the fundamental base  10  on a preset location. 
     The grounding device  20  is positioned at the outer side of the fundamental base  10 , extending upward and forming a round and hollow threaded base  21  having threads  211  on the inner circumferential wall. The hollow threaded base  21  is provided with a U-shaped notch  212  respectively at the front and the rear side for the conductive wire  221  in a ground wire  22  to be positioned therein. The conductive wire  221  is pressed in the two U-shaped notches  212  by a press member  231  under a locking bolt  23  to conduct electricity to the ground, and the locking bolt  23  is threadably combined with the hollow threaded base  21 . 
     The metallic connecting device  30 , as shown in FIGS. 2 and 4, is provided at the inner side of the fundamental base  10 , having a hollow locking shell  31  in the center. The locking shell  31  is formed at the front end with a male adapter  311  having male threads  312  to be pivotally combined with a locking adapter (not shown) for connecting a cable  50 . The male adapter  311  is provided with a stop ring  313  at the inner end, as shown in FIG.  4 . Besides, the locking shell  31  is provided with female threads  314  on the inner wall, an annular recess  315  at the bottom and a shoulder  316  of a relatively small diameter in front of the annular recess  315 . A fitting shell  32  positioned opposite to the locking shell  31  is formed at the front side with an inner connecting portion  321  having male threads  322  to be screwed with the female threads  314  of the locking shell  31  to combine the locking shell  31  with the fitting shell  32  and form an accommodating chamber  33  therein. Further, the fitting shell  32  has annular groove  323  formed between its front edge and the inner connecting portion  321  for an O-shaped gasket  324  to be fitted therein and a male adapter  325  disposed on its rear side, having preset male threads  326  on the outer edge. 
     The circuit board device  40 , as shown in FIGS. 2-4, is received in the accommodating chamber  33  of the connecting device  30 . The circuit bored device  40  is provided with a circuit board  41  having a lengthwise conductive member  411  respectively on the opposite sides and has its left and right side respectively formed with a protruding-out stop member  412  at an intermediate portion to be stuck and secured on the shoulder  316  of the locking shell  31  when the circuit board device  40  is received in the accommodating chamber  33 . A side conductive strip  413  is provided on the topside of the stop member  412 , with a gap  414  formed between the outer side of the conductive member  411  and the side conductive strip  413 . Be sides, the conductive member  411  has its front and rear terminal respectively firmly welded with a clamp adapter  42  to be fitted with an insulating sleeve  43 , and then the clamp adapter  42  and the insulating sleeve  43  are together received respectively in the male connectors  311  and  325  of the locking shell  31  and the fitting shell  32 . 
     In addition, the circuit board  41  is bored with a through round hole  415  in the center for a cylindrical insulating tube  44  to be vertically fitted therein. The insulating tube  44  is formed with a shoulder  441  on its outer edge to be firmly positioned on the round hole  415  of the circuit board  41  and an accommodating hole  442  in the center for receiving an electric induction member  45 . The electric induction member  45  has its upper terminal  451  welded with the conductive member  411  and its lower terminal  452  connected in series with the first terminal  461  of an abrupt wave absorbing member  46 , which has its second terminal  462  connected with a metallic fixing ring  47 . 
     The fixing ring  47  is cone-shaped and composed of an outer ring  471  of a comparatively large diameter and an inner ring  472  of a comparatively small diameter. The inner ring  472  is bored with an engage hole  473  to be welded with the second terminal  462  of the abrupt wave-absorbing member  46 . The inner ring  472  further has its opposite ends respectively bored with a cut groove  474  having a horizontal foot  475  formed at one side to be welded with the side conductive strip  413  to let the fixing ring  47  secured on the circuit board  41 . The fixing ring  47  is compressed to stick firmly in the annular recess  315  of the locking shell  31  after the circuit board  41  is received in the accommodating chamber  33 . 
     In assembling, the insulating tube  44  is fitted in the round hole  415  of the circuit board  41 , and the electric induction member  45  is received in the insulating sleeve  44  to let the circuit board  41  and the electric induction member  45  separated and insulated vertically from each other. Then, the electric induction member  45  has its upper terminal  451  welded with the conductive member  411  and its lower terminal  452  welded with the first terminal  461  of the abrupt wave absorbing member  46 , which has its second terminal  462  welded with the engage hole  473  of the fixing ring  47 . Subsequently, the fixing ring  47  has its two horizontal feet  475  respectively welded with the two side conductive strips  413 . Thus, the fixing ring  47  can be engaged in the annular recess  315 , and the two stop members  412  of the circuit board  41  can be stuck on the shoulder  316  of the locking shell  31 , when the circuit board device  40  is received in the locking shell  31 . Finally, the fitting shell  32  is threadably combined with the locking shell  31 , with the O-shaped gasket  324  fitted in the annular groove  323  of the fitting shell  32  to prevent the accommodating chamber  30  from dampening. 
     Further, the fixing ring  47  made of flexible metal has its opposite connecting member  475  welded firmly on the circuit board device  40  and its engage hole  473  couple with the abrupt wave absorbing member  46 . After the circuit board device  40  is fitted in the connecting device  30  and the flexible fixing ring  47  is received in the locking shell  31 , the fixing ring  47  is compressed by a press tool T to become deformed and stuck firmly in the annular recess  315  inside the locking shell  31 , as shown in FIGS. 5 and 6. Thus, the fixing ring  47  is completely contact flatly with the metallic fundamental base  10 , impossible to shift or fall off and having good capacities of electric conduction and grounding. Furthermore, the fitting shell  32  is threadably combined with the locking shell  31  and the circuit board device  40  is received in the accommodating chamber  33  inside the connecting device  30 , as shown in FIG. 7, therefore the signal connector of this invention has functions of signal connection and abrupt wave absorption. 
     When the electric current of the electric induction member  45  and the abrupt wave absorbing member  46  does not reach a critical value and forms an open circuit, signals can be normally transmitted by the conductive member  411  from the conductive wire  51  of a cable  50  at one side of the conductive member  411  to the conductive wire  51  of another cable  50  at the other side, as shown in FIGS. 2 and 3. But, in case a large current of abrupt wave should occur and the electric current of the electric induction member  45  and the abrupt wave absorbing member  46  rises to exceed the critical value and forms a short circuit, the conductive member  411  can guide the electric current to the fixing ring  47  and the connecting device  30  for grounding, able to completely release the electric current of abrupt wave to the ground. 
     Moreover, between the conductive member  411  and the side conductive strip  413  forms a very small gap  414 , so that when abrupt wave occurs, the abrupt wave of the conductive member  411  can flow to the side conductive strip  413  through the gap  414  and then is guided to the ground by the fixing ring  47 . Evidently, the fixing ring  47  together with the connecting device  30  has functions of electric connection and grounding and is able to completely release abrupt wave to the ground. 
     While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.