Patent Publication Number: US-7914342-B2

Title: Signal plug

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention is a kind of signal plug, specifically one that makes signal plug assembly more convenient and provides improved signal conductivity. 
     2. Description of the Prior Art 
     As shown in  FIG. 1  conventional signal plugs  10  have a banana plug  100  and an insulation shell  101 ; the banana plug  100  can be inserted into the connecting hole of the signal plug socket joining the two and allowing flow. 
     As shown in  FIG. 2 , the signal plug  11  includes an outer casing  111 , cable holder  112 , contact pin  113  and anchor part  114 . Signal plug  11  can also be plugged into the connecting hole in the banana socket connecting them and allowing flow. 
     As shown in  FIG. 3 , in order to increase conventional signal contact body parts safety and meet the BFA (British Federation of audio) standards, a new conventional signal contact body parts, namely an improved banana plug connector inverted inside the plug were developed. As shown in  FIG. 3 , the conventional signal female plug  12  includes a cable holder  120 , an outer casing  121 , joining pipe  122 , contact pin  123  and anchor part  124 . Joining pipe  122 , contact pin  123  of the conventional signal female plug  12  can be inserted into its outer protective tube with the contact pin  123  fitted on the BFA (British Federation of audio) socket that signals pass between them. 
     The connector between cable holder  120  of the signal female plug  12  and contact pin  123  is a secondary contact which will increase its resistance. Also, the cost of the copper material that cable holder  120  is made of is also high. The fitting of the signal wire is very inconvenient because the outer casing  121  has to be removed for the signal wire to be connected to the cable holder  120 , making use inconvenient. 
     SUMMARY OF THE INVENTION 
     The main objective of this invention is to provide a signal plug that is easy to assemble and has excellent signal conductivity. 
     The main characteristic of this invention is the body has a flexible contact pin on the front and on the end, there is a positioning device and conducting wire anchor parts. The sleeve has a hole passing through it and has a positioning part and joining screw guide hole. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       This invention is better understood by referring to the accompanying drawings, wherein: 
         FIG. 1   a  is a perspective view of a conventional signal plug; 
         FIG. 1   b  is an exploded view of  FIG. 1   a;    
         FIG. 2   a  is a perspective view of a conventional signal plug; 
         FIG. 2   b  is a top view of  FIG. 2   a;    
         FIG. 2   c  is cross-sectional view of a line I-I in  FIG. 2   b;    
         FIG. 3   a  is a perspective view of applicable to the UK BFA&#39;s signal plug; 
         FIG. 3   b  is an exploded view of shown in  FIG. 3   a;    
         FIG. 4  is an exploded view of the first embodiment of the present invention; 
         FIG. 5  is a perspective view of the first embodiment of the present invention; 
         FIG. 6  is cross-section view taken a line II-II; 
         FIG. 7  is a perspective view of the signal plug of using condition in the present invention; 
         FIG. 8  is an exploded view of the first embodiment of the present invention and a partial section of a conventional banana socket; 
         FIG. 9  is a partial cross-sectional view of the first embodiment of the present invention plugged into a conventional banana socket; 
         FIG. 10  is an exploded view of the second embodiment of the present invention; 
         FIG. 11  is a perspective view of the second embodiment of the present invention; 
         FIG. 12  is cross-sectional view taken a line III-III; 
         FIG. 13  is a perspective view of the signal plug of using condition in the present invention; 
         FIG. 14  is an exploded view of the second embodiment of the present invention and a UK BFA&#39;s signal socket; and 
         FIG. 15  is a partial cross-sectional view of the second embodiment of the present invention plugged into a UK BFA&#39;s signal socket. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As is shown in  FIGS. 4˜6 , the first embodiment of this invention comprises mainly of a main body  2  and a sleeve  3 . On the front of the main body  2  there is a C-shaped section contact pin  20  on which there is an elastic edge  200  with a gap. At the end of main body  2  there is a concave part  21  on which there is a positioning device  210 , conducting wire anchor parts  211  and stopper tag  212 . Positioning device  210  comprises of a clip-in shell fragment or reverse tapered teeth. Sleeve  3  has a hole  30  through it. The hole  30  has a step shaped large and small circular groves  300 ,  301  and there is a positioning part  31 , joining screw guide hole  32  and plate  33  on the front of the sleeve  3 . Joining screw guide hole  32  has screw joint parts  320 - 321 . On the top of sleeve  3  there is a polar color ring  34 . 
     When assembling, the main body  2  is inserted through the large circular grove  300  on the end of sleeve  3  and contact pin  20  on main body  2  passes through hole  30 . When main body  2  reaches the plate  33  of the sleeve and slots into stopper tag  212 , positioning device  210  inserted into the positioning part  31  of sleeve  3 . This fixed main body  2  inside sleeve  3  and completes assemble. 
     When installing signal conducting wire (A), all that needed is to pass it through the large circular grove  300  on the end of sleeve  3  and then screw the conducting wire (A) is place using joining screw guide hole  32  and screw joint parts  320  and  321  to fix on conducting wire anchor parts  211  (as shown in  FIG. 7 ), easily completing wire installation and then the present invention can be plugged into a conventional signal socket (as shown in  FIGS. 8 to 9 ). 
     As shown in  FIGS. 10˜12 , the second embodiment of this invention comprises mainly of a main body  2 , a sleeve  3  and a Safety casing  4 . On the front of the main body  2  there is a C-shaped section contact pin  20  on which there is an elastic edge  200  with a gap. At the end of main body  2  there is a concave part  21  on which there is a positioning device  210 , conducting wire anchor parts  211  and stopper tag  212 . Positioning device  210  comprises of a clip-in shell fragment or reverse tapered teeth. Sleeve  3  has a hole  30  through it. The hole  30  has a step shaped large and small circular groves  300 ,  301  and there is a positioning part  31 , joining screw guide hole  32  and plate  33  on the front of the sleeve  3 . Joining screw guide hole  32  has screw joint parts  320 - 321 . There is a polar color ring  34  and registration part  35  on the front of the sleeve  3 . Safety casing  4  is a hollow tube shaped. On the end of safety casing  4  with the largest diameter there is a joining part  40  and annular tuber  41 . Joining part  40  can be threaded. 
     When assembling, the main body  2  is inserted through the large circular grove  300  on the end of sleeve  3  and contact pin  20  on main body  2  passes through hole  30 . When main body  2  reaches the plate  33  of the sleeve  3  and slots into stopper tag  212 , positioning device  210  inserted into the positioning part  31  of sleeve  3 . Then, insert safety casing  4  into main body  2 &#39;s contact pin  20 , fitting joining part  40  and registration part  35  on sleeve  3  together, thus completing assembly. The plug can then be used in accordance with UK BFA (British Federation of audio) standards and when the safety casing  4  is removed it can be used as a normal banana plug. 
     When installing signal conducting wire (A), all that needed is to pass it through the large circular grove  300  on the end of sleeve  3  and then screw the conducting wire (A) is place using joining screw guide hole  32  and screw joint parts  320  and  321  to fix on conducting wire anchor parts  211  (as shown in  FIG. 13 ). The present invention plugged into a BFA (British Federation of audio) signal socket (as shown in  FIGS. 14 to 15 ). 
     The above explanation shows that this invention has the following advantages: 
     1. This signal plug is convenient to assemble. 
     2. This signal plug allows material cost savings to be made. 
     3. This signal plug has a single conductor and high conduction, conducting electricity more smoothly so there is no extra resistance because of secondary contact. 
     4. This signal plug is convenient to use and the wire can be fixed using a screw without moving the outer casing. 
     5. This invention&#39;s main body  2  and sleeve  3  are assembled by fitting together positioning part  31  and plate  33  on the sleeve  3  and positioning device  210  and stopper tag  212 , making the wire on the concave part  21  on main body  2  stable, preventing it sliding or becoming detached. 
     6. This invention&#39;s main body  2  has an elastic edge  200  that effectively holds and penetrates the terminal, completely covering it, making signal transmission between the terminal and main body  2  more accurate and stable. 
     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.