Abstract:
In a RF microwave connecter for telecommunication, a upper end surface of a central terminal is provided with a sheet type connection portion; whereby, when an inner conducting wire of a coaxial cable is placed on the upper sides of said upper end surface and said connection portion of said central terminal, said connection portion and said sheet are then further allowed to bend to cause said inner conducting wire to be thrust into said fixing groove and a lower end of said insulating sheet to be positioned in said groove to compress the upper side of said inner conducting wire to enable the central terminal and the inner conducting wire to be coupled stably. Furthermore, the central terminal of the connecter is allowed to manufacture more easily.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an electric connecter, and more particularly to a RF (radio frequency) microwave connecter for telecommunication. 
     2. Description of Related Art 
     Please refer to  FIGS. 1A ,  1 B and  1 C. U.S. Pat. No. 6,790,082 discloses a coaxial cable connecter; it allows a hollow portion of an insulator  11  to be coupled to a central terminal; the upper end of the insulator  11  is provided with a groove  111  and a bendable sheet  112  extended upward; the upper end of the central terminal is connected to a first clamping sheet  121  and a second clamping sheet  122 . One end of the first clamping sheet  121  is placed in the groove  111  of the insulator  11 . One end of the second clamping sheet  122  is connected with one end of the first clamping sheet  121 ; another end of the second clamping sheet  122  is positioned above the first clamping sheet  121 . A metal housing  13  is further allowed to couple to the insulator  11 ; one side of the metal housing  13  is coupled to a buckling portion  131 ; the buckling portion  131  is provided with a plurality of pairs of tabs  132 ,  133 ,  134  and  135  are respectively extended outward two sides thereof as  FIG. 1A  shows. An inner wire  21  of a coaxial cable  20  is further allowed to place in the groove  111  and above the first clamping sheet  121 , an inner insulator layer  22  of the coaxial cable  20 , ground conductor layer  23  and outer insulator layer  24  are respectively positioned at the outside of the groove  111  as  FIG. 1B  shows. Furthermore, the buckling portion  131  is caused to bend 90 degrees to be leaned against the upper edge of the metal housing  11  to allow the inner conducting wire  21  to be sandwiched between the first clamping sheet  122  and the first clamping sheet  121 , the sheet  112  is suppressed at the upper side of the second clamping sheet  122  to enable the second clamping sheet  122  and the buckling portion  131  not to contact with each other. And then, the pairs of tabs  132 ,  133 ,  134  and  135  are further bended to cause the tabs  132  and  133  to respectively buckle the metal housing  11  and the tabs  134  and  135  to respectively buckle the ground conductor layer  23  and the outer insulator layer  24  as  FIG. 1C  shows. 
     The connecter assembling manner mentioned above allows the coaxial cable  20  to be coupled to the central terminal at the same time that the buckling portion  131  is bended; it is rather time saving for the manufacturing. But, the structure that the first and the second clamping sheets  121  and  122  are disposed on the upper end of the central terminal is rather not easy to be manufactured and rather high for the manufacturing cost. Furthermore, because the first and the second clamping sheets  121  and  122  are made from harder metal, they can rather not clamp the inner conducting wire 21 tightly. When the distance between the first and the second clamping sheets  121  and  122  after being bended cannot match up with the diameter of the inner conducting wire  21 , the first and the second clamping sheets  121  and  122  can rather not clamp the inner conducting wire  21  stably; it will influence the signal transmission quality and the coaxial cable in use is rather easy to be loosed if an improper pull force is exerted. 
     U.S. Pat. No. 7,025,598 discloses a coaxial electric connecter; it provides a coaxial connecter capable of preventing a tongue part of a dielectric from being inclined while being bended and shrinking the height of the tongue part and a cover to attain to the shortness of the connecter. However, the tongue part is not used to match up with a connection part of a central conductor to sandwich an inner conducting wire of a cable. The inner wire is soldered on the connection part of the central conductor. A soldering step is necessary to be added in the manufacturing of the connecter; it rather wastes the labor hour and increases the product cost. 
     Taiwan Patent No. M307242 and Taiwan Patent N0. M307242 respectively disclose two different RF microwave connecters for telecommunication; they mainly allow the upper end of a central terminal to be provided with a guiding groove and fixing groove; the diameter of the cross section of the guiding groove is larger than the diameter of an inner conducting wire of a coaxial cable, and the diameter of the cross section of the upper end of the fixing groove is smaller than the diameter of the inner conducting wire. Utilizing a particular design that only the inner conducting wire can enter the fixing groove after being thrust allows the inner wire in the fixing groove to be thrust by the wall of the fixing groove to enable the coupling of a central terminal and the inner conducting wire to be more stable and the signal transmission quality to be better. However, a several plate bending steps are necessary to be processed when the central terminal is manufactured, the structures of the guiding groove and the fixing groove can then be formed. As the manufacturing steps is rather complex, it results in the lower production speed and the higher defective rate. Besides, more molds are needed such that the mold fabrication cost is higher. 
     SUMMARY OF THE INVENTION 
     For improving a coupling structure of a central terminal of a RF microwave connecter for telecommunication and an inner conducting wire of a coaxial cable to allow the manufacturing to be more convenient and the defective rate to be decreased, the present invention is proposed. 
     The main object of the present invention is to provide a RF microwave connecter for telecommunication, allowing a central terminal of the connecter and an inner conducting wire of a coaxial wire to be coupled to each other more easily and more time-saving. 
     Another object of the present invention is to provide a RF microwave connecter for telecommunication, allowing a central terminal of the connecter to be manufactured more easily, the production cost is saved and the production yield is elevated. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention can be more fully understood by reference to the following description and accompanying drawings, in which: 
         FIGS. 1A ,  1 B and  1 C are schematic views, respectively showing the assembly processes of a conventional connecter; 
         FIG. 2  is a perspective view, showing each component of a connecter of a first preferred embodiment according to the present invention and a coaxial cable in a separation state. 
         FIGS. 3A ,  3 B and  3 C are schematic views, respectively showing the assembly processes of a connecter of the first embodiment according to the present invention; 
         FIGS. 4A ,  4 B and  4 C are schematically cross sectional views, respectively showing the assembly processes of a connecter of the first embodiment according to the present invention; 
         FIG. 5A  is a perspective view, showing a central terminal of the first embodiment according to the present invention and an inner wire of a coaxial cable in a separation state; 
         FIG. 5B  is a perspective view, showing a central terminal of the first embodiment according to the present invention and an inner wire of a coaxial cable in a folding state; 
         FIG. 6A  is a perspective view, showing each component of a connecter of a second embodiment according to the present invention and a coaxial cable in a separation state; 
         FIG. 6B  is a perspective view, showing each component of a connecter of the second embodiment according to the present invention and a coaxial cable in a coupling state; 
         FIGS. 7A ,  7 B and  7 C are schematic views, respectively showing the assembly processes of a connecter of the second embodiment according to the present invention; 
         FIG. 8A  is a perspective view, showing a central terminal of the second embodiment according to the present invention and an inner wire of a coaxial cable in a separation state; and 
         FIG. 8B  is a perspective view, showing a central terminal of the second embodiment according to the present invention and an inner wire of a coaxial cable in a folding state. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Please refer to  FIGS. 2 ,  3 A to  3 C,  4 A to  4 C,  5 A and  5 B. A RF microwave connecter according to the present invention is adapted to allow the manufacturing of the connecter to be more time saving. A connecter of a first preferred embodiment according to the present invention comprises a metal housing  31 , a plastic insulator  33  and a central terminal  36 . 
     A coupling portion  32  is extended upward from the upper end of the metal housing  31 , the coupling portion  32  is provided with a middle element  321  and a first pair of tabs  322 , a second pair of tabs  323 , a third pair of tabs  324  and a fourth pair of tabs  325  are extended outward from two sides of the middle element  321 ; a pair of L-type arms  311  and  312  extended outward are disposed on the metal housing opposite to the coupling portion  32 , in which there is a spacing  313  between the two L-type arms  311  and  312 . 
     The plastic insulator  33  is put around the inner side of the metal housing  31 , the plastic insulator  33  is provided with a hollow portion  331 ; the upper end of the plastic insulator  33  is provided with a bendable sheet  34  extended upward and a projection portion  35  extended outward levelly; the projection portion  35  is accepted between the two L-type arms  311  and  312 . The sheet  34  is positioned opposite to the projection portion  35 ; the projection portion  35  is provided with a first groove  351  and a second groove  352  communicated with each other, in which the diameter of the cross section of the second groove  352  positioned above the first groove  351  is larger than the diameter of the cross section of the first groove  351 ; the sheet  34  is provided with a first projection portion  341  and a second projection portion  342  respectively corresponding to the first groove  351  and the second groove  352 . 
     The central terminal  36  is engaged with the hollow portion  331  of the plastic insulator  33 ; an upper end surface  361  of the central terminal  36  is provided with a sheet type connection portion  362 ; the lower end of the central terminal  36  is provided with two opposite contact sheets  363  adapted to clamp a male terminal. 
     The connection portion  362  of the central terminal  36  is positioned in the first groove  351  of the projection portion  35 . When an inner conducting wire  41  is caused to position on the .upper sides of the upper end surface  361  and the connection portion  362  of the central terminal  36  and in the first groove  351  and in the meantime, an inner insulator layer  42  of a coaxial cable  40  is placed between the two L-type arms  311  and  312  and extended to the outside of the two L-type arms  311  and  312  as  FIGS. 3B ,  4 B and  5 B show, the coupling portion  32  is then bended to cause the sheet  34  to be bended downward to thrust the inner conducting wire  41  to enable the inner conducting wire  41  to compress the upper end surface  361  and the connection portion  362  of the central terminal  36  to allow the upper end surface  361  and the connection portion  362  to be deformed to attach the inner conducting wire  41  closely, and to cause the second projection portion  342  and the first projection portion  341  of the insulating sheet  34  to be respectively positioned in the second groove  352  and the first groove  351  and compress the upper side of the inner conducting wire  41  to allow the inner conducting wire  41  and the coupling portion  32  not to contact with each other as  3 B,  4 B and  5 B show. In the meantime, the first pair of tabs  322  is buckled on the upper end of the outside of the metal housing  31 , the second pair of tabs  323  is buckled on the outside of the two L-type arms  311  and  312 , and the third pair of tabs  324  and the fourth pair of tabs  325  are respectively buckled on the ground conductor layer  43  and the outside insulator layer  44  of the coaxial cable  41  as  FIGS. 3C and 4C  show. 
     Please refer to  FIGS. 6A ,  6 B,  7 A to  7 C,  8 A and  8 B. A RF microwave connecter of a second preferred embodiment according to the present invention comprises a metal housing  71 , a plastic insulator  73  and a central terminal  76 . 
     A coupling portion  72  is extended upward from the upper end of the metal housing  71 , the coupling portion  72  is provided with a middle element  721  and a first pair of tabs  722 , a second pair of tabs  723 , a third pair of tabs  724  and a fourth pair of tabs  725  are extended outward from two sides of the middle element  721 ; a pair of L-type arms  711  and  712  extended outward are disposed on the metal housing opposite to the coupling portion  72 , in which there is a spacing  713  between the two L-type arms  711  and  712 . 
     The plastic insulator  73  is put around the inner side of the metal housing  71 , the plastic insulator  73  is provided with a hollow portion  731 ; the upper end of the plastic insulator  73  is provided with a bendable sheet  74  extended upward and a projection portion  75  extended outward levelly; the projection portion  75  is accepted between the two L-type arms  711  and  712 . The sheet  74  is positioned opposite to the projection portion  75 ; the projection portion  75  is provided with a groove  751 , in which the sheet  14  is corresponding to the groove  751 . 
     The central terminal  76  is engaged with the hollow portion  731  of the plastic insulator  73 ; an upper end surface  761  of the central terminal  76  is provided with a sheet type connection portion  762 ; the lower end of the central terminal  76  is provided with a round bar type male terminal  763  used for clamping between two contact sheet of a female terminal. 
     The connection portion  762  of the central terminal  76  is positioned in the groove  751  of the projection portion  75 . When an inner conducting wire  41  is caused to position on the upper sides of the upper end surface  761  and the connection portion  762  of the central terminal  76  and in the groove  751  and in the meantime, an inner insulator layer  42  of a coaxial cable  40  is placed between the two L-type arms  711  and  712  and extended to the outside of the two L-type arms  711  and  712 , the connection portion  72  is then bended to cause the sheet  74  to be bended downward to thrust the inner conducting wire  41  to allow the inner conducting wire  41  and the coupling portion  72  not to contact with each other to enable the inner conducting wire  41  to compress the upper end surface  761  and the connection portion  762  of the central terminal  76  to allow the upper end surface  761  and the connection portion  762  to be deformed to attach the inner conducting wire  41  closely. In the meantime, the first pair of tabs  722  is buckled on the upper end of the outside of the metal housing  71 , the second pair of tabs  723  is buckled on the outside of the two L-type arms  711  and  712 , and the third pair of tabs  724  and the fourth pair of tabs  725  are respectively buckled on the ground conductor layer  43  and the outside insulator layer  44  of the coaxial cable  41  as  FIGS. 6B and 7C  shows. 
     In the RF microwave connecter for telecommunication of the second preferred embodiment according to the present invention, the shape and the functions of the sheet  74  of the plastic insulator  73  of the connecter corresponding to the groove  751  can be a shape and functions similar to the sheet  34  of the insulator  33  with the first projection portion  341  and the second projection portion  342  respectively corresponding to the first groove  351  and the second groove  352  shown in  FIG. 2 , thereupon detailed figures and description are omitted here. 
     The present invention allows a central terminal of a connecter to be manufactured more easily and a mold fabrication to be cheaper. Besides, the coupling between the central terminal and an inner conducting wire of a coaxial cable can de done more easily and more time saving, and the central terminal of the connecter and the inner conducting wire of the coaxial cable are enabled to couple more closely and not to loose such that the manufacturing yield is elevated. 
     Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.