Abstract:
A sleeve-type wire connector comprises: a first tube having a first opening end and a connecting end, with a first guiding surface in the first opening end that can retract toward the connecting end thereof; a copper sleeve in the connecting end of the first tube; and a second tube having a connecting end corresponding to the connecting end of the first tube and a second opening end, with a second guiding surface in the second opening end that can retract toward the connecting end thereof.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of Invention 
     The invention relates to a connector and, in particular, to a sleeve-type wire connector that can effectively facilitate smooth connection of wire connecting ends and ensure electrical conductivity thereof. 
     2. Related Art 
     Users often need to connect two wires in order to extend the reach. Normally, one uses a wire connector to connect two wires. However, the conventional wire connector, as shown in  FIG. 4 , is basically a tube with two opposite openings integrally formed by a plastic injector. A body part  62  with a smaller diameter is formed between the two openings  61 . Afterwards, a copper sleeve  63  is then inserted into the body part  62  to form a wire connector. 
     However, the conventional wire connector has a roughly vertical ladder section  64  at the junction between the openings  61  and the inner surface of the copper sleeve  63 . The ladder section  64  is an obstacle for the core lines  66  of the wires  65  to insert. Therefore, the connection may not be sufficiently smooth. Moreover, for a wire  65  comprised of multiple core lines  66 , the outermost core lines  66  are likely bent by the ladder section  64 . This in the end affects the electrical power of the system. 
     Besides, it is more difficult for an injection molding machine to make both ends of the connector expand outward. The involved design is more complicated and costly. Also, due to the complication, the production yield cannot be effectively increased. 
     SUMMARY OF THE INVENTION 
     An objective of the invention is to provide a sleeve-type wire connector that has a lower production cost but can effectively increase the smoothness of wire connections. It can increase the work efficiency, as well as ensure the electrical conductivity of the wires. 
     To achieve the above objective, the disclosed sleeve-type wire connector comprises: 
     a first tube having a first opening end that expands outward and a connecting end, with the inner surface of the first opening end being disposed annularly with a first guiding surface that retracts toward the connecting end thereof and a first stopping surface being formed at the junction between the first guiding surface and the inner surface of the connecting end; 
     a copper sleeve disposed in the connecting end of the first tube and engaged with the first stopping surface of the first tube by its one end; and 
     a second tube having a mounting end corresponding to the connecting end of the first tube and a second opening end that expands outward, with the inner surface of the second opening end being disposed annularly with a second guiding surface that retracts toward the mounting end thereof and a second stopping surface being formed at the junction between the second guiding surface and the inner surface of the mounting end; 
     wherein the second stopping surface of the second tube urges against the other end of the copper sleeve when the mounting end of the second tube is mounted onto the connecting end of the first tube. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will become more fully understood from the detailed description given herein below illustration only, and thus is not limitative of the present invention, and wherein: 
         FIG. 1  is a schematic view of the disclosed structure; 
         FIG. 2  is a schematic view of the invention after assembly; 
         FIG. 3  is a schematic view of the invention in use; and 
         FIG. 4  is a schematic view of a conventional wire connector in use. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements. 
     Please refer to  FIGS. 1 and 2  that show a sleeve-type wire connector according to the invention. It mainly consists of a first tube  11 , a copper sleeve  21 , and a second tube  31 . 
     The first tube  11  is integrally formed by an injection molding machine to be a hollow pipe. Its one end is a first opening end  12  expanding outward, and its other end is a connecting end  13  in communication with the first opening end  12 . The inner surface of the first opening end  12  is provided with a first guiding surface  14  that gradually shrinks toward the connecting end  13 . A first stopping surface  15  is formed at the junction between the first guiding surface  14  and the inner surface of the connecting end  13 . 
     The copper sleeve  21  is also a hollow tube, mounted in the connecting end  13  of the first tube  11 . The outer surface of the copper sleeve  21  exactly attaches to the inner surface of the connecting end  13  of the first tube  11 . When the copper sleeve  21  is accommodated in the connecting end  13  of the first tube  11 , its one end urges against the first stopping surface  15  of the connecting end  13  of the first tube  11 . 
     The second tube  31  is also a hollow tube, integrally formed by an injection molding machine. One end of the second tube  31  is formed with a mounting end  32  that can correspondingly mount onto the connecting end  13  of the first tube  11 . The other end of the second tube  31  is formed with a second opening end  33  expanding outward. The inner surface of the second opening  33  of the second tube  31  is formed with a second guiding surface  34  that gradually reduces toward the mounting end  32 . A second stopping surface  35  is formed at the junction between the second guiding surface  34  and the inner surface of the mounting end  32 . When the mounting end  32  of the second tube  31  is mounted onto the connecting end  13  of the first tube  11 , the inner surface of the mounting end  32  of the second tube  31  exactly attaches to the outer surface of the connecting end  13  of the first tube  11 . Moreover, the second stopping surface  35  of the second tube  31  urges against the other end of the copper sleeve. This firmly fixes and limits the copper sleeve  21 , preventing it from falling off. 
     When assembling the invention, one first directly inserts the copper sleeve  21  into the connecting end  13  of the first tube  11 . Afterwards, the mounting end  32  of the second tube  31  is mounted onto the connecting end  13  of the first tube  11 . This renders the disclosed sleeve-type wire connector. 
     Please refer to  FIG. 3 . When the invention is in use, one can insert two wires  41 ,  51  into the two opening ends  12 ,  33  of the first tube  11  and the second tube  31 , respectively. In this case, the core lines  42 ,  52  of the wires  41 ,  51  are guided respectively by the first guiding surface  14  on the inner surface of the first tube  11  and the second guiding surface  34  on the inner surface of the second tube  31  into the copper sleeve  21  smoothly. Therefore, one does not encounter any difficulty when connecting to the two wires  41 ,  51 . This therefore increases the work efficiency of the user. Later on, the user simply uses a pinch (not shown) to pinch the connected mounting end and the connecting end, fixing the core lines  42 ,  52  of the two wires  41 ,  51  in the copper sleeve  21  for conducting an electrical current. 
     While the guiding surfaces  14 ,  34  smoothly guide the core lines  42 ,  52  of the wires  41 ,  51  into the copper sleeve  21 , the skins  411 ,  511  of the wires  41 ,  51  are blocked by the guiding surfaces  14 ,  34 . That is, the large-diameter ends of the guiding surfaces  14 ,  34  exactly allow the insertion of the skins  411 ,  511 . But the guiding surfaces  14 ,  34  shrinking toward the connecting end  13  and the mounting end  32  block the skins  411 ,  511  of the wires, now allowing only the core lines  42 ,  52  of the wires to enter. This ensures the stability of the electrical conductivity of the wires  41 ,  51  after the connection. 
     The disclosed sleeve-type wire connector has the following advantages: 
     1. The first tube and the second tube are integrally formed using an injection molding machine. They involve simple manufacturing processes and are suitable for mass production. Since the first tube and the second tube are connected by mounting, the assembly is simple and quick. 
     2. The first guiding surface of the first tube and the second guiding surface of the second tube in the invention smoothly guide the core lines of the wires into the copper sleeve. Therefore, one does not encounter any resistance when connecting the two wires. This easy assembly can effectively increase the work efficiency of the user. 
     3. The first guiding surface and the second guiding surface are delicately designed such that the wire skins are prevented from entering the copper sleeve, thereby ensuring the stability of electrical conductivity of the wires. 
     4. One end of the copper sleeve urges against the first stopping surface of the first tube. The second stopping surface of the second tube urges against the other end of the copper sleeve. Therefore, the copper sleeve is firmly fixed and limited so that it does not fall off. 
     Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to people skilled in the art. Therefore, it is contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.