Abstract:
An electrical contact limiter structure of wire connection terminal has a simplified structure and is easy to operate to enhance the stability of the operation and motion of a metal leaf spring. The wire connection terminal includes conductive components mounted in the insulation case and electrical contact assembled with the conductive components. The electrical contact has a limiter for receiving the metal leaf spring and restricting moving path thereof. The limiter is partitioned into at least one space. A limitation mechanism is assembled with the limiter. The metal leaf spring is mounted in the space. The wiring circuits or conductive wires coming from an apparatus can be easily directly plugged into the space of the limiter to insert with the metal leaf spring. The limiter and the limitation mechanism cooperatively prevent the metal leaf spring from being deflected and over-bent and damaged in operation.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
       [0001]    The present invention relates generally to an electrical contact limiter structure of wire connection terminal, and more particularly to an electrical contact equipped with a limiter and a limitation mechanism assembled with the metal leaf springs. The limiter and a limitation mechanism serve to help in restricting the moving path of the metal leaf springs. 
       2. Description of the Related Art 
       [0002]    A conventional wire connection terminal device has an insulation case (generally made of plastic material), a metal component (or so-called electrical conductive component) and a metal leaf spring. The metal component and the metal leaf spring are enclosed in the insulation case to press and electrically connect with a conductive wire plugged in the terminal device. The terminal device can be mounted on an operation panel or a distributor box of an electronic or electrical apparatus as an electrical wiring connection device. With respect to the operation and application of the assembling structure of the conventional wire connection terminal, when the conductive wire is plugged into the case and the wire connector, the conductive wire will first press down the metal leaf spring. Then, the metal leaf spring applies an elastic force to the conductive wire to bite or hold the conductive wire together with the wire connector so as to electrically connect with the conductive wire. It often takes place that when the conductive wire is plugged into the case, due to the large number of plug-in operation and human negligence, the metal bare end of the conductive wire thrusts and damages the case or deflects the metal leaf spring to scrape and break the case and fail to stably hold the conductive wire. In order to improve the above problem, a conventional wire connector limiter is assembled with the wire connector to restrict the moving path of the metal leaf spring. 
         [0003]    In operation and detachment process of the conventional wire connection terminal with the electrical contact, the limiter structure and the metal leaf spring, a tool (such as a screwdriver or the like) is used to press down the metal leaf spring and forcedly bend the metal leaf spring so as to release the conductive wire from the pressing or biting of the metal leaf spring. However, as well known by those who are skilled in this field, due to the negligence of the operator or in order to truly release the conductive wire from the pressing or biting of the metal leaf spring, the operator often instinctively applies an excessively great force to the metal leaf spring to forcedly over-bend the metal leaf spring. As a result, during the long-term or frequent operation, the metal leaf spring is often pressed down and over-bent. This is easy to cause material fatigue of the metal leaf spring to affect the pressing or biting effect of the metal leaf spring for the conductive wire. This is not what we expect. 
         [0004]    To speak representatively, the above reveals some shortcomings existing in the conventional electrical connection terminal or wire connector and metal leaf spring and the relevant assembling design. In case the structure and assembly of the wire connector and the metal leaf spring are redesigned to be different from the conventional wire connection terminal, the use form of the wire connection terminal can be changed to practically widen the application range thereof. For example, in the condition that the development and design trend of miniaturized terminal device are satisfied and the volume of the terminal device is not increased, the fixing structures or assembling relationship of the conventional wire connector and metal leaf springs are changed, whereby the structure of the terminal device is easy to manufacture and operate so as to improve the shortcomings of the conventional terminal device that the operation is troublesome and time-consuming and the structure is relatively complicated. 
         [0005]    In addition, a wire connection terminal device (or electrical contact) equipped with a limiter and a limitation mechanism is provided. The limiter is connected with the limitation mechanism to truly receive the metal leaf springs and restrict the moving path of the metal leaf springs. Moreover, when an external operational force is applied to the metal leaf spring, the limitation mechanism serves to prevent the metal leaf springs from being over-bent. This is specially considered and required. All the above issues are not specifically suggested or disclosed in the above reference patents. 
       SUMMARY OF THE INVENTION 
       [0006]    It is therefore a primary object of the present invention to provide an electrical contact limiter structure of wire connection terminal, which has a simplified structure and is easy to operate to enhance the stability of the operation and motion of a metal leaf spring. The wire connection terminal includes conductive components mounted in the insulation case and electrical contact assembled with the conductive components. The electrical contact has a limiter for receiving the metal leaf spring and restricting moving path thereof. The limiter is partitioned into at least one space. A limitation mechanism is assembled with the limiter. The metal leaf spring is mounted in the space. The wiring circuits or conductive wires coming from an apparatus can be easily directly plugged into the space of the limiter to insert with the metal leaf spring. The limiter and the limitation mechanism cooperatively prevent the metal leaf spring from being deflected and over-bent and damaged in operation. 
         [0007]    To achieve the above and other objects, the electrical contact limiter structure of the present invention includes a limiter and a limitation mechanism. The limiter includes a first side, a second side connected with the first side, a third side connected with the second side and a fourth side connected with the third side to together form a rectangular frame structure. The first side is bent toward the third side to form a first subsidiary side so as to define a first space. The fourth side is bent toward the second side and extends to form a fifth side. The fifth side and the first side are positioned on the same plane face. The fifth side is bent toward the third side to form a second subsidiary side so as to define a second space. The first and second subsidiary sides are side by side arranged in parallel to each other. 
         [0008]    In the above electrical contact limiter structure, the limitation mechanism includes assembling sections at least formed on the second and fourth sides and a stopper body (detachably) disposed on the assembling sections. The stopper body is a bolt body passing through the assembling sections for restricting the moving range or bending angle of the metal leaf spring. Therefore, when an external operational force is applied to the metal leaf spring, the metal leaf spring is prevented from being over-bent to cause material fatigue or breakage. 
         [0009]    In the above electrical contact limiter structure, the limitation mechanism includes assembling sections at least formed on the second and fourth sides and stopper bodies disposed on the assembling sections. The stopper bodies are plate structures (transversely) extending and protruding from the assembling sections toward the interior of the limiter or the first and second spaces. 
         [0010]    The present invention can be best understood through the following description and accompanying drawings, wherein: 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a perspective view of the electrical contact limiter structure of the present invention, showing the structures of the limiter and the limitation mechanism; 
           [0012]      FIG. 2  is a perspective view of another embodiment of the electrical contact limiter structure of the present invention, showing that the first subsidiary side or the second subsidiary side extends through the third side and the structure of the limitation mechanism; 
           [0013]      FIG. 3  is a perspective view of still another embodiment of the electrical contact limiter structure of the present invention, showing that the first and second subsidiary sides extend to a position in adjacency to the third side and the structure of the limitation mechanism; 
           [0014]      FIG. 4  is a perspective view of a modified embodiment of  FIG. 1 , showing that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0015]      FIG. 5  is a perspective view of a modified embodiment of  FIG. 2 , showing that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0016]      FIG. 6  is a perspective view of a modified embodiment of  FIG. 3 , showing that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0017]      FIG. 7  is a perspective view of the electrical contact limiter structure of the present invention, showing that the bottom end of the third side is formed with an extension section; 
           [0018]      FIG. 8  is a perspective view of another embodiment of the electrical contact limiter structure of the present invention, showing that the first subsidiary side or the second subsidiary side extends through the third side and the structure of the limitation mechanism; 
           [0019]      FIG. 9  is a perspective view of still another embodiment of the electrical contact limiter structure of the present invention, showing that the first and second subsidiary sides extend to a position in adjacency to the third side and the structure of the limitation mechanism; 
           [0020]      FIG. 10  is a perspective view of a preferred embodiment of the electrical contact limiter structure of the present invention, showing that the first subsidiary side or the second subsidiary side extends through the third side and the structure of the limitation mechanism and a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0021]      FIG. 11  is a perspective view of a modified embodiment of  FIG. 7 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0022]      FIG. 12  is a perspective view of a modified embodiment of  FIG. 8 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0023]      FIG. 13  is a perspective view of a modified embodiment of  FIG. 9 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0024]      FIG. 14  is a perspective view of a preferred embodiment of the electrical contact limiter structure of the present invention, showing that the bottom end of the third side is formed with a subsidiary section and an extension section; 
           [0025]      FIG. 15  is a perspective view of another embodiment of the electrical contact limiter structure of the present invention, showing that the first subsidiary side or the second subsidiary side extends through the third side and the structure of the limitation mechanism; 
           [0026]      FIG. 16  is a perspective view of still another embodiment of the electrical contact limiter structure of the present invention, showing that the first and second subsidiary sides extend to a position in adjacency to the third side and the structure of the limitation mechanism; 
           [0027]      FIG. 17  is a perspective view of a preferred embodiment of the electrical contact limiter structure of the present invention, showing that the first and second subsidiary sides extend to a position in adjacency to the third side and the structure of the limitation mechanism; 
           [0028]      FIG. 18  is a perspective view of a modified embodiment of  FIG. 14 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0029]      FIG. 19  is a perspective view of a modified embodiment of  FIG. 15 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0030]      FIG. 20  is a perspective view of a modified embodiment of  FIG. 19 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0031]      FIG. 21  is a perspective view of a modified embodiment of  FIG. 17 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0032]      FIG. 22  is a perspective view of a preferred embodiment of the electrical contact limiter structure of the present invention, showing that the bottom end of the third side is formed with a subsidiary section, an arched section and an extension section; 
           [0033]      FIG. 23  is a perspective view of another embodiment of the electrical contact limiter structure of the present invention, showing that the first subsidiary side or the second subsidiary side extends through the third side and the structure of the limitation mechanism; 
           [0034]      FIG. 24  is a perspective view of still another embodiment of the electrical contact limiter structure of the present invention, showing that the first and second subsidiary sides extend to a position in adjacency to the third side and the structure of the limitation mechanism; 
           [0035]      FIG. 25  is a perspective view of a preferred embodiment of the electrical contact limiter structure of the present invention, showing that the first and second subsidiary sides extend to a position in adjacency to the third side and the structure of the limitation mechanism; 
           [0036]      FIG. 26  is a perspective view of a modified embodiment of  FIG. 22 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; 
           [0037]      FIG. 27  is a perspective view of a preferred embodiment of the electrical contact limiter structure of the present invention, showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides; and 
           [0038]      FIG. 28  is a perspective view of a modified embodiment of  FIG. 25 , showing the limitation mechanism and that a notch is formed at a junction between the second and third sides and another notch is formed at a junction between the third and fourth sides. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0039]    Please refer to  FIG. 1 . The electrical contact limiter structure of wire connection terminal of the present invention includes a limiter  10  and a limitation mechanism  20  assembled with the limiter  10 . The limiter  10  and the limitation mechanism  20  are mountable in an insulation case and assembled with a conductive support, an electrical contact and a metal leaf spring to form a pushbutton switch device, electrical connection terminal or the like device for pivotally connecting with a wiring circuit or conductive wire coming from an electronic or electrical apparatus. (This pertains to prior art and thus is not shown in the drawings). Basically, according to the application form or mode, the limiter  10  defines at least one (internal) space to permit at least one conductive wire to plug in and assemble with the metal leaf spring. 
         [0040]    In a preferred embodiment, the limiter  10  is selectively made of a flat blank material with higher rigidity or hardness, such as iron, steel, etc. The flat blank material is processed to form a rectangular frame structure of the limiter  10  as shown in  FIG. 1 . 
         [0041]    As shown in the drawings, the limiter  10  includes a first side  11 , a second side  12  connected with the first side  11 , a third side  13  connected with the second side  12  and a fourth side  14  connected with the third side  13 . The first side  11  is bent toward the third side  13  to form a first subsidiary side  16 . (For example, the first side  11  and the first subsidiary side  16  can contain an acute angle, a right angle or an obtuse angle) to define a first space  18 . 
         [0042]    As shown in the drawings, the fourth side  14  is bent toward the second side  12  and extends to form a fifth side  15 . The fifth side  15  and the first side  11  are positioned on the same plane face. The fifth side  15  is bent toward the third side  13  and extends to form a second subsidiary side  17 . (For example, the fifth side  15  and the second subsidiary side  17  can contain an acute angle, a right angle or an obtuse angle) to define a second space  19 . The first and second subsidiary sides  16 ,  17  are side by side arranged in parallel to each other. The lengths of the first and second subsidiary sides  16 ,  17  are respectively smaller than the lengths of the second and fourth sides  12 ,  14  (or the lengths of the first and second subsidiary sides  16 ,  17  are respectively larger than or equal to ½ of the lengths of the second and fourth sides  12 ,  14 ), whereby the first space  18  communicates with the second space  19 . The first and second spaces  18 ,  19  together or respectively receive and assemble with the metal leaf spring, whereby the metal leaf spring can swing within the limiter  10  (or the first and second spaces  18 ,  19 ) to securely hold the conductive wire. 
         [0043]    In a conventional metal leaf spring structure, the metal leaf spring has the form of a forked structure with two leg sections for respectively pressing two conductive wires plugged into the limiter  10 . Therefore, in this embodiment, at least the second side  12  and the first subsidiary side  16  and the fourth side  14  and the second subsidiary side  17  respectively help in restricting the moving path of the two leg sections of the metal leaf spring. 
         [0044]    Also, as shown in  FIG. 1 , an upper end of the third side  13  of the limiter  10  is (perpendicularly) bent to form an extension section  30 . The extension section  30  can selectively electrically contact the other components of the switch device or the electrical connection terminal to close the circuit or non-contact with the other components to open the circuit. 
         [0045]    In this embodiment, the limitation mechanism  20  includes assembling sections  21  at least disposed on the second and fourth sides  12 ,  14  of the limiter  10  and a stopper body  22  disposed on the assembling sections  21 . The stopper body  22  is a bolt body with a cross section of quadrangular configuration. The stopper body  22  is detachably transversely passed through the limiter  10  (or the first and second spaces  18 ,  19 ) and fitted with the assembling sections  21  for restricting the moving range or bending angle of the metal leaf spring. Therefore, when an external operational force is applied to the metal leaf spring, the metal leaf spring is prevented from being over-bent to cause material fatigue or breakage. 
         [0046]    As shown in the drawings, the assembling sections  21  have the form of perforation structure and are positioned on the second and fourth sides  12 ,  14  closer to the third side  13 . In addition, the assembling sections  21  are arranged by an inclination angle. With the reference axis X of the drawing as a reference basis, the assembling sections  21  are arranged by such an inclination angle that the assembling sections  21  are downward inclined from the first side  11  or the fifth side  15  toward the third side  13 . After the stopper body  22  is assembled with the assembling sections  21  in the inclined form, when an operator operates to press down and bend the metal leaf spring, the metal leaf spring is leant against the plane face section of the stopper body  22 . This not only can minify the possibility of over-bending of the metal leaf spring, but also is beneficial to the pressing/leaning cooperation between the metal leaf spring and the stopper body  22 . 
         [0047]    In a preferred embodiment, leg sections  12   a ,  14   a  protrude from the bottom ends or bottom sections of the second and fourth sides  12 ,  14  of the limiter  10 . In addition, finger sections  12   b ,  14   b  are formed on (lateral sides) of the leg sections  12   a ,  14   a . The finger sections  12   b ,  14   b  help in securely assembling the limiter  10  with the metal leaf springs (or the conductive support, electrical contact, etc.) 
         [0048]    Please refer to  FIG. 2 . The third side  13  is formed with a window  13   a  and the first subsidiary side  16  (and/or the second subsidiary side  17 ) is formed with a protrusion end  16   a . The total length of the first subsidiary side  16  and the protrusion end  16   a  is larger than the length of the second subsidiary side  17 . Therefore, the protrusion end  16   a  can extend into or pass through the window  13   a . In this case, the window  13   a  can restrict and bear the first subsidiary side  16  (and/or the second subsidiary side  17 ) to form a stable structure without deflection. Accordingly, in the operation process, the metal leaf springs will not deflect or shake so as to together truly restrict the moving path of the metal leaf springs. 
         [0049]    As shown in  FIGS. 2 and 3 , the first subsidiary side  16  of the limiter extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, at least the second side  12  and the first subsidiary side  16  help in restricting the moving path of one metal leaf spring and the fourth side  14  and the second subsidiary side  17  help in restricting the moving path of another metal leaf spring. 
         [0050]      FIG. 3  shows that the length of the first subsidiary side  16  is equal to the length of the second subsidiary side  17 . Also, in a modified embodiment as shown in  FIG. 3 , the limitation mechanism  20  at least includes the assembling sections  21  formed on the second and the fourth sides  12 ,  14  and the stopper bodies  22  disposed on the assembling sections  21 . The stopper bodies  22  are plate structures (transversely) extending and protruding from the assembling sections  21  toward the interior of the limiter  10  or the first and second spaces  18 ,  19 . 
         [0051]    As shown in  FIG. 3 , corresponding to the assembling sections  21  formed on the second and the fourth sides  12 ,  14  and the stopper bodies  22  disposed on the assembling sections  21 , the first and second subsidiary sides  16 ,  17  are respectively formed with assembling sections  21  and stopper bodies, which are plate structures extending and protruding from the assembling sections  21  toward the first and second spaces  18 ,  19 . 
         [0052]    In a preferred embodiment as shown in  FIG. 3 , the assembling sections  21  and the stopper bodies  22  of the second and fourth sides  12 ,  14  and/or the first and second subsidiary sides  16 ,  17  are also arranged by an inclination angle. With the reference axis X of the drawing as a reference basis, the stopper bodies  22  (and/or the assembling sections  21 ) are arranged by such an inclination angle that the stopper bodies  22  (and/or the assembling sections  21 ) are downward inclined from the first side  11  or the fifth side  15  toward the third side  13 . 
         [0053]    It should be noted that the stopper bodies  22  are arranged in an inclined form, whereby when an operator operates to press down and bend the metal leaf spring, the metal leaf spring is leant against the plane face section of the stopper body  22 . This not only can minify the possibility of over-bending of the metal leaf spring, but also is beneficial to the pressing/leaning cooperation between the metal leaf spring and the stopper body  22 . 
         [0054]    As shown in  FIG. 3 , the plate structures of the stopper bodies  22  can be formed by means of punching. In a preferred embodiment, the stopper bodies  22  of the limitation mechanism  20  can be directly disposed on the second and fourth sides  12 ,  14  and/or the first and second subsidiary sides  16 ,  17 . Alternatively, the stopper bodies  22  can be disposed on the second and fourth sides  12 ,  14  and/or the first and second subsidiary sides  16 ,  17  by means of adhesion. 
         [0055]    Please now refer to  FIGS. 4, 5 and 6 .  FIG. 4  shows a modified embodiment of  FIG. 1 .  FIG. 5  shows a modified embodiment of  FIG. 2 .  FIG. 6  shows a modified embodiment of  FIG. 3 . As shown in the drawings, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The notches  123 ,  124  serve to help in securely assembling the limiter  10  with the metal leaf springs.  FIG. 4  also shows that the finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . The finger sections  12   b ,  14   b  serve to cooperate with the notches  123 ,  134  to securely assemble with the metal leaf springs. 
         [0056]      FIG. 6  also shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper bodies  22 . The stopper bodies  22  are plate structures (transversely) extending and protruding from the assembling sections  21  toward the interior of the limiter  10  or the first and second spaces  18 ,  19 . In addition, the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21 . 
         [0057]    Please now refer to  FIGS. 7 and 8 . In a preferred embodiment, leg sections  12   a ,  14   a  are formed at the bottom ends of the second and fourth sides  12 ,  14  of the limiter  10 . In addition, finger sections  12   b ,  14   b  are formed on (lateral sides) of the leg sections  12   a ,  14   a . Also, the bottom end of the third side  13  is (perpendicularly) bent to form the extension section  30 . 
         [0058]    Referring to  FIGS. 7 and 8 , the lengths or positions of the first and second subsidiary sides  16 ,  17  are respectively identical to what are shown in  FIGS. 1 and 2 .  FIG. 8  also shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. In addition, the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21 . 
         [0059]      FIG. 9  shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21 . 
         [0060]    Please refer to  FIG. 10 . The bottom end of the third side  13  is (perpendicularly) bent to form the extension section  30 . The third side  13  is formed with a window  13   a  to assemble with the protrusion end  16   a  of the first subsidiary side  16 . In addition, a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0061]      FIG. 11  shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. In addition, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0062]      FIG. 11  shows that the lengths or positions of the first and second subsidiary sides  16 ,  17  are identical to what are shown in  FIGS. 1, 4 and 7 . 
         [0063]    Please refer to  FIG. 12 . The first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The protrusion end  16   a  of the first subsidiary side  16  passes through the window  13   a  of the third side to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 .  FIG. 12  also shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21 . 
         [0064]      FIG. 13  shows that the second and fourth sides  12 ,  14  and the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0065]    Please refer to  FIGS. 14 and 15 . In a modified embodiment of  FIGS. 1 and 2 , the bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form a subsidiary section  35 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0066]      FIG. 16  shows that the second and fourth sides  12 ,  14  and the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper body  22  in the form of a bolt body is assembled with the assembling sections  21 . The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, the bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form a subsidiary section  35 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0067]      FIG. 17  shows that the second and fourth sides  12 ,  14  and the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, the bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form a subsidiary section  35 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0068]      FIG. 18  shows a modified embodiment of  FIG. 14 . According to this embodiment, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0069]      FIG. 19  shows a modified embodiment of  FIG. 15 . According to this embodiment, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0070]      FIG. 20  shows a modified embodiment of  FIG. 19 . According to this embodiment, the second and fourth sides  12 ,  14  and the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. 
         [0071]      FIG. 21  shows a modified embodiment of  FIG. 17 . According to this embodiment, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0072]    Please now refer to  FIG. 22 . The second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position by a length larger than ½ of the length of the second side  12  so as to define a first space  18 . The second subsidiary side  17  extends to a position by a length larger than ½ of the length of the fourth side  14  so as to define a second space  19 . The first and second spaces  18 ,  19  communicate with each other. In addition, the leg sections  12   a ,  14   a  are formed at the bottom ends of the second and fourth sides  12 ,  14  of the limiter  10  and the finger sections  12   b ,  14   b  are formed on (lateral sides) of the leg sections  12   a ,  14   a . The bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form an arched section  36  and a subsidiary section  35  connected with the arched section  36 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0073]      FIG. 23  shows a modified embodiment of  FIG. 15 . According to this embodiment, the bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form an arched section  36  and a subsidiary section  35  connected with the arched section  36 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0074]      FIG. 24  shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, the bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form an arched section  36  and a subsidiary section  35  connected with the arched section  36 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 .  FIG. 24  also shows that the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21 . 
         [0075]      FIG. 25  shows that the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, the bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form an arched section  36  and a subsidiary section  35  connected with the arched section  36 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 .  FIG. 25  also shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21 . 
         [0076]      FIG. 26  shows a modified embodiment of  FIG. 22 . According to this embodiment, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0077]      FIG. 27  shows that the second and fourth sides  12 ,  14  are formed with the assembling sections  21  and the stopper body  22  in the form of a bolt body is assembled with the assembling sections  21 . The protrusion end  16   a  of the first subsidiary side  16  passes through the window  13   a  of the third side to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . 
         [0078]      FIG. 28  shows that the first and second subsidiary sides  16 ,  17  are formed with the assembling sections  21  and the stopper bodies  22  in the form of the plate structures. The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define the first space  18  with a fully closed periphery. The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define the second space  19  with a fully closed periphery. In addition, in the limiter  10 , a notch  123  is formed at a junction between (the upper end) of the second side  12  and (the upper end) of the third side  13  and a notch  134  is formed at a junction between the third side  13  and the fourth side  14 . The finger sections  12   b ,  14   b  are respectively formed on the lateral side of the upper end of the second side  12  in a position adjacent to the notch  123  and the lateral side of the upper end of the fourth side  14  in a position adjacent to the notch  134 . The bottom end of the third side  13  of the limiter is bent toward the upper side of the drawing to form an arched section  36  and a subsidiary section  35  connected with the arched section  36 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0079]    To speak representatively, in the condition that the trend to design miniaturized terminal device is satisfied and the volume of the terminal device is not increased, in comparison with the conventional terminal device, the electrical contact limiter structure of wire connection terminal of the present invention has the following advantages:
       1. The limiter  10 , the limitation mechanism  20  and the relevant components and structures have been redesigned. For example, the limiter  10  includes a first side  11 , a second side  12 , a third side  13 , a fourth side  14  and a fifth side  15 . The first side  11  is bent to form a first subsidiary side  16 . The fifth side  15  is bent to form a second subsidiary side  17  to together define a first space  18  and a second space  19  as a frame structure for receiving and restricting the metal leaf springs. The limitation mechanism  20  includes assembling sections  21  at least disposed on the second and fourth sides  12 ,  14  and/or the first and second subsidiary sides  16 ,  17 . The assembling sections  21  are assembled with a stopper body  22  in the form of a bolt body or stopper bodies  22  in the form of plate structures extending and protruding from the assembling sections toward the interior of the limiter  10 . The fixing structures or assembling relationship of the conventional electrical contact and metal leaf springs are changed and the present invention is obviously different from the conventional wire connection terminal in use and operation form.   2. Especially, the limiter  10  is assembled with the limitation mechanism  20  to restrict the moving range or bending angle of the metal leaf springs. This obviously improves the shortcoming of the conventional wire connection terminal that the due to the long-term or frequent external force operation, the metal leaf spring is often over-bent to cause material fatigue or breakage to affect the pressing or biting effect of the metal leaf spring for the conductive wire. Accordingly, the operation of an operator is facilitated and the limiter and the limitation mechanism are easy to manufacture. Moreover, the shortcomings of the conventional wire connection terminal that the metal bare end of the conductive wire is apt to thrust and damage the case or deflect the metal leaf spring or scrape and break the case and the holding is unstable are as minimized as possible.   3. In case the stopper body has an inclination angle of 0 degree and is parallel to the first side, the third side or the fifth side, the sharp edge of the stopper body will be positioned in the moving path of the pressed down metal leaf spring. As a result, during the long-term and high-frequency operation, the metal leaf spring is easy to damage. Such cooperative structures are not ideal. Therefore, the assembling sections  21  and the stopper bodies  22  are arranged in an inclined state so that when an operator presses down and bend the metal leaf spring, the metal leaf spring is pressed against the plane face section of the stopper bodies  22 . This not only can minify the possibility of over-bending of the metal leaf spring, but also is beneficial to the pressing/leaning cooperation between the metal leaf spring and the stopper bodies  22 .       
 
         [0083]    In conclusion, the electrical contact limiter structure of wire connection terminal of the present invention is different from the conventional wire connection terminal in space form and is advantageous over the conventional wire connection terminal. The electrical connector limiter structure of wire connection terminal of the present invention is greatly advanced and inventive. 
         [0084]    The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.