Abstract:
An electrical connector limiter structure of wire connection terminal is easily operable to enhance the stability of the operation and motion of metal leaf springs. The wire connection terminal includes conductive components mounted in the insulation case and electrical connector assembled with the conductive components. The electrical connector has a limiter for receiving the metal leaf springs and restricting moving path thereof. The limiter is partitioned to define a first space and a second space with fully closed peripheries, in which the metal leaf springs are mounted. The wiring circuits or conductive wires coming from an apparatus can be easily directly plugged into the first and second spaces of the limiter to insert with the metal leaf springs. The limiter serves to prevent the metal leaf springs from deflecting in operation.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates generally to an electrical connector limiter structure of wire connection terminal, and more particularly to an electrical connector limiter assembled with metal leaf springs. The limiter has higher rigidity and is able to help in fixing and restricting moving path of the metal leaf springs. 
         [0003]    2. Description of the Related Art 
         [0004]    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. 
         [0005]    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. 
         [0006]    However, as well known by those who are skilled in this field, such limiter assembled with the wire connector or the conductive plate has a relatively complicated structure and it is troublesome and time-consuming to process the limiter. Moreover, in the case that two or more conductive wires need to be connected, in practice, it will be necessary to arrange two or more connection terminals and wire connectors for correspondingly connecting with every conductive wire. This will lead to increase of the total volume of the wiring device and occupy extra space. Also, this is unbeneficial to the development and design trend of miniaturized wire connection terminal. This is not what we expect. 
         [0007]    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. 
         [0008]    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. 
         [0009]    In addition, a wire connection terminal device (or electrical connector) equipped with a limiter is provided. The limiter has a first space and a second space with fully closed peripheries for truly receiving the metal leaf springs and restricting the moving path of the metal leaf springs. Moreover, at least two conductive wires can be side by side plugged into the electrical connector to respectively assemble with the metal leaf springs. In order to truly restrict and guide the metal leaf springs, the peripheries of the first and second spaces of the limiter are fully closed. This is specially considered and required. 
         [0010]    This is because in the case that the peripheries of the first and second spaces of the limiter are not fully closed, the limiter will be unable to have sufficient structural strength. Under such circumstance, when a first conductive wire is plugged in, the limiter is bent and compressed. In this case, some sidewalls of the limiter are apt to deform to affect the plug-in operation of the second conductive wire. As a result, the normal (swinging) function and motional form of the metal leaf springs will be affected or interfered with. All these are the shortcomings of the conventional wire connection terminal. 
       SUMMARY OF THE INVENTION 
       [0011]    It is therefore a primary object of the present invention to provide an electrical connector limiter structure of wire connection terminal is easily operable to enhance the stability of the operation and motion of metal leaf springs. The wire connection terminal includes conductive components mounted in the insulation case and electrical connector assembled with the conductive components. The electrical connector has a limiter for receiving the metal leaf springs and restricting moving path thereof. The limiter is partitioned to define a first space and a second space with fully closed peripheries, in which the metal leaf springs are mounted. The wiring circuits or conductive wires coming from an apparatus can be easily directly plugged into the first and second spaces of the limiter to insert with the metal leaf springs. The limiter serves to prevent the metal leaf springs from deflecting in operation. 
         [0012]    To achieve the above and other objects, the electrical connector limiter structure of the present invention includes a limiter. 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. The first subsidiary side extends to a position in adjacency to the third side so as to define a first space with a fully closed periphery. 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. The first and second subsidiary sides are side by side arranged in parallel to each other. The second subsidiary side extends to a position in adjacency to the third side so as to define a second space with a fully closed periphery. 
         [0013]    In the above electrical connector limiter structure, at least the second side and the first subsidiary side help in restricting the moving path of one metal leaf spring and the fourth side and the second subsidiary side help in restricting the moving path of the other metal leaf spring. 
         [0014]    In the above electrical connector limiter structure, the third side is formed with a window and the first subsidiary side and/or the second subsidiary side extends into the window. Accordingly, the window can restrict and bear the first subsidiary side and/or the second subsidiary side 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. 
         [0015]    The present invention can be best understood through the following description and accompanying drawings, wherein: 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]      FIG. 1  is a perspective view of the electrical connector limiter of the present invention, showing the structure of the electrical connector limiter; 
           [0017]      FIG. 2  is a sectional view according to  FIG. 1 , showing that the first subsidiary side and/or the second subsidiary side extends through the window; 
           [0018]      FIG. 3  is a sectional view of a modified embodiment of the present invention according to  FIG. 2 , showing that the first and second subsidiary sides extend to the third side to define the first and second spaces with fully closed peripheries; 
           [0019]      FIG. 4  is a perspective view of the electrical connector limiter of the present invention, 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; 
           [0020]      FIG. 5  is a perspective view of another embodiment of the electrical connector limiter of the present invention, showing that the third side is formed with an extension section and the finger sections are formed at the bottom ends of the second and fourth sides; 
           [0021]      FIG. 6  is a sectional view according to  FIG. 5 ; 
           [0022]      FIG. 7  is a sectional view of a modified embodiment of the present invention according to  FIG. 6 ; 
           [0023]      FIG. 8  is a perspective view of another embodiment of the electrical connector limiter of the present invention, showing that the third side is formed with an extension section; 
           [0024]      FIG. 9  is a perspective view of still another embodiment of the electrical connector limiter of the present invention, showing that the third side is formed with an extension section; 
           [0025]      FIG. 10  is a sectional view according to  FIG. 9 ; 
           [0026]      FIG. 11  is a sectional view of a modified embodiment of the present invention according to  FIG. 10 ; 
           [0027]      FIG. 12  is a perspective view of still another embodiment of the electrical connector limiter of the present invention, showing that the third side is formed with an extension section; 
           [0028]      FIG. 13  is a perspective view of still another embodiment of the electrical connector limiter of the present invention, showing that the third side is formed with an extension section and the second and fourth sides are formed with the finger sections; 
           [0029]      FIG. 14  is a sectional view according to  FIG. 13 ; 
           [0030]      FIG. 15  is a sectional view of a modified embodiment of the present invention according to  FIG. 13 ; and 
           [0031]      FIG. 16  is a perspective view of still another embodiment of the electrical connector limiter of the present invention, 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. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0032]    Please refer to  FIGS. 1, 2 and 3 . The electrical connector limiter structure of wire connection terminal of the present invention is mountable in an insulation case and assembled with a conductive support, an electrical connector and 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  permits at least two conductive wires to plug in and assemble with the metal leaf springs. 
         [0033]    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  FIGS. 1, 2 and 3 . 
         [0034]    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.) The first subsidiary side  16  extends to a position in adjacency to the third side  13  so as to define a first space  18  with a fully closed periphery. 
         [0035]    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 forma 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.) The second subsidiary side  17  extends to a position in adjacency to the third side  13  so as to define a second space  19  with a fully closed periphery. The first and second subsidiary sides  16 ,  17  are side by side arranged in parallel to each other. Metal leaf springs can be respectively received and assembled in the first and second spaces  18 ,  19 , whereby the metal leaf springs can swing within the limiter  10  (or the first and second spaces  18 ,  19 ) to securely hold the conductive wires. 
         [0036]    In this embodiment, 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 the other metal leaf spring. 
         [0037]    As shown in  FIGS. 1 and 2 , the third side  13  is formed with a window  20  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  20 . In this case, the window  20  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. 
         [0038]      FIG. 3  shows that the length of the first subsidiary side  16  is equal to the length of the second subsidiary side  17 . 
         [0039]    It should be noted that the length of the first and second subsidiary sides  16 ,  17  at least is such that the first and second subsidiary sides  16 ,  17  extend to a position close to or adjacent to the third side  13  (or the protrusion end  16   a  of the first subsidiary side  16  passes through the window  20  of the third side  13 ). Under such circumstance, the first and second spaces  18 ,  19  with the fully closed peripheries can be truly defined to make the limiter  10  have sufficient or optimal structural strength for resisting against or bearing the plug-in operation of the conductive wire. Only in this case, the metal leaf springs can be truly received and guided to restrict the moving path thereof. 
         [0040]    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 connector, etc.) 
         [0041]    Also, as shown in the drawings, 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. 
         [0042]    Please now refer to  FIG. 4 . 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 ,  134  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. 
         [0043]    Please refer to  FIGS. 5 and 6 . In the limiter  10 , the leg sections  12   a ,  14   a  are formed at the bottom ends of the second and fourth sides  12 ,  14  and the finger sections  12   b ,  14   b  are formed on (the lateral sides) of the leg sections  12   a ,  14   a . In addition, a bottom end of the third side  13  is (perpendicularly) bent to form the extension section  30 . 
         [0044]    In comparison with  FIGS. 5 and 6 ,  FIG. 7  shows that the length of the first subsidiary side  16  is equal to the length of the second subsidiary side  17 . 
         [0045]    Please refer to  FIG. 8 . In the limiter  10 , the 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 the notch  134  is formed at a junction between the third side  13  and the fourth side  14 .  FIG. 8  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 bottom end of the third side  13  is (perpendicularly) bent to form the extension section  30 . 
         [0046]    Please refer to  FIGS. 9 and 10 . In the limiter  10 , the leg sections  12   a ,  14   a  are formed at the bottom ends of the second and fourth sides  12 ,  14  and the finger sections  12   b ,  14   b  are formed on (the lateral sides) of the leg sections  12   a ,  14   a . In addition, the bottom end of the third side  13  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 . 
         [0047]    In comparison with  FIGS. 9 and 10 ,  FIG. 11  shows that the length of the first subsidiary side  16  is equal to the length of the second subsidiary side  17 . 
         [0048]    Please refer to  FIG. 12 . In the limiter  10 , the 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 the notch  134  is formed at a junction between the third side  13  and the fourth side  14 .  FIG. 12  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 bottom end of the third side  13  is bent toward the upper side of the drawing to form the subsidiary section  35 . The subsidiary section  35  is further bent to a horizontal position and extends to form the extension section  30 . 
         [0049]    Please refer to  FIGS. 13 and 14 . In the limiter  10 , the leg sections  12   a ,  14   a  are formed at the bottom ends of the second and fourth sides  12 ,  14  and the finger sections  12   b ,  14   b  are formed on (the lateral sides) of the leg sections  12   a ,  14   a . In addition, the bottom end of the third side  13  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 . 
         [0050]    In comparison with  FIGS. 13 and 14 ,  FIG. 15  shows that the length of the first subsidiary side  16  is equal to the length of the second subsidiary side  17 . 
         [0051]    Please refer to  FIG. 16 . In the limiter  10 , the 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 the notch  134  is formed at a junction between the third side  13  and the fourth side  14 .  FIG. 16  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 bottom end of the third side  13  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 . 
         [0052]    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 connector limiter structure of wire connection terminal of the present invention has the following advantages:
   1. The limiter  10  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 forma 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  with a fully closed periphery as a frame structure for receiving and restricting the metal leaf springs. At least the first subsidiary side  16  (or the second subsidiary side  17 ) is formed with a protrusion end  16   a . The protrusion end  16   a  passes through or enters the window  20  of the third side  13 . In addition, the limiter  10  is formed with the notches  123 ,  134  and the finger sections  12   b ,  14   b . The third side  13  is formed with an extension section  30  and/or the subsidiary side  35  and the arched section  36 . The fixing structures or assembling relationship of the conventional electrical connector and metal leaf springs are changed and the present invention is obviously different from the conventional terminal device in use and operation form.   2. Especially, the limiter  10  has a first space  18  and a second space  19  with a fully closed periphery, whereby the limiter  10  has an ideal structural strength and is able to truly receive and restrict the moving path of the metal leaf springs. At least two conductive wires can be plugged into the limiter  10  or the electrical connector to respectively assemble with the metal leaf springs. Accordingly, the operation of an operator is facilitated and the limiter  10  is easy to manufacture. Also, the present invention improves the shortcomings of the conventional wire connection terminal that the operation is troublesome and time-consuming, the structure is relatively complicated, the metal bare end of the conductive wire is apt to thrust and damage the case or deflect the metal leaf springs or scrape and break the case and the holding is unstable. That is, the structural design of the limiter  10  apparently improves the shortcoming of the conventional wire connection terminal that the peripheries of the first and second spaces are not fully closed. Under such circumstance, when a first conductive wire is plugged into the conventional wire connection terminal, the limiter is apt to be compressed to lead to deformation of some sidewalls of the limiter. This will affect the plug-in operation of the second conductive wire. As a result, the normal (swinging) function and motional form of the metal leaf springs will be affected or interfered with. The present invention as minimizes the deformation of the sidewalls of the limiter as possible.   
 
         [0055]    In conclusion, the electrical connector 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. 
         [0056]    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.