Abstract:
An electrical connector comprises a tubular body ( 1 ) with a hollow section ( 2 ) having a mouth ( 3 ), a female contact element ( 6 ) with a pair of contact pieces ( 7 ) extending in the hollow section ( 2 ) forming a throat portion ( 8 ) near the mouth ( 3 ), and a window ( 5 ) provided at a position corresponding to said throat portion ( 8 ).

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to electrical connectors with a female contact element.  
           [0003]    2. Description of the Related Art  
           [0004]    [0004]FIG. 4 shows a conventional connector of this type. An insulating housing has a tubular body  51  with a mouth  53  communicating with a hollow section  52  in which a female contact element  54  is placed.  
           [0005]    The female contact element  54  has a pair of contact pieces  55  made by bending a metal strip and supported within the hollow section  52 . The contact pieces  55  have free ends near the mouth  53  and are flexible. A throat portion  56  is provided near the free ends, providing an introducing portion  57  between the free end and the throat portion  56 .  
           [0006]    The inside diameter of the mouth  53  is smaller than the diameter of hollow section  52  but sufficiently large to receive a male contact element  61  of a mating connector. The diameter of the knack section  56  is smaller than the diameter of the male contact element  61 .  
           [0007]    When the male contact element  61  is inserted through the mouth  53  and introducing section  57  into the throat portion  56 , the contact pieces  55  are flexed by the male contact element  61  as shown by phantom line, and the male and female contact elements  61  and  54  are connected under a predetermined contact pressure.  
           [0008]    However, the conventional connector has the following disadvantages.  
           [0009]    First of all, it is not certain if the female contact element  54  is placed at a regular position. Usually, the female contact element  54  is inserted into the hollow section  52  from bottom and held at a predetermined position. However, the insertion can be too short to place the introducing section  57  at the regular position, resulting in the poor connection between the female and male contact elements  54  and  61 .  
           [0010]    Secondly, the female contact element  54  and the tubular body  51  have manufacturing and assembling errors. These errors, especially between the mouth  53  and the introducing section  57 , should not exceed the nominal tolerance. The position of the introducing section  57  in the free state prior to contact with the male contact element  61  should be aligned with the edge of the mouth  53 . If the tip of the introducing section  57  falls inside the mouth  53 , the male contact element  61  crashes the introducing section  57 , damaging the female contact element  54 . If the crashing force is very large, the male contact element  61  can be damaged, too.  
         SUMMARY OF THE INVENTION  
         [0011]    Accordingly, it is an object of the invention to provide an electrical connector enabling to check if the female contact element is placed at a regular position.  
           [0012]    It is another object of the invention to provide an electrical connector with a wide introducing section.  
           [0013]    According to the invention there is provided an electrical connector with a female contact element, comprises a tubular body with a hollow section having a mouth at an end of the tubular body; a air of contact pieces of the female contact element extend within the hollow section along axis of the tubular body, at least one of the contact pieces being bent towards the other contact piece near the mouth to thereby provide a throat portion which is flexed back by a pin-like male contact element of a mating connector, and at least one window provided in the tubular body at a position corresponding to the throat portion.  
           [0014]    Whether the throat portion of the female contact element is placed at a regular position is observed through the window. If the female contact element is not at the regular position, it may be eliminated or corrected.  
           [0015]    According to an embodiment of the invention, the window has a width greater than that of the hollow section in a direction perpendicular to the axis of the tubular body to thereby provide a wider introducing area of the contact pieces, thereby preventing the male contact from crashing the female contact element. The window is position in an X direction perpendicular to a Y direction in which the contact pieces are opposed. Alternatively, the window is positioned in the Y direction. An outer conductive shell is provided over the tubular body to adapt it to coaxial connector. 
       
    
    
     BRIEF DESCRIPTION OF THE INVENTION  
       [0016]    [0016]FIG. 1 is a side elevational view, partially in section, of an electrical connector according to an embodiment of the invention;  
         [0017]    [0017]FIG. 2 is a sectional view taken along line  2 - 2  of FIG. 1;  
         [0018]    [0018]FIG. 3 is a perspective view of an electrical connector according to another embodiment of the invention; and  
         [0019]    [0019]FIG. 4 is a sectional view of a conventional electrical connector. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0020]    Embodiments of the invention will now be described with reference to FIGS. 1 and 3.  
         [0021]    In FIGS. 1 and 2, the insulating housing has a tubular body  1  with a hollow section  2  which communicates with a mouth  3  of the tubular body  1 . The tubular body  1  has a substantially cylindrical shape with a shoulder. The hollow section  2  extends along the axis  4  (z-direction) of the tubular body  1  and communicates with the mouth  3  which as a diameter smaller than that of the hollow section  2 . The mouth  3  has an inside diameter slightly larger than the outside diameter of the pin-like male contact element  11  and a tapered portion  3 A gradually broadening toward the end of the tubular body  1 . A window  5  is provided in the tubular body  1  in the radial or X direction. The special relationship between the window  5  and the female contact element  6  within the elongated cavity  2  will be described later.  
         [0022]    The female contact element  6  has a pair of contact pieces  7  and is inserted into the hollow section  2  to a predetermined position. The contact pieces  7  are provided within the hollow section  2  on opposite sides of the axis  4  of the tubular body  1  so as to oppose to each other in the Y direction. The end portions of the contact pieces  7  are bent to provide a throat portion  8 . The distance between the contact pieces  7  in the throat portion  8  is smaller than the outside diameter of the male contact element  11 . An introducing section  7 A, in which the distance between the contact pieces  7  gradually increases, is provided between the throat portion  8  and the free end of the contact piece  7 .  
         [0023]    The size and position of the window  5  are such that they enable to determine whether the throat portion  8  of the female contact element  6  is at the regular position. That is, when the female contact element  6  is inserted into the hollow section  2  of the tubular body  1  at the regular position, the window  5  is positioned within a certain range from the throat portion  8  in the Z direction. The width (Y direction) of the window  5  is greater than the diameter of the hollow section  2 .  
         [0024]    In FIG. 3, windows  5  are provided in both X and Y directions.  
         [0025]    By providing the window  5  wider than the hollow section  5 , it is possible to provide the female contact element  6  with the introducing section  7 A which is greater than the conventional one. The receiving area of the introducing section  7 A is larger than the inside diameter of the mouth  3  of the tubular body  1 . Thus, even if the manufacturing or assembling error of the female contact element  6  and the housing is very large, the introducing section  7 A satisfactorily covers the mouth  3 .  
         [0026]    How to assemble the connector will be described below.  
         [0027]    The female contact element  6  is inserted into the hollow section  2  of the tubular body  1  from left to the predetermined position in FIG. 1. Whether the throat portion  8  of the female contact element  6  is at the regular position is determined by observation through the window  5 . If the throat  8  is not at the regular position, the female contact element  6  is removed and inserted again. When the connector is connected to a mating connector, the window  5  may be used to check if the throat portion  8  is at the regular position.  
         [0028]    Upon entering via the mouth  3 , the male contact element  11  of a mating connector is guided by the introducing section  7 A of the female contact element  6  to the throat portion  8 , wherein it flexes the contact pieces  7  thereby making an electrical connection. Even if the introducing section  7 A is slightly shifted from the regular position, it is able to guide the male contact element  11  to the throat portion  8  without fail.  
         [0029]    As shown in FIGS. 1 and 2, an outer conductive shell  9  is provided around the tubular body  1  to adapt it to a coaxial connector.  
         [0030]    Since a window is provided in the tubular body in such an area that the female contact element is brought into contact with a mating connector, it is possible to detect a defect product during the manufacture, thereby avoiding poor connection at a time of use. By making the window wider than the hollow section, it is possible to broadening the introducing area of the female contact element, thereby avoiding damage to the female contact element by the male contact element even if the position of the introducing section is shifted from the regular position by manufacturing and assembling errors.