Abstract:
A plug contact is provided which comprises a first pin connected to two contact plates arranged parallel to one another. The contact plates are also connected to two further pins which are arranged on a side of the contact plates opposed to the first pin. The three pins are arranged parallel to one another. The two contact plates are connected by connecting elements to the two further pins which are arranged in the region of the connection of the first pin and are guided via a 180° bend to the two further pins. The two contact plates comprise reciprocally associated notches between which a contact region is formed for contacting a contact pin. Owing to the selected geometry it is possible to introduce a contact pin from different directions into the contact region and retain the contact pin.

Description:
FIELD OF THE INVENTION  
       [0001]     This invention relates to a plug contact for a printed circuit board having a contact region defined between two plates and a geometry that allows for introducing a contact pin from different directions into the contact region and retaining the contact pin.  
       BACKGROUND OF THE INVENTION  
       [0002]     A wide variety of plug contacts are known for use on printed circuit boards.  
         [0003]     U.S. Pat. No. 4,934,967 discloses a plug contact for a printed circuit board for connecting a pin arrangement of an electronic circuit. The plug contact has an insulating housing in which openings for introducing a contact pin are provided. A spring contact is arranged in the openings which has two stacked pairs of contact plates. The contact plate pairs are arranged at a fixed spacing from one another. The two contact plates of a contact plate pair issue from a vertically arranged conductor strip and extend substantially vertically to the conductor strip in the form of an open ring. The open region of the ring is arranged opposite the conductor strip. The upper contact plates comprise a respective spring tongue oriented obliquely downwards in the direction of the conductor strip, on a lower side of the upper contact plates in an end region opposite the conductor strip.  
         [0004]     U.S. Pat. No. 6,551,143 B2 a battery contact is known which comprises plug contacts. The plug contacts have a base plate on which two bent side faces are formed. The side faces are arranged substantially at an angle of 90° to the base plate. One respective contact arm is formed issuing from the two side faces. The contact arms are guided toward one another in the direction of the centre of the base plate and arranged above the base plate. The two contact arms have notches, which are each formed inwardly. The notches are arranged at the same level but have a fixed spacing from one another. A contact region is formed between the notches. The external contour of the notch is circular. The notches produce a reliable point contact with an inserted contact.  
         [0005]     U.S. Pat. No. 4,041,358 a measuring instrument comprising a printed circuit board is known which has contact clips for electrically contacting a plug contact with the printed circuit board and which are substantially U-shaped in design. The ends of the contact clips are bent inwards and rest on one another. In addition, a further contact plate is provided which biases the legs of the contact clips on one another.  
       SUMMARY OF THE INVENTION  
       [0006]     A plug contact is provided which comprises a first pin connected to two contact plates arranged parallel to one another. The contact plates are also connected to two further pins which are arranged on a side of the contact plates opposed to the first pin. The three pins are arranged parallel to one another. The two contact plates are connected by connecting elements to the two further pins which are arranged in the region of the connection of the first pin and are guided via a 180° bend to the two further pins. The two contact plates comprise reciprocally associated notches between which a contact region is formed for contacting a contact pin. Owing to the selected geometry it is possible to introduce a contact pin from different directions into the contact region and retain the contact pin. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]     The invention will be described in more detail hereinafter with reference to the figures, in which:  
         [0008]      FIG. 1  is a perspective view of a plug contact with a holding clip according to an exemplary embodiment of the invention;  
         [0009]      FIG. 2  is a side view of the plug contact of  FIG. 1 , with the holding clip omitted;  
         [0010]      FIG. 3  is a cross-sectional view through the centre of the plug contact of  FIG. 1 , viewed from the bottom;  
         [0011]      FIG. 4  is an end view of the plug contact of  FIG. 1 , showing a first pin;  
         [0012]      FIG. 5  is a plan view of the plug contact of  FIG. 1  with a pushed-on holding clip;  
         [0013]      FIG. 6  shows the plug contact with pushed-on holding clip from below;  
         [0014]      FIG. 7  shows a cross-section through the plug contact with inserted holding clip;  
         [0015]      FIG. 8  shows a plug contact according to a further exemplary embodiment of the invention;  
         [0016]      FIG. 9  shows a plug contact according to a further exemplary embodiment of the invention with notches of the holding clips which comprise a cruciform slot according to an exemplary embodiment of the invention;  
         [0017]      FIG. 10  is a side view of a plug contact with a printed circuit board and contact pin; and  
         [0018]      FIG. 11  is a perspective view of a plug contact with a laterally inserted contact pin according to an exemplary embodiment of the invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0019]      FIG. 1  shows a plug contact according to an exemplary embodiment of the invention. The plug contact substantially comprises a first pin  1  which is connected to a first and a second contact plates  2 ,  3 . The first and the second contact plates  2 ,  3  are also connected to a third or to a fourth pin  4 ,  5 . The first and the second contact plates  2 ,  3  each comprise a notch  6  which is preferably introduced in the form of a stamping operation into the contact plates  2 ,  3 . The notches  6  are recessed inwardly so the notch  6  of the first contact plate  2  is impressed in the direction of the second contact plate  3  and the notch  6  of the second contact plate  3  in the direction of the first contact plate  2 . A contact region  29  is formed between the notches  6 . The notches  6  have a substantially oval shape which is arranged with the longitudinal side parallel to the longitudinal direction of the rectangular shape of the first or second contact plate  2 . The contact plates are manufactured from a resilient material and are held resiliently between the first, the second and the third pin  1 ,  4 ,  5 . The plug contact, in an exemplary embodiment, is advantageously manufactured in one piece from spring steel. The pins  1 ,  4 ,  5  of the plug contact are inserted into a printed circuit board  27 . Depending on the application, a contact pin can be inserted from below through the printed circuit board or laterally between the contact plates. Two printed circuit boards, for example, may thus be electroconductively connected to one another.  
         [0020]     In addition to the plug contact a holding clip  22  is illustrated which, in a preferred embodiment of the plug contact, is pushed onto the plug contact to bias the contact plates  2 ,  3 .  
         [0021]      FIG. 2  shows a side view of the plug contact. The first pin  1  is connected by a first connecting piece  8  to the first contact plate  2 . The first contact plate  2  has a substantially rectangular shape. The first connecting piece  8  is connected to a lower half of one side of the first contact plate  2 . An upper half of the side is connected by a second connecting piece  9  to a middle piece  14 . A gap  11  is formed between the first and the second connecting piece  8 ,  9 . The gap  11  is arranged half way up the side of the first contact plate  2  and guided into an edge region of the first contact plate  2 . The middle piece  14  is connected in an upper region to a first connecting strip  12 . The first connecting strip  12  is guided to a leading region of the first contact plate  2 . In the leading region the first connecting strip  12  is connected to the third pin  4  arranged substantially parallel to the first pin  1 . In the illustrated embodiment the third pin  4  is arranged laterally on an outer side of the first contact plate  2 . The third pin  4  thus serves in this embodiment as a stop for maximum bending of the first contact plate  2 . The second and third pins  4 ,  5  may be alternatively arranged upstream of the first or second contact plate  2 ,  3 , as a function of the selected embodiment, so that a stop is not provided for the first and the second contact plate  2 ,  3 . The second contact plate  3  is constructed analogously to the first contact plate and connected by a fifth connecting piece  30  to the middle piece  14 . The middle piece  14  is connected to a second connecting strip  18  guided above the second contact plate  3  into the leading region thereof. The second connecting strip  18  is connected to the third pin  5  arranged on the outer side adjacent to the second contact plate. The third pin  5  is used as a lateral stop for the second contact plate  3 . The fifth connecting piece  30  ( FIG. 4 ) is arranged mirror symmetrically to the first connecting piece  8 .  
         [0022]     The first and second connecting strips  12 ,  18  are guided parallel to the first or second contact plate  2  and spaced from the first contact plate  2  by a second gap  13 .  
         [0023]      FIG. 3  shows a section  3 - 3  through the plug contact of  FIG. 2 . The middle piece  14  has, on both sides, first and second connecting tongues  15 ,  16  which are semicircular in cross-section and merge in a lower region into the second or fourth connecting piece  9 ,  17  and in an upper region into the first or second connecting strip  12 ,  18 . The first and the second connecting tongues  15 ,  16  are, in a first region, in the process guided away from the first and second contact plate  2 ,  3  and subsequently oriented via a 180° bend in the direction of the first or the second contact plate  2 ,  3 . The second connecting tongue  16  is connected by the fourth connecting piece  17  to the second contact plate  3 .  
         [0024]     The second connecting piece  9 , the first connecting tongue  15 , the middle piece  14  and the first connecting strip  12  provide a first connecting element via which the first contact plate  2  is resiliently held on the second pin  4 .  
         [0025]     The fourth connecting piece  17 , the second connecting tongue  16 , the middle piece  14  and the second connecting strip  18  provide a second connecting element via which the second contact plate  3  is resiliently held on the third pin  5 .  
         [0026]     The inner faces of the notches  6  of the two contact plates  2 ,  3  preferably have a small spacing, preferably less than 1 mm, or touch. In an upper region the middle piece  14  is connected to the second connecting tab  16  on the second connecting strip  18 . The second connecting strip  18  is arranged mirror symmetrically to the first connecting strip  12  and connected to the second pin  5 . The first and the second connecting strips  12 ,  18  are arranged substantially above the first or the second contact plate  2 ,  3 . The end regions of the first and second connecting strip  12 ,  18  are guided beyond the end of the first or second contact plate  2 ,  3  and returned again upstream of the first or second contact plate via a 180° bend on the outer side of the first or second contact plate and connected in the leading region of the contact plates  2 ,  3  to the third and fourth pins  4 ,  5 . The third and fourth pins  4 ,  5  are arranged laterally on outer sides of the first or second contact plate  2 ,  3  and provide a stop for maximum bending of the first or second contact plate  2 ,  3 . The first and the second connecting tongues  15 ,  16  are connected in the upper region to the first or to the second connecting strip  12 ,  18  and in the lower region to the second or fourth connecting piece  9 ,  17 .  
         [0027]      FIG. 4  shows a view of the plug contact from the side of the first pin  1 . The first, second and third pins  1 ,  4 ,  5  each have a plug end  19  arranged at the same height. The first pin  1  is formed from two pin parts  20 ,  21  folded parallel to one another in a folding operation.  
         [0028]      FIG. 5  shows the plug contact of  FIG. 1  with a pushed-on holding clip  22 . The holding clip  22  has two holding hoops  23 , each comprising a bulge  24  on the inner side in the end region. The bulges  24  are inserted into the notch  6  of the first and second contact plate  2 ,  3 . The hoops  23  are connected to one another by a sixth connecting piece  25 . The sixth connecting piece  25  is inserted into the gap  11 .  
         [0029]      FIG. 6  shows the arrangement of  FIG. 5  from below. The sixth connecting piece  25  is arranged above the first pin  1 .  
         [0030]      FIG. 7  shows a cross-section through the plug contact with the holding clip  22 .  
         [0031]      FIG. 8  shows a partial view of an inner side of the first contact plate  2  of a further embodiment of the plug contact, in which the gap  11  extends into the notches  6  of the first and second contact plate  2 ,  3 . A first and a second contact edge  31 ,  32  adjoining the gap  11  are formed on the notch by the gap  11 .  
         [0032]     As a result of the extended construction of the gap  11 , two contact edges  31 ,  32  extending parallel are formed on the inner side of the notches  6  which are mutually associated. The first and second contact edges  31 ,  32  increase the contactability, so the electric and thermal resistance is reduced on connection of a contact pin. The contact edges may be produced by an indent, a bead or other means.  
         [0033]      FIG. 9  shows a detail of a further embodiment of the plug contact in which the notches  6  comprise a cruciform slot  26 . A plurality of contact edges are thus formed on the inner sides of the notches  6 . The electric and thermal contact is further improved thereby.  
         [0034]      FIG. 10  shows a printed circuit board  27  with the plug contact and a contact pin  28  guided through the printed circuit board  27  and arranged in the contact region  29  of the plug contact and which is contacted with the plug contact via the clamping force of the contact plates.  
         [0035]      FIG. 11  shows a further contact situation in which the contact plug  28  is inserted from the front into the contact region  29  and fixed between the contact plates  2 ,  3 .  
         [0036]     The contact plug is, in an exemplary embodiment, produced from a metal plate in which a basic shape of the contact plug is punched out in a punching operation. The basic shape is then brought into the corresponding shape of the contact plug by a stamping and bending operation.