Abstract:
A bayonet type electronic connector ( 1 ) comprises metal contacts arranged on the upper and lower surfaces of the connector ( 1 ). Metal contacts all are U-shaped bayonets ( 2 ). The U-shaped bayonet&#39;s terminal forms a right angle. The adjacent U-shaped bayonets ( 2 ) on each surface are staggered fore and aft in two rows. Enough functional space is arranged between the two rows.

Description:
RELATED APPLICATIONS 
       [0001]    This application is a co-pending application, which claims priority to PCT Application No. PCT/CN2009/000330 filed Mar. 27, 2009, which are herein incorporated by reference. 
     
    
     BACKGROUND 
       [0002]    1. Field of Invention 
         [0003]    The present invention relates to fields of household audio-visual appliance and industrial electrical equipment. More particularly, the present invention relates to a bayonet type electronic connector. 
         [0004]    2. Description of Related Art 
         [0005]    In the fields of household audio-visual appliance, computer, industrial electrical equipment etc., along with the explosive increase of transinformation amount, a multi-contact connector has been more and more widely used, and accordingly the demands for connecting cables among equipments are daily increasing. However, with the miniaturization and micromation of connector contacts as well as the increase in the number of the contacts, a conventional solder-type method faces more and more difficulties in processing cables. The connecting wires fabricated by soldering have the disadvantages of low fabrication efficiency and unstable electrical performance. 
         [0006]    There is a row of parallel soldering points  7  arranged on the tail end of a solder-type multi-contact connector to make a solder connection with the cable conductor, as shown in  FIG. 1 . The conventional soldering method needs a lot of complicated manual operations such as cutting, stripping, positioning, soldering and trimming, and thus has the disadvantages of low efficiency and unstable performance and also becomes a bottleneck that troubles the connector, cable and electronic equipment manufacturers. 
         [0007]    Although there is a U-shaped bayonet type multi-contact connector disclosed in the prior art, such as China Patent No. 1249855A, yet the following defects still exist: 
         [0008]    1. The U-shaped bayonets and the metal contact plates are arranged at 180°, i.e. in a line shape, wherein the adjacent contact plates have to be turned away, thus losing the current balance, causing a sharp increase of the characteristic impedance and producing higher high-frequency attenuation. Therefore, the U-shaped bayonets can only be used in the situation of low frequency; 
         [0009]    2. The U-shaped bayonets are only suitable for clamping ribbon cables; and 
         [0010]    3. The bayonets are distributed on a single side, thus resulting in narrow space. 
       SUMMARY 
       [0011]    In order to solve the aforementioned problems, the present invention discloses a connector for connecting electrical appliances, wherein the soldering points of a conventional solder multi-contact connector are transformed to a distinctive structure with a group of U-shaped bayonets staggered fore and aft in two rows, for clamping and piercing the core wires of the cables and closely contacting the conductors thereof, thereby achieving the purpose of omitting soldering and improving the fabricating efficiency. 
         [0012]    The connector is featured in transforming the conventional parallel soldering points in piercing connection to U-shaped bayonets forming a right angle and staggered fore and aft in two rows, thereby preventing a short circuit from occurring in a narrow space and further ensuring the stability of characteristic impedance. 
         [0013]    Another object of the connector is to facilitate the assembling of the wire and connector, so as to ensure the electrical conduction and mechanical cooperation between the cable conductor and the U-shaped bayonets. 
         [0014]    Specifically speaking, the present invention discloses a bayonet type electronic connector, wherein, the metal contacts on the upper and lower surfaces of the connector are U-shaped bayonets forming a right angle, the adjacent U-shaped bayonets forming a right angle on each surface are is staggered fore and aft in two rows, and enough functional space is arranged between the two rows, thereby overcoming the defect of violent fluctuation of high-frequency characteristic impedance in conventional soldered and general piercing connectors. 
         [0015]    The U-shaped bayonet forming a right angle and the metal contact are the two ends of one piece of contact body, wherein the tail ends of the U-shaped bayonets are open with narrow slots for piercing the cable insulations and closely contacting the cable conductors. 
         [0016]    The connector further includes a pair of plastic clips fitting with the U-shaped bayonets, and a group of round through holes through which the wires are allowed to pass are arranged at the middle portion of the plastic clips, thereby simplifying the arrangement of the core wires and ensuring the parallel transmission of electrical signals, and further ensuring the stability of the characteristic impedance of the connector and greatly improving the attenuation of the electrical signals. 
         [0017]    A group of square through holes which correspond to the U-shaped bayonets for tightly pressing the plastic clips, the U-shaped bayonets and the cables are arranged on the plastic clips. 
         [0018]    The plastic clips are additionally provided with multiple recesses each of which has an elongated circular cross-section and used for accommodating an aluminum foil and a ground wire of a high-frequency twisted pair, so as to prevent a short circuit of the aluminum foil and the ground wire of the adjacent twisted pair and to improve the stability of the characteristic impedance of the connector and further to improve the signal attenuation. 
         [0019]    A conventional monolithically-formed plastic insulator is separated into four pieces, thereby greatly reducing the structural complexity and processing difficulty, improving the fabricating efficiency and enhancing the control over the characteristic impedance of the connector. 
         [0020]    A group of protruding flaps is respectively arranged on the two sides of the connector and the clips, for the precise positioning of the connector and wires in an assembling process. 
         [0021]    The present invention also includes a stamping die for factory assembling and an auxiliary external frame for on-site cable installation at a construction site, and optionally includes a metal shielding shell. The aforementioned stamping die, auxiliary external frame and metal shielding shell all fit with the two groups of flaps. 
         [0022]    Two groups of grooves are arranged on the cavity side walls of the lower die of the stamping die to serve as guide rails to fit with the two groups of flaps, and the upper die of the stamping die has protrusions and fits with the lower die of the stamping die through the guide pillars and guide bushes arranged on the upper die, so that the plastic clips are pressed tightly onto the connector, thereby realizing the assembly and conduction between the wires and the U-shaped bayonets. 
         [0023]    The bayonet type electronic connector further includes a metal or plastic external frame, for assembling the clips and the connector; the tail end of the external frame has a bend to confine the clips, and two groups of square holes are arranged on the two sides of the external frame to fit with the flaps of the connector and the clips. 
         [0024]    The bayonet type electronic connector further includes a pair of metal shells, which are assembled with the connector for shielding and meanwhile grasping the cables; two groups of slots are arranged on the two sides of an inner shell of the metal shells, which fit with the flaps of the connector and the clips. 
         [0025]    The bayonet type electronic connector of the present invention enables cable factories and installation workers to use a new processing manner to replace the solder-type processing manner, thus improving the efficiency and meanwhile greatly improving the precision and stability of electrical performance such as the characteristic impedance and improving the signal attenuation. 
         [0026]    The connector is applicable to the connection of a high-definition DVD player, a TV set, a computer host and a display, and other household and industrial electrical appliances. 
         [0027]    Compared with the conventional U-shaped bayonets, the U-shaped bayonet type connector of the present invention enables the adjacent wires and the contact plates to be in a parallel state without twisted current after the wires are assembled, thus ensuring the stability of characteristic impedance and greatly improving high-frequency attenuation. Therefore, the U-shaped bayonet type connector of the present invention is applicable to a high-frequency situation. Moreover, since the present invention uses the clips, the U-shaped bayonet type connector of the present invention can be used not only to clamp the ribbon cables but also to clamp multi-core round cables, and meanwhile, because of the structural design of the clips, the assembly strength of the products can be enhanced. Since the U-shaped bayonets are arranged on the upper and lower surfaces, the problem of narrow space can be resolved and the high-frequency characteristic impedance of the connector also can be ensured. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]    The invention can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
           [0029]      FIG. 1  is a schematic view showing a conventional solder-type multi-contact connector; 
           [0030]      FIG. 2  is a schematic view showing separate parts of the present invention; 
           [0031]      FIG. 3  is a schematic complete view showing detailed separate parts of the present invention; 
           [0032]      FIG. 4  is a schematic view showing an assembly of the present invention; 
           [0033]      FIG. 5  is a schematic structural view showing a clip of the present invention; 
           [0034]      FIG. 6  is a schematic view showing an assembly of the parallel contact plates and wires of a conventional piercing connector; 
           [0035]      FIG. 7  is a schematic view showing the contact plates that form a right angle piercing the wires according to the connector of the present invention; 
           [0036]      FIG. 8  is a schematic view of the structure and functions of an external frame of the present invention; 
           [0037]      FIG. 9  is a schematic view showing the structure and functions of a metal shielding shell of the present invention; and 
           [0038]      FIG. 10  is a schematic view showing the structure and functions of a mating stamping die of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0039]    The present invention changes the metal solder points  7  of a conventional solder-type multi-contact connector to a U-shaped bayonet structure forming a right angle, and the U-shaped bayonets  2  are staggered fore and aft in two rows, so that enough functional space is ensured to prevent a short circuit and the stability of the characteristic impedance of the connector is ensured.  FIGS. 2 and 3  are exploded views of the present invention. 
         [0040]    The present invention is featured in that the monolithically formed plastic insulator of the conventional connector is separated into four pieces with four layers in total, i.e. insulators  12  and  13 , and the metal contact plate assembly  14  is firstly injection over-molded by an insulator  13  (the insulator  13  is plastic) and then inserted into the metal shells  11  to form one piece. This design greatly reduces the structural complexity of the insulator and the processing difficulty in assembling the contact plate assembly  14 , thus improving the fabricating efficiency and enhancing the control over the characteristic impedance of the connector, as shown in  FIG. 3 . 
         [0041]      FIG. 6  is a schematic view showing the connection of a conventional parallel type piercing connector commonly seen in the market. In this structure, the bayonets are linearly in parallel and a large distance is required between every two adjacent bayonets. Otherwise, a short circuit easily occurs, and the wires need to be sharply bent, thus causing the fluctuation of high-frequency characteristic impedance of cables and increasing signal attenuation. 
         [0042]    And the tails of the U-shaped bayonets  2  of the present invention form a right angle, for clamping and piercing the wire  4 . When the narrow slot  21  pierces the insulations of the wire  4 , it closely clamps the conductor  41  at the same time, so as to ensure a close electrical contact, as shown in  FIG. 7 .  FIG. 7  is a schematic view of the U-shaped bayonets clamping and piercing a core wire of the present invention. In the present invention, the U-shaped bayonets  2  are staggered fore and aft in two rows, thereby saving space and avoiding the trouble of a short circuit. Therefore, the wires may be parallel, thereby stabilizing the high-frequency characteristic impedance and improving the signal attenuation. 
         [0043]    In order to achieve the precise and highly efficient assembling of the wire  4  and the connector  1 , the present invention adds a pair of plastic clips  3 , a group of round through holes  6  for a wire to insert arranged thereon, and a group of square through holes  5  closely fitting with the U-shaped bayonets  2  are also arranged. For the aluminum foil Shielded Twisted Pair (STP) of high-frequency digital cables, the clips are particularly designed with multiple recesses  61  each of which has an elongated circular cross-section and is used for accommodating an aluminum foil and a ground wire, thereby not only preventing a short circuit of the adjacent twisted pairs from occurring, but also improving the stability of the characteristic impedance of the connector and further improving the signal attenuation. Please refer to  FIGS. 2 ,  3 ,  4 , and  5 . 
         [0044]    A group of protruding flaps  15  are arranged on the two sides of the connector  1 , and a group of protruding flaps  31  are arranged on the two sides of clips  3 , for precisely positioning the connector  1  and the cable  4  in an assembling process. Protrusions  16  are arranged on the flaps  15 , and the protrusions  16  are closely fitted with the grooves  17  on the insulators  12  and  13 . Please refer to  FIGS. 3 ,  4 ,  8 ,  9 , and  10 . 
         [0045]    The wire group  4  can smoothly pass through the two groups of round through holes  6  on the clips  3  and then a group of square holes  5  on the clips are aligned with the U-shaped bayonets  2  of the connector, and thereafter, by using the processing manner of pressing and fitting the respective parts into one body, the clips  3 , U-shaped bayonets  2  and wire  4  are assembled. In this process, all the U-shaped bayonets  2  pierce the jackets of the corresponding wire  4 , and meanwhile closely clamp the conductor  41  of the wire  4 . Also, the upper and lower clips are closely joined through the tight fit between the pillars  32  and holes  33  (referring to  FIG. 5 ), thereby enabling a stable assembly. For the semi-finished product after assembling, please refer to  FIG. 4 . 
         [0046]    To facilitate the assembling of cable factories, the present invention has a stamping die, wherein two groups of grooves  83  are arranged on the cavity side walls of the lower die  82  to serve as guide rails to fit with the two groups of flaps  15  and  31  of the connector, and protrusions  86  are arranged on its upper die  81  for tightly pressing the clips. The upper die  82  fits with the lower die  82  through the guide pillars  84  and guide bushes  85 , and thus the plastic clips  3  are pressed tightly onto the connector  1 , thereby enabling the assembling and conduction of the wire  4  and U-shaped bayonets  2 . 
         [0047]    To facilitate assembling for on-site cable installation workers, the present invention is optionally provided with a metal or plastic external frame  76 , for assembling the clips  3  and the connector  1 , which can replace the above stamping die. The tail end of the external frame  76  has a bend  79  to confine the clips  3 , and two groups of square holes  77  and  78  are arranged on the two sides of the external frame to fit with the flaps  15  and  31  of the connector  1  and the clips, so as to ensure the assembly strength of the cables and connector. Please refer to  FIG. 8 . 
         [0048]    In order to ensure the electromagnetic shielding effect, the present invention is optionally provided with a pair of metal shells  91  and  92 , which are assembled with the connector  1  for shielding. Meanwhile, the tail ends of the metal shells are stamped for grasping the cables. Two groups of slots  93  are arranged on the two sides of the metal shell  92  to fit with the flaps  15  and  31  of the connector and the clips, so as to ensure the precision and strength of the assembly. The metal shells  91  and  92  are tightly engaged with the square holes  94  through the barb  95 . Please refer to  FIG. 9 . 
         [0049]    After the assembling process described above, the wire  4  is steadily connected with the connector  1 , and then the steps of injection, assembling of the finished product, and testing can be performed. 
       INDUSTRIAL APPLICABILITY 
       [0050]    The bayonet type electronic connector and stamping die of the present invention allow cable factories to use a new processing manner to replace the soldering processing manner, which improves the efficiency and also greatly enhances the precision and stability of electrical performance. 
         [0051]    The connector is applicable to the connection of a high-definition DVD player, a TV set, the host and display of a computer, and other household and industrial electrical appliances.