Abstract:
A terminal strip for interconnecting electrical lines, especially telephone or computer lines, comprising a single row of mutually parallel first conducting elements ( 9 ) placed side by side, each having an insulation-displacement end intended to house a line wire, the insulation-displacement ends of the first conducting elements being oriented towards the upper longitudinal side ( 7 ), and a single row of second mutually parallel conducting elements ( 11 ) placed side by side, each having an insulation-displacement end intended to house a line wire, the insulation-displacement ends of the second conducting elements being oriented towards the lower longitudinal side ( 8 ). These two rows ( 9, 11 ) are in a same plane and are interconnected via respective interruption points which are offset with respect to said common plane.

Description:
[0001]    The present invention relates to a terminal strip for interconnecting electrical lines, especially telephone or computer lines.  
         BACKGROUND OF THE INVENTION  
         [0002]    Documents U.S. Pat. No. 5,388,999, GB-2,310,962, AU-3,263,489 and EP-0,524,115 describe terminal strips.  
           [0003]    In general, terminal strips are mounted on metal fastening rails which often form an earthed support frame. They are mounted in such a way that their lateral faces are in contact or are very close to one another.  
           [0004]    However, the terminal strips of the prior art have a substantial thickness. This results in a decrease in the number of terminal strips that can be mounted on a given length of metal fastening rail. The main drawback of such existing terminal strips is that they are dimensioned in such a way that the capacity of a length of a fastening rail forming a support frame is limited.  
           [0005]    Furthermore, these terminal strips comprise two rows of conducting elements, called “insulation-displacement contacts”, placed side by side, parallel to one another. They each have an insulation-displacement end configured to receive a line wire and they are aligned face-to-face in two rows in the body of the terminal strip. These insulation-displacement contacts are connected to the conductors of the wire or to jumpers. Because of the parallel rows, the input array and output array of the terminal strip are located on the same upper longitudinal side of the terminal strip. This creates a particularly dense connection and entanglement of wires, together with a packet of wires.  
           [0006]    Yet another drawback of the terminal strips of the prior art is that in order to change the connections, access to a terminal strip located in the middle of other terminal strips, when such strips are placed along a metal fastening rail in a group and once the terminal strip has been connected, is difficult.  
           [0007]    U.S. Pat. No. 4,618,204 discloses connection devices, in particular for telecommunication lines, comprising conductor elements arranged side by side parallel to each other, each split at one end in order to receive a line wire, the conductor elements being retained axially between the two assembled parts of an insulating casing and constituting two alignments, rows or arrays arranged in facing relationship in said casing. The split end parts of the plugs are arranged in the direction of the longitudinal side of one of the parts of the casing, on the side opposite the open assembly side of said part of the casing. The longitudinal side of the casing comprises, on the one hand, driving or guiding slots provided opposite the slots of the end parts, transversely with respect to said longitudinal side and opening out on the two side faces adjacent said longitudinal side and on the other hand, access slots, passing through the same longitudinal side of the casing, longitudinally between the two alignments of split end parts of conductor elements.  
           [0008]    However, one drawback with this type of connection device remains its thickness due to the presence of the two rows of conducting elements. Another drawback is that means for stowing the connection wires is missing. Yet another drawback with the connection devices of the prior art is that the input array is not separated from the output array.  
         SUMMARY OF THE INVENTION  
         [0009]    According to the present invention, a terminal strip for interconnecting electrical lines, especially telephone or computer lines, is characterized in that it comprises  
           [0010]    a) a single row of mutually parallel, first conducting elements placed side-by-side, each first conducting element having an insulation-displacement end configured to receive a line wire, that is oriented towards the upper longitudinal side of the terminal strip, and a single row of mutually parallel, second conducting elements placed side-by-side, each second conducting element having an insulation-displacement end configured to receive a line wire, that is oriented towards the lower longitudinal side of the terminal strip;  
           [0011]    b) in that the insulation-displacement ends of the first and second conducting elements all lie within a same plane;  
           [0012]    c) in that the first and second conducting elements are in two parts, and each first conducting element is separated from a second conducting element by a point of interruption; and  
           [0013]    d) in that said point of interruption is offset with respect to the plane defined by the first and second conducting elements.  
           [0014]    Preferably, the first conducting element comprises at least one moveable flexible tab which, when installed in the terminal strip, is positioned on and touches a fixed part of the second conducting element.  
           [0015]    In the upper longitudinal side of the terminal strip, and adjacent to each first conducting element, access holes are preferably provided for the insertion of a conducting test plug or an insulating interrupt plug. The conducting plug or the insulating plug can be inserted through the access hole into the body of the terminal strip and adjacent to the point of interruption such that it can be slipped between the flexible tab and the fixed part.  
           [0016]    The upper and lower longitudinal sides of the terminal strip preferably have a push-in slot for each insulation-displacement end. These slots extend transversely from the upper or lower longitudinal sides, respectively, and extend into the body of the terminal block along one of the lateral face.  
           [0017]    In one particular embodiment, the terminal strip includes lead-in channels molded or formed in, or attached to one of the lateral faces of the terminal block. Preferably, the channels are located on the same lateral face of the terminal block as the push-in slots. Each of the channels curves away from one of the transverse sides towards at least one of the push-in slots, that is to say, towards at least one insulation-displacement contact. The terminal strip may also include a smooth lateral face on the opposite the lateral face having the push-in slots.  
           [0018]    In order to allow it to be fastened to the support frame, the terminal strip preferably includes positioning and fastening means on each of the two transverse sides. These positioning and fastening means may be located on the two transverse sides and near the two upper and lower longitudinal sides. In order to allow the terminal strips to be fastened together, the terminal strip includes interlocking means, located on each of the two lateral faces such that the interlocking means on one face fits into the interlocking means on the other face.  
           [0019]    In a particular embodiment, the terminal strip includes a drain collector near the upper longitudinal side. In order to identify a group of terminal strips mounted on the rail forming the support frame, the last terminal strip of a series of terminal strips positioned on the rail may include a first label holder which also serves to close off the last lead-in channels of the last terminal strip. In order to identify the terminal strips, these may include a second label holder located on their upper longitudinal side. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0020]    The invention will be thoroughly understood from the various advantages and various characteristics which will become apparent from the following description, the non-limiting embodiment, and with reference to the appended schematic drawings in which:  
         [0021]    [0021]FIG. 1 shows a side view of an interconnection terminal strip;  
         [0022]    [0022]FIG. 2 shows another side view of the interconnection terminal strip;  
         [0023]    [0023]FIG. 3 shows a longitudinal top view of the interconnection terminal strip;  
         [0024]    [0024]FIG. 4 shows a transverse view of the interconnection terminal strip;  
         [0025]    [0025]FIG. 5 shows a side view of the interconnection terminal strip mounted on a support frame provided with a cable;  
         [0026]    [0026]FIG. 6 shows a partial side view, with a cut-away in cross section, of part of the interconnection terminal strip;  
         [0027]    [0027]FIG. 7A shows a cross section of the interconnection terminal strip on the line VII-VII in FIG. 2;  
         [0028]    [0028]FIG. 7B shows the cross section of  7 A with a test plug ready to be inserted;  
         [0029]    [0029]FIG. 7C shows the cross section of  7 A and  7 B with the test plug fully inserted; and  
         [0030]    [0030]FIG. 8 shows various transverse views with a cut-away of a rail forming a support frame provided with interconnection terminal strips. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0031]    A multicontact interconnection terminal strip  1  has two lateral faces  2 ,  3  of a overall rectangular shape, a left transverse side  4 , a right transverse side  6 , an upper longitudinal side  7  and a lower longitudinal side  8 .  
         [0032]    The upper longitudinal side  7  has a row of upper metal insulation-displacement contacts  9 . The lower longitudinal side  8  has a row of lower metal insulation-displacement contacts  11 . These insulation-displacement contacts  9 ,  11  lie within the same plane P. This plane P is parallel to the two lateral faces  2 ,  3 . The upper and lower insulation-displacement contacts  9 ,  11  each include a slot  12  for the insertion of a line wire. These insertion slots  12  always face push-in slots  13  made in the body of the terminal strip. The push-in slots  13  are made in one of the lateral faces  3  of the terminal strip. The push-in slots  13  extend upwards in the case of those associated with the upper contacts  9  and downwards in the case of those associated with the lower contacts  11 .  
         [0033]    The upper contacts  9  are physically separate from the lower contacts  11 . The upper contacts  9  each have a flexible tongue  14  located at their end on the opposite side from the insulation-displacement end. The lower contacts  11  each have a rigid or fixed part  16  located at their end on the opposite side from the insulation-displacement end. This flexible tongue  14  and this fixed part  16  will touch each other and thus form a point of contact and of interruption  17 .  
         [0034]    The rest position of the flexible tongue  14  of the upper insulation-displacement contacts  9  is offset from the plane P defined by the upper  9  and lower  11  contacts. The fixed part  16  of the lower contact  11  is also offset with respect to the plane P defined by these upper and lower contacts  9 ,  11 . This means that the point of interruption is offset with respect to this same plane P.  
         [0035]    Provided, in the terminal strip  1 , for each of the upper insulation-displacement contacts  9  is an upper hole  18  intended for the insertion of a plug  19 . This plug (see more particularly FIGS. 7B and 7C) can be inserted into the terminal strip (in the direction of the arrow T) up to the point of interruption  17  between the flexible tongue  14  of the insulation-displacement contact  9  and the fixed part  16  of the lower insulation-displacement contact  11 . FIG. 7A clearly shows the two possible positions of the flexible tongue  14 , the position of the tongue shown along the plane P being that in which the flexible tongue  14  is forced to move away from its rest position when the plug  19  is inserted. The plug  19  is inserted by moving it parallel (along the arrow T) to the longitudinal axis of the upper and lower insulation-displacement contacts  9  and  11 , and thus also parallel to the plane P.  
         [0036]    Two types of test plug  19  can be used. Insulating test plugs can be used to make an interruption between the upper contact  9  and the lower contact  11 . Conducting test plugs can be used to measure and test the state and quality of the conducting lines connected to the terminal strip.  
         [0037]    In order to connect an input array, a longitudinal channel  21  is provided beneath the push-in slots  13 , this channel being designed to lead in the line wires by an insertion of the same. The channel  21  is bounded in its upper part by a rib  22 . In its lower part, the channel is bounded by a comb  23 . If, as depicted in the drawings, there are 16 lower insulation-displacement contacts  11 , then 16 wires will pass through a ring  24  and be “combed” by the 16 interstices lying between the tines defining the comb  23 . By a better grip of the wire, this allows the mechanical strength and a better conductivity of the lower insulation-displacement contacts  11 , and also the conditions of connecting to be improved. Each of the wires is connected right opposite each of the push-in slots  13 .  
         [0038]    In order to connect an output array, the same lateral face  3  includes a series of lead-in channels  26 . Each of the lead-in channels  26  extend from the transverse side  4  as far as a push-in slot  13  for an upper insulation-displacement contact  9 . If 16 upper insulation-displacement contacts  9  are provided (as depicted in the drawings), then 16 lead-in channels  26  will be located on the lateral face  8 . Preferably, the lead-in channels  26  will form a substantially rounded bend to avoid sharp bend in the wires that will pass through the lead-in channels  26 . The lead-in channels  26  permit real ordering of the connection wires, thus conserving space.  
         [0039]    A completely flat plate  27  has been provided on the other lateral face  2 . When the interconnection terminal strip is inserted on a rail forming a support frame  28 , the plate  27  of one of the terminal strips closes off the lead-in channels  26  of the previous terminal strip, and so on until the end of the rail. At the end, in order to close off the open lead-in channels  26  of the last terminal strip, either a piece which also forms a label holder  29 , or a simple plate, has been provided.  
         [0040]    A cable with an insulating jacket and its line wires  30  is advantageously positioned at the bottom of the U-shaped rail forming the support frame  28 .  
         [0041]    In order to be able to fasten the interconnection terminal strip to the rail forming the support frame  28  having the shape of a U with two upwardly extending side arms  31 ,  32 , two insertion and fastening means are provided on each side of the terminal strip. These means are in the form of a jamb  33  attached at its center to each of the transverse sides, namely the left side  4  and the right side  6 . These two jambs  33  thus define four slots  34  into which the two side arms  31 ,  32  of the rail  28  may be inserted.  
         [0042]    The jambs  33  include a catch  36  which projects inside the slot  34  and is intended to engage with openings  37  present in the side arms  31 ,  32  of the rail  28 . Two of the slots  34  extend upwards along the transverse side of the terminal strip and open to the upper longitudinal side  7 , whereas the other two slots  34  extend downwards along the transverse side of the terminal strip and open to the lower longitudinal side  8 . The two jambs  33  lying on each side of the terminal strip also each include two gripping hooks  38  intended to move the jambs  33  apart on the transverse side in question, and to widen the slots  34 , so as to allow the two side arms  31 ,  32  of the rail forming a support frame  28  to be inserted, and also extracted after having disengaged the catches  36 .  
         [0043]    The operator thus wires up the terminal strip by firstly mounting the terminal strip on the rail forming the support frame  28 , presenting the lower longitudinal side  8  upwards and inserting the line wires into the lower insulation-displacement contacts  11 . Next, the operator releases the terminal strip and turns it upside down in order to fit it again on the rail forming the support frame  28 , so as to be able to insert the line wires into the upper insulation-displacement contacts  9 , the upper longitudinal side  7  then being oriented upwards.  
         [0044]    As may be specifically seen in FIGS. 5 and 8, the rail having a U-shaped cross section forming the support frame  28  can have an unsymmetrical shape with one of the side arms  31  having a greater length than the other side arm  32 . This means that the slot  34  on one side of the terminal strip can be deeper than the slot  34  on the other side of the terminal strip. Having slots of different depths improves the mechanical stability of the terminal strip  1 .  
         [0045]    If, for example, 32 terminal strips are fitted onto a rail  28  having a given length, other means intended to fasten the terminal strips together have been provided. These means are in the form of dovetail-shaped tenons  39  (FIG. 3) protruding a few millimeters over the height of the lateral face  3  on which the lead-in channels  26  are provided. These tenons  39  mate with mortices  41  in the form of grooves running over the entire height of the terminal strip from the side having the lateral face  2  with the flat plate  27 . This really allows the terminal strips to be bonded together, to place the maximum number of them on a rail  28 , to efficiently close off the lead-in channels  26  with the flat plate  27  of the directly juxtaposed terminal strip and to provide excellent mutual mechanical cohesion of the terminal strips.  
         [0046]    In order to improve the screening of the connections, a drain collector has been provided in the form of a metal tongue  42  (FIG. 6) which will bear on an insulating upright  43  of the body of the terminal strip. This allows the drain wires to be gathered together to provide their earth connection through the support frame  28 .  
         [0047]    Provision has also been made for the possible insertion into the upper insulation-displacement contacts  9  of a plug  44  of a jumper (FIG. 8) making it possible to make a cross-connection within a telephone, computer or other distribution frame.  
         [0048]    To be able to recognize the various terminal strips among themselves, a label holder  46  has been provided on the upper longitudinal side  7 . This label holder  46  is used either to slide on individual labels for each of the terminal strips or to slide on only a single long label, when all the terminal strips are closely juxtaposed alongside one another.  
         [0049]    The present invention is not limited to the embodiment described and illustrated. Many modifications may be made without thereby departing from the context defined by the scope of the set of claims.