FR2738959A1 - CONNECTION BOX FOR A DATA NETWORK - Google Patents

Abstract

Connection box for a data network, provided with a box frame (11) and a printed circuit (21) housed therein, which has at least one data socket (22), provided with a collar connection (12) at one end of the box frame (11), which defines a flange plane (13) and provided with an introduction hole (19) in the box frame (11) through which can be introduced the final section of a screened multi-conductor data cable (20), characterized in that the introduction hole (19) is provided in the area of the box frame (11) opposite to the connection collar ( 12) in such a way that the central axis (35) of the final section of the data cable (20) can be introduced into the box frame perpendicular to the plane of the collar (13) and that it can be fixed permanently in this orientation relative to the printed circuit (21).

Description

The invention relates to a connection box for a network of

  data, provided with a box chassis and a printed circuit which is housed therein, which comprises at least one data socket, provided with a connection flange at one end of the box chassis, which defines a flange plane , and provided with an opening for insertion into the box frame through which the final section of a shielded multicore data cable can be introduced. With the connection boxes which existed until now, the data cable is introduced into the chassis of

  the box roughly parallel to the plane of the collar.

  The generally very small lateral volume around the connection box, often imposed by standards, results in very small radii of curvature of the data cable. Several curves are sometimes necessary in order to be able to arrange the data cable in the box, this one

  being placed in the wall in a sheath or cable tray.

  This is particularly the case when mounting the connection box.

  In a recessed box, there is only a narrow slit next to the box in which the cable is, so to speak, trapped. The assembly thus proves to be very inconvenient and the tensioned and jammed data cable exerts significant mechanical stresses on the elements, in particular on the fastenings of the printed circuit and of the chassis of the box. Significant bends in the data cable can also

  break the signal wire.

  The object of the invention is to provide a connection box of the generic type which allows easy mounting,

  low stresses on the elements and greater cleaning-

data cable.

  This object is fulfilled by the fact that the introduction hole is arranged in the area of the box chassis opposite the connection flange so that the central axis of the final section of the data cable can be introduced into the chassis. of box perpendicular to the plane of the collar and that it can be fixed permanently in

  this orientation relative to the printed circuit.

  It has been found that it is easier to arrange space in the bottom of the chassis of the box than on its sides. As a result, the data cable can be easily bent to the side with a large radius. The mechanical bending stresses thus produced are

  weak. The final section fixed in the junction box-

  ment is in a "neutral orientation" with respect to an angled routing of the data cable 21 in all directions. This means that in the case of a lateral bend to the left or right, forwards or backwards, the data cable is always bent according to a

  approximately identical radius and only once.

  According to a second characteristic of the invention, the plane of the printed circuit is perpendicular to the plane of the collar and the final section of the data cable can be fixed by resting directly on a flat side of the printed circuit. The construction in accordance with the above characteristic allows, on the one hand, easy fixing of the data cable, which also makes it possible to optimize the length of each of the

  wires to the connection points of the printed circuit.

  On the other hand, the "vertical" orientation of the printed circuit allows part of it to protrude from the plane of the collar, the chassis of the box thus being able to be smaller. As a result, there is more free space between the

  bottom of a recessed box and the frame of the box.

  According to a third characteristic of the invention, the shield stripped at the final section of the cable

  data can be pressed directly on a conductive track

  leading the ground potential of the printed circuit.

  According to the improvement in accordance with the above characteristic, the ground connection of the shield of the data cable to the printed circuit is also very close to the connection points of the signal wires on the printed circuit, the transfer impedance of the shield being as well

advantageously low.

  According to a fourth characteristic of the invention, the plane of the printed circuit is parallel to the plane of the flange and a fixing bracket is mounted on the printed circuit, the final section of the data cable can be fixed by resting on the side of the angle of it moving away

  perpendicular to the plane of the printed circuit.

  The production in accordance with the above characteristic requires very little modification in the case of a

  traditional connection box, because the "parallel" position

  The "printed circuit board is very common. Such junction boxes are wide but can be made with a lower profile, which can now be used advantageously for the" perpendicular "introduction of the cable. According to a fifth characteristic of the invention, the fixing bracket is electrically conductive, it is connected to a conductive track of the printed circuit conducting the ground potential and the stripped shield of the final section of the data cable can be pressed directly

  against the side of the protruding angle.

  The improvement in accordance with the above characteristic again has a higher shielding transfer impedance

low.

  According to a sixth characteristic of the invention, the

  printed circuit is housed so that it can slide perpetually

  specifically at the plane of the flange relative to the chassis

of the box.

  An implementation in accordance with the characteristic below

  top allows simple adaptation to different mounting conditions while ensuring a reliable connection function, circular guidance and fixing

4 2738959

  can be carried out without problem due to the lower mechanical stresses produced by the

data cable.

  Other advantages and achievements of

  the invention results from the following description

  of exemplary embodiments by means of the drawings.

  These illustrate: Figure 1 a bottom view of a connection box, Figure 2 a cross section in the plane 2- 2 of Figure 1, Figure 3 a cross section corresponding to Figure 2 according to an additional variant. According to Figures 1 and 2, a connection box is provided with a box frame 11 of generally cylindrical or prismatic shape. According to Figure 2, a circular flange 12 is formed on the upper edge. The plane 13 of this flange, in its mounting position, is parallel to a plane of the wall 14 which is illustrated in FIG. 2 by the hatched lower edge of a cover 15. This wall plane 14 here corresponds either to the wall d 'a building, either to the exposed connection wall of a profiled cable tray. The connecting flange 12 can be fixed and rest on the outer edge of a built-in box 16 which is only roughed out, inside which the chassis 11 of the box enters. The other details are not particularly illustrated,

because these are known elements.

  According to use, the frame 11 of the box is provided with a sheath 17 which has an opening 18 towards the plane of the collar 13 and a smaller introduction opening 19 towards the opposite end, its edge being rounded so as not to damage a bending data cable during its bending. A printed circuit 21 whose plane is perpendicular to the plane of the flange 13, preferably also sliding perpendicularly by

2738959

  relative to the plane of the collar 13, is inserted into the sheath 17. The guide grooves suitable for this purpose in the narrow sides of the frame 11 of the box are not shown in particular. Such guide grooves are just as suitable for immobilizing the printed circuit 21. A part (about a third) of the printed circuit 21 protrudes from the sheath 17 above the plane of the flange 13 and enters a central plate 40 carried out under the

shape of a hood.

  The elements located on the printed circuit 21 are not shown in the figures for reasons of good visibility. These are several insulation displacement terminals by means of which the wires of the multi-conductor data cable 20 are connected to the conductive tracks of the printed circuit 21 which, in turn, lead to the lamella contacts of the data socket. 22 which is only shown so

  summary in figure 2. A data socket

  common is, for example, a so-called WESTERN socket (from WesternElectric) or an IBM socket. Two such data sockets are usually arranged next to each other. A first flat side 23 of the printed circuit 21 is arranged essentially parallel and at a short distance from a first inner wall 24 of the sheath 17. The elements mentioned above are found on the

second opposite flat side 25.

  The outer shield 26 returned from the data cable 20 is clamped on the second flat side 25 in the region of the lower edge of the printed circuit 21 against a conductive shielding surface exposed in this

  place. This tightening is exerted by a clamp

  cable 27, which roughly has the shape of a U and which, in the example, is designed so as to cover two data cables 20, 20 'arranged one next to the other. A clamping screw 28 passes between the two data cables 20, 20 ′, its head resting on the first flat side 23 of the circuit

6 2738959

  printed 21 and its thread being screwed into a threaded hole located in the central part of the cable clamping bracket 27. Lugs 31, 32 which penetrate into the holes of the printed circuit 21 are formed on the two outer elbows 29, 30. This allows the cable clamp bracket 27 to be positioned and prevents twisting when tightening the screw. In the case of a multilayer printed circuit, the conductive tracks which conduct the signal are located between the two conductive shielding surfaces, one of them being on the first flat side 23 and the other on the second side. flat 25. The two conductive shielding surfaces are electrically connected to each other. The current protective varnish is removed from a part of the first conductive shielding layer 23, two contact strips 33, 34 which are electrically connected with the chassis 11 of the box can thus rest on the conductive shielding surface and establish a contact with her. It is also possible to provide only one contact strip. Two or more contact strips, however, increase the guarantee that the chassis 11 of the box is automatically set to potential

electrical ground.

  Due to the previously described fixing of the final section of the data cables 20, 20 ′, their central axes 35 are oriented perpendicular to the plane of the flange 13 and are permanently fixed in this position on the printed circuit 21. As As shown in Figure 2, the data cable 20 can be directed in all directions with a single curvature. In reality, the distance between the lower edge of the chassis 11 of the box and the bottom 36 of the built-in box 16 is shown proportionally too small. There is actually more room here, the curvature of the data cable 20 can therefore be less restrictive. The representation according to Figure 2 may give the impression that there is more room on the side, next to the frame 11 of the box, than on the bottom. However, Figure 2 shows only the narrow side. It is however the width between the side walls 37, 38 (FIG. 1) of the chassis ll of the box.

which is decisive.

  The exemplary embodiment of Figure 3 should illustrate the fact that there are also alternative possibilities. In this example, the plane of the printed circuit 39 is parallel to the plane of the flange 13. With this variant, the chassis 41 of the box requires, it is true, a greater width, but therefore a smaller height. An L-shaped fixing bracket 43 is fixed on the lower side 42 of the printed circuit 39, this fixing bracket 43 being in electrical contact with a conductive shielding surface. As in the previous example, the final sections of two data cables 20, 20 ′ are fixed to the side 44 of the angle which moves away perpendicularly relative to the plane of the printed circuit using a clamp. -cable 27 of similar type and a fixing screw 28. Only the side 44 of the angle appears here in place of the printed circuit. The data cables 20, 20 ′ are introduced into the bottom 46 of the chassis 41 of the box through

an introduction opening 45.

  The illustrated clamping device securely holds two data cables like a double lever. But if you only need to connect one data cable, just tighten a section

  about 1 cm in length acting as a counter

support.

$ 2738959

Claims (6)

  1. Junction box for a data network, provided with a box frame (11, 41) and a printed circuit (21, 39) housed therein, which comprises at least one data socket (22) , provided with a connection flange (12) at one end of the box frame (11), which defines a flange plane (13) and provided with an insertion hole (19, 45) in the box frame (11, 41) through which the final section of a shielded multicore data cable (20, 20 ') can be introduced, characterized in that the insertion opening (19, 45) is arranged in the box chassis area (11, 41) opposite the connection flange (12) so that the central axis (35) of the final section of the data cable (20, 20 ') can be introduced into the chassis box perpendicular to the plane of the flange (13) and that it can be permanently fixed in this orientation relative to to the printed circuit (21, 39).   2. Junction box according to claim 1, characterized in that the plane of the printed circuit (21) is perpendicular to the plane of the flange (13) and that the final section of the data cable (20, 20 ') can be fixed by resting directly on a flat side (25) of the printed circuit (21). 3. Junction box according to claim 2, characterized in that the shield (26) stripped at the final section of the data cable (20, 20 ') can be pressed directly onto a conductive track leading to the potential of mass of the printed circuit (21).   4. Junction box according to claim 1, characterized in that the plane of the printed circuit (39) is parallel to the plane of the flange (13) and that a fixing bracket (43) is mounted on the printed circuit (39), the final section of the data cable (20, 20 ') can be fixed in 9 2738959   resting on the side (44) of the angle thereof which recedes perpendicularly relative to the plane of the printed circuit board.   5. Junction box according to claim 4, characterized in that the fixing bracket (43) is electrically conductive, that it is connected to a conductive track of the printed circuit (39) conducting the ground potential and that the stripped shield of the final section of the data cable can be pressed directly against the side (44) of the projecting angle.   6. Junction box according to claim 1, characterized in that the printed circuit (21) is housed so that it can slide perpendicular to the plane of the flange   (13) relative to the chassis (11) of the box.