Process for an electrical line fixing strain relief

p0001The invention relates to a method for strain relief down an electrical line in a made from insulating housing, which initially electrical contact elements are electrically connected to the conductors of the cable and with which the contact elements then with the end of the line, in which the Head of insulation are enclosed, incorporated into the prefabricated, consisting of two parts and housing are immovably fixed in the same (DE-OS 42 21 238).

p0002If the contact elements are designed as plug contacts, such as pins or sockets formed such housings may be parts of connectors. The housing can, however, also surround the joint between two conduits. "Contact elements" are then the director of secondary lines. To complete a connector mating contacts are plugged, for example, accommodated in the housing plug contacts, which can also be arranged in a housing. When, by connecting two wires whose conductors are for example soldered or welded together. When fitting and during removal of mating contacts acting forces are exerted on the contacts themselves on the one hand and on the other hand line in the axial direction. Such forces can also occur if the junction of two lines is enclosed by the housing, may be charged to the junctions between the conductors and the plug contacts or between the conductors of the two lines and destroyed in the worst case without countermeasures. The electrical connection would be broken and unusable.

p0003In the opening paragraph of the DE-OS 42 21 238 removable procedures which are designed as plug pins contact elements are pressed by affixed to a portion of the housing projections such thereof against the other that they are not axially movable. In addition, designed as a flat-conductor ribbon cable line is stepped bent clamped in a parting line between the two parts of the housing. This arrangement with an associated method has proven itself. It is used with advantage for flat-conductor ribbon cables that bend fairly easily and can pinch between the two housing parts.

p0004The invention has for its object, the initially described method so further develop, that it can be used for any structured lines.

p0005This object is achieved according to the invention in that the end of the line is embedded within the housing in one on the wall of the housing, through which enters the pipe, fitting, bonded with the insulating material of the pipe and solid at room temperature mass.

p0006When using this method, the end of an electrical line can be defined in a simple manner with strain relief in a case without a dimensionally accurate adjustment of housing and management is necessary. It is this only applied to the protruding into the housing end of the line a certain amount of mass that stuck to the line or with the insulating material. The design of the housing and the conduit are arbitrary. It can be used so round and flat cables with any number of conductors or wires. The insulation of the pipe bonded, solid mass adheres to the same. They thus acts as a thickening thereof. Since it also abuts the wall of the housing through which passes the line, each acting on the same pulling force is effectively intercepted so that the line can not be moved in the axial direction. The joints between conductors and contact elements are therefore effectively protected against tensile loads that may be transmitted over the line. this protection is improved even if the mass extends the joints between conductors and contact elements to above. The amount of mass is measured in each case relatively accurately. It is then, for example, ensures that the connected connectors are not covered to the line, but remain free to contact.

p0007Further advantageous embodiments of the invention will become apparent from the dependent claims.

p0008The method of the invention will be explained with reference to the drawings in embodiments.

p0009Show it:<ul><li>Fig. 1 and 2 show sections through two different manufactured using the method according to the invention connector.</li><li>Fig. 3 is a plan view of an open and the connection point of two lines surrounding housing.</li><li>Figure 4 is a section through Figure 3 along the line IV -.. IV.</li></ul>

p0010The connector shown in FIG. 1 has a two parts 1 and 2 housing G plastic. The two parts 1 and 2 of the housing G can be connected, for example by snap elements together or ultrasonically welded together. In the housing an electrical line G 3 is inserted on one side, for example, two wires 4, of which only one can be seen. At the head of the 5 wires 4 pins 6 are connected electrically conductive. This can be done for example by soldering, welding or by crimping. The pins 6 may protrude from the housing G. You are definitely on the line 3 opposite side for attachment of mating contacts accessible.

p0011The end of the line 3 is embedded within the housing G in a mass 7 which is firmly bonded to the insulation of the cable 3 or the wires. 4 The mass 7 is for example a hot melt adhesive. It is also against the wall 8 of the housing G by which the line 3 is introduced into it. Tensile stresses exerted in the axial direction on the line 3 are accordingly caught by the crowd. 7 You can not affect the joints between the conductors 5 and 6 to the connector pins. The pins 6 are attached itself so firmly in the housing G, that they are not also movable in the axial direction. The mass 7 may, as is indicated by dashed lines, also up on the junctions between the conductors 5 and the pins 6 extend. They can rest against the horizontally extending walls of the parts 1 and 2, except on the wall of the eighth

p0012While in Fig. 1 is a linear embodiment of the plug connector is shown from FIG. 2 shows an angled embodiment. The structure of this connector is basically the same as the connector according to Fig. 1. The difference is that the plug pins 6 are angled with respect to the line 3 by 90 °. The line 3 is again secured by the ground 7 to tensile stresses in the housing G. The junctions between the conductors 5 and the pins 6 are relieved of strain accordingly. A load of the pins 6 in the axial direction may be in this case, the connection points to the conductors 5 also not interfere when the pins 6 are mounted in the axial direction with little play in the housing G.

p0013The mass 7 can be introduced, for example, after the closure of the housing G in the same. For this example, the part 1 of the housing have an opening through which the mass is 7 filled in metered quantity. It must thereby be ensured that the mass 7 on the one hand creates definitely against the wall 8 of the housing G. On the other hand, the mass has 7 adhere to a sufficient length with the insulation of the cable 3 or the wires. 4 With a larger amount of the mass 7 extends beyond the junctions between the conductors 5 and the pins 6. In this area, bonded mass 7 with its base.

p0014It is also possible, the material of the mass 7 before the closure of the housing G on at least one of the two parts 1 and 2 to bring in the solid state thereof, ie to deposit in the housing G. This material may be attached, for example in granular or strip form in the housing G. There can be used from a hot melt adhesive also half-shells which abut after sealing the housing to the conduit. The material adheres in all cases on the housing G. It is transferred after closing thereof by external heat briefly in the flowable state, so that it spread out and can clog the arteries 3 or 4 with the insulating material of the cable. Supplying the heat required for this purpose from the outside can be achieved advantageously in that the parts 1 and 2 of the housing G by ultrasonic welded together.

p0015In the resulting heat the material of the mass 7 flows in the required manner and adhered to the line 3 or with the wires. 4

p0016The mass 7 can in particular simultaneously serve in this case, the two parts 1 and 2 of the housing G in addition to connect with each other when almost the entire internal cross-section fills at that end of the housing G thereof.

p0017The method of the invention can, as already mentioned above, be used for wires and housing of any design. In addition to the illustrated in FIGS. 1 and 2 use with round cables, the method advantageously also for strip lines and flat cables can be used, as it is apparent from Figs. 3 and 4. In FIGS. 3 and 4, 1 and 2, no connectors, but the connection point between two electrical conductors, in contrast to FIGS. 9 and 10. Here in the illustrated embodiment, the line 9 is a flat-conductor ribbon cable and the cable 10 is a round-conductor ribbon cable.

p0018The lines 9 and 10 have in the embodiment shown seven conductors. Line 9 has flat conductor 11, while line 10, for example, round stranded 12 has. The number and cross-sectional shape of the lines 9 and 10 are, however, arbitrary. The conductors 11 are embedded in a common insulation, while the conductors 12 are individually insulated. The insulated conductors 12 are combined to form the above-mentioned round conductor ribbon cable as a conduit 10th However, it may also be individual conductors.

p0019The respective conductors 11 and 12 of the lines 9 and 10 are first example soldered together, which should be indicated by the marked as black dots joints. 13 Then both ends of the line to be inserted with the connecting points 13 in the lower part 2 of the housing G. The joints 13 can be made by soldering but also, when the conductor 11 and 12 are already inserted in the lower part of the second The upper part 1 of the housing G is snapped onto the bottom 2 or ultrasonically welded to the same. The mass 7 can be filled in accordance with above, through openings in the upper part 1 in the housing G. It can also be activated by heat (ultrasound), if it was previously attached to at least a portion of the housing G. The mass 7 surrounds here the ends of the leads 9 and 10 and their conductors 11 and 12, including the joints 13, as is apparent from Fig. 4.

p0020At the head of 11 the line 9 3 and 4 also flat conductors can be connected in deviation from the illustration in Fig.. It is also possible, the respective conductors, for example, to weld together when their cross sections allow that. The conductors 12 of the interconnecting cable 10 are also fixed with strain relief in the housing G, so that from there no tensile loads can also be transferred to the connecting points 13 of the conductors 11 and 12. FIG.

p0021As the material of the mass 7 is - as mentioned above - for example, a hot melt adhesive which is solid at room temperature of about 20 ° C and heat is flowing. Such hot melt adhesive bonded to both the insulation of the cable 3 or of the cores 4 and with the walls of the housing G. However, all other suitable materials used that are flowable at heat and fixed definitely by sticking with the insulating the line 3 or 4 wires and connect to the housing G.