HK1060445B - Device for electrically contacting a sectionally insulated external conductor of a coaxial cable - Google Patents

Description

The invention relates to a device of the type described in the general concept of claim 1 for electrically conductive contacting of an insulated external conductor of a coaxial cable.

EP 0 744 788 A1 identifies a device of the type in question which has a base formed as a shell that can be tightened to the cable to be contacted, which is open in circumferential direction and has angled loops at its ends, at the ends of which, in the mounting position, tight surfaces of elastic material are formed, the loops in the mounting position of the device being connected by screws.

The disadvantage of the known device is that when the device is mounted on the coaxial cable, when the screws are pulled with excessive force to tighten the base, the elastic material of the seals on the loops is compressed excessively and undefined, so that there is a risk of damage to the elastic material and the seals lose their sealing effect.

The purpose of the invention is to specify a device of the type described in the general concept of claim 1 which does not have the disadvantage of the known device, i.e. in which the risk of excessive compression of the elastic material of the sealing surfaces is reduced when the screws are tightened.

This problem is solved by the theory given in claim 1.

The basic idea of the theory is to provide a means of limiting the screw's screw-in path in such a way that a defined compression of the elastic material of the sealing surfaces occurs when the screw is tightened, thus reliably preventing the elastic material of the sealing surfaces from being over-compressed and possibly damaged when the screw is tightened.

The means of limiting the screw-in distance provided for in the invention simplify the installation of the device according to the invention and thus allow it to be easily carried out by untrained personnel.

The device according to the invention is simple and therefore cost-effective to manufacture and robust in construction.

The means of limiting the screw thread may be formed in any suitable way according to the requirements, for example by terminating the thread of the screw at an axial distance from its head, so that the screw thread is limited by the length of the thread.

A particularly advantageous development of the basic idea of the theory of the invention is that the means of limiting the screw thread are formed by a bolt.

Depending on the requirements, the cap may be mounted on the screw, in particular, the screw may be mounted on the cap, or the cap may be mounted on one of the bolts, in particular, one of the bolts.

A further development of the design with the bolt mounted on one of the bolts provides that the bolt is formed by at least a protrusion extending axially in the direction of the screw, on the side of a bolt facing the head of the screw in the mounting position, so that the head of the screw reaches the system at the end of the screw path on the protrusion.

A further development of the theory of the invention is that the mounting is made up of a disc or shell surrounding the screw shaft, placed in the mounting position between the screw head and the mounting rod.

It is appropriate to extend the screw in the mounting position of the device through a through hole formed in one of the tubes and to insert it into a threaded hole formed in the other tube.

If the base of the device of the invention is made of, for example, thin sheet metal, it is appropriate, in order to increase stability and to achieve a sufficient depth, in particular of the thread drill, that the bolts have reinforcement elements, preferably of metal, in which the holes are formed.

A further development of the design, in which the bolt is moulded to the screw, provides that the screw has a threadless area between its head and its threaded end, the diameter of which is greater than the diameter of the thread, so that a shoulder is formed, the diameter of the through hole in the load being equal to or greater than the diameter of the screw in the area of the shoulder, so that the axial face of the screw-in-screw shoulder is aligned with the face of the other load facing that load.

The invention is explained in more detail below by means of the accompanying drawing, which shows examples of its implementation.

It shows: Fig. 1in a schematic perspective, a first example of the device according to the invention in the form of a shell,Fig. 2a view of the radial interior surface of the device according to Fig. 1 without the contact element,Fig. 3in the same representation as Fig. 2 the device according to Fig. 2 with a contact element attached to the base,Fig. 4a section along a line IV-IV through the device according to Fig. 3 in the mounting position,Fig. 5in a schematic perspective, the device according to Fig. 1 in the mounting position,Fig. 6th schematizes a radial section through the device according to Fig. 1 in the mounting position of the basic geometrical element of the leather,Fig. 7 in the same representation as in Fig. 7 and 7th in the mounting position,Fig. 8 with a sharpening and transformation of the element according to Fig. 7 and 7th in the mounting position.

The figures in the drawing show the same or corresponding components with the same reference marks.

Figure 1 shows a first example of a device 2 according to the invention, which has a base 4 flexible, shaped like a shell, which in this example is unidirectional and open in circumferential direction, and has at its free ends angled latches 6, 8 which are connected in the mounting position by screws not shown in Figure 1 as explained below.

The base 4 has a band-like metal part 10 and a part 12 of elastic material, in which case an elastomer, in which the metal part 10 is embedded with its axial edges and thus connected to the part 12 of elastic material (Fig. 4). The metal part 10 extends perimeterally to the loops 6, 8 and is reinforced in this area for stabilization with plate-shaped reinforcement elements 5, 7 of metal, which can be welded, for example, with the metal part 10. In weld 6, threaded holes 9, 11 and in weld 8 through holes 13, 15 are formed, which are further explained below for the absorption of loads.

Figure 1 does not show this, and it is therefore explained here that the surfaces of the 6/8-slots facing each other in the mounting position are fitted with an elastic material, e.g. an elastomer, so that tight surfaces are formed which are close together in the mounting position of the device 2.

The part 12 of elastic material forms, in the mounting position, a seal 14, 16 and in this example, 16 additional seals 18, 20 in each direction in the axial direction outside the seals 14, 16 and 20 respectively, on the side facing a coaxial cable to be contacted, so that a space formed in the mounting position between the body to be contacted and the base 4 is sealed against the penetration of air and/or moisture.

The device 2 also has a contact element, not shown in Fig. 1, for making an electrically conductive connection with the coaxial cable to be contacted, which is held in the mounting position on the side of the base facing the coaxial cable to be contacted, i.e. in the example shown in Fig. 1 on a radial inner surface 22 of the base 4 forming a support surface, for example by means of an adhesive.

The device 2 also has, for the adjustment of the contact element in the manufacture of the device 2, adjusting aids for the contact element, formed in this example by attachment angles 28, 30, 32 formed at rails 34, 36, 38 which are moulded to the seal lips 14, 16 of part 12 of elastic material.

The steps 34, 36 extend inwards from the axial edge 26 of the base 4 in an axial direction, while step 38 extends inwards from the opposite axial edge 26 in an axial direction, with steps 34, 36 arranged on a circumference 33 and step 38 arranged on a circumference 35 axially displaced to the circumference 33.

Figure 2 shows a view of the radial interior surface 22 of the device 2.

Fig. 3 shows the device 2 with a contact element 40 attached to it, which in this example is made of electrically conductive graphite and is essentially rectangular in the projection.

It can be seen from Fig. 3 that the contact element 40 is in the mounting position shown there with opposite areas of its edge at the attachments 28, 30, 32 of the platform 34, 36, 38, the centrifuges for centering the contact element 40 between the opposite axial edges 24, 26 of the base 4 and the attachments 28, 30, 32 ensure that the contact element 40 is in the desired position, in which its longitudinal sides are essentially parallel to the axial edges 24, 26 of the base 4 on which the base 4 is held and not overlapping laterally.

Fig. 4 shows a section along a line IV-IV in Fig. 3, wherein the device 2 is shown in the mounting position, where the base 4 with the sealing lips 14, 16 and the additional sealing lips 18, 20 is attached to a coaxial cable 42 to be contacted. To contact a sectionally insulated outer conductor 44 of the coaxial cable 42 in a contact area 46, the contact element 40 is positioned in a radial direction to the coaxial cable 42 so that, when coated with a coating 48 of the coaxial cable 42, the sealing lips 14, 16 and 18, 20 adjacent to the coaxial cable 42 are attached to the radially rebounding insulated outer conductor 44, thus establishing an electrical connection to it.

Fig. 5 shows the device 2 in the mounting position shown in Fig. 1 where the base 4 is muffed around the coaxial cable 42 to be contacted. To attach the device 2 to the coaxial cable 42, the coaxial cable is first isolated in an axial section and then the base 4 formed as a shell is wrapped around the coaxial cable 42 to be contacted by means of metal screws 50, 52 extending through the through holes 13, 15 formed in the coil 8 and interposed into the thread holes 9, 11 formed in the coil 6.

In the case of the base 4 spans, the sealing lips 14, 16 and the other sealing lips 18, 20 are connected to the system by a close connection to the 48 cover of the coaxial cable 42 so that they seal the space formed in the mounting position between the coaxial cable 42 and the base 4 against the penetration of air and/or moisture.

In the case of the base 4 spanners, the contact element 40 is connected to the insulated outer wire 44 of the coaxial cable 42 and to the system, so that an electrically conductive connection is established between the outer wire 44 and the metal part 10 of the base 4 via the contact element 40. Since the metal part 10 extends into the 6, 8 bars, an electrically conductive connection to a conductor, e.g. an earth cable 54 schematically shown in Fig. 5, can be made by means of the screws 50, 52 and 54 by means of the screws 54 and 44.

In order to avoid excessive compression of the elastic material of the sealing surfaces when the screws 50, 52 are tightened, the means of limiting the screw-in distance of the screws 50, 52 are provided according to the invention, which is explained in more detail in Figure 6.

Figure 6 shows a radial section through the device 2 in the mounting position in the area of screw 52 in a highly schematic manner, whereby for reasons of simplification only the metal part 10, the reinforcement elements 5, 7 and the screw 52 are shown, but the other parts of the device 2 are omitted.

As can be seen from Figure 6, screw 52 has a threadless area 60 in the axial direction between its head 56 and its threaded end 58 with a diameter greater than the diameter of the thread, so that a shoulder 61 is formed in the screw direction at the front of the area 60; the screw 50 not identifiable in Figure 6 is formed accordingly.

The diameter of the through hole 13 in the 8th slot is slightly larger than the diameter of the threadless area 60 of the 52nd slot to accommodate the 52nd screw, while its threaded end 58 can be inserted into the 9th slot.

When the screw 52 is bolted into thread drill 9, the bolts 6, 8 are tensioned together, compressing the elastic material of the seals, designated in Fig. 6 by reference numbers 62, 64. When the maximum screw-in distance determined by the axial distance of the axial face of the shoulder 61 from the free end of the screw 52 is reached, the face of the shoulder 61 reaches the side facing bolt 6 of the reinforcement element 7 of the bolt 8 defined to the system according to the type of impact so as to prevent further screw-in of the screw 52 and thus further compression of the elastic material 64 of the sealing.

The impact limits the screw's screw-in distance, so that the amount of compression of the elastic material is also limited, and excessive compression is thus reliably prevented.

The degree of compression is selected by the axial distance of the axial forehead of the shoulder 61 from the free end 66 of the screw 52.

Figure 7 shows another example of a screw-in-screw-off-road termination. In this example the termination is formed by nozzles 68, 70 which are protruded from the reinforcement element 5 and thus moulded to the tube 8.

In contrast to Fig. 6, the connections between the bolts 6, 8 and 6 are made by a single screw, so that the bolt has only one through hole 13; when the bolt is bolted into the thread drill 13, the unscrewed screw, when it reaches a pre-determined screw path by the axial length of the noses 68, 70, is attached to the front face of the nose 68, 70 in the screw direction, thus limiting the screw path and the degree of contraction of the elastic material of the sealing surfaces.

Figure 8 shows a variation of the example shown in Figure 7 in which the bolt is formed by a coaxial disc 72 attached to the unscrew, which can be either fixed or loosely attached to the reinforcement element 7.

Claims (12)

1. Device for electrically conductively contacting a sectionally bared external conductor of a coaxial cable, comprising a basic body constructed as a clip which can be fixed around the cable to be contacted, the basic body being designed so as to be open in the peripheral direction and comprising at its ends bent or turned tabs consisting at least partially of metal and on the faces of which facing one another in the assembled position sealing faces made of elastic material are formed, wherein in the assembled position the tabs can be connected to one another by means of at least one screw, characterised in that means for limiting the screwed-in distance of the screw (50, 52) are provided such that the elastic material (62, 64) of the sealing faces is pressed together in a defined manner when the screw (50, 52) is tightened.
2. Device according to claim 1, characterised in that the means for limiting the screwed-in distance of the screw (50, 52) comprise a stop (61; 68, 70; 72).
3. Device according to claim 2, characterised in that the stop (61) is arranged on the screw (50, 52).
4. Device according to claim 3, characterised in that the stop (61) is formed on the screw (50, 52).
5. Device according to claim 2, characterised in that the stop (68, 70; 72) is arranged on one of the tabs (6, 8).
6. Device according to claim 5, characterised in that the stop (68, 70) is formed on one of the tabs (6, 8).
7. Device according to claim 6, characterised in that the stop is formed by at least one projection (68, 70) extending in the axial direction of the screw (52) and arranged on the side of a tab facing the head (56) of the screw (52) in the assembled position, such that the head (56) of the screw abuts at the end of the screwed-in distance, against the projection (68, 70).
8. Device according to claim 2, characterised in that the stop is formed by a disc (72) or sleeve surrounding the shank of the screw (50, 52) in the assembled position, the disc or sleeve being arranged between the head (56) of the screw (50, 52) and the facing tab (8) in the assembled position.
9. Device according to claim 1, characterised in that in the assembled position the screw (50, 52) extends through a through-hole (13 or 15), which is formed in one of the tabs (8), and is screwed into a tapped hole (9 or 11) formed in the other tab (6).
10. Device according to claim 9, characterised in that the tabs comprise reinforcing elements (5, 7), preferably made of metal, in which the holes (9, 11, 13, 15) are formed.
11. Device according to claim 10, characterised in that between its head (56) and its end provided with a thread, the screw (50, 52) comprises a thread-free region (60), of which the diameter is greater than the diameter of the thread, such that a shoulder (61) is formed, the diameter of the through-hole (13, 15) in the one tab (8) corresponding to the diameter of the screw (50, 52) in the region of the shoulder (61) or being greater than it such that the axial end face of the shoulder (61) rests on the face of the other tab (6) facing this tab (8) in the screwed-in position.
12. Device according to claim 2, characterised in that at least two screws (50, 52) are provided to connect the tabs (6, 8) to one another and in that a stop is associated with each screw (50, 52).