MXPA01002010A - Device for electroconductively contacting an electroconductive part of an especiallylongish, for example essentially cylindrical body, for example a tube or a cable - Google Patents

Abstract

The invention relates to a device (2) for electroconductively contacting an electroconductive part (6) of an especially longish, for example essentially cylindrical body, for example a tube or a cable. The device has a base (4) which has a bearing surface (42, 44) for resting on the body to be contacted, and contact elements for producing an electroconductive connection between the body to be contacted (8) and a conductor, for example an earthing cable (20). The inventive device (2) is characterised in that the base (4) has at least one contact projection (40) consisting of electroconductive material which protrudes in a vertical direction to the bearing surface (42, 44) in such a way that it rests on the electroconductive part (6) of the body (8) to be contacted in the assembly position, hereby forming contact elements. The inventive device is economical and easy to produce and assemble.

Description

DEVICE TO CONTACT ELECTRICALLY DRIVER A PART ELECTRICALLY CONDUCTOR OF A BODY IN PARTICULAR LONGITUDINAL, FOR EXAMPLE SUBSTANTIALLY CYLINDRICAL, FOR EXAMPLE A PIPE OR CABLE Description of the invention The invention relates to a device of the type mentioned in the preamble of claim 1 for electrically conductive contacting an external conductor insulated by sections of a coaxial cable. A device of the type under consideration is known from EP 0 744 788 A1. It serves to establish an electrically conductive connection between a pipe or an insulated external conductor of a coaxial cable and a conductor, for example a ground wire. The known device comprises a base body configured as a bracket having a metal part in the form of a ribbon embedded in an elastic material, for example rubber, which in the axial direction of the base body forms sealing skins mutually spaced from one another. The sealing skirts comprise abutment surfaces through which, in the mounting position, the base body abuts the body to be contacted, the sealing skirts sealing against the penetration of air and / or humidity a space formed in the body. Mounting position between the base body and the body to be contacted.

The known device further comprises contact elements for establishing an electrically conductive connection between the body to be contacted and a conductor, for example a ground wire. In the known device the contact elements are formed by an independent intermediate piece in the form of a ribbon of a copper braid, which in the assembly position abuts on one hand with the body to be contacted and on the other hand with the face of the metal part of the base body facing the body to be contacted. The intermediate piece is joined to the base body by means of glue or a welded joint in the form of a point. A disadvantage of the known device lies in that its manufacture is complex and expensive by virtue of the independent intermediate piece that must be attached to the base body in a further operation. Another disadvantage is that by virtue of the point-shaped connection of the intermediate piece to the base body there is a risk that the intermediate piece will run when it is joined to the base body during the manufacture of the device and therefore will not be fixed to the base body in the desired position. This can cause that during the assembly of the device according to the invention the intermediate piece has to be detached from the base body to place it in the desired position. This is complex and raises assembly costs. Under of the joint that is only in the form of a point, there is also the danger that the intermediate piece detaches from the base body and is lost. Before assembly of the known device it is then necessary to provide a new intermediate piece. This is complex and raises both the costs of the material as well as the assembly costs. EP-A-0 466 276 discloses a device for contacting in electrically conductive form an electrically conductive part of a cable comprising a base body with a surface of abutment to abut the body to be contacted, and contact elements to establish an electrically conductive connection between the body to be contacted and a driver. In the device known through the brochure (compare Fig. 5 of the brochure) the contact elements are formed by a thin cutting plate that, to establish an electrically conductive connection between a connecting cable and an electrical conductor housed in an insulation It snaps into the insulation in the radial direction of the cable, so that it cuts into the insulation until an electrically conductive contact is established with the cable conductor. From US-A-3 749 814 an electrically conductive hose having a layer is known. electrically conductive which is housed between an internal radially electrically insulating layer of the hose and an external radially electrically insulating layer of the hose. To provide an electrically conductive connection between the electrically conductive layer of the hose and a connection cable, a screw extends through a radial bore in the outer layer to the electrically conductive layer of the hose. From US-A-2 279 866 a terminal for fastening and landing a metal tube is known. The object of the invention is to specify a device of the type mentioned in the preamble of claim 1, which does not suffer from the disadvantages of the known device, which is therefore simple and inexpensive to manufacture and assemble. This task is solved by the teaching specified in claim 1. The teaching according to the invention moves away from the idea of forming the contact elements to establish an electrically conductive connection between the body to be contacted and a conductor, for example a cable of earth, by means of an intermediate piece joined in a point shape with the base body. Rather it is based on the idea of forming the contact elements through a part of the base body. For this purpose the teaching according to the invention proposes that the base body has at least one contact shoulder of electrically conductive material. In this way, an independent intermediate piece, for example a braided copper ribbon, is no longer required, so that the manufacture of the device according to the invention is simpler and more economical. By virtue of the elastic abutment of the contact shoulder with the electrically conductive part of the body to be contacted, a particularly secure electrical connection is achieved. In addition, the tolerances of the components can be compensated by the elastic abutment of the or each contact shoulder. Since the contact elements are formed by a part of the base body there is no danger of them being lost, as is the case with the known devices. The shape, size and position of the or each contact shoulder can be chosen within wide limits according to the respective requirements. In addition, you can choose within large limits the amount of contact highlights. A refinement of the teaching according to the invention suggests that the or each contact shoulder is formed by a piece intimately joined to the base body. For example, the or each contact shoulder may be formed by a piece of metal sheet that is intimately connects to a metal sheet part of the base body by welding and projects from the base body in the direction of the body to be contacted. By means of the intimate connection of the part forming the contact shoulder with the base body, this part is retained in a captive manner in the base body. By welding, an intimate connection between both parts can be produced in a simple and inexpensive manner, so that the manufacturing costs of the device according to the invention are low. Fundamentally the or each contact shoulder can be constituted of any material that is a good electrical conductor, provided that in the mounting position (the resistance) between the body to be contacted and a conductor electrically conductive connected to the contact shoulder is sufficiently small enough to guarantee that the currents that could arise in each case, for example in the case of a lightning discharge, are derived from the body to be contacted through the ground cable. In order to maintain this resistance to the minimum possible it is advisable that the or each contact shoulder be (n) metallic (s). The electrically conductive connection between the or each contact shoulder and the body to be contacted can be further improved by means of spring elements for put under pre-tension the or each contact shoulder towards the body to be contacted, as suggested by one embodiment. By the corresponding choice of the pretension of the spring elements it is possible to choose within very wide limits, according to the respective requirements, the force with which in the mounting position the or each contact shoulder abuts the body at be contacted Basically the base body can be of substantially rigid configuration. However, a convenient refinement proposes that the basic body be flexible. In the case of this embodiment, the base body adapts to the surface of the body to be contacted by virtue of its flexibility. This also makes it possible to contact very irregular or curved bodies. The bodies to be contacted can have any configuration, for example in the form of a disc, in the form of a rod, bent or curved in any way or tubular with any diameter. A particularly advantageous refinement of the embodiment just mentioned suggests that the or each contact shoulder is formed by a profile formed in the contact element. If the contact element is constituted, for example, by a metal strip, then the metal strip can be stuffed profiles to form the or each contact shoulder. This embodiment is easy and inexpensive to manufacture. The shape and size of the contact shoulder can be chosen within a wide range by means of the corresponding embossing of the metal strip. A refinement of the previously mentioned embodiment proposes that in the mounting position the or each profile is formed by a bulge of convex cross-section, in particular circular according to plan view, in the direction of the body to be contacted or a protruding groove towards the body to be contacted. The contact shoulder can be formed, for example, by embedding in a metal strip a bulge of convex cross-section, in particular circular according to plan view, in the direction of the body to be contacted. In this way, the or each contact shoulder can be configured in a particularly simple manner when manufacturing the device according to the invention. During assembly of the device according to the invention, this contact shoulder first abuts the body to be contacted substantially in the form of a point and then, under elastic deformation, progressively in a more two-dimensional manner, so that an electrically conductive connection is achieved. secure in the desired way. In an analogous way it is possible to embed grooves in any way on the metal strip to form contact protrusions. Due to the fact that in this embodiment the contact lugs are formed by profiles, gaps are avoided in the base body through which air and / or humidity could penetrate from the outside to the contact area in the mounting position. For contacting tubes, the device according to the invention can be formed, for example, exclusively by a metal band clamp on whose face in the assembly position is oriented towards the tube to be contacted, sealing skirts are fastened. Such an embodiment can be manufactured in a particularly simple and inexpensive manner. Another improvement suggests that the or each contact shoulder is formed by a tongue that protrudes towards the face of the base body which in the assembly position is oriented towards the body to be contacted, the tongue or each tongue being conveniently highlighted by embossing of the contact element, as a refinement proposes. This embodiment can also be manufactured in a particularly simple and inexpensive manner. Another improvement suggests that a part of the contact element is pulled out of the base body towards its face which in the mounting position is away from the body to be contacted, or that the contact element is connected in electrically conductive manner to a part exiting on that side of the base body. In the case of this embodiment, the contact element can be contacted externally in the mounting position of the device, for example by connecting a ground cable to the removed part. This facilitates the assembly of the device according to the invention. Conveniently the base body is configured so that in the mounting position it encloses the body to be contacted in the manner of a ring or sleeve. In this embodiment, the base body is retained with special security in the body to be contacted. Conveniently the or each contact shoulder is formed by a radial shoulder. A further development of the previously mentioned embodiment proposes that the or each contact shoulder extends in the direction of the circumference of the base body substantially over the entire length of the base body in that direction. In this way, a large surface contact is achieved with the body to be contacted and thus a secure electrically conductive connection. By the adjoining large area with the body to be contacted the tolerances of the This component negligibly undermines the electrical connection between the device and the body to be contacted. Another refinement suggests that at least two mutually spaced contact protrusions are provided in the direction of the circumference of the base body, which are preferably arranged on a line of the circumference. In this way the body to be contacted is contacted at several points of the circumference. Another particularly convenient refinement suggests forming the base body in a single piece and open in the circumferential direction, and in such a way that it comprises at its free ends bent and bent tongues which can be joined to each other in the assembly position. By virtue of the configuration of a single piece of the base body, the assembly of the device according to the invention is facilitated. By joining the tongues together, the device can be quickly and simply fixed to the body to be contacted. The tongues can be joined in any way to one another, for example by welding them together. However, a convenient refinement suggests that the tongues can be joined to each other by means of a screw-in device or a tightening device. In this way, the assembly of the device according to the invention is further simplified. Also, in the case In this embodiment, the connection of the tabs with one another and thus the connection of the device with the body to be contacted is separable. Therefore, it is possible to use the device according to the invention again. Another embodiment proposes that the base body comprises a part of elastic material, with the face of which in the assembly position is oriented towards the body to be contacted, the contact element is joined. If the base body is configured as a clamp, then the part of elastic material is deformed when the clamp is tightened and by this it puts under pre-tension in the direction to the body to be contacted to the contact element, so that an electrical connection is established particularly safe with the body to be contacted. In the case of the finished embodiment, the part of elastic material can form a coating of the contact element, or the contact element can be embedded at least partially in the elastic material. In order to design the device according to the invention in an optically more favorable form and / or to protect it against environmental influences, it is possible to provide, for example, a thin coating, optionally including color, on the contact element. However, the contact element also It can be coated with elastic material or embedded in it to obtain electrical insulation. According to the respective needs it is possible to choose the elastic material within very wide limits. It is expedient that the elastic material be an elastomer, in particular a thermoplastic elastomer. Such materials are cheap and easy to process. This reduces the manufacturing costs of the device according to the invention. Elastomers can be used at will, for example vulcanized rubber. Thermoplastic elastomers are particularly convenient by virtue of how easy they are to process. A further development proposes that the contact element has connection elements for connecting a conductor, for example a ground cable, so that the conductor can be connected electrically conductively with the contact element which, in the mounting position, abuts the body to be contacted to establish an electrically conductive connection between the driver and the body to be contacted. The connection of a conductor, for example of a ground cable, is facilitated by the connection elements. In the case of the embodiment with the base body configured as a single piece and the tabs, an improvement of the embodiment previously mentioned proposes that the contact element forms tabs or that extends to the tabs, and that in one tongue at least one through hole is formed and in the other tongue at least one threaded hole, which in the assembly position faces the through hole, so that in the mounting position the tabs can be connected to one another and to the conductor, for example a ground wire, by means of at least one screw of electrically conductive material, preferably of metal passing through the through hole and engages in the threaded hole, thus forming the connecting means. This embodiment can be manufactured in a particularly simple manner and can be assembled quickly and therefore economically. The connection of the conductor is effected by connecting the tabs on one side with one another by means of a screw and otherwise connecting the conductor to the tabs in an electrically conductive manner, for example by means of a connection eyelet. Another embodiment proposes that the device comprises sealing elements for sealing against the penetration of air and / or humidity a space that in the mounting position is formed between the body to be contacted and the device. In this embodiment, alterations are reliably avoided on the external surface of the body to be contacted because of the penetration of air and / or moisture into the contact area, and the disturbances that this causes, for example due to the oxidation of the contact surface. A further development of the previously mentioned embodiment proposes that the sealing elements comprise sealing skirts of elastic material mutually spaced apart from each other in the axial direction of the base body, arranged on one face of the base body which in the mounting position is it is oriented towards the body to be contacted, which extend in the direction of the circumference of the base body, preferably substantially along the entire length of the base body in that direction, and that in the mounting position of the device they closely adjoin the external surface of the body to be contacted. In this way a reliable sealing is achieved by contacting elongated bodies, for example substantially cylindrical tubes or cables, by means of the device according to the invention comprising a base body which surrounds that body in the mounting position, and thereby reliably avoids penetration of air and / or moisture into the contact area. Another refinement of the embodiment with the sealing elements and the basic body configured in one piece with the tongues, it proposes that the sealing elements comprise sealing surfaces formed by surfaces of the tongues facing in the mounting position, made of elastic material or between which in the assembly position a body is located. obturator of elastic material, being that in the assembly position the sealing surfaces adjoin hermetically with each other or with the sealing body and in the direction of the circumference of the base body abut hermetic with the sealing skirts. In this way the airtightness is further improved. Another embodiment proposes that the contact element be made of brass and / or special brass and / or low alloy copper. The electrical conductivity of these materials is particularly good, so that the electrical resistance between a conductor, for example a ground wire and the body to be contacted, is low. In the following the invention will be explained in more detail based on the attached drawing, in which embodiments are shown. They show: Fig. 1 in schematic perspective view a first example of embodiment of a device according to the invention in the form of a clamp in the mounting position, Fi'g. 2 an axial section through the device according to Fig. 1, Fig. 3 a schematic view on the internal radial surface of the device according to Fig. 1, Fig. 4 a schematic radial section through the device according to Fig. 1 in the assembly position, FIG. 5 in the same representation as that of FIG. 3 a second embodiment of the device according to the invention, FIG. 6 in the same representation as that of FIG. 4 in FIG. device according to Fig. 5 in the assembly position, Fig. 7 in the same representation as that of Fig. 2 a third embodiment of the device according to the invention, Fig. 8 in the same representation as the of Fig. 4 the device according to Fig. 9. In the figures of the drawing the same reference symbols for the same or similar components are provided. In FIG. 1 there is shown a device 2 according to the invention comprising a flexible base body 4 configured as a clamp, which in the position of The assembly shown in FIG. 1 abuts a conductive part of a body to be contacted, in the exemplary embodiment according to FIG. 1 with an external conductor 6 isolated from a coaxial cable 8, and surrounds it in the manner of a sleeve. In this embodiment, the base body 4 is formed in one piece and opened in the direction of the circumference, and comprises a metal contact element 10 in the form of a tape, at the ends of which angled tongues 12, 14 are configured which adjoin each other in the mounting position. In the tongue 12 through holes 16 are formed and in the tongue 14 threaded holes not recognizable in the drawing, which in the assembly position face the through holes 16, so that in the assembly position the tongues 12, 14 can be joined one with another and with a conductor, for example a ground cable 20 indicated schematically in the drawing with the reference symbol 20, by means of metal screws 18 which pass through the through holes and engage in the threaded holes. The base body 4 further comprises a portion 22 of elastic material, for example an elastomer, in particular a thermoplastic elastomer. From Fig. 2 it can be seen that the part 22 of elastic material forms an external radial surface 24 of the base body 4, and that the contact element 10 is embedded with their axial edges 26, 28 in the elastic material of the part 22. By means of the elastic material of the part 22, sealing skins 30, 32 are formed mutually spaced from one another in the axial direction of the base body 4 as well as in each case other skirts 34, 36 obturators in axial direction outside the skirts 30, 32 obturators on the face 92 of the base body 4 which in the assembly position is oriented towards the body to be contacted, ie in the example of realization on its internal radial surface. Because in the drawing it can not be seen, we clarify here that the sealing skirts 30, 32 as well as the other sealing skirts 34, 36 extend in the direction of the circumference of the base body 4 substantially along the entire length of the body. base body 4 in that direction, and in the mounting position of the device 2 shown in Fig. 1 abut closely the shell of the coaxial cable 8. In the mounting position of the device 2, a space formed between the base body 4 and the coaxial cable 8 to be contacted is sealed against the penetration of air and / or humidity, a space in which a contact zone 38 is located in wherein an electrically conductive connection is established between the device 2 and the external conductor 6 of the coaxial cable 8.

In order to establish an electrically conductive connection between the device 2 and the external conductor 6 of the coaxial cable 8 to be contacted, the device 2 comprises contact bosses of which in FIG. 2 only a contact shoulder with the symbol of contact can be recognized. reference 40. The contact shoulder 40 is formed by a substantially circular profile in the form of a bulge of convex cross-section, in particular circular as seen in plan, in the direction of the coaxial cable 8 contacted. The way of operating the device 2 according to the invention is as follows: To establish an electrically conductive connection between the external conductor 6 of the coaxial cable 8 to be contacted and the ground cable 20, the device 2 is placed around a portion isolated from the coaxial cable 8 and tightened by means of the screws 18. In doing so the base body 4 comes to abut the sheath of the cable 8 coaxial with the abutment surfaces 42, 44 formed by the sealing surfaces of the skirts 30. , 32 shutters. The contact shoulder 40 protrudes in the direction perpendicular to the abutment surfaces 42, 44 both on the abutment surfaces 42, 44, or in a direction towards the coaxial cable 8 in the mounting position symbolized in Fig. 2. by an arrow 46, which in this mounting position comes to abut the external conductor 6 of the coaxial cable 8 protruding in the radial direction and thus establishes an electrically conductive connection between the contact element 10 and the external conductor 6. Due to the fact that the ground cable 20 is connected to the contact element 10 through the screws 18, the desired electrically conductive connection between the ground cable 20 and the external conductor 6 of the coaxial cable 8 is thus established, so that the external conductor 6 is grounded. When the base body 4 is tightened, the contact shoulder 40 is elastically deformed, so that in the mounting position it abuts in an elastically flexible manner the external conductor 6 of the coaxial cable 8. in this way a secure electrical connection is established between the ground cable 20 and the external conductor 6. Due to the fact that the contact shoulder 40 is formed by a part of the base body 4, an independent part, for example an intermediate piece, is no longer required. This simplifies the structure of the device 2 according to the invention and makes its manufacture more economical. By Fig. 3 showing a view on the internal radial surface of the base body 4 can be appreciate that the contact shoulder 40 and another contact shoulder 48 are each formed by a circular plan profile in the contact element 10. From Fig. 4 showing a schematic radial section through the device 2 it can be seen that in addition to the contact lugs 40, 48 there is another contact lug 50, and that the contact lugs 40, 48, 50 are at equal distance from one another in the direction of the circumference of the base body 4. In FIG. 5 a view is shown on the internal radial surface of a second embodiment of the device 2 according to the invention, which differs from the embodiment according to FIG. 1 in that the contact shoulders are formed by tabs 52, 54 which are highlighted by stamping the contact element 10. From Fig. 6 which shows a radial section through the device according to Fig. 5 it can be seen that in addition to the tongues 52, 54 an additional tongue 56 is provided, the tongues 52, 54, 56 being equally spaced one of the other in the direction of the circumference of the base body 4 and bent towards the face of the base body 4 which in the assembly position is oriented towards the external conductor 6 to be contacted, protruding so much that they abut in an elastically flexible way with the external conductor 6. Fig. 7 shows an axial section through a third embodiment, which differs from the embodiment according to Fig. 6 substantially in that the part 22 of elastic material is arranged spaced apart from the contact element 10 in the region of the groove 58. Fig. 8 shows a radial section through a device 2 according to Fig. 4.

Claims (27)

1. CLAIMS 1. Device for electrically conductive contacting an external conductor insulated by sections of a coaxial cable that protrudes in radial direction with respect to a coaxial cable shell, with a base body configured as a clamp that can be clamped around the coaxial cable, with skirts shutters with which in the mounting position of the device the base body abuts hermetically with the shell of the coaxial cable, and with contact elements to establish an electrically conductive connection between the external conductor of the coaxial cable and a conductor, for example a cable of ground, characterized in that the base body comprises a contact element in the form of a strip of electrically conductive material, because at least one contact shoulder of electrically conductive material formed in one piece with the contact element is formed in the contact element. that in the mounting position of the device protrudes in such a a of the sealing skirts in the radial direction of the coaxial cable that abuts the outer conductor of the coaxial cable and thus forms the contact means, and in that the or each contact shoulder is elastically deformable so that in the mounting position borders with elastic flexibility with the external conductor of the coaxial cable. Device according to claim 1, characterized in that the or each contact shoulder is formed by a part intimately connected to the base body. Device according to claim 1 or 2, characterized in that the or each contact shoulder is made of metal. Device according to any one of the preceding claims, characterized in that the base body has a flexible configuration. Device according to any of the preceding claims, characterized in that the base body has a flexible configuration. Device according to claim 1, characterized in that the or each contact shoulder is configured on the face of the contact element which, in the mounting position, faces towards the body to be contacted. Device according to claim 6, characterized in that the or each contact shoulder is formed by a profile formed in the contact element. Device according to claim 7, characterized in that the or each profile has a convex cross-section in the assembly position, in particular circular according to the plan view, in the direction of the body to be contacted, or a groove that protrudes towards the body to be contacted. Device according to claim 6, characterized in that the or each contact shoulder is formed by a tongue protruding towards the face of the base body which, in the mounting position, faces towards the body to be contacted. Device according to claim 9, characterized in that the or each tongue is protruded from the contact element by stamping. Device according to claim 1, characterized in that a part of the contact element is pulled out of the base body towards its face which, in the mounting position, is remote from the body to be contacted, or which the contact element is connected to. electrically conductive form with a part exiting on that side of the base body. Device according to any one of the preceding claims, characterized in that the base body is configured so that in the mounting position it encloses the body to be contacted, in particular in annular or sleeve form. 13. Device according to claim 1, characterized in that the or each contact shoulder is formed by a radial shoulder. Device according to claim 1, characterized in that the or each contact shoulder extends in the direction of the circumference of the base body substantially over the entire length of the base body in that direction. 15. Device according to claim 1, characterized in that at least two mutually spaced contact bosses are provided in the direction of the circumference of the base body, preferably arranged on a line of the circumference. Device according to claim 1, characterized in that the base body is formed as a single piece and open in the circumferential direction, and comprises at its free ends bent and bent tongues which can be connected to the assembly position in the assembly position. other . Device according to claim 16, characterized in that the tongues can be connected to one another by means of a screw connection or a clamping device. 18. Device according to any of the preceding claims, characterized in that the The base body comprises a portion of elastic material, with the face of which, in the assembly position, faces towards the body to be contacted, the contact element is joined. Device according to claim 18, characterized in that the portion of elastic material forms a covering of the contact element, or that the contact element is at least partially embedded in the elastic material. Device according to claim 18 or 19, characterized in that the elastic material is an elastomer, in particular a thermoplastic elastomer. Device according to any one of the preceding claims, characterized in that the contact element has connection elements for connecting a conductor, for example a ground cable, so that the conductor can be connected electrically conductively with the contact element which in the mounting position it abuts the body to be contacted to establish an electrically conductive connection between the driver and the body to be contacted. 22. Device according to any of claims 16 to 21, characterized in that the contact element forms the tabs or extends up to the tabs, and that at least one tab is formed through the piercing and in the other tongue at least one threaded hole, which in the mounting position faces the through hole, so that in the mounting position the tongues are connected to each other and to the conductor, for example a cable ground, by means of at least one screw of electrically conductive material, preferably of metal that passes through the through hole and engages in the threaded hole, thus forming the connection means. Device according to any one of the preceding claims, characterized in that the device comprises sealing elements for sealing against the penetration of air and / or humidity a space which in the mounting position is formed between the body to be contacted and the device. Device according to claim 23, characterized in that the sealing elements comprise sealing skirts of elastic material mutually spaced apart from one another in the axial direction of the base body, arranged on one side of the base body which is in the installed position oriented towards the body to be contacted, which extend in the direction of the circumference of the base body, preferably substantially along the entire length of the base body in that direction, and which in the mounting position of the device closely adjoin the external surface of the body to be contacted. Device according to claim 24, characterized in that the abutment surface of the base body to abut the body to be contacted is formed by sealing surfaces of the sealing skirts. Device according to any one of Claims 23 to 25, characterized in that the sealing elements comprise sealing surfaces formed by surfaces of the tongues which, in the assembled position, face each other, made of elastic material or between which in the mounting position a sealing body of elastic material is found, wherein in the mounting position the sealing surfaces abut one another or with the sealing body and in the direction of the circumference of the base body abut the sealing skirts. Device according to any one of the preceding claims, characterized in that the contact element (s) is / are made of brass and / or special brass and / or low alloy copper.