EP1352451A2

EP1352451A2 - Device for electrically contacting a sectionally insulated external conductor of a coaxial cable

Info

Publication number: EP1352451A2
Application number: EP02708299A
Authority: EP
Inventors: Britta Daume
Original assignee: Daume Patentbesitz GmbH and Co KG
Current assignee: Daume Patentbesitz GmbH and Co KG
Priority date: 2001-01-19
Filing date: 2002-01-17
Publication date: 2003-10-15
Anticipated expiration: 2022-01-17
Also published as: RU2291529C2; AU2002242682A1; WO2002058192A3; WO2002058192A2; RU2003125377A; DE20101067U1; HK1060445A1; US20040048505A1; EP1352451B1; DE50200398D1; BR0206504A; ES2219631T3; US6870107B2; CN2766362Y; ATE265745T1

Abstract

A device for electrically conductively contacting a sectionally stripped outer conductor of a coaxial cable is provided. The device includes a main body that can be clamped about the cable that is to be contacted. In a non-installed position, the main body is open in a circumferential direction to form ends, which are provided with angled-off or bent-away tongues made at least in part metal. In an installed position, sealing surfaces of elastic material are formed on surfaces of the tongues that face one another. In the installed position, the tongues can be interconnected by at least one screw or bolt. The device also includes a mechanism for limiting a screw-in extent of the screws such that a compression of the elastic material of the sealing surfaces is effected in a defined manner when the screws are tightened.

Description

Device for electrically conductive contacting of a stripped outer conductor of a

coaxial cable

The invention relates to a device of the type mentioned in the preamble of claim 1 for the electrically conductive contact of a stripped outer conductor of a coaxial cable. EP 0 744 788 A1 discloses a device of the type in question which has a base body which is designed as a clamp which can be tensioned around the cable to be contacted, which is designed to be open in the circumferential direction and has angled tabs at its ends, on the surfaces of which facing one another in the assembly position, sealing surfaces are formed from elastic material, wherein the tabs can be connected to one another by means of screws in the assembly position of the device. In the known device, the base body has a band-shaped metallic clamp which is embedded in elastic material, a contact surface for a contact element for contacting the stripped region of the coaxial cable being left free on the side facing the body to be contacted.

A disadvantage of the known device is that when the device is mounted on the coaxial cable, the screws for tensioning the base body are tightened excessive force, the elastic material of the sealing surfaces on the tabs is compressed excessively and not defined, so that there is a risk that the elastic material is damaged and the sealing surfaces thereby lose their sealing effect.

The invention has for its object to provide a device of the type mentioned in the preamble of claim 1, which does not have the disadvantage of the known device, in which the risk that the elastic material of the sealing surfaces is excessively compressed when tightening the screws, is reduced.

This object is achieved by the teaching specified in claim 1.

The basic idea of the teaching according to the invention is to provide means for limiting the screwing-in path of the screw in such a way that the elastic material of the sealing surfaces is compressed in a defined manner when the screw is tightened. In this way, the elastic material of the sealing surfaces is reliably prevented from being excessively compressed when the screw is tightened and possibly being damaged in the process. Rather, the compression of the elastic material takes place in a defined manner, wherein the degree of compression can be selected in a simple manner by appropriately dimensioning the means for limiting the screw-in path and thus the maximum possible screw-in path. Due to the means provided according to the invention for limiting the screwing-in path, the installation of the device according to the invention is simplified and can therefore also be carried out easily by untrained personnel. The device according to the invention is simple and thus inexpensive to manufacture and robust in construction.

The means for limiting the screw-in path can be designed in any suitable manner according to the respective requirements, for example in that the thread of the screw ends at an axial distance from its head, so that the screw-in path is limited by the length of the thread.

An extremely advantageous development of the basic idea of the teaching according to the invention provides that the means for limiting the screw-in path are formed by a stop. This embodiment enables the screw-in path to be limited in a particularly simple manner.

According to the respective requirements, the stop can be arranged on the screw, in particular molded onto the screw, or the stop can be arranged on one of the tabs, in particular molded onto one of the tabs. In the embodiments in which the stop is integrally formed on the screw or on one of the tabs, an additional component is not required to form the stop, so that the structure of the device according to the invention is further simplified and more cost-effective.

A further development of the embodiment with the stop molded onto one of the tabs provides that the stop is formed by at least one projection which extends in the axial direction of the screw and which is arranged on the side of a tab facing the head of the screw in the mounting position, such that the head the screw comes to rest on the projection at the end of the screw-in path. In this embodiment, the projection can be formed, for example, by at least one nose or the like formed on the tab. Another development of the teaching according to the invention provides that the stop is formed by a disk or sleeve surrounding the shaft of the screw, which is arranged in the assembly position between the head of the screw and the facing tab. This embodiment has the advantage that standard components can be used both for the screw and for the washer forming the stop, so that the device according to the invention is also designed to be particularly simple and therefore inexpensive to manufacture in this embodiment.

The screw expediently extends in the assembly position of the device through a through hole which is formed in one of the tabs and is screwed into a threaded hole which is formed in the other tab.

If the base body of the device according to the invention consists of thin sheet metal, for example, in order to increase the stability and to achieve a sufficient depth, in particular the threaded hole, it is expedient for the tabs to have reinforcing elements, preferably made of metal, in which the bores are formed.

A further development of the embodiment in which the stop is molded onto the screw provides that the screw has a thread-free area between its head and its threaded end, the diameter of which is larger than the diameter of the thread, such that a Shoulder is formed, the diameter of the through hole in the

Tab corresponds to the diameter of the screw in the area of the shoulder or is larger than this, such that the axial end face of the shoulder in the screw-in position on the surface of the other face facing this tab rests on the tab.

The invention is explained in more detail below with reference to the accompanying drawing, in which exemplary embodiments are shown.

It shows :

1 shows a schematic perspective view of a first exemplary embodiment of the device according to the invention in the form of a

Clamp,

2 shows a view of the radial inner surface of the device according to FIG. 1 without the contact element, Fig. 3 in the same representation as Fig. 2 the

2 with the contact element attached to the base body,

4 shows a section along a line IV-IV through the device according to FIG. 3 in the assembly position,

Fig. 5 in a schematic perspective view

1 in the assembly position,

FIG. 6 is a highly schematic radial section through the device according to FIG. 1 in

Mounting position to illustrate the basic principle of the teaching according to the invention, FIG. 7 is a highly schematic plan view and in section of a reinforcing element provided with a stop, and FIG. 8 shows the same as FIG. 7 a modification of the reinforcing element according to FIG. 7th In the figures of the drawing, identical or corresponding components are provided with the same reference symbols.

In Fig. 1 a first embodiment of a device 2 according to the invention is shown, which has a flexible base body 4 designed as a clamp, which in this embodiment is formed in one piece and open in the circumferential direction and has angled tabs 6, 8 at its free ends, which in Mounting position can be connected to each other in a manner explained in more detail below by screws, not shown in FIG. 1.

The base body 4 has a band-shaped metal part 10 and a part 12 made of elastic material, in the exemplary embodiment an elastomer, in which the metal part 10 is embedded with its axial edges and is thus connected to the part 12 made of elastic material (FIG. 4). The metal part 10 extends in the circumferential direction into the tabs 6, 8 and is reinforced in this area for stabilization with plate-shaped reinforcing elements 5, 7 made of metal, which can be welded to the metal part 10, for example. Threaded bores 9, 11 and through bores 13, 15 are formed in the lug 6, and through bores 13, 15 in the lug 8, in order to accommodate screws not shown in FIG. 1, by means of which the lugs 6, 8 in the assembly position are interconnectable.

From Fig. 1 is not apparent and therefore it is explained here that the mutually facing surfaces of the tabs 6, 8 in the mounting position are provided with an elastic material, for example an elastomer, so that sealing surfaces are formed which seal in the mounting position of the device 2 together issue.

The part 12 made of elastic material forms sealing lips 14, 16 on the side facing a coaxial cable to be contacted and, in this exemplary embodiment, in the axial direction outside of the sealing lips 14, 16 further sealing lips 18, 20. In the mounting position, the base body 4 lies with the sealing lips 14, 16 and the further sealing lips 18, 20 sealingly on an outer surface of the body to be contacted, so that a space formed in the assembly position between the body to be contacted and the base body 4 is sealed against the ingress of air and / or moisture.

The device 2 also has a contact element (not shown in FIG. 1) for establishing an electrically conductive connection with the coaxial cable to be contacted, which in the mounting position on the side of the base body facing the coaxial cable to be contacted, in the exemplary embodiment according to FIG. 1 on one radial inner surface 22 of the base body 4, which forms a holding surface, is held, for example by means of adhesive.

The device 2 also has for adjusting the contact element in the manufacture of the device 2 adjustment aids for the contact element, which are formed in this embodiment by contact edges 28, 30, 32, which are formed on webs 34, 36, 38, which on the sealing lips 14, 16 of the part 12 are formed from elastic material. The webs 34, 36 extend from the axial

Edge 26 of the base body 4 inwards in the axial direction, while the web 38 extends inwards in the axial direction from the opposite axial edge 26, the webs 34, 36 coming along a circumferential line 33. are arranged and the web 38 is arranged on a circumferential line 35 axially offset from the circumferential line 33.

2 shows a view of the radial inner surface 22 of the device 2.

FIG. 3 shows the device 2 with a contact element 40 held thereon, which in this exemplary embodiment consists of electrically conductive graphite and is essentially rectangular in plan view. The contact element 40 is connected to the radial inner surface 22 of the base body 4 by adhesive and thus held thereon.

From Fig. 3 it can be seen that the contact element 40 is in the fastening position shown there with opposite areas of its edge on the contact edges 28, 30, 32 of the webs 34, 36, 38, the centering means for centering the contact element 40 between the opposite form axial edges 24, 26 of the base body 4. The contact edges 28, 30, 32 ensure that the contact element 40 is held on the base body 4 in the desired position, in which its longitudinal sides run essentially parallel to the axial edges 24, 26 of the base body 4, and does not protrude laterally , FIG. 4 shows a section along a line IV-IV in FIG. 3, the device 2 being shown in the assembly position in which the base body 4 with the sealing lips 14, 16 and the further sealing lips 18, 20 on a coaxial cable 42 to be contacted , is present. For contacting a stripped section

Outer conductor 44 of the coaxial cable 42 in a contact area 46, the contact element 40 protrudes radially towards the coaxial cable 42 to such an extent that it bears against a sheathing 48 of the coaxial cable 42. the sealing lips 14, 16 and 18, 20 abuts the stripped outer conductor 44, which springs back in the radial direction and thus establishes an electrically conductive connection to the latter. FIG. 5 shows the device 2 according to FIG. 1 in

Mounting position in which the base body 4 encompasses the coaxial cable 42 to be contacted in a sleeve-like manner. To fasten the device 2 to the coaxial cable 42, the coaxial cable is first stripped in an axial section and then the as

Clamp-shaped base body 4 clamped around the coaxial cable 42 to be contacted by means of screws 50, 52 made of metal, which extend through the through bores 13, 15 formed in the lug 8 and engage in the threaded bores 9, 11 formed in the lug 6.

When tensioning the base body 4, the sealing lips 14, 16 and the further sealing lips 18, 20 seal against the sheathing 48 of the coaxial cable 42, so that they are in the assembly position between the

Seal the coaxial cable 42 and the basic body 4 formed space against the ingress of air and / or moisture. In the circumferential direction of the base body 4, this space is sealed in that the sealing surfaces formed on the tabs 6, 8 come to bear against one another in a sealing manner, the elastic material of the sealing surfaces being compressed.

When tensioning the base body 4, the contact element 40 also comes into contact with the stripped outer conductor 44 of the coaxial cable 42, so that an electrically conductive connection between the outer conductor 44 and the metal part 10 of the base body 4 is established via the contact element 40. Since the metal part 10 extends into the tabs 6, 8, the 3 3 CQ 1 CM 1

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Screw 52, while its threaded end 58 can be screwed into the threaded bore 9.

When the screw 52 is screwed into the threaded bore 9, the tabs 6, 8 are clamped to one another, the elastic material of the sealing surfaces designated by reference numerals 62, 64 in FIG. 6 being compressed. When a maximum screw-in path determined by the axial distance of the axial end face of the shoulder 61 from the free end of the screw 52 is reached, the end face of the shoulder 61 reaches the tab 8 on the side of the reinforcing element 7 facing the tab 6 in a defined manner in the manner of a stop System so that further screwing in of the screw 52 and thus further compression of the elastic material 62, 64 of the sealing surfaces is prevented.

The screw-in path of the screw is limited by the stop, so that the degree of compression of the elastic material is also limited. Excessive compression is thus reliably prevented.

The degree of compression can be selected by the axial distance of the axial end face of the shoulder 61 from the free end 66 of the screw 52. 7 shows a further exemplary embodiment of a stop for limiting the screwing-in path. In this exemplary embodiment, the stop is formed by lugs 68, 70, which are punched out of the reinforcing element 5 and thus molded onto the tab 8. The lugs 68, 70 protrude axially over the reinforcing element in the direction of the head of a screw, not shown.

Deviating from Fig. The tabs 6, 8 are connected with only one screw, so that the tab

Claims

claims

1. Device for electrically conductive contacting of a stripped outer conductor of a coaxial cable,

with a base body designed as a clamp that can be tensioned around the cable to be contacted, is designed to be open in the circumferential direction and has angled or bent tabs at its ends, which are at least partially made of metal and have sealing surfaces made of elastic material on their surfaces facing one another in the assembly position are,

wherein the tabs can be connected to one another in the assembly position by means of at least one screw,

characterized,

that means for limiting the screwing-in path of the screw (50, 52) are provided such that compression of the elastic material (62, 64) of the sealing surfaces takes place in a defined manner when the screw (50, 52) is tightened.

2. Device according to claim 1, characterized in that the means for limiting the screw-in path of the screw (50, 52) have a stop (61; 68, 70; 72).

3. Device according to claim 2, characterized in that the stop (61) on the screw (50, 52) is arranged.

4. Device according to claim 3, characterized in that the stop (61) on the screw (50, 52) is integrally formed.

5. Device according to claim 2, characterized in that the stop (68, 70; 72) is arranged on one of the tabs (6, 8).

6. Device according to claim 5, characterized in that the stop (68, 70) on one of the tabs (6, 8) integrally formed.

7. Device according to claim 6, characterized in that the stop by at least one in the axial direction of the screw (52) extending, on the in the mounting position the head (56) of the screw (52) facing side of a tab arranged projection (68, 70th ) is formed such that the head (56) of the screw comes to rest on the projection (68, 70) at the end of the screw-in path.

8. Device according to claim 2, characterized in that the stop is formed by a disk (72, 52) or sleeve surrounding the shaft of the screw (50, 52) in the mounting position, which in the mounting position between the head (56) of the screw (50, 52 ) and the facing tab (8) is arranged.

9. Device according to claim 1, characterized in that the screw (50, 52) in the mounting position extends through a through hole (13 or 15) which is formed in one of the tabs (8) and is screwed into a threaded bore (9 or 11) which is formed in the other tab (6).

10. The device according to claim 9, characterized in that the tabs have reinforcing elements (5, 7), preferably made of metal, in which the bores (9, 11, 13, 15) are formed.

11. The device according to claim 10, characterized in that the screw (50, 52) between its head (56) and its threaded end has a thread-free area (60) whose diameter is larger than the diameter of the thread, such that a shoulder (61) is formed, the diameter of the through hole (13, 15) in one tab (8) corresponding to or being greater than the diameter of the screw (50, 52) in the region of the shoulder (61), such that the axial end face of the shoulder (61) lies in the screw-in position on the surface of the other tab (6) facing this tab (8).

12. Device according to claim 2, characterized in that at least two screws (50, 52) are provided for connecting the tabs (6, 8) to each other and that each screw (50, 52) is assigned a stop.