CONNECTION HEAD PIECE FOR CONTACTING AN INSULATED DISCHARGE LINE IN EXTERNAL LIGHTNING PROTECTION

Abstract

The invention relates to a connection head piece for contacting an insulated down conductor in the external lightning protection, comprising a sleeve having an axially extending first inner diameter section adjusted to the outer diameter or cross-section of the insulated down conductor for receiving one end of the insulated down conductor, and having a second inner diameter section extending axially adjacent thereto and adjusted to the outer diameter or cross-section of a stripped, exposed conductor end of the insulated down conductor, and means for fastening the stripped, exposed conductor end in the second inner diameter section. According to the invention, a static friction-generating means is formed in the first inner diameter section of the sleeve and flexibly projects into the interior of the sleeve such that a nonpositive connection is established between an outer sheath of the insulated down conductor and the sleeve upon insertion of the down conductor.

Claims

1. A connection head piece (2) for contacting an insulated down conductor (1) in the external lightning protection, comprising a sleeve (3) having an axially extending, first inner diameter section (4) adjusted to the outer diameter or cross-section of the insulated down conductor (1) for receiving one end of the insulated down conductor, and having a second inner diameter section (5) extending axially adjacent thereto and adjusted to the outer diameter or cross-section of a stripped, exposed conductor end (6) of the insulated down conductor (1), and means (7) for fastening the stripped, exposed conductor end (6) in the second sleeve section (5), characterized in that a static friction-generating means is formed in the first inner diameter section (4) of the sleeve (3) and flexibly projects into the interior of the sleeve such that a nonpositive fit is established between an outer sheath of the insulated down conductor (1) and the sleeve (3) upon insertion of the down conductor (1).

2. The connection head piece according to claim 1, characterized in that the sleeve (3) has a sleeve wall which includes a recess (10) for receiving a spring element (9) as a static friction-generating means.

3. The connection head piece according to claim 2, characterized in that the spring element (9) is fixed in a clamping manner to or in the recess (10), and in which the spring element (9) is partially displaced into the recess (10) upon insertion of the insulated down conductor (1) into the sleeve (3).

4. The connection head piece according to claim 2, characterized in that the spring element (9) is configured as a leaf spring, the longitudinal extension of the leaf spring (9) running in the axial direction of the sleeve (3).

5. The connection head piece according to claim 2, characterized in that the spring element (9) is adapted to be clipped or to latch into the recess (10).

6. The connection head piece according to claim 2, characterized in that on its long side ends, the spring element (9) has clamp-like projections (11) for engaging around sections of the sleeve wall in the area of the recess (10).

7. The connection head piece according to claim 1, characterized in that the static friction-generating means is formed as a tongue section (12) of a punching of the sleeve jacket, a free tongue end (13) projecting radially in the direction of the sleeve interior.

8. The connection head piece according to claim 7, characterized in that the free tongue end (13; 14) extends in the longitudinal direction, i.e. axially in the first inner diameter section (4) or over an inner peripheral section of the sleeve (3) following the sleeve radius.

9. The connection head piece according to claim 1, characterized in that the clear inner diameter of the first inner diameter section (4) is selected to be slightly larger than the outer diameter of the insulated down conductor (1) to be received.

10. The connection head piece according to claim 1, characterized in that the static friction-generating means is configured in one or several pieces.

11. The connection head piece according to claim 1, characterized in that the spring element (9) is electrically conductive or is made of an insulating material.

12. The connection head piece according to claim 2, characterized in that the recess (10) is configured as an offset of the jacket material of the sleeve (3) or as an opening.

Description

[0036] The invention will be explained in more detail below with reference to example embodiments and with the aid of figures, in which:

[0037] FIG. 1 shows a longitudinal and cross-sectional representation of an example embodiment for a connection head piece with an insulated down conductor received therein which has a stripped conductor section fixed in a second inner diameter section of the sleeve of the connection head piece, and a static friction-generating means formed as a spring element;

[0038] FIG. 2 shows a lateral view, a top view and a perspective representation of a spring element as a static friction-generating means;

[0039] FIG. 3 shows several exemplary front views, longitudinal sectional representations and perspective representations of a connection head piece having a first, axially extending inner diameter section along with a recess for receiving a spring element, as shown in FIG. 2, the diameter specifications representing embodiments of connection head pieces for insulated down conductors having different diameters. Furthermore, the exemplary dimensional specifications clearly show to what extent the clear inner diameter of the first inner diameter section of the sleeve is selected to be slightly larger than the outer diameter of the respective insulated down conductor to be received;

[0040] FIGS. 4 and 5 show perspective representations and detailed representations of a further embodiment for forming a static friction-generating means in the form of a punching of the sleeve material to form a tongue section, wherein a free tongue end projects radially in the direction of the sleeve interior, and according to FIG. 4, the free tongue end extends in the longitudinal direction, i.e. axially in the first inner diameter section, or according to FIG. 5, in which the free tongue end extends over an inner peripheral section of the sleeve, following the sleeve radius.

[0041] The basic structure of an exemplary connection head piece can be seen in the representations according to FIG. 1 or 4 and 5.

[0042] The connection head piece 2 used for making contact with an insulated down conductor 1 consists of a sleeve 3.

[0043] The sleeve 3 has a first, axially extending inner diameter section 4 which is adjusted to the outer diameter or cross-section of the insulated down conductor 1. This first, axially extending inner diameter section 4 receives a corresponding end of the insulated down conductor 1 in the interior thereof.

[0044] Furthermore, the sleeve has a second inner diameter section 5 extending axially adjacent thereto.

[0045] It is adjusted to the outer diameter or the cross-section of a stripped, exposed conductor end 6 of the insulated down conductor 1.

[0046] Furthermore, setscrews 7 are provided, for example, as means for fixing the stripped, exposed conductor end 6 in the second inner diameter section 5.

[0047] A static friction-generating means formed as a spring element 8 is present in the first inner diameter section 4 of the sleeve 3.

[0048] In accordance with the longitudinal sectional representation of FIG. 1, this spring element 8 flexibly projects into the interior of the sleeve such that upon insertion of the down conductor 1, a nonpositive fit is established between an outer sheath there (not shown in detail) of the insulated down conductor 1 and the sleeve 3.

[0049] In this respect, the sleeve wall has a recess 10 in the region of the first inner diameter section 4 for receiving the spring element 8 as the force-generating means.

[0050] The cross-sectional representation of FIG. 1, lower illustration, makes it clear that various positions between essentially 10.00 o'clock and 14.00 o'clock can be selected for the recess including the spring element 8 inserted there. It is in any case decisive that the corresponding end of the insulated down conductor along with the outer jacket thereof comes into intimate electrical contact with the inner jacket of the sleeve or the connection head piece.

[0051] The views according to FIG. 2 show an exemplary spring element 9, here preferably of metallic design.

[0052] This spring element 9 is realized as a leaf spring, the longitudinal extension of the leaf spring running in the axial direction to the sleeve 3 (cf. FIG. 3).

[0053] It is also apparent for a person skilled in the art from the illustrations according to FIG. 3 how the respective spring element 9 is clamp-fixed in the sleeve recess 10 and how the spring element 9 is partially pushed back, i.e. displaced into the recess 10 when introducing or inserting the insulated down conductor into the sleeve.

[0054] The spring element 9 is adapted to be clipped or to latch into the recess 10.

[0055] In this respect, the spring element 9 includes clamp-like projections 11 at the long side ends thereof, which serve to engage around corresponding sections of the sleeve wall in the region of the recess 10.

[0056] In accordance with the representations of FIGS. 4 and 5, the force-generating means may also be formed as a tongue section 12 of a punching of the sleeve material, a free tongue end 13 projecting radially in the direction of the interior of the sleeve.

[0057] The free tongue end 13 may be located in the longitudinal direction, i.e. axially in the first inner diameter section 4 of the sleeve, as clearly shown in FIG. 4.

[0058] Alternatively, it is possible to realize the punching as illustrated in FIG. 5. In this case, the free tongue end 14 extends radially following the sleeve radius into the interior of the first inner diameter section 4 of the sleeve.

[0059] The cross-sectional, longitudinal sectional and perspective views according to FIG. 3 show how the clear inner diameter of the first inner diameter section 4 of the sleeve has to be selected to be slightly larger than the outer diameter of an insulated down conductor of a different diameter (not shown there), and to what extent the spring element shown there is allowed to project into the first inner diameter section of the sleeve such that on the one hand, the insulated down conductor can easily be inserted into the connection head piece without tools and, on the other hand, the necessary static friction-induced nonpositive fit is maintained under all environmental and application conditions.

[0060] As already explained, the spring element 8 may be formed as a leaf spring in one example, the longitudinal extension of such a spring element running in the axial direction of the sleeve 3. Alternatively, it is also possible to design a flexible molded part, for example formed as a wire structure, radially or tangentially with respect to the sleeve 3, the decisive factor finally being that a relevant region of the element flexibly projects into the interior of the sleeve such that upon insertion of the down conductor 1, a corresponding nonpositive fit is established between an outer sheath of the insulated down conductor 1 and the sleeve 3.