Earthing contact

Abstract

An earthing contact for creating an electrical contact between an earthing cable and a component comprising an electroconductive component surface, comprises an electroconductive contact plate and a fixing element, the contact plate having a first contact surface for placing the contact plate on the component surface, a second contact surface for placing an earthing cable on the contact plate, and a passage for the fixing element, the fixing element comprising a fixing section for fixing the fixing element in the component, a pressure element for pressing the contact plate onto the component surface and a holding section for arranging in the passage of the contact plate, when the pressure element presses the contact plate onto the component surface, the first contact surface being tiltable in relation to the fixing section by a tilting angle of at least 6 when the holding section is arranged in the passage.

Claims

1. A ground contact for making electrical contact between a ground cable and a component with an electrically conductive component surface, comprising an electrically conductive contact plate and a fastening element, wherein the contact plate has a first contact surface for applying the contact plate to the electrically conductive component surface, a second contact surface for applying a ground cable to the electrically conductive contact plate and a passage for the fastening element, wherein the fastening element has a fastening section for fastening the fastening element to the electrically conductive component, a pressure element for pressing the electrically conductive contact plate to the electrically conductive component surface and a holding section for arranging in the passage of the electrically conductive contact plate when the pressure element presses the electrically conductive contact plate to the electrically conductive component surface, wherein the first contact surface is tiltable with respect to the fastening section by a tilt angle of at least 6, when the holding section is arranged in the passage.

2. The ground contact according to claim 1, also having a gasket which is arranged between the pressure element and the electrically conductive contact plate.

3. The ground contact according to claim 1, wherein the fastening element has a fixing section for fixing the ground cable to the second contact surface.

4. The ground contact according to claim 1, wherein the first contact surface is tiltable with respect to the fastening section by a tilt angle of at least 10.

5. The ground contact according to claim 4, wherein the first contact surface is tiltable with respect to the fastening section by a tilt angle of at least 20.

6. The ground contact according to claim 1, wherein the pressure element is rigidly connected to the holding section.

7. The ground contact according to claim 6, wherein the pressure element is configured as a stop shoulder on the holding section.

8. The ground contact according to claim 1, wherein the fastening section is configured as a bolt section for driving into a borehole of the component.

9. The ground contact according to claim 8, wherein the bolt section has a self-forming thread for screwing into the borehole.

10. The ground contact according to claim 1, wherein the passage is configured as a circular cylindrical bore with a bore diameter and a bore length, and the holding section is configured as a circular cylindrical shaft section with a shaft diameter.

11. The ground contact according to claim 10, wherein a ratio of a difference between the bore diameter and the shaft diameter on the one hand, and the bore length on the other hand, amounts to at least 0.05.

12. The ground contact according to claim 11, wherein the ratio of the difference between the bore diameter and the shaft diameter on the one hand, and the bore length on the other hand, amounts to at least 0.1.

13. The ground contact according to claim 12, wherein the ratio of the difference between the bore diameter and the shaft diameter on the one hand, and the bore length on the other hand, amounts to at least 0.2.

14. The ground contact according to claim 1, wherein the holding section is connected rigidly to the fastening section.

15. The ground contact according to claim 14, wherein the first contact surface is connected rigidly with the passage.

16. The ground contact according to claim 14, wherein the first contact surface is tiltable with respect to the fastening section by a tilt angle of at least 10.

17. The ground contact according to claim 14, wherein the passage is configured as a circular cylindrical bore with a bore diameter and a bore length, and the holding section is configured as a circular cylindrical shaft section with a shaft diameter.

18. The ground contact according to claim 1, wherein the first contact surface is connected rigidly with the passage.

19. The ground contact according to claim 18, wherein the first contact surface is tiltable with respect to the fastening section by a tilt angle of at least 10.

20. The ground contact according to claim 18, wherein the passage is configured as a circular cylindrical bore with a bore diameter and a bore length, and the holding section is configured as a circular cylindrical shaft section with a shaft diameter.

Description

DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

(1) Additional advantages, features and particulars of the invention will be revealed by the following description of preferred embodiments and with reference to the drawing; these show, in:

(2) FIG. 1 a ground contact.

DETAILED DESCRIPTION OF THE INVENTION

(3) In FIG. 1 a ground contact 1 is shown for making electrical contact between a ground cable 2 and a component 3 having an electrically conductive component surface 4. The ground contact 1 includes an electrically conductive contact plate 5 with a first contact surface 6 for applying the contact plane 5 in a flat manner on the component surface 4, and a second contact surface 7 for applying the ground cable 2 to the contact plate 5. To this end, the ground cable 2 has a cable lug 8. The ground contact 1 also includes a fastening element 9 with a fastening section 10 for fastening the fastening element 9 to the component 3, a pressure element 11 configured as a stop shoulder, which presses the contact plate 5 to the component surface 4, and a holding section 12, which is arranged in a passage 13 of the contact plate 5. The ground cable 2 has a conductor cross-section of 50 mm.sup.2 or more, 95 mm.sup.2 for example. The first contact surface 6 has a surface area of 250 mm.sup.2 or more, 400 mm.sup.2 for example. The first contact surface 6 and/or the second contact surface 7 are galvanized, hot-dip galvanized for example.

(4) The fastening section 10 is configured as a bolt section for driving into a borehole 17 of the component 3. The fastening section 10 has a self-forming thread 18 for screwing into the borehole 17. In exemplary embodiments not shown, the fastening section is configured as a blunt setting bolt without a threaded section for linear driving into the borehole, or has a screw tip or a nail tip for direction driving into a component without a borehole. Furthermore, the fastening element 9 has a fixing section 14 for fixing the ground cable 2 to the second contact surface 7. The fixing section 14 is provided with an external thread 15 for this purpose, onto which a nut 16 is screwed, which presses the cable lug 8 of the ground cable 2 against the second contact surface 7.

(5) The ground contact 1 also has a gasket which is arranged between the pressure element 11 and the contact plate 5. For sealing the fastening section 10 of the fastening element 9 with respect to the environment, the gasket includes an inner sealing ring 19 made of an elastic material and a cover plate 20 made of a rigid material, for example of a metal or an alloy such as steel. The inner sealing ring 19, the cover plate 20, the sealing plate and/or the pressure element 11 are arranged in a recess 21 of the contact plate 5 provided for that purpose. The ground contact 1 also has an external sealing ring 22, which is so arranged between the contact plate 5 and the component 3, that the first contact surface 6 is sealed with respect to the environment. The electrical contact between the first contact surface 6 and the component surface 4 is thus protected against a sometimes-corrosive effect of the environment by the inner sealing ring 19 on the one hand and by the outer sealing ring 22 on the other hand.

(6) The fastening element 9 is manufactured in one piece from a metal or an alloy such as steel, so that the fixing section 14, the pressure element 11, the holding section 12 and the fastening section 10 are rigidly connected to one another. Likewise, the contact plate 5 is manufactured in one piece from a metal such as copper or an alloy such as steel, so that the first contact surface 6, the second contact surface 7 and the passage 13 are rigidly connected together.

(7) The passage 13 is configured as a circular cylindrical bore with a bore diameter of 6.0 mm and a bore length of 2.0 mm which is equal to the thickness of the contact plate 5 in the area of the passage 13. The holding section 12 is configured as a circular cylindrical shaft section with a shaft diameter of 5.6 mm. The ratio of the difference between the bore diameter and the shaft diameter, namely 0.4 mm, and the bore length, namely 2.0 mm amounts to 0.2. The first contact surface 6 is therefore tiltable with respect to the fastening section 10 by a tilt angle of approximately 11.3 in each direction, i.e. with an overall tilt angle of approximately 22.6. In order to ensure that the first contact surface 6 lies in a flat manner on the component surface 4, it is thus sufficient that the fastening element 9 is fastened to the component 3 at an angle of 9011.3=78.7 or more to the component surface 4.