SU1739425A1 - Earthing clamp - Google Patents

Abstract

Use: construction of clamps when connecting the grounding device to pipelines and conductors in cable technology. SUMMARY OF THE INVENTION: The grounding clip comprises a collar with inward-curved ends, a C-shaped bracket, a bolt, a backing plate, and a grounding conductor with a terminal. The sides of the clamp are made with projections. In the bottom part of the clamp is made arcuate protrusion. The ends of the homogen and the sides of the C-shaped bracket are made with holes for the passage of the bolt. In the base plate there is a bolt seat. 10 il.

Description

The invention relates to electrical engineering, namely, to designs of clips used as a grounding device when connected to pipelines or to conductors in cable technology.

A grounding clip is known, which contains a band ring collar, which encloses a pipe that is tightened by means of a screwdriver, and an attachment point for the grounding conductor 1.

This clamp does not provide sufficient clamping force of the contact element, which is also the grounding conductor attachment unit, due to the large friction losses in the band clamp. In addition, clamping a round cross-sectional grounding conductor does not provide sufficient electrical contact resistance, which reduces the reliability and stability of the structure as a whole.

The closest in technical essence to the present invention is a grounding clip comprising a collar intended for covering a grounded conduit, the free ends of which are bent inward, a tension and fixing node of the collar, and a grounding conductor with end fitting 2.

However, the contact of the collar with the pipe is provided by three connecting elements, the teeth of which provide local connection to the surface of the pipe.

The stability of the electrical contact is not ensured, since the tension of the screw device weakens over time due to the elastic-plastic properties of the screw and the holes in the clamp. The installation of the clamp is considerable in terms of laboriousness, since it requires tightening of four screws.

The insertion of contact elements into the pipe material is carried out by pressing

cl

with

VJ s th

К to) SL

through the clamp along the normal to the surface of the pipe, which does not allow penetration into the thickness of the material deeper than the surface coating (paint, oxide film), since for this it lacks the movement of the cutting edges tangentially to the side surface.

The purpose of the invention is to increase the reliability and stability of the contact connection.

The goal is achieved by the fact that in a grounding clamp containing a collar designed to cover a grounded conduit, the free ends of which are bent inward, the tension and fixing unit of the collar and the grounding conductor with an end fitting, the collar is made with bent protrusions on the side surfaces and an arc-like bend inward in the lower part, the tensioning and fixing unit of the clamp is made in the form of a bolt, a support plate with a bolt seat in its upper part and a C-shaped bracket and is designed for installation on a grounded pipe The conductor is diametrically opposed to the arcuate bend of the clamp in the lower part, the free ends of the clamp and the end fitting of the grounding conductor are located in the cavity of the C-shaped bracket, and the lateral sides of the C-shaped bracket and the free ends of the clamp are provided with holes for the passage of bolts.

Figure 1 shows the clamp, cross section; 2 is a section A-A in FIG. one; Fig. 3 is a section B-B in Fig. 1, in Fig. 4 - a clamp, general view, frontal projection; figure 5 - section bb In figure 4; figure 6 - clamp; figure 7 is a view of D in figure 6: in figure 8 is a section dD in figure 6; Fig.9 is a view of E in Fig.4; Fig. 10 is a diagram of the mounting of the clip on a grounded pipeline and the connection of the grounding conductor to the apparatus.

The grounding clamp comprises a collar 1, a C-shaped bracket 2, a bolt 3, a support plate 4, a metal conductor 5 of grounding with a socket 6. The collar 1 is made of metal, for example, a steel strip with elastic deformation (spring properties), and with inward-facing free ends 7 and 8. The side surfaces of the clamp 1 are symmetrically and oppositely bent at a predetermined angle inward to form the projections 9. In the lower part of the clamp an arc-like bend 10 is made, which acts as a compensator. The ends 7 and 8 of the collar 1 are located in the cavity of the C-shaped bracket 2 and they are made with coaxial through holes 11. and the sides of the bracket

2 are made with through threaded holes 12 for the passage of the bolt 3. The support plate 4 with its concave part rests on a grounded conduit 13, and on its

5 to the convex side, a socket 14 is made to mate with a bolt 3 In the housing of the electrical apparatus 15, a hole 16 is made for introducing a grounded conduit 13 and a hole for a grounding screw 17.

10 The device operates as follows.

Before entering the grounded pipe 13 into the hole 16 of the housing of the electrical apparatus 15 (magnetic starter,

15, a distribution board, etc.) a clamp 1 is put on it, a support plate 4 is installed under the end of the bolt 3, and the end fitting 6 of the ground conductor 5 is attached to the end 7 of the clamp. When screwing

20 of the bolt 3, its end face will rotate in the seat 14 of the support plate 4 and hrmut 1 will begin to tension. In this case, the protrusions 9 tightly cover the surface of the pipeline 13. With further screwing in the bolt 3 due to

25 of the choice of compensator 10, the sharp edges of the protrusions 9 as a result of the action of the friction forces will penetrate the surface of the pipeline both circumferentially and axially (due to the deformation of the collar 1 and the protrusions 9), which

30 will provide a reliable electrical contact between the pipe 13 and the collar 1. The end fitting 6 will be tightly clamped between the end 7 of the collar and the clip 2, which will also provide a reliable electrical contact

35 between the collar 1 and the ground conductor 5. The second end fitting 6 of the ground conductor 5 is sufficient to be connected under the grounding screw 17 of the housing of the electrical apparatus 15, and it will be reliably

40 grounded through conduit 13.

The design of the proposed grounding clip provides increased reliability of the contact connection between the pipeline and the grounding conductor, since a sufficient amount of transient resistance is ensured by the penetration of the collar protrusions through the surface films and coating the mass of the pipeline material during the bolt tightening process with a large force ensuring the cutting of the material . The stability of the contact is provided by the spring properties of the arcuate protrusion in the clamp.

55 In addition, the clamping design provides ease of installation due to the possibility of installing it at the end of the pipeline and at any part of it due to the split design of the pipe covering the pipe. Simplicity of design

consists in the minimum number of parts, their low cost and manufacturability.

Claims (1)

Claims An earthing clamp comprising a collar intended to cover a grounded conduit, the free ends of which are bent inward, a tension assembly and fixing the collar, and a grounding conductor with a terminal, characterized in that. In order to increase the reliability and stability of the contact joint, the clamp is made with bent protrusions on the side the outward surfaces and an arcuate bend inwardly in the lower part, the tensioning and fixing unit is in the form of a bolt, a support plate with a bolt seat in its upper part and a C-shaped bracket and is designed to be installed on a grounded pipeline diametrically opposed to the arcuate bend of the yoke in the lower part parts, the free ends of the clamp and the end fitting of the grounding conductor are placed in the cavity of the C-shaped bracket, and the sides of the Corresponding bracket and the free ends of the clamp are provided with openings for the passage of the bolt. 1 13 Aa % Vb Yig.Ј Rig.Z FIG. b in-in FIG 5 Type G eleven /. / 3 Rig., 1 u I I to. I the form 13 v to.3 TTTP /five