DE7111362U - Earthing clamp for electrical systems and devices - Google Patents

Description

Earthing terminal for electrical Plants and devices

The innovation relates to a Erdungskiemme for electrical installations and equipment in which a threaded bolt from the outside into the housing wall of the electrical device can be screwed, the one carrying the _v AuBenerdungsdraht chucking clamp.

In the case of the known grounding clamps, the external grounding wire has hitherto been used bent together at its end to form an eyelet and this eyelet is pushed onto the threaded bolt, with when tightening the threaded bolt this external ground wire was clamped between a clamping disc and the outside of the housing. The ring-shaped support resulted a sufficiently large conductive connection at the clamping point. The loop-shaped bending of the outer ground wire is however, in recent times no longer permitted, so that only a bracing of the straight end of the grounding wire can be considered.

For the connection of a straight external earthing wire, it has already been proposed to use a support body as a support for the Wire end to be welded to the outer wall of the housing and the bracing is pressed on by a screw To carry out clamping bracket. A disadvantage of this ground wire connection, however, is that on a finished electrical Device or a system subsequently carried out welding work which are usually undesirable and often cannot be carried out. Loose support bodies

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however, can be bad for the external ground wire use as this support would rotate when the threaded bolt is tightened.

The task of the innovation is to eliminate these disadvantages and to create a grounding terminal that with the simplest Structure is easy to connect and a non-rotatable connection and sufficient electrical conductivity guaranteed at all crossing points.

The solution to this problem is seen in the fact that the threaded bolt consists of two parts that can be screwed into one another, of which the upper part, designed as a standard screw, is the The clamp with the external grounding wire attached to it, which is on the other side at the end face a square head of the lower part surrounded by the clamping bracket, the fastening thread shaft of which with the Housing wall can be screwed, the square head having an eccentric hole for receiving a retaining pin has, which engages in an axially aligned bore in the housing wall.

By dividing the threaded bolt into two parts that can be screwed into one another in connection with the square head of the lower part, a non-twisting support for the straight earthing wire that is easy to manufacture and easy to mount on the housing is created, whereby the wire is perfectly clamped over the square head with the standard screw is guaranteed. The anti-twist protection takes place here in a simple manner via the retaining pin engaging in the housing wall. The earthing terminal can also be unscrewed from electrical devices that are no longer usable and screwed back onto another electrical device at any time.

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In further development of the innovation _f st is at a ground terminal, wherein the Bei'estigungsmutter the threaded bolt located on the inside of the housing wall retaining element i at the same time as adapted for leading to the supply voltage source internal ground wire - proposed on the threaded shank of the lower part in Innern..des Housing to apply an angle bracket, which has a standard screw with clamping bracket for clamping the inner earthing wire on its free angled leg. In this way, external and internal earthing can be connected to one another in a structurally simple manner, it being irrelevant whether the housing is made of conductive or non-conductive material.

Expediently, the leg of the angle bracket resting on the inside of the housing wall has a with a Through hole through the housing wall and the eccentric Hole in the square piece with the same axis for inserting the retaining pin that penetrates all three parts on. As a result, not only the square head but also the angle bracket can be used with the same retaining pin Secure against twisting.

For thick conductive housing walls, it is recommended that this be done with its threaded shaft in a threaded blind hole in the housing wall screwable square piece via a subsequently introduced, the square piece continuous and the housing wall To secure partially penetrating eccentric hole through the retaining pin against twisting and the inner earthing wire separately on an angle bracket with standard screw and clamping bracket to be connected, which is screwed from the inside to the housing wall and also secured by a retaining pin is. This design allows the grounding clamps to be screwed into a threaded blind hole in the housing wall achieve a rotation lock in a simple manner.

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It is also advisable to use all four sides of the square tückes and also the top of the non-tarnishing To provide the leg of the angle bracket with an earthing symbol incorporated into the surface. This will be ausätziüCiie ϋΓΰ'ύϊϊ & αοΰΠχχάβΓ, the uGÜot äUfgQniSvUw would have to be saved.

Further details and advantages of the innovation are explained in more detail with reference to two exemplary embodiments the drawing reveals, namely shows:

1 shows a grounding terminal in side view for thin housing walls,

Flg. 2 the same earthing terminal in a front view of the internal earthing,

Fig. Z> the same earthing terminal in plan view and

Fig. 4 shows another embodiment of the grounding clamp for thick housing walls with external and internal earthing.

The grounding terminal 1 shown in FIGS. 1 to 3 is on the housing wall 2 of an electrical device or attached to an electrical system. The grounding terminal 1 essentially consists of the two that can be screwed into one another Share 3 T-md 4 with the clamp 5 for the external earth connection and c. ^ n consisting of the two legs 6 and 7 angle bracket ^ i with standard screw 8 and clamping bracket 9 for the internal earth connection. The upper part 4 of the divided The threaded bolt is designed as a standard screw and carries the clamping bracket 5 with the locking ring 10. This Standard screw 4 is screwed into a threaded hole in the lower part 3, which is designed as a square head and a threaded pin 11 penetrating the housing wall 2

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owns. With the screw 4 loosened and the clamping bracket 5 raised, the external ground wire can be on one side or the other side of the clamp between the inner surface of the clamp and the end face of the square head and fixed by tightening the standard screw 4 be clamped. The bent ends of the clamping bracket 5 overlap the square head, so that a Slipping out of the wire is avoided and proper guidance of the clamping bracket is guaranteed.

So that when you tighten the screw 4 no twisting of the Square head 3 can occur, this has an eccentric bore 12, which extends through the housing wall 2 and the leg 7 of the angle bracket resting against this wall is extended. In this through hole is a Retaining pin 1} inserted, which secures the housing wall 2 against rotation with the angle bracket 6, 7 and the square head 3 connects.

The attachment of the square head 3 to the housing wall takes place via the threaded shaft 11 by tightening the fastening nut 14 on the inside of the housing. The angle bracket sits on the threaded shaft 11 under the nut 14 6, 7 for the internal earthing and a safety washer 15 With screw 8 loosened and clamp 9 raised, the inner earthing wire is pushed under the clamp and through Tightening the screw 8 fastened. So that the ground wire is also in a position rotated by 90 ° under the clamping bracket 9 can be inserted, has the on the housing wall

2 adjacent legs 7 of the angle bracket two by 900 to each other offset off-center bores 12 for inserting the retaining pin 1}. All four sides of the square piece

3 and also the top of the non-adjacent leg of the angle bracket are provided with an earthing symbol 16 worked into the surface, so that the earthing terminals is easily recognizable for the connection.

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In the embodiment shown in Figure 4, the housing wall 2 is so thick that it cannot be easily penetrated by the threaded pin 11 intended. For the attachment of the inner earthing bracket 6, 7, a special tapped blind hole 18 is made in the wall 2 from the inside of the housing. A further retaining pin 19 is also provided to secure the internal earthing bracket 6, 7. The electrical connection from the internal earth connection 8, 9 to the external earth connection 4, 5 takes place via the electrically conductive housing wall2.

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Claims (4)

BOPPtREUTHER GMBH MANNHEIM-WA LDHOF Pat Ju / sü G 119Ö claims for protection 1.) Erdungskiemme for electrical systems and devices, in which a threaded bolt can be screwed into the housing outer wall of the electrical device, which carries a clamping bracket clamping the external grounding wire, characterized in that the threaded bolt consists of two parts (3, 4) that can be screwed into one another, of which The upper part ( ² O), designed as a standard screw, receives the clamp (i>) with the external grounding wire attached to it, which is supported on the other side on the end face of a square head (3) of the lower part that is encompassed by the clamp, the fastening thread shaft (11) of which with the housing wall (2) can be screwed, the square head having an eccentric bore (12) for receiving a retaining pin (13) which engages in a coaxial bore in the housing wall. 2.) Earthing clamp according to claim 1, in which the fastening nut of the threaded bolt located on the inside of the housing wall also acts as a holding element is formed for the internal grounding wire leading to the supply voltage source, thereby characterized in that on the threaded shaft (11) of the lower part (3) in the interior of the housing (2) Angle bracket (6, 7) is applied, which has a standard screw (8) on its free angled leg (6) Has clamping bracket (9) for clamping the inner earthing wire. 711138218.6.71 / ϋ j5.) Earthing clamp according to claims 1 and 2, d a through characterized in that on the ^ inside of the housing wall (2) rests Leg (7) of the angle bracket one with an inner through hole through the housing wall and the eccentric hole (12) in the square piece (3) axially Hole for inserting the retaining pin that penetrates all three parts (1. 3). 4.) Grounding clamp according to claim 1 for thick conductive housing walls, characterized in that the threaded shaft (ll) in a Threaded blind hole in the housing wall (2) screw-in square piece (jj) via a subsequently introduced, through the square piece and the eccentric bore (12) partially penetrating the housing wall the retaining pin (IJ) is secured against twisting and the inner earthing wire is connected separately to an angle bracket (6, 7) with a standard screw (8) and clamp bracket (9) is screwed from the inside to the housing wall (2) and also by a retaining pin (19) is secured. 5 ·) Earthing clamp according to claims 1 to 4, characterized characterized in that all four sides of the square piece (3) and also the top of the non-adjacent Provide the leg (6) of the angle bracket with an earthing symbol (l6) incorporated into the surface are. 71113β2ιιβ.7!