DE1042059B - Terminal for grounding standardized mounting rails in electrical switchgear - Google Patents

Description

GERMAN

The metallic parts of all devices and switchgear must generally be earthed. A good Earthing requires a greater or lesser effort, so that one does not earth directly everywhere, but carries an earth conductor and connects the earth conductor to the device at the appropriate point. If the conductors of a multi-conductor cable are connected to terminals, the earth conductor must also be connected. In switchgear in which standardized mounting rails are used, there are often several Multi-conductor cables routed side by side to the associated terminals. The earth conductors carried are then appropriately clamped next to the associated conductors of the same cable.

There is now the need to connect earth clamps in a simple way at every point in a row of clamps, namely by attaching it to the mounting rail, without it being necessary to to have to look around for a suitable place on the assembly frame in order to clamp it there by drilling of the earth conductor by means of an eyelet or cable lug. This task is carried out by the Clamp released according to the invention.

This clamp for grounding standardized profile rails, e.g. B. in the execution for the attachment on an asymmetrical mounting rail according to DIN 46 277, which is widely used in switchgear systems, is composed according to the invention of the following clamping parts:

a) a busbar with a preferably rectangular cross-section, one end of which is angled and serves as a support leg on the mounting rail, while the other part on its straight, the terminal point for the end to be connected via the support rail laterally protruding Forms grounding conductor,

b) a counter-bracket supported in the mounting rail, this counter-bracket by means of a screw and the busbar is pressed against the wall of the mounting rail from different sides and the shape of the counter flap is chosen so that it can be put on and clamped the power rail is possible at any point on the mounting rail,

c) a closed, preferably rectangular shape pushed over the free end of the busbar curved clamping bracket made of ribbon with clamping screw and one in one side wall located, preferably parallel to the edge line running guide slot,

d) a guided in the guide slot with play pin, preferably a dowel pin, in a Bore in the narrow side of the busbar at the end stuck, a limited movement of the

of standardized profile rails

in electrical switchgear

Applicant:

CA Weidmüller KG,
Berlebeck near Detmold

Wilhelm. Staffel, Königswinter / Rhine,
has been named as the inventor

Clamp allowed in a plane perpendicular to the busbar and the clamp cannot be lost stops on the power rail.

With reference to the drawings, the subject matter of the invention is explained in more detail using an exemplary embodiment explained.

As the figures show, the terminal consists of an angled busbar 1, which by means of an ordinary cylinder head screw 6 and counter bracket 5, the busbar on the mounting rail 3 holds. Due to the corrugation of the busbar and the suspension of the steel strip The busbar is securely in contact with the opposite flap and is secured against twisting and shifting held on the profile mounting rail. At the free end protruding beyond the mounting rail, the power rail carries 1 captive the tension bracket 2. The tension bracket 2 is held loosely but cannot be lost, namely in that it has a slot 7 in the one side lying against the overlap, in which a dowel pin 4 is performed. The earth conductor 8 is inserted into this tension bracket, as it is known for clamps. By tightening the cylinder head screw 9, the earth conductor is placed between the corrugated overlap opposite side 10 of the tension bracket 2 and the cross-corrugated side of the busbar 1 clamped.

Due to its shape, the earth terminal can be placed anywhere on the mounting rail before or after installation attached or placed between the terminal blocks.

To hold a terminal end plate or to secure the terminal blocks against displacement end angles are used. The earth clamp according to the invention has an angled

809 660/206

Claims (4)

Celt flap 11 and thus at the same time fulfills the task of such an end angle. The example of the earth terminal for plug connection shown in Fig. 2 is suitable for the widely used DIN rail according to DIjST 46 277. The same ground terminal for plug connection can also, as Fig. 3 shows, use with a different mounting rail profile or with little changed counter flap 5 for any other profile, eg. B. a U-profile, as Fig. 4 shows. On any smooth mounting surface, such as B. flat mounting rails or angle iron, the busbar is reversed without a counter bracket and fastened in such a way that the angled end of the busbar points away from the mounting base. An exemplary embodiment for this is shown in FIG. Fig. 1 together with Fig. 2 also shows the simple and captive attachment of the tension bracket 2 to the busbar 1 by means of a dowel pin 4, which is guided in the guide slot 7 of the tension bracket 2. When the screw 9 is unscrewed, the tension bracket 2 hangs lower. The earth conductor can be inserted into the space between the corrugated underside 10 of the tension bracket 2 and the cross-corrugated busbar 1 and clamped by tightening the screw 9, the corrugation ensuring good contact and damage to the conductor by the clamping screw according to the arrangement . The exemplary embodiments clearly show the versatility of use and the easy attachment of the clamp to the profile rail to be grounded. There is no need to work on the rail, the terminal is simply plugged on, and the aforementioned measures ensure a secure fit and good contact, as well as a simple possibility of killing the earth conductor. Pa TENTΛN SPRINGS: 1. Terminal for grounding standardized mounting rails, preferably in accordance with DIN 46 277, in electrical Switchgear, characterized in that it is made up of the following clamping parts: a) a busbar (1) with a preferably rectangular cross-section, one end of which is angled and serves as a support leg (la) on the support rail (3), while the other part ( 1b) on its straight side, over the support rail (3) protruding end (Ic) forms the terminal point for the earth conductor (8) to be connected, b) a counter-bracket (5) supported in the mounting rail (3), with the aid of a screw (6) this counter flap (5) and the busbar (1) from different sides against the Wall of the support rail are pressed and the shape of the counter flap (5) is chosen so that placing and clamping the busbar (1) at any point on the mounting rail (3) is possible c) one over the free end (c) of the busbar (1) pushed, closed, preferably bent into a rectangular shape, made of flat strip (2) with a clamping screw (9) and one located in a side cheek (2a ) , preferably running parallel to the edge line Guide slot (7), d) a pin (4) guided with play in the guide slot (7), preferably a dowel pin, which, stuck in a hole in the narrow side of the busbar at the end (Ic), a limited movement of the clamp in a plane perpendicular to the busbar allowed and holds the clamping bracket (2) captive on the busbar. 2. Terminal according to claim 1, characterized in that the busbar (1) on both narrow side surfaces at the protruding end (1 c) a cutout in a slightly larger width than has the clamping bracket depth, so that the clamping bracket is perpendicular to the busbar with play is led. 3. Clamp according to claims i and 2, characterized in that the counter strap (5) laterally angled tabs (11) (Fig. 5). 4. Terminal according to claims 1 to 3, characterized in that both the clamping bracket (2) as well as the busbar (1) at the clamping and contact points in a manner known per se Have corrugation. Considered publications:
U.S. Patent Nos. 2,216,309, 2,701,351;
Swiss Patent No. 296 137;
French patent specification No. 1,066,393. 1 sheet of drawings © sos 66O / 20 & 1 ».