CS232220B1 - Stirrup clamp for conductors connection - Google Patents

Abstract

U-clamp for connection electrical conductors, especially aluminum, whose shell is rectangular and lower shorter shoulder trough. Upper the shorter arm is doubled and created by folding the two ends of the shell over each other. The clamp compensates for so-called aluminum creep for electrical connections.

Description

(54) U-clamp for connecting electrical conductors

Yoke clamp for connecting electric conductors, especially aluminum conductors, whose sheath has the shape of a rectangle and the lower shorter arm in the shape of a trough. The upper shorter arm is doubled and is formed by folding both ends of the housing over one another. The clamp compensates the so-called aluminum creep at electrical connections.

232 220

BACKGROUND OF THE INVENTION The invention relates to a yoke terminal for connecting electrical conductors, in particular conductors made of aluminum.

There is known a clamp formed by bending a sheet of metal strip into a rectangular frame into which a conductor is inserted which is mechanically pressed by a tightening screw onto a current-carrying carrier, usually a metal strip.

The clamp described is only suitable for connecting copper conductors, not aluminum conductors, as it does not include a resilient pressure equalizing member when aluminum flows.

This disadvantage is overcome by the clamp according to the invention.

SUMMARY OF THE INVENTION The clamp shell has a rectangular shape, the lower shorter arm of which is bent in the middle into a V-shaped trough and the upper shorter arm is doubled and is formed by folding both ends of the sheath over each other. wherein a neck of an elongated threaded hole formed in the lower portion of the upper shorter arm is retained with clearance.

The advantage of the clamp according to the invention is that it allows the connection of both copper and aluminum conductors, since it eliminates the otherwise usual pressure reduction in the case of connection of aluminum conductors caused by the flow of aluminum subjected to pressure. The clamp is self-locking, without soldering or spot welding.

An exemplary embodiment of a clamp according to the invention is shown in the accompanying drawings.

Fig. 1 is a cross-sectional view of the inserted end of the attached aluminum conductor; Fig. 2 is a detail of the terminal sheath; and Fig. 3 is a cross-section of the terminal sheath.

The clamp according to the invention consists of a sheath 2, the current-carrying no232 220

The housing 2 is made of a sheet metal strip, preferably of metallized steel. It is bent into the shape of a rectangle whose lower shorter leg 4 is bent into a V-shaped trough. The lower shorter leg 4 is provided with a groove 10 on a portion of its surface at the point intended to abut the attached aluminum conductor 12. formed by folding both ends of the shell 2 over each other. A circular opening 6 is formed in the upper portion 41 of the upper shorter arm, into which, after completion of the bending, the neck 8 of the elongated threaded hole 54 is located in the lower portion 52 of the upper shorter leg. Between the neck 8 and the wall of the circular opening 6 is a clearance 7 of the size required to completely close the casing 2 when bending it. At the same time, the play 7 is also desirable for the free position of the neck 8 in the circular opening 6.

After the bending, the closed casing 2 is slid onto the U-shaped conducting carrier 1 with an opening 11 in its upper part through which the head of the tightening screw 3 passes.

The function of the clamp is as follows: an aluminum conductor 12 is inserted between the clamp housing 2 and the current-carrying carrier 1, and the prescribed torque is applied to the tightening screw 3. Upon tightening, the casing 2 is biased to the extent that the upper portion 51 and the lower portion 52 of the upper shorter arm are reciprocally moved. At the point of abutment of the aluminum conductor 12 on the lower shorter leg 4 of the trough shape, provided with the knurling 10, the oxide layer on the surface of the aluminum conductor 12 needs to be damaged and the transition resistance of the joint is improved. The relative movement of the upper part 51 and the lower part 52 of the upper shorter arm is defined by the play 7 between the neck 8 and the wall of the circular bore 6. After tightening the screw 3, stable properties are retained in the clamp. the conductor is compensated by the aforementioned relative movement of the top portion 51 and the bottom portion 52.

Claims (2)

SUBJECT OF THE INVENTION 232 220 Clamp for connecting electrical conductors, in particular aluminum conductors, consisting of a sheath formed by a closed bend of a metal strip, of a conductive carrier and a tightening screw, characterized in that the sheath (2) has the shape of a rectangle whose lower shorter arm (4) bent into a V-shaped trough and the upper shorter arm is doubled and is formed by folding both ends of the housing over one another, with a top opening (51) of the upper shorter arm having a circular opening (6) in which the neck (8) is attached an elongated threaded bore (9) formed in the lower portion (52) of the upper shorter arm. I> The clamp according to claim 1, characterized in that the lower shorter leg (4) is provided with a knurling (10) at least on the part of the surface to be seated in the bonded conductor (10).