JPS63236277A - Screw clamp for conductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a screw clamp for a conductor, which has a cylindrical clamp body formed by bending a thin plate, into which a clamp screw is screwed. The present invention relates to a type in which the wall opposite to the wall is formed by folded portions of both side walls of the clamp body that overlap each other vertically.

DE-O8 No. 180580 filed by the applicant of the present invention
4, a screw clamp of the same type is known in which the screws are screwed into two folds located one above the other. This structural type was produced over several years and was well received by those skilled in the art, and the following points were already suggested by Alka and Shika in the above-mentioned specification DE-O8 1805804.

That is, its construction type is particularly important when implementing small screw clamps, especially when the clamp body is to be made as thin as possible (this is, however, particularly important when the screw clamp is to be used as a size clamp for circuit devices). (which is extremely important) has its limits. That is, the distance between the two side walls of the clamp body has been reduced to the point where it almost touches the outer diameter of the screw, so that the width of the inner bent portion for providing the screw hole is no longer sufficient to effectively support the screw. This is because the threads of the outer bent portion somehow effectively support the screw.

Furthermore, for example, DF-OS 1st
790153 specification or D]! ;-GM18 76
In the screw clamp described in No. 079, it is known that the clamp body is designed to be narrow. According to this configuration, in order to produce a sufficiently long and durable thread, a collar-shaped hole is provided in the center of the starting workpiece before the bending process, and the female thread is inserted into the hole. Processed. Other types of thread collars are known for the same purpose. For example, DB-As No. 109
1 Specification No. 168. With this configuration, a fairly durable screw thread could be obtained, but the clamp body O
Insufficient connection of the leg wall or side wall on the side opposite the thread of the screw. The folded structure described in the above specification not only involves an extremely complicated manufacturing process, but also consumes a large amount of material. This is because the cut shape of the material ceases to be rectangular, but instead becomes a T-shaped or laterally protruding strip.

As a result, tension-molded clamp bodies have come to be used when a clamp body with the smallest possible width is required. Such a lamp body is produced by cutting a single piece of molded tube precisely formed in multiple manufacturing steps.

However, the cost of such shaped tubes is extremely high, and at their ends, for reasons of manufacturing technology, a considerable amount of material was wasted.

The object of the invention is to provide a cost-effective method which, in particular, contributes to material savings and has a simple manufacturing process, while also guaranteeing safety against damage to the clamping body even when the clamping screw is fully tightened. The object of the present invention is to provide a screw clamp of the type described.

This problem is solved according to the invention in that one of the folds has a supporting tongue which is fitted into the window of the other fold. ing.

According to the above-mentioned configuration, the clamp body can be manufactured not from extremely thin clamp body or from a tension-formed tube, but from a strip material which is extremely advantageous in terms of cost.

The cutting shape of the material of the clamp body is square, so that in principle no material is wasted when processing a strip-shaped starting material. The punching out of the window and the partial punching out of the supporting tongue at the folding part, as well as the pushing of the supporting tongue into the window, do not involve any technical difficulties, so that after the folding of the clamping body, The two folds, which are placed one above the other, reliably prevent the side walls of the clamping body from widening in the transverse direction perpendicular to the screw axis.

According to a further advantageous embodiment of the invention, the window is provided in the inner fold and the supporting tongue is provided in the outer fold, and the supporting tongue is provided vertically in the outer fold. It points away from the edge and abuts at its tip against the window edge adjacent to the longitudinal edge of the inner fold. In this case, the supporting tongue is preferably bent inwards and pushed into the window of the barb from the outside. Although other contour shapes are conceivable, in the present invention the window and the supporting tongue have a rectangular contour that fits inside and outside of each other, advantageously with the long sides of the rectangle folded. oriented vertically.

Experiments have shown that when the clamping screw or screws are tightened until the screw head ruptures, the supporting tongue resists the compressive stress acting on it, and
For example, it did not come off the counter formed by the window edge. A further advantage of the invention is that the conductors or cords to be connected, preferably copper, are better held immovable by the recessed edges against tensile forces. The corners of the window serve a similar function to the transverse gib grooves provided at the bottom of known clamp bodies. It has also been found that there is no risk that the conductor, which has been forced into the window due to the deformation, will push the support tabs open from the inside and release them.

The invention will now be explained with reference to the illustrated embodiment.

The illustrated clamping body of rectangular cross section consists of a top wall 1, two side walls 2, 3 and a bottom part formed by two folds 4, 5 of the side walls which overlap one another one above the other. The upper wall 1 has six collar-shaped holes 6, the edges of these holes project upward and each has an internal thread γ, into which a clamp screw 8 is screwed. The clamping screw is provided with a wire protection curved piece 9, one of which is shown in dotted lines, and is known per se.

There are two screws on the inner bent portion 4 on the extension line of the clamp screw 8.
Two square windows 10 are punched out.

The outer bent portion 5 has two square supporting tongues 11t, which are located below the window 10, and six U-shaped sides of the square sides are separated. and is bent diagonally upward with respect to the plane of the folded part, and the edge of the folded part 5 on the opposite side to the vertical edge is in contact with the edge of the window 10, and the edge of the window 10 is It extends parallel to and adjacent to the longitudinal edge of the bend 4.

When the connecting wire is fully tightened with the clamp screw 8, pressure is generated between the upper wall 1 and the bent portions 4 and 5. However, this pressure merely causes the effect of pushing the side walls 2 and 3 apart and separating the bent portions parallel to each other. Such loads are completely taken up by the upwardly bent support tongue 11.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view of a clamp body according to an embodiment of the screw clamp of the present invention, Fig. 2 is a side view of the same clamp body, and Fig. 3 is a horizontal longitudinal cross-sectional view of the clamp body of Fig. 1. It is.

Claims (1)

[Claims] 1. A screw clamp for a conductor, which has a cylindrical clamp body formed by bending a thin plate, and a wall of the clamp body into which a clamp screw is screwed. In the type in which the opposite wall is formed by folded parts of both side walls of the clamp body that overlap each other one above the other, one of the folded parts (5) has a support tongue (11). and the support tongue (11) is attached to the window (10) of the other fold (4).
) into the screw clamp for the conductor. 2. Screw clamp according to claim 1, characterized in that the bend-joint formed by the supporting tongue (11) and the window (10) is formed on an extension of the clamping screw axis. 3. The window (10) is provided in the inner folding part (4), the support tongue (11) is provided in the outer folding part (5), and the support tongue (11) is provided in the folded part (5). The bent part (4) faces away from the longitudinal edge of the part (5), and the tip is inside.
2. The screw clamp according to claim 1, wherein the screw clamp rests on an edge of the window (10) adjacent to a longitudinal edge of the window (10). 4. Screw clamp according to claim 1, characterized in that the window (10) and the support tongue (11) have a rectangular profile that fits inside and outside of each other.