Untitled record

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AUSTRIAN PATENT OFFICE gLgLfr ?. »¹.

PATENT NUMBER NO. 210932

Appeared on September 10, 1960

OSNABRÜCKER COPPER AND WIREWORK IN OSNABRÜCK (GERMANY)

Tool for cable sheath production from a smooth tube

Reported on December 18, 1958 (A 8742/58); Priority of the application in Germany of 19.December 1957 claims.

Beginning of the patent period: 15.Feber 1960.

Cable sheaths of a metal with a higher melting point than lead are usually profiled in a wave or bellows-like manner, so that the cable is sufficiently bendable. The wave or bellows profile usually runs helically around the longitudinal axis of the cable. It corresponds to a sinusoid in the case of the waveform, in the case of the bellows shape it alternately has an outwardly curved, in the cross section semi-circular and an adjoining cylindrical, on the cable core resting part on. The ratio of the widths of these two parts in the direction of the cable longitudinal axis corresponds to the golden section, if the jacket is to bend the most favorable.

Such a cable sheath is made of a smooth cylindrical tube, in which the cable core is retracted before the tube is wave or bellows-like deformed. Understandably, the 10 clear width of the smooth tube must be correspondingly larger than the diameter of the cable core, so that the cable core can be fed before the corrugation in the pipe. Because otherwise the friction of the cable core in the smooth tube when pulling too big.

On the other hand, a smooth cylindrical tube is already pressed over the cable core during the production of these cable sheaths. Understandably, the tube also hiebei corresponds to a greater light Wel15 te than the diameter of the cable core, as between the hot tube and the cable core, a cooling mandrel must be arranged so that the cable core is not damaged by the pipe coming out of the press.

A smooth cylindrical tube as a starting material for the corrugated cable sheath is also already made by rounding a metal strip, wherein the abutting or superimposed band edges 20 are welded together. Also hiebei receives the tube has a larger inside diameter than the diameter of the cable core, because in the pipe production at least a distance-maintaining finger must be placed under the weld, on the one hand to keep the welding heat from the cable core and on the other hand, the emergence of a ridge in the weld prevent.

In the wave-like deformation of the smooth tube that surrounds the cable core, so far only wave troughs in the smooth, cylindrical tube push the 25 tools for wave-like deformation. As a result, the clear widths of the smooth cylindrical tubes must be very small in order to match the respective cable diameters to be shrouded as much as possible. This complicates the application of these cladding methods to those wire plants which source the smooth cylindrical tubes from a tube manufacturer and to the sheathing need to keep in stock. However, it also makes it difficult to use these sheathing methods in those cable plants which either press the tube directly onto the cable core or manufacture it from a strip during the sheathing; the required depth of curl is dependent on the desired bendability. It is generally smaller than the diameter difference between the respective available smooth tube and the cable core corresponds. Because the smooth tubes, which are held in stock 35, generally have differences of about 8 mm in their clearance. As a result, before shaving, the tube must be shaved down to the correct exit diameter required for the corrugation process by pulling or rolling unless it is just the right diameter diameter. However, this is rarely true for the abundance of various cable core diameters to. Downgrading the pipe diameter requires a special

Nr.210932

Arbeißgang. As a result, the material is inevitably solidified. This hardening of the material could only be remedied by a further processing step, namely soft annealing. But this requires special, cost-increasing facilities.

The invention avoids these inconveniences and the difficulties encountered by da5 that they designed for waves deformation tool designed such that it reduces simultaneously with the impressions of the troughs and the pipe diameter to the smaller, measured over the Balgenkuppen diameter of the corrugated cable sheath. For this purpose, the deformation surface of the tool has a broad beginning, which initially works the tube down to a slightly smaller diameter, then works the sinking troughs with the crests into the tube, and finally with a narrow progression gives rise to the final wedge profile the deformation surface of the tool, which works the trough into the pipe, has a small pitch, which works down during the incorporation of the wave trough freely between the opposing flanks of the deformation surface comb of the hereby waiting Wellenberg. The spiraling in their beginning deformation surface of the tool can also aufwei15 a steep gate and thereby work down during the incorporation of the wave trough freely between the opposing flanks of the deformation surface comb of the resulting wave crest. Understandably, the second and third measures can be used individually or simultaneously with the first measure.

For example, the tool for making a bellows sheath is shown. FIG. 1 shows a longitudinal section through a tool whose helical gate has a deformation surface that is wider at its beginning than at its end, FIG a plan view of a tool with steep, spiral gate and subsequent cylindrical guide, Figure 3 a

Longitudinal section through a tool with a small pitch and the tube deformed by this tool.

The following mean: 1 the tube, 2 the deformed tube, 3 the tool, 4 the pitch of the tool, 5 25 the spiral gate, 6 the subsequent cylindrical guide part, 7 the width of the deformation surface at the beginning of the spiral cutting, 8 the width of the deformation surface at the end of the spiral cutting, 9 the grooves in the deformation surface.

The initially wide and at the end narrow deformation surface of the spiral chamfer of the tool according to Fig.l presses down with the broad beginning of the wave trough and also the subsequent tube part for the wave crest.East the leaking narrow part gives rise to the final shape for the wave crest.

The steep spiral section 5 of the tool according to FIG. 2 presses down the wave trough in a correspondingly steep front which, to a certain extent, it pushes in front of it. As a result, the wave crests are pressed down with.

The deformed with a tool of FIG. 3 pipe is - as the drawing readily shows 35 reduced as a result of low pitch in its inner and outer diameter, because with the incorporation of the closely adjacent wave troughs and the intervening Wienberg are inevitably down.

The following information is provided for further explanation:

It is a cable core of 43 mm diameter to coat and a wave height of 4 mm ge40 calls. Then you usually need a tube of 51 mm diameter. For storage reasons, however, only one tube of 50 mm and 57.5 mm are available. The tube of 50 mm would result in too low a wave height. The 57.5 mm tube, on the other hand, would first have to be pulled down to 51 mm diameter before it can be corrugated. With the tool according to the invention, the desired corrugation is contained in an arcing passage.

It is a cable core of 10 mm diameter with a very thin-walled tube of a wall thickness of 0.25 mm to coat. The wave height, which would give the cable the necessary bending ability, is 1 mm. In a tube that has only 2.5 mm difference in diameter compared to the cable core, the cable core can not be retracted. The tool according to the invention allows the use of a tube with a larger clearance, the retraction of the cable core no

Presents difficulties.