FI60944C - ANORDNING FOER MAERKNING AV KLENA ELEKTRISKA LEDNINGAR - Google Patents

Description

Γ55τΠ [BJ (11) ANNOUNCEMENT 509/4

MA LJ '' UTLÄGGNI NGSSKRIFT

C Patent granted on 13 April 1932

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Patent and registration authorities in the Member States and the public 31.12. Ö1 (32) (33) (31) Privilege claimed — Buglrd prlorltet 13-08.75 Sweden-Sweden (SE) 7509060-5 (71) Elident Innovation AB, Hovslagargatan 5B, S-lll U8 Stockholm,

Swedish Sverige (SE) (72) Nils Oskar Tore Lööf, Gullspäng, Swedish Sverige (SE) (7¾) Oy Kolster Ab (5¾) Marking device for fine electrical wires - Anordning för märkning av klena elektriska ledningar

The present invention relates to a fine electrical wire marking device made of an extruded tubular body made of flexible plastic material, which is intended to be threaded on a wire and which, due to the flexibility of the material, can be used for mounting on wires of varying diameters. .

Marking devices of the type described above have been on the market for some decades. By way of example, reference may be made to the subject of Swedish Patent 214,614, which discloses a marking sleeve in which the marks are permanently attached to the outer wall of the sleeve-like body by a stamping method. Compared to even older devices in which the plastic piece acts as a holder for a separate nameplate, such a uniform marking sleeve has several advantages. The most important are the lower manufacturing costs and the completely eliminated risk of interference, which is due to the fact that the signs are detached after installation, for example during maintenance work 2 60944, and then installed in the wrong places.

In order to be able to use such a marking sleeve for wires of varying diameters in a certain area, so that it is not necessary to keep a different sleeve size for each wire diameter in question, it comprises a tangential part flattened to the sleeve. In this way, it is thus ensured that, as long as the sleeve is applied to a wire having a diameter in the stated range, it remains flexibly in the position about the longitudinal axis of the wire in which it is installed.

Briefly, for the sake of completeness, reference is also made to Swedish patent 327 745, which discloses a marking sleeve which can be used for wires in a large diameter range, whereby it remains in the installed position in wires with diameters close to the lower limit by providing a bellows-like support.

Recently, it has become increasingly common to label electrical wires even when this has previously been considered unnecessary, and in addition, as is known, developments have progressed more rapidly towards small circuits and components. As a result of both of these factors, there has been a need for marking sleeves that can be used for very fine wires. Until now, this need has been met by the use of marking devices, which have in principle been of the type discussed above. In other words, sleeves having the same basic shape as the sleeves used and suitable for thicker wires have been used and are otherwise limited to scaling down the absolute dimensions of the slender ones. However, it soon became clear that this did not solve the problem enough. The obvious drawback was that since the size of the part of the sleeve where the marks are located was reduced in the same proportion as the other parts of the sleeve, it was also forced to reduce the size of the marks to the same extent. Quite soon, therefore, the limit below which the mark text could no longer be read through the eyes of pal-Jair was passed. In this way, developments have inevitably come to the fore, which, from a purely labeling point of view, must be seen as a step backwards.

Another particular difficulty in labeling fine wires utilizing existing material relates to the following actual state of affairs. As is known, it is common for a number of reasons to connect a relatively large number of such wires into bundles or trunks. If each cable then has the above-mentioned, i.e. for example a marking sleeve according to the Swedish patent 327 745, this is mounted on a cable whose diameter remains within the lower part of the area to be used. In other words, the cross-sectional area of the wire fills only a small part of the sleeve, i.e. the marking of the device becomes so space relative to the cross-sectional dimension of the wire that it becomes completely impossible to mark each wire in a bundle of thin wires.

The object of the invention is to provide such a marking sleeve that it is particularly suitable for use on fine lines and does not have the above-mentioned drawbacks. Such a sleeve is mainly characterized in that, in the unmounted state, it has a substantially circular cross-sectional part, the inner wall of which corresponds at least to the circumference of the finest wire for which the device is intended and which at the ends of the arc becomes two substantially radially outwardly and furthest from each other. the inner walls of which form a space for signs.

By placing the marks on the radially outwardly directed parts of the device and not on the part intended to be limited to the cable, the following important advantages are obtained. The surface available for the signs is no longer limited by the diameter of the wire, but can in principle be made arbitrarily large. That is equal to the product of the axis length of the cord of the marking device and the length of the outwardly directed portions substantially radially with respect to the cord. It is observed that both of these dimensions can be enlarged without interfering with the circular portion. This now applies to the unmounted space of the marking device when its shape is adapted to the smallest diameter of the cable in question. When the device is used for a maximum length of wire and is thus fully stretched, the mark-bearing parts will of course no longer be radially oriented, but together with the circular part in an unmounted state will form a completely circular sleeve surrounding the wire and touching it at each point. As will be clear from the following, the available marking area is doubled, namely when the markers are placed on the outside of both outwardly directed parts.

An embodiment of the invention will now be described with reference to the drawing.

f '60944

Figure 1 shows on an enlarged scale a perspective view of a marking device according to the invention.

Figure 2 shows a perspective view and a wiring harness on a substantially natural scale, in which the individual wires are provided with marking devices according to the invention.

Figures 3 and 4 illustrate how the installation of the device in a fine wire can be performed.

Thus, Figure 1 shows a marking sleeve according to a preferred embodiment of the invention. The sleeve 1 consists of three parts, namely a part 2 which is substantially circular in cross-section and two side parts 3, 4. The length of the circular arc of the part 2 must correspond at least to the circumference of the finest wire for which the device is intended. As can be seen from the drawing, the cable receiving part 2 in this case forms an angle substantially greater than 180 °, in fact almost a complete revolution,

Thus, at the ends of the circular arc, the sleeve or tubular part 2 becomes two substantially flat and almost parallel wall parts 3 and 4, where the marks 5 are. Such signs may be present only in one or only - which is generally preferred - in both flat wall sections 3 and 4.

Fig. 2 thus shows a cable bundle in which each individual cable is provided with a marking device according to Fig. 1. The nameplates are attached to the points of the wires where the bundle is applied, for example to a multi-pin plug for connection.

Figures 3 and 4 show the use of a special tool, a chisel-like mandrel 6, for mounting a sign on a fine line 7. Thus, according to Figure 3, the first step is to insert a mandrel 6 between two flat wall portions 3 and 4, expanding the tubular part 2 7 can be easily imported. The mandrel 6 is then pulled out again, as shown in Fig. 4.

In fact, for the first time, it has been possible in practice to mark thin wires by means of the invention, because, as mentioned at the beginning, such a marking has been abandoned because reading has not been possible with the naked eye. Where faults have occurred in installations with a large number of such fine wires, it has generally been impossible in the past quickly! i i „5 60944 identifies an individual cable, which is why in such cases it has often been necessary to remove all the cables and perform the corresponding part of the installation again. The possibility achieved by the invention to mark very fine wires in a completely satisfactory manner has been achieved, because the invention refutes the traditional notion that the tubular sleeve or ring surrounding the wire must directly or indirectly support the marks. Thus, since the indicia-supporting portions 3 and 4 in the subject matter of the invention protrude substantially radially from the sleeve-like portion 2, the former portions can be conveniently placed outside the bundle, which not only means that the effective thickness of the bundle does not need to be significantly increased. It has already been mentioned above that the marks may be on the outer wall of either one or both of the substantially flat projections 3 and 4. It should therefore be added that in the latter case the marking text can also be divided, for example by fitting on one side letters identifying a particular main group of wires or the like, the individual wires in the group being numbered on the opposite side of the shield. Such an application, of course, in principle means doubling the available marking area while keeping the dimensions of the device unchanged.

Finally, it must be said that in the practical application of the invention it is possible to deviate to a large extent from the magnitudes which appear from the drawing. The installation can also take place in several cases without special auxiliary tools, because the device is simply compressed by hand vertically, as shown in Figure 1. As an example of the changed proportions of the device, it can be mentioned that the circular arc-shaped part 2 can be given a larger wall thickness than the indicia-supporting parts 3 and 4, which makes it easier to hold the device in very fine wires.

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Claims (3)

60944 1. -Marking device for fine electrical wires and the like, made of an extruded tubular body made of flexible plastic material, intended to be threaded on a wire and which, due to the flexibility of the material, can be used for installation in wires of varying diameters within a known distance that, in the unmounted state, it has a part (2) of substantially circular cross-section, the inner wall of which corresponds at least to the circumference of the finest wire for which the device is intended and which at the ends of the curve becomes two substantially radially outwardly connected parts furthest from each other (3, 4), the outer walls of which form a space for signs (5). Device according to Claim 1, characterized in that the same marks are arranged on each outer wall (3, 4). Device according to Claim 1 or 2, characterized in that the circular arc-shaped part (2) has a greater wall thickness than both parts (3, 4) in which the marks are located.