KR830001742B1 - Branch seal formation method - Google Patents

Abstract

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Description

Branch seal formation method

1A and 1B illustrate exemplary clips suitable for use in the present invention.

2 is a state diagram of use of the first clip according to the present invention.

3 is a state diagram of use of two clips according to the present invention.

4 is another use state of the clip.

5 is the second type royal road of the clip.

6 is a state diagram of use of the fifth clip according to the present invention;

7a and 7b show a state of use of a clip required to provide a branch for an inlet or outlet valve.

The present invention relates to a method for forming a branch seal, and more particularly to a method for insulation and protection of power tracks, etc. using resilient products.

The present application is a split application of Korean Patent Application No. 792 of March 16, 1979, which is an essential advantage of the present invention and the original application due to the structure of the clip used to form the branch seal. That is, when at least two substrates are sealed in a heat shrinkable sleeve to seal, at least two external angles in the original application and at least two substrates between them are sealed at least two external in the original application. The use of clips with at least one internal long angle between them, as well as with long angles, is used herein with clips having only at least two external long angles without internal long angles.

Accordingly, the present invention provides a method of sealing by branching at least two substrates in a heat shrinkable sleeve,

(a) placing a clip of at least two long angles so that both are positioned on the outer surface of the heat shrinkable sleeve end to form at least two terminal conduits,

(b) allow each substrate described above to enter each of these terminal conduits,

(c) characterized in that it comprises a step of achieving a desired sealing state by heating and shrinking.

It will be appreciated that steps (a) and (b) may be performed in any order or at the same time. For example, in many cases the clip will be pushed into position immediately after the sleeve is positioned over the substrate.

The invention also provides a clip suitable for use in the method. Although the use of clips and other fasteners in connection with heat shrinkable products has been proposed, a method of using a clip as in the present invention to form two or more outlets from a heat shrinkable sleeve and to maintain these outlets with respect to the resilience of the sleeve. It has not been proposed before.

Therefore, Belgian Patent 833,916 proposed to provide a clip between the outlets of the splice case, but it states that the heat resilient surfaces should not be in contact with each other. For this reason, the heat resilient material itself It specifies that the action of the splice case should be formed from the heat return top located on the non-heat return bottom equipped with ridges or fingers to avoid contact when passing around the cable. In addition, the material on the heat recoverable top is not deformed, so the clips placed between the cables, except around the cable, do not contain any heat recoverable material, and therefore no return force acts on them. This is claimed to be an advantage.

Similarly, German publication 2,413,623 proposes the use of a U-shaped clip in relation to an ear return basin, but the clip is not used until after shrinkage and is an X-shaped insertion member placed inside a return sleeve between adjacent cables. It is designed to be positioned on the bed.

Therefore, the methods of using the clip in the known art are completely different from the method of using the clip in the present invention.

The clip used in the present invention is, most simply, U-shaped and its embossed surface on the outer surface of the heat-resilient sleeve or wrap-around sleeve bite together or the surface of the heat-resilient sleeve wrap-around sleeve and itself are different. Sliding on another common acting surface, which may be part of the heat recoverable component, so that the surface of the sleeve and itself acts on another common acting surface, which may be part of another heat recoverable component, to form a conduit at one end of the sleeve. Such clips are surprisingly not "milk-off" during recovery. Of course, if the substrate is particularly large, this clip should be long enough, but a simple test can easily determine the appropriate length, and resistance to milk-off forms a tooth or uneven surface on each part of the clip if necessary. By increasing it, but this is generally not necessary.

Another way to avoid milk-off is to add salt to the clip and the adjacent heat recoverable material before full return occurs. This partial salting process partially increases the thickness of the dye returnable material and increases the control of the clip. In addition, providing the inner coating layer of adhesive in the sleeve or the wrap-around sleeve causes the adhesive to flow and thus form a satisfactory bond to the adjacent portion of the clip before returning around the substrate. This partial heating process can be advantageously used for all types of clips used in the present invention.

According to another example of the invention, the clip itself is configured to eliminate the problem of milk-off as described in detail below and is adapted to comply with any conditions for this purpose.

Clips used in the present invention can be made beneficially with a single conductive material and can also be configured to add salts to salt-repellent materials in the vicinity thereof (for example, as described in German Patent Publication No. 2,756,021). good). However, in other instances, the dye-repellent sleeves are equipped with internal salting or self-contained salting devices, in which case the clips are made of non-infectious material.

For this and other reasons, the clips are preferably made of metals, including steel, copper, bronze, beryllium copper and especially aluminum. For example, aluminum clips can be produced by injection molding and then polishing as far as possible to remove sharp edges (blades), and steel clips can be punched out and, if necessary, produced by similar polishing operations. In many applications it is better to rust clips. For example, the aluminum clip may be black plated or form a chromium layer capable of preventing mechanical damage, for example, by an epoxy resin film. Such a coating may provide electrical insulation, for example, in a cable in which two conductors are joined.

The importance of the clip's function in heat transfer to heat up and down heat-resilient materials and adhesives in their vicinity is another factor that has not been recognized in prior art. Therefore, Belgian Patent 833,016 describes that clips can be made from metals, and the present invention also describes a number of other non-thermally conductive materials, such as plastics, which are generally not suitable. Preferred materials are glass filled polyamides. German Federal Publication No. 2,413,623 does not mention the raw material for making clips.

In certain applications, the clip metal is a memory alloy, such as nickel-titanium alloys described in US Pat. Nos. 3,174,851, 3,3,51,463, 3,753,700 and 3,759,552, US Pat. Nos. 3,783,037 and 4,019,925 It may be one of the beta-bronze alloys described in. In such an example, the clip itself may be heat returnable so that the relief of the clip may move in mutual directions when the assembly is heated to shrink the sleeve (or alternatively the clip may be heat returned before and after the process). Pre-conditioned memory alloys, in particular beta-bronze alloys, are preferred in view of the present invention. Such alloys and methods of preconditioning them are described in US Pat. Nos. 4,036,669, 4,067,752, and 4095,999.

In another example, the clip may be made of an elastic metal such as spring steel or beryl copper and may exert an elastic force to enhance the formed seal. The externally deformed parts of the elastic deformation can be " held out " by, for example, a thermosensitive adhesive, and elastic together when heated.

The simplest shape of the clip used in the present invention is generally U-shaped, but it can be seen that its structure may vary depending on the application. For example, in some applications it is necessary to form two or more outlets at the ends of the heat recoverable component. This can be done by installing two or more rigid U-shaped clips between the outlets, and in other arrangements a single clip with three or more angles can be used so that one set of each adjacent arm can act as a simple U-shaped clip. . These and other arrangements are also within the scope of the present invention.

The strength of the clips used in the present invention is increased when these clips are made of a planar material, ie when the width of the legs extending above and below the heat resilient sleeve is greater than its thickness in contact with the sleeve. Generally, the width will be 1.5 to 3 times the thickness.

In some particular preferred embodiments of the present invention, one or more portions of the clip can be used to fulfill secondary functions.

In another embodiment, the clip may be equipped with a device for maintaining electrical conductivity, for example between insulated cables located in the conduit. Such a device can be constructed by installing one or more corners to receive and support a tag, such as a tuck, for example, to receive and support tags attached to or cut from the insulation of the cable.

It is generally not thought that these clips will be used for connection with other members, but in some cases it would be beneficial to use the method, for example in connection with the mastic tape method described above. In some cases it may also be advantageous to use clips to connect the heat recoverable sheet material to other components.

The heat recoverable sleeve may be a wrap-around sleeve or may form a closed end. That is, it may be an end cap or part of a large product, for example a part of a large heat recoverable product, and in any case it should be understood that the invention is not limited in any way to the size or structural arrangement of the heat recoverable component. do. For example, the heat shrinkable sleeve may be formed from two (or more) plate-like heat recoverable materials. In everything necessary for the purposes of the present invention, the heat shrinkable component has a hollow end portion and a substrate is located therein.

If the clip is used for contact with the wrap-around sleeve, it is advantageous to form the clip so that it can cooperate with the wrap-around device. In some cases, it is possible to form a clip as a part of the fixing device.

The clip is held firmly in place by the heat resilient sleeve, and in some instances it may also be made adjustable so that the spacing between the parts can be changed depending on the thickness of the sleeve, thereby encouraging the formation of a fixed bite upon return. In some applications it may be beneficial to equip the clip with one or more members that cooperate externally with the substrate of the heat resilient sleeve to ensure that the clip has the correct position. For example, the clip may be provided with an annular member suitable for enclosing the outer periphery of the pressure carrier of the heat shrinkable splice case joint. As another example, a metal strap surrounding the cable may be attached to the clip to eliminate stress in the joint between the cables.

The heat recoverable material may be any polymer known in the art to be useful for the manufacture of heat recoverable products. Generally, the plate material is of a constant composition, but sometimes two different polymer bonded laminates or fused laminates may be used. have. Among the suitable polymers are, for example, polyolefins, in particular polyethylene, copolymers of ethylene and vinyl acetate, copolymers of ethylene and methyl acrylate, chlorinated or differentiated polymers, in particular polyvinyl chloride, polyvinylidene fluoride and vinylidene fluoride, hexafluoroethylene and chloro And silicone rubbers that can be used in admixture with crystalline or glassy polymers such as polymers comprising units from trifluoroethylene, ethylene / propylene rubbers, rubber chlorides, such as neoprene and olefin polymers. All of these materials can go and combine, for example, by irradiation and / or chemical methods, if necessary.

As mentioned above, the inner surface of the heat recoverable component is generally coated with a sealant or mastic, such as an adhesive or a hot melt adhesive. Examples of particularly suitable heat melting adhesives include polyamides, ethylene / vinyl acetate polymers and teptpolybars (with or without mixed waxes) and polyesters. Such materials are described, for example, in British Patent No. 1,440,810 and German Federal Publication No. 2,709,717. Also suitable are curable adhesives which melt and flow upon heating but do not thermally melt thereafter. Examples thereof include known mastics based on epoxy resins and rubbers modified with suitable materials known in the art, such as botyl and isobutyl rubber, for example. The use of these materials or other uses and, if chosen, their distillation in any case depends on the specific conditions.

For most applications, the force acting on the clip will be in the range of 5-15 kg, depending on the diameter and wall thickness of the substrate and the degree of microcrystalline return of the sleeve. In this latter view, the heat resilient sleeve is required to be non-shrinkable in comparison with the mastic tape method and thus has a smaller expansion rate, because the clip is applied to the cable around the center at the center by applying force to the sleeve, This is because the sleeve does not come into contact with the cable at this location. Of course, the degree of expansion required for the sleeve is lower using tripod clips than when using simple U-shaped clips.

The present invention is intended to provide a very simple way of forming sufficient branches, and it can be seen that the cost would be considerably cheaper without the need for skilled installation techniques. The long angle of the clip ensures that a seal is formed from the edge of the heat recoverable material to the end of the long portion so that the substrate can be satisfactorily separated throughout its entirety.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figures 1a and 1b in the drawings show an aluminum clip 1 for use in the present invention. The widths of the legs 2 and 3 are larger than their thickness. Also, the base of the interstices between the legs 2 and 3 was cut in (4) for strength reinforcement. Representative dimensions of the clip are as follows.

Length: 64mm Width: 24mm Length of each part: 52mm

Arm width: 10mm Arm thickness: 5mm Gaps between arms: 4mm

2 shows how it is used for branching for the two types of telecommunication cables 5 and 6 incorporated into the XAGA type place case 7 as described in British Patent No. 1,431,167. This assembly is shown after the return.

FIG. 3 (cross section) shows the use of two such clips to form a three row branch in a similar product. The clip 1 is of great importance if it is to act to isolate the cables 8, 9 and 10 by a certain distance and at the same time maintain the separation during subsequent bending and bending of the cable. This has been a problem in the mastic tape method.

4 shows the application of a single clip 1 to a conduit sealing opening 11 of the type described in JP 2,748,894. As can be seen in the figure, the conduit seals are arranged to allow the multi-wire cables 12 and 13 to pass through conduits (not shown), for sealing agent 15 located between them. An outer flange 14 is provided. When the flanges 14 are heated to deform, the sealant 15 melts and flows so that the device is sealed in the conduit.

In FIG. 5 an aluminum clip 16 with three corners 17, 18 and 19 is shown, which are arranged symmetrically around the longitudinal sphere of the clip. These parts are similar in some respects to the first-degree clip 1, and part of the clip is cut at the base of the gap between the strength reinforcing arms.

7 shows a method of forming a three row branch at the end of the XAGA type splice case 20 using the clip 16. As shown in the figure, one of the branched conduits 21 thus formed causes some shrinkage around the reinforcing coils and is equipped with end caps 23 in accordance with Federal Republic No. 2,748,383. The end cap 23 can be removed if it needs to use the feed-path device 22.

In FIG. 7 a method is shown in which two triangular clips 57, 58 are used with a wrap-around splice 59 to form branch inlets and outlets at their ends. In this case, inlets and outlets are provided with separators 60, 61 (shown in FIG. 7B) which form substrates in branches from cables 63, 62, respectively.

Other variations and modifications within the scope of the invention will be apparent to those skilled in the art.

Claims (1)

To branch and seal at least two substrates in a heat shrinkable sleeve, clips of at least two long angles are placed such that the long angles are all located on the outer surface of the end of the heat shrinkable sleeve to form at least two terminal conduits, A method of forming a branch seal, characterized by comprising the steps of allowing each of the above substrates to enter each terminal conduit, and then heating and shrinking to achieve a desired sealing state.

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