JPH06503200A - electric cable - Google Patents

Abstract

An electrical cable comprises one or more insulated elongate electrical conductors (1, 2), a metal electrical shield (5) surrounding the conductors and a pull-thread (7) that extends along the cable under the shield so that the shield can be cut longitudinally by pulling the thread. The cable can be stripped of shield and jacket simply by pulling the thread and then tearing the end of the shield and jacket off. If desired a second conventional pull thread may be located between the shield and jacket in order to allow the jacket to be removed and the shield exposed.

Description

[Detailed description of the invention] electric cable The invention relates to electrical cables, in particular for preventing or reducing electromagnetic interference, e.g. Relating to electrical cables equipped with a shield.

A commonly used Jahei cable has a single elongated electrical conductor with a dielectric and There are coaxial cables that are surrounded by a conductive jacket. Other shielding cables , one or more insulated conductors are arranged, for example in a twisted pair, and The conductor or conductors are surrounded by a single common shield.

Where shielding cables are used, e.g. Underlying insulation for termination to black box with cable connections Cutting of the shield is often required to expose the exposed conductors. braid The usual methods of terminating cables with shielding are (1) by means of a knife; form a notch or slit in the jacket, and then pull it out from the jacket, and, (if) Push the exposed end of the braid axially toward the remaining section of the braid and release. Inflate it in the direction of the arrow and cut the braid at an appropriate point using scissors.

This process has significant drawbacks, such as requiring the use of a knife. cable end The use of knives in cutting and harness formation is disappointing, and many harness shops equipment that can inadvertently damage the insulation of harness wires or cables. Knives are not permitted due to the risk of disabling them. Furthermore , in some situations it is difficult to inflate the braid radially by pushing it axially. There are difficult times. For example, some shielded cable geometries reduce the cable cross-section. , to reduce cable weight, the cable shielding is essentially a flat break. Formed of a single wire with a surface, this shape of cable is susceptible to axial pushing. It is extremely difficult to inflate more radially.

According to the invention, one or more elongated electrical conductors, one or more an insulating layer surrounding an electrical conductor and a metallic electrical layer surrounding a conductor or conductors; An electrical cable is provided that includes an air shield along the length of the cable. includes a pull-out thread that extends below the knoll, and by pulling this thread, the /- knoll is canted vertically. Draw threads or strips without wasted effort. By pulling the wrapping thread along the cable, for example It turns out you can cut through the cable shield. In fact, through critical metal thickness Even if the thread is used to cut The effort required to cut through the cable jacket may, under some circumstances, be more than enough to cut through the cable jacket alone. substantially greater than the effort required to Cables always burn out Although it is not necessary to include the cable jacket when the braid is cut by the thread, This construction is preferred because the nets impede or prevent movement of the lines of the braid. preferred Examples of suitable jacket materials include ethylene, homopolymers and alpha okef. Polymers such as copolymers with fins, e.g., tetrafluoroethylene, vinyl Zoline fluoride, hexafluoropropylene and vinyl chloride homo, pro Halogenated polymers, such as polyamide, polyester, polyester Polymer ketones such as ketones, aromatic polymerizaimisodes and sulfones alkali-based/vinyl acetate copolymers and equivalents. include.

Polymers may be used alone or blended with others. Fillers such as silica and hydrated alumina may also be used. and treated or untreated metal oxide flame moderators such as titanium. You can.

The present invention has a single central conductor surrounded by a dielectric material, like a coaxial cable. It can be applied to cables with wires or one layer of shielding wire, but It is more applicable to multi-conductor cables such as cables. shield If it is difficult or difficult to inflate the shield by pushing towards the remaining shield Not only because it is impossible, but also because of geometrically helical insulated conductors or wires. Because of the resulting undulating surface of the cable, the cable in the case of braiding with flat wires Until now, it has been relatively difficult to cut down on this barrier. Multi-conductor case In the case of cables, there is a pull-out thread that runs inside the cable as a separate wire, and this thread Cutting the shield and jacket along a helical path when pulled is possible. This is not particularly easy or convenient for the operator to do manually, and A pull line is attached to the cable in order to pull it in a substantially uniform direction along the cable. Preferably, it extends substantially axially along.

Basically, the invention provides cables with a variety of screens, usually in the form of a braid. The present invention may also be applied to cables having a braid formed of flat lines. Particularly suitable for This type of flat braid is extremely flexible due to the yarn. It appears easy to cut, and the ease of cutting and normal The difficulty of stripping flat braided cables by the method of Ru. The lines of the braid do not easily slide past each other, but when subjected to forces that distort the braid At times, they tend to become fixed. The normal stripping method will cause the braid to swell. and in the cable according to the invention the same tendency is When cutting the line, it prevents any adjustment of the stress applied by the thread.

The drawstring is preferably an electrical insulator, more preferably a polymeric It is formed in the shape of The most preferred material is, for example, under the trade name "Ke" by Akzo. ylar”, an aromatic polymer commercially available as It has a shape made up of a relatively large number of lines.

The cable may be provided with one or more stripping threads. For example, shield with one thread below the jacket and a second thread below the jacket but above the shield. A portion of the shield may be exposed by tearing off only the jacket.

Examples of shielded cables according to the present invention with reference to attached drawings are disclosed below. .

FIG. 1 is a perspective view of a twisted pair of shielded cables. FIG. 2 is a perspective view of a twisted pair of shielded cables. Side view of the cable at multiple steps during processing Please refer to the attached drawing. A twisted pair of shielding cables includes a twisted pair of wires 1 and 2. each of which has a twisted tin-plated copper conductor 3 and, for example, a polyethylene or single-walled or double-walled insulator 4 made of polyvinylidene fluoride and/or polyvinylidene fluoride including.

The shield 5 is provided in the form of a flat tinned copper braid, followed by The outer jacket is extruded from ethylenetetrafluoroethylene copolymer. A port 6 is provided.

A large number of single wires made of Aromatic Polymide (trade name “)” (marketed under the name “evar”) The formed drawing thread 7 is inserted into the cable under the cable jacket 6 and the shield 5. extending axially along the length of the shaft.

To cut the shield 5, the shield and jacket are cut to the desired length. Until then, a given draw thread 7 is simply pulled in the direction perpendicular to the cable. the The shield may be terminated by any suitable method.

FIG. 2 shows a side view of some of the twisted pairs of shielding cables. cave The cable consists of a pair of insulated conductors 1 surrounded by a braided shield 5 and a jacket 6. and 2. The cable includes two pull-out threads, one thread 7 is a seal The second thread 8 is located below the jacket 6 but on the shield.

Threads 7 and 8 have different colors or patterns to distinguish them from each other.　′ To strip the cable for terminal connection, cut the cable into a small length 9, e.g. a few centimeters. The length is cut by means of scissors. In this movement, threads 7 and 8 Because of their own strength, they are usually not cut, so each prefecture with a short length is shown in Figure 2a. It is exposed as such. Thread 7 then makes slits in jacket 6 and shield 5. At that point, the shield 5 is tidyed up with scissors, and as shown in Figure 2b. It is formed into a cable like the one shown in . After that, the length you want to expose the shield 5 In order to make a slit in the jacket 6, the thread 8 is pulled. jacket The ends of the torso 6 are torn along the circumference and tidyed up by means of scissors, as shown in the figure. A cable shown at 20 is obtained. If the length of the drawn thread exceeds the Canted in places.

International search report DrT/l:GI Ql/n) 116

Claims (9)

[Claims] (1) one or more elongated electrical conductors; one or more electrical conductors; A surrounding insulating layer and a gold surrounding the conductor or conductors and the insulating layer. An electrical cable that includes a generic electrical shield, the cable having a cable underneath the shield. includes a pull-out thread that extends along the length of the cable, and by pulling the thread, the Electrical cable cut lengthwise. (2) The cable of claim 1, wherein the electrical shield is in the form of a braid. (3) The cable according to claim 2, wherein the braid is formed of a flat wire. (4) Claim 1 includes a cable jacket located on an electrical shield. The cable according to any one of paragraphs 1 to 3. (5) Any of claims 1 to 4 that includes a large number of insulated elongated conductors. Cables listed above. (6) The draw thread extends substantially axially along the cable. The cable according to any one of Items 1 to 5. (7) Any of claims 1 to 6, wherein the drawn string is an electrical insulator. Cables listed above. (8) Any of claims 1 to 7, wherein the drawn thread is made of a polymer. Cables listed above. (9) According to claim 8, the drawn thread is made of aromatic polymeride. cable included.