Textiles: braiding – netting – and lace making – Processes and products – With material incorporated in diverse ways
Reexamination Certificate
1999-12-09
2001-11-13
Worrell, Danny (Department: 3741)
Textiles: braiding, netting, and lace making
Processes and products
With material incorporated in diverse ways
C087S009000, C057S210000
Reexamination Certificate
active
06314855
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is concerned with a cable with a cable core, a cable jacket and at least one tear thread present between the core and the jacket. Such cables are widely used in order to facilitate stripping, i.e., in order to part or remove a layer of the cable more easily, for example, the outer coating, without damaging layers that are situated beneath this coating.
Given specific applications, an exact positioning of the tear thread is desirable, wherein the position can be made visible for the installer by means of marking the outside covering or jacket. However, it becomes clear than an exact positioning is difficult and can get lost given processing steps during manufacture. This problem is particularly present when a steel grooved jacket is used. For example when a cable that contains a steel grooved jacket with two tear threads is to be manufactured, the tear threads should preferably lie opposite one another. An approach in order to oppose the above-mentioned problem is to introduce a multitude of tear threads, so that at least two tear threads are opposite one another or, respectively, at least one tear thread is presented in the desired position or location.
Given cables with tear threads having a small length, another problem occurs. In a cable of a small length, it is frequently the case that the tear threads are pulled out of the cable without parting, tearing or breaking the cable jacket.
SUMMARY OF THE INVENTION
The present invention is directed to an object of providing a cable wherein the movement of one or more tear threads is inhibited or prevented. Another object of the invention is to provide a method for manufacturing such a cable.
These objects are achieved by a cable having a cable core, a cable jacket and at least one tear thread positioned between the core and the jacket, wherein the tear thread is fixed in position by means of at least one auxiliary thread. The method of the present invention comprises the steps of providing a cable core, arranging at least one tear thread on the cable core and arranging at least one auxiliary thread in order to fix the tear thread on the core and then arranging a cable jacket that surrounds the cable core, the tear thread and the auxiliary thread.
Given the inventive cable, the at least one tear thread is fixed in position by means of at least one auxiliary thread. Therefore, the tear thread cannot move out of the imagined position, either during the process of manufacturing the cable or given a post-processing, such as laying the cable or installation of the cable in cable ducts.
Advantageously, the inventive cable comprises a plurality of tear threads, in particular at least two tear threads. For example, individual layers of the cable can be parted independently of each other and can be parted following one another by the utilization of a plurality of tear threads. Alternatively, the utilization of a plurality of tear threads enables the parting of the cable layer, for example enables the parting of the coating at a plurality of positions.
Given the utilization of a plurality of tear threads, these are preferably equidistantly arranged around the cable core in a preferred embodiment of the inventive cable. For example, when two threads are present for parting the outside coating, these should lie diametrically opposite one another.
Preferably, the tear thread is wrapped by one or more auxiliary thread in order to achieve a particularly firm fixing and position. Not only an axial movement, but also a radial movement of the tear thread is inhibited by the wrapping, which, as warranted, can be supported by a knotting or tying.
Advantageously, the auxiliary thread or threads form a braid or a weave which preferably is what is referred to as a KEMAFIL type, which is described in a publication “Sonderdruck aus Band- und Flechtindustrie 30 (1993, 4-10, 76-81, 31 (1994)), 48-52”. A more uniform total appearance of the cable can be simply achieved when the auxiliary threads are presented in such a form. Furthermore, a displacement of the auxiliary threads can also be avoided.
Finally, it is preferred that the tear threads are a part of the above-mentioned braid or weave and, in particular, extend parallel to the longitudinal axis of the cable.
At least one tear thread is arranged at the cable core in the inventive method for the manufacturing of such a cable. Thus, it should be understood that the cable core is an arbitrary structure which, for example, can be comprised of a plurality of layers. This particularly means that also an inventive cable can be understood as a cable core. At the same time or subsequent to the arrangement of at least one tear thread at the cable core, the tear thread is fixed in position with an auxiliary thread. Finally, a cable coating is arranged, which cable coating surrounds the cable core, the tear threads and the auxiliary thread. Thus, the inventive cable is manufactured with the inventive method.
Advantageously, a plurality of tear threads, particularly two tear threads, are arranged in order to individually successively part a plurality of layers of the cable or in order to part a layer at a plurality of positions.
Preferably, the auxiliary thread at least partially wraps the tear thread in order to guarantee an increased fixing of the tear thread given this arrangement. This wrapping can additionally comprise a knotting or looping and can comprise a multiple wrapping.
Given a preferred method, the tear thread and the auxiliary thread, essentially at the same time, are arranged as a braid or woven fabric. The arrangement advantageously occurs according to the known KEMAFIL technology, whereby the tear thread or the tear threads are integrated into a structure that is being formed.
Finally, it is preferred that the two tear threads and the two auxiliary threads, essentially according to the KEMAFIL technology, are knitted around the cable core so that the tear threads extend parallel to the longitudinal axis of the cable and are fixed in position by the auxiliary threads by means of this wrapping.
The auxiliary thread preferably exhibits less resistance to tearing than the tear threads in order not to impair the function of the tear threads. Given pulling of the tear threads, this means that the coating arranged thereupon is parted at the same time with the auxiliary threads. Therefore, a means is provided with the inventive method and the inventive cable in order to avoid an offset of the tear threads. Particularly, an exact positioning of the tear threads can be simply achieved and maintained given the process of manufacture, the post-processing and also the laying or installing of the cables.
Other advantages and features of the invention will be readily apparent from the following description of the preferred embodiments, the drawings and claims.
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Buechner Oliver
Uhlenhuth Guenther
Alston & Bird LLP
Siemens Aktiengesellschaft
Worrell Danny
LandOfFree
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