Textiles: spinning – twisting – and twining – Apparatus and processes – Covering or wrapping
Patent
1998-10-13
2000-03-07
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Covering or wrapping
57 18, 2424413, D02G 336
Patent
active
06032449&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The device, which is known from DE 37 02 781 A1, for attaching an optical cable to the overhead ground cable of a high-voltage line comprises a stranding machine, which can be moved along the cable and carries with it a cable drum, and a lapping machine, which is coupled to the stranding machine and is equipped with a supply drum for a holding tape. Both machines have a drive which moves the respective drum over an orbit about the overhead ground cable. Since the cable drum is guided around the overhead ground cable with a changing direction of rotation, the optical cable is wrapped around it in the manner of an SZ stranding. The holding tape, which is applied in a long lay, serves to fix the lapping formed by the optical cable.
The device, which is known from DE 32 28 227 C2, attaches an optical cable with the aid of discrete lashing elements on a supporting conductor, but the retaining clamps, which serve as lashing elements, subject the cable to comparatively high mechanical loads. Moreover, there is a risk of the thermally expanded cable sagging between adjacent lashing elements, which may be disadvantageous in particular with regard to leakage currents occurring, but also with regard to the mechanical loading.
SUMMARY OF THE INVENTION
An object of the invention is to provide a simple way of attaching an optical cable to a conductor of an electrical overhead line in a reliable and rapid manner. This object is achieved by means of a device comprising a supply drum for an optical cable being mounted to rotate about a first axis; a supply reel for a first lashing element being mounted to rotate around a first longitudinal axis; first means for aligning the optical cable parallel to a longitudinal axis of a conductor to form a unit as the optical cable is hauled-off the supply drum; second means for displacing the supply drum and first supply reel in a direction of the first longitudinal axis of the conductor while maintaining the spaced orientation of the first axle; and third means for holding and rotating the first supply reel about a second axis which is oriented parallel to the longitudinal axis of the cable so that a first lashing element wraps around the unit in the form of a spiral.
The objects are also achieved by a method for attaching an optical cable to a conductor of an overhead line comprising the steps of providing a lashing device having a supply drum for the optical cable mounted for rotation on a first axle; displacing the lashing device and supply drum along the conductor of the overhead line; unwinding the cable from the supply drum while maintaining the orientation of the first axle and placing the cable adjacent the conductor to extend parallel thereto to form a unit; and wrapping a first lashing element around the unit in a spiral path by rotating a supply reel around a first axis as the element is withdrawn therefrom and rotating the reel around a second axis parallel to the longitudinal axis of the unit.
The supply reel, which is mounted so that it can revolve about its longitudinal axis, allows the haul-off rate to be increased and thus allows the cable installation time to be reduced. Moreover, the helical movement of the supply reel around the conductor allows the lashing element to be braided around the optical cable in a continuous coil or spiral.
Since the comparatively heavy cable drum does not have to move around the overhead ground cable, the mechanical structure of the device is considerably simplified. In addition, there is no need for any centripetal forces caused by the revolution of the cable drum to be compensated for by means of a corotating counterweight or to be picked up and taken off by bearings of correspondingly large dimensions. This allows the device to be of a more lightweight structure and to be moved over the conductor much more quickly than has hitherto been customary, so that the assembly time and assembly costs can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of an exemplary embodiment of a lash
REFERENCES:
patent: 2402172 (1946-06-01), Macy
patent: 2592943 (1952-04-01), Neale
patent: 2663544 (1953-12-01), Harley
patent: 3162992 (1964-12-01), Davis et al.
patent: 4274574 (1981-06-01), Bishop
patent: 4311299 (1982-01-01), Elliott
patent: 4424954 (1984-01-01), Innes
Einsle Gunter
Kreutz Dieter
Mayr Ernst
Siemens Aktiengesellschaft
Stryjewski William
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