Apparatus for manufacturing an optical fiber cable

Details Apparatus for manufacturing an optical fiber cable Apparatus for manufacturing an optical fiber cable

1999-06-04

2001-05-01

Wellington, A. L. (Department: 3722)

Metal working

Plural diverse manufacturing apparatus including means for...

Binding or covering and cutting

C228S017500, C228S042000, C228S148000

Reexamination Certificate

active

06223407

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to an apparatus for manufacturing an optical fiber cable.
DE-A-44 34 133 discloses an apparatus for manufacturing an optical fiber cable comprising a supply coil from which a metal strip is drawn off, a forming apparatus for forming the metal strip into a tube, a welding device for closing the longitudinal slit of the metal tube, and at least one supply coil from which an optical fiber is drawn off and inserted into the still open metal tube. To protect the optical fiber(s) against mechanical and thermal influences, they are inserted into a small tube that projects into the slit tube and ends behind the weld point to release the optical fibers.
To make the optical fiber cable longitudinally watertight and to protect the optical fibers located within the metal tube against mechanical influences, the interior of the metal tube is filled with a viscous plastic mass. Petroleum jelly is typically used for this purpose.
The petroleum jelly is introduced into the cable by an additional tube that encloses the tube carrying the optical fiber. The petroleum jelly is piped into the metal tube under pressure through the annular gap between the tubes.
SUMMARY OF THE INVENTION
The object of the present invention is to improve the known apparatus so as to prevent any influence on the optical fibers or the filler mass in the area of the weld point. The apparatus for manufacturing an optical fiber cable including a metal tube in which optical fibers are arranged in a viscous plastic mass, according to the present invention, includes a device for continuously forming a metal strip into a slit tube, a welding device, and a charging tool with at least an outer tube whose one end projects into the slit tube, whereby the outer tube introduces the optical fibers into the metal tube, the outer tube having an indentation on its surface facing the welding device which is covered at the top using a cover, a channel being formed between the cover and the outer tube, and a coolant gas or protective gas is directed through the channel.


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