IL47973A - Plant for making watertight telecommunication cables - Google Patents

Description

Flant for making watertight elecommunication cables This invention relates to a plant for making watertight tele- coranunicatlon cables which comprise synthetic resin insulated veins with the cavities in the core of/the cable being filled with water repellent means* such as vaseline, in which plant the filling equipment containing the heated filler is positioned between a heating zone and a cooling zone* Such arrangements are known and are described e.g. in the German/DOS 2,051,672.

It is an object of this invention to simplify the construction of such a plant by eliminating the need for an evacuation equipment* A further object of the invention is to provide a construction which ensures cleanliness of''the equipment, which in the known constructions could not be attained, due to oozing of the filling mass from the nipples connecting /the filling equipment with the cable core* Finally, i is an object of the invention to provide a construction which held under pressure in such chambers in two oppositely rotating flows which act onto the cable core by spreading it open, filling it up s turbulent flow.* So that the filling mass would not exit from the chambers without attaining a complete fill up of the core cavities* there are provided pressure valves in the conduits leading from a storage container to the chambers*' Furthermore* for, the sake of keeping the equipment clean, pressure equalizing chambers are provided in the heating - and in the cooling zone* preventing the oozing of filling mass from the nipples establishing connection with the core* The pressure equalizing chambers are preferably provided with a receiving funnel from which surplus fille mass is recirculated Into the storage container* Thus due to the equalization of pressure no filler mass can ooze from the nipples.

The invention will now be described with reference to the annexed drawings which illustrate the invention in a schematlcal way* Fig.11 is a schematical elevational view of a plant according to the invention* Fig.* 2 shows details* In Pig* 1 the numerals 1 end 2 indicate tube shaped chambers which serve the filling of the core with a tightening mass* Details of these chambers are shown in Fig** 2* The inlet and outlet connections to and ft;om these chambers are provided at the same level and staggered in relation to one another. The filler mass is under pressure produced by pumps 6 referred to later* and forms two oppositely rotating flows which fully fill all core cavities and evacuate air from the core.* Thus no specific evacuation equipment is needed*· The filler mass entering the chambers 1 and 2 forms two oppositely rotating flows* due to the fact that the mass enters the chambers in opposite senses* Into chamber 1 the mass enters through the rear connection 11 and leaves through a frontal connection 10. At chamber 2 this order is reversed - entrance thouh 11 n exit u To control the pressure in the chambers 1 and 2* pressure valves 9 in the lead off conduits 10 are provided** The filler mass is fed into chambers 1 and 2 by means of pressure pumps 8 and conduits 11·' The numeral 7 indicates a heated storage container for the filling mass* Spigots 12 lead into the containe 7 from funnels 6 which surround β pressure equalization chamber 5* The latter prevents filler mass from entering the ends of heating zone 3 and cooling zone 4* The numeral 13 designates the inlet and outlet nipples of these chambers*' Means for heating and cooling are of a conventional kind and need not be described* Thus for heating hot water or steam may be employed while for cooling cold water is used. To. this end the tubes through which the cable core is drawn* are enclosed by wider tubes in which the heatings and the cooling agents respectively circulate.! The filling conduits 14 (Fig.i 2) which lead from the equalizing chambers 5 to chambers 1 and 2 are provided with inlet and outlet nipplee 15 the bored of which are of such width that some ller mass can' pass out along the cable core* Thereby the ingress of air is prevented at the entrance of the core and both at entrance and exit of the core the latter is properly cushioned avoiding squeezing of the core and pressing out of filler mass from the filled cable core** The new equipment functions as follows: The cable core enters at the left hand side (of Fig. 1) of the plant through inlet nipple 13 into filler tube 14. Within the range of the heating zone 1 the core-r is preheated* This is attained irst by heated and rearwardly flowing filler mass (about 60*C) and secondly by a heating agent which circulates in a tube surrounding the filler tube 14.< The heating agent preferably is water or oil* The heating has the effect of preventing a premature cooling by an entering cold core of the filler mass in chambers 1 and 2 which could result in partly solidifying of the mass and insuf icient filling' of the core*1 The filling itself occurs in chambers 1 and 2» where the mass penetrates into the core* To this end the mass is conveyed by pressure pumps 8 from the container 7 into chambers 1 and 2·' Here, as explained above, two oppositely directed flows are created* The flow in chamber 1 is directed towards the cable core in such a manner that it spreads its strands apart so that the mass can fully penetrate into the core* The effect is even Improved by cross vanes, as shown in Fig*] 2, which cause turbulence of the flow.1 The chambers 1 and 2 are in conmunlcation with the filler tube 14 (Fig. 2). The mass which penetrates into the core does also enter the filler tube in both directions and fills the latter* so that the core is enveloped all along by the filler mass which is under pressure*' Surplus filler mass passes out from the filler tube through the nipple :and via chambers 5 flows back into the storage container 7.

The core fully filled and fully enveloped by the mass now enters the cooling zone 4 in which the tube 14 passes through a cooling pipe and where it is cooled* After leaving the right hand nipple 13, the cable core is sheathed and treated in the conventional way* It will be seen that the new arrangement supplies a cable core which internally and externally is fully filled and enveloped*

Claims (4)

WHAT IS CLAIMED IS:

1. An equipment for making watertight telecommunication cables which comprise synthetic resin insulated veins with the cavities in the core of the cable being filled with water repellent means* such as vaseline* in which plant the filling equipment containing the heated filler is positioned between a heating zone and a cooling zone > characterised thereby that the filling plant comprises two or aore tube-shaped j chambers which are separate from one another, the filling mass being held under pressure in sfcch chambers In two oppositely rotating flows which act onto the cable core by spreading it open* filling it up and simultaneously evacuating air therefrom together with probable surplus of flller.i / /

2. · The equipment claimed in Claim 1, characterised thereby that within the said chamber* there are provided crosswise extending vanes adapted to produce turbulent £low of the entering filler mass*

3. The equipment claimed in Claims 1 and 2» characterised thereby that in the conduits leading from the said chambers* Intermediate the chembers an /a storage tank there are provided pressure vales ,,(9).'

4. The equipment claimed in Claims 1-3* characterised thereby that in the heating zone (3) and in the cooling zone (4) pressure equalizing chambers (5) are provided*' 5 Equipment as claimed In Claim 4 characterised thereby that pressure equalising chambers (5) have a receiving funnel (6) from which surplus filler mass can be re-fed into the storage ak*' 6· An equipment for making watertight telecommunication cables substantially as hereinbefore described with reference to. and as Illustrated in the accompanying drawings* COHEN ZEDEK 6 SPISBACH P.O. BOX 33116» TEL AVIV., ATTORNEYS FOR APPLICANT