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Патент USA US2122118

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Patented June 28, 1938
Ernst Studt, Nordenham, Oldenburg, Germany,
~ assignor to Norddeutsche Seekabelwerke Ak
tiengesellschaft, Nordenham, Oldenburg, Ger
Original application October 11, 1933, Serial No.
693,215. Divided and this application Septem
ber 29, 1936, Serial No. 103,208. In Germany
October 24, 1932
1 claim.
(C1. 173-268)
This forms a division of the copending appli
cation Serial No. 693,215 ñled October 11, 1933
for “Submarine cables”, now Patent No. 2,059,055,
October 27, 1936.
This invention relates to an improved joint in
the insulation of submarine cables which are in
sulated with guttapercha or guttapercha-like
materials. The making of such joints in the in
sulation is one of the most difficult problems in
10 the manufacture of submarine cables. While
in the case of guttapercha cables the joints may
be made by skilled operators by hand, it was
necessary for the jointing of “Paragutta” cores
to work out a special method and to design a
15 special machine in order to obtain perfect ad
hesion of the surfaces overlapping one another,
Hitherto it has not been possible to make per
iectly satisfactory joints in “Paragutta” cores by
hand. “Paragutta” as deñned on page 198 of
20 “Beil System Technical Journal” of April 1932,
:is a mixture of rubber from which the albumen
has been removed, deresinated balata and wax.
New it has been found that a perfectly satis
iaetory joint can be made in the insulation of
25 “Paragutta” cores without special devices by us
ing as the jointing material a mixture of gutte
pereha, balata or the like with polystyrol or other
polymerization* products of aryl olefines.
adhering and adhesive power of a mixture of for
instance 85% of deresinated balata with 15%'of
‘ polystyrol is so great that in all circumstances a
perfectly satisfactory and watertight joint Will be
formed in the case of “Paragutta” cores. If it
should be thought necessary to increase the per
centage of polystyrol in the mixture in order still
further to increase the adhesive power, wax,
caoutchouc or some other softening agent should
be added to the mixture, as otherwise the total 10
mixture will become too hard.
The employment oi’ the above-mentioned mix
tures also provides advantages when making
joints in guttapercha cores, as these mixtures are
easier to handle than guttapercha alone.
The invention is exemplified in the drawing at
tached hereto showing a conductor core sur
rounded by cable insulation and an outer sleeve
oi’ thermoplastic substance.
What I claim is:
A joint in theA insulation of cables which are
insulated by a thermoplastic substance consist
ing of a mixture of albumin free rubber, deresi
_ nated balata and wax, in which the jointing ma
terial for the insulation consists of a mixture of
guttapercha with polystyrol.
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