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Патент USA US2126290

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Aug- 9, 1938.
2,126,290 _
Filed Sept. ll, 1936
FIG. /
9, 1938
2,126,290 '
George A. Seelcy, Baltimore, Md., minor to
~Western Electric Company, Incorporated, New
York, N. Y., a corporation of New York
Application ‘September 11, 1936, Serial No. 100,211 _
3 Claims. (01. 173-265)
This invention relates to electrical cables and
more particularly to a coaxial cable in which one
conductor is substantially a hollow metallic cylin
der enclosing another metallic conductor of
smaller diameter spaced from and supported in
the cylinder by spacing members of insulating
It may be desirable in some instances, to lay up
two or more such coaxial conductor pairs in a
compound cable, either alone or with other con=
ductor units of other types. in such a case, the
coaxial units will be stranded or intertwisted to
gether, which may present some diitlculties be—
cause of the inherent torsional rigidity of the
cylindrical outer conductor of a coaxial pair.
Coaxial conductor pairs also are frequently
used to form an outgoing and return circuit for
an alternating electrical current oi high fre
quency. it is therefore particularly essential that
the inner surface of the outer conductor, which.
faces and is nearest to the inner conductor, shall
be smooth, continuous and free from irregularities
so far as may he.
Fig. 3 is a side view on a reduced scale of a por
tion of the pair after being twisted;
_ Fig. 4 is an end view thereof;
Fig. 5 is a plan view of a portion oi a tape to be
formed into an outer conductor, and
Fig. 6 is an end view thereot.
In the embodiment of the invention herein dis
closed, a coaxial conductor pair comprises an in»
ner or axial conductor to, a plurality of slotted
spacing disks it, it mounted on the inner con
doctor at intervals therealong, and a cylindrical
outer conductor 62 resting on the peripheries of
the disits M, ii to be supported on and spaced
‘from the inner conductor thereby. The inner
conductor herein disclosed is preferably a smooth
solid circularly cylindrical wire of copper, but
may be of other metal or of other form if desired,
e. g., a cylinder, a plurality of associated strands, .
or any other practicable form,
The dislgs ii, it
may be thought of as molded or formed or cut
from any suitable insulating material, e. g., artifi
cial resin, rubber, cellulose plastic, or the lilac and
may have any form suitable for the purpose.
Objects of the present invention are to "provide
a coaxial conductor pair which shall he simple in
outer conductor
such as copper,
(32 is a strip
or tape
structure, easy to manufacture,
or other appropriate conductive substance, stormed
relatively low
torsional rigidity at least in one direction of pns~
sible twist, and having an outer conductor in—
over the supported
of the the
it, itbeing
into in
hei'ently smooth ‘Within.
this instance of circular cross-section,
One embodiment of the invention contemplates
a coaxial
or axial
any suitahle
if desired it may in some cases be lfiOll-Cli‘?llllf
The strip is formed along both edges thereof '
spaced, integral, outwardly projecting teeth -,
it; These teeth M, iii are oil’set icy about the
thickness of the tape toward that side of the tape
which forms the outer surface of the cylindrical
outer conductor. The true edges is‘, it of the
heing a‘out'ted to form a seam l'l, the teeth ill
oi each edge overlie the other edge, so that the
teeth of each edge hold the other edge down.
5 and
if in 6,
teeth are cold
of the
tape shown
(as byinbeing
swedged while being cut with a punch and die,
cutting rolls, or the like), they may, in the process
of being formed into the cylindrical conductor, be
Other objects and features oi the invention will
appear from the following detailed description of
more or less deeply imbedded into the material
of the opposite edges, thus still more securely in~
one embodiment thereof taken in connection with
however, increases the torsional rigidity of the
formed conductor.
However in the embodiment herein disclosed,
it is desired to have the outer conductor torsionn
ally ?exible with respect to a speci?c amount of
hollow strand, or compound strand,_.with a plu—
rality of spacing members or‘ insulating material
thereon, and with an outer conductor of cylindri
cal form on the spacing members, the outer con
ductor being a strip or tape oi’ metal formed longi“
tudinally into a cylinder and having its edges
meeting and held in place by integral means one
terior to the cylinder, but preferably such as to
permit of longitudinal displacement or? the abut
ted edges of the tape relatively to each other,
while preventing any radial displacement of the
the accompanying drawing in which the same
50 reference numerals are applied to identical parts
in the several figures and in which
Fig. l is a broken view in side elevation of a
part of a coaxial conductor pair constructed in
accordance with the invention;
Fig. 2 is an end view thereoi;
terloching the edges along the seam ll, which .
left hand twist, and laterally ?exible after being
Hence the teeth is, M are so procur
tioned and so disposed relatively to each other "
iii, Ii 53, ‘ii iii)
that when the conductor is ?rst formed as shown
in Figs. 1 and 2,v with the seam ll‘ ‘distrust-{ii along
a straight geometrical element oi” the cylindrical.
of the conductor,
abutted laterally
each tooth
one against
one corresponding tooth or the other edge, the
oil?‘ edge l5 being Just to the left
‘those of c
seen in Fig. 1. These abil'tted palm
corresponding teeth are further spaced apart
along the seam I].
‘When the conductor pair is now twisted, as
for example in being laid up with one or more
' iiinr pairs in a compoundv cable, the edges iii
to slide along each other and the teeth who
lions such as shown in Figs. 3
d d, as the
ill I‘! is changed from a straight he to a heliii.
\ is the teeth may be distributed at substantially
intervals along the helical seam oi? the
.ed unit.
some instances, the teeth may preferably be
ight toseam.
at spaced
unit may
then be
doctor theronrcnod and comprismg a metal tape
other edge, the widths of the
spaces between consecutive projections on either
greater than the widths oil the pro»
jectiono on the other edge and ‘the projections on
either edge overlapping the other edge between
consecutive projections oi’ ‘the other edge, ‘the
parts being so proportioned and arranged that
when the conductor pair is twisted each edge
and its projections
free to slide along the
other edge to provide torsional ?exibility, while
the seam cannot open. radially.
2. In a coaxial conductor pair the combination
with an axial conductor and spacing members
thereon oi’ an outer hollow conductor therecround
and comprising a metal ‘tape iformed into a tube
with the edges
the tape abutteci together to .
form a seam, each edge of.’ the tape having pro~
ei "her way;
Furthermore ii’ the pair is not to be twisted, but
it is desired to have the seam helical, the tape
jecticns thereon overlying the outer side oi" the
other abutting edge, the widths of the spaces
between consecutive projections on either edge
being greater than the widths of the projections
may be wrapped spirally instead of being formed
on ‘the other edge and the projections on either "
longitudinally over the disks 'l I, H, in which
case the teeth of the tape will ‘be original]
edge overlapping the other edge between con
secutive projections of the other edge, the parts
being so proportioned and arranged that when
the conductor pair is twisted each edge and its 30
projections are free to slide along the other edge
to provide torsional ?exibility, while the seam
cannot open radially.
3. In a coaxial conductor pair the combination
located to fall as shown in Fig. 3.
A cable as shown in Fig. 3, or comprising units
such as shown in Fig. 3, will have much greater
?exibility both in torsion and in nexure than an
analogous structure with the edges of the tape
welded, soldered or immovably interlocked, yet
neither edge can lift above the other radially to
produce any internal ridge or protuberance to
harm the desired electrical properties of the pair.
It will be clear that the embodiment of the
invention herein disclosed is only illustrative and
(if) may be modi?ed and departed from in many ways
without departing from :the spirit and scope of
the invention as pointed out in and limited solely
by the appended claims.
What is claimed is:
1. In a coaxial conductor pair the combination
with an axial conductor otvan outer hollow con
with an axial conductor and spacing members
thereon of an outer hollow conductor therearound
and comprising a metal tape formed into a tube
with the edges of the tape abutted together to
form a seam, each edge or the tape having pro
jections thereon overlying and slidable on the
‘outer side of the other edge, so that when the
conductor pair is twisted each edge and its pro
jections are free to slide along the edge to provide
torsional ?exibility, while the seam cannot open
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