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Патент USA US2116267

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May 3, 1938.
F_ KUMMER
.
CONDUCTOR WITH AIR SPACE INSULATION
Filed Nov. 15, 1935
17
19
2,116,267
2,116,267
Patented May 3, 1938
UNiTED STATES,
PATENT OFFICE -
2,116,267
CONDUCTOR WITH AIR, SPACE INSULATION
Franz Klimmer,v Bérlin-Oberschoneweide, Ger
many, assignor to Felten & Guilleaume Carls
werk Actien-Gesellschaft, Colome-Mulheim,
Germany
Application November 15, 1935, Serial, No. 50,034
In Germany November 15, 1934
5 Claims.» (01. 173-265)
For the transmission oi‘ high frequencies use is
made of coaxial conductors which, for the purpose
of obtaining as small a capacity as possible be
tween the conductors, are provided with an air
space insulation.
The capacity is reduced in proportion with the
amount of insulating material employed and in
proportion with the. dielectric constant ofv'the in
sulating material. Naturally, the economy in in
'If it is desired further to ensure that the helix
will not be displaced on the conductor, after the
helix has been provided thereon itmay be secured
by means of a thread provided thereon and laid in
10 sulating material must not be carried so far that
the mechanical strength is thereby affected. In
order to avoid large losses the angle of loss of the
insulating material must be small.
insertion consisting .of a thin thread capable of
resisting tensional stress. This insertion has the
further advantage that in the case of breakage
the helix does not. unwind‘itself but=remains in
its predetermined position on the conductor.
,
The object of the invention is to construct such
15 a cable in such a manner that whilst the capacity
is as small as possible the required mechanical
strength is ensured to a high degree.
According to the invention, the conductors are _
separated from one another by a holder consisting
20 of a helix or helices which is or are self-sustain
ing, being made of an insulating material capable
oi retaining the helical shape, the said helix or
helices being "hollow and open”. The latter ex
pression is tobe understood as defining a helix the
25 interior ‘or which is not ?lled by another material
and the turns of which do not touch each other
.but leave an air gap between them. ,
an opposite'direction. This thread also assists in 10
holding the helix on‘the conductor.
'
Various forms of carrying the invention into
e?ect are illustrated, by way of example, in the
accompanying drawing.
‘ Figure 1 illustrates in elevation and Figure 1a ll
in cross-section a cable with a concentric arrange
ment of the conductors and-having a number or
helices parallel to the axis.
‘Figure 2 illustrates in cross-section a cable with
a plurality of conductors ‘and- a plurality oi’ helices 20
. Figure 3 illustrates a cable with concentric ar
rangement of conductors and a distance holder
in the form of a helix which is helically arranged.
Figure 4 ‘illustrates a helically arranged helix
having inserted therein a thread‘canable of re 25
sisting tensional stresses.
.
'
Figure 5 illustrates an arrangement in which
the hellxis secured on the conductor by means
The said hollow and open helices may be either 1 of a thread capable of resisting tensional stresses.
parallel to the axis of the conductor or in their
Referring to Figures 1 and la, l is the inner
‘0 turn surround the inner conductor in helical lines. conductor, 3 the outer conductor and 2 are heli
In this way the advantage is attained that a cal threads of insulating material provided ‘be
very small amount of insulating material is em
the said two conductors, The axes of the.
ployed to secure a large air-space insulation, tween
helices run parallel to the axis of the conductor.
whilst at the same time great mechanical
. Figure 2 shows in cross-section an arrangement
35 strength is attained. Moreover,» a cable con ‘having a number of coaxial conductors. The
structed in this manner isvery ?exible and the middle conducting layers 5 and 6 are separated
helices are stressed only with respect to torsion. from the inner conducting layer 4 and the outer
A iurther advantage of the construction ac
conducting layer '1, as well as from one another
w cording to the present invention consists in the by hollow and open helices of insulating mate
easy manner of manufacture of such cables. The
8.
individual elements of the cable may be simply rial
In the‘construction illustrated in Figure 3 the
bundled together and surrounded by the outer hollow and open helix I0 is in its turn so ar
cover it their axes are to run parallel or they may
ranged as to-run helically around a conductor 9,
‘5 be stranded together in a known manner and then 'being surrounded by the coaxial conductor i I.
be surrounded by the outer cover. '
Figure 4 illustrates a conductor in which the
Polystyrol has been found a suitable insulating helix acting as a distance member is providedwith
material since it has a small dielectric constant, a a thread capable of resisting tensional stresses.
small angle of loss, great mechanical strength,
. 3 more particularly with respect to torsion, and can
easily be shaped.
In order that the distance between two succes
, sive turns of the helix shall remain the same at
all points during the manufacture of the cable,
was» may be made of a helix which contains an
9
80
35
~
40
45
i2 is the storage reel of the helix it which is pro
vided with the said tension resisting thread it, 50
the conductor [5 being wound with the said helix
from the storage reel l2.
'
Figure 5 illustrates a cable in which the con
ductor' I. is surrounded by an insulating hollow
and open helix I‘! provided with a tension resist
2
2,116,267
ing thread It, which is held on the conductor by
means of a thread I9. ' A winding 20, which may
helically arranged between the said "two con
ductors.'
consist of‘?exible bands of polystyrol, is provided
thereon. The outer conductor 2|, consisting of
3. In air space insulated high frequency con-'
ductors comprising an inner conductor and an
an individual number of copper bands, may be
outer surrounding conductor, a distance holder 5
between the said two conductors consisting of a
against induction 22, consisting of magnetizable 7 self-sustaining hollow and open helix of an insu
further‘ provided with a protecting covering
material.
,
Thematerial of the threads I! and I9 'must be
1. such as to be capable of resisting tensional
stresses; preferably, use is made for this purpose
of insulated material having fa small dielectric
loss, such as for instance polysty_ 01. The threads
ll used should be as thin as possible in order to re
duce the proportion of the air in the conductor
insulation as much as possible,
What I claim is:
1. In air space insulated high frequency con
ductors comprising an inner conductor and an
7 outer surrounding conductor, a distance holder
between the said two conductors consisting of a
self~sustaining hollow and open helix of an insu
lating material capable of retaining the helical
shape the said two conductors lying outside the
said helix.‘
“
2. In air space insulated high frequency con
ductors comprising an inner conductor and an
outer surrounding conductor, a distance holder
between the said two conductors consisting of a
self-sustaining hollow and open helix of an insu-.
lating material capable of retaining the helical
shape, which self-sustaining helix is in its turn
lating material capable of retaining the helical
shape the said two conductors lying outside the
said helix and a thin thread capable of resisting 10
tensional stresses lying in the said self-sustaining
helix for the purpose of taking up the tension to
getherwith the self-sustaining helix.
4. In air space insulated high frequency con
ductors comprising an inner conductor and an 16
outer surrounding conductor, a distance holder
between the said two conductors consisting of a
self-sustaining hollow and open helix of an in
sulating material capableof retaining the helical
shape the said two conductors lying outside the 20
said helix and a thread laid on the inner con
ductor in opposite direction to the said helix for
holding the latter in position on the inner con
ductor.
‘
5. In air space insulated high frequency con 25
ductors comprising an inner conductor and an
outer surrounding conductor, a distance holder
between the said two conductors consisting of a
self-sustaining hollow and open helix of polysty
rol which is capable of retaining the helical shape 30
the said two conductors lying outside the said
helix.
FRANZ KLIMMER.
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