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Патент USA US2136238

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2,136,238
Patented Nov. 8, 1938
UNITED’ STATES PATENT ‘OFFICE
2,136,238
OVERHEAD CABLE INSTALLATIOlW
Frank w. Engster, Washington, D. 0., assignor m
General Electric Company, a' corporation of
New York
_
Application June 12, 1936, Serial No. 84.93%
5 Claims.
(Cl. 173-251)
The present invention relates to cable installa- - of the steel supporting wires and of the outer
soft metal wires as conductors maintained.
tions in which the cables are designed to be sup
For a consideration of what I believe to be novel
ported on poles or other structures in elevated
and my invention, attention is directed to the
positions. The type'of cable to which ‘my in
5 vention is directed is of the concentric type and accompanying description and the claims ap Cl
pended thereto.
comprises a central insulated conductor operat
In the drawing, which is illustrative of a con
ing at high potential surrounding which is a sec
ond conductor operating at ground potential so struction embodying my invention, Fig. 1 is a
that danger to life is eliminatedin the event view in side'elevation of a cable and its support
10 of accidental contact with the cable. The inner ing poles; Fig. 2 is a plan view of a pole with 10
conductor is made and insulated in the usual way. the supports for the cable and the tap for the
The outer conductor comprises alternate steel
and copper wires or their respective equivalents.
center conductor; Fig. 3 is an enlz rged bottom
plan view of a pair of cable supporting clamps
The steel wires primarily serve as a mechanical
and connectors; Fig. 4 is an enlarged view of one
form-of support; Fig. 5 is an end view of the 15
same; Fig. 6 is an. enlarged sectional view of the
cable, and Fig. 7 is a detail view of a splice lo
ll support and armor for the cable and the copper
or other wires to carry current at ground poten
tial although some current is or may be carried
by the steel wires. In the manufacture of the
cable, the steel wires are by external radial pres
20 sure caused to form seats in the softer wires and
in this manner a self supporting structure is
formed in which the wires are interlocked; Be
cause of the construction of the cable, certain
problems are present, to wit: Unless precautions
25 are taken in the way of special supports at the
poles, the insulation on the inner conductor, due
to the weight of the cable, is liable to be injured
due to compression pressure by the outer con
ductor. Such a cable also presents the problem
30 of gaining access to the center conductor for the
purpose of making taps for branch lines and of
maintaining the continuity of the outer soft wires
as a conveyor of current and also of the steel
wires as a mechanical support. A further prob
35 lem is that of preventing longitudinal pull on the
center wire, especially when it has to be cut to
make a tap or a splice. The problem is enhanced
by the fact that the center conductor at times
has to be tapped while current at high potential
is ?owing through it. When a tap has to be made
to a live conductor, it is in the language of the
industry referred to as a “hot tap”. Ordinarily
house wiring presents no particular problem in
this particular but it is quite a different thing
45 where the voltage of the center conductor is
cated between poles.
Referring first to Fig. 6, 1 indicates the cen
ter conductor which may be stranded or solid
as desired. Around the conductor is a body of
insulation t of any suitable material of which a
rubber or rubber-like compound may be consid
ered as an example. The outer conductor which
operates at ground potential comprises a large
number of round wires 9 made of hard drawn
steel having high tensile strength. Between or
interspersed with the steel wires are other wires
Ill initially of rectangular section made of softer
metal of which copper or aluminum may be con 30
sidered as examples. In the manufacture the
steel wires are spirally wrapped as in any ordi
nary cable but without any twist, the purpose
being to prevent them from spreading when a
transverse cut is made.
The soft wires on the
other hand are spirally wound and also twisted
so that they always stand radially with respect
to the axis of the center conductor. Because they
are soft, they do not tend to spread when cut.
After the hard and soft wires are laid up or spi
raled to form the cable, they are passed longi
tudinaily through a die means which reduces
the outside diameter to the proper size and also
causes the steel wires to form concave seats in
the sides of the soft wires. As a result, the cable
measured in thousands, as in the present case.
An object of my invention is the provision of
an improved means for securely supporting ca
is self supporting and the hard and soft wires
are interlocked which prevents them from sepa
ble of the character described without injury to
In Fig. l is shown a cable of the character
above described supported on poles ll. Because 50
of the strength of the cable due to the steel wires,
the poles may be widely spaced, as for example
by 300 feet. The cable shown is intended, but
without limitation thereto, to carry current at
2300 volts. ‘The outside diameter is .625. A per 55
50 the insulation on the inner conductor and at the
same time avoiding undue tensile strains in said
inner conductor.
A further object of my invention is the provi
sion of improved means whereby the center con
56 ductor can readily be tapped and the continuity
rating.
3
9,186,288
conductor and is afterwards covered with insula
porting wires and enclosing both sets of wires,
tion. In order to preserve the continuity of the
copper or conducting wires I. of the cable, a
Jumper 36 made of copper or other good conduct
ing material is provided. Its ends are carefully
united with the copper wires ii. For example, a
few turns of the wire of which the jumper is com
means connecting the clamps to the elevated sup
port in such manner as to relieve the portion
of thecenter conductor and of the conducting
wires located between said out ends of longitu
dinal pull, means for uniting the conducting wires
of the main cable with those of the branch cable,
posed may be wrapped around the cable and and a' connector for uniting the center conductor
of the main cable with that of the branch cable.
soldered, brazed or welded thereto.
What I claim as new and desire to secure by ‘
4. An overhead cable installation comprising 10
Letters Patent of the United States is:
elevated spaced supports, a main cable carried
1. A cable installation comprising elevated sup
by the supports, said cable terminating adjacent
ports, suspended main and branch concentric one of the supports and comprising an insulated
cables, each comprising an insulated central con
ductor and a surrounding conductor operating
at ground potential, the latter comprising sup
porting wires of high tensile strength and inter
spersed conducting wires, the said supporting
center conductor and an outer conductor com
prising bare wires of high tensile strength and 15
bare conducting wires, said wires being in inter
locking arrangement to form a self supporting
annulus, a 'tap cable of similar construction,
wires of the main cable being cut in the region
of a support, clamps secured to the adjacent
ends of the cut wires and to the supporting wires
of the branch cable, means connecting the clamps
of the main and branch cables to the support.in
clamping means in which the supporting bare
wires of the main cable and of the tap cable are 20
such manner as to prevent a longitudinal pull on
main and tap cable to a support, said clamping
means and devices relieving the insulated con 25
ductors of longitudinal strains, a means for elec
trically connecting the outer conductors of the
main and tap cables, and insulated means located
at one end of the main cablefor electrically con
necting the insulated center conductor thereof to
the center conductor thereof between the cut ends
of the supporting wires, and connectors electri
cally uniting the center conductor of the main
cable and the outer conducting wires thereof with
those of the branch cable respectively.
2. A cable installation comprising supports, a
main concentric cable having an insulated center
conductor and a surrounding bare conductor com
prising supporting wires of high tensile strength
and conducting wires, both operating at a po
tential lower than that of the center conductor,
the said supporting wires being cut adjacent one
of the supports, a clamp applied to the cut ends
of the supporting wires of the cable, means con
necting the clamps to the support to sustain the
weight and pull of the cables located on opposite
sides of the support, a branch concentric cable
similar in construction to the main cable, a con
nector electrically uniting the center conductor
of the main cable with that of the branch, means
for uniting the conducting wires of the main cable
with those of the branch, and means for sup
porting the branch cable.
'
3. An overhead cable installation comprising
elevated supports, suspended main and branch
cables, each comprising an insulated center con
ductor and a surrounding outer bare conduc
tor operating at a potential lower than that
of the insulated conductor, said outer conductor
comprising a set of supporting wires of high
tensile strength and a set of conducting wires,
the said supporting wires of the main cable being
cut in the region of a support, a clamp secured
toeachcableadjacentthecutendsofthesup
firmly anchored, said insulated‘ conductors ex
tending outwardly through the clamping means,
devices for securing the clamping means of the '
that of the tap cable.
,
5. An overhead cable installation comprising
elevated spaced supports. a main concentric cable
carried by the supports and comprising an in
sulated center conductor and an outer bare con
ductor surrounding the insulation of the center
conductor and comprising ‘bare wires of high
tensile strength and bare conducting wires of
lesser strength, said wires being interspaced in
interlocking arrangement to form a self support
ing annulus, a tap cable of similar construction,
the ends of the wires of high tensile strength of
both main and tap cables being exposed adjacent
a selected support, clamps in which the exposed
ends of the wires of high tensile strength are 45
firmly secured and through and beyond which
the ends of the conducting wires freely extend,
a means secured to the selected support and to
each of the clamps for sustaining the weight and
pull of the connected cables, connector means
independent oi’ the clamping means and located
between them in which the ends of the conduct
ing wires are coilectivelysecured, other connector
means also located between the clamps for uniting
the ends of the insulated center conductors, and
insulation for the last named connector means.
MW.ENGBTER.
Nov. 8,1938.
,
|_. K. HEbDmG
'
2,136,243
ELECTRICAL REGULATING APPARATUS FOR RECTIFIERS
Original Filed May 9, 1936
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