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Патент USA US2409532

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"Oct. 15, 1946.
2,409,530
C. E.-BENNETT
ELECTRIC CABLE
Filed July 3, 1942‘
_
v
>M‘6,
INVENTOR
BY
ATTORNEY
Patented Oct. 15, 1946
. 2,409,530‘
UNITED STATES PATENT OFFICE
2,409,530
ELECTRIC CABLE
Charles E. Bennett, Ridgewood, N. J ., assignor to
The Okonite Company, Passaic, N. J., a corpo
ration of New Jersey
Application July 3, 1942, Serial No. 449,575
1 Claim.
(Cl. 174-115)
1
This invention relates to an improvement in
electric cables, more particularly to cables for
low tension work, and has for one of its objects
the provision of such a cable which is of new
and novel construction and is adapted for use in
substitution of the usual BX cable.
In the accompanying drawing illustrating one
embodiment of the invention:
Fig. 1 is a part sectional elevational view of
a cable constructed in accordance with the in
vention; and
Fig. 2 is a section on the line 2-2 of Fig. 1.
Referring to the drawing in detail: 2 desig
2
with heated terpin hydrate or an equivalent ma
terial which is capable of rendering the paper
highly. moisture resistant. The addition of for
ti?ers such as cuprous stearate, zinc stearate,
etc., to the terpin hydrate before impregnating
the paper further enhances the Waterproofness
of the armor. This treatment too increases the
tensile strength, ?exural strength, compressional
strength, etc, of the armor.
It will be appreciated from all of the foregoing
that my cable, as above described, is of improved
construction as compared with existing so-called
BX cable. Owing to the fact that the insulated
conductor 2 and naked conductor 6 are en
nates one of the conductors of the cable insu
lated with paper 4. The insulation 4 is in the 15 closed in the highly waterproof sheath 8, the
form of a paper tape, applied spirally about the
cable is adapted for installation in wet areas
conductor. In the usual BX cable it is quite
where the ordinary BX cable is not permitted.
usual to employ rubber insulation which is built
It will be appreciated also that where treated
up to a wall thickness of as high as 31 mils.
paper armor is employed instead of metal BX
Owing to the improved construction of the cable
I obtain a reduction in weight without sacri?ce,
of this invention, the wall thickness of the paper
however, of ?exural and compressional strength.
insulation 4 is only about 10 mils.
It is to be understood that changes may be
Extending along the cable on the outside of
made in the details of construction and arrange
the insulation 4 is a bare copper conductor 6.
ment of parts herein illustrated and described
About the conductor assembly thus provided 25 without departing from the spirit and scope of
I apply an electrically insulating waterproof,
my invention.
.
non-metallic sheath 8. This sheath 8 may be
What I ‘claim is:
composed of rubber or it may be composed of
An electric cable comprising in combination
a rubber-like material such as polyethylene tet
a paper insulated conductor, a bare conductor,
rasul?de, a synthetic material known commer 30 an enclosing polyethylene tetrasul?de sheath,
cially as Thiokol.
and an armor of paper impregnated with terpin
While the cable may be armored with metallic
hydrate.
armor, such as commercial BX, I may employ an
CHARLES E. BENNETT.
armor ID of paper. This paper is impregnated
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