Improved Joint Box for Coupling Underground and Aerial Electrical Cables.
Year: 1897

page_text: Date of Application, 19th Oct., 1897
C
1040
سم
4000
PROVISIONAL SPECIFICATION.
Improved Joint Box for Coupling Underground and Aerial
Electrical Cables.
We, ROBERT JAMES HATTON, Engineer, and W. T. HENLEY'S TELEGRAPH
WORKS COMPANY LIMITED, both of 27, Martin's Lane, Cannon Street, in the City
of London, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved joint box for the coupling of under-
ground with aerial electrical cables and has for its object to ensure perfect insula-
tion for the connections between an underground cable consisting of one or more
conductors, and the corresponding wires of an aerial system; to enable the con-
nections to be easily made above ground in an easily accessible position; and
to protect them against the weather. The joint box is adapted to be bolted to a
post or other support and the bottom of the box is provided with an opening
for the passage of the underground cables fitted with a water-tight packing and
gland through which the cables, having had the ends prepared and thimbles
soldered on, are passed upwards into the box and secured by the gland and pack-
ing. The insulation of each bare conductor leading to the overhead wires is pro-
vided for by passing it up axially through a double shed insulator firmly cemented
or otherwise secured in the bottom of the box. The end of the bare conductor
having been soldered to its thimble, is secured by a bolt and nut to the thimble
on the cable. When all the connections are made the box is to be filled up with
paraffin wax or other suitable insulating compound. The sides of the box are
continued downwards below the bottom in the form of an outwardly inclined'
curtain so as to throw off rain and afford protection to the insulator against the
weather.
Improved Joint Box for Coupling Underground and Aerial
Electrical Cables.
We, ROBERT JAMES HATTON, Engineer, and W. T. HENLEY'S TELEGRAPH
WORKS COMPANY LIMITED, both of 27, Martin's Lane, Cannon Street, in the City
of London, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:-
-
This invention relates to an improved joint box for the coupling of under-
ground with aerial electrical cables and has for its object to ensure perfect insula-

page_text: tion for the connections between an underground cable consisting of one or more
conductors, and the corresponding wires of an aerial system; to enable the con-
nections to be easily made above ground in an easily accessible position; and
to protect them against the weather.
The invention will be described with reference to the accompanying drawings
forming part of this specification wherein Figure 1 is a sectional elevation and
Figure 2 a plan (with the cover removed) shewing the connection of a three-core
underground cable, with three aerial wires. Figure 3 is a sectional elevation on
line 3-3 Figure 4, which is a plan (with the cover removed) shewing the con-
nection of the two conductors of a double concentric cable with two aerial lines.
The same reference letters indicate the same parts in corresponding figures.
The joint box A is provided with lugs a whereby it is adapted to be bolted to
a post or other support and the bottom A¹ of the box is provided with an opening B
for the passage upwards into the box of the end of the underground cables C C¹, C²,
said opening being fitted with a water-tight packing b and gland 6 through
which the cables, having had the ends prepared are passed upwards into the box
and secured by the gland b¹ and packing b which fits tightly around the outer
covering of the cable. The insulation of each bare conductor I) leading to the
overhead wires is provided for by passing it up axially through a double shed
insulator E firmly cemented or otherwise secured in a suitable seat in the bottom
of the box. The ends of the bare conductors D having been soldered to their
thimbles are secured each by a bolt c¹ and nut d¹ to the thimble c on the corre-
sponding conductor of the cable. When all the connections are made, the box is
to be heated and filled up with paraffin wax or other suitable insulating com-
pound. The sides of the box are continued downwards below the bottom in
the form of an outwardly inclined curtain F extending lower down than the
insulator E so as to throw off rain and afford protection to the insulator against
the weather.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
The herein described arrangements of joint box having insulators fitted therein,
the box being adapted to receive the ends of the underground cables and aerial
wires and to enclose and insulate the joints so as to enable the connections to bo
made above ground in an accessible position and to be thoroughly insulated and
protected as described.