improved Joint DOX for Electric Cabi S.
Year: 1897

page_text: Date of Application, 19th Oct., 1897
Complete Specification Left, 19th Aug., 1898-Accepted, 24th Sept.,
1898
improved Joint DOX for Electric Cabi S.
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 boxes for enclosing the joints of electric cables and
particularly to the means whereby a water-tight closure is effected at the points
where the cable passes through the walls of the joint box, the object being to
allow of the joint being made in the cable and then to be lowered into position
in the box which is already placed in situ to receive it a water-tight joint then
being made around the cable at the end walls of the box. For this purpose the
box is cast with double end walls rising to the height of the centre line of the
cable and formed with half round recesses for the cable to lie in, the double end
walls being completed by a pair of plates united by transverse apertured vertical
webs adapted to fit between the side walls of the box and the inner plate to slide
between vertical guide ribs cast on the side walls, these removable end walls
being notched to fit over the cable and coinciding in position with the permanent
end walls so as together to enclose between them narrow end chambers extending
from bottom to top of the box when the removable end plates are dropped into
position over the cable when the joint has been made and the cable laid in
position in the box. This having been done, these chambers are filled up with
a bituminous or other suitable plastic compound which makes a perfectly water-
tight joint around the parts of the cable which traverse these end chambers and
between the walls of the chambers in which the said compound is filled, the body
of the box being also filled with a suitable insulating compound.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
Improved Joint Box for Electric 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 what may be termed straight-through disconnecting
joint boxes for enclosing the joints of electric cables and particularly to the
means whereby a water-tight closure is effected at the points where the cable
passes through the end walls of the joint box, the object being to allow the joint
to be made in the cable before the latter is placed in the joint box and then the
joint so made to be lowered into position in the box which is already placed in situ
to receive it, a water-tight closure then being made around the cable at the end
walls of the box.

page_text: The invention will be described with reference to the accompanying drawings
wherein Figure 1 is a longitudinal sectional elevation (on line 1-1 Figure 2) of
the joint box with the joint of the cable in position therein. Figure 2 is a plan
of the same, part of the cover being broken away to shew the interior.. Figure 3
is an end elevation and Figure 4 is a cross sectional elevation on line 4-4
Figure 2. The same letters of reference indicate the same parts in all the
figures.
For the purpose of this invention the box A is cast of U-section with double
end walls A¹ A2 rising to the height of the centre line of the cable C C and formed
with half round recesses a¹ a² for the cable to lie in, the double end walls being
completed by a pair of plates B1, B2, united by vertical cross webs b and adapted
to fit between the side walls of the box and to be there retained by vertical guide
ribs d¹, d², cast on the side walls and fitting between the plates B¹, B². These
removable end walls B1, B2, have half round recesses 61, 62, to fit over the cable
and together with the permanent end walls A1, A2, enclose between them narrow
end chambers D extending from bottom to top of the box these chambers being
only partially divided by the webs 6. The fid E of the box has a projecting
ribe which fits in a corresponding groove e¹ in the edges of the sides and ends of
the box and is secured by bolts passing through ears on the cover and body of the
box. The cable shewn has two concentric conductors c¹², and the joint is made
between the central conductors c¹ of the two parts, by thimbles f secured thereto
and connected by a bridge piece F and between the other two conductors 2 by
thimbles g and a bridge piece G. When the joint has been made, and the cable
laid in position in the box, the removable parts B1 B2, are dropped into position
over the cable and the chambers D are then filled up with a bituminous or other
suitable plastic compound (represented by the broken cross hatching in Figures 1
and 2) which being confined between the double end walls of the box makes a
perfectly water-tight joint around the parts C¹ of the cable which traverse these
end chambers. The body of the box may also be completely filled with oil or a
suitable insulating compound. The ends of the box also have outwardly project-
ing sockets H formed in halves, the one half in one with the permanent lower
part A¹ and the other half with the removable upper part 1 of the outer end wall,
these sockets being large enough to enclose the outer sheathing of the cable
and to receive around the latter a filling of the bituminous or other waterproof
composition.
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:-
1. The herein described improved joint box having double-walled ends formed
partly as removable parts connected by cross webs and fitting in guides, the per-
manent and removable double walled ends being recessed to embrace the cable
between them and enclosing chambers adapted to receive and retain a filling of
plastic compound so as to form a water-tight joint around the cable as specified.
2. In a joint box for electric cables the combination with double walled ends
formed partly removable and fitting around the cable which traverses the
chambers enclosed by such double walls, of fillings of bituminous or other water-
proof composition filled in, in the plastic state so as to make a water-tight joint
around the cable as described.
3. The herein described improved straight-through disconnecting joint box for
electric cables substantially as specified.
1000
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.